Validate documentation roadmap completion

README.md

@@ -1,13 +1,20 @@
 # distributor
 
-`distributor` validates manifested report bundles and publishes selected source or generated artifacts to configured destinations.
+`distributor` validates manifested report bundles, plans destination updates, and publishes selected source files or generated HTML outputs to configured destinations.
 
-It is currently a local-first CLI: source bundles are read from local storage, destinations are local directories, and Markdown files can be rendered to HTML sidecars.
+It is a local-first Go CLI for report distribution. A pipeline reads one source bundle tree, validates `manifest.json`, fans out to one or more local, SSH/SFTP, or S3-compatible destinations, records destination state in `.distributor.json`, and can also accept authenticated tar or tar.gz uploads through the HTTP upload server.
 
-Run the local example pipeline:
+Run the maintained local example:
 
 ```sh
 go run ./cmd/distributor run --config examples/local-publish.yml
 ```
 
-See [docs/cli.md](docs/cli.md), [docs/config.md](docs/config.md), [docs/operations.md](docs/operations.md), and [docs/troubleshooting.md](docs/troubleshooting.md) for the implemented CLI, configuration, operating notes, and common failure modes. Planning material lives under `docs/roadmap/`.
+Go producers can use `gitea.maximumdirect.net/eric/distributor/pkg/bundle` to build, write, parse, and validate local source bundles with the same manifest contract used by the CLI. See [Source bundle contract](docs/integrations/source-bundle.md).
+
+- [CLI reference](docs/cli.md)
+- [Configuration reference](docs/config.md)
+- [Operations guide](docs/operations.md)
+- [Troubleshooting](docs/troubleshooting.md)
+- [Integration contracts](docs/integrations/source-bundle.md)
+- [Development architecture](docs/policy/architecture.md)

docs/cli.md

@@ -1,99 +1,222 @@
 # Distributor CLI
 
-## Shortest useful command
+Audience: operators, integrators, and developers who run `distributor` from a shell or automation.
+
+This document is the canonical command and flag reference. Configuration schema details live in [Configuration](config.md), operational recovery guidance lives in [Operations](operations.md), failure diagnosis lives in [Troubleshooting](troubleshooting.md), and external contracts live under [Integrations](integrations/source-bundle.md).
+
+## Shortest Useful Command
+
+Run the maintained local publishing example from the repository root:
 
 ```sh
 go run ./cmd/distributor run --config examples/local-publish.yml
 ```
 
-This discovers the example source bundle and publishes source files to `workspace/published/source-bundle`.
+The example reads `examples/source-bundle/manifest.json`, publishes the configured files into `workspace/published/source-bundle`, and writes destination state metadata beside the published output.
 
-## Command overview
+## Command Overview
 
-```sh
+```text
 distributor [--help]
-distributor version
-distributor run [--config <path>] [--dry-run]
-distributor validate <path>
-distributor inspect <path>
+distributor help
+distributor version [--format text|json]
+distributor run [--config <path>] [--dry-run] [--force] [--format text|json]
+distributor serve [--config <path>]
+distributor validate [--format text|json] <path>
+distributor validate --config <path> --pipeline <id> [--bundle <path>] [--format text|json]
+distributor inspect [--format text|json] <path>
+distributor inspect --config <path> --pipeline <id> [--bundle <path>] [--format text|json]
+distributor manifest
+distributor manifest create <bundle-path> --id <bundle-id> [options]
+distributor manifest create --id <bundle-id> [options] <bundle-path>
 ```
 
-- `version`: prints the application name and version. Development builds print `distributor dev`.
-- `run`: loads a YAML config, discovers local source bundles, plans each configured destination, writes selected outputs unless `--dry-run` is set, and prints a final status summary.
-- `validate`: validates a local source bundle directory or a local tree containing source bundles.
-- `inspect`: validates local source bundles and prints normalized bundle metadata.
+- `version` prints the application name and version.
+- `run` executes configured pipelines against their destinations.
+- `serve` starts the authenticated HTTP upload API defined by the configuration file.
+- `validate` checks a local bundle path or a configured source bundle.
+- `inspect` reports manifest and file metadata for a local bundle path or a configured source bundle.
+- `manifest create` writes a `manifest.json` file for an existing bundle directory.
 
-`validate` and `inspect` accept local paths only. `run` currently executes local backends only. SSH and S3 config can be parsed and validated, but configured SSH or S3 execution fails with a clear unsupported-execution error.
+## Flag Reference
 
-## Flag reference
+### Help
 
-Root command:
+`distributor`, `distributor --help`, `distributor -h`, `distributor help`, and `distributor manifest` print command help. Unknown commands and invalid argument combinations print usage guidance and exit non-zero.
 
-- `--help`, `-h`, or `help`: print root help.
+### Common Output Format
 
-All subcommands:
+`--format text|json` is supported by `version`, `run`, `validate`, `inspect`, and `manifest create`.
 
-- `--help`, `-h`: print command-specific help.
+- `text` is the default human-readable output.
+- `json` emits one JSON document for successful command execution.
+- Invalid formats are rejected before command execution.
 
-`run` flags:
+### `version`
 
-- `--config <path>`: config file to load. If omitted, `run` uses `/usr/local/etc/distributor/config.yml`.
-- `--dry-run`: load config, discover bundles, inspect destination state, print planned actions and final status, and do not write files.
+```sh
+distributor version [--format text|json]
+```
 
-`run` does not accept positional arguments. `validate` and `inspect` accept at most one path; omitting the path returns a required-path error.
+`version` accepts no positional arguments. Text output prints the application name and version; JSON output includes `application` and `version` fields.
 
-## Common workflows
+### `run`
 
-Validate a source bundle:
+```sh
+distributor run [--config <path>] [--dry-run] [--force] [--format text|json]
+```
+
+- `--config <path>` loads the pipeline configuration. If omitted, the application uses `/usr/local/etc/distributor/config.yml`.
+- `--dry-run` validates inputs and reports destination actions without applying changes.
+- `--force` permits a run when destination state indicates a conservative safety check would otherwise block it.
+- `--format text|json` selects human-readable or machine-readable output.
+
+`run` accepts no positional arguments.
+
+### `serve`
+
+```sh
+distributor serve [--config <path>]
+```
+
+- `--config <path>` loads HTTP, source, destination, and pipeline configuration. If omitted, the application uses `/usr/local/etc/distributor/config.yml`.
+
+`serve` accepts no positional arguments and runs until interrupted or until the server exits with an error.
+
+### `validate`
+
+```sh
+distributor validate [--format text|json] <path>
+distributor validate --config <path> --pipeline <id> [--bundle <path>] [--format text|json]
+```
+
+`validate` has two source modes:
+
+- Local path mode validates the bundle at `<path>`.
+- Configured source mode resolves the source from `--config <path>` and `--pipeline <id>`.
+
+Configured source flags:
+
+- `--config <path>` loads the configuration file.
+- `--pipeline <id>` selects the configured pipeline source to validate.
+- `--bundle <path>` overrides the configured source bundle path for the selected pipeline.
+- `--format text|json` selects output format.
+
+A local positional path cannot be combined with `--config`, `--pipeline`, or `--bundle`. When any configured source flag is used, both `--config` and `--pipeline` are required.
+
+### `inspect`
+
+```sh
+distributor inspect [--format text|json] <path>
+distributor inspect --config <path> --pipeline <id> [--bundle <path>] [--format text|json]
+```
+
+`inspect` uses the same source mode rules as `validate`, then reports bundle metadata instead of only validation status. Local path mode requires exactly one bundle path. Configured source mode requires both `--config` and `--pipeline`; `--bundle` may override the selected pipeline source path.
+
+### `manifest create`
+
+```sh
+distributor manifest create <bundle-path> --id <bundle-id> [options]
+distributor manifest create --id <bundle-id> [options] <bundle-path>
+```
+
+Flags may appear before or after the bundle path. Both `--flag value` and `--flag=value` forms are accepted.
+
+- `--id <bundle-id>` sets the manifest bundle identifier and is required.
+- `--created <timestamp>` sets the manifest creation timestamp. If omitted, the current UTC time is used.
+- `--file <relative-path>` includes one file in the manifest. The flag may be repeated.
+- `--overwrite` allows replacing an existing `manifest.json` file.
+- `--format text|json` selects output format.
+
+If no `--file` flags are provided, `manifest create` scans the bundle directory recursively. The command requires exactly one bundle path, refuses unsafe manifest paths, and writes `manifest.json` at the bundle root.
+
+## Common Workflows
+
+### Validate Or Inspect A Local Bundle
 
 ```sh
 go run ./cmd/distributor validate examples/source-bundle
+go run ./cmd/distributor inspect --format json examples/source-bundle
 ```
 
-Inspect a source bundle:
+### Validate Or Inspect A Configured Source
 
 ```sh
-go run ./cmd/distributor inspect examples/source-bundle
+go run ./cmd/distributor validate --config examples/local-publish.yml --pipeline example-source-bundle
+go run ./cmd/distributor inspect --config examples/local-publish.yml --pipeline example-source-bundle --format json
 ```
 
-Preview local publication without writing:
+Use `--bundle <path>` with configured source mode when automation needs to validate or inspect an alternate bundle path through the selected pipeline configuration.
+
+### Create A Manifest
+
+```sh
+go run ./cmd/distributor manifest create examples/source-bundle --id example-source-bundle --overwrite
+go run ./cmd/distributor manifest create --id example-source-bundle --overwrite examples/source-bundle
+```
+
+Use repeated `--file` flags when the manifest should include an explicit file list instead of the recursive directory scan:
+
+```sh
+go run ./cmd/distributor manifest create examples/source-bundle \
+  --id example-source-bundle \
+  --file report.md \
+  --file summary.txt \
+  --overwrite
+```
+
+### Preview Or Publish A Pipeline
 
 ```sh
 go run ./cmd/distributor run --config examples/local-publish.yml --dry-run
-```
-
-Publish the local source example:
-
-```sh
 go run ./cmd/distributor run --config examples/local-publish.yml
 ```
 
-Publish the local HTML example:
-
-```sh
-go run ./cmd/distributor run --config examples/local-html.yml
-```
-
-Preview local fan-out publication:
+Use `--format json` when automation needs structured run results. Use `--force` only when the operator has reviewed the destination state conflict and intentionally wants to continue.
+
+### Run HTML And Fan-Out Examples
 
 ```sh
+go run ./cmd/distributor run --config examples/local-html.yml --dry-run
+go run ./cmd/distributor run --config examples/local-index.yml --dry-run
 go run ./cmd/distributor run --config examples/fan-out.yml --dry-run
+go run ./cmd/distributor run --config examples/archive-and-latest.yml --dry-run
 ```
 
-## Output
+These examples exercise implemented output rendering and destination planning behavior. They still use the same `run` flags and output contract described here.
 
-`run` prints the number of configured pipelines, one line per pipeline, one line per planned destination action, and a final status line. Actions include:
+### Start The HTTP Upload Server
 
-- `publish_new`: destination has no managed state and is empty.
-- `replace_older`: destination state is older than the source manifest.
-- `skip_same`: destination state already matches the source manifest.
-- `skip_destination_newer`: destination state is newer than the source manifest.
-- `error`: planning or execution failed for that destination.
+```sh
+go run ./cmd/distributor serve --config examples/http-upload-local.yml
+```
 
-The command exits non-zero if any destination fails. Independent later destinations are still attempted.
+The server exposes health, status, and authenticated upload endpoints according to the loaded configuration. Use [Operations](operations.md) for server operation and recovery guidance.
 
-## Diagnostics
+## Output And Exit Behavior
 
-Use `validate` before publication when a producer has written a new bundle. Use `inspect` to confirm normalized ids, timestamps, digests, file paths, and file sizes.
+Text output is optimized for direct operator use. JSON output is optimized for automation and uses a command-specific result object with a shared envelope similar to:
 
-For symptom-oriented recovery steps, see [troubleshooting](troubleshooting.md). For destination state and retry behavior, see [operations](operations.md). For config fields and defaults, see [configuration](config.md).
+```json
+{
+  "schema_version": 1,
+  "command": "inspect",
+  "ok": true,
+  "warnings": [],
+  "result": {}
+}
+```
+
+- Successful JSON commands emit one JSON document on stdout.
+- Usage errors and fatal setup errors exit non-zero and do not emit a JSON result document.
+- `run --format json` emits a JSON result for partial destination failures, sets `ok` to `false`, includes result details and errors, and exits non-zero.
+- Warnings are included in JSON output and are printed in text output when relevant.
+
+## Diagnostics And Recovery
+
+- Use `validate` before `run` when checking a bundle supplied by another process.
+- Use `inspect --format json` when automation needs manifest metadata, normalized file details, or checksum information.
+- Use `run --dry-run` before publishing to review destination actions.
+- Use [Configuration](config.md) for schema and default details.
+- Use [Troubleshooting](troubleshooting.md) for common errors and corrective action.
+- Use [Operations](operations.md) for HTTP upload operation, state files, and recovery workflows.

docs/config.md

@@ -1,16 +1,25 @@
-# Distributor Configuration
+# Configuration Reference
 
-## Config File Location
+Audience: administrators, operators, and advanced users who write YAML configuration for `distributor`.
 
-`distributor run --config <path>` loads the YAML config at the provided path.
+This document is the canonical user-facing configuration reference. CLI syntax lives in [CLI](cli.md), operating procedures live in [Operations](operations.md), symptom-oriented recovery lives in [Troubleshooting](troubleshooting.md), and external contracts live under [Integrations](integrations/source-bundle.md).
 
-If `--config` is omitted, `run` uses:
+## Config File Loading
+
+`distributor run --config <path>` and `distributor serve --config <path>` load the YAML file at `<path>`. If `--config` is omitted, both commands use:
 
 ```text
 /usr/local/etc/distributor/config.yml
 ```
 
-Config parsing rejects unknown YAML fields. The current executable backend support is local only. SSH and S3 config fields are accepted by config validation, but runtime execution for those backends is unavailable.
+YAML decoding rejects unknown fields. Defaults are applied after decoding and before validation.
+
+Runtime backend support is command-specific:
+
+- `run`, `validate --config`, and `inspect --config` execute `local`, `ssh`, and `s3` sources.
+- `run` executes `local`, `ssh`, and `s3` destinations.
+- `serve` uses `http_upload` sources through the HTTP upload API and publishes to configured `local`, `ssh`, and `s3` destinations.
+- `http_upload` is valid only as a source backend.
 
 ## Minimal Local Config
 
@@ -26,11 +35,21 @@ pipelines:
         path: /srv/reports/archive
 ```
 
-This publishes source files only. It uses the default validation and transfer policies.
+This config publishes source files only. It uses default validation, destination path mapping, publish, transfer, and HTTP server values.
 
 ## Production-Oriented Local Config
 
 ```yaml
+server:
+  http:
+    bind: 127.0.0.1:8080
+    staging_root: /var/spool/distributor
+    max_upload_size: 20MB
+    queue_size: 16
+    max_concurrency: 1
+    retention: 24h
+secrets:
+  directory: /run/secrets/distributor
 pipelines:
   - id: reports
     source:
@@ -45,6 +64,8 @@ pipelines:
         publish:
           source: true
           html: false
+        path_mapping:
+          mode: preserve_relative
         transfer:
           on_destination_same: skip
           on_destination_older: replace
@@ -52,9 +73,214 @@ pipelines:
           on_conflict: fail
 ```
 
-## HTML Publication
+## HTTP Upload Source Config
 
-To publish generated HTML from Markdown files:
+HTTP upload sources are configured on pipelines and are served by `distributor serve`. Upload tokens are resolved from the process environment or `secrets.directory`; literal bearer tokens are not configured in YAML.
+
+```yaml
+server:
+  http:
+    bind: 127.0.0.1:8080
+    staging_root: /var/spool/distributor
+    max_upload_size: 20MB
+    queue_size: 16
+    max_concurrency: 1
+    retention: 24h
+pipelines:
+  - id: weather-daily
+    source:
+      backend: http_upload
+      token_env: WEATHER_DAILY_UPLOAD_TOKEN
+      staging_path: /var/spool/distributor/weather-daily
+      max_upload_size: 20MB
+    destinations:
+      - id: archive
+        backend: local
+        path: /srv/reports/archive
+```
+
+`token_env` is required for `http_upload` sources. `staging_path` defaults to `<server.http.staging_root>/<pipeline id>`. `max_upload_size` defaults to `server.http.max_upload_size`.
+
+`serve` maps each resolved bearer token to exactly one `http_upload` pipeline. Startup fails when a token is missing, empty, or duplicates another upload pipeline token.
+
+## Top-Level Fields
+
+### `server.http`
+
+`server.http` controls the HTTP upload server used by `serve`.
+
+- `bind`: optional TCP bind address. Default: `127.0.0.1:8080`.
+- `staging_root`: optional root used to default `http_upload` source staging paths. Default: `/var/spool/distributor`.
+- `max_upload_size`: optional default upload limit for HTTP upload sources. Default: `20MB`.
+- `queue_size`: optional upload admission queue size. Default: `16`.
+- `max_concurrency`: optional upload worker concurrency. Default: `1`.
+- `retention`: optional in-memory completed-run retention duration. Default: `24h`.
+
+Numeric server values and durations must be greater than zero after defaults are applied.
+
+### `secrets`
+
+- `directory`: optional directory of secret files used by the config-owned credential resolver.
+
+See [Secrets](#secrets) for resolution rules.
+
+### `pipelines`
+
+`pipelines` is required and must contain at least one pipeline.
+
+Each pipeline has:
+
+- `id`: required unique slug-like identifier. It must start with a letter or number and may contain letters, numbers, `.`, `_`, and `-`.
+- `source`: required source backend config.
+- `validation`: optional validation policy.
+- `destinations`: required non-empty destination list.
+
+Pipeline ids must be unique across the config.
+
+## Backend Reference
+
+### Local Backend
+
+Local backends can be used as sources and destinations.
+
+```yaml
+backend: local
+path: /srv/distributor/archive
+```
+
+- `backend`: required value `local`.
+- `path`: required local filesystem root for this backend.
+
+### SSH/SFTP Backend
+
+SSH backends use native SFTP and can be used as sources and destinations. Adapter protocol behavior is documented in [SSH/SFTP Integration](integrations/ssh-sftp.md).
+
+```yaml
+backend: ssh
+host: ssh.example.com
+user: distributor
+port: 22
+path: /srv/distributor/archive
+ssh_key_file: /home/distributor/.ssh/id_ed25519
+known_hosts: /home/distributor/.ssh/known_hosts
+host_key_policy: strict
+```
+
+- `backend`: required value `ssh`.
+- `host`: required SSH host.
+- `path`: required remote root path.
+- `user`: optional SSH username. If omitted, the adapter uses the current OS user when available.
+- `port`: optional TCP port. Default: `22`.
+- `ssh_key_file`: optional private key path.
+- `known_hosts`: optional OpenSSH `known_hosts` path.
+- `host_key_policy`: optional host key policy. Default: `accept-new`.
+
+Accepted host key policy values:
+
+- `strict` or boolean `true`: require a matching known host key.
+- `accept-new`: accept and persist a new host key, but reject changed known keys.
+- `off` or boolean `false`: disable host key checking.
+
+Authentication uses SSH agent identities when `SSH_AUTH_SOCK` is available, then `ssh_key_file` when configured. Password authentication is not configured in YAML.
+
+### S3-Compatible Backend
+
+S3 backends can be used as sources and destinations. Adapter protocol behavior is documented in [S3-Compatible Storage Integration](integrations/s3.md).
+
+```yaml
+backend: s3
+endpoint: https://s3.example.com
+bucket: reports
+prefix: distributor/archive
+region: us-east-1
+force_path_style: true
+credentials:
+  access_key_id_env: DISTRIBUTOR_S3_ACCESS_KEY_ID
+  secret_access_key_env: DISTRIBUTOR_S3_SECRET_ACCESS_KEY
+```
+
+- `backend`: required value `s3`.
+- `endpoint`: required S3-compatible endpoint URL.
+- `bucket`: required bucket name.
+- `prefix`: optional backend root prefix. Leading and trailing slashes are trimmed; the remaining value must be a clean relative slash-separated path.
+- `region`: optional region. Default: `us-east-1`.
+- `force_path_style`: optional addressing mode toggle. Default: `true`.
+- `credentials.access_key_id_env`: optional environment variable or secret-file name for the access key id.
+- `credentials.secret_access_key_env`: optional environment variable or secret-file name for the secret access key.
+
+The S3 credential variable names must either both be configured or both be omitted. When omitted, the AWS SDK default credential chain is used. When configured, both values must resolve to non-empty strings through the process environment or `secrets.directory`.
+
+### HTTP Upload Source Backend
+
+HTTP upload backends are valid only as pipeline sources and are served by `distributor serve`. The API contract is documented in [HTTP Upload API Contract](integrations/http-upload.md).
+
+```yaml
+backend: http_upload
+token_env: WEATHER_DAILY_UPLOAD_TOKEN
+staging_path: /var/spool/distributor/weather-daily
+max_upload_size: 20MB
+```
+
+- `backend`: required value `http_upload`.
+- `token_env`: required environment variable or secret-file name containing the bearer token.
+- `staging_path`: optional staging path. Default: `<server.http.staging_root>/<pipeline id>`.
+- `max_upload_size`: optional per-source upload limit. Default: `server.http.max_upload_size`.
+
+## Validation Policy
+
+```yaml
+validation:
+  on_digest_mismatch: fail
+```
+
+- `validation.on_digest_mismatch`: optional. Default and only accepted value: `fail`.
+
+Source bundle digest mismatches fail validation before destination writes occur. The manifest file-format contract is documented in [Source Bundle Contract](integrations/source-bundle.md).
+
+## Destination Fields
+
+Each destination embeds a backend config at the destination level and may also configure publishing, transforms, path mapping, links, and transfer behavior.
+
+```yaml
+destinations:
+  - id: archive
+    backend: local
+    path: /srv/reports/archive
+    publish:
+      source: true
+      html: false
+    path_mapping:
+      mode: preserve_relative
+    transfer:
+      on_destination_same: skip
+      on_destination_older: replace
+      on_destination_newer: skip
+      on_conflict: fail
+```
+
+- `id`: required unique slug-like identifier within the pipeline.
+- Backend fields: required according to the selected destination backend.
+- `publish`: optional publish policy. Default: source-only publication.
+- `transform`: required only when publishing generated HTML.
+- `path_mapping`: optional destination path mapping policy.
+- `links`: optional public URL metadata policy.
+- `transfer`: optional destination reconciliation policy.
+
+Destination ids must be unique within a pipeline.
+
+## Publish And Transform Policy
+
+### Source-Only Publication
+
+```yaml
+publish:
+  source: true
+  html: false
+```
+
+`publish.source` controls whether source manifest files are copied to the destination.
+
+### Markdown-To-HTML Publication
 
 ```yaml
 publish:
@@ -66,69 +292,108 @@ transform:
     mode: sidecar
 ```
 
-Sidecar generation writes `report.html` for `report.md`. It does not mutate the source bundle.
+`publish.html` controls whether generated HTML outputs are published. When `publish.html` is `true`, `transform.markdown_to_html.enabled` must also be `true`.
 
-## Reference
+Markdown transform fields:
 
-Top level:
+- `transform.markdown_to_html.enabled`: enables Markdown-to-HTML generation for this destination.
+- `transform.markdown_to_html.mode`: optional. Accepted values are `sidecar` and `index`; default is `sidecar` when a Markdown transform block is present.
+- `transform.markdown_to_html.input`: optional source manifest path for `index` mode only.
 
-- `pipelines`: required non-empty list.
+`sidecar` mode renders every manifest-listed `.md` file to a same-directory `.html` output. `index` mode renders one Markdown source to `index.html` at the destination bundle path. If `index` mode omits `input`, the selected source bundle must contain exactly one Markdown file.
 
-Pipeline:
+At least one output type must be enabled. Enabled Markdown transforms are rejected when `publish.html` is `false`, and `input` is rejected unless `mode` is `index`.
 
-- `id`: required unique slug-like identifier.
-- `source`: required backend config.
-- `validation.on_digest_mismatch`: optional; defaults to `fail`; only `fail` is supported.
-- `destinations`: required non-empty destination list.
+## Destination Path Mapping
 
-Source backend:
+```yaml
+path_mapping:
+  mode: preserve_relative
+```
 
-- `backend`: required.
-- `path`: required for `local` and `ssh`.
-- `uri`: required for `ssh`.
-- `endpoint`: required for `s3`.
-- `bucket`: required for `s3`.
-- `prefix`: optional for `s3`.
-- `region`: optional for `s3`.
-- `force_path_style`: optional for `s3`.
-- `credentials.access_key_id_env`: optional S3 credential environment variable name.
-- `credentials.secret_access_key_env`: optional S3 credential environment variable name.
+- `path_mapping.mode`: optional. Accepted values are `preserve_relative` and `fixed`; default is `preserve_relative`.
 
-Destination:
+`preserve_relative` publishes each discovered source bundle at the same path relative to the destination backend root.
 
-- `id`: required unique slug-like identifier within the pipeline.
-- Backend fields: same accepted shape as source backends, with destination fields at the destination level.
-- `publish`: optional; defaults to source-only publication.
-- `transform`: required only for generated HTML publication.
-- `transfer`: optional; defaults described below.
+`fixed` publishes one selected source bundle directly at the destination backend root. Fixed destinations select the newest discovered source bundle by manifest `created` timestamp. If multiple bundles have the same timestamp, the source-root-relative bundle path in ascending order wins.
 
-Accepted backend names:
+Fixed mapping is useful for stable latest-style paths. Preview fixed destinations with `run --dry-run`, especially before using `--force`.
 
-- `local`: executable; requires `path`.
-- `ssh`: config validation only; execution is unavailable.
-- `s3`: config validation only; execution is unavailable.
+## Destination Links
 
-Publish policy:
+```yaml
+links:
+  base_url: https://reports.example.com/archive
+  primary: auto
+```
 
-- `publish.source`: publish source artifacts.
-- `publish.html`: publish generated HTML artifacts from Markdown source files.
+- `links.base_url`: required when `links` is present. It must be an absolute `http` or `https` URL with a host and no query string or fragment.
+- `links.primary`: optional. Accepted values are `auto`, `html`, and `source`; default is `auto` when `links` is present.
 
-At least one output type must be enabled. When `publish.html` is true, `transform.markdown_to_html.enabled` must be `true` and `transform.markdown_to_html.mode` must be `sidecar`.
+`distributor` does not infer public URLs from backend config. Destination state URL fields are documented in [Destination State Contract](integrations/destination-state.md). Output URLs are built from `links.base_url`, the destination bundle path, and output paths using URL path semantics. `index.html` outputs produce directory-style URLs that omit the filename.
 
-Transfer policy:
+Primary URL policies:
 
-- `transfer.on_destination_same`: `skip` or `fail`; defaults to `skip`.
-- `transfer.on_destination_older`: `replace` or `fail`; defaults to `replace`.
-- `transfer.on_destination_newer`: `skip` or `fail`; defaults to `skip`.
-- `transfer.on_conflict`: only `fail`; defaults to `fail`.
+- `auto`: prefer `index.html`, then generated HTML, then source outputs.
+- `html`: use the first generated HTML output.
+- `source`: use the first copied source output.
+
+If no output matches the primary policy, per-output URLs may still be recorded and the top-level primary URL is omitted.
+
+## Transfer Policy
+
+```yaml
+transfer:
+  on_destination_same: skip
+  on_destination_older: replace
+  on_destination_newer: skip
+  on_conflict: fail
+```
+
+Transfer fields and accepted values:
+
+- `transfer.on_destination_same`: `skip` or `fail`. Default: `skip`.
+- `transfer.on_destination_older`: `replace` or `fail`. Default: `replace`.
+- `transfer.on_destination_newer`: `skip`, `replace`, or `fail`. Default: `skip`.
+- `transfer.on_conflict`: `fail` or `replace`. Default: `fail`.
+
+`replace` for `on_destination_newer` and `on_conflict` is honored only when `run --force` is supplied. There is no config field that enables forced replacement by default.
+
+## Size And Duration Values
+
+Upload size fields must be YAML strings with an integer and one of these suffixes:
+
+- `B`
+- `KB`
+- `MB`
+- `GB`
+
+Suffix multipliers use powers of 1024. Values must be greater than zero after defaults are applied.
+
+Duration fields must be YAML strings accepted by Go duration parsing, such as `24h`, `90m`, or `168h`. Values must be greater than zero after defaults are applied.
 
 ## Defaults
 
 Defaults are applied after YAML decoding and before validation:
 
+- `server.http.bind: 127.0.0.1:8080`
+- `server.http.staging_root: /var/spool/distributor`
+- `server.http.max_upload_size: 20MB`
+- `server.http.queue_size: 16`
+- `server.http.max_concurrency: 1`
+- `server.http.retention: 24h`
 - `validation.on_digest_mismatch: fail`
-- `publish.source: true`
-- `publish.html: false`
+- SSH `port: 22`
+- SSH `host_key_policy: accept-new`
+- S3 `region: us-east-1`
+- S3 `prefix`: leading and trailing slashes trimmed
+- S3 `force_path_style: true`
+- `http_upload` source `staging_path: <server.http.staging_root>/<pipeline id>`
+- `http_upload` source `max_upload_size: server.http.max_upload_size`
+- `publish.source: true` and `publish.html: false`
+- `transform.markdown_to_html.mode: sidecar` when a Markdown transform block is present and mode is omitted
+- `path_mapping.mode: preserve_relative`
+- `links.primary: auto` when a `links` block is present and `primary` is omitted
 - `transfer.on_destination_same: skip`
 - `transfer.on_destination_older: replace`
 - `transfer.on_destination_newer: skip`
@@ -136,18 +401,38 @@ Defaults are applied after YAML decoding and before validation:
 
 ## Secrets
 
-Do not put literal secrets in config files. S3 credentials may name environment variables:
+Do not put literal secrets in config files. `secrets.directory` lets deployments provide credential values as files:
+
+```yaml
+secrets:
+  directory: /run/secrets/distributor
+```
+
+Each regular file in the directory becomes an internal credential environment value named by the filename. Valid filenames match `[A-Za-z_][A-Za-z0-9_]*`. Directories are ignored. Symlinks to regular files are followed. Exactly one trailing LF or CRLF is trimmed from each file; other whitespace is preserved.
+
+Credential resolution checks the real process environment first, then `secrets.directory`. If both define the same name with different values, `run` emits a warning with the variable name and uses the real environment value. Secret values are not printed. The process environment is not modified, so SDK default credential chains see only real process environment variables.
+
+Fields resolved through this resolver:
 
 - `credentials.access_key_id_env`
 - `credentials.secret_access_key_env`
+- `source.token_env` for `http_upload` sources
 
-S3 execution is unavailable; these fields are accepted so config shape can be validated.
+## Maintained Examples
 
-## Examples
+Maintained examples live under [examples](../examples/). Config tests load every file listed here.
 
-Maintained examples live under [examples](../examples/):
+Local examples:
 
-- `local-to-local.yml`: minimal local config.
-- `local-publish.yml`: runnable local source publication.
-- `local-html.yml`: runnable local HTML publication.
-- `fan-out.yml`: runnable local fan-out publication to source and HTML destinations.
+- `local-to-local.yml`: minimal local-to-local config using absolute sample paths; load-tested, but paths should be adapted before running.
+- `local-publish.yml`: runnable local source publication used by the README quickstart.
+- `local-html.yml`: local sidecar HTML publication.
+- `local-index.yml`: local `index.html` publication.
+- `fan-out.yml`: local fan-out publication to source and HTML destinations.
+- `archive-and-latest.yml`: local archive plus fixed latest publication.
+- `http-upload-local.yml`: local HTTP upload server config; requires `DISTRIBUTOR_EXAMPLE_UPLOAD_TOKEN` in the process environment or as a secret-file name before running `serve`.
+
+Environment-gated remote examples:
+
+- `ssh-destination.yml`: local-to-SSH publication; replace host, user, path, key, and known-host values for an SSH/SFTP endpoint you control.
+- `s3-destination.yml`: local-to-S3 publication; replace endpoint, bucket, prefix, region, and credential variable names for an S3-compatible service you control.

docs/integrations/destination-state.md

@@ -0,0 +1,99 @@
+# Destination State Contract
+
+Audience: operators, integrators, and maintainers who inspect or reason about destination `.distributor.json` files.
+
+Each managed destination bundle path contains `.distributor.json`. This file is the destination sentinel and state record used for comparison, skip, replacement, and recovery decisions.
+
+## State Schema
+
+Current schema version: `1`.
+
+```json
+{
+  "schema_version": 1,
+  "distributor_version": "dev",
+  "pipeline_id": "reports",
+  "destination_id": "archive",
+  "published_at": "2026-06-04T12:00:00Z",
+  "source": {
+    "manifest": {
+      "schema_version": 1,
+      "id": "reports.example.2026-06-04",
+      "digest": "sha256:...",
+      "created": "2026-06-04T11:55:00Z",
+      "files": [
+        {"path": "report.md", "sha256": "sha256:...", "size": 1234}
+      ]
+    }
+  },
+  "links": {
+    "primary_url": "https://reports.example.com/archive/report.html"
+  },
+  "outputs": [
+    {
+      "path": "report.html",
+      "kind": "generated",
+      "source_path": "report.md",
+      "transform": "markdown_to_html",
+      "url": "https://reports.example.com/archive/report.html",
+      "sha256": "sha256:...",
+      "size": 2345
+    }
+  ]
+}
+```
+
+Required fields:
+
+- `schema_version`: must be `1`.
+- `pipeline_id`: configured pipeline id that wrote the state.
+- `destination_id`: configured destination id that wrote the state.
+- `published_at`: RFC3339 publication timestamp.
+- `source.manifest`: embedded source bundle manifest.
+- `outputs`: output records array; empty is allowed, but the field is required.
+
+Optional fields:
+
+- `distributor_version`: application version string when available.
+- `links.primary_url`: absolute HTTP or HTTPS URL selected by destination link policy.
+
+## Output Records
+
+Each output record has:
+
+- `path`: destination-relative output path.
+- `kind`: `source` or `generated`.
+- `source_path`: source manifest path used for the output.
+- `transform`: required for `generated` outputs; omitted for copied source outputs.
+- `url`: optional absolute HTTP or HTTPS URL for the output.
+- `sha256`: lowercase `sha256:<64 hex>` digest of the output bytes.
+- `size`: output byte size, zero or greater.
+
+Output paths must be unique and use clean relative slash-separated path rules.
+
+## Comparison Semantics
+
+`distributor` compares the current source manifest to destination state before writing:
+
+- No state and no content: publish new outputs.
+- No state and existing content: treat the destination as unmanaged.
+- Matching embedded source manifest: skip.
+- Same source id with older `created`: replace if policy allows.
+- Same source id with newer `created`: skip by default.
+- Same source id and same `created` with different digest: conflict.
+- Different source id, pipeline id, or destination id: conflict.
+- Invalid state JSON or invalid state fields: conflict.
+
+Normal replacement deletes only managed output paths recorded in `outputs` plus `.distributor.json`. Forced replacement deletes the bounded destination bundle path.
+
+## Boundaries
+
+Destination state is internal managed state written by `distributor`. Operators may inspect it during recovery, but normal workflows should not edit it by hand. Source `manifest.json` is not copied as destination state.
+
+## Tests
+
+Before changing this contract, inspect and run:
+
+```sh
+go test ./internal/state ./internal/publish
+```

docs/integrations/http-upload.md

@@ -0,0 +1,108 @@
+# HTTP Upload API Contract
+
+Audience: producers, operators, and maintainers integrating with `distributor serve`.
+
+`distributor serve` exposes a local HTTP upload API for pipelines whose source backend is `http_upload`. Each bearer token maps to exactly one configured pipeline.
+
+## Authentication
+
+Uploads authenticate with:
+
+```text
+Authorization: Bearer <token>
+```
+
+Token values are resolved from the configured `source.token_env` through the process environment or `secrets.directory`. Tokens are not configured as YAML literal values.
+
+Requests that include `pipeline` or `pipeline_id` query parameters are rejected. The bearer token selects the pipeline.
+
+## Endpoints
+
+### `GET /healthz`
+
+Returns `200 OK` when the server is running:
+
+```json
+{"status":"ok"}
+```
+
+### `POST /upload`
+
+Accepts one source bundle archive and returns after the archive is staged and validated.
+
+Accepted content types:
+
+- `application/x-tar`
+- `application/gzip`
+- `application/x-gzip`
+
+Successful admission returns `202 Accepted`:
+
+```json
+{"run_id":"reports.20260604T120000Z.abcdef12","status":"accepted"}
+```
+
+Common error responses:
+
+- `400`: pipeline query supplied, archive rejected, malformed archive, or invalid staged source bundle.
+- `401`: missing, empty, or unknown bearer token.
+- `413`: upload body exceeds the selected pipeline size limit.
+- `415`: unsupported content type.
+- `503`: upload queue is full.
+
+Error bodies use:
+
+```json
+{"error":"<message>"}
+```
+
+### `GET /runs/<run-id>`
+
+Returns an in-memory status record while retained:
+
+```json
+{
+  "run_id": "reports.20260604T120000Z.abcdef12",
+  "pipeline_id": "reports",
+  "status": "succeeded",
+  "accepted_at": "2026-06-04T12:00:00Z",
+  "started_at": "2026-06-04T12:00:01Z",
+  "finished_at": "2026-06-04T12:00:02Z",
+  "report": {}
+}
+```
+
+Status values are `accepted`, `queued`, `running`, `succeeded`, and `failed`. Failed records include `error`. Succeeded and failed records may include a run report.
+
+Unknown, malformed, expired, or process-lost run ids return `404`.
+
+## Archive Contract
+
+Upload archives must be uncompressed tar or gzip-compressed tar. The archive must contain exactly one root-level `manifest.json` and all manifest-listed files.
+
+Archive entry rules:
+
+- Paths must be clean relative slash-separated paths.
+- Absolute paths, backslashes, `.` and `..` segments, duplicate files, and nested `manifest.json` entries are rejected.
+- Only directories and regular files are accepted.
+- Symlinks, hardlinks, devices, FIFOs, sockets, and other entry types are rejected.
+
+The uploaded archive size and extracted bundle size are bounded by the selected pipeline's `source.max_upload_size`. Extracted file count is also bounded by the implementation.
+
+## Queue And Retention
+
+`server.http.queue_size` bounds accepted-but-not-started uploads plus uploads being staged. `server.http.max_concurrency` bounds publishing concurrency. The coordinator does not run two uploads for the same pipeline concurrently.
+
+Completed status records expire after `server.http.retention`; expiration removes committed staged bundle directories for completed uploads. Server restart clears queue state and status records.
+
+## Boundaries
+
+The HTTP API does not expose pipeline selection by request parameter, TLS, public routing policy, or durable status storage. Put public access controls, TLS termination, and rate limiting in deployment infrastructure.
+
+## Tests
+
+Before changing this contract, inspect and run:
+
+```sh
+go test ./internal/app ./internal/ingest
+```

docs/integrations/markdown.md

@@ -1,22 +1,27 @@
 # Markdown Integration
 
-## Purpose
+Audience: operators and maintainers who rely on generated HTML outputs from Markdown source files.
 
-Markdown-to-HTML is the only implemented external file-format integration. This note documents the renderer behavior that is externally visible in generated destination artifacts.
+Markdown-to-HTML is an implemented file-format integration used by destination transform policy.
 
 ## Dependency
 
-Rendering uses `github.com/yuin/goldmark`. The exact dependency version is pinned in `go.mod`; review that file before changing renderer behavior or diagnosing version-specific output changes.
+Rendering uses `github.com/yuin/goldmark`. The exact version is pinned in `go.mod`.
 
-## Renderer behavior
+## Renderer Behavior
 
-`internal/transform/markdown.New` constructs the renderer with `goldmark.New()` and no project-specific extensions or renderer options.
+The transformer constructs `goldmark.New()` with no project-specific extensions, parser options, renderer options, templates, CSS, or metadata injection.
 
-For each source bundle file ending in `.md`, the transform reads the Markdown source and generates an HTML sidecar in the same logical directory. The output path replaces the `.md` suffix with `.html`, so `report.md` produces `report.html`. Non-Markdown source files produce no Markdown outputs.
+Supported output modes:
+
+- `sidecar`: renders each source manifest file ending in `.md` and writes a generated output beside it with the `.md` suffix replaced by `.html`.
+- `index`: renders one Markdown source file to `index.html` at the destination bundle path.
+
+In `index` mode, `transform.markdown_to_html.input` may name the source manifest path to render. If `input` is omitted, the source manifest must list exactly one `.md` file. The selected input must be a clean relative source path, must be listed in the source manifest, and must end in `.md`.
 
 Raw HTML embedded in Markdown is not passed through by the current renderer behavior. Tests allow Goldmark's disabled-or-escaped raw HTML output forms and reject literal script tags in generated HTML.
 
-## Wrapper
+## HTML Wrapper
 
 Rendered Markdown body HTML is wrapped in a fixed document shell:
 
@@ -28,7 +33,7 @@ Rendered Markdown body HTML is wrapped in a fixed document shell:
 
 The wrapper is deterministic and does not read configuration, templates, CSS, or source manifest metadata.
 
-## Output metadata
+## Output Metadata
 
 Generated outputs record:
 
@@ -38,18 +43,16 @@ Generated outputs record:
 - SHA-256 digest of the wrapped HTML bytes;
 - byte size of the wrapped HTML bytes.
 
+Destination state stores generated outputs with `kind: generated`, `source_path`, `transform`, `sha256`, `size`, and optional `url`.
+
 ## Boundaries
 
-Markdown rendering does not mutate source bundles, publish files, write `.distributor.json`, select outputs, or choose transfer actions. Publish planning decides whether generated HTML is selected for a destination.
-
-Only sidecar output mode is supported for current behavior.
+Markdown rendering does not mutate source bundles, publish files, write `.distributor.json`, select destination actions, or choose transfer policy. Publish planning decides whether generated HTML is selected for a destination and destination state records the generated output metadata.
 
 ## Tests
 
 Before changing Markdown renderer behavior, inspect and run:
 
-```bash
+```sh
 go test ./internal/transform/markdown
 ```
-
-The tests cover sidecar naming, ignored non-Markdown files, raw HTML handling, deterministic output, digest metadata, and size metadata.

docs/integrations/s3.md

@@ -0,0 +1,73 @@
+# S3-Compatible Storage Integration
+
+Audience: operators and maintainers configuring S3-compatible sources or destinations.
+
+The S3 backend uses the AWS SDK for Go v2 against a configured S3-compatible endpoint.
+
+## Dependencies
+
+Runtime S3 support uses:
+
+- `github.com/aws/aws-sdk-go-v2`
+- `github.com/aws/aws-sdk-go-v2/config`
+- `github.com/aws/aws-sdk-go-v2/credentials`
+- `github.com/aws/aws-sdk-go-v2/service/s3`
+- `github.com/aws/smithy-go`
+
+Exact versions are pinned in `go.mod`.
+
+## Config Contract
+
+Required fields:
+
+- `backend: s3`
+- `endpoint`
+- `bucket`
+
+Optional fields:
+
+- `prefix`: backend root object-key prefix; leading and trailing slashes are trimmed.
+- `region`: defaults to `us-east-1`.
+- `force_path_style`: defaults to `true` through config defaults.
+- `credentials.access_key_id_env`
+- `credentials.secret_access_key_env`
+
+Credential environment variable names must either both be configured or both be omitted. When configured, values are resolved through the process environment or `secrets.directory` before opening the backend. When omitted, the AWS SDK default credential chain is used.
+
+## Object Key Mapping
+
+The configured `bucket` plus optional `prefix` is the backend root. Logical storage paths are joined under that prefix using slash-separated object keys.
+
+Prefixes and logical paths must be clean relative slash-separated paths. Prefixes are object-key prefixes, not real directories.
+
+## Storage Behavior
+
+The adapter uses these S3 operations:
+
+- `HeadObject` for stat and overwrite checks.
+- `GetObject` for reads.
+- `PutObject` for writes.
+- `ListObjectsV2` for walks and prefix deletion planning.
+- `DeleteObject` for managed cleanup and replacement.
+
+Writes buffer the input and set `ContentLength`. If no content type is supplied by the caller, the adapter infers a content type from the logical path.
+
+Normal replacement and failed-write cleanup delete only managed output objects plus `.distributor.json`. Forced replacement deletes objects under the bounded destination bundle prefix. The backend does not manage bucket versioning, lifecycle rules, object lock, or delete markers.
+
+## Error Mapping
+
+S3 not-found responses are translated into shared storage not-found errors where practical. Other service, credential, network, or endpoint errors are surfaced through storage errors with backend and logical path context.
+
+## Boundaries
+
+The S3 integration does not create buckets, alter bucket policy, configure TLS bypass, manage public URLs, or infer website URLs from endpoint or bucket settings. Public URL metadata is configured separately with destination `links`.
+
+## Tests
+
+Before changing this integration, inspect and run:
+
+```sh
+go test ./internal/adapters/s3
+```
+
+Live S3-compatible tests are opt-in and gated by environment variables in the adapter test package.

docs/integrations/source-bundle.md

@@ -0,0 +1,92 @@
+# Source Bundle Contract
+
+Audience: producer developers, integrators, and maintainers who create or validate source bundles consumed by `distributor`.
+
+A source bundle is a directory containing `manifest.json` and every regular file listed by that manifest. This is the producer-to-`distributor` file-format contract.
+
+## Manifest Schema
+
+Current schema version: `1`.
+
+```json
+{
+  "schema_version": 1,
+  "id": "reports.example.2026-06-04",
+  "digest": "sha256:...",
+  "created": "2026-06-04T12:00:00Z",
+  "files": [
+    {
+      "path": "report.md",
+      "sha256": "sha256:...",
+      "size": 1234
+    }
+  ]
+}
+```
+
+Required manifest fields:
+
+- `schema_version`: must be `1`.
+- `id`: non-empty bundle identifier.
+- `digest`: lowercase `sha256:<64 hex>` digest of the ordered `files` list.
+- `created`: RFC3339 timestamp.
+- `files`: non-empty ordered list of file records.
+
+Required file fields:
+
+- `path`: bundle-relative slash-separated file path.
+- `sha256`: lowercase `sha256:<64 hex>` digest of the file bytes.
+- `size`: file size in bytes, zero or greater.
+
+## Path Rules
+
+Manifest file paths must be clean relative slash-separated paths. They must not be empty, absolute, contain backslashes, contain `.` or `..` segments, include empty path segments, or normalize to a different path.
+
+Any basename of `manifest.json` or `.distributor.json` is reserved, including nested occurrences such as `nested/manifest.json`.
+
+Listed files must be regular files. Symlinks and other special file types are rejected during local bundle validation and manifest building.
+
+## Digest Rules
+
+File digests use SHA-256 over each file's raw bytes.
+
+The bundle digest is SHA-256 over the canonical JSON-like payload for the ordered file records. The payload is constructed as:
+
+```text
+[{"path":"<path>","sha256":"<sha256>","size":<size>},...]
+```
+
+File order is significant. Explicit file lists preserve caller order. Scan mode sorts paths in ascending slash-path order.
+
+## Producer APIs
+
+Go producers can use `gitea.maximumdirect.net/eric/distributor/pkg/bundle` to build and validate this contract:
+
+- `BuildManifest`: builds a manifest from explicit file paths or scan mode.
+- `WriteManifest`: writes `manifest.json`, optionally replacing an existing manifest.
+- `WriteBundle`: copies source files into a complete bundle, validates it, and promotes it into place.
+- `LoadManifest`, `ParseManifest`, `ValidateManifest`, and `ValidateBundle`: parse and validate local bundles.
+- `FileDigest`, `BundleDigest`, and `ValidateDigest`: digest helpers.
+
+CLI producers can use:
+
+```sh
+go run ./cmd/distributor manifest create <bundle-path> --id <bundle-id>
+go run ./cmd/distributor validate <bundle-path>
+```
+
+## Scan Mode
+
+Manifest scan mode walks the local bundle root recursively, includes regular files, includes dotfiles, skips files whose basename is `manifest.json` or `.distributor.json`, rejects symlinks, and sorts paths before building the manifest.
+
+## Boundaries
+
+The source bundle manifest does not configure routing, destination selection, public URLs, credentials, transforms, notification behavior, or storage backends. Those concerns belong in `distributor` configuration and destination state.
+
+## Tests
+
+Before changing this contract, inspect and run:
+
+```sh
+go test ./pkg/bundle ./internal/bundle
+```

docs/integrations/ssh-sftp.md

@@ -0,0 +1,71 @@
+# SSH/SFTP Integration
+
+Audience: operators and maintainers configuring SSH/SFTP sources or destinations.
+
+The SSH backend uses native SSH and SFTP libraries. It does not call `ssh`, `scp`, or `rsync`.
+
+## Dependencies
+
+Runtime SSH support uses:
+
+- `golang.org/x/crypto/ssh`
+- `golang.org/x/crypto/ssh/agent`
+- `golang.org/x/crypto/ssh/knownhosts`
+- `github.com/pkg/sftp`
+
+Exact versions are pinned in `go.mod`.
+
+## Config Contract
+
+Required fields:
+
+- `backend: ssh`
+- `host`
+- `path`
+
+Optional fields:
+
+- `user`: defaults to the current OS user when available.
+- `port`: defaults to `22`.
+- `ssh_key_file`: private key path.
+- `known_hosts`: OpenSSH known-hosts file path.
+- `host_key_policy`: `strict`, `accept-new`, or `off`; defaults to `accept-new`.
+
+## Authentication
+
+Authentication methods are attempted in this order:
+
+1. SSH agent identities when `SSH_AUTH_SOCK` is set.
+2. The private key configured by `ssh_key_file`.
+
+Password authentication is not configured in YAML. If neither an agent nor key file is available, opening the backend fails.
+
+## Host Key Policy
+
+- `strict`: requires a matching known host key.
+- `accept-new`: accepts and persists an unknown host key, but rejects changed known keys.
+- `off`: disables host key checking.
+
+When `known_hosts` is omitted and checking is enabled, the adapter uses the current user's default OpenSSH `known_hosts` path when available. During dry runs, accepted unknown host keys are not persisted.
+
+## Storage Behavior
+
+The configured `path` is the backend root. All source discovery, destination paths, reads, writes, state files, and deletes operate on logical paths below that root.
+
+The adapter rejects symlink ancestors for reads and writes. Reads require regular files. Writes create parent directories and prefer atomic temp-file-plus-rename writes when requested. Walk output is sorted through the shared storage walker.
+
+Managed cleanup and normal replacement delete only managed output paths plus `.distributor.json`. Forced replacement deletes the bounded destination bundle path.
+
+## Boundaries
+
+The SSH backend does not configure passwords, jump hosts, shell commands, `rsync`, host-key bypass warnings beyond command output, or broad recursive deletion outside the destination bundle path.
+
+## Tests
+
+Before changing this integration, inspect and run:
+
+```sh
+go test ./internal/adapters/ssh
+```
+
+Live SSH tests are opt-in and gated by environment variables in the adapter test package.

docs/internal/app.md

@@ -1,64 +1,66 @@
 # Application Orchestration
 
+Audience: developers and LLM coding agents changing `internal/app`.
+
 ## Purpose
 
-`internal/app` owns top-level use cases for `run`, `validate`, and `inspect`. It wires configuration, storage backends, transforms, publish planning, execution, summaries, and notification handoff.
+`internal/app` owns top-level application use cases: run, single-pipeline run, staged-source run, validate, inspect, manifest creation, and HTTP upload serving. It coordinates config loading, secret resolution, backend construction, source discovery, destination selection, publish planning/execution, notification handoff, output projection, and upload coordination.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-`Run` accepts a context, optional config path, dry-run flag, stdout writer, and optional notifier. It loads YAML config, discovers source bundles for each configured pipeline, plans each destination independently, optionally executes publish plans, writes summary output when stdout is supplied, and returns an aggregated error if any destination fails.
+Inputs include app option structs, contexts, config paths, pipeline ids, local source roots, dry-run/force flags, output format, stdout writers, HTTP requests, and optional notifier implementations.
 
-`Validate` and `Inspect` accept a local path. `Validate` discovers and validates bundles. `Inspect` writes bundle metadata and manifest file entries to stdout when provided.
-
-## Run flow
-
-The runner:
-
-1. loads config from the supplied path or `config.DefaultConfigPath`;
-2. opens the configured source backend;
-3. discovers validated bundles from the source root;
-4. opens each destination backend independently;
-5. builds a publish plan for each bundle and destination;
-6. prints plan lines and records summary counters;
-7. executes publish or replacement plans unless dry-run is enabled;
-8. invokes the notifier after successful publish or replacement actions.
-
-Destination failures are collected while later destinations continue to run. Source open and source discovery failures stop the run because there are no valid bundles to fan out.
-
-## Backend and transform wiring
-
-The app-level backend factory registers only the local backend for execution. Config validation accepts other backend shapes, but `Run` can execute only local sources and local destinations.
-
-The app-level transform registry registers Markdown-to-HTML using `internal/transform/markdown`. Lower-level publish code receives a resolver and does not import concrete transform implementations.
-
-## Dry-run behavior
-
-Dry-run still loads config, opens backends, discovers bundles, inspects destinations, resolves transforms, and builds publish plans. It does not write destination outputs, write `.distributor.json`, delete managed outputs, or notify.
-
-## Failure behavior
-
-`Run` returns immediately for config loading errors, context cancellation before work starts, source open errors, and source discovery errors. Per-destination backend, planning, execution, and notification errors are aggregated into one run error after remaining destinations have been attempted.
-
-Stdout write errors are returned immediately because the caller's requested output stream can no longer be trusted.
+Outputs include `RunReport`, validate/inspect/manifest results, CLI text/JSON projections, HTTP upload responses, upload status records, and errors. Destination-scoped failures can return a partial run report plus an aggregated error; fatal setup failures return before a complete report exists.
 
 ## Boundaries
 
-`internal/app` coordinates packages but does not own manifest validation rules, destination state comparison, storage path rules, output planning, transform rendering, or backend-specific filesystem behavior.
+`internal/app` wires packages together but does not own manifest validation rules, destination state comparison, storage path rules, publish safety policy, transform rendering, config schema validation, or backend protocol behavior.
 
-`Validate` and `Inspect` are local path commands. Remote execution wiring is outside current behavior.
+User-facing command parsing stays in `internal/cli`. User-facing config reference stays in `docs/config.md`. External contracts live under `docs/integrations/`.
 
-## Tests
+## Config Fields Used
 
-Before changing app orchestration, inspect tests under:
+The package consumes the loaded `config.Config`: `server.http`, `secrets.directory`, pipeline ids, source and destination backend fields, validation policy, publish policy, transform policy, path mapping, links, and transfer policy.
 
-- `internal/app`
-- `internal/cli`
-- `internal/publish`
+Config fields are validated and defaulted by `internal/config` before app workflows use them.
 
-## Invariants
+## Adapters Used
 
-- One source fans out to each destination independently.
-- Destination failures do not prevent later destinations from being planned.
-- Dry-run must not mutate destination storage or invoke notifications.
-- Concrete backend and transform registration stays at the app layer.
-- The default notifier is `notify.Noop`.
+The app backend factory registers runtime storage adapters for local filesystem, SSH/SFTP, and S3-compatible storage. It resolves explicit credentials through the config-owned environment resolver before opening S3 backends.
+
+The app layer registers default transforms, including Markdown-to-HTML, and supplies a transform resolver to publish planning. It uses `notify.Noop` when no notifier is supplied.
+
+## State And Manifest Behavior
+
+Run workflows discover and validate source bundles through `internal/bundle`. Destination state actions are prepared and written through `internal/publish` and `internal/state`; the app layer records report projections of those actions and results.
+
+HTTP uploads stage and validate archives before enqueueing a pipeline run with a local staged source root.
+
+## Skip And Resume Behavior
+
+Fan-out destinations are independent. A destination failure is recorded and does not prevent later destinations from being attempted. Dry-run builds plans and reports without destination writes, destination state writes, notifier calls, or SSH known-host persistence.
+
+HTTP upload status is in memory. Accepted jobs move through accepted, queued, running, succeeded, or failed states and expire after configured retention.
+
+## Failure Behavior
+
+Runtime setup fails for config load, config validation, secret loading, or credential resolution errors. Source setup failures stop the affected run before destination planning. Destination open, planning, execution, and notification failures are recorded as destination failures where a partial result exists.
+
+HTTP upload startup fails if upload tokens are missing, empty, or duplicated. Upload requests can fail during authentication, content-type validation, queue admission, archive staging, source validation, or later publish execution.
+
+## Tests To Inspect
+
+- `internal/app/*_test.go`
+- `internal/cli/root_test.go`
+- `internal/config/*_test.go`
+- `internal/ingest/*_test.go`
+- `internal/publish/*_test.go`
+
+## Architectural Invariants
+
+- App orchestration owns wiring, not low-level policy.
+- Dry-run must not write outputs, destination state, notifier events, or SSH known-host entries.
+- Fan-out destinations remain independent after a destination-scoped failure.
+- Secret values are never printed; warnings may name variables only.
+- Upload admission stages and validates a bundle before returning a run id.
+- Runtime backend registration remains app-owned.

docs/internal/bundle.md

@@ -1,53 +1,53 @@
-# Bundles
+# Source Bundle Internals
+
+Audience: developers and LLM coding agents changing `internal/bundle`.
 
 ## Purpose
 
-`internal/bundle` parses, discovers, and validates source bundles through the storage interface.
+`internal/bundle` discovers and validates source bundles through the storage abstraction. It adapts the public producer-facing source manifest contract from `pkg/bundle` to local, SSH/SFTP, S3-compatible, and test storage backends.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-Input is a backend-rooted directory tree containing one or more `manifest.json` files. Output is a deterministic list of validated bundles with relative bundle paths and normalized manifest data.
-
-## Manifest behavior
-
-The source manifest requires:
-
-- `schema_version: 1`
-- `id`
-- `digest`
-- `created`
-- non-empty `files`
-
-Each file requires `path`, `sha256`, and `size`. Digests must use lowercase `sha256:<64 hex>` format. `created` must parse as RFC3339.
-
-## Validation
-
-`ValidateManifest` owns normalized source manifest semantics: schema version, id, digest format, timestamp presence, file list presence, source path safety, duplicate file paths, reserved paths, file digest format, non-negative file sizes, and the top-level bundle digest.
-
-Storage-backed bundle validation additionally checks file existence, regular-file type, file size, and per-file SHA-256.
-
-The bundle digest is SHA-256 of a deterministic JSON array of file records in manifest order with fields `path`, `sha256`, and `size`.
-
-## Discovery
-
-Discovery walks a storage backend beneath a source root, finds `manifest.json` files, sorts bundle paths lexically, and rejects nested manifests.
-
-## Failure behavior
-
-Manifest parsing and validation fail before destination planning. Storage-backed validation fails when listed files are missing, are not regular files, have unexpected sizes, have unexpected SHA-256 digests, or when a source bundle includes unsafe or reserved paths.
+Inputs are a context, a `storage.Backend`, and a source-root prefix or bundle root path. Outputs are sorted `Bundle` records containing the source-root-relative bundle path and validated manifest.
 
 ## Boundaries
 
-Bundle code uses `internal/storage` and does not import concrete adapters. CLI local path support is wired in `internal/app`.
+`internal/bundle` delegates manifest parsing, digest calculation, source path validation, and manifest validation to `pkg/bundle`. It does not publish files, inspect destination state, choose pipelines, or know concrete backend implementations.
 
-## Tests
+The external source bundle file-format contract is documented in `docs/integrations/source-bundle.md`.
 
-Before changing bundle behavior, inspect tests under `internal/bundle`.
+## Config Fields Used
 
-## Invariants
+The package does not read config directly. App workflows pass it storage backends that were opened from configured source fields.
 
-- `manifest.json` is the only source bundle contract.
-- Source file paths must stay relative to the bundle root.
-- The top-level bundle digest is derived from manifest file records in order.
-- Discovery order is lexical and deterministic.
-- Nested manifests are rejected.
+## Adapters Used
+
+The package depends only on `internal/storage.Backend`. Concrete local, SSH/SFTP, S3-compatible, and fake backends are hidden behind that interface.
+
+## State And Manifest Behavior
+
+Discovery walks recursively under the source root, finds entries whose basename is `manifest.json`, converts each manifest path to a bundle root, sorts roots, rejects nested bundle roots, and validates each bundle.
+
+Validation reads `manifest.json`, parses it, stats each manifest-listed file, requires regular files, verifies file sizes, reads file bytes, checks per-file SHA-256 digests, and recomputes the bundle digest.
+
+## Skip And Resume Behavior
+
+The package has no skip or resume state. Each call performs discovery or validation from the supplied backend state.
+
+## Failure Behavior
+
+Failures include invalid storage prefixes, missing manifests, parse errors, nested manifests, unsafe manifest paths, non-regular files, size mismatches, digest mismatches, backend stat/read errors, and no discovered bundles.
+
+## Tests To Inspect
+
+- `internal/bundle/*_test.go`
+- `pkg/bundle/*_test.go`
+- `internal/storage/fake/*_test.go`
+
+## Architectural Invariants
+
+- Source manifest semantics remain owned by `pkg/bundle`.
+- Discovery order is deterministic.
+- Nested manifests are rejected before returning bundles.
+- Source paths stay clean, relative, slash-separated, and confined to the backend root.
+- Concrete adapters never leak into bundle validation logic.

docs/internal/config.md

@@ -1,61 +1,57 @@
 # Configuration Internals
 
+Audience: developers and LLM coding agents changing `internal/config`.
+
 ## Purpose
 
-`internal/config` defines YAML-backed configuration structs, defaulting, and validation for distributor pipelines.
+`internal/config` owns YAML config structs, config file loading, defaulting, validation, size/duration parsing, SSH/S3 normalization helpers, and the credential environment resolver.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-Input is a YAML file containing `pipelines`. Output is a `Config` value with defaults applied and validation completed. Load failures include the config path and whether the failure occurred during file loading, YAML parsing, or validation.
+Inputs are YAML files, YAML scalar values, process environment lookup functions, optional secrets directories, and `Config` values. Outputs are defaulted `Config` values, validation errors, parsed byte sizes and durations, normalized backend options, loaded secret environments, secret conflict metadata, and resolved credentials.
 
-## Loading flow
+## Boundaries
 
-`LoadFile` opens the requested path, decodes YAML with known-field checking enabled, applies defaults, and validates the result. The app uses `DefaultConfigPath` when the CLI does not supply a config path.
+The package does not open storage backends, authenticate HTTP requests, start servers, publish destinations, or execute transforms. Runtime execution support is wired by `internal/app`.
 
-Known-field checking rejects misspelled or unknown YAML keys before defaults and validation run.
+The canonical user-facing config reference is `docs/config.md`.
 
-## Defaults
+## Config Fields Used
 
-Defaults are applied in `ApplyDefaults`:
+The package defines all user-visible config fields: `server.http`, `secrets`, `pipelines`, source and destination backend fields, validation policy, publish policy, transform policy, path mapping, links, and transfer policy.
 
-- pipeline validation defaults `on_digest_mismatch` to `fail`;
-- destination publish policy defaults to source output only;
-- `transfer.on_destination_same` defaults to `skip`;
-- `transfer.on_destination_older` defaults to `replace`;
-- `transfer.on_destination_newer` defaults to `skip`;
-- `transfer.on_conflict` defaults to `fail`.
+## Adapters Used
 
-## Validation responsibilities
+No external storage adapters are used directly. The package exposes normalized config and credential values consumed by app-level adapter construction.
 
-Validation requires at least one pipeline, slug-like unique pipeline ids, one source per pipeline, at least one destination, slug-like unique destination ids within each pipeline, backend-specific required fields, valid validation policy, valid publish and transform combinations, and valid transfer actions.
+## State And Manifest Behavior
 
-`ValidatePublishTransformPolicy` is shared with publish planning so destination policy combinations are checked consistently. Publishing HTML requires an enabled Markdown-to-HTML transform in `sidecar` mode. A publish policy must select source output, HTML output, or both.
+The package does not parse source manifests or destination state. It validates config values that later affect manifest validation and destination state, such as publish/transform combinations, links, transfer policy, backend roots, S3 prefix shape, and HTTP upload source settings.
 
-## Executable support boundary
+## Skip And Resume Behavior
 
-Config validation accepts `local`, `ssh`, and `s3` backend shapes so config files can be validated as schemas. Runtime execution currently opens only local backends through `internal/app`.
+The package has no runtime skip or resume behavior. It provides transfer policy values that publish planning later applies to destination comparison outcomes.
 
-The user-facing configuration reference is `docs/config.md`; this file documents package behavior for maintainers.
+## Failure Behavior
 
-## Failure behavior
+`LoadFile` wraps file open, YAML parse, and validation failures with config path context. YAML decoding rejects unknown fields. Validation collects all detected field errors into a single error value.
 
-Load errors wrap the underlying file, YAML, or validation error with context. Validation collects all detected field errors into one error value instead of stopping at the first invalid field.
+Secret loading fails for unreadable secrets directories, invalid secret filenames, unreadable secret files, and missing or empty required credential values. Secret conflicts are returned as warnings metadata, not secret values.
 
-Unsupported backend names fail validation. Accepted backend names without runtime execution support fail later during app backend opening.
-
-## Tests
-
-Before changing config behavior, inspect:
+## Tests To Inspect
 
 - `internal/config/load_test.go`
 - `internal/config/validate_test.go`
-- example-loading coverage in `internal/config`
-- user-facing examples under `examples/`
+- `internal/config/secrets_test.go`
+- `internal/config/backend_view_test.go`
+- `internal/app/runtime_test.go`
+- example configs under `examples/`
 
-## Invariants
+## Architectural Invariants
 
 - Defaults are applied before validation.
 - Unknown YAML fields are rejected.
-- `docs/config.md` remains the canonical user-facing config reference.
-- Runtime backend execution support is not inferred from config validation support.
-- New user-visible config behavior must be covered by tests and docs in the same change.
+- `http_upload` is source-only config.
+- Credential-consuming runtime code must use the config-owned environment resolver.
+- Secret values are never printed by config warnings.
+- New user-visible config behavior must update `docs/config.md` and tests.

docs/internal/ingest.md

@@ -0,0 +1,51 @@
+# Ingestion Internals
+
+Audience: developers and LLM coding agents changing `internal/ingest`.
+
+## Purpose
+
+`internal/ingest` validates upload content types, extracts uploaded source bundle archives into local temporary storage, validates extracted bundles, and commits accepted bundles to per-run staging directories.
+
+## Inputs And Outputs
+
+Inputs are a context, upload body reader, content type, pipeline staging path, run id, maximum uploaded size, maximum extracted size, and maximum file count. Output is a `StagedBundle` containing the committed local bundle root and parsed manifest.
+
+## Boundaries
+
+The package does not authenticate HTTP requests, manage upload queues, track upload status, publish destinations, load config, or start an HTTP server. Those responsibilities live in `internal/app`.
+
+The HTTP API contract is documented in `docs/integrations/http-upload.md`.
+
+## Config Fields Used
+
+The package does not read config directly. The app layer passes effective values derived from `source.staging_path`, `source.max_upload_size`, and HTTP server defaults.
+
+## Adapters Used
+
+The package uses the local filesystem directly for temporary archive storage, extraction, validation, and final staging path promotion. It does not use the storage backend abstraction.
+
+## State And Manifest Behavior
+
+Accepted archives must contain exactly one root-level `manifest.json`. After extraction, the package validates the staged root through `pkg/bundle`, including manifest parsing, source path rules, file existence, regular-file checks, file sizes, file SHA-256 digests, and bundle digest.
+
+## Skip And Resume Behavior
+
+The package has no resume behavior. A successful call commits one complete staged bundle root. Failed calls remove temporary data created by that call.
+
+## Failure Behavior
+
+Failures include unsupported content type, unsafe run id, missing staging path, non-positive limits, oversize upload body, oversize extracted content, too many files, unsafe archive paths, duplicate files, nested manifests, unsupported tar entry types, gzip/tar read errors, bundle validation errors, and filesystem errors.
+
+## Tests To Inspect
+
+- `internal/ingest/archive_test.go`
+- `internal/app/upload_*_test.go`
+- `pkg/bundle/*_test.go`
+
+## Architectural Invariants
+
+- Invalid archives never commit a staged root.
+- Archive paths remain clean relative slash-separated paths.
+- Only directories and regular files are accepted from tar archives.
+- Source bundle validation happens before final staging path promotion.
+- Upload authentication and queueing remain outside this package.

docs/internal/link.md

@@ -0,0 +1,46 @@
+# Link URL Policy
+
+Audience: developers and LLM coding agents changing `internal/link`.
+
+## Purpose
+
+`internal/link` owns shared validation for configured and persisted HTTP link URLs.
+
+## Inputs And Outputs
+
+Input is a URL string. Output is either nil for an accepted URL or a concise validation error that callers wrap with field context.
+
+## Boundaries
+
+The package validates URL shape only. It does not construct output URLs, choose primary URLs, infer public URLs from backend configuration, parse config files, or write destination state.
+
+## Config Fields Used
+
+The package does not read config directly. `internal/config` uses it to validate `links.base_url`; `internal/state` uses it to validate persisted `links.primary_url` and output `url` fields.
+
+## Adapters Used
+
+None.
+
+## State And Manifest Behavior
+
+Destination state URL fields and configured link URLs share the same URL validation policy. Source manifests are not involved.
+
+## Skip And Resume Behavior
+
+None.
+
+## Failure Behavior
+
+Validation rejects parse failures, non-HTTP(S) schemes, missing hosts, query strings, and fragments.
+
+## Tests To Inspect
+
+- `internal/link/url_test.go`
+- callers in `internal/config`, `internal/state`, and `internal/publish`
+
+## Architectural Invariants
+
+- Configured and persisted link URLs use one validation policy.
+- URL construction remains outside `internal/link`.
+- Callers own field-specific error context.

docs/internal/notify.md

@@ -1,35 +1,48 @@
-# Notify
+# Notification Internals
+
+Audience: developers and LLM coding agents changing `internal/notify` or app notification wiring.
 
 ## Purpose
 
-`internal/notify` defines the internal notification interface used by the application runner.
+`internal/notify` defines the notification interface used by app orchestration after successful destination publication or replacement.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-Input is a notification event containing pipeline id, destination id, bundle id, bundle path, action, and output metadata. The interface returns an error so app orchestration can treat notification failures as destination failures.
-
-## Current behavior
-
-The implemented notifier is a no-op. It is invoked only after a successful publish or replacement. Dry-run, skipped destinations, and failed destinations do not invoke it.
-
-## Failure behavior
-
-`notify.Noop` always succeeds unless the context is already canceled. If a configured notifier returns an error, `internal/app` records that destination as failed and continues with remaining destinations.
+Input is a context and notification event containing pipeline id, destination id, bundle id, bundle path, action, and output metadata. Output is an error that app orchestration can record as a destination-scoped failure.
 
 ## Boundaries
 
-External notification adapters and user-facing notification configuration are outside current behavior.
+Only the no-op notifier exists in the repository. The package does not load config, send network requests, write destination state, publish files, or own run reporting.
 
-## Tests
+## Config Fields Used
 
-Before changing notification behavior, inspect:
+None.
+
+## Adapters Used
+
+None.
+
+## State And Manifest Behavior
+
+Notification events carry output metadata projected from publish plans. The package does not inspect source manifests or destination state.
+
+## Skip And Resume Behavior
+
+Dry-run, skipped destinations, failed destinations, and planning failures do not notify. The no-op notifier has no durable state.
+
+## Failure Behavior
+
+`notify.Noop` returns the context error when the context is canceled; otherwise it succeeds. If another notifier implementation returns an error, `internal/app` records the affected destination as failed and continues with remaining destinations where applicable.
+
+## Tests To Inspect
 
 - `internal/notify`
-- `internal/app/run_test.go`
+- `internal/app/run_notify.go`
+- notification coverage in `internal/app/run_test.go`
 
-## Invariants
+## Architectural Invariants
 
-- Notifications are emitted only after successful publish or replacement execution.
+- Notifications occur only after successful publish or replacement execution.
 - Dry-run never notifies.
 - Skipped and failed destinations never notify.
 - The default app notifier is `notify.Noop`.

docs/internal/publish.md

@@ -1,43 +1,63 @@
-# Publish
+# Publish Internals
+
+Audience: developers and LLM coding agents changing `internal/publish`.
 
 ## Purpose
 
-`internal/publish` plans and executes publication for one validated source bundle and one destination.
+`internal/publish` plans and executes publication for one validated source bundle and one destination bundle path. It owns destination comparison mapping, output selection, URL planning, managed cleanup selection, replacement safety, and destination state projection.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-Inputs are a source bundle, source backend, destination backend, pipeline id, destination id, publish policy, transform policy, transformer resolver, transfer policy, destination bundle path, and existing destination state.
+Inputs are a source bundle, source backend, destination backend, pipeline id, destination id, destination bundle path, path mapping mode, publish policy, transform policy, optional link policy, transformer resolver, transfer policy, distributor version, and force flag.
 
-Output is a plan with an action, reason, and selected source or generated outputs. Execution writes selected source files, generated files, and `.distributor.json` for publish or replacement actions.
-
-## Actions
-
-Supported actions are `publish_new`, `replace_older`, `skip_same`, `skip_destination_newer`, `fail_conflict`, and `fail_unmanaged`.
-
-## Failure behavior
-
-Planning fails when request fields are incomplete, publish and transform policies are invalid, selected outputs collide, HTML output is requested without Markdown inputs, destination state is invalid, destination content is unmanaged, or transfer policy maps the comparison outcome to failure.
-
-Execution fails if a write, delete, state serialization, or context check fails. Outputs written during a failed publish attempt are cleaned up through managed deletion where possible.
+Output from planning is a `Plan` with action, reason, destination identity, selected outputs, optional existing state, optional primary URL, and force metadata. Execution writes selected source outputs, generated outputs, and `.distributor.json` for executable publish or replacement actions.
 
 ## Boundaries
 
-The current implementation publishes source files and Markdown-to-HTML sidecar outputs. Backend behavior is supplied through `internal/storage`; app runtime currently supplies local backends.
+The package does not parse CLI flags, load config files, open concrete adapters, discover source bundles, select fixed-path bundle candidates, register transforms, or render command output. The app layer supplies validated request data and concrete dependencies.
 
-The package uses `internal/state` for destination comparison, `internal/storage` for IO, and the shared `internal/config` publish/transform policy helper for request validation. It resolves transforms through a narrow resolver supplied by the caller; concrete transform registration is owned by the app layer. It does not parse CLI flags or load config files.
+External destination state semantics are documented in `docs/integrations/destination-state.md`.
 
-## Safety
+## Config Fields Used
 
-Replacement deletes only outputs recorded in existing destination state plus `.distributor.json`. Failed local writes trigger cleanup of outputs written during the failed attempt.
+The package consumes already-defaulted config values for destination `publish`, `transform`, `links`, `transfer`, and path mapping mode. It uses `config.ValidatePublishTransformPolicy` for publish/transform consistency.
 
-## Tests
+## Adapters Used
 
-Before changing publish behavior, inspect tests under `internal/publish` and local run tests under `internal/app`.
+The package depends on `internal/storage.Backend` for source and destination IO, and on a narrow transformer resolver interface for generated outputs. It does not import concrete storage adapters or concrete transform implementations.
 
-## Invariants
+## State And Manifest Behavior
 
-- Publish planning is deterministic for the same source, destination state, policies, and transform outputs.
-- Replacement deletes only managed paths recorded in existing state plus `.distributor.json`.
-- Publish execution writes destination state after selected outputs are written.
-- Transform implementations are resolved through an interface supplied by the caller.
-- Unmanaged destination content is never overwritten.
+Planning inspects destination state through `internal/state`, compares it with the source manifest, and maps comparison outcomes plus transfer policy into actions: `publish_new`, `replace_older`, `force_replace`, `skip_same`, `skip_destination_newer`, `fail_conflict`, or `fail_unmanaged`.
+
+Execution writes destination state after selected outputs are written. Destination state includes copied source output metadata, generated output metadata, embedded source manifest, link metadata when configured, pipeline id, destination id, and publication timestamp.
+
+## Skip And Resume Behavior
+
+`skip_same` and `skip_destination_newer` execute as no-ops. Normal replacement removes only managed output paths from existing state plus `.distributor.json`; this allows retries without broad deletion. Failed writes trigger cleanup of outputs written during that failed attempt where practical.
+
+Forced replacement is explicit per request and deletes the bounded destination bundle path before writing new outputs and state.
+
+## Failure Behavior
+
+Planning fails for incomplete requests, invalid publish/transform policy, output path collisions, invalid destination state, unmanaged destination content without force, conflict outcomes not allowed by transfer policy, unresolved transforms, invalid Markdown output selection, and invalid link URL planning.
+
+Execution fails on delete, read, transform output, write, state validation, state serialization, or context errors. Execution refuses actions that are not executable publish or replacement actions.
+
+## Tests To Inspect
+
+- `internal/publish/*_test.go`
+- `internal/app/run_test.go`
+- `internal/state/*_test.go`
+- `internal/transform/markdown/*_test.go`
+
+## Architectural Invariants
+
+- Planning is deterministic for the same request and destination state.
+- Destination bundle paths are caller-supplied and backend-root-relative.
+- URL generation uses URL path semantics and never infers public URLs from backend config.
+- Normal replacement deletes only managed paths recorded in existing state plus `.distributor.json`.
+- Forced replacement deletes only within the supplied destination bundle path.
+- Destination state is written after selected outputs are written.
+- Transform resolution stays behind a caller-supplied interface.
+- Unmanaged content is claimed only by explicit force.

docs/internal/state.md

@@ -1,52 +1,54 @@
-# Destination State
+# Destination State Internals
+
+Audience: developers and LLM coding agents changing `internal/state`.
 
 ## Purpose
 
-`internal/state` parses, validates, writes, and compares `.distributor.json` destination state.
+`internal/state` parses, validates, serializes, and compares `.distributor.json` destination state.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-Input is JSON destination state plus the current source manifest, pipeline id, destination id, and whether the destination path has unmanaged content. Output is a deterministic comparison outcome and reason.
-
-## State behavior
-
-`.distributor.json` requires:
-
-- `schema_version: 1`
-- `pipeline_id`
-- `destination_id`
-- `published_at`
-- `source.manifest`
-- `outputs`
-
-`distributor_version` is optional diagnostic metadata. `published_at` parses as RFC3339 and distributor-written state serializes it as RFC3339 UTC.
-
-The embedded `source.manifest` is validated with the same source manifest rules used by `internal/bundle`.
-
-## Outputs
-
-Each output records `path`, `kind`, `source_path`, `sha256`, and `size`. Supported output kinds are `source` and `generated`. Generated outputs require `transform`.
-
-## Comparison
-
-Comparison outcomes cover absent destination state, unmanaged destination content, invalid state, pipeline or destination mismatch, same source manifest, older destination source, newer destination source, same-created digest conflict, and different source id conflict.
-
-## Failure behavior
-
-Invalid JSON, invalid state schema, invalid embedded source manifests, unsafe output paths, unsupported output kinds, missing generated-output transform names, and mismatched pipeline or destination ids produce comparison outcomes that publish planning can turn into fail actions.
+Inputs are destination state JSON, constructed state values, current source manifest, pipeline id, destination id, and whether the destination path has content without state. Outputs are validated state values, JSON bytes, comparison outcomes, and human-readable reasons.
 
 ## Boundaries
 
-This package does not publish files, delete files, inspect storage backends, or choose transfer policy actions. Publish planning consumes these comparison outcomes later.
+The package does not inspect storage backends, mutate files, choose transfer policy, build publish outputs, generate URLs, or parse config. Publish planning consumes state comparison outcomes.
 
-## Tests
+The external destination state contract is documented in `docs/integrations/destination-state.md`.
 
-Before changing destination state behavior, inspect tests under `internal/state`.
+## Config Fields Used
 
-## Invariants
+None directly. Destination ids, pipeline ids, and link URLs originate from config but are supplied as values by callers.
+
+## Adapters Used
+
+None.
+
+## State And Manifest Behavior
+
+`.distributor.json` schema version is `1`. Required fields are `pipeline_id`, `destination_id`, `published_at`, `source.manifest`, and `outputs`. `distributor_version` and `links` are optional.
+
+Embedded source manifests are parsed and validated through `internal/bundle`, which delegates source manifest semantics to `pkg/bundle`. Output records require clean paths, `source` or `generated` kind, valid source paths, lowercase SHA-256 digests, non-negative sizes, and transform ids for generated outputs. Stored URLs must pass `internal/link` validation.
+
+## Skip And Resume Behavior
+
+Comparison is pure. It returns outcomes for absent state, unmanaged content, invalid state, pipeline/destination mismatch, same source manifest, older destination, newer destination, same-created digest conflict, and different source id conflict. It does not decide whether to skip, replace, force, or fail; publish planning maps outcomes to actions.
+
+## Failure Behavior
+
+Parsing rejects invalid JSON, trailing data, missing required fields, invalid timestamps, invalid embedded manifests, duplicate outputs, invalid output paths, unsupported output kinds, missing generated transforms, invalid URLs, invalid digests, and negative sizes.
+
+## Tests To Inspect
+
+- `internal/state/distributor_test.go`
+- `internal/state/compare_test.go`
+- `internal/publish/*_test.go`
+
+## Architectural Invariants
 
 - `.distributor.json` is the destination sentinel and state record.
-- Embedded source manifests use the same validation rules as source bundles.
+- Comparison does not mutate storage.
+- Embedded source manifests use the source bundle contract.
 - Generated outputs always record a transform id.
-- Comparison returns outcomes and reasons; it does not mutate storage.
+- Stored URLs are optional and must be absolute HTTP or HTTPS URLs when present.
 - `distributor_version` is diagnostic metadata, not a comparison key.

docs/internal/storage.md

@@ -1,53 +1,56 @@
-# Storage
+# Storage Internals
+
+Audience: developers and LLM coding agents changing `internal/storage`, storage adapters, or storage-backed callers.
 
 ## Purpose
 
-`internal/storage` defines backend-rooted logical file access for core packages. Callers use slash-separated paths relative to a configured backend root.
+`internal/storage` defines backend-rooted logical file access, path validation, typed storage errors, traversal helpers, backend registration, managed deletion targets, and test fake storage behavior.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-The storage interface supports byte reads, stream reads, byte writes, stream writes, exact metadata lookup, traversal, destination emptiness checks, and guarded managed deletion.
-
-Entries report a logical path, type, and size when available. Entry types are `file`, `directory`, `symlink`, and `other`.
+Inputs are contexts, logical paths or prefixes, byte slices or readers, write options, walk options, delete options, and backend open configs. Outputs are file bytes, readers, `Entry` metadata, walk callbacks, boolean content checks, registered backends, and typed errors.
 
 ## Boundaries
 
-Core packages should depend on `internal/storage`, not adapter packages. Adapter-specific path handling stays behind backend implementations.
+Core packages depend on `internal/storage`, not concrete adapters. Adapter protocol behavior belongs in `internal/adapters/local`, `internal/adapters/ssh`, and `internal/adapters/s3`; external SSH/SFTP and S3 notes live under `docs/integrations/`.
 
-The local adapter lives in `internal/adapters/local`. Runtime backend construction is wired through the app-level backend factory and storage registry. The fake backend lives in `internal/storage/fake` for tests and is not registered for runtime use.
+Runtime backend construction and registration are owned by `internal/app`. The fake backend is for tests only.
 
-## Paths
+## Config Fields Used
 
-Logical file paths must be non-empty, relative, clean, slash-separated, and must not contain `.` or `..` segments or backslashes. Prefix paths follow the same rules, except an empty prefix means the backend root.
+The storage package does not read config directly. App adapter wiring converts config fields into backend open config values.
 
-## Failure behavior
+## Adapters Used
 
-Storage errors use typed categories such as not found, already exists, invalid path, conflict, permission, temporary, unsupported, and unknown. Callers should use helper predicates rather than matching error strings.
+Local, SSH/SFTP, and S3-compatible adapters implement `storage.Backend`. `internal/storage/fake` implements the same interface for tests.
 
-Backends may wrap implementation-specific errors, but callers should receive storage errors where practical. Traversal can stop cleanly with `ErrStopWalk`.
+## State And Manifest Behavior
 
-## Deletion
+Storage owns `.distributor.json` path helpers through `StateFileName`, `StatePath`, and `ManagedBundleTargets`. It does not parse source manifests or destination state.
 
-Backends expose guarded managed deletion only. `DeleteManagedBundle` may delete listed managed outputs plus `.distributor.json`; it does not provide broad recursive deletion.
+Logical paths are slash-separated and relative to a backend root. Prefix validation allows an empty prefix to mean the backend root; file path validation requires a non-empty path.
 
-## Local and fake backends
+## Skip And Resume Behavior
 
-The local adapter maps logical paths to a configured filesystem root and keeps adapter-specific path handling behind the storage interface.
+Storage has no publication skip policy. It supplies `HasAny` for unmanaged-content checks, `DeleteManagedBundle` target construction for normal replacement cleanup, and `DeletePrefix` semantics for explicit forced replacement.
 
-The fake backend is an in-memory implementation for package tests. It is not registered for runtime use.
+## Failure Behavior
 
-## Tests
+Storage errors use typed categories: not found, already exists, not empty, invalid path, conflict, permission, temporary, unsupported, and unknown. Callers should use helper predicates instead of matching strings. Traversal can stop cleanly with `ErrStopWalk`.
 
-Before changing storage behavior, inspect tests under:
+## Tests To Inspect
 
-- `internal/storage`
-- `internal/storage/fake`
-- `internal/adapters/local`
+- `internal/storage/*_test.go`
+- `internal/storage/fake/*_test.go`
+- `internal/adapters/local/*_test.go`
+- `internal/adapters/ssh/*_test.go`
+- `internal/adapters/s3/*_test.go`
 
-## Invariants
+## Architectural Invariants
 
-- Core packages depend on `internal/storage`, not concrete adapters.
-- Logical paths are slash-separated and confined to the backend root.
-- `storage.List` uses backend traversal and returns deterministic entries.
-- Managed deletion is limited to recorded outputs plus `.distributor.json`.
-- Runtime backend registration is owned by `internal/app`.
+- Logical paths are clean relative slash-separated paths confined to the backend root.
+- Core packages never import concrete adapters.
+- `storage.List` returns deterministic sorted entries.
+- Managed deletion targets are recorded outputs plus `.distributor.json`.
+- Prefix deletion is bounded to the requested logical prefix.
+- Runtime registration remains app-owned.

docs/internal/transform.md

@@ -1,46 +1,52 @@
-# Transform
+# Transform Internals
+
+Audience: developers and LLM coding agents changing `internal/transform` or transform implementations.
 
 ## Purpose
 
-`internal/transform` defines generated publication artifacts. `internal/transform/markdown` implements Markdown-to-HTML sidecar generation.
+`internal/transform` defines generated publication artifacts, transform request/response types, transform registry behavior, and transform identifiers. `internal/transform/markdown` implements Markdown-to-HTML generation.
 
-## Inputs and outputs
+## Inputs And Outputs
 
-Inputs are a validated source bundle and source backend. Outputs include destination path, source path, transform id, generated bytes, SHA-256, and size.
-
-## Registry
-
-`internal/transform` defines the transform interface and registry. The app layer registers the Markdown implementation; publish planning receives only a resolver.
-
-## Markdown behavior
-
-Markdown files ending in `.md` generate `.html` files in the same logical directory. Non-Markdown files do not generate outputs. Raw HTML embedded in Markdown is not passed through by the renderer.
-
-Generated HTML is deterministic for the same source content and transform configuration.
-
-See `docs/integrations/markdown.md` for the Goldmark integration contract.
-
-## Failure behavior
-
-Transform resolution fails when a requested transform id is not registered. Markdown rendering fails when the source file cannot be read or rendered. Publish planning fails when HTML output is requested and the selected transform produces no outputs for a bundle.
+Inputs are a validated source bundle, source storage backend, and transform options supplied by publish planning. Outputs are generated artifact records containing destination path, source path, transform id, generated bytes, SHA-256 digest, and byte size.
 
 ## Boundaries
 
-Transforms do not publish files, mutate source bundles, or write destination state. Publish planning selects and writes transform outputs.
+Transforms do not mutate source bundles, publish files, write destination state, choose destination actions, parse config, or inspect destinations. Publish planning decides whether generated outputs are selected and writes destination state later.
 
-The app layer owns default transform registration. The transform package does not import concrete transform implementations.
+The Goldmark renderer contract is documented in `docs/integrations/markdown.md`.
 
-## Tests
+## Config Fields Used
 
-Before changing transform behavior, inspect tests under:
+Transform packages do not read config directly. Publish planning passes effective `transform.markdown_to_html.mode` and `transform.markdown_to_html.input` values.
 
-- `internal/transform`
-- `internal/transform/markdown`
+## Adapters Used
 
-## Invariants
+Transforms read source files through `internal/storage.Backend`. The Markdown implementation uses `github.com/yuin/goldmark` for rendering.
+
+## State And Manifest Behavior
+
+Transform outputs carry metadata later projected into destination state. Markdown sidecar mode renders manifest-listed `.md` files to same-directory `.html` outputs. Markdown index mode renders one selected Markdown source to `index.html`.
+
+## Skip And Resume Behavior
+
+Transforms have no skip/resume state. They are deterministic for the same source bytes and transform options.
+
+## Failure Behavior
+
+Registry registration fails for empty names, nil transformers, and duplicate names. Transform resolution fails when publish planning requests an unregistered transform. Markdown rendering fails on source read errors, renderer errors, unsafe configured input, missing manifest input, non-Markdown input, ambiguous index input, or absent Markdown inputs.
+
+## Tests To Inspect
+
+- `internal/transform/*_test.go`
+- `internal/transform/markdown/*_test.go`
+- `internal/publish/*_test.go`
+
+## Architectural Invariants
 
 - Source bundle files are never mutated by transforms.
 - Generated outputs record destination path, source path, transform id, SHA-256, and size.
-- Markdown sidecar naming changes only the `.md` extension to `.html`.
-- Non-Markdown source files do not generate Markdown outputs.
+- Markdown sidecar naming changes only the `.md` suffix to `.html`.
+- Markdown index mode always writes `index.html`.
+- Non-Markdown source files do not generate sidecar outputs.
 - Transform registration stays outside publish planning.

docs/operations.md

@@ -1,85 +1,198 @@
 # Distributor Operations
 
+Audience: administrators and operators who run `distributor`, publish bundles, operate the HTTP upload service, or recover from failed runs.
+
+This document covers operating workflows, storage layout, safety behavior, and recovery. Command syntax lives in [CLI](cli.md), configuration fields live in [Configuration](config.md), symptom-specific fixes live in [Troubleshooting](troubleshooting.md), and external contracts live under [Integrations](integrations/source-bundle.md).
+
 ## Normal Workflow
 
-Validate a source bundle:
+Validate a producer bundle before publishing:
 
 ```sh
 go run ./cmd/distributor validate examples/source-bundle
 ```
 
-Preview a local publication:
+Preview a configured run before writing destination content:
 
 ```sh
 go run ./cmd/distributor run --config examples/local-publish.yml --dry-run
 ```
 
-Run the local publication:
+Publish after reviewing the preview:
 
 ```sh
 go run ./cmd/distributor run --config examples/local-publish.yml
 ```
 
-Run the local HTML publication:
+Use JSON output for automation:
 
 ```sh
-go run ./cmd/distributor run --config examples/local-html.yml
+go run ./cmd/distributor run --config examples/fan-out.yml --dry-run --format json
 ```
 
-Preview local fan-out publication:
+Use configured source diagnostics when the source is defined in YAML and may be local, SSH/SFTP, or S3-compatible storage:
 
 ```sh
-go run ./cmd/distributor run --config examples/fan-out.yml --dry-run
+go run ./cmd/distributor validate --config examples/local-publish.yml --pipeline example-source-bundle
+go run ./cmd/distributor inspect --config examples/local-publish.yml --pipeline example-source-bundle --format json
 ```
 
-## Filesystem Layout
+Remote examples under `examples/ssh-destination.yml` and `examples/s3-destination.yml` are load-tested templates. Edit their endpoint, path, key, bucket, prefix, and credential values for storage you control before running them.
 
-Source bundles are discovered beneath the configured local source root. Each bundle is a directory containing `manifest.json`.
+## Filesystem And Storage Layout
 
-Destination bundle paths preserve the source bundle path relative to the source root. A source bundle at the source root publishes to the destination root. A source bundle under `daily/` publishes under `daily/` at each destination.
+A source bundle is a directory containing `manifest.json` and every file listed in that manifest. See [Source Bundle Contract](integrations/source-bundle.md). Source discovery walks beneath the configured source backend root and finds bundle directories.
 
-The maintained examples write under `workspace/`, which is ignored by Git.
+Each destination has its own backend root:
 
-## Destination State
+- Local destinations use the configured local `path`.
+- SSH/SFTP destinations use the configured remote `path`.
+- S3-compatible destinations use the configured `bucket` plus optional `prefix`.
 
-Each published destination bundle contains `.distributor.json`. This file is the managed sentinel and destination state record. It stores:
+Destination path mapping controls where each source bundle is published beneath the destination root:
 
-- pipeline and destination identity;
-- publication timestamp;
-- source manifest used for publication;
-- copied source output metadata;
-- generated output metadata.
+- `preserve_relative` publishes each source bundle at the same source-root-relative path.
+- `fixed` publishes one selected source bundle at the destination root.
+
+Fixed destinations select the newest discovered source bundle by manifest `created` timestamp. If multiple bundles have the same timestamp, the source-root-relative bundle path in ascending order wins.
+
+Published destination bundle paths contain `.distributor.json`. See [Destination State Contract](integrations/destination-state.md). This file is both the managed sentinel and the destination state record. It records the pipeline id, destination id, publication time, source manifest, copied outputs, generated outputs, and optional public URL metadata.
 
 `manifest.json` from the source bundle is not copied as destination state.
 
-Do not edit `.distributor.json` by hand during normal operation. If it is missing or invalid while destination files remain, `distributor` treats the destination as unmanaged or conflicted.
+## Destination State And Retry Behavior
 
-## Dry Runs
+`distributor` compares the source manifest to destination `.distributor.json` before writing:
 
-`--dry-run` loads and validates config, discovers source bundles, inspects destination state, plans outputs, and prints summary lines. It does not write output files or destination state.
+- No destination state and no destination content: publish new outputs.
+- Matching destination state: skip as already published.
+- Older destination state for the same source id: replace if transfer policy allows it.
+- Newer destination state: skip by default.
+- Invalid destination state, identity mismatch, different source id, or same-created digest mismatch: fail by default.
+- Content without `.distributor.json`: fail as unmanaged content by default.
 
-Dry-run output is useful before publishing to confirm actions such as `publish_new`, `replace_older`, `skip_same`, and `skip_destination_newer`.
+Normal replacement deletes only managed output paths recorded in `.distributor.json` plus the state file, then verifies the destination bundle path is empty before writing new outputs and state.
 
-## Retry and Replacement Behavior
+If a write fails after some outputs were written, `distributor` attempts to delete outputs from that failed attempt so a retry does not treat partial outputs as unmanaged content. Operators should still inspect the destination after a failed write before retrying.
 
-If a destination has matching `.distributor.json`, publication skips it as already published.
+Fan-out destinations are independent. If one destination fails after planning or execution begins, later destinations are still attempted. The command exits non-zero if any destination failed.
 
-If destination state is older than the source manifest and transfer policy allows replacement, publication deletes only managed outputs recorded in `.distributor.json` plus the state file, then writes the new outputs and state.
+## Dry Runs And Output Review
 
-If destination state is newer than the source manifest, the default behavior is to skip. If destination state has the same source id and created timestamp but a different digest, publication fails as a conflict.
+`run --dry-run` loads config, resolves credentials, discovers source bundles, opens destinations, inspects destination state, builds publish plans, and prints actions. It does not write outputs, `.distributor.json`, or SSH `known_hosts` entries.
 
-If a destination path has files but no valid `.distributor.json`, publication fails as unmanaged content. There is no force overwrite option.
+Review these action labels before publishing:
 
-## Failure Handling
+- `publish_new`: destination is empty and unmanaged.
+- `replace_older`: destination state is older than the source.
+- `skip_same`: destination state already matches the source.
+- `skip_destination_newer`: destination state is newer than the source and is skipped.
+- `force_replace`: destructive replacement selected because `--force` is present and policy permits it.
+- `error`: planning or execution failed for that destination.
 
-If one destination fails in a fan-out run, independent later destinations are still planned and executed. The command exits non-zero after printing the final status if any destination failed.
+Fixed destinations add fixed-path warnings during dry runs, including the selected source bundle and replacement warnings when the destination root would be replaced.
 
-If a write fails during local publication, `distributor` attempts to remove outputs written during that failed attempt so a retry does not see those partial outputs as unmanaged destination content.
+JSON output includes warnings, pipeline summaries, destination action records, output records, URLs when configured, final counters, and partial failure details. Fatal setup failures such as unreadable config or invalid secrets do not produce a JSON result document.
 
-After a successful publish or replacement, the internal notifier hook runs. The current default notifier is a no-op. Skipped destinations do not invoke it.
+## Forced Replacement Workflow
 
-## Caveats
+Use `--force` only after a dry run shows the intended bounded `force_replace` action:
 
-Only local-to-local execution is available. SSH execution, S3 execution, external notification adapters, and force overwrite behavior are unavailable.
+```sh
+go run ./cmd/distributor run --config <config-path> --dry-run --force
+go run ./cmd/distributor run --config <config-path> --force
+```
 
-For symptom-oriented fixes, see [troubleshooting](troubleshooting.md). For config details, see [configuration](config.md). For command syntax, see [CLI](cli.md).
+Forced replacement can claim unmanaged non-empty destination paths. State conflicts require both `--force` and transfer policy that permits replacement:
+
+- newer destination state requires `transfer.on_destination_newer: replace`;
+- conflict outcomes require `transfer.on_conflict: replace`.
+
+Forced replacement deletes the current destination bundle path before writing outputs and state. It does not delete parent paths, sibling paths, or storage outside the destination bundle path. For fixed destinations, the destination bundle path is the backend root, so a forced replacement can clear that configured root.
+
+`--force` applies only to the current invocation. There is no config field that enables forced replacement by default.
+
+## HTTP Upload Operation
+
+The [HTTP Upload API Contract](integrations/http-upload.md) defines request and response details. `distributor serve` runs the HTTP upload API for pipelines whose source backend is `http_upload`. Each bearer token maps to exactly one configured upload pipeline. Token values come from the process environment or `secrets.directory`, not from YAML literal values.
+
+Start the maintained local example:
+
+```sh
+DISTRIBUTOR_EXAMPLE_UPLOAD_TOKEN=<token> \
+  go run ./cmd/distributor serve --config examples/http-upload-local.yml
+```
+
+Readiness:
+
+```sh
+curl http://127.0.0.1:8080/healthz
+```
+
+Upload one tar or tar.gz source bundle archive:
+
+```sh
+curl -X POST http://127.0.0.1:8080/upload \
+  -H "Authorization: Bearer $DISTRIBUTOR_EXAMPLE_UPLOAD_TOKEN" \
+  -H "Content-Type: application/gzip" \
+  --data-binary @bundle.tar.gz
+```
+
+Accepted uploads return after the archive is staged and validated:
+
+```json
+{"run_id":"example-http-upload.20260604T120000Z.abcdef12","status":"accepted"}
+```
+
+Poll status while the in-memory record is retained:
+
+```sh
+curl http://127.0.0.1:8080/runs/<run-id>
+```
+
+Status values are `accepted`, `queued`, `running`, `succeeded`, and `failed`. Completed records expire after `server.http.retention`. Expiration removes committed staged bundle directories for completed uploads. Restarting the process clears upload status, queue state, and in-memory records.
+
+Upload admission is bounded by `server.http.queue_size`. Publication concurrency is bounded by `server.http.max_concurrency`, and the coordinator does not run two uploads for the same pipeline at the same time.
+
+The upload server accepts `application/x-tar`, `application/gzip`, and `application/x-gzip`. Archives are extracted into a temporary staging directory, must contain exactly one root-level `manifest.json`, and must validate as one complete source bundle before a run id is issued. Per-source `max_upload_size` bounds both uploaded archive size and extracted bundle size. The implementation also caps extracted file count.
+
+The default bind address is private loopback. Put TLS, public routing, rate limiting, and external access policy in a reverse proxy or deployment layer.
+
+## Remote Backend Notes
+
+### SSH/SFTP
+
+SSH execution uses native SFTP. See [SSH/SFTP Integration](integrations/ssh-sftp.md). It does not shell out to `ssh`, `scp`, or `rsync`.
+
+Configure `ssh_key_file`, an SSH agent, or both. Agent identities are attempted first, followed by the configured key file. YAML password authentication is not supported.
+
+The default host key policy is `accept-new`. During dry runs, unknown host keys may be accepted for the current connection but are not persisted. Changed host keys are fatal for `strict` and `accept-new`. `host_key_policy: off` disables host key checking and should be limited to controlled test environments.
+
+### S3-Compatible Storage
+
+S3 execution uses the AWS SDK for Go v2. See [S3-Compatible Storage Integration](integrations/s3.md). Configure an endpoint, bucket, optional prefix, optional region, optional path-style setting, and optional explicit credential variable names.
+
+When explicit S3 credential variable names are configured, both must resolve to non-empty values through the process environment or `secrets.directory`. When omitted, the AWS SDK default credential chain is used as-is.
+
+Normal replacement and failed-write cleanup delete only managed output objects recorded in `.distributor.json` plus the state object. Forced replacement deletes objects under the bounded destination bundle prefix. Distributor does not manage bucket versioning or delete markers.
+
+## Secrets Operation
+
+`secrets.directory` is loaded during `run`, `serve`, and configured-source `validate` or `inspect` before credential-consuming work starts. If the directory is missing, unreadable, or contains an invalid secret filename, the command fails before storage work starts.
+
+Real process environment values take precedence over files with the same name. If the values differ and stdout is enabled, commands emit a warning naming the ignored secret variable without printing either value. The process environment is not modified.
+
+## Cleanup And Recovery
+
+Use these recovery boundaries:
+
+- For source validation failures, regenerate the source bundle and manifest together.
+- For an empty or missing destination, rerun after fixing config or storage access.
+- For unmanaged destination content, move unrelated files aside or use a different destination path before publishing.
+- For failed writes, inspect the destination bundle path, remove only confirmed partial outputs if needed, then rerun `--dry-run`.
+- For state conflicts, verify the source, pipeline, destination, and existing `.distributor.json` before considering `--force`.
+- For HTTP upload failures, inspect `/runs/<run-id>` while retained; after expiry or restart, rely on destination state and logs/output from the publishing run.
+
+Do not edit `.distributor.json` during normal recovery. Treat it as the managed state record used for comparison and safe cleanup.
+
+For symptom-specific fixes, see [Troubleshooting](troubleshooting.md).

docs/policy/architecture.md

@@ -22,19 +22,21 @@ The current core workflow is:
 2. open the source backend;
 3. discover source bundles beneath the source root;
 4. validate each source bundle and its `manifest.json`;
-5. for each configured destination, inspect destination state;
-6. compare source state to destination state;
-7. build a publish plan;
-8. optionally transform Markdown to HTML for that destination;
-9. publish selected source and generated artifacts;
-10. write `.distributor.json` as the destination sentinel/state file;
-11. run the notification hook, which is a no-op in the MVP.
+5. select the source bundle or bundles for each destination according to that destination's path mapping policy;
+6. open each destination backend independently;
+7. inspect destination state at the resolved destination bundle path;
+8. compare source state to destination state;
+9. build a publish plan that selects source files, generated files, destination paths, and optional public URLs;
+10. optionally transform Markdown to HTML for that destination;
+11. publish selected source and generated artifacts;
+12. write `.distributor.json` as the destination sentinel/state file;
+13. run the notification hook, whose default implementation is currently a no-op.
 
 ## Pipeline Model
 
 A pipeline has exactly one source and one or more destinations.
 
-The source is discovered and validated once. Each destination has independent backend configuration, publication policy, transform policy, replacement behavior, state, and notification behavior.
+The source is discovered and validated once. Each destination has independent backend configuration, path mapping, publication policy, transform policy, public link policy, replacement behavior, state, and notification behavior.
 
 The pipeline model is fan-out by design:
 
@@ -53,7 +55,7 @@ A source bundle is a directory containing `manifest.json`.
 
 `manifest.json` is the sole producer-to-`distributor` contract. `distributor` must not rely on producer-specific work directory layouts, filenames, metadata, or conventions outside the configured source root and the source manifest.
 
-The MVP source manifest schema is intentionally minimal:
+The source manifest schema is intentionally minimal:
 
 ```json
 {
@@ -73,7 +75,7 @@ The MVP source manifest schema is intentionally minimal:
 
 Required fields:
 
-- `schema_version`: source manifest schema version. MVP value: `1`.
+- `schema_version`: source manifest schema version. Current value: `1`.
 - `id`: stable bundle identifier.
 - `digest`: SHA-256 digest for the listed files.
 - `created`: RFC3339 timestamp. UTC is preferred; explicit offsets are allowed.
@@ -101,6 +103,7 @@ Each destination bundle path is managed by `.distributor.json`. This file is bot
 - the normalized source manifest used for publication;
 - metadata for copied source outputs;
 - metadata for generated outputs, such as HTML files;
+- optional URL metadata for published outputs;
 - any additional metadata required by `distributor`.
 
 A representative destination state file is:
@@ -127,14 +130,18 @@ A representative destination state file is:
       ]
     }
   },
+  "links": {
+    "primary_url": "https://reports.example.com/weather-daily/"
+  },
   "outputs": [
     {
-      "path": "report.html",
+      "path": "index.html",
       "kind": "generated",
       "source_path": "report.md",
       "transform": "markdown_to_html",
       "sha256": "sha256:...",
-      "size": 23456
+      "size": 23456,
+      "url": "https://reports.example.com/weather-daily/"
     }
   ]
 }
@@ -157,6 +164,8 @@ Transforms are configured per destination. A destination may receive source file
 
 The MVP supports only Markdown-to-HTML transformation. HTML generation must not mutate the source bundle. Generated outputs must be deterministic from the source bundle and destination transform configuration, and must be recorded in `.distributor.json`.
 
+Destination path mapping and public link generation are destination behavior. Source manifests do not declare where a bundle is published or which public URLs are recorded.
+
 The application should distinguish:
 
 - transform policy: how derived files are generated;
@@ -166,7 +175,7 @@ For example, one destination may publish source files only as a long-term archiv
 
 ## Backend Abstraction
 
-Sources and destinations use the same storage abstraction. Current runtime execution uses the local filesystem backend. Additional storage backends should be peer implementations behind the same interface, and any backend-specific execution limitation must be documented.
+Sources and destinations use the same storage abstraction. Current runtime execution uses the local filesystem, SSH/SFTP, and S3-compatible backends. Additional storage backends should be peer implementations behind the same interface, and any backend-specific execution limitation must be documented.
 
 Application logic must interact with storage through internal backend interfaces. Backend-specific behavior belongs in adapter packages. Pipeline, bundle, state, publish, and transform packages must not import service-specific or filesystem adapter implementation details.
 
@@ -187,13 +196,17 @@ Avoid dependencies for small conveniences. Do not let external dependency types
 Use this current layout unless the project has a documented reason to differ:
 
 - `cmd/distributor`: application entrypoint only.
+- `pkg/bundle`: public producer-facing source manifest model, digest logic, parsing, manifest building, complete local bundle writing, and local validation helpers.
 - `internal/app`: application orchestration and top-level use cases.
 - `internal/cli`: CLI command definitions, flags, argument parsing, and command wiring.
 - `internal/config`: configuration structs, defaults, loading, precedence, and validation.
-- `internal/bundle`: source manifest parsing, source bundle discovery, source digest validation, and source bundle model.
+- `internal/bundle`: storage-backed source bundle discovery and validation over the public manifest contract.
 - `internal/state`: `.distributor.json` parsing, validation, comparison, and output metadata.
+- `internal/link`: shared HTTP URL validation for configured and persisted link metadata.
 - `internal/storage`: backend interfaces, shared path/resource types, backend registry, and storage errors.
 - `internal/adapters/local`: local filesystem backend.
+- `internal/adapters/ssh`: SSH/SFTP backend.
+- `internal/adapters/s3`: S3-compatible object storage backend.
 - `internal/transform`: transform interfaces, registry, planning, and shared transform models.
 - `internal/transform/markdown`: Markdown-to-HTML implementation.
 - `internal/publish`: destination planning, reconciliation, safety checks, and publish execution.
@@ -226,17 +239,20 @@ Pipeline configuration should express:
 - pipeline id;
 - one source backend;
 - one or more destinations;
+- per-destination path mapping;
 - per-destination publish policy;
 - per-destination transform policy;
+- per-destination public link policy;
 - validation behavior;
 - destination conflict/replacement behavior.
 
-## Modules, Stages, and Registries
+## Modules and Registries
 
-Each major stage should have an explicit input/output contract:
+Each major workflow step should have an explicit input/output contract:
 
 - source discovery;
 - source validation;
+- destination bundle selection;
 - destination state inspection;
 - destination comparison;
 - transform planning/execution;
@@ -272,9 +288,11 @@ If the application writes durable state, writes should be atomic where practical
 
 Code that deletes, moves, or overwrites files must use narrow, explicit paths. Avoid broad parent-directory operations. Cleanup that can cause data loss must be opt-in.
 
-`distributor` must never perform broad deletion against a configured source root or destination root. Destructive replacement may occur only inside a resolved destination bundle path when a valid `.distributor.json` confirms that the path is distributor-managed.
+`distributor` must never perform broad deletion against a configured source root. Destination deletion must be bounded to the resolved destination bundle path for the current source bundle and backend root.
 
-Replacement must be narrow, logged, test-covered, and configurable. Prefer deleting files recorded in `.distributor.json` and known generated outputs rather than blindly deleting parent directories. Backend implementations must guard against path traversal, prefix confusion, and accidental root deletion.
+Normal destructive replacement may occur only when a valid `.distributor.json` confirms that the destination bundle path is distributor-managed. Explicit forced replacement is a per-run CLI workflow for supported conflict and unmanaged-content cases; it must be dry-runnable, clearly reported, and constrained to the destination bundle path.
+
+Replacement must be narrow, reported, test-covered, and configurable. Prefer normal replacement that deletes files recorded in `.distributor.json` and known generated outputs. Forced replacement may delete a bounded destination bundle prefix only when the operator explicitly requests it. Backend implementations must guard against path traversal, prefix confusion, and accidental deletion above the configured backend root.
 
 Where practical, publish operations should use staging paths or temporary objects and promote them into place only after validation and transform steps succeed.
 
@@ -293,8 +311,10 @@ Important tests include:
 - relative path safety and path traversal rejection;
 - destination `.distributor.json` parsing and comparison;
 - same/older/newer/conflict publish decisions;
+- destination bundle path mapping;
 - destructive replacement safety checks;
 - transform output planning and metadata recording;
+- public URL planning and state metadata;
 - dry-run output;
 - local backend behavior with temporary directories;
 - fake backend behavior for storage-facing core logic.

docs/policy/development.md

@@ -6,25 +6,29 @@ Use it with `docs/policy/architecture.md` and `docs/policy/documentation.md`.
 ## Repository Layout
 
 - `cmd/distributor`: executable entrypoint only.
+- `pkg/bundle`: public producer-facing source manifest and local bundle writer helpers.
 - `internal/app`: top-level use cases for `run`, `validate`, and `inspect`.
 - `internal/cli`: standard-library command parsing, flags, help text, and command wiring.
 - `internal/config`: YAML configuration structs, loading, defaults, and validation.
-- `internal/bundle`: source bundle discovery, manifest parsing, digest calculation, and validation.
+- `internal/bundle`: storage-backed source bundle discovery and validation using the public manifest contract.
 - `internal/state`: destination `.distributor.json` parsing, validation, and comparison.
 - `internal/storage`: backend interface, registry, logical path rules, typed errors, and shared storage helpers.
 - `internal/adapters/local`: local filesystem backend.
+- `internal/adapters/ssh`: SSH/SFTP backend.
+- `internal/adapters/s3`: S3-compatible object storage backend.
 - `internal/storage/fake`: in-memory backend for tests.
-- `internal/publish`: destination inspection, output planning, reconciliation, execution, and managed cleanup.
+- `internal/publish`: destination inspection, output planning, reconciliation, execution, managed cleanup, and explicit forced replacement.
 - `internal/transform`: transform interface and registry.
-- `internal/transform/markdown`: Markdown-to-HTML sidecar transform.
+- `internal/transform/markdown`: Markdown-to-HTML transform.
 - `internal/notify`: notification interface and current no-op notifier.
 - `internal/testutil`: shared test fixtures. Production code must not import this package.
 - `docs`: current user, operator, policy, internal, and roadmap documentation.
 - `examples`: copyable example configs and source bundles.
 
-Do not create new top-level package families such as `pkg`, `internal/stage`,
-`internal/modules`, or service-specific adapter directories unless the
-architecture policy or a current roadmap explicitly calls for them.
+Do not create new top-level package families such as public `pkg/...` packages
+beyond `pkg/bundle`, generic workflow containers, or service-specific adapter
+directories unless the architecture policy or a current roadmap explicitly
+calls for them.
 
 ## Common Commands
 
@@ -69,9 +73,9 @@ GOCACHE=/private/tmp/distributor-gocache GOMODCACHE=/private/tmp/distributor-gom
 - Prefer package-local helpers over broad abstractions until behavior is shared by multiple packages.
 - Keep CLI parsing in `internal/cli`; business decisions belong in `internal/app`, `internal/bundle`, `internal/publish`, `internal/state`, and related core packages.
 - Keep adapter packages thin. Backend-specific filesystem or service behavior belongs in adapters; bundle, state, transform, and publish policy belongs outside adapters.
-- Preserve public CLI behavior, config semantics, manifest schema, destination state schema, and local MVP behavior unless the current task explicitly changes them.
+- Preserve public CLI behavior, config semantics, manifest schema, destination state schema, and implemented backend behavior unless the current task explicitly changes them.
 - Use `storage.DisplayPath`, `storage.StateFileName`, `storage.StatePath`, and `storage.ManagedBundleTargets` instead of duplicating those conventions.
-- Use `bundle.ValidateManifest` for normalized source manifest semantics, including embedded source manifests in destination state.
+- Use `pkg/bundle` for normalized source manifest semantics. Internal packages should reach those rules through `internal/bundle` when they also need storage-backed bundle discovery or validation.
 - Use `config.ValidatePublishTransformPolicy` for publish and transform policy combinations.
 - Do not import concrete transform implementations from `internal/publish`; app-level wiring owns transform registration.
 - Do not import `internal/testutil` from production code.
@@ -82,6 +86,9 @@ The project currently depends on:
 
 - `gopkg.in/yaml.v3` for YAML configuration loading.
 - `github.com/yuin/goldmark` for Markdown rendering.
+- `golang.org/x/crypto/ssh`, `golang.org/x/crypto/ssh/agent`, and `golang.org/x/crypto/ssh/knownhosts` for native SSH support.
+- `github.com/pkg/sftp` for native SFTP support.
+- `github.com/aws/aws-sdk-go-v2/...` packages for S3-compatible storage support.
 
 Add external dependencies only when they materially improve correctness,
 security, interoperability, or implementation complexity. Avoid dependencies
@@ -100,9 +107,15 @@ When adding or changing configuration:
 5. Update `docs/config.md` in the same change if current user-visible config behavior changes.
 6. Update examples only with configs that are valid and executable for implemented behavior.
 
-Config validation may accept fields for backends that are not executable yet,
-but user-facing docs and examples must clearly state execution support. At the
-time of this policy, only the local backend is executable.
+Config validation may accept fields for roadmap backends before execution
+support exists, but user-facing docs and examples must clearly state execution
+support. Runtime executable backends are local, SSH, and S3.
+
+Credential-consuming code must use the config-owned environment resolver for
+explicit credential environment variable references. Do not call `os.Getenv`
+directly for backend credentials, because `secrets.directory` values are
+intentionally available through the resolver without mutating the process
+environment.
 
 ## CLI Changes
 
@@ -116,8 +129,9 @@ When adding or changing commands or flags:
 3. Add or update CLI tests in `internal/cli`.
 4. Update `docs/cli.md` if syntax, flags, output expectations, or workflows change.
 
-`validate` and `inspect` are local path commands. `run` loads configured
-pipelines and currently executes local backends only.
+`validate` and `inspect` support a local path shortcut and configured
+source-only diagnostics. `run` loads configured pipelines and executes local,
+SSH, and S3 backends.
 
 ## Storage Backends
 
@@ -133,8 +147,8 @@ When adding a backend:
 5. Add focused adapter tests and app-level wiring tests.
 6. Update user docs, operations docs, examples, and internal docs only for behavior that is actually implemented.
 
-Do not document SSH/SFTP or S3 execution as available until corresponding
-adapter packages and app wiring exist.
+Do not document future backend execution as available until the corresponding
+adapter package and app wiring exist.
 
 ## Transforms
 
@@ -158,16 +172,29 @@ Test close to the behavior being changed:
 - Use `internal/testutil` for shared valid fixtures only; keep edge cases near the package under test.
 - Run `go test ./...` after cross-package changes or documentation/example changes tied to tests.
 
+Live integration tests must be opt-in and skipped during normal `go test ./...`
+unless their required environment variables are set. Test-only environment
+variables must use this prefix shape:
+
+```text
+DISTRIBUTOR_TEST_<BACKEND>_*
+```
+
+Examples include `DISTRIBUTOR_TEST_SSH_HOST` and
+`DISTRIBUTOR_TEST_S3_ENDPOINT`. Do not use production credential variable names
+for test-only controls.
+
 ## Examples
 
 Examples under `examples/` must be valid, maintained, and free of secrets.
-They should be copyable for implemented behavior. Do not leave examples that
-look runnable but require unsupported backend execution.
+They should be copyable for implemented behavior. Remote examples must use
+placeholders or environment variables for endpoint and credential material.
 
 When changing examples:
 
 1. Keep paths relative to the repository where practical.
-2. Prefer local examples until remote backend support exists.
+2. Keep local examples runnable without external services; gate remote examples
+   behind user-provided endpoints and credentials.
 3. Run `go test ./internal/config` because config tests load examples.
 4. Update README, CLI, or config docs if links or recommended workflows change.
 

docs/policy/documentation.md

@@ -106,7 +106,7 @@ Recommended:
 - `examples/`
 - `docs/policy/development.md`
 
-### Modular, staged, service-oriented, or orchestration application
+### Modular, service-oriented, or orchestration application
 
 Required:
 - `docs/cli.md`, if CLI-based
@@ -175,7 +175,7 @@ It should include:
 - dependency policy;
 - how to add config fields;
 - how to add CLI flags;
-- how to add stages/modules/adapters, if applicable;
+- how to add modules or adapters, if applicable;
 - how to update examples;
 - documentation update expectations.
 
@@ -216,7 +216,7 @@ Explain when commands are useful, not just their syntax.
 
 **Audience:** administrators, operators
 
-Required for applications that maintain state, support resume behavior, run multiple stages, write durable artifacts, use remote storage, or require recovery procedures.
+Required for applications that maintain state, support resume behavior, run multi-step workflows, write durable artifacts, use remote storage, or require recovery procedures.
 
 It should cover:
 
@@ -248,7 +248,7 @@ Each entry should include:
 
 **Audience:** developers, LLM coding agents
 
-Required for modular, staged, service-oriented, or orchestration projects.
+Required for modular, service-oriented, or orchestration projects.
 
 This directory describes implemented internal components. It is not the roadmap.
 

docs/roadmap/documentation.md

@@ -0,0 +1,97 @@
+# Documentation Roadmap
+
+## Purpose
+
+This roadmap tracks the remaining work required to verify that project documentation complies with `docs/policy/documentation.md` and accurately reflects the current implementation.
+
+The documentation migration has rewritten the current user, operator, integration, and internal component docs. This file now records only remaining validation work. Current behavior belongs outside `docs/roadmap/`; deferred or unimplemented work belongs under `docs/roadmap/`.
+
+## Current Documentation Set
+
+Current documentation outside roadmap:
+
+- `README.md`: concise project orientation and quickstart.
+- `docs/cli.md`: canonical CLI command, flag, workflow, and output reference.
+- `docs/config.md`: canonical YAML configuration reference.
+- `docs/operations.md`: operating, safety, state, upload, and recovery guidance.
+- `docs/troubleshooting.md`: symptom-oriented diagnostic and safe-fix guide.
+- `docs/policy/architecture.md`: architecture and invariant policy.
+- `docs/policy/development.md`: contributor and coding workflow policy.
+- `docs/policy/documentation.md`: controlling documentation policy.
+- `docs/integrations/*.md`: implemented external/file-format/protocol contracts.
+- `docs/internal/*.md`: implemented internal component contracts.
+- `examples/*.yml` and `examples/source-bundle/*`: maintained example configs and source bundle fixture.
+
+Current roadmap files:
+
+- `docs/roadmap/documentation.md`: this remaining documentation validation plan.
+- `docs/roadmap/http.md`: deferred HTTP upload extensions only.
+
+Removed completed roadmap artifacts:
+
+- `docs/roadmap/audit.md`
+- `docs/roadmap/cleanup.md`
+- `docs/roadmap/implementation.md`
+
+## Remaining Documentation Validation
+
+Goal: verify the rewritten docs against tests, examples, code, links, and the documentation policy checklist.
+
+Files to create, update, delete, or move: fixes only if validation finds gaps.
+
+Repository areas to inspect:
+
+- `README.md`
+- `docs/cli.md`
+- `docs/config.md`
+- `docs/operations.md`
+- `docs/troubleshooting.md`
+- `docs/internal/`
+- `docs/integrations/`
+- `docs/policy/`
+- `examples/`
+- CLI parser code under `internal/cli`
+- config loading/defaulting/validation under `internal/config`
+- app/report/upload behavior under `internal/app`
+- source bundle, state, publish, storage, adapter, and transform packages
+
+Acceptance criteria:
+
+- Tests pass for the full repository.
+- Maintained example configs load.
+- CLI examples and flags match parser behavior.
+- Config fields and defaults match `internal/config`.
+- Operations and troubleshooting docs describe implemented behavior only.
+- Internal docs preserve package boundaries and policy-required sections.
+- Integration docs describe only implemented contracts.
+- Roadmap files contain only remaining or deferred work.
+- Links resolve.
+- No secrets or private data are present.
+
+Suggested validation commands:
+
+```sh
+go test ./...
+go test ./internal/config ./internal/cli ./internal/app
+go test ./pkg/bundle ./internal/bundle ./internal/state ./internal/publish ./internal/storage ./internal/storage/fake
+go test ./internal/adapters/local ./internal/adapters/ssh ./internal/adapters/s3 ./internal/ingest ./internal/transform/markdown
+rg -n -i "future|planned|deferred|experimental|deprecated|not implemented|old behavior" README.md docs --glob '!docs/roadmap/**' --glob '!docs/policy/**'
+rg -n "\\b(Stages?|Phases?)\\b" README.md docs --glob '!docs/roadmap/**' --glob '!docs/policy/**'
+rg -n -- "--config|--dry-run|--force|--format|--pipeline|--bundle|--id|--file|--created|--overwrite" docs/cli.md internal/cli
+rg -n "examples/" README.md docs examples internal/config/load_test.go
+```
+
+Manual review items:
+
+- Confirm README remains concise and orientation-focused.
+- Confirm `docs/config.md` is the only full config field/default reference.
+- Confirm `docs/cli.md` is the only full command/flag reference.
+- Confirm `docs/operations.md` focuses on operating and recovery.
+- Confirm `docs/troubleshooting.md` remains symptom-first.
+- Confirm `docs/internal/` describes implemented component contracts and boundaries.
+- Confirm integration docs do not claim support for unimplemented external features.
+- Confirm examples contain no secrets and distinguish local runnable examples from environment-gated remote examples.
+
+## Open Questions
+
+No open questions block the remaining validation work.

docs/roadmap/http.md

@@ -0,0 +1,61 @@
+# Roadmap: HTTP Upload Extensions
+
+## Purpose
+
+The HTTP upload API is implemented. Current behavior is documented in:
+
+- [CLI](../cli.md)
+- [Configuration](../config.md)
+- [Operations](../operations.md)
+- [Troubleshooting](../troubleshooting.md)
+- [HTTP upload contract](../integrations/http-upload.md)
+- [Application internals](../internal/app.md)
+- [Ingestion internals](../internal/ingest.md)
+
+This roadmap records HTTP upload extensions that are intentionally not part of
+the current implementation.
+
+## Deferred Extensions
+
+### Authentication
+
+- URL-token authentication for constrained clients.
+- Additional token lifecycle tooling.
+- Mutual TLS or other in-app identity mechanisms.
+
+### Archive Formats
+
+- Zstandard-compressed tar archives.
+- Additional content negotiation rules for future archive formats.
+
+### Status And Queue Durability
+
+- Durable status persistence across process restarts.
+- Database-backed queueing.
+- Recovery semantics for queued or running uploads after a restart.
+
+### Producer Coordination
+
+- Producer-supplied idempotency keys.
+- Run retry endpoints.
+- Run cancellation endpoints.
+- Run listing endpoints.
+
+### Deployment Surface
+
+- In-app TLS.
+- Public exposure defaults.
+- Browser UI.
+
+## Boundaries
+
+Current HTTP upload behavior remains intentionally small:
+
+- `http_upload` is source-only and is not a durable storage backend.
+- Upload status is memory-only.
+- Producers submit complete tar or gzip-compressed tar source bundles.
+- Producers authenticate with `Authorization: Bearer <token>`.
+- Public access policy, TLS termination, and rate limiting belong outside
+  `distributor` unless a future roadmap explicitly changes that boundary.
+
+Do not document deferred extensions as available outside `docs/roadmap/`.

docs/roadmap/implementation.md

@@ -1,463 +0,0 @@
-# Post-Local-MVP Implementation Roadmap
-
-This is the canonical active roadmap for `distributor` after the local MVP checkpoint.
-
-The original MVP stages 1-8 are complete and are no longer listed as pending implementation work. Current behavior is documented outside the roadmap in `README.md`, `docs/cli.md`, `docs/config.md`, `docs/operations.md`, `docs/troubleshooting.md`, `docs/internal/`, `docs/integrations/markdown.md`, and `docs/policy/development.md`.
-
-Future, planned, or aspirational behavior should remain under `docs/roadmap/` until implemented.
-
-## Current Baseline
-
-The implemented local MVP includes:
-
-- standard-library CLI commands for `version`, `run`, `validate`, and `inspect`;
-- YAML config loading, defaults, known-field rejection, and validation;
-- accepted config shapes for `local`, `ssh`, and `s3`, with executable backend support currently limited to `local`;
-- backend-rooted storage interface with typed errors, safe logical paths, traversal, `HasAny`, managed deletion, local backend, and fake backend;
-- source bundle discovery, manifest parsing, RFC3339 timestamp handling, duplicate path checks, path safety checks, symlink rejection, per-file digest validation, and bundle digest validation;
-- destination `.distributor.json` state parsing, validation, output metadata, and source comparison;
-- local publication of source files, Markdown sidecar HTML, or both;
-- destination output collision detection before writes;
-- managed replacement for older destination state;
-- unmanaged destination and conflict failures by default;
-- deterministic dry-run output and final run summaries;
-- deterministic sequential fan-out with aggregated failures;
-- cleanup of outputs written during failed local publish attempts where practical;
-- no-op notification hook after successful publish or replacement;
-- current user, operator, internal, integration, and development documentation for implemented behavior.
-
-The local MVP intentionally does not include executable SSH/SFTP backends, executable S3-compatible backends, force overwrite behavior, external notification adapters, warning-only digest mismatch behavior, or broad recursive destination deletion.
-
-## Active Roadmap Stages
-
-Implement each stage independently. Unless a stage explicitly says otherwise:
-
-1. read `docs/policy/architecture.md`, `docs/policy/documentation.md`, `docs/policy/development.md`, and this roadmap before editing;
-2. preserve current local MVP behavior;
-3. keep user-facing docs limited to implemented behavior;
-4. add or update focused tests for the behavior changed;
-5. run the relevant package tests and `go test ./...` for cross-package changes;
-6. avoid implementing later stages early.
-
-## Stage 1: SSH/SFTP Backend
-
-### Goal
-
-Implement native SSH/SFTP storage backend support for sources and destinations through the existing storage interface and app-level backend factory.
-
-### Implementation Scope
-
-Add an SSH/SFTP adapter package under `internal/adapters/ssh`.
-
-The backend must implement the current `internal/storage.Backend` contract:
-
-- `ReadFile` and `OpenReader`;
-- `WriteFile` and `WriteFrom`;
-- `Stat`;
-- `Walk`;
-- `HasAny`;
-- `DeleteManagedBundle`.
-
-Use native SFTP operations rather than shelling out to `ssh`, `scp`, or `rsync`.
-
-Authentication behavior:
-
-- prefer SSH agent by default;
-- use `known_hosts` validation by default where practical;
-- support optional key-file configuration only if it can be added cleanly;
-- do not support passwords in YAML in this stage.
-
-Config execution behavior:
-
-- use the existing accepted config shape:
-
-```yaml
-backend: ssh
-uri: ssh://user@example.com:22
-path: /remote/root
-```
-
-- keep secrets out of config files;
-- keep config loading and validation centralized in `internal/config`;
-- wire runtime construction through app-level backend factory and storage registry patterns.
-
-Supported pipeline combinations:
-
-- local source to SSH destination;
-- SSH source to local destination;
-- SSH source to SSH destination where feasible through streaming or backend-owned staging.
-
-Safety requirements:
-
-- enforce the same backend-rooted logical path rules as local storage;
-- reject path traversal, absolute logical paths, dot segments, and backslashes;
-- report or reject symlinks according to storage and bundle validation rules;
-- keep deletion limited to managed output paths and `.distributor.json`;
-- never delete a configured backend root;
-- preserve conservative non-force conflict behavior.
-
-### Documentation Updates
-
-After implementation, update only current-behavior docs:
-
-- `docs/config.md`: mark SSH as executable and document any implemented SSH-only fields.
-- `docs/operations.md`: add SSH source/destination operating notes and recovery boundaries.
-- `docs/troubleshooting.md`: add common SSH authentication, known-hosts, and remote path failures.
-- `docs/internal/storage.md`: add implemented SSH adapter behavior and tests.
-- `docs/policy/development.md`: update backend addition guidance if implementation changes the pattern.
-- `examples/`: add only runnable or clearly environment-gated SSH examples.
-
-Do not document S3 or force overwrite as implemented in this stage.
-
-### Tests
-
-Add unit tests for:
-
-- SSH config execution wiring;
-- URI and path handling;
-- logical path validation;
-- storage error translation where practical;
-- `Walk` and `HasAny` behavior through test doubles or controlled fixtures;
-- managed deletion boundaries;
-- app-level local-to-SSH and SSH-to-local planning or wiring using fakes/mocks where possible.
-
-Add integration tests only if they are skipped unless explicit SSH test endpoint environment variables are configured. Normal `go test ./...` must not require a live SSH server.
-
-### Completion Criteria
-
-- SSH/SFTP backend compiles and satisfies `storage.Backend`.
-- Runtime `run` can execute supported SSH source and destination flows.
-- Local MVP tests still pass.
-- Normal test runs do not require a live SSH server.
-- User docs accurately describe implemented SSH behavior and boundaries.
-
-## Stage 2: S3-Compatible Backend
-
-### Goal
-
-Implement S3-compatible object storage backend support for sources and destinations through the existing storage interface and app-level backend factory.
-
-### Implementation Scope
-
-Add an S3-compatible adapter package under `internal/adapters/s3`.
-
-The backend must implement the current `internal/storage.Backend` contract:
-
-- `ReadFile` and `OpenReader`;
-- `WriteFile` and `WriteFrom`;
-- `Stat`;
-- `Walk`;
-- `HasAny`;
-- `DeleteManagedBundle`.
-
-Use the existing accepted config shape:
-
-```yaml
-backend: s3
-endpoint: https://s3.example.com
-bucket: reports
-prefix: some/prefix
-region: us-east-1
-force_path_style: true
-credentials:
-  access_key_id_env: DISTRIBUTOR_S3_ACCESS_KEY_ID
-  secret_access_key_env: DISTRIBUTOR_S3_SECRET_ACCESS_KEY
-```
-
-Credential behavior:
-
-- read access key and secret key from the named environment variables when configured;
-- support standard SDK credential discovery only if it does not weaken explicit config behavior;
-- do not put literal secrets in YAML.
-
-Object semantics:
-
-- treat prefixes as object trees, not real directories;
-- normalize configured prefix plus logical path with exact path-boundary matching;
-- `Stat` must not synthesize directory metadata only because objects exist below a prefix;
-- `Walk` should use object-list pagination and should not load an entire prefix into memory;
-- `HasAny` should stop after the first matching object;
-- `DeleteManagedBundle` must delete only listed managed output objects plus `.distributor.json`.
-
-Write behavior:
-
-- treat successful object PUT as publish-on-success;
-- set content type from `storage.WriteOptions` where available;
-- spool or buffer `WriteFrom` only when required by the SDK or backend;
-- preserve overwrite checks and conservative conflict behavior.
-
-Content type behavior should cover at least:
-
-- `.md`: `text/markdown; charset=utf-8`;
-- `.html`: `text/html; charset=utf-8`;
-- `.json`: `application/json`;
-- `.txt`: `text/plain; charset=utf-8`.
-
-Supported pipeline combinations:
-
-- local source to S3 destination;
-- S3 source to local destination;
-- S3 source to S3 destination where feasible through streaming or backend-owned staging.
-
-### Documentation Updates
-
-After implementation, update only current-behavior docs:
-
-- `docs/config.md`: mark S3 as executable and document implemented credential behavior.
-- `docs/operations.md`: add S3 source/destination layout, prefix, and recovery notes.
-- `docs/troubleshooting.md`: add common S3 credential, bucket, endpoint, prefix, and permission failures.
-- `docs/internal/storage.md`: add implemented S3 adapter behavior and tests.
-- `docs/policy/development.md`: update backend addition guidance if implementation changes the pattern.
-- `examples/`: add only safe S3 examples that use placeholder endpoints and environment variable names.
-
-Do not document force overwrite or notification adapters as implemented in this stage.
-
-### Tests
-
-Add unit tests for:
-
-- S3 config execution wiring;
-- credential environment variable handling;
-- key and prefix normalization;
-- exact prefix boundary behavior;
-- path traversal rejection;
-- content type selection;
-- paginated `Walk` behavior through mocks/fakes;
-- early-stop `HasAny`;
-- managed deletion boundaries;
-- publish planning with S3 destination state fixtures.
-
-Add integration tests only if they are skipped unless explicit S3-compatible endpoint credentials are configured. Normal `go test ./...` must not require live S3 credentials.
-
-### Completion Criteria
-
-- S3-compatible backend compiles and satisfies `storage.Backend`.
-- Runtime `run` can execute supported S3 source and destination flows.
-- Local and SSH behavior, if implemented, remain unchanged.
-- Normal test runs do not require live S3.
-- User docs accurately describe implemented S3 behavior and boundaries.
-
-## Stage 3: Cross-Backend Hardening and Documentation
-
-### Goal
-
-Harden behavior across implemented backend combinations, improve operator-facing failures, and synchronize current-behavior documentation and examples after remote backend support exists.
-
-### Implementation Scope
-
-Exercise and harden representative flows across all implemented backend types:
-
-- local source to local archive destination;
-- local source to local HTML destination;
-- local source to multiple destinations with different publish policies;
-- local source to SSH destination, when SSH is implemented and test credentials exist;
-- SSH source to local destination, when SSH is implemented and test credentials exist;
-- local source to S3 destination, when S3 is implemented and test credentials exist;
-- S3 source to local destination, when S3 is implemented and test credentials exist.
-
-Improve error context where practical for:
-
-- invalid config;
-- invalid source manifest;
-- digest mismatch;
-- destination conflict;
-- unmanaged destination path;
-- backend read, write, stat, walk, and delete failures;
-- transform failures;
-- partial fan-out failures.
-
-Ensure errors and logs identify pipeline id, destination id, bundle path or id, backend type, and logical path where useful without exposing secrets.
-
-Do not add force overwrite behavior in this stage.
-
-### Documentation Updates
-
-Update current-behavior docs after hardening:
-
-- `README.md`: keep the quickstart local unless remote examples become safe and concise.
-- `docs/cli.md`: document any changed output or diagnostics.
-- `docs/config.md`: ensure backend support status and config reference match implementation.
-- `docs/operations.md`: document cross-backend state layout, retry behavior, and recovery caveats.
-- `docs/troubleshooting.md`: add recurring SSH/S3 failure modes discovered during hardening.
-- `docs/internal/`: update storage, publish, app, and config internals where behavior changed.
-- `examples/`: keep examples copyable and free of secrets; remote examples must rely on placeholders and environment variables.
-
-### Tests
-
-Add or expand tests for:
-
-- dry-run across multiple destinations and backend types;
-- partial failure behavior;
-- repeated run idempotency;
-- older/newer destination state behavior across backends;
-- destination state output metadata accuracy;
-- generated HTML output metadata accuracy;
-- destructive replacement safety across implemented backends;
-- error context for common failures.
-
-Integration tests for SSH or S3 must remain opt-in through environment variables.
-
-### Completion Criteria
-
-- Implemented backend combinations behave consistently through the common pipeline path.
-- Repeated runs are idempotent.
-- Destructive paths remain bounded to managed destination bundle paths.
-- Operator-facing errors are actionable.
-- Current-behavior docs and examples match implemented backend support.
-
-## Stage 4: Explicit Force Overwrite
-
-### Goal
-
-Introduce explicit operator-requested force behavior for controlled overwrite cases that remain intentionally unsupported by default.
-
-### Implementation Scope
-
-Add a CLI-only force option:
-
-```bash
-distributor run --config config.yml --force
-```
-
-Force must be explicit per run. Do not add a persistent config default for force behavior.
-
-Define and implement force planning for:
-
-- unmanaged non-empty destination paths;
-- destination state with a different source id;
-- destination state with matching source id and matching `created` timestamp but different digest;
-- destination state with mismatched `pipeline_id` or `destination_id`;
-- destination newer than source when transfer policy explicitly allows replacement.
-
-Once force behavior exists, update transfer policy validation only for values supported by implemented force behavior:
-
-- `on_destination_newer: replace`;
-- `on_conflict: replace`.
-
-Safety requirements:
-
-- non-force behavior remains unchanged and conservative;
-- dry-run must show destructive force actions before any forced run;
-- force must never delete above the resolved destination bundle path or configured destination prefix;
-- local replacement should remain staged where practical;
-- S3 replacement must remain constrained to the destination bundle prefix;
-- managed state should still be written only after successful output writes;
-- logs and output must clearly mark force decisions.
-
-### Documentation Updates
-
-After implementation, update:
-
-- `docs/cli.md`: document `--force` syntax and dry-run workflow.
-- `docs/config.md`: document newly accepted transfer policy values and note force is CLI-only.
-- `docs/operations.md`: document safe force workflow and recovery boundaries.
-- `docs/troubleshooting.md`: describe when force may be appropriate and when it remains unsafe.
-- `docs/internal/publish.md` and `docs/internal/state.md`: document force planning and comparison handling.
-
-Do not document force as a default or config-only behavior.
-
-### Tests
-
-Add tests for:
-
-- force rejected or unavailable when the flag is absent;
-- unmanaged non-empty destination overwritten only with force;
-- different source id overwritten only with force and allowed policy;
-- same id and created timestamp with different digest overwritten only with force and allowed policy;
-- destination newer replaced only with force and allowed policy;
-- pipeline or destination id mismatch overwritten only with force and allowed policy;
-- dry-run reports destructive force actions without writing;
-- force deletes only bounded destination bundle paths;
-- local, SSH, and S3 backends, where implemented, preserve deletion boundaries.
-
-### Completion Criteria
-
-- Force overwrite behavior is explicit, logged, dry-runnable, and test-covered.
-- Default non-force behavior remains unchanged.
-- User docs clearly describe force risks and safe workflow.
-
-## Stage 5: Release Readiness
-
-### Goal
-
-Perform a final quality pass before treating `distributor` as ready for routine use against real producer pipelines and implemented destination backends.
-
-### Implementation Scope
-
-Review:
-
-- package boundaries against `docs/policy/architecture.md`;
-- contributor workflow against `docs/policy/development.md`;
-- user docs against `docs/policy/documentation.md`;
-- CLI UX and command output;
-- config validation and examples;
-- manifest and state compatibility;
-- destructive operation safety;
-- backend error handling;
-- logging and diagnostics for unattended operation;
-- test coverage for core invariants.
-
-Do not add new product features in this stage.
-
-### Documentation Updates
-
-Update current-behavior docs only for issues found during the readiness review.
-
-If release packaging, version injection, or installation workflow is added, document it in the appropriate current-behavior user or development docs.
-
-### Tests
-
-Run:
-
-```bash
-go test ./...
-```
-
-Also verify representative CLI examples that are documented as runnable.
-
-### Completion Criteria
-
-- A dry-run can be performed safely against real configured sources and destinations.
-- Repeated runs are idempotent.
-- Destructive replacement cannot occur outside managed destination bundle paths.
-- Current docs accurately reflect the application.
-- The project is ready to deploy against one real producer pipeline.
-
-## Deferred Work
-
-The following work remains intentionally deferred unless a future roadmap promotes it:
-
-- external notification adapters such as email, ntfy, Gotify, or Pushover;
-- RSS or Atom feed generation;
-- static site index pages beyond sidecar HTML output;
-- destination path remapping rules;
-- HTML themes beyond the minimal deterministic template;
-- full plugin architecture;
-- web UI;
-- report editing;
-- producer pipeline execution;
-- database-backed state;
-- complex retry queues;
-- concurrent publication workers;
-- symlink support;
-- warning-only digest mismatch handling;
-- password-based SSH authentication in YAML;
-- broad recursive or prefix deletion outside explicitly bounded force behavior.
-
-## Validation
-
-For roadmap-only edits:
-
-```bash
-git status --short
-git diff -- docs/roadmap
-rg -n "docs/roadmap/(packages|contracts|storage|config|documentation)\\.md" README.md docs examples
-rg -n "docs/roadmap/(packages|contracts|storage|config|documentation)\\.md" .
-rg -n "SSH|S3|--force|force overwrite|notification adapter|future|planned" README.md docs/*.md docs/internal docs/policy examples
-```
-
-Also search `docs/roadmap` for old MVP stage headings and titles from deleted roadmap files. That check should return no matches.
-
-The final SSH/S3/force/future-work search is not expected to return zero results. Review matches and confirm they are either under roadmap material or clearly marked as unsupported current behavior.
-
-Go tests are not required for documentation-only roadmap rationalization unless examples, behavior docs, or code change.

docs/troubleshooting.md

@@ -1,8 +1,14 @@
 # Distributor Troubleshooting
 
-## `load config ... no such file or directory`
+Audience: administrators and operators diagnosing `distributor` command, configuration, publishing, storage, or HTTP upload failures.
 
-Likely cause: `run` could not find the config path. If `--config` is omitted, the default path is `/usr/local/etc/distributor/config.yml`.
+Each entry lists the symptom, likely cause, diagnostic step, safe fix, and relevant reference link. Command syntax lives in [CLI](cli.md), configuration fields live in [Configuration](config.md), and operating procedures live in [Operations](operations.md).
+
+## Config File Is Missing
+
+Symptom: `load config ... no such file or directory`.
+
+Likely cause: `--config` points to a missing file, or `--config` was omitted and `/usr/local/etc/distributor/config.yml` is not installed.
 
 Diagnostic:
 
@@ -10,11 +16,15 @@ Diagnostic:
 ls -l <config-path>
 ```
 
-Safe fix: pass an existing config path with `--config`, or install a config at the default path. See [configuration](config.md).
+Safe fix: pass an existing file with `--config`, or install a config at the default path.
 
-## `parse config ... field not found`
+Reference: [Configuration](config.md#config-file-loading).
 
-Likely cause: the YAML contains an unknown field. Config loading rejects unknown keys.
+## Config Contains An Unknown Field
+
+Symptom: `parse config ... field not found`.
+
+Likely cause: the YAML contains a key that is not part of the implemented config schema.
 
 Diagnostic:
 
@@ -22,11 +32,15 @@ Diagnostic:
 go run ./cmd/distributor run --config <config-path> --dry-run
 ```
 
-Safe fix: compare the file to the reference in [configuration](config.md) and remove or rename unsupported fields.
+Safe fix: remove or rename unsupported fields using the canonical config reference.
 
-## `validate config ... backend ... is unsupported`
+Reference: [Configuration](config.md).
 
-Likely cause: a source or destination uses a backend name other than `local`, `ssh`, or `s3`.
+## Backend Name Or Placement Is Invalid
+
+Symptom: `backend ... is unsupported` or `http_upload is only supported for sources`.
+
+Likely cause: a backend name is misspelled, not executable, or configured in the wrong role.
 
 Diagnostic:
 
@@ -34,23 +48,15 @@ Diagnostic:
 rg -n "backend:" <config-path>
 ```
 
-Safe fix: use `backend: local` for executable workflows. SSH and S3 config shapes are accepted only for validation; runtime execution is unavailable.
+Safe fix: use `local`, `ssh`, or `s3` for executable sources and destinations. Use `http_upload` only as a source served by `distributor serve`.
 
-## `backend ssh is not implemented for execution` or `backend s3 is not implemented for execution`
+Reference: [Configuration](config.md#backend-reference).
 
-Likely cause: the config validates but `run` tried to execute a remote backend.
+## CLI Arguments Select The Wrong Source Mode
 
-Diagnostic:
+Symptom: `configured source mode requires --pipeline`, `does not accept a local path with --config, --pipeline, or --bundle`, `validate command requires a path`, or `inspect command requires a path`.
 
-```sh
-go run ./cmd/distributor run --config <config-path> --dry-run
-```
-
-Safe fix: use local destinations for current executable workflows, or keep remote backend configs under roadmap material unless those adapters are added. See [configuration](config.md).
-
-## `validate command requires a path` or `inspect command requires a path`
-
-Likely cause: `validate` or `inspect` was run without a path.
+Likely cause: `validate` or `inspect` mixed local path mode with configured source mode, or omitted the required source selector.
 
 Diagnostic:
 
@@ -59,23 +65,79 @@ go run ./cmd/distributor validate --help
 go run ./cmd/distributor inspect --help
 ```
 
-Safe fix: pass a local source bundle directory or a local tree containing source bundles.
+Safe fix: use either `distributor validate <path>` / `distributor inspect <path>`, or use `--config <path> --pipeline <id>` with optional `--bundle <path>`.
 
-## `no bundles found under "."`
+Reference: [CLI](cli.md#validate).
 
-Likely cause: the selected source root does not contain a `manifest.json` source bundle.
+## Output Format Is Invalid
+
+Symptom: `format must be text or json`.
+
+Likely cause: an unsupported value was passed to `--format`.
 
 Diagnostic:
 
 ```sh
-find <source-root> -name manifest.json -print
+go run ./cmd/distributor run --help
 ```
 
-Safe fix: point the command or config at the directory containing the source bundle, or write a valid `manifest.json` and listed files. See [CLI](cli.md).
+Safe fix: use `--format text` or `--format json`.
 
-## `sha256 mismatch`, `size mismatch`, or `digest mismatch`
+Reference: [CLI](cli.md#common-output-format).
 
-Likely cause: a listed source file changed after `manifest.json` was created, or the manifest digest does not match its file list.
+## JSON Mode Wrote No JSON Document
+
+Symptom: `--format json` exits non-zero and stdout has no JSON result.
+
+Likely cause: the command failed before it could construct a result, such as invalid arguments, missing config, unreadable secrets, or source setup failure.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor run --config <config-path> --format json
+```
+
+Safe fix: read stderr, fix the setup problem, then rerun. Partial destination failures during `run` can produce JSON; fatal setup failures do not.
+
+Reference: [CLI](cli.md#output-and-exit-behavior).
+
+## Source Pipeline Is Not Found
+
+Symptom: `pipeline "<id>" not found`.
+
+Likely cause: configured source diagnostics or upload processing selected a pipeline id that is absent from the loaded config.
+
+Diagnostic:
+
+```sh
+rg -n "id:" <config-path>
+```
+
+Safe fix: pass an existing `--pipeline` value or correct the pipeline id in config.
+
+Reference: [Configuration](config.md#pipelines).
+
+## Source Bundles Are Not Found
+
+Symptom: `no bundles found`, `no bundles found under "."`, `stat ssh ... not_found`, or `stat s3 ... not_found`.
+
+Likely cause: the source root, source-root-relative bundle path, S3 prefix, SSH path, or permissions do not expose a directory containing `manifest.json`.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor validate --config <config-path> --pipeline <pipeline-id>
+```
+
+Safe fix: correct the configured source backend root, permissions, prefix, or `--bundle` path. The selected bundle directory must contain `manifest.json`.
+
+Reference: [Operations](operations.md#filesystem-and-storage-layout).
+
+## Source Manifest Or Files Fail Validation
+
+Symptom: `sha256 mismatch`, `size mismatch`, `digest mismatch`, missing manifest fields, or unsafe source paths.
+
+Likely cause: files changed after `manifest.json` was written, the manifest digest is stale, or the producer wrote invalid bundle paths.
 
 Diagnostic:
 
@@ -83,11 +145,15 @@ Diagnostic:
 go run ./cmd/distributor validate <source-root>
 ```
 
-Safe fix: regenerate the producer bundle and manifest together. Do not edit destination state to work around source digest failures.
+Safe fix: regenerate the producer bundle and manifest together. Do not edit destination state to work around source validation failures.
 
-## `destination has content but no distributor state`
+Reference: [Operations](operations.md#cleanup-and-recovery).
 
-Likely cause: the destination path is not empty and has no `.distributor.json` state file, so `distributor` will not claim it as managed.
+## Destination Has Unmanaged Content
+
+Symptom: `destination has content but no distributor state` or a plan reason containing `fail_unmanaged`.
+
+Likely cause: the destination bundle path contains files but no valid `.distributor.json`, so `distributor` will not claim it by default.
 
 Diagnostic:
 
@@ -95,11 +161,15 @@ Diagnostic:
 find <destination-path> -maxdepth 2 -print
 ```
 
-Safe fix: choose an empty destination path or move existing files aside after confirming they are not needed. There is no force overwrite option.
+Safe fix: choose an empty destination path, move unrelated files aside, or preview `run --dry-run --force` only after confirming the reported bundle path is safe to replace.
 
-## `fail_conflict`
+Reference: [Operations](operations.md#forced-replacement-workflow).
 
-Likely cause: existing `.distributor.json` belongs to a different pipeline, a different destination, a different source id, or a same-created source with a different digest.
+## Destination State Conflicts With Source
+
+Symptom: `fail_conflict`, `destination source id differs`, `same id and created time but different digest`, `pipeline id ... does not match`, or `destination id ... does not match`.
+
+Likely cause: `.distributor.json` belongs to a different pipeline, destination, source id, or same-created source with different content.
 
 Diagnostic:
 
@@ -108,11 +178,47 @@ cat <destination-path>/.distributor.json
 go run ./cmd/distributor inspect <source-root>
 ```
 
-Safe fix: verify you are publishing the intended source to the intended destination. Use a separate destination path for unrelated content.
+Safe fix: verify the source and destination are intended to match. Use a separate destination path for unrelated content. To replace the existing state, configure `transfer.on_conflict: replace`, preview with `--dry-run --force`, then publish with `--force`.
 
-## `destination output path collision`
+Reference: [Operations](operations.md#destination-state-and-retry-behavior).
 
-Likely cause: configured publication would write two outputs to the same destination path, such as publishing a source `report.html` while also generating `report.html` from `report.md`.
+## Destination Is Newer Than Source
+
+Symptom: `skip_destination_newer` or `destination is newer and replacement requires --force`.
+
+Likely cause: the destination state records a source manifest with a later `created` timestamp than the current source.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor run --config <config-path> --dry-run --format json
+```
+
+Safe fix: keep the default skip behavior unless replacement is intentional. To replace newer state, configure `transfer.on_destination_newer: replace`, preview with `--dry-run --force`, then publish with `--force`.
+
+Reference: [Operations](operations.md#forced-replacement-workflow).
+
+## Forced Replacement Appears In A Plan
+
+Symptom: dry-run output includes `force_replace`.
+
+Likely cause: the run used `--force`, and planning selected a supported destructive replacement.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor run --config <config-path> --dry-run --force
+```
+
+Safe fix: inspect the pipeline id, destination id, backend, and bundle path. Proceed only if deleting everything inside that destination bundle path is intended.
+
+Reference: [Operations](operations.md#forced-replacement-workflow).
+
+## Output Path Collision
+
+Symptom: `destination output path collision`.
+
+Likely cause: publication would write two outputs to the same destination path, such as copying `report.html` while also generating `report.html` from `report.md`.
 
 Diagnostic:
 
@@ -120,11 +226,15 @@ Diagnostic:
 go run ./cmd/distributor run --config <config-path> --dry-run
 ```
 
-Safe fix: adjust the source bundle contents or publish policy so source and generated outputs do not collide.
+Safe fix: adjust source files or publish/transform policy so copied and generated outputs do not collide.
 
-## A run failed after writing some files
+Reference: [Configuration](config.md#publish-and-transform-policy).
 
-Likely cause: a write failed partway through publication. Local execution attempts to clean up outputs written during the failed attempt.
+## Run Failed After Writing Some Files
+
+Symptom: a destination write failed and the command exited non-zero after partial work.
+
+Likely cause: storage write failure, permission issue, network interruption, or object-store error during publish execution.
 
 Diagnostic:
 
@@ -132,4 +242,228 @@ Diagnostic:
 find <destination-path> -maxdepth 2 -print
 ```
 
-Safe fix: inspect the destination before retrying. If only unrelated unmanaged files remain, move them aside or choose a clean destination. Re-run with `--dry-run` before publishing again. See [operations](operations.md).
+Safe fix: inspect the destination bundle path printed in the error. `distributor` attempts to remove outputs from the failed attempt, but operators should verify the destination before retrying. Rerun `--dry-run` before publishing again.
+
+Reference: [Operations](operations.md#destination-state-and-retry-behavior).
+
+## JSON Run Result Has `ok: false`
+
+Symptom: `run --format json` exits non-zero with a JSON result where `ok` is `false`.
+
+Likely cause: at least one destination failed after planning or execution began, while other destination results were still available.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor run --config <config-path> --format json
+```
+
+Safe fix: inspect the top-level `errors` array, destination actions, output errors, and summary. Fix failed destinations, then preview with `--dry-run --format json`.
+
+Reference: [CLI](cli.md#output-and-exit-behavior).
+
+## Secrets Directory Is Missing Or Unreadable
+
+Symptom: `load secrets directory ... no such file or directory`, `permission denied`, or `secret filename ... is invalid`.
+
+Likely cause: `secrets.directory` points to a missing or unreadable directory, or it contains a regular file whose name is not a valid credential variable name.
+
+Diagnostic:
+
+```sh
+ls -ld <secrets-directory>
+find <secrets-directory> -maxdepth 1 -type f -printf '%f\n'
+```
+
+Safe fix: mount or create the directory, adjust permissions for the service user, or rename/remove invalid secret files. Secret filenames must match `[A-Za-z_][A-Za-z0-9_]*`.
+
+Reference: [Configuration](config.md#secrets).
+
+## Credential Variable Is Missing Or Empty
+
+Symptom: `credential environment variable ... is not set`, `credential environment variable ... is empty`, or S3 authentication errors such as `AccessDenied`, `InvalidAccessKeyId`, or `SignatureDoesNotMatch`.
+
+Likely cause: configured S3 credential variable names are not available through the process environment or `secrets.directory`, are empty, or do not authorize the requested bucket/prefix.
+
+Diagnostic:
+
+```sh
+env | cut -d= -f1 | rg '^(<access-key-variable>|<secret-key-variable>)$'
+ls -l <secrets-directory>
+```
+
+Safe fix: provide both configured S3 credential values, correct IAM/service permissions, or omit explicit credential fields to use the AWS SDK default credential chain.
+
+Reference: [Configuration](config.md#s3-compatible-backend).
+
+## Secret File Is Ignored In Favor Of Environment
+
+Symptom: `secret ... ignored because the real environment already has that variable`.
+
+Likely cause: the same credential name exists in the process environment and `secrets.directory` with different values.
+
+Diagnostic:
+
+```sh
+env | cut -d= -f1 | rg '^<variable-name>$'
+ls -l <secrets-directory>/<variable-name>
+```
+
+Safe fix: remove one source of the credential or intentionally keep the process environment value. `distributor` does not print either value.
+
+Reference: [Operations](operations.md#secrets-operation).
+
+## SSH Auth Is Not Configured
+
+Symptom: `no SSH auth methods configured`.
+
+Likely cause: no SSH agent is available and `ssh_key_file` is missing or unreadable.
+
+Diagnostic:
+
+```sh
+test -n "$SSH_AUTH_SOCK" && ssh-add -l
+ls -l <ssh-key-file>
+```
+
+Safe fix: start an SSH agent with an appropriate key loaded, or configure a readable private key with `ssh_key_file`.
+
+Reference: [Configuration](config.md#sshsftp-backend).
+
+## SSH Host Key Fails
+
+Symptom: `host key ... is unknown`, `known_hosts is required`, or `host key ... has changed`.
+
+Likely cause: strict host key checking has no trusted key, `accept-new` cannot persist a new key, or the remote host key differs from the stored key.
+
+Diagnostic:
+
+```sh
+ls -l <known-hosts-path>
+ssh-keygen -F <host> -f <known-hosts-path>
+```
+
+Safe fix: pre-populate `known_hosts` for `strict`, configure a writable `known_hosts` path for `accept-new`, or verify the server identity before updating a changed key. Do not disable host key checking to bypass an unexpected changed key.
+
+Reference: [Operations](operations.md#sshsftp).
+
+## S3 Prefix Is Invalid
+
+Symptom: `prefix must be a clean relative slash-separated path`.
+
+Likely cause: the S3 prefix contains traversal, dot segments, empty segments, or backslashes after leading and trailing slashes are trimmed.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor run --config <config-path> --dry-run
+```
+
+Safe fix: use a clean relative prefix such as `reports/archive`, or omit `prefix`.
+
+Reference: [Configuration](config.md#s3-compatible-backend).
+
+## S3 Location Or Connectivity Fails
+
+Symptom: `NoSuchBucket`, `InvalidBucketName`, `not_found`, endpoint connection failures, or TLS/network errors.
+
+Likely cause: endpoint, bucket, prefix, region, path-style mode, network routing, or credentials are wrong for the service.
+
+Diagnostic:
+
+```sh
+go run ./cmd/distributor run --config <config-path> --dry-run
+curl -I <endpoint>
+```
+
+Safe fix: verify `endpoint`, `bucket`, `region`, `prefix`, and `force_path_style`. For S3-compatible services, keep `force_path_style: true` unless the service requires virtual-host addressing. Distributor does not provide an insecure TLS bypass setting.
+
+Reference: [Operations](operations.md#s3-compatible-storage).
+
+## HTTP Server Cannot Bind
+
+Symptom: `bind HTTP server ... address already in use`.
+
+Likely cause: another process is listening on `server.http.bind`.
+
+Diagnostic:
+
+```sh
+ss -ltnp | rg '<port>'
+```
+
+Safe fix: stop the conflicting process or configure a different bind address.
+
+Reference: [Configuration](config.md#serverhttp).
+
+## HTTP Upload Token Is Missing Or Duplicated
+
+Symptom: `upload token environment variable ... is not set`, `... is empty`, or `upload token environment variables ... resolve to the same value`.
+
+Likely cause: an `http_upload` source references a missing/empty `token_env`, or two upload pipelines resolve to the same bearer token.
+
+Diagnostic:
+
+```sh
+rg -n 'token_env:' <config-path>
+env | cut -d= -f1 | rg '^<token-variable>$'
+ls -l <secrets-directory>/<token-variable>
+```
+
+Safe fix: provide one distinct non-empty token value per upload pipeline through the process environment or `secrets.directory`. Do not put literal tokens in YAML.
+
+Reference: [Configuration](config.md#http-upload-source-backend).
+
+## Upload Request Is Unauthorized
+
+Symptom: `POST /upload` returns `401`.
+
+Likely cause: the request lacks `Authorization: Bearer <token>`, has an empty token, or uses a token that does not match any configured upload pipeline.
+
+Diagnostic:
+
+```sh
+curl -i -X POST http://127.0.0.1:8080/upload \
+  -H "Authorization: Bearer $DISTRIBUTOR_UPLOAD_TOKEN" \
+  -H "Content-Type: application/x-tar" \
+  --data-binary @bundle.tar
+```
+
+Safe fix: use the token value resolved by the configured `token_env`. Do not include token values in logs or tickets.
+
+Reference: [Operations](operations.md#http-upload-operation).
+
+## Upload Request Is Rejected Before A Run ID
+
+Symptom: `POST /upload` returns `400`, `413`, `415`, or `503`.
+
+Likely cause: the request included a `pipeline` or `pipeline_id` query, archive content is malformed, the body exceeds size limits, content type is unsupported, or the in-memory upload queue is full.
+
+Diagnostic:
+
+```sh
+tar -tf bundle.tar
+tar -tzf bundle.tar.gz
+rg -n 'max_upload_size|queue_size|max_concurrency' <config-path>
+```
+
+Safe fix: send one valid tar or tar.gz source bundle archive with `Content-Type: application/x-tar`, `application/gzip`, or `application/x-gzip`; remove pipeline query parameters; reduce archive size or raise the configured limit; retry after queue pressure drops.
+
+Reference: [Operations](operations.md#http-upload-operation).
+
+## Upload Status Is Missing
+
+Symptom: `GET /runs/<run_id>` returns `404`.
+
+Likely cause: the run id is wrong, the process restarted, or the retained status record expired after `server.http.retention`.
+
+Diagnostic:
+
+```sh
+curl -i http://127.0.0.1:8080/runs/<run-id>
+rg -n 'retention:' <config-path>
+```
+
+Safe fix: use the exact `run_id` returned by upload admission. Increase retention if operators need a longer status window.
+
+Reference: [Operations](operations.md#http-upload-operation).

examples/archive-and-latest.yml

@@ -0,0 +1,29 @@
+pipelines:
+  - id: example-archive-and-latest
+    source:
+      backend: local
+      path: examples/source-bundle
+    destinations:
+      - id: local-source-archive
+        backend: local
+        path: workspace/published/archive-and-latest/archive
+        path_mapping:
+          mode: preserve_relative
+        publish:
+          source: true
+          html: false
+      - id: local-html-latest
+        backend: local
+        path: workspace/published/archive-and-latest/latest
+        path_mapping:
+          mode: fixed
+        links:
+          base_url: https://reports.example.com/latest
+          primary: auto
+        publish:
+          source: false
+          html: true
+        transform:
+          markdown_to_html:
+            enabled: true
+            mode: index

examples/http-upload-local.yml

@@ -0,0 +1,24 @@
+# Local HTTP upload example.
+# Set DISTRIBUTOR_EXAMPLE_UPLOAD_TOKEN in the process environment or provide a
+# secrets-directory file with that name before running `distributor serve`.
+server:
+  http:
+    bind: 127.0.0.1:8080
+    staging_root: workspace/http-upload/staging
+    max_upload_size: 20MB
+    queue_size: 16
+    max_concurrency: 1
+    retention: 24h
+pipelines:
+  - id: example-http-upload
+    source:
+      backend: http_upload
+      token_env: DISTRIBUTOR_EXAMPLE_UPLOAD_TOKEN
+    destinations:
+      - id: local-archive
+        backend: local
+        path: workspace/published/http-upload
+        publish:
+          source: true
+          html: false
+

examples/local-index.yml

@@ -0,0 +1,16 @@
+pipelines:
+  - id: example-index-bundle
+    source:
+      backend: local
+      path: examples/source-bundle
+    destinations:
+      - id: local-index
+        backend: local
+        path: workspace/published/index-bundle
+        publish:
+          source: false
+          html: true
+        transform:
+          markdown_to_html:
+            enabled: true
+            mode: index

examples/s3-destination.yml

@@ -0,0 +1,22 @@
+# Environment-gated example.
+# Replace endpoint, bucket, prefix, and credential environment variable names
+# with values for an S3-compatible service you control before running this config.
+pipelines:
+  - id: example-s3-destination
+    source:
+      backend: local
+      path: examples/source-bundle
+    destinations:
+      - id: s3-archive
+        backend: s3
+        endpoint: https://s3.example.com
+        bucket: reports
+        prefix: distributor/archive
+        region: us-east-1
+        force_path_style: true
+        credentials:
+          access_key_id_env: DISTRIBUTOR_S3_ACCESS_KEY_ID
+          secret_access_key_env: DISTRIBUTOR_S3_SECRET_ACCESS_KEY
+        publish:
+          source: true
+          html: false

examples/ssh-destination.yml

@@ -0,0 +1,21 @@
+# Environment-gated example.
+# Replace host, user, path, ssh_key_file, and known_hosts with values for an
+# SSH/SFTP endpoint you control before running this config.
+pipelines:
+  - id: example-ssh-destination
+    source:
+      backend: local
+      path: examples/source-bundle
+    destinations:
+      - id: ssh-archive
+        backend: ssh
+        host: ssh.example.com
+        user: distributor
+        port: 22
+        path: /srv/distributor/archive
+        ssh_key_file: /home/distributor/.ssh/id_ed25519
+        known_hosts: /home/distributor/.ssh/known_hosts
+        host_key_policy: strict
+        publish:
+          source: true
+          html: false

go.mod

@@ -3,6 +3,31 @@ module gitea.maximumdirect.net/eric/distributor
 go 1.26
 
 require (
+	github.com/aws/aws-sdk-go-v2 v1.41.9
+	github.com/aws/aws-sdk-go-v2/config v1.32.20
+	github.com/aws/aws-sdk-go-v2/credentials v1.19.19
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.102.2
+	github.com/aws/smithy-go v1.26.0
+	github.com/pkg/sftp v1.13.10
 	github.com/yuin/goldmark v1.8.2
+	golang.org/x/crypto v0.52.0
 	gopkg.in/yaml.v3 v3.0.1
 )
+
+require (
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.11 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.25 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.25 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.25 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.26 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.10 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.18 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.25 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.25 // indirect
+	github.com/aws/aws-sdk-go-v2/service/signin v1.1.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.30.19 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.36.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.42.3 // indirect
+	github.com/kr/fs v0.1.0 // indirect
+	golang.org/x/sys v0.45.0 // indirect
+)

go.sum

@@ -1,5 +1,57 @@
+github.com/aws/aws-sdk-go-v2 v1.41.9 h1:/rYeyO2+HrMztAmxAq9++XJtFMqSIpSsNA0yDGALYq4=
+github.com/aws/aws-sdk-go-v2 v1.41.9/go.mod h1:+HsoOEX80qAVUitj1A2DhCNTjmb3edVyuDypb6LNEeo=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.11 h1:h5+3VT69KUBK24grGuuA5saDJTj2IIjLb9au668Fo5I=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.11/go.mod h1:dnakxebH6UwFvcvujL0LVggYQ8nEvBGjU4G/V79Nv94=
+github.com/aws/aws-sdk-go-v2/config v1.32.20 h1:8VMDnWc/kEzxsI/1ngGM9mG81a8IGmIHD8KLcYGwagc=
+github.com/aws/aws-sdk-go-v2/config v1.32.20/go.mod h1:PuwEpciweIXGULWeOeSTXtSbH4CW9mWdWrhdCKQI1sM=
+github.com/aws/aws-sdk-go-v2/credentials v1.19.19 h1:yuFzSV1U0aRNYCQGVaTY2zW2M/L93pYHnXnrJUphYhU=
+github.com/aws/aws-sdk-go-v2/credentials v1.19.19/go.mod h1:7y63L1kGzeoDlJaQ3Z578KrnmfBut96JjvJUzGwR+YE=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.25 h1:0w6dCiO8iez+YKwRhRBlL1CH/E3GTfdkuzrwj1by8vo=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.25/go.mod h1:9FDWUothyr5RCRAHc45XOiVCzUR8n/IhCYX+uVqw6vk=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.25 h1:Uii3frf9ztec/ABM2/FSH9/z7PLzxfpG8h4RpkUFflQ=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.25/go.mod h1:G6kntsA2GorAxDPbap6xgB2F+amSLUF8GJTi7PUoX44=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.25 h1:r1+/l6m+WaUJF9HISEsNOLHSNj5EXYQxK8VX6Cz9NlA=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.25/go.mod h1:cKf+D+NMDK1LndD7BowHbBZPgR9V0/5HubH0PFWvA+c=
+github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.26 h1:A1PmWU2zfkIm9EyFlJncFXL4W4phML+h8KjltUsCvNQ=
+github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.26/go.mod h1:dY4MRzXEizrD4hqtpKvWVGPX7QleSGGVY+EBolo1RmM=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.10 h1:d5/908OJ4bXg8lyjeMPvXetEKqoDoLi5Owy1zNue3yg=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.10/go.mod h1:a57l7Hwh+FWI+we50g5NPJHYUKeJKfXbc4w8SyXu8Ig=
+github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.18 h1:W/EyPFl9A5rXrtoilfwHYEvzHER+K4SpBPtMXi24Mos=
+github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.9.18/go.mod h1:UG50K+pvd/uy6xExbobg0rjqFBFZe6I3l75EPDZw4tg=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.25 h1:dD3dhHNglpd98gs72my22Ndqi1hqQGllFFg1F+twfxg=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.25/go.mod h1:0yAbjPfd64gG7mj85RW+fMEYdfBgCRZw8g/oWcL1pjc=
+github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.25 h1:2pQEbwf+/6EDbiit/GcBE2K4IUpMZymaA0kOz3xK978=
+github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.25/go.mod h1:KvT6NCcQ0EZ+ZkVRrlBMt04Po3ok23YELEp7WimhLhM=
+github.com/aws/aws-sdk-go-v2/service/s3 v1.102.2 h1:ie4ElCmUKS26pzrZcIk/lmt4yWjAqLLcawstyQCh298=
+github.com/aws/aws-sdk-go-v2/service/s3 v1.102.2/go.mod h1:zjsomFeX5duj+4PlMB+o4JoWTIx+G0XMyzjYrUbQkN0=
+github.com/aws/aws-sdk-go-v2/service/signin v1.1.1 h1:1VwbP3qMNfxUDEXWki4rCE5iA+44VA1lokTz9HasGzw=
+github.com/aws/aws-sdk-go-v2/service/signin v1.1.1/go.mod h1:vUtyoSj0OPji3kjIVSc/GlKuWEiL33f/WFxl6dmpy/A=
+github.com/aws/aws-sdk-go-v2/service/sso v1.30.19 h1:N6pIsdFOW1Kd9S4KyFKXdGRBojPPxkP32+uHFWLv4Hc=
+github.com/aws/aws-sdk-go-v2/service/sso v1.30.19/go.mod h1:3gt5WJArFooNmyLONS+h/R4J+o86II8du38IgCwj9dE=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.36.2 h1:hc+lBYiiTr8Zk4MTzIsQ92MeDWCIDvWGmzKUWOaBcOg=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.36.2/go.mod h1:hU6fqB3OJA6/ePheD47LQnxvjYk6br6PtQxs+Q9ojvk=
+github.com/aws/aws-sdk-go-v2/service/sts v1.42.3 h1:ErklX/7uhSbkAAeyQD/Y1OoQ9hO3SJXQNEgksORW3Js=
+github.com/aws/aws-sdk-go-v2/service/sts v1.42.3/go.mod h1:ULe4HCzfKPiR6R3HEurE3b1upEkuk8AkMrOKtaOxKO8=
+github.com/aws/smithy-go v1.26.0 h1:9ouqbi+NyKP7fV3Te7UElCwdAb6Y8uk7LGwPE5tVe/s=
+github.com/aws/smithy-go v1.26.0/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
+github.com/pkg/sftp v1.13.10 h1:+5FbKNTe5Z9aspU88DPIKJ9z2KZoaGCu6Sr6kKR/5mU=
+github.com/pkg/sftp v1.13.10/go.mod h1:bJ1a7uDhrX/4OII+agvy28lzRvQrmIQuaHrcI1HbeGA=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/yuin/goldmark v1.8.2 h1:kEGpgqJXdgbkhcOgBxkC0X0PmoPG1ZyoZ117rDVp4zE=
 github.com/yuin/goldmark v1.8.2/go.mod h1:ip/1k0VRfGynBgxOz0yCqHrbZXhcjxyuS66Brc7iBKg=
+golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
+golang.org/x/crypto v0.52.0/go.mod h1:1QgfPxDqh0T2M/elOJtp9RvuR95kVjir0e6/BvEmGbc=
+golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
+golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/term v0.43.0 h1:S4RLU2sB31O/NCl+zFN9Aru9A/Cq2aqKpTZJ6B+DwT4=
+golang.org/x/term v0.43.0/go.mod h1:lrhlHNdQJHO+1qVYiHfFKVuVioJIheAc3fBSMFYEIsk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

internal/adapters/local/backend.go

@@ -161,31 +161,10 @@ func (b *Backend) Walk(ctx context.Context, prefix string, opts storage.WalkOpti
 		}
 		return b.translateError(storage.OpWalk, prefix, err)
 	}
-	visited := 0
-	emit := func(entry storage.Entry) error {
-		if err := ctx.Err(); err != nil {
-			return err
-		}
-		if opts.Limit > 0 && visited >= opts.Limit {
-			return storage.ErrStopWalk
-		}
-		visited++
-		if err := fn(entry); err != nil {
-			if errors.Is(err, storage.ErrStopWalk) {
-				return storage.ErrStopWalk
-			}
-			return storage.NewError(storage.OpWalk, backendName, entry.Path, storage.ErrUnknown, err)
-		}
-		return nil
-	}
+	emitter := storage.NewWalkEmitter(ctx, backendName, opts, fn)
 
 	if !info.IsDir() {
-		if err := emit(entryFromInfo(prefix, info)); errors.Is(err, storage.ErrStopWalk) {
-			return nil
-		} else if err != nil {
-			return err
-		}
-		return nil
+		return storage.FinishWalk(emitter.Emit(entryFromInfo(prefix, info)))
 	}
 
 	walkErr := filepath.WalkDir(nativePrefix, func(nativePath string, dirEntry fs.DirEntry, err error) error {
@@ -210,24 +189,13 @@ func (b *Backend) Walk(ctx context.Context, prefix string, opts storage.WalkOpti
 		if err != nil {
 			return b.translateError(storage.OpWalk, logicalPath, err)
 		}
-		return emit(entryFromInfo(logicalPath, info))
+		return emitter.Emit(entryFromInfo(logicalPath, info))
 	})
-	if errors.Is(walkErr, storage.ErrStopWalk) {
-		return nil
-	}
-	return walkErr
+	return storage.FinishWalk(walkErr)
 }
 
 func (b *Backend) HasAny(ctx context.Context, prefix string) (bool, error) {
-	found := false
-	err := b.Walk(ctx, prefix, storage.WalkOptions{Recursive: false, Limit: 1}, func(storage.Entry) error {
-		found = true
-		return storage.ErrStopWalk
-	})
-	if err != nil {
-		return false, err
-	}
-	return found, nil
+	return storage.HasAny(ctx, b, prefix)
 }
 
 func (b *Backend) DeleteManagedBundle(ctx context.Context, bundlePath string, managedOutputPaths []string, opts storage.DeleteOptions) error {
@@ -267,6 +235,51 @@ func (b *Backend) DeleteManagedBundle(ctx context.Context, bundlePath string, ma
 	return nil
 }
 
+func (b *Backend) DeletePrefix(ctx context.Context, prefix string, opts storage.DeleteOptions) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	nativePrefix, err := b.nativePath(prefix, true)
+	if err != nil {
+		return err
+	}
+	if err := b.rejectSymlinkAncestors(nativePrefix, false); err != nil {
+		return err
+	}
+	if prefix == "" {
+		entries, err := os.ReadDir(nativePrefix)
+		if err != nil {
+			if opts.IgnoreMissing && errors.Is(err, fs.ErrNotExist) {
+				return nil
+			}
+			return b.translateError(storage.OpDeletePrefix, prefix, err)
+		}
+		for _, entry := range entries {
+			if err := ctx.Err(); err != nil {
+				return err
+			}
+			child := filepath.Join(nativePrefix, entry.Name())
+			if err := os.RemoveAll(child); err != nil {
+				return b.translateError(storage.OpDeletePrefix, entry.Name(), err)
+			}
+		}
+		return nil
+	}
+	if _, err := os.Lstat(nativePrefix); err != nil {
+		if opts.IgnoreMissing && errors.Is(err, fs.ErrNotExist) {
+			return nil
+		}
+		return b.translateError(storage.OpDeletePrefix, prefix, err)
+	}
+	if err := os.RemoveAll(nativePrefix); err != nil {
+		return b.translateError(storage.OpDeletePrefix, prefix, err)
+	}
+	if opts.PruneEmptyDirs {
+		b.pruneEmptyParents(filepath.Dir(nativePrefix))
+	}
+	return nil
+}
+
 func (b *Backend) nativePath(logicalPath string, allowEmpty bool) (string, error) {
 	if logicalPath == "" {
 		if !allowEmpty {

internal/adapters/local/backend_test.go

@@ -169,6 +169,30 @@ func TestBackendManagedDeletion(t *testing.T) {
 	}
 }
 
+func TestBackendDeletePrefixStaysWithinPrefix(t *testing.T) {
+	backend := newBackend(t)
+	mustWrite(t, backend, "bundle/report.md", "report")
+	mustWrite(t, backend, "bundle/nested/old.txt", "old")
+	mustWrite(t, backend, "bundle-sibling/keep.txt", "keep")
+	mustWrite(t, backend, "outside.txt", "outside")
+
+	if err := backend.DeletePrefix(context.Background(), "bundle", storage.DeleteOptions{IgnoreMissing: true, PruneEmptyDirs: true}); err != nil {
+		t.Fatalf("DeletePrefix() error = %v", err)
+	}
+	if _, err := backend.Stat(context.Background(), "bundle/report.md"); !storage.IsNotFound(err) {
+		t.Fatalf("deleted file stat error = %v, want not found", err)
+	}
+	if _, err := backend.Stat(context.Background(), "bundle/nested/old.txt"); !storage.IsNotFound(err) {
+		t.Fatalf("deleted nested file stat error = %v, want not found", err)
+	}
+	if _, err := backend.Stat(context.Background(), "bundle-sibling/keep.txt"); err != nil {
+		t.Fatalf("sibling stat error = %v", err)
+	}
+	if _, err := backend.Stat(context.Background(), "outside.txt"); err != nil {
+		t.Fatalf("outside stat error = %v", err)
+	}
+}
+
 func TestBackendHasAny(t *testing.T) {
 	backend := newBackend(t)
 	found, err := backend.HasAny(context.Background(), "missing")

internal/adapters/s3/backend.go

@@ -0,0 +1,455 @@
+package s3
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"path"
+	"sort"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awscfg "github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/credentials"
+	awss3 "github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
+	"github.com/aws/smithy-go"
+)
+
+type Client interface {
+	HeadObject(ctx context.Context, input *awss3.HeadObjectInput, optFns ...func(*awss3.Options)) (*awss3.HeadObjectOutput, error)
+	GetObject(ctx context.Context, input *awss3.GetObjectInput, optFns ...func(*awss3.Options)) (*awss3.GetObjectOutput, error)
+	PutObject(ctx context.Context, input *awss3.PutObjectInput, optFns ...func(*awss3.Options)) (*awss3.PutObjectOutput, error)
+	ListObjectsV2(ctx context.Context, input *awss3.ListObjectsV2Input, optFns ...func(*awss3.Options)) (*awss3.ListObjectsV2Output, error)
+	DeleteObject(ctx context.Context, input *awss3.DeleteObjectInput, optFns ...func(*awss3.Options)) (*awss3.DeleteObjectOutput, error)
+}
+
+type Backend struct {
+	client Client
+	bucket string
+	prefix string
+}
+
+func New(ctx context.Context, options Options) (*Backend, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	options, err := options.normalized()
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.Prefix, storage.ErrInvalidPath, err)
+	}
+	loadOptions := []func(*awscfg.LoadOptions) error{
+		awscfg.WithRegion(options.Region),
+	}
+	if options.AccessKeyID != "" {
+		loadOptions = append(loadOptions, awscfg.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(options.AccessKeyID, options.SecretAccessKey, "")))
+	}
+	cfg, err := awscfg.LoadDefaultConfig(ctx, loadOptions...)
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.Endpoint, storage.ErrUnknown, err)
+	}
+	client := awss3.NewFromConfig(cfg, func(o *awss3.Options) {
+		o.BaseEndpoint = aws.String(options.Endpoint)
+		o.UsePathStyle = options.ForcePathStyle
+	})
+	return NewWithClient(client, options)
+}
+
+func NewWithClient(client Client, options Options) (*Backend, error) {
+	options, err := options.normalized()
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.Prefix, storage.ErrInvalidPath, err)
+	}
+	if client == nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.Bucket, storage.ErrInvalidPath, fmt.Errorf("client is required"))
+	}
+	return &Backend{
+		client: client,
+		bucket: options.Bucket,
+		prefix: options.Prefix,
+	}, nil
+}
+
+func (b *Backend) ReadFile(ctx context.Context, logicalPath string) ([]byte, error) {
+	reader, err := b.OpenReader(ctx, logicalPath)
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, storage.NewError(storage.OpReadFile, BackendName, logicalPath, storage.ErrUnknown, err)
+	}
+	return data, nil
+}
+
+func (b *Backend) OpenReader(ctx context.Context, logicalPath string) (io.ReadCloser, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	key, err := b.objectKey(logicalPath, false)
+	if err != nil {
+		return nil, err
+	}
+	output, err := b.client.GetObject(ctx, &awss3.GetObjectInput{
+		Bucket: aws.String(b.bucket),
+		Key:    aws.String(key),
+	})
+	if err != nil {
+		return nil, b.translateError(storage.OpOpenReader, logicalPath, err)
+	}
+	return output.Body, nil
+}
+
+func (b *Backend) WriteFile(ctx context.Context, logicalPath string, data []byte, opts storage.WriteOptions) (storage.Entry, error) {
+	opts.Size = int64(len(data))
+	opts.SizeKnown = true
+	return b.WriteFrom(ctx, logicalPath, bytes.NewReader(data), opts)
+}
+
+func (b *Backend) WriteFrom(ctx context.Context, logicalPath string, r io.Reader, opts storage.WriteOptions) (storage.Entry, error) {
+	if err := ctx.Err(); err != nil {
+		return storage.Entry{}, err
+	}
+	key, err := b.objectKey(logicalPath, false)
+	if err != nil {
+		return storage.Entry{}, err
+	}
+	if !opts.Overwrite {
+		_, err := b.client.HeadObject(ctx, &awss3.HeadObjectInput{
+			Bucket: aws.String(b.bucket),
+			Key:    aws.String(key),
+		})
+		if err == nil {
+			return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrAlreadyExist, nil)
+		}
+		if !isNotFound(err) {
+			return storage.Entry{}, b.translateError(storage.OpWriteFrom, logicalPath, err)
+		}
+	}
+	data, err := io.ReadAll(r)
+	if err != nil {
+		return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrUnknown, err)
+	}
+	if opts.SizeKnown && int64(len(data)) != opts.Size {
+		return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrConflict, fmt.Errorf("stream size %d does not match expected size %d", len(data), opts.Size))
+	}
+	contentType := opts.ContentType
+	if contentType == "" {
+		contentType = ContentType(logicalPath)
+	}
+	_, err = b.client.PutObject(ctx, &awss3.PutObjectInput{
+		Bucket:        aws.String(b.bucket),
+		Key:           aws.String(key),
+		Body:          bytes.NewReader(data),
+		ContentLength: aws.Int64(int64(len(data))),
+		ContentType:   aws.String(contentType),
+	})
+	if err != nil {
+		return storage.Entry{}, b.translateError(storage.OpWriteFrom, logicalPath, err)
+	}
+	return storage.Entry{Path: logicalPath, Type: storage.EntryTypeFile, Size: int64(len(data))}, nil
+}
+
+func (b *Backend) Stat(ctx context.Context, logicalPath string) (storage.Entry, error) {
+	if err := ctx.Err(); err != nil {
+		return storage.Entry{}, err
+	}
+	key, err := b.objectKey(logicalPath, false)
+	if err != nil {
+		return storage.Entry{}, err
+	}
+	output, err := b.client.HeadObject(ctx, &awss3.HeadObjectInput{
+		Bucket: aws.String(b.bucket),
+		Key:    aws.String(key),
+	})
+	if err != nil {
+		return storage.Entry{}, b.translateError(storage.OpStat, logicalPath, err)
+	}
+	size := int64(0)
+	if output.ContentLength != nil {
+		size = *output.ContentLength
+	}
+	return storage.Entry{Path: logicalPath, Type: storage.EntryTypeFile, Size: size}, nil
+}
+
+func (b *Backend) Walk(ctx context.Context, logicalPrefix string, opts storage.WalkOptions, fn storage.WalkFunc) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	if err := storage.ValidatePrefix(logicalPrefix); err != nil {
+		return err
+	}
+	emitter := storage.NewWalkEmitter(ctx, BackendName, opts, fn)
+	if logicalPrefix != "" {
+		entry, err := b.Stat(ctx, logicalPrefix)
+		if err == nil {
+			if err := emitter.Emit(entry); err != nil {
+				return storage.FinishWalk(err)
+			}
+			if emitter.LimitReached() {
+				return nil
+			}
+		} else if !storage.IsNotFound(err) {
+			return err
+		}
+	}
+	return storage.FinishWalk(b.walkObjects(ctx, logicalPrefix, opts, emitter.Emit))
+}
+
+func (b *Backend) HasAny(ctx context.Context, logicalPrefix string) (bool, error) {
+	return storage.HasAny(ctx, b, logicalPrefix)
+}
+
+func (b *Backend) DeleteManagedBundle(ctx context.Context, bundlePath string, managedOutputPaths []string, opts storage.DeleteOptions) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	targets, err := storage.ManagedBundleTargets(bundlePath, managedOutputPaths)
+	if err != nil {
+		return err
+	}
+	for _, target := range targets {
+		if err := b.deleteObject(ctx, storage.OpDeleteManagedBundle, target, opts); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (b *Backend) DeletePrefix(ctx context.Context, logicalPrefix string, opts storage.DeleteOptions) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	if err := storage.ValidatePrefix(logicalPrefix); err != nil {
+		return err
+	}
+	found := false
+	if logicalPrefix != "" {
+		key, err := b.objectKey(logicalPrefix, false)
+		if err != nil {
+			return err
+		}
+		_, err = b.client.HeadObject(ctx, &awss3.HeadObjectInput{
+			Bucket: aws.String(b.bucket),
+			Key:    aws.String(key),
+		})
+		if err == nil {
+			found = true
+			if err := b.deleteObject(ctx, storage.OpDeletePrefix, logicalPrefix, storage.DeleteOptions{IgnoreMissing: false}); err != nil {
+				return err
+			}
+		} else if !isNotFound(err) {
+			return b.translateError(storage.OpDeletePrefix, logicalPrefix, err)
+		}
+	}
+	var entries []storage.Entry
+	if err := b.walkObjects(ctx, logicalPrefix, storage.WalkOptions{Recursive: true}, func(entry storage.Entry) error {
+		if entry.Type == storage.EntryTypeFile {
+			entries = append(entries, entry)
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+	for _, entry := range entries {
+		found = true
+		if err := b.deleteObject(ctx, storage.OpDeletePrefix, entry.Path, storage.DeleteOptions{IgnoreMissing: true}); err != nil {
+			return err
+		}
+	}
+	if !found && !opts.IgnoreMissing {
+		return storage.NewError(storage.OpDeletePrefix, BackendName, logicalPrefix, storage.ErrNotFound, nil)
+	}
+	return nil
+}
+
+func (b *Backend) deleteObject(ctx context.Context, op, logicalPath string, opts storage.DeleteOptions) error {
+	key, err := b.objectKey(logicalPath, false)
+	if err != nil {
+		return err
+	}
+	if key == b.prefix {
+		return storage.NewError(op, BackendName, logicalPath, storage.ErrInvalidPath, nil)
+	}
+	if !opts.IgnoreMissing {
+		_, err := b.client.HeadObject(ctx, &awss3.HeadObjectInput{
+			Bucket: aws.String(b.bucket),
+			Key:    aws.String(key),
+		})
+		if err != nil {
+			return b.translateError(op, logicalPath, err)
+		}
+	}
+	_, err = b.client.DeleteObject(ctx, &awss3.DeleteObjectInput{
+		Bucket: aws.String(b.bucket),
+		Key:    aws.String(key),
+	})
+	if err != nil {
+		if opts.IgnoreMissing && isNotFound(err) {
+			return nil
+		}
+		return b.translateError(op, logicalPath, err)
+	}
+	return nil
+}
+
+func (b *Backend) walkObjects(ctx context.Context, logicalPrefix string, opts storage.WalkOptions, emit func(storage.Entry) error) error {
+	listPrefix, err := b.listPrefix(logicalPrefix)
+	if err != nil {
+		return err
+	}
+	delimiter := ""
+	if !opts.Recursive {
+		delimiter = "/"
+	}
+	var token *string
+	for {
+		output, err := b.client.ListObjectsV2(ctx, &awss3.ListObjectsV2Input{
+			Bucket:            aws.String(b.bucket),
+			Prefix:            aws.String(listPrefix),
+			Delimiter:         aws.String(delimiter),
+			ContinuationToken: token,
+		})
+		if err != nil {
+			return b.translateError(storage.OpWalk, logicalPrefix, err)
+		}
+		entries := entriesFromList(logicalPrefix, b.prefix, output)
+		sort.Slice(entries, func(i, j int) bool { return entries[i].Path < entries[j].Path })
+		for _, entry := range entries {
+			if entry.Path == "" {
+				continue
+			}
+			if err := emit(entry); err != nil {
+				return err
+			}
+		}
+		if output.IsTruncated == nil || !*output.IsTruncated {
+			return nil
+		}
+		token = output.NextContinuationToken
+	}
+}
+
+func entriesFromList(logicalPrefix, rootPrefix string, output *awss3.ListObjectsV2Output) []storage.Entry {
+	seen := make(map[string]storage.Entry)
+	for _, object := range output.Contents {
+		if object.Key == nil {
+			continue
+		}
+		logicalPath := logicalPathFromKey(rootPrefix, *object.Key)
+		if logicalPath == "" || logicalPath == logicalPrefix {
+			continue
+		}
+		size := int64(0)
+		if object.Size != nil {
+			size = *object.Size
+		}
+		seen[logicalPath] = storage.Entry{Path: logicalPath, Type: storage.EntryTypeFile, Size: size}
+	}
+	for _, commonPrefix := range output.CommonPrefixes {
+		if commonPrefix.Prefix == nil {
+			continue
+		}
+		logicalPath := strings.TrimSuffix(logicalPathFromKey(rootPrefix, *commonPrefix.Prefix), "/")
+		if logicalPath == "" || logicalPath == logicalPrefix {
+			continue
+		}
+		seen[logicalPath] = storage.Entry{Path: logicalPath, Type: storage.EntryTypeDirectory}
+	}
+	entries := make([]storage.Entry, 0, len(seen))
+	for _, entry := range seen {
+		entries = append(entries, entry)
+	}
+	return entries
+}
+
+func (b *Backend) objectKey(logicalPath string, allowEmpty bool) (string, error) {
+	if logicalPath == "" {
+		if !allowEmpty {
+			return "", storage.NewError(storage.OpValidatePath, BackendName, logicalPath, storage.ErrInvalidPath, nil)
+		}
+		return b.prefix, nil
+	}
+	if err := storage.ValidatePath(logicalPath); err != nil {
+		return "", err
+	}
+	if b.prefix == "" {
+		return logicalPath, nil
+	}
+	return b.prefix + "/" + logicalPath, nil
+}
+
+func (b *Backend) listPrefix(logicalPrefix string) (string, error) {
+	key, err := b.objectKey(logicalPrefix, true)
+	if err != nil {
+		return "", err
+	}
+	if key != "" {
+		key = strings.TrimSuffix(key, "/") + "/"
+	}
+	return key, nil
+}
+
+func logicalPathFromKey(rootPrefix, key string) string {
+	if rootPrefix == "" {
+		return key
+	}
+	if key == rootPrefix {
+		return ""
+	}
+	return strings.TrimPrefix(key, rootPrefix+"/")
+}
+
+func ContentType(logicalPath string) string {
+	switch strings.ToLower(path.Ext(logicalPath)) {
+	case ".md":
+		return "text/markdown; charset=utf-8"
+	case ".html":
+		return "text/html; charset=utf-8"
+	case ".json":
+		return "application/json"
+	case ".txt":
+		return "text/plain; charset=utf-8"
+	default:
+		return "application/octet-stream"
+	}
+}
+
+func isNotFound(err error) bool {
+	var notFound *types.NotFound
+	if errors.As(err, &notFound) {
+		return true
+	}
+	var apiErr smithy.APIError
+	if errors.As(err, &apiErr) {
+		switch apiErr.ErrorCode() {
+		case "NotFound", "NoSuchKey", "404":
+			return true
+		}
+	}
+	return false
+}
+
+func (b *Backend) translateError(op, logicalPath string, err error) error {
+	kind := storage.ErrUnknown
+	if isNotFound(err) {
+		kind = storage.ErrNotFound
+	} else {
+		var apiErr smithy.APIError
+		if errors.As(err, &apiErr) {
+			switch apiErr.ErrorCode() {
+			case "AccessDenied", "InvalidAccessKeyId", "SignatureDoesNotMatch":
+				kind = storage.ErrPermission
+			case "SlowDown", "RequestTimeout", "ServiceUnavailable", "InternalError":
+				kind = storage.ErrTemporary
+			case "InvalidBucketName", "NoSuchBucket":
+				kind = storage.ErrInvalidPath
+			}
+		}
+	}
+	return storage.NewError(op, BackendName, logicalPath, kind, err)
+}

internal/adapters/s3/backend_test.go

@@ -0,0 +1,442 @@
+package s3
+
+import (
+	"context"
+	"io"
+	"sort"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awss3 "github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
+)
+
+func TestKeyAndPrefixNormalization(t *testing.T) {
+	backend := newTestBackend(t, "root/prefix", nil)
+	key, err := backend.objectKey("bundle/report.md", false)
+	if err != nil {
+		t.Fatalf("objectKey() error = %v", err)
+	}
+	if got, want := key, "root/prefix/bundle/report.md"; got != want {
+		t.Fatalf("objectKey() = %q, want %q", got, want)
+	}
+	listPrefix, err := backend.listPrefix("bundle")
+	if err != nil {
+		t.Fatalf("listPrefix() error = %v", err)
+	}
+	if got, want := listPrefix, "root/prefix/bundle/"; got != want {
+		t.Fatalf("listPrefix() = %q, want %q", got, want)
+	}
+}
+
+func TestPathTraversalRejected(t *testing.T) {
+	backend := newTestBackend(t, "", nil)
+	for _, logicalPath := range []string{"/absolute", "../escape", "a/../b", `a\b`} {
+		t.Run(logicalPath, func(t *testing.T) {
+			if _, err := backend.objectKey(logicalPath, false); err == nil || !storage.IsInvalidPath(err) {
+				t.Fatalf("objectKey() error = %v, want invalid path", err)
+			}
+		})
+	}
+}
+
+func TestContentType(t *testing.T) {
+	tests := map[string]string{
+		"report.md":   "text/markdown; charset=utf-8",
+		"report.html": "text/html; charset=utf-8",
+		"state.json":  "application/json",
+		"summary.txt": "text/plain; charset=utf-8",
+		"data.bin":    "application/octet-stream",
+	}
+	for path, want := range tests {
+		if got := ContentType(path); got != want {
+			t.Fatalf("ContentType(%q) = %q, want %q", path, got, want)
+		}
+	}
+}
+
+func TestStatRequiresExactObject(t *testing.T) {
+	client := newFakeClient(map[string]string{"root/dir/file.txt": "data"})
+	backend := newTestBackend(t, "root", client)
+	_, err := backend.Stat(context.Background(), "dir")
+	if err == nil || !storage.IsNotFound(err) {
+		t.Fatalf("Stat() error = %v, want not found", err)
+	}
+}
+
+func TestWalkIncludesExactObjectAndDescendants(t *testing.T) {
+	client := newFakeClient(map[string]string{
+		"root/bundle":           "marker",
+		"root/bundle/report.md": "report",
+	})
+	backend := newTestBackend(t, "root", client)
+	entries, err := storage.List(context.Background(), backend, "bundle", storage.WalkOptions{Recursive: true})
+	if err != nil {
+		t.Fatalf("List() error = %v", err)
+	}
+	paths := entryPaths(entries)
+	if got, want := paths, []string{"bundle", "bundle/report.md"}; !equalStrings(got, want) {
+		t.Fatalf("paths = %v, want %v", got, want)
+	}
+}
+
+func TestWalkExactObjectHonorsLimitBeforeListingDescendants(t *testing.T) {
+	client := newFakeClient(map[string]string{
+		"root/bundle":           "marker",
+		"root/bundle/report.md": "report",
+	})
+	backend := newTestBackend(t, "root", client)
+	var entries []storage.Entry
+	err := backend.Walk(context.Background(), "bundle", storage.WalkOptions{Recursive: true, Limit: 1}, func(entry storage.Entry) error {
+		entries = append(entries, entry)
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("Walk() error = %v", err)
+	}
+	paths := entryPaths(entries)
+	if got, want := paths, []string{"bundle"}; !equalStrings(got, want) {
+		t.Fatalf("paths = %v, want %v", got, want)
+	}
+	if len(client.tokens) != 0 {
+		t.Fatalf("list calls = %d, want none", len(client.tokens))
+	}
+}
+
+func TestHasAnyWithExactObjectStopsBeforeListingDescendants(t *testing.T) {
+	client := newFakeClient(map[string]string{
+		"root/bundle":           "marker",
+		"root/bundle/report.md": "report",
+	})
+	backend := newTestBackend(t, "root", client)
+	found, err := backend.HasAny(context.Background(), "bundle")
+	if err != nil {
+		t.Fatalf("HasAny() error = %v", err)
+	}
+	if !found {
+		t.Fatal("HasAny() = false, want true")
+	}
+	if len(client.tokens) != 0 {
+		t.Fatalf("list calls = %d, want none", len(client.tokens))
+	}
+}
+
+func TestWriteFromChecksOverwriteBeforePut(t *testing.T) {
+	client := newFakeClient(map[string]string{"root/report.md": "old"})
+	backend := newTestBackend(t, "root", client)
+	_, err := backend.WriteFile(context.Background(), "report.md", []byte("new"), storage.WriteOptions{})
+	if err == nil || !storage.IsAlreadyExists(err) {
+		t.Fatalf("WriteFile() error = %v, want already exists", err)
+	}
+	if len(client.putKeys) != 0 {
+		t.Fatalf("put keys = %v, want none", client.putKeys)
+	}
+}
+
+func TestWriteFromPutsNewObjectWithContentType(t *testing.T) {
+	client := newFakeClient(nil)
+	backend := newTestBackend(t, "root", client)
+	entry, err := backend.WriteFile(context.Background(), "report.html", []byte("<p>ok</p>"), storage.WriteOptions{})
+	if err != nil {
+		t.Fatalf("WriteFile() error = %v", err)
+	}
+	if entry.Path != "report.html" || entry.Size != 9 || entry.Type != storage.EntryTypeFile {
+		t.Fatalf("entry = %#v", entry)
+	}
+	if got, want := client.objects["root/report.html"], "<p>ok</p>"; got != want {
+		t.Fatalf("object = %q, want %q", got, want)
+	}
+	if got, want := client.contentTypes["root/report.html"], "text/html; charset=utf-8"; got != want {
+		t.Fatalf("content type = %q, want %q", got, want)
+	}
+}
+
+func TestWalkUsesPagination(t *testing.T) {
+	client := newFakeClient(nil)
+	client.listPages = []awss3.ListObjectsV2Output{
+		{
+			Contents:              []types.Object{{Key: aws.String("root/a.txt"), Size: aws.Int64(1)}},
+			IsTruncated:           aws.Bool(true),
+			NextContinuationToken: aws.String("next"),
+		},
+		{
+			Contents:    []types.Object{{Key: aws.String("root/b.txt"), Size: aws.Int64(2)}},
+			IsTruncated: aws.Bool(false),
+		},
+	}
+	backend := newTestBackend(t, "root", client)
+	entries, err := storage.List(context.Background(), backend, "", storage.WalkOptions{Recursive: true})
+	if err != nil {
+		t.Fatalf("List() error = %v", err)
+	}
+	paths := entryPaths(entries)
+	if got, want := paths, []string{"a.txt", "b.txt"}; !equalStrings(got, want) {
+		t.Fatalf("paths = %v, want %v", got, want)
+	}
+	if got, want := client.tokens, []string{"", "next"}; !equalStrings(got, want) {
+		t.Fatalf("tokens = %v, want %v", got, want)
+	}
+}
+
+func TestHasAnyStopsAfterFirstPage(t *testing.T) {
+	client := newFakeClient(nil)
+	client.listPages = []awss3.ListObjectsV2Output{
+		{
+			Contents:              []types.Object{{Key: aws.String("root/a.txt"), Size: aws.Int64(1)}},
+			IsTruncated:           aws.Bool(true),
+			NextContinuationToken: aws.String("next"),
+		},
+		{
+			Contents:    []types.Object{{Key: aws.String("root/b.txt"), Size: aws.Int64(2)}},
+			IsTruncated: aws.Bool(false),
+		},
+	}
+	backend := newTestBackend(t, "root", client)
+	found, err := backend.HasAny(context.Background(), "")
+	if err != nil {
+		t.Fatalf("HasAny() error = %v", err)
+	}
+	if !found {
+		t.Fatal("HasAny() = false, want true")
+	}
+	if got, want := len(client.tokens), 1; got != want {
+		t.Fatalf("list calls = %d, want %d", got, want)
+	}
+}
+
+func TestWalkNonRecursiveUsesPrefixBoundary(t *testing.T) {
+	client := newFakeClient(map[string]string{
+		"base/dir/file.txt": "nested",
+		"base/file.txt":     "file",
+		"baseball/file.txt": "wrong",
+	})
+	backend := newTestBackend(t, "base", client)
+	entries, err := storage.List(context.Background(), backend, "", storage.WalkOptions{})
+	if err != nil {
+		t.Fatalf("List() error = %v", err)
+	}
+	paths := entryPaths(entries)
+	if got, want := paths, []string{"dir", "file.txt"}; !equalStrings(got, want) {
+		t.Fatalf("paths = %v, want %v", got, want)
+	}
+}
+
+func TestDeleteManagedBundleDeletesOnlyManagedTargets(t *testing.T) {
+	client := newFakeClient(map[string]string{
+		"root/report.md":         "report",
+		"root/.distributor.json": "state",
+		"root/keep.txt":          "keep",
+	})
+	backend := newTestBackend(t, "root", client)
+	err := backend.DeleteManagedBundle(context.Background(), "", []string{"report.md"}, storage.DeleteOptions{IgnoreMissing: true})
+	if err != nil {
+		t.Fatalf("DeleteManagedBundle() error = %v", err)
+	}
+	if _, ok := client.objects["root/report.md"]; ok {
+		t.Fatal("managed output still exists")
+	}
+	if _, ok := client.objects["root/.distributor.json"]; ok {
+		t.Fatal("state file still exists")
+	}
+	if _, ok := client.objects["root/keep.txt"]; !ok {
+		t.Fatal("unmanaged object was deleted")
+	}
+	if got, want := sortedStrings(client.deleteKeys), []string{"root/.distributor.json", "root/report.md"}; !equalStrings(got, want) {
+		t.Fatalf("deleted keys = %v, want %v", got, want)
+	}
+}
+
+func TestDeletePrefixStaysWithinPrefix(t *testing.T) {
+	client := newFakeClient(map[string]string{
+		"root/bundle/report.md":           "report",
+		"root/bundle/nested/old.txt":      "old",
+		"root/bundle-sibling/keep.txt":    "keep",
+		"root/outside.txt":                "outside",
+		"other-root/bundle/report.md":     "other",
+		"root/.distributor-prefix-marker": "marker",
+	})
+	backend := newTestBackend(t, "root", client)
+	if err := backend.DeletePrefix(context.Background(), "bundle", storage.DeleteOptions{IgnoreMissing: true}); err != nil {
+		t.Fatalf("DeletePrefix() error = %v", err)
+	}
+	for _, deleted := range []string{"root/bundle/report.md", "root/bundle/nested/old.txt"} {
+		if _, ok := client.objects[deleted]; ok {
+			t.Fatalf("%s still exists", deleted)
+		}
+	}
+	for _, kept := range []string{"root/bundle-sibling/keep.txt", "root/outside.txt", "other-root/bundle/report.md", "root/.distributor-prefix-marker"} {
+		if _, ok := client.objects[kept]; !ok {
+			t.Fatalf("%s was deleted", kept)
+		}
+	}
+	if got, want := sortedStrings(client.deleteKeys), []string{"root/bundle/nested/old.txt", "root/bundle/report.md"}; !equalStrings(got, want) {
+		t.Fatalf("deleted keys = %v, want %v", got, want)
+	}
+}
+
+func newTestBackend(t *testing.T, prefix string, client *fakeClient) *Backend {
+	t.Helper()
+	if client == nil {
+		client = newFakeClient(nil)
+	}
+	backend, err := NewWithClient(client, Options{
+		Endpoint:       "https://s3.example.com",
+		Bucket:         "reports",
+		Prefix:         prefix,
+		Region:         DefaultRegion,
+		ForcePathStyle: true,
+	})
+	if err != nil {
+		t.Fatalf("NewWithClient() error = %v", err)
+	}
+	return backend
+}
+
+type fakeClient struct {
+	objects      map[string]string
+	contentTypes map[string]string
+	listPages    []awss3.ListObjectsV2Output
+	tokens       []string
+	putKeys      []string
+	deleteKeys   []string
+}
+
+func newFakeClient(objects map[string]string) *fakeClient {
+	copied := make(map[string]string)
+	for key, value := range objects {
+		copied[key] = value
+	}
+	return &fakeClient{
+		objects:      copied,
+		contentTypes: make(map[string]string),
+	}
+}
+
+func (c *fakeClient) HeadObject(ctx context.Context, input *awss3.HeadObjectInput, optFns ...func(*awss3.Options)) (*awss3.HeadObjectOutput, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	value, ok := c.objects[aws.ToString(input.Key)]
+	if !ok {
+		return nil, &types.NotFound{}
+	}
+	return &awss3.HeadObjectOutput{ContentLength: aws.Int64(int64(len(value)))}, nil
+}
+
+func (c *fakeClient) GetObject(ctx context.Context, input *awss3.GetObjectInput, optFns ...func(*awss3.Options)) (*awss3.GetObjectOutput, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	value, ok := c.objects[aws.ToString(input.Key)]
+	if !ok {
+		return nil, &types.NotFound{}
+	}
+	return &awss3.GetObjectOutput{
+		Body:          io.NopCloser(stringsReader(value)),
+		ContentLength: aws.Int64(int64(len(value))),
+	}, nil
+}
+
+func (c *fakeClient) PutObject(ctx context.Context, input *awss3.PutObjectInput, optFns ...func(*awss3.Options)) (*awss3.PutObjectOutput, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	data, err := io.ReadAll(input.Body)
+	if err != nil {
+		return nil, err
+	}
+	key := aws.ToString(input.Key)
+	c.objects[key] = string(data)
+	c.contentTypes[key] = aws.ToString(input.ContentType)
+	c.putKeys = append(c.putKeys, key)
+	return &awss3.PutObjectOutput{}, nil
+}
+
+func (c *fakeClient) ListObjectsV2(ctx context.Context, input *awss3.ListObjectsV2Input, optFns ...func(*awss3.Options)) (*awss3.ListObjectsV2Output, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	c.tokens = append(c.tokens, aws.ToString(input.ContinuationToken))
+	if len(c.listPages) > 0 {
+		index := len(c.tokens) - 1
+		if index >= len(c.listPages) {
+			return &awss3.ListObjectsV2Output{IsTruncated: aws.Bool(false)}, nil
+		}
+		page := c.listPages[index]
+		return &page, nil
+	}
+	return c.dynamicList(input), nil
+}
+
+func (c *fakeClient) DeleteObject(ctx context.Context, input *awss3.DeleteObjectInput, optFns ...func(*awss3.Options)) (*awss3.DeleteObjectOutput, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	key := aws.ToString(input.Key)
+	delete(c.objects, key)
+	c.deleteKeys = append(c.deleteKeys, key)
+	return &awss3.DeleteObjectOutput{}, nil
+}
+
+func (c *fakeClient) dynamicList(input *awss3.ListObjectsV2Input) *awss3.ListObjectsV2Output {
+	prefix := aws.ToString(input.Prefix)
+	delimiter := aws.ToString(input.Delimiter)
+	var contents []types.Object
+	commonPrefixes := make(map[string]struct{})
+	for key, value := range c.objects {
+		if !strings.HasPrefix(key, prefix) {
+			continue
+		}
+		remainder := strings.TrimPrefix(key, prefix)
+		if delimiter != "" {
+			if index := strings.Index(remainder, delimiter); index >= 0 {
+				commonPrefixes[prefix+remainder[:index+1]] = struct{}{}
+				continue
+			}
+		}
+		contents = append(contents, types.Object{Key: aws.String(key), Size: aws.Int64(int64(len(value)))})
+	}
+	sort.Slice(contents, func(i, j int) bool { return aws.ToString(contents[i].Key) < aws.ToString(contents[j].Key) })
+	prefixes := make([]types.CommonPrefix, 0, len(commonPrefixes))
+	for prefix := range commonPrefixes {
+		prefixes = append(prefixes, types.CommonPrefix{Prefix: aws.String(prefix)})
+	}
+	sort.Slice(prefixes, func(i, j int) bool { return aws.ToString(prefixes[i].Prefix) < aws.ToString(prefixes[j].Prefix) })
+	return &awss3.ListObjectsV2Output{
+		Contents:       contents,
+		CommonPrefixes: prefixes,
+		IsTruncated:    aws.Bool(false),
+	}
+}
+
+func stringsReader(value string) io.Reader {
+	return strings.NewReader(value)
+}
+
+func entryPaths(entries []storage.Entry) []string {
+	paths := make([]string, 0, len(entries))
+	for _, entry := range entries {
+		paths = append(paths, entry.Path)
+	}
+	return paths
+}
+
+func sortedStrings(values []string) []string {
+	copied := append([]string(nil), values...)
+	sort.Strings(copied)
+	return copied
+}
+
+func equalStrings(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for index := range a {
+		if a[index] != b[index] {
+			return false
+		}
+	}
+	return true
+}

internal/adapters/s3/integration_test.go

@@ -0,0 +1,39 @@
+package s3
+
+import (
+	"context"
+	"os"
+	"strconv"
+	"testing"
+)
+
+func TestIntegrationS3BackendHasAny(t *testing.T) {
+	endpoint := os.Getenv("DISTRIBUTOR_TEST_S3_ENDPOINT")
+	bucket := os.Getenv("DISTRIBUTOR_TEST_S3_BUCKET")
+	if endpoint == "" || bucket == "" {
+		t.Skip("DISTRIBUTOR_TEST_S3_ENDPOINT and DISTRIBUTOR_TEST_S3_BUCKET are not set")
+	}
+	forcePathStyle := true
+	if raw := os.Getenv("DISTRIBUTOR_TEST_S3_FORCE_PATH_STYLE"); raw != "" {
+		parsed, err := strconv.ParseBool(raw)
+		if err != nil {
+			t.Fatalf("parse DISTRIBUTOR_TEST_S3_FORCE_PATH_STYLE: %v", err)
+		}
+		forcePathStyle = parsed
+	}
+	backend, err := New(context.Background(), Options{
+		Endpoint:        endpoint,
+		Bucket:          bucket,
+		Prefix:          os.Getenv("DISTRIBUTOR_TEST_S3_PREFIX"),
+		Region:          os.Getenv("DISTRIBUTOR_TEST_S3_REGION"),
+		ForcePathStyle:  forcePathStyle,
+		AccessKeyID:     os.Getenv("DISTRIBUTOR_TEST_S3_ACCESS_KEY_ID"),
+		SecretAccessKey: os.Getenv("DISTRIBUTOR_TEST_S3_SECRET_ACCESS_KEY"),
+	})
+	if err != nil {
+		t.Fatalf("New() error = %v", err)
+	}
+	if _, err := backend.HasAny(context.Background(), ""); err != nil {
+		t.Fatalf("HasAny(root) error = %v", err)
+	}
+}

internal/adapters/s3/options.go

@@ -0,0 +1,42 @@
+package s3
+
+import (
+	"fmt"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+const BackendName = "s3"
+
+const DefaultRegion = "us-east-1"
+
+type Options struct {
+	Endpoint        string
+	Bucket          string
+	Prefix          string
+	Region          string
+	ForcePathStyle  bool
+	AccessKeyID     string
+	SecretAccessKey string
+}
+
+func (o Options) normalized() (Options, error) {
+	if o.Endpoint == "" {
+		return Options{}, fmt.Errorf("endpoint is required")
+	}
+	if o.Bucket == "" {
+		return Options{}, fmt.Errorf("bucket is required")
+	}
+	if o.Region == "" {
+		o.Region = DefaultRegion
+	}
+	o.Prefix = strings.Trim(o.Prefix, "/")
+	if err := storage.ValidatePrefix(o.Prefix); err != nil {
+		return Options{}, fmt.Errorf("prefix: %w", err)
+	}
+	if (o.AccessKeyID == "") != (o.SecretAccessKey == "") {
+		return Options{}, fmt.Errorf("access key id and secret access key must be configured together")
+	}
+	return o, nil
+}

internal/adapters/ssh/auth.go

@@ -0,0 +1,61 @@
+package ssh
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"os"
+
+	cryptossh "golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/agent"
+)
+
+type agentDialer func(network, address string) (net.Conn, error)
+
+func authMethods(keyFile string) ([]cryptossh.AuthMethod, func(), error) {
+	return authMethodsWithAgent(os.Getenv("SSH_AUTH_SOCK"), net.Dial, keyFile)
+}
+
+func authMethodsWithAgent(agentSocket string, dial agentDialer, keyFile string) ([]cryptossh.AuthMethod, func(), error) {
+	var methods []cryptossh.AuthMethod
+	var closers []io.Closer
+	if agentSocket != "" {
+		methods = append(methods, cryptossh.PublicKeysCallback(func() ([]cryptossh.Signer, error) {
+			conn, err := dial("unix", agentSocket)
+			if err != nil {
+				return nil, err
+			}
+			closers = append(closers, conn)
+			return agent.NewClient(conn).Signers()
+		}))
+	}
+	if keyFile != "" {
+		signer, err := signerFromKeyFile(keyFile)
+		if err != nil {
+			return nil, nil, err
+		}
+		methods = append(methods, cryptossh.PublicKeys(signer))
+	}
+	if len(methods) == 0 {
+		return nil, nil, fmt.Errorf("no SSH auth methods configured; set SSH_AUTH_SOCK or ssh_key_file")
+	}
+	return methods, func() { closeAll(closers) }, nil
+}
+
+func signerFromKeyFile(path string) (cryptossh.Signer, error) {
+	key, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("read ssh_key_file %q: %w", path, err)
+	}
+	signer, err := cryptossh.ParsePrivateKey(key)
+	if err != nil {
+		return nil, fmt.Errorf("parse ssh_key_file %q: %w", path, err)
+	}
+	return signer, nil
+}
+
+func closeAll(closers []io.Closer) {
+	for _, closer := range closers {
+		_ = closer.Close()
+	}
+}

internal/adapters/ssh/auth_test.go

@@ -0,0 +1,59 @@
+package ssh
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestAuthMethodsPreferAgentBeforeKeyFile(t *testing.T) {
+	keyFile := writePrivateKey(t)
+	methods, cleanup, err := authMethodsWithAgent("/tmp/ssh-agent.sock", nil, keyFile)
+	if err != nil {
+		t.Fatalf("authMethodsWithAgent() error = %v", err)
+	}
+	defer cleanup()
+	if got, want := len(methods), 2; got != want {
+		t.Fatalf("auth method count = %d, want %d", got, want)
+	}
+}
+
+func TestAuthMethodsLoadsKeyFile(t *testing.T) {
+	keyFile := writePrivateKey(t)
+	methods, cleanup, err := authMethodsWithAgent("", nil, keyFile)
+	if err != nil {
+		t.Fatalf("authMethodsWithAgent() error = %v", err)
+	}
+	defer cleanup()
+	if got, want := len(methods), 1; got != want {
+		t.Fatalf("auth method count = %d, want %d", got, want)
+	}
+}
+
+func TestAuthMethodsRejectsMissingAuth(t *testing.T) {
+	_, _, err := authMethodsWithAgent("", nil, "")
+	if err == nil {
+		t.Fatal("authMethodsWithAgent() error = nil, want error")
+	}
+}
+
+func writePrivateKey(t *testing.T) string {
+	t.Helper()
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatalf("generate key: %v", err)
+	}
+	data := pem.EncodeToMemory(&pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
+	})
+	path := filepath.Join(t.TempDir(), "id_rsa")
+	if err := os.WriteFile(path, data, 0o600); err != nil {
+		t.Fatalf("write private key: %v", err)
+	}
+	return path
+}

internal/adapters/ssh/backend.go

@@ -0,0 +1,487 @@
+package ssh
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path"
+	"sort"
+	"strings"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"github.com/pkg/sftp"
+	cryptossh "golang.org/x/crypto/ssh"
+)
+
+type Backend struct {
+	client    *sftp.Client
+	sshClient *cryptossh.Client
+	root      string
+}
+
+func New(ctx context.Context, options Options) (*Backend, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	options, err := options.normalized()
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.Root, storage.ErrInvalidPath, err)
+	}
+	hostKeyCallback, err := hostKeyCallback(options)
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.KnownHosts, storage.ErrInvalidPath, err)
+	}
+	auth, cleanupAuth, err := authMethods(options.KeyFile)
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.KeyFile, storage.ErrPermission, err)
+	}
+	defer cleanupAuth()
+
+	sshClient, err := cryptossh.Dial("tcp", options.address(), &cryptossh.ClientConfig{
+		User:            options.User,
+		Auth:            auth,
+		HostKeyCallback: hostKeyCallback,
+		Timeout:         30 * time.Second,
+	})
+	if err != nil {
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.address(), storage.ErrUnknown, err)
+	}
+	client, err := sftp.NewClient(sshClient)
+	if err != nil {
+		_ = sshClient.Close()
+		return nil, storage.NewError(storage.OpOpenBackend, BackendName, options.address(), storage.ErrUnknown, err)
+	}
+	return &Backend{client: client, sshClient: sshClient, root: options.Root}, nil
+}
+
+func (b *Backend) Close() error {
+	var err error
+	if b.client != nil {
+		err = b.client.Close()
+	}
+	if b.sshClient != nil {
+		if closeErr := b.sshClient.Close(); err == nil {
+			err = closeErr
+		}
+	}
+	return err
+}
+
+func (b *Backend) ReadFile(ctx context.Context, logicalPath string) ([]byte, error) {
+	reader, err := b.OpenReader(ctx, logicalPath)
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, storage.NewError(storage.OpReadFile, BackendName, logicalPath, storage.ErrUnknown, err)
+	}
+	return data, nil
+}
+
+func (b *Backend) OpenReader(ctx context.Context, logicalPath string) (io.ReadCloser, error) {
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	nativePath, err := b.nativePath(logicalPath, false)
+	if err != nil {
+		return nil, err
+	}
+	if err := b.rejectSymlinkAncestors(ctx, logicalPath, true); err != nil {
+		return nil, err
+	}
+	info, err := b.client.Lstat(nativePath)
+	if err != nil {
+		return nil, b.translateError(storage.OpOpenReader, logicalPath, err)
+	}
+	if !info.Mode().IsRegular() {
+		return nil, storage.NewError(storage.OpOpenReader, BackendName, logicalPath, storage.ErrUnsupported, nil)
+	}
+	file, err := b.client.Open(nativePath)
+	if err != nil {
+		return nil, b.translateError(storage.OpOpenReader, logicalPath, err)
+	}
+	return file, nil
+}
+
+func (b *Backend) WriteFile(ctx context.Context, logicalPath string, data []byte, opts storage.WriteOptions) (storage.Entry, error) {
+	opts.Size = int64(len(data))
+	opts.SizeKnown = true
+	return b.WriteFrom(ctx, logicalPath, bytes.NewReader(data), opts)
+}
+
+func (b *Backend) WriteFrom(ctx context.Context, logicalPath string, r io.Reader, opts storage.WriteOptions) (storage.Entry, error) {
+	if err := ctx.Err(); err != nil {
+		return storage.Entry{}, err
+	}
+	nativePath, err := b.nativePath(logicalPath, false)
+	if err != nil {
+		return storage.Entry{}, err
+	}
+	if err := b.rejectSymlinkAncestors(ctx, parentOf(logicalPath), true); err != nil {
+		return storage.Entry{}, err
+	}
+	if info, err := b.client.Lstat(nativePath); err == nil {
+		if !opts.Overwrite {
+			return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrAlreadyExist, nil)
+		}
+		if !info.Mode().IsRegular() {
+			return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrConflict, nil)
+		}
+	} else if !isNotExist(err) {
+		return storage.Entry{}, b.translateError(storage.OpWriteFrom, logicalPath, err)
+	}
+
+	parentNative := path.Dir(nativePath)
+	if err := b.client.MkdirAll(parentNative); err != nil {
+		return storage.Entry{}, b.translateError(storage.OpWriteFrom, logicalPath, err)
+	}
+
+	writePath := nativePath
+	if opts.PreferAtomic {
+		writePath = path.Join(parentNative, fmt.Sprintf(".distributor-write-%d", time.Now().UnixNano()))
+	}
+	file, err := b.client.Create(writePath)
+	if err != nil {
+		return storage.Entry{}, b.translateError(storage.OpWriteFrom, logicalPath, err)
+	}
+	cleanup := opts.PreferAtomic
+	defer func() {
+		if cleanup {
+			_ = b.client.Remove(writePath)
+		}
+	}()
+
+	written, copyErr := io.Copy(file, r)
+	closeErr := file.Close()
+	if copyErr != nil {
+		return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrUnknown, copyErr)
+	}
+	if closeErr != nil {
+		return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrUnknown, closeErr)
+	}
+	if opts.SizeKnown && written != opts.Size {
+		return storage.Entry{}, storage.NewError(storage.OpWriteFrom, BackendName, logicalPath, storage.ErrConflict, fmt.Errorf("stream size %d does not match expected size %d", written, opts.Size))
+	}
+	if opts.PreferAtomic {
+		if err := b.client.Rename(writePath, nativePath); err != nil {
+			return storage.Entry{}, b.translateError(storage.OpWriteFrom, logicalPath, err)
+		}
+		cleanup = false
+	}
+	return b.Stat(ctx, logicalPath)
+}
+
+func (b *Backend) Stat(ctx context.Context, logicalPath string) (storage.Entry, error) {
+	if err := ctx.Err(); err != nil {
+		return storage.Entry{}, err
+	}
+	nativePath, err := b.nativePath(logicalPath, true)
+	if err != nil {
+		return storage.Entry{}, err
+	}
+	info, err := b.client.Lstat(nativePath)
+	if err != nil {
+		return storage.Entry{}, b.translateError(storage.OpStat, logicalPath, err)
+	}
+	return entryFromInfo(logicalPath, info), nil
+}
+
+func (b *Backend) Walk(ctx context.Context, prefix string, opts storage.WalkOptions, fn storage.WalkFunc) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	nativePrefix, err := b.nativePath(prefix, true)
+	if err != nil {
+		return err
+	}
+	info, err := b.client.Lstat(nativePrefix)
+	if err != nil {
+		if isNotExist(err) {
+			return nil
+		}
+		return b.translateError(storage.OpWalk, prefix, err)
+	}
+
+	emitter := storage.NewWalkEmitter(ctx, BackendName, opts, fn)
+
+	if !info.IsDir() {
+		return storage.FinishWalk(emitter.Emit(entryFromInfo(prefix, info)))
+	}
+
+	return storage.FinishWalk(b.walkDirectory(ctx, prefix, nativePrefix, opts, emitter.Emit))
+}
+
+func (b *Backend) HasAny(ctx context.Context, prefix string) (bool, error) {
+	return storage.HasAny(ctx, b, prefix)
+}
+
+func (b *Backend) DeleteManagedBundle(ctx context.Context, bundlePath string, managedOutputPaths []string, opts storage.DeleteOptions) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	targets, err := storage.ManagedBundleTargets(bundlePath, managedOutputPaths)
+	if err != nil {
+		return err
+	}
+	for _, target := range targets {
+		nativePath, err := b.nativePath(target, false)
+		if err != nil {
+			return err
+		}
+		if nativePath == b.root {
+			return storage.NewError(storage.OpDeleteManagedBundle, BackendName, target, storage.ErrInvalidPath, nil)
+		}
+		info, err := b.client.Lstat(nativePath)
+		if err != nil {
+			if opts.IgnoreMissing && isNotExist(err) {
+				continue
+			}
+			return b.translateError(storage.OpDeleteManagedBundle, target, err)
+		}
+		if info.IsDir() {
+			return storage.NewError(storage.OpDeleteManagedBundle, BackendName, target, storage.ErrUnsupported, nil)
+		}
+		if err := b.client.Remove(nativePath); err != nil {
+			return b.translateError(storage.OpDeleteManagedBundle, target, err)
+		}
+		if opts.PruneEmptyDirs {
+			b.pruneEmptyParents(parentOf(target))
+		}
+	}
+	return nil
+}
+
+func (b *Backend) DeletePrefix(ctx context.Context, prefix string, opts storage.DeleteOptions) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	if err := storage.ValidatePrefix(prefix); err != nil {
+		return err
+	}
+	var entries []storage.Entry
+	if prefix != "" {
+		entry, err := b.Stat(ctx, prefix)
+		if err != nil {
+			if opts.IgnoreMissing && storage.IsNotFound(err) {
+				return nil
+			}
+			return err
+		}
+		if entry.Type != storage.EntryTypeDirectory {
+			return b.deleteEntry(ctx, entry, opts)
+		}
+		entries = append(entries, entry)
+	}
+	if err := b.Walk(ctx, prefix, storage.WalkOptions{Recursive: true}, func(entry storage.Entry) error {
+		entries = append(entries, entry)
+		return nil
+	}); err != nil {
+		return err
+	}
+	if prefix != "" && len(entries) == 1 {
+		if err := b.deleteEntry(ctx, entries[0], opts); err != nil {
+			return err
+		}
+		if opts.PruneEmptyDirs {
+			b.pruneEmptyParents(parentOf(prefix))
+		}
+		return nil
+	}
+	sort.Slice(entries, func(i, j int) bool {
+		return strings.Count(entries[i].Path, "/") > strings.Count(entries[j].Path, "/")
+	})
+	for _, entry := range entries {
+		if entry.Path == "" {
+			continue
+		}
+		if err := b.deleteEntry(ctx, entry, storage.DeleteOptions{IgnoreMissing: true}); err != nil {
+			return err
+		}
+	}
+	if opts.PruneEmptyDirs {
+		b.pruneEmptyParents(parentOf(prefix))
+	}
+	return nil
+}
+
+func (b *Backend) deleteEntry(ctx context.Context, entry storage.Entry, opts storage.DeleteOptions) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	nativePath, err := b.nativePath(entry.Path, false)
+	if err != nil {
+		return err
+	}
+	var removeErr error
+	if entry.Type == storage.EntryTypeDirectory {
+		removeErr = b.client.RemoveDirectory(nativePath)
+	} else {
+		removeErr = b.client.Remove(nativePath)
+	}
+	if removeErr != nil {
+		if opts.IgnoreMissing && isNotExist(removeErr) {
+			return nil
+		}
+		return b.translateError(storage.OpDeletePrefix, entry.Path, removeErr)
+	}
+	return nil
+}
+
+func (b *Backend) walkDirectory(ctx context.Context, logicalPrefix, nativePrefix string, opts storage.WalkOptions, emit func(storage.Entry) error) error {
+	entries, err := b.client.ReadDir(nativePrefix)
+	if err != nil {
+		return b.translateError(storage.OpWalk, logicalPrefix, err)
+	}
+	sort.Slice(entries, func(i, j int) bool { return entries[i].Name() < entries[j].Name() })
+	for _, info := range entries {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		logicalPath := info.Name()
+		if logicalPrefix != "" {
+			logicalPath = logicalPrefix + "/" + info.Name()
+		}
+		if err := emit(entryFromInfo(logicalPath, info)); err != nil {
+			return err
+		}
+		if opts.Recursive && info.IsDir() {
+			if err := b.walkDirectory(ctx, logicalPath, path.Join(nativePrefix, info.Name()), opts, emit); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (b *Backend) nativePath(logicalPath string, allowEmpty bool) (string, error) {
+	if logicalPath == "" {
+		if !allowEmpty {
+			return "", storage.NewError(storage.OpValidatePath, BackendName, logicalPath, storage.ErrInvalidPath, nil)
+		}
+		return b.root, nil
+	}
+	if err := storage.ValidatePath(logicalPath); err != nil {
+		return "", err
+	}
+	nativePath := path.Clean(path.Join(b.root, logicalPath))
+	if !withinRoot(b.root, nativePath) {
+		return "", storage.NewError(storage.OpValidatePath, BackendName, logicalPath, storage.ErrInvalidPath, nil)
+	}
+	return nativePath, nil
+}
+
+func (b *Backend) rejectSymlinkAncestors(ctx context.Context, logicalPath string, includeFinal bool) error {
+	if logicalPath == "" {
+		return nil
+	}
+	if err := storage.ValidatePath(logicalPath); err != nil {
+		return err
+	}
+	segments := strings.Split(logicalPath, "/")
+	limit := len(segments)
+	if !includeFinal {
+		limit--
+	}
+	current := ""
+	for index := 0; index < limit; index++ {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		if current == "" {
+			current = segments[index]
+		} else {
+			current += "/" + segments[index]
+		}
+		nativePath, err := b.nativePath(current, false)
+		if err != nil {
+			return err
+		}
+		info, err := b.client.Lstat(nativePath)
+		if err != nil {
+			if isNotExist(err) {
+				return nil
+			}
+			return b.translateError(storage.OpStat, current, err)
+		}
+		if info.Mode()&os.ModeSymlink != 0 {
+			return storage.NewError(storage.OpStat, BackendName, current, storage.ErrUnsupported, nil)
+		}
+	}
+	return nil
+}
+
+func (b *Backend) pruneEmptyParents(logicalPath string) {
+	for logicalPath != "" {
+		nativePath, err := b.nativePath(logicalPath, false)
+		if err != nil || nativePath == b.root {
+			return
+		}
+		if err := b.client.RemoveDirectory(nativePath); err != nil {
+			return
+		}
+		logicalPath = parentOf(logicalPath)
+	}
+}
+
+func withinRoot(root, candidate string) bool {
+	if candidate == root {
+		return true
+	}
+	if root == "/" {
+		return strings.HasPrefix(candidate, "/")
+	}
+	return strings.HasPrefix(candidate, strings.TrimSuffix(root, "/")+"/")
+}
+
+func parentOf(logicalPath string) string {
+	index := strings.LastIndex(logicalPath, "/")
+	if index == -1 {
+		return ""
+	}
+	return logicalPath[:index]
+}
+
+func isNotExist(err error) bool {
+	return errors.Is(err, fs.ErrNotExist) || errors.Is(err, os.ErrNotExist) || errors.Is(err, sftp.ErrSSHFxNoSuchFile)
+}
+
+func (b *Backend) translateError(op, logicalPath string, err error) error {
+	kind := storage.ErrUnknown
+	switch {
+	case isNotExist(err):
+		kind = storage.ErrNotFound
+	case errors.Is(err, fs.ErrExist), errors.Is(err, os.ErrExist):
+		kind = storage.ErrAlreadyExist
+	case errors.Is(err, fs.ErrPermission), errors.Is(err, os.ErrPermission), errors.Is(err, sftp.ErrSSHFxPermissionDenied):
+		kind = storage.ErrPermission
+	case errors.Is(err, sftp.ErrSSHFxOpUnsupported):
+		kind = storage.ErrUnsupported
+	case errors.Is(err, sftp.ErrSSHFxNoConnection), errors.Is(err, sftp.ErrSSHFxConnectionLost):
+		kind = storage.ErrTemporary
+	}
+	return storage.NewError(op, BackendName, logicalPath, kind, err)
+}
+
+func entryFromInfo(logicalPath string, info fs.FileInfo) storage.Entry {
+	entryType := storage.EntryTypeOther
+	switch {
+	case info.Mode()&os.ModeSymlink != 0:
+		entryType = storage.EntryTypeSymlink
+	case info.Mode().IsRegular():
+		entryType = storage.EntryTypeFile
+	case info.IsDir():
+		entryType = storage.EntryTypeDirectory
+	}
+	return storage.Entry{
+		Path: logicalPath,
+		Type: entryType,
+		Size: info.Size(),
+	}
+}

internal/adapters/ssh/hostkeys.go

@@ -0,0 +1,84 @@
+package ssh
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"os"
+
+	cryptossh "golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/knownhosts"
+)
+
+func hostKeyCallback(options Options) (cryptossh.HostKeyCallback, error) {
+	switch options.HostKeyPolicy {
+	case HostKeyPolicyOff:
+		return cryptossh.InsecureIgnoreHostKey(), nil
+	case HostKeyPolicyStrict:
+		if options.KnownHosts == "" {
+			return nil, fmt.Errorf("known_hosts is required for strict host key checking")
+		}
+		callback, err := knownhosts.New(options.KnownHosts)
+		if err != nil {
+			return nil, fmt.Errorf("load known_hosts %q: %w", options.KnownHosts, err)
+		}
+		return callback, nil
+	case HostKeyPolicyAcceptNew:
+		return acceptNewHostKeyCallback(options)
+	default:
+		return nil, fmt.Errorf("host_key_policy must be strict, accept-new, or off")
+	}
+}
+
+func acceptNewHostKeyCallback(options Options) (cryptossh.HostKeyCallback, error) {
+	var checker cryptossh.HostKeyCallback
+	if options.KnownHosts != "" {
+		loaded, err := knownhosts.New(options.KnownHosts)
+		if err == nil {
+			checker = loaded
+		} else if !errors.Is(err, os.ErrNotExist) {
+			return nil, fmt.Errorf("load known_hosts %q: %w", options.KnownHosts, err)
+		}
+	}
+	return func(hostname string, remote net.Addr, key cryptossh.PublicKey) error {
+		if checker != nil {
+			err := checker(hostname, remote, key)
+			if err == nil {
+				return nil
+			}
+			var keyErr *knownhosts.KeyError
+			if !errors.As(err, &keyErr) {
+				return err
+			}
+			if len(keyErr.Want) > 0 {
+				return fmt.Errorf("host key for %s has changed: %w", hostname, err)
+			}
+		}
+		if options.ReadOnlyKnownHosts {
+			return nil
+		}
+		if options.KnownHosts == "" {
+			return fmt.Errorf("host key for %s is unknown and no writable known_hosts path is available", hostname)
+		}
+		if err := appendKnownHost(options.KnownHosts, hostname, key); err != nil {
+			return err
+		}
+		loaded, err := knownhosts.New(options.KnownHosts)
+		if err == nil {
+			checker = loaded
+		}
+		return nil
+	}, nil
+}
+
+func appendKnownHost(path, host string, key cryptossh.PublicKey) error {
+	file, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o600)
+	if err != nil {
+		return fmt.Errorf("persist accepted host key to known_hosts %q: %w", path, err)
+	}
+	defer file.Close()
+	if _, err := fmt.Fprintln(file, knownhosts.Line([]string{knownhosts.Normalize(host)}, key)); err != nil {
+		return fmt.Errorf("persist accepted host key to known_hosts %q: %w", path, err)
+	}
+	return nil
+}

internal/adapters/ssh/hostkeys_test.go

@@ -0,0 +1,138 @@
+package ssh
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"net"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	cryptossh "golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/knownhosts"
+)
+
+func TestAcceptNewHostKeyCallbackPersistsUnknownHost(t *testing.T) {
+	key := testPublicKey(t)
+	knownHosts := filepath.Join(t.TempDir(), "known_hosts")
+	callback, err := acceptNewHostKeyCallback(Options{KnownHosts: knownHosts})
+	if err != nil {
+		t.Fatalf("acceptNewHostKeyCallback() error = %v", err)
+	}
+
+	if err := callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, key); err != nil {
+		t.Fatalf("callback() error = %v", err)
+	}
+	data, err := os.ReadFile(knownHosts)
+	if err != nil {
+		t.Fatalf("read known_hosts: %v", err)
+	}
+	if !strings.Contains(string(data), "example.com") {
+		t.Fatalf("known_hosts = %q, want example.com entry", data)
+	}
+	if err := callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, key); err != nil {
+		t.Fatalf("second callback() error = %v", err)
+	}
+}
+
+func TestAcceptNewHostKeyCallbackReadOnlyDoesNotPersistUnknownHost(t *testing.T) {
+	key := testPublicKey(t)
+	knownHosts := filepath.Join(t.TempDir(), "known_hosts")
+	callback, err := acceptNewHostKeyCallback(Options{
+		KnownHosts:         knownHosts,
+		ReadOnlyKnownHosts: true,
+	})
+	if err != nil {
+		t.Fatalf("acceptNewHostKeyCallback() error = %v", err)
+	}
+
+	if err := callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, key); err != nil {
+		t.Fatalf("callback() error = %v", err)
+	}
+	if _, err := os.Stat(knownHosts); !os.IsNotExist(err) {
+		t.Fatalf("known_hosts stat error = %v, want not exist", err)
+	}
+}
+
+func TestAcceptNewHostKeyCallbackRejectsChangedHostKey(t *testing.T) {
+	first := testPublicKey(t)
+	second := testPublicKey(t)
+	knownHosts := filepath.Join(t.TempDir(), "known_hosts")
+	if err := os.WriteFile(knownHosts, []byte(knownhosts.Line([]string{knownhosts.Normalize("example.com:22")}, first)+"\n"), 0o600); err != nil {
+		t.Fatalf("write known_hosts: %v", err)
+	}
+	callback, err := acceptNewHostKeyCallback(Options{KnownHosts: knownHosts})
+	if err != nil {
+		t.Fatalf("acceptNewHostKeyCallback() error = %v", err)
+	}
+
+	err = callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, second)
+	if err == nil || !strings.Contains(err.Error(), "has changed") {
+		t.Fatalf("callback() error = %v, want changed host key", err)
+	}
+}
+
+func TestAcceptNewHostKeyCallbackReadOnlyRejectsChangedHostKey(t *testing.T) {
+	first := testPublicKey(t)
+	second := testPublicKey(t)
+	knownHosts := filepath.Join(t.TempDir(), "known_hosts")
+	if err := os.WriteFile(knownHosts, []byte(knownhosts.Line([]string{knownhosts.Normalize("example.com:22")}, first)+"\n"), 0o600); err != nil {
+		t.Fatalf("write known_hosts: %v", err)
+	}
+	callback, err := acceptNewHostKeyCallback(Options{
+		KnownHosts:         knownHosts,
+		ReadOnlyKnownHosts: true,
+	})
+	if err != nil {
+		t.Fatalf("acceptNewHostKeyCallback() error = %v", err)
+	}
+
+	err = callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, second)
+	if err == nil || !strings.Contains(err.Error(), "has changed") {
+		t.Fatalf("callback() error = %v, want changed host key", err)
+	}
+}
+
+func TestAcceptNewHostKeyCallbackRequiresWritableKnownHostsForUnknownHost(t *testing.T) {
+	callback, err := acceptNewHostKeyCallback(Options{})
+	if err != nil {
+		t.Fatalf("acceptNewHostKeyCallback() error = %v", err)
+	}
+
+	err = callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, testPublicKey(t))
+	if err == nil || !strings.Contains(err.Error(), "no writable known_hosts path") {
+		t.Fatalf("callback() error = %v, want no writable known_hosts path", err)
+	}
+}
+
+func TestAcceptNewHostKeyCallbackReadOnlyAllowsMissingKnownHosts(t *testing.T) {
+	callback, err := acceptNewHostKeyCallback(Options{ReadOnlyKnownHosts: true})
+	if err != nil {
+		t.Fatalf("acceptNewHostKeyCallback() error = %v", err)
+	}
+
+	if err := callback("example.com:22", &net.TCPAddr{IP: net.ParseIP("192.0.2.10"), Port: 22}, testPublicKey(t)); err != nil {
+		t.Fatalf("callback() error = %v", err)
+	}
+}
+
+func TestStrictHostKeyCallbackRequiresKnownHosts(t *testing.T) {
+	_, err := hostKeyCallback(Options{HostKeyPolicy: HostKeyPolicyStrict})
+	if err == nil || !strings.Contains(err.Error(), "known_hosts is required") {
+		t.Fatalf("hostKeyCallback() error = %v, want known_hosts required", err)
+	}
+}
+
+func testPublicKey(t *testing.T) cryptossh.PublicKey {
+	t.Helper()
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Fatalf("generate key: %v", err)
+	}
+	publicKey, err := cryptossh.NewPublicKey(&privateKey.PublicKey)
+	if err != nil {
+		t.Fatalf("new public key: %v", err)
+	}
+	return publicKey
+}

internal/adapters/ssh/integration_test.go

@@ -0,0 +1,39 @@
+package ssh
+
+import (
+	"context"
+	"os"
+	"strconv"
+	"testing"
+)
+
+func TestIntegrationSSHBackendStatRoot(t *testing.T) {
+	host := os.Getenv("DISTRIBUTOR_TEST_SSH_HOST")
+	if host == "" {
+		t.Skip("DISTRIBUTOR_TEST_SSH_HOST is not set")
+	}
+	port := 22
+	if raw := os.Getenv("DISTRIBUTOR_TEST_SSH_PORT"); raw != "" {
+		parsed, err := strconv.Atoi(raw)
+		if err != nil {
+			t.Fatalf("parse DISTRIBUTOR_TEST_SSH_PORT: %v", err)
+		}
+		port = parsed
+	}
+	backend, err := New(context.Background(), Options{
+		Host:          host,
+		User:          os.Getenv("DISTRIBUTOR_TEST_SSH_USER"),
+		Port:          port,
+		Root:          os.Getenv("DISTRIBUTOR_TEST_SSH_PATH"),
+		KeyFile:       os.Getenv("DISTRIBUTOR_TEST_SSH_KEY_FILE"),
+		KnownHosts:    os.Getenv("DISTRIBUTOR_TEST_SSH_KNOWN_HOSTS"),
+		HostKeyPolicy: HostKeyPolicyStrict,
+	})
+	if err != nil {
+		t.Fatalf("New() error = %v", err)
+	}
+	defer backend.Close()
+	if _, err := backend.Stat(context.Background(), ""); err != nil {
+		t.Fatalf("Stat(root) error = %v", err)
+	}
+}

internal/adapters/ssh/options.go

@@ -0,0 +1,78 @@
+package ssh
+
+import (
+	"fmt"
+	"os"
+	"os/user"
+	"path"
+	"path/filepath"
+	"strconv"
+)
+
+const (
+	BackendName = "ssh"
+
+	HostKeyPolicyStrict    HostKeyPolicy = "strict"
+	HostKeyPolicyAcceptNew HostKeyPolicy = "accept-new"
+	HostKeyPolicyOff       HostKeyPolicy = "off"
+)
+
+type HostKeyPolicy string
+
+type Options struct {
+	Host               string
+	User               string
+	Port               int
+	Root               string
+	KeyFile            string
+	KnownHosts         string
+	HostKeyPolicy      HostKeyPolicy
+	ReadOnlyKnownHosts bool
+}
+
+func (o Options) normalized() (Options, error) {
+	if o.Host == "" {
+		return Options{}, fmt.Errorf("host is required")
+	}
+	if o.User == "" {
+		current, err := user.Current()
+		if err != nil || current.Username == "" {
+			return Options{}, fmt.Errorf("user is required when current OS user cannot be determined")
+		}
+		o.User = current.Username
+	}
+	if o.Port == 0 {
+		o.Port = 22
+	}
+	if o.Port < 1 || o.Port > 65535 {
+		return Options{}, fmt.Errorf("port must be between 1 and 65535")
+	}
+	if o.Root == "" {
+		return Options{}, fmt.Errorf("path is required")
+	}
+	o.Root = path.Clean(o.Root)
+	if o.HostKeyPolicy == "" {
+		o.HostKeyPolicy = HostKeyPolicyAcceptNew
+	}
+	switch o.HostKeyPolicy {
+	case HostKeyPolicyStrict, HostKeyPolicyAcceptNew, HostKeyPolicyOff:
+	default:
+		return Options{}, fmt.Errorf("host_key_policy must be strict, accept-new, or off")
+	}
+	if o.KnownHosts == "" && o.HostKeyPolicy != HostKeyPolicyOff {
+		o.KnownHosts = defaultKnownHostsPath()
+	}
+	return o, nil
+}
+
+func (o Options) address() string {
+	return o.Host + ":" + strconv.Itoa(o.Port)
+}
+
+func defaultKnownHostsPath() string {
+	home, err := os.UserHomeDir()
+	if err != nil || home == "" {
+		return ""
+	}
+	return filepath.Join(home, ".ssh", "known_hosts")
+}

internal/adapters/ssh/options_test.go

@@ -0,0 +1,118 @@
+package ssh
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"github.com/pkg/sftp"
+)
+
+func TestOptionsNormalizeDefaultsUserPortAndHostKeyPolicy(t *testing.T) {
+	options, err := (Options{
+		Host: "example.com",
+		Root: "/reports",
+	}).normalized()
+	if err != nil {
+		t.Fatalf("normalized() error = %v", err)
+	}
+	if options.User == "" {
+		t.Fatal("normalized user is empty")
+	}
+	if options.Port != 22 {
+		t.Fatalf("port = %d, want 22", options.Port)
+	}
+	if options.HostKeyPolicy != HostKeyPolicyAcceptNew {
+		t.Fatalf("host key policy = %q, want accept-new", options.HostKeyPolicy)
+	}
+}
+
+func TestOptionsNormalizeRejectsInvalidFields(t *testing.T) {
+	tests := map[string]Options{
+		"host": {Root: "/reports"},
+		"port": {
+			Host: "example.com",
+			Port: 70000,
+			Root: "/reports",
+		},
+		"path": {
+			Host: "example.com",
+		},
+		"host key policy": {
+			Host:          "example.com",
+			Root:          "/reports",
+			HostKeyPolicy: "prompt",
+		},
+	}
+	for name, options := range tests {
+		t.Run(name, func(t *testing.T) {
+			if _, err := options.normalized(); err == nil {
+				t.Fatal("normalized() error = nil, want error")
+			}
+		})
+	}
+}
+
+func TestNativePathEnforcesLogicalPathRules(t *testing.T) {
+	backend := &Backend{root: "/srv/reports"}
+	tests := map[string]string{
+		"bundle/report.md": "/srv/reports/bundle/report.md",
+		"":                 "/srv/reports",
+	}
+	for logicalPath, want := range tests {
+		t.Run(logicalPath, func(t *testing.T) {
+			got, err := backend.nativePath(logicalPath, true)
+			if err != nil {
+				t.Fatalf("nativePath() error = %v", err)
+			}
+			if got != want {
+				t.Fatalf("nativePath() = %q, want %q", got, want)
+			}
+		})
+	}
+
+	for _, logicalPath := range []string{"/absolute", "../escape", "a/../b", `a\b`} {
+		t.Run("reject "+logicalPath, func(t *testing.T) {
+			_, err := backend.nativePath(logicalPath, true)
+			if err == nil || !storage.IsInvalidPath(err) {
+				t.Fatalf("nativePath() error = %v, want invalid path", err)
+			}
+		})
+	}
+}
+
+func TestNewRejectsMissingAuthBeforeDial(t *testing.T) {
+	t.Setenv("SSH_AUTH_SOCK", "")
+	_, err := New(context.Background(), Options{
+		Host:          "example.com",
+		User:          "reports",
+		Root:          "/reports",
+		HostKeyPolicy: HostKeyPolicyOff,
+	})
+	if err == nil || !strings.Contains(err.Error(), "no SSH auth methods configured") {
+		t.Fatalf("New() error = %v, want missing auth", err)
+	}
+}
+
+func TestTranslateErrorMapsSFTPStatusCodes(t *testing.T) {
+	backend := &Backend{}
+	tests := []struct {
+		name string
+		err  error
+		want storage.ErrorKind
+	}{
+		{name: "not found", err: sftp.ErrSSHFxNoSuchFile, want: storage.ErrNotFound},
+		{name: "permission", err: sftp.ErrSSHFxPermissionDenied, want: storage.ErrPermission},
+		{name: "unsupported", err: sftp.ErrSSHFxOpUnsupported, want: storage.ErrUnsupported},
+		{name: "temporary", err: sftp.ErrSSHFxConnectionLost, want: storage.ErrTemporary},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := backend.translateError(storage.OpStat, "report.md", tt.err)
+			if !storage.IsKind(err, tt.want) {
+				t.Fatalf("translateError() = %v, want kind %s", err, tt.want)
+			}
+		})
+	}
+}

internal/app/backends.go

@@ -3,19 +3,61 @@ package app
 import (
 	"context"
 	"fmt"
+	"strconv"
 
 	"gitea.maximumdirect.net/eric/distributor/internal/adapters/local"
+	s3adapter "gitea.maximumdirect.net/eric/distributor/internal/adapters/s3"
+	sshadapter "gitea.maximumdirect.net/eric/distributor/internal/adapters/ssh"
 	"gitea.maximumdirect.net/eric/distributor/internal/config"
 	"gitea.maximumdirect.net/eric/distributor/internal/storage"
 )
 
 const storagePathKey = "path"
 
+const (
+	sshHostKey          = "host"
+	sshUserKey          = "user"
+	sshPortKey          = "port"
+	sshKeyFileKey       = "ssh_key_file"
+	sshKnownHostsKey    = "known_hosts"
+	sshHostKeyPolicyKey = "host_key_policy"
+	sshReadOnlyHostsKey = "read_only_known_hosts"
+	s3EndpointKey       = "endpoint"
+	s3BucketKey         = "bucket"
+	s3PrefixKey         = "prefix"
+	s3RegionKey         = "region"
+	s3ForcePathStyleKey = "force_path_style"
+	s3AccessKeyIDKey    = "access_key_id"
+	s3SecretAccessKey   = "secret_access_key"
+)
+
 type backendFactory struct {
-	registry *storage.Registry
+	registry           *storage.Registry
+	environment        config.Environment
+	readOnlyKnownHosts bool
+}
+
+type backendOpenSpec struct {
+	role        string
+	backend     string
+	path        string
+	host        string
+	user        string
+	port        int
+	ssh         config.SSH
+	endpoint    string
+	bucket      string
+	prefix      string
+	region      string
+	forcePath   *bool
+	credentials config.Credentials
 }
 
 func newBackendFactory() *backendFactory {
+	return newBackendFactoryWithEnvironment(config.ProcessEnvironment())
+}
+
+func newBackendFactoryWithEnvironment(environment config.Environment) *backendFactory {
 	registry := storage.NewRegistry()
 	_ = registry.Register(config.BackendLocal, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
 		if err := ctx.Err(); err != nil {
@@ -23,23 +65,149 @@ func newBackendFactory() *backendFactory {
 		}
 		return local.New(cfg[storagePathKey])
 	})
-	return &backendFactory{registry: registry}
+	_ = registry.Register(config.BackendSSH, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		port, err := strconv.Atoi(cfg[sshPortKey])
+		if err != nil {
+			return nil, fmt.Errorf("ssh port: %w", err)
+		}
+		readOnlyKnownHosts := false
+		if raw := cfg[sshReadOnlyHostsKey]; raw != "" {
+			readOnlyKnownHosts, err = strconv.ParseBool(raw)
+			if err != nil {
+				return nil, fmt.Errorf("ssh read_only_known_hosts: %w", err)
+			}
+		}
+		return sshadapter.New(ctx, sshadapter.Options{
+			Host:               cfg[sshHostKey],
+			User:               cfg[sshUserKey],
+			Port:               port,
+			Root:               cfg[storagePathKey],
+			KeyFile:            cfg[sshKeyFileKey],
+			KnownHosts:         cfg[sshKnownHostsKey],
+			HostKeyPolicy:      sshadapter.HostKeyPolicy(cfg[sshHostKeyPolicyKey]),
+			ReadOnlyKnownHosts: readOnlyKnownHosts,
+		})
+	})
+	_ = registry.Register(config.BackendS3, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		forcePathStyle, err := strconv.ParseBool(cfg[s3ForcePathStyleKey])
+		if err != nil {
+			return nil, fmt.Errorf("s3 force_path_style: %w", err)
+		}
+		return s3adapter.New(ctx, s3adapter.Options{
+			Endpoint:        cfg[s3EndpointKey],
+			Bucket:          cfg[s3BucketKey],
+			Prefix:          cfg[s3PrefixKey],
+			Region:          cfg[s3RegionKey],
+			ForcePathStyle:  forcePathStyle,
+			AccessKeyID:     cfg[s3AccessKeyIDKey],
+			SecretAccessKey: cfg[s3SecretAccessKey],
+		})
+	})
+	return &backendFactory{registry: registry, environment: environment}
 }
 
 func (f *backendFactory) openSource(ctx context.Context, source config.Backend) (storage.Backend, error) {
-	if source.Backend != config.BackendLocal {
-		return nil, fmt.Errorf("source backend %s is not implemented for execution", source.Backend)
-	}
-	return f.registry.Open(ctx, source.Backend, storage.OpenConfig{storagePathKey: source.Path})
+	return f.openBackend(ctx, backendOpenSpecFromSource(source))
 }
 
 func (f *backendFactory) openDestination(ctx context.Context, destination config.Destination) (storage.Backend, error) {
-	if destination.Backend != config.BackendLocal {
-		return nil, fmt.Errorf("backend %s is not implemented for execution", destination.Backend)
-	}
-	return f.registry.Open(ctx, destination.Backend, storage.OpenConfig{storagePathKey: destination.Path})
+	return f.openBackend(ctx, backendOpenSpecFromDestination(destination))
 }
 
 func (f *backendFactory) openLocalPath(ctx context.Context, path string) (storage.Backend, error) {
 	return f.registry.Open(ctx, config.BackendLocal, storage.OpenConfig{storagePathKey: path})
 }
+
+func (f *backendFactory) resolveCredentials(creds config.Credentials) (config.ResolvedCredentials, error) {
+	return f.environment.ResolveCredentials(creds)
+}
+
+func (f *backendFactory) openBackend(ctx context.Context, spec backendOpenSpec) (storage.Backend, error) {
+	if !backendExecutable(spec.backend) {
+		if spec.role == "source" {
+			return nil, fmt.Errorf("source backend %s is not implemented for execution", spec.backend)
+		}
+		return nil, fmt.Errorf("backend %s is not implemented for execution", spec.backend)
+	}
+	openConfig, err := f.openConfig(spec)
+	if err != nil {
+		return nil, err
+	}
+	return f.registry.Open(ctx, spec.backend, openConfig)
+}
+
+func backendExecutable(name string) bool {
+	return name == config.BackendLocal || name == config.BackendSSH || name == config.BackendS3
+}
+
+func (f *backendFactory) openConfig(spec backendOpenSpec) (storage.OpenConfig, error) {
+	cfg := storage.OpenConfig{storagePathKey: spec.path}
+	switch spec.backend {
+	case config.BackendSSH:
+		cfg[sshHostKey] = spec.host
+		cfg[sshUserKey] = spec.user
+		cfg[sshPortKey] = strconv.Itoa(spec.port)
+		cfg[sshKeyFileKey] = spec.ssh.KeyFile
+		cfg[sshKnownHostsKey] = spec.ssh.KnownHosts
+		cfg[sshHostKeyPolicyKey] = string(spec.ssh.HostKeyPolicy)
+		cfg[sshReadOnlyHostsKey] = strconv.FormatBool(f.readOnlyKnownHosts)
+	case config.BackendS3:
+		if err := f.addS3Config(cfg, spec); err != nil {
+			return nil, err
+		}
+	}
+	return cfg, nil
+}
+
+func (f *backendFactory) addS3Config(cfg storage.OpenConfig, spec backendOpenSpec) error {
+	cfg[s3EndpointKey] = spec.endpoint
+	cfg[s3BucketKey] = spec.bucket
+	cfg[s3PrefixKey] = spec.prefix
+	cfg[s3RegionKey] = spec.region
+	cfg[s3ForcePathStyleKey] = strconv.FormatBool(config.ForcePathStyle(spec.forcePath))
+	if spec.credentials.AccessKeyIDEnv != "" || spec.credentials.SecretAccessKeyEnv != "" {
+		resolved, err := f.resolveCredentials(spec.credentials)
+		if err != nil {
+			return err
+		}
+		cfg[s3AccessKeyIDKey] = resolved.AccessKeyID
+		cfg[s3SecretAccessKey] = resolved.SecretAccessKey
+	}
+	return nil
+}
+
+func backendOpenSpecFromSource(source config.Backend) backendOpenSpec {
+	return backendOpenSpec{
+		role:        "source",
+		backend:     source.Backend,
+		path:        source.Path,
+		host:        source.Host,
+		user:        source.User,
+		port:        source.Port,
+		ssh:         source.SSH,
+		endpoint:    source.Endpoint,
+		bucket:      source.Bucket,
+		prefix:      source.Prefix,
+		region:      source.Region,
+		forcePath:   source.ForcePath,
+		credentials: source.Creds,
+	}
+}
+
+func backendOpenSpecFromDestination(destination config.Destination) backendOpenSpec {
+	return backendOpenSpec{
+		role:        "destination",
+		backend:     destination.Backend,
+		path:        destination.Path,
+		host:        destination.Host,
+		user:        destination.User,
+		port:        destination.Port,
+		ssh:         destination.SSH,
+		endpoint:    destination.Endpoint,
+		bucket:      destination.Bucket,
+		prefix:      destination.Prefix,
+		region:      destination.Region,
+		forcePath:   destination.ForcePath,
+		credentials: destination.Creds,
+	}
+}

internal/app/backends_test.go

@@ -1,11 +1,16 @@
 package app
 
 import (
+	"bytes"
 	"context"
+	"fmt"
 	"strings"
 	"testing"
 
 	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage/fake"
+	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
 )
 
 func TestBackendFactoryOpensLocalSource(t *testing.T) {
@@ -47,14 +52,125 @@ func TestBackendFactoryOpensDirectLocalPath(t *testing.T) {
 	}
 }
 
+func TestBackendFactoryOpensSSHSourceWithRegisteredOpener(t *testing.T) {
+	factory := &backendFactory{registry: storage.NewRegistry()}
+	var got storage.OpenConfig
+	if err := factory.registry.Register(config.BackendSSH, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		got = cfg
+		return fake.New(), nil
+	}); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+
+	backend, err := factory.openSource(context.Background(), config.Backend{
+		Backend: config.BackendSSH,
+		Host:    "source.example.com",
+		User:    "reports",
+		Port:    22,
+		Path:    "/reports",
+		SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyAcceptNew},
+	})
+	if err != nil {
+		t.Fatalf("openSource() error = %v", err)
+	}
+	if backend == nil {
+		t.Fatal("openSource() backend = nil")
+	}
+	if got[sshHostKey] != "source.example.com" || got[storagePathKey] != "/reports" {
+		t.Fatalf("open config = %#v, want SSH source fields", got)
+	}
+}
+
+func TestBackendFactoryOpensSSHDestinationWithRegisteredOpener(t *testing.T) {
+	factory := &backendFactory{registry: storage.NewRegistry()}
+	var got storage.OpenConfig
+	if err := factory.registry.Register(config.BackendSSH, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		got = cfg
+		return fake.New(), nil
+	}); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+
+	backend, err := factory.openDestination(context.Background(), config.Destination{
+		Backend: config.BackendSSH,
+		Host:    "destination.example.com",
+		User:    "deploy",
+		Port:    2222,
+		Path:    "/archive",
+		SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyStrict},
+	})
+	if err != nil {
+		t.Fatalf("openDestination() error = %v", err)
+	}
+	if backend == nil {
+		t.Fatal("openDestination() backend = nil")
+	}
+	if got[sshHostKey] != "destination.example.com" || got[sshPortKey] != "2222" || got[sshHostKeyPolicyKey] != "strict" {
+		t.Fatalf("open config = %#v, want SSH destination fields", got)
+	}
+}
+
+func TestBackendFactorySetsReadOnlyKnownHostsForDryRunSSH(t *testing.T) {
+	factory := &backendFactory{
+		registry:           storage.NewRegistry(),
+		readOnlyKnownHosts: true,
+	}
+	var got storage.OpenConfig
+	if err := factory.registry.Register(config.BackendSSH, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		got = cfg
+		return fake.New(), nil
+	}); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+
+	_, err := factory.openDestination(context.Background(), config.Destination{
+		Backend: config.BackendSSH,
+		Host:    "destination.example.com",
+		User:    "deploy",
+		Port:    22,
+		Path:    "/archive",
+		SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyAcceptNew},
+	})
+	if err != nil {
+		t.Fatalf("openDestination() error = %v", err)
+	}
+	if got[sshReadOnlyHostsKey] != "true" {
+		t.Fatalf("open config %s = %q, want true", sshReadOnlyHostsKey, got[sshReadOnlyHostsKey])
+	}
+}
+
+func TestBackendFactoryUsesPersistentKnownHostsByDefault(t *testing.T) {
+	factory := &backendFactory{registry: storage.NewRegistry()}
+	var got storage.OpenConfig
+	if err := factory.registry.Register(config.BackendSSH, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		got = cfg
+		return fake.New(), nil
+	}); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+
+	_, err := factory.openDestination(context.Background(), config.Destination{
+		Backend: config.BackendSSH,
+		Host:    "destination.example.com",
+		User:    "deploy",
+		Port:    22,
+		Path:    "/archive",
+		SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyAcceptNew},
+	})
+	if err != nil {
+		t.Fatalf("openDestination() error = %v", err)
+	}
+	if got[sshReadOnlyHostsKey] != "false" {
+		t.Fatalf("open config %s = %q, want false", sshReadOnlyHostsKey, got[sshReadOnlyHostsKey])
+	}
+}
+
 func TestBackendFactoryRejectsUnsupportedSource(t *testing.T) {
 	factory := newBackendFactory()
 	_, err := factory.openSource(context.Background(), config.Backend{
-		Backend: config.BackendSSH,
-		URI:     "ssh://reports@example.com:22",
-		Path:    "/reports",
+		Backend: "ftp",
 	})
-	if err == nil || !strings.Contains(err.Error(), "source backend ssh is not implemented for execution") {
+	if err == nil || !strings.Contains(err.Error(), "source backend ftp is not implemented for execution") {
 		t.Fatalf("openSource() error = %v, want not implemented", err)
 	}
 }
@@ -62,11 +178,461 @@ func TestBackendFactoryRejectsUnsupportedSource(t *testing.T) {
 func TestBackendFactoryRejectsUnsupportedDestination(t *testing.T) {
 	factory := newBackendFactory()
 	_, err := factory.openDestination(context.Background(), config.Destination{
-		Backend:  config.BackendS3,
-		Endpoint: "https://s3.example.com",
-		Bucket:   "reports",
+		Backend: "ftp",
 	})
-	if err == nil || !strings.Contains(err.Error(), "backend s3 is not implemented for execution") {
+	if err == nil || !strings.Contains(err.Error(), "backend ftp is not implemented for execution") {
 		t.Fatalf("openDestination() error = %v, want not implemented", err)
 	}
 }
+
+func TestBackendFactoryOpensS3DestinationWithRegisteredOpener(t *testing.T) {
+	factory := &backendFactory{
+		registry:    storage.NewRegistry(),
+		environment: config.NewEnvironment(nil, func(string) (string, bool) { return "", false }),
+	}
+	var got storage.OpenConfig
+	if err := factory.registry.Register(config.BackendS3, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		got = cfg
+		return fake.New(), nil
+	}); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+	forcePathStyle := false
+	backend, err := factory.openDestination(context.Background(), config.Destination{
+		Backend:   config.BackendS3,
+		Endpoint:  "https://s3.example.com",
+		Bucket:    "reports",
+		Prefix:    "archive",
+		Region:    config.DefaultS3Region,
+		ForcePath: &forcePathStyle,
+	})
+	if err != nil {
+		t.Fatalf("openDestination() error = %v", err)
+	}
+	if backend == nil {
+		t.Fatal("openDestination() backend = nil")
+	}
+	assertOpenConfig(t, got, map[string]string{
+		s3EndpointKey:       "https://s3.example.com",
+		s3BucketKey:         "reports",
+		s3PrefixKey:         "archive",
+		s3RegionKey:         config.DefaultS3Region,
+		s3ForcePathStyleKey: "false",
+	})
+}
+
+func TestBackendFactoryResolvesS3CredentialsThroughSecretsAwareEnvironment(t *testing.T) {
+	factory := &backendFactory{
+		registry: storage.NewRegistry(),
+		environment: config.NewEnvironment(map[string]string{
+			"ACCESS_KEY_ID":     "secret-access",
+			"SECRET_ACCESS_KEY": "secret-secret",
+		}, func(string) (string, bool) { return "", false }),
+	}
+	var got storage.OpenConfig
+	if err := factory.registry.Register(config.BackendS3, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+		got = cfg
+		return fake.New(), nil
+	}); err != nil {
+		t.Fatalf("Register() error = %v", err)
+	}
+	forcePathStyle := true
+	_, err := factory.openSource(context.Background(), config.Backend{
+		Backend:   config.BackendS3,
+		Endpoint:  "https://s3.example.com",
+		Bucket:    "reports",
+		Region:    config.DefaultS3Region,
+		ForcePath: &forcePathStyle,
+		Creds: config.Credentials{
+			AccessKeyIDEnv:     "ACCESS_KEY_ID",
+			SecretAccessKeyEnv: "SECRET_ACCESS_KEY",
+		},
+	})
+	if err != nil {
+		t.Fatalf("openSource() error = %v", err)
+	}
+	assertOpenConfig(t, got, map[string]string{
+		s3AccessKeyIDKey:  "secret-access",
+		s3SecretAccessKey: "secret-secret",
+	})
+}
+
+func TestBackendFactoryResolvesCredentialsThroughEnvironment(t *testing.T) {
+	factory := newBackendFactoryWithEnvironment(config.NewEnvironment(map[string]string{
+		"ACCESS_KEY_ID":     "secret-access",
+		"SECRET_ACCESS_KEY": "secret-secret",
+	}, func(string) (string, bool) {
+		return "", false
+	}))
+
+	creds, err := factory.resolveCredentials(config.Credentials{
+		AccessKeyIDEnv:     "ACCESS_KEY_ID",
+		SecretAccessKeyEnv: "SECRET_ACCESS_KEY",
+	})
+	if err != nil {
+		t.Fatalf("resolveCredentials() error = %v", err)
+	}
+	if creds.AccessKeyID != "secret-access" || creds.SecretAccessKey != "secret-secret" {
+		t.Fatalf("resolved credentials = %#v", creds)
+	}
+}
+
+func TestBackendFactoryBuildsSSHSourceOpenConfig(t *testing.T) {
+	factory := &backendFactory{environment: config.NewEnvironment(nil, nil)}
+	cfg, err := factory.openConfig(backendOpenSpecFromSource(config.Backend{
+		Backend: config.BackendSSH,
+		Host:    "source.example.com",
+		User:    "reports",
+		Port:    2222,
+		Path:    "/reports",
+		SSH: config.SSH{
+			KeyFile:       "/home/reports/.ssh/id_ed25519",
+			KnownHosts:    "/home/reports/.ssh/known_hosts",
+			HostKeyPolicy: config.HostKeyPolicyStrict,
+		},
+	}))
+	if err != nil {
+		t.Fatalf("openConfig() error = %v", err)
+	}
+
+	assertOpenConfig(t, cfg, map[string]string{
+		storagePathKey:      "/reports",
+		sshHostKey:          "source.example.com",
+		sshUserKey:          "reports",
+		sshPortKey:          "2222",
+		sshKeyFileKey:       "/home/reports/.ssh/id_ed25519",
+		sshKnownHostsKey:    "/home/reports/.ssh/known_hosts",
+		sshHostKeyPolicyKey: "strict",
+	})
+}
+
+func TestBackendFactoryBuildsSSHDestinationOpenConfig(t *testing.T) {
+	factory := &backendFactory{environment: config.NewEnvironment(nil, nil)}
+	cfg, err := factory.openConfig(backendOpenSpecFromDestination(config.Destination{
+		Backend: config.BackendSSH,
+		Host:    "destination.example.com",
+		User:    "deploy",
+		Port:    22,
+		Path:    "/srv/archive",
+		SSH: config.SSH{
+			HostKeyPolicy: config.HostKeyPolicyAcceptNew,
+		},
+	}))
+	if err != nil {
+		t.Fatalf("openConfig() error = %v", err)
+	}
+
+	assertOpenConfig(t, cfg, map[string]string{
+		storagePathKey:      "/srv/archive",
+		sshHostKey:          "destination.example.com",
+		sshUserKey:          "deploy",
+		sshPortKey:          "22",
+		sshHostKeyPolicyKey: "accept-new",
+	})
+}
+
+func TestBackendFactoryBuildsEquivalentSourceAndDestinationOpenConfig(t *testing.T) {
+	forcePathStyle := false
+	tests := []struct {
+		name        string
+		source      config.Backend
+		destination config.Destination
+	}{
+		{
+			name:        "local",
+			source:      config.Backend{Backend: config.BackendLocal, Path: "/reports"},
+			destination: config.Destination{Backend: config.BackendLocal, Path: "/reports"},
+		},
+		{
+			name: "ssh",
+			source: config.Backend{
+				Backend: config.BackendSSH,
+				Host:    "reports.example.com",
+				User:    "reports",
+				Port:    2222,
+				Path:    "/reports",
+				SSH: config.SSH{
+					KeyFile:       "/home/reports/.ssh/id_ed25519",
+					KnownHosts:    "/home/reports/.ssh/known_hosts",
+					HostKeyPolicy: config.HostKeyPolicyStrict,
+				},
+			},
+			destination: config.Destination{
+				Backend: config.BackendSSH,
+				Host:    "reports.example.com",
+				User:    "reports",
+				Port:    2222,
+				Path:    "/reports",
+				SSH: config.SSH{
+					KeyFile:       "/home/reports/.ssh/id_ed25519",
+					KnownHosts:    "/home/reports/.ssh/known_hosts",
+					HostKeyPolicy: config.HostKeyPolicyStrict,
+				},
+			},
+		},
+		{
+			name: "s3",
+			source: config.Backend{
+				Backend:   config.BackendS3,
+				Endpoint:  "https://s3.example.com",
+				Bucket:    "reports",
+				Prefix:    "archive",
+				Region:    "us-west-2",
+				ForcePath: &forcePathStyle,
+			},
+			destination: config.Destination{
+				Backend:   config.BackendS3,
+				Endpoint:  "https://s3.example.com",
+				Bucket:    "reports",
+				Prefix:    "archive",
+				Region:    "us-west-2",
+				ForcePath: &forcePathStyle,
+			},
+		},
+		{
+			name: "s3 explicit credentials",
+			source: config.Backend{
+				Backend:  config.BackendS3,
+				Endpoint: "https://s3.example.com",
+				Bucket:   "reports",
+				Region:   config.DefaultS3Region,
+				Creds: config.Credentials{
+					AccessKeyIDEnv:     "ACCESS_KEY_ID",
+					SecretAccessKeyEnv: "SECRET_ACCESS_KEY",
+				},
+			},
+			destination: config.Destination{
+				Backend:  config.BackendS3,
+				Endpoint: "https://s3.example.com",
+				Bucket:   "reports",
+				Region:   config.DefaultS3Region,
+				Creds: config.Credentials{
+					AccessKeyIDEnv:     "ACCESS_KEY_ID",
+					SecretAccessKeyEnv: "SECRET_ACCESS_KEY",
+				},
+			},
+		},
+	}
+
+	factory := &backendFactory{
+		environment: config.NewEnvironment(map[string]string{
+			"ACCESS_KEY_ID":     "secret-access",
+			"SECRET_ACCESS_KEY": "secret-secret",
+		}, func(string) (string, bool) { return "", false }),
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sourceConfig, err := factory.openConfig(backendOpenSpecFromSource(tt.source))
+			if err != nil {
+				t.Fatalf("source openConfig() error = %v", err)
+			}
+			destinationConfig, err := factory.openConfig(backendOpenSpecFromDestination(tt.destination))
+			if err != nil {
+				t.Fatalf("destination openConfig() error = %v", err)
+			}
+			if !openConfigEqual(sourceConfig, destinationConfig) {
+				t.Fatalf("source open config = %#v, destination open config = %#v, want equivalent", sourceConfig, destinationConfig)
+			}
+		})
+	}
+}
+
+func TestBackendFactoryBuildsEquivalentDryRunSSHOpenConfig(t *testing.T) {
+	factory := &backendFactory{readOnlyKnownHosts: true}
+	sourceConfig, err := factory.openConfig(backendOpenSpecFromSource(config.Backend{
+		Backend: config.BackendSSH,
+		Host:    "reports.example.com",
+		Port:    22,
+		Path:    "/reports",
+		SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyAcceptNew},
+	}))
+	if err != nil {
+		t.Fatalf("source openConfig() error = %v", err)
+	}
+	destinationConfig, err := factory.openConfig(backendOpenSpecFromDestination(config.Destination{
+		Backend: config.BackendSSH,
+		Host:    "reports.example.com",
+		Port:    22,
+		Path:    "/reports",
+		SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyAcceptNew},
+	}))
+	if err != nil {
+		t.Fatalf("destination openConfig() error = %v", err)
+	}
+	if !openConfigEqual(sourceConfig, destinationConfig) {
+		t.Fatalf("source open config = %#v, destination open config = %#v, want equivalent", sourceConfig, destinationConfig)
+	}
+	if sourceConfig[sshReadOnlyHostsKey] != "true" {
+		t.Fatalf("open config %s = %q, want true", sshReadOnlyHostsKey, sourceConfig[sshReadOnlyHostsKey])
+	}
+}
+
+func TestConfiguredSourceValidationAndRunUseEquivalentSourceOpenConfig(t *testing.T) {
+	tests := []struct {
+		name       string
+		source     config.Backend
+		sourceKey  string
+		dest       config.Destination
+		destKey    string
+		wantFields map[string]string
+	}{
+		{
+			name: "s3",
+			source: config.Backend{
+				Backend:  config.BackendS3,
+				Endpoint: "https://s3.example.com",
+				Bucket:   "source-bucket",
+				Prefix:   "source-prefix",
+				Region:   config.DefaultS3Region,
+			},
+			sourceKey: "s3:source-bucket",
+			dest: config.Destination{
+				ID:       "archive",
+				Backend:  config.BackendS3,
+				Endpoint: "https://s3.example.com",
+				Bucket:   "destination-bucket",
+				Region:   config.DefaultS3Region,
+			},
+			destKey: "s3:destination-bucket",
+			wantFields: map[string]string{
+				s3EndpointKey:       "https://s3.example.com",
+				s3BucketKey:         "source-bucket",
+				s3PrefixKey:         "source-prefix",
+				s3RegionKey:         config.DefaultS3Region,
+				s3ForcePathStyleKey: "true",
+			},
+		},
+		{
+			name: "ssh",
+			source: config.Backend{
+				Backend: config.BackendSSH,
+				Host:    "ssh.example.com",
+				User:    "reports",
+				Port:    2222,
+				Path:    "/source",
+				SSH: config.SSH{
+					KeyFile:       "/home/reports/.ssh/id_ed25519",
+					KnownHosts:    "/home/reports/.ssh/known_hosts",
+					HostKeyPolicy: config.HostKeyPolicyStrict,
+				},
+			},
+			sourceKey: "ssh:/source",
+			dest: config.Destination{
+				ID:      "archive",
+				Backend: config.BackendSSH,
+				Host:    "ssh.example.com",
+				Port:    2222,
+				Path:    "/destination",
+				SSH:     config.SSH{HostKeyPolicy: config.HostKeyPolicyStrict},
+			},
+			destKey: "ssh:/destination",
+			wantFields: map[string]string{
+				storagePathKey:      "/source",
+				sshHostKey:          "ssh.example.com",
+				sshUserKey:          "reports",
+				sshPortKey:          "2222",
+				sshKeyFileKey:       "/home/reports/.ssh/id_ed25519",
+				sshKnownHostsKey:    "/home/reports/.ssh/known_hosts",
+				sshHostKeyPolicyKey: "strict",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sourceBackend := fake.New()
+			testutil.WriteFakeSourceBundle(t, sourceBackend, "", testutil.BundleOptions{ID: "reports.source"})
+			destinationBackend := fake.New()
+			var validateSourceConfig storage.OpenConfig
+			var runSourceConfig storage.OpenConfig
+			validateProvider := recordingBackendFactoryProvider(t, map[string]storage.Backend{
+				tt.sourceKey: sourceBackend,
+				tt.destKey:   destinationBackend,
+			}, func(cfg storage.OpenConfig) {
+				validateSourceConfig = cfg
+			})
+			runProvider := recordingBackendFactoryProvider(t, map[string]storage.Backend{
+				tt.sourceKey: sourceBackend,
+				tt.destKey:   destinationBackend,
+			}, func(cfg storage.OpenConfig) {
+				runSourceConfig = cfg
+			})
+			cfg := config.Config{Pipelines: []config.Pipeline{{
+				ID:           "reports",
+				Source:       tt.source,
+				Destinations: []config.Destination{tt.dest},
+			}}}
+			config.ApplyDefaults(&cfg)
+
+			var validateOutput bytes.Buffer
+			if err := validateConfigWithBackendFactory(context.Background(), cfg, ValidateOptions{
+				PipelineID: "reports",
+				Stdout:     &validateOutput,
+			}, validateProvider); err != nil {
+				t.Fatalf("validateConfigWithBackendFactory() error = %v", err)
+			}
+			if err := runConfigWithBackendFactory(context.Background(), cfg, RunOptions{}, runProvider); err != nil {
+				t.Fatalf("runConfigWithBackendFactory() error = %v", err)
+			}
+			if !openConfigEqual(validateSourceConfig, runSourceConfig) {
+				t.Fatalf("validate source config = %#v, run source config = %#v, want equivalent", validateSourceConfig, runSourceConfig)
+			}
+			assertOpenConfig(t, runSourceConfig, tt.wantFields)
+		})
+	}
+}
+
+func assertOpenConfig(t *testing.T, got map[string]string, want map[string]string) {
+	t.Helper()
+	for key, wantValue := range want {
+		if gotValue := got[key]; gotValue != wantValue {
+			t.Fatalf("open config %s = %q, want %q", key, gotValue, wantValue)
+		}
+	}
+}
+
+func openConfigEqual(left, right storage.OpenConfig) bool {
+	if len(left) != len(right) {
+		return false
+	}
+	for key, leftValue := range left {
+		if right[key] != leftValue {
+			return false
+		}
+	}
+	return true
+}
+
+func recordingBackendFactoryProvider(t *testing.T, remoteBackends map[string]storage.Backend, recordSource func(storage.OpenConfig)) backendFactoryProvider {
+	t.Helper()
+	return func(environment config.Environment) *backendFactory {
+		registry := storage.NewRegistry()
+		if err := registry.Register(config.BackendS3, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+			if cfg[s3BucketKey] == "source-bucket" {
+				recordSource(cfg)
+			}
+			key := "s3:" + cfg[s3BucketKey]
+			backend := remoteBackends[key]
+			if backend == nil {
+				return nil, fmt.Errorf("missing fake backend for %s", key)
+			}
+			return backend, nil
+		}); err != nil {
+			t.Fatalf("register s3 backend: %v", err)
+		}
+		if err := registry.Register(config.BackendSSH, func(ctx context.Context, cfg storage.OpenConfig) (storage.Backend, error) {
+			if cfg[storagePathKey] == "/source" {
+				recordSource(cfg)
+			}
+			key := "ssh:" + cfg[storagePathKey]
+			backend := remoteBackends[key]
+			if backend == nil {
+				return nil, fmt.Errorf("missing fake backend for %s", key)
+			}
+			return backend, nil
+		}); err != nil {
+			t.Fatalf("register ssh backend: %v", err)
+		}
+		return &backendFactory{registry: registry, environment: environment}
+	}
+}

internal/app/inspect.go

@@ -5,44 +5,100 @@ import (
 	"fmt"
 	"io"
 
-	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
 	"gitea.maximumdirect.net/eric/distributor/internal/storage"
 )
 
 type InspectOptions struct {
-	Path   string
-	Stdout io.Writer
+	Path         string
+	ConfigPath   string
+	PipelineID   string
+	BundlePath   string
+	Stdout       io.Writer
+	OutputFormat OutputFormat
 }
 
 func Inspect(ctx context.Context, options InspectOptions) error {
-	if options.Path == "" {
-		return fmt.Errorf("inspect command requires a path")
-	}
-	backend, err := newBackendFactory().openLocalPath(ctx, options.Path)
-	if err != nil {
-		return err
-	}
-	bundles, err := bundle.Discover(ctx, backend, "")
-	if err != nil {
-		return err
-	}
-	return writeInspection(options.Stdout, bundles)
+	return inspectWithBackendFactory(ctx, options, newBackendFactoryWithEnvironment)
 }
 
-func writeInspection(w io.Writer, bundles []bundle.Bundle) error {
+func inspectWithBackendFactory(ctx context.Context, options InspectOptions, provider backendFactoryProvider) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
+	}
+	selection, err := selectSourceBundles(ctx, sourceCommandOptions{
+		CommandName: "inspect",
+		Path:        options.Path,
+		ConfigPath:  options.ConfigPath,
+		PipelineID:  options.PipelineID,
+		BundlePath:  options.BundlePath,
+	}, provider)
+	if err != nil {
+		return err
+	}
+	return writeInspectResult(options, selection)
+}
+
+func inspectConfigWithBackendFactory(ctx context.Context, cfg config.Config, options InspectOptions, provider backendFactoryProvider) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
+	}
+	selection, err := selectSourceBundlesFromConfig(ctx, cfg, sourceCommandOptions{
+		CommandName: "inspect",
+		PipelineID:  options.PipelineID,
+		BundlePath:  options.BundlePath,
+	}, provider)
+	if err != nil {
+		return err
+	}
+	return writeInspectResult(options, selection)
+}
+
+func writeInspectResult(options InspectOptions, selection sourceSelection) error {
+	if IsJSONOutput(options.OutputFormat) {
+		return WriteJSONEnvelope(options.Stdout, "inspect", true, selection.Warnings, inspectResultFromSelection(selection), nil)
+	}
+	if err := writeWarnings(options.Stdout, selection.Warnings); err != nil {
+		return err
+	}
+	return writeInspection(options.Stdout, selection)
+}
+
+type inspectResult struct {
+	PipelineID    string               `json:"pipeline_id,omitempty"`
+	SourceBackend string               `json:"source_backend,omitempty"`
+	BundleCount   int                  `json:"bundle_count"`
+	Bundles       []bundleDetailResult `json:"bundles"`
+}
+
+func inspectResultFromSelection(selection sourceSelection) inspectResult {
+	return inspectResult{
+		PipelineID:    selection.PipelineID,
+		SourceBackend: selection.SourceBackend,
+		BundleCount:   len(selection.Bundles),
+		Bundles:       bundleDetailsFromBundles(selection.Bundles),
+	}
+}
+
+func writeInspection(w io.Writer, selection sourceSelection) error {
 	if w == nil {
 		return nil
 	}
-	if _, err := fmt.Fprintf(w, "Bundles: %d\n", len(bundles)); err != nil {
+	if selection.ConfigMode {
+		if _, err := fmt.Fprintf(w, "Pipeline: %s\nSource: %s\n", selection.PipelineID, selection.SourceBackend); err != nil {
+			return err
+		}
+	}
+	if _, err := fmt.Fprintf(w, "Bundles: %d\n", len(selection.Bundles)); err != nil {
 		return err
 	}
-	for _, sourceBundle := range bundles {
+	for _, sourceBundle := range selection.Bundles {
 		if _, err := fmt.Fprintf(
 			w,
 			"- path=%s id=%s created=%s digest=%s files=%d\n",
 			storage.DisplayPath(sourceBundle.RootRelativePath),
 			sourceBundle.Manifest.ID,
-			sourceBundle.Manifest.Created.Format("2006-01-02T15:04:05Z07:00"),
+			formatManifestCreated(sourceBundle.Manifest.Created),
 			sourceBundle.Manifest.Digest,
 			len(sourceBundle.Manifest.Files),
 		); err != nil {

internal/app/inspect_test.go

@@ -3,9 +3,14 @@ package app
 import (
 	"bytes"
 	"context"
+	"encoding/json"
+	"os"
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
 )
 
 func TestInspectPrintsBundleSummary(t *testing.T) {
@@ -32,6 +37,149 @@ func TestInspectPrintsBundleSummary(t *testing.T) {
 	}
 }
 
+func TestInspectConfiguredLocalSource(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "daily", testutil.BundleOptions{ID: "reports.daily"})
+	var stdout bytes.Buffer
+
+	err := Inspect(context.Background(), InspectOptions{
+		ConfigPath: testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
+		PipelineID: "reports",
+		Stdout:     &stdout,
+	})
+
+	if err != nil {
+		t.Fatalf("Inspect() configured source error = %v", err)
+	}
+	output := stdout.String()
+	for _, want := range []string{
+		"Pipeline: reports",
+		"Source: local",
+		"Bundles: 1",
+		"path=daily",
+		"id=reports.daily",
+	} {
+		if !strings.Contains(output, want) {
+			t.Fatalf("Inspect() output = %q, want substring %q", output, want)
+		}
+	}
+}
+
+func TestInspectConfiguredSourceJSON(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{ID: "reports.json"})
+	var stdout bytes.Buffer
+
+	err := Inspect(context.Background(), InspectOptions{
+		ConfigPath:   testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
+		PipelineID:   "reports",
+		Stdout:       &stdout,
+		OutputFormat: OutputFormatJSON,
+	})
+
+	if err != nil {
+		t.Fatalf("Inspect() configured JSON error = %v", err)
+	}
+	result := decodeAppResult(t, stdout.String())
+	if result["pipeline_id"] != "reports" || result["source_backend"] != "local" || result["bundle_count"] != float64(1) {
+		t.Fatalf("result = %#v, want configured inspect metadata", result)
+	}
+}
+
+func TestInspectJSONPreservesCreatedOffsetAndFileMetadata(t *testing.T) {
+	sourceRoot := t.TempDir()
+	created := time.Date(2026, 6, 1, 6, 30, 0, 0, time.FixedZone("CDT", -5*60*60))
+	testutil.WriteSourceBundle(t, sourceRoot, "daily", testutil.BundleOptions{
+		ID:      "reports.offset",
+		Created: created,
+		Files: []testutil.SourceFile{
+			{Path: "report.md", Data: "# Report\n"},
+		},
+	})
+	var stdout bytes.Buffer
+
+	err := Inspect(context.Background(), InspectOptions{
+		Path:         sourceRoot,
+		Stdout:       &stdout,
+		OutputFormat: OutputFormatJSON,
+	})
+
+	if err != nil {
+		t.Fatalf("Inspect() error = %v", err)
+	}
+	result := decodeAppResult(t, stdout.String())
+	bundles, ok := result["bundles"].([]any)
+	if !ok || len(bundles) != 1 {
+		t.Fatalf("bundles = %#v, want one bundle", result["bundles"])
+	}
+	bundle, ok := bundles[0].(map[string]any)
+	if !ok {
+		t.Fatalf("bundle = %#v, want object", bundles[0])
+	}
+	if bundle["created"] != "2026-06-01T06:30:00-05:00" || bundle["file_count"] != float64(1) {
+		t.Fatalf("bundle = %#v, want offset timestamp and file count", bundle)
+	}
+	files, ok := bundle["files"].([]any)
+	if !ok || len(files) != 1 {
+		t.Fatalf("files = %#v, want one file", bundle["files"])
+	}
+	file, ok := files[0].(map[string]any)
+	if !ok || file["path"] != "report.md" || file["sha256"] == "" || file["size"] != float64(9) {
+		t.Fatalf("file = %#v, want projected file metadata", file)
+	}
+}
+
+func TestInspectConfiguredSourceJSONIncludesSecretConflictWarningWithoutValues(t *testing.T) {
+	name := "DISTRIBUTOR_TEST_INSPECT_SECRET"
+	t.Setenv(name, "process-value")
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	secretsRoot := t.TempDir()
+	if err := os.WriteFile(filepath.Join(secretsRoot, name), []byte("secret-value\n"), 0o600); err != nil {
+		t.Fatalf("write secret: %v", err)
+	}
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{ID: "reports.json"})
+	configPath := writeConfigFile(t, `
+secrets:
+  directory: `+secretsRoot+`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: archive
+        backend: local
+        path: `+destinationRoot+`
+`)
+
+	var stdout bytes.Buffer
+	err := Inspect(context.Background(), InspectOptions{
+		ConfigPath:   configPath,
+		PipelineID:   "reports",
+		Stdout:       &stdout,
+		OutputFormat: OutputFormatJSON,
+	})
+	if err != nil {
+		t.Fatalf("Inspect() error = %v", err)
+	}
+	var envelope struct {
+		Warnings []OutputWarning `json:"warnings"`
+	}
+	if err := json.Unmarshal(stdout.Bytes(), &envelope); err != nil {
+		t.Fatalf("decode output: %v; output = %q", err, stdout.String())
+	}
+	if len(envelope.Warnings) != 1 || !strings.Contains(envelope.Warnings[0].Message, "secret "+name+" ignored") {
+		t.Fatalf("warnings = %#v, want secret conflict warning", envelope.Warnings)
+	}
+	output := stdout.String()
+	if strings.Contains(output, "process-value") || strings.Contains(output, "secret-value") {
+		t.Fatalf("stdout exposed secret values: %q", output)
+	}
+}
+
 func TestInspectRequiresPath(t *testing.T) {
 	err := Inspect(context.Background(), InspectOptions{})
 	if err == nil || !strings.Contains(err.Error(), "requires a path") {

internal/app/manifest.go

@@ -0,0 +1,114 @@
+package app
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"path/filepath"
+	"strings"
+	"time"
+
+	producerbundle "gitea.maximumdirect.net/eric/distributor/pkg/bundle"
+)
+
+type ManifestCreateOptions struct {
+	Root         string
+	ID           string
+	Created      string
+	Files        []string
+	Overwrite    bool
+	Stdout       io.Writer
+	OutputFormat OutputFormat
+}
+
+func ManifestCreate(ctx context.Context, options ManifestCreateOptions) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	if options.Root == "" {
+		return fmt.Errorf("manifest create command requires a bundle path")
+	}
+	if options.ID == "" {
+		return fmt.Errorf("manifest create command requires --id")
+	}
+
+	created, err := parseOptionalCreated(options.Created)
+	if err != nil {
+		return err
+	}
+	files := normalizeManifestFiles(options.Files)
+	buildOptions := producerbundle.BuildOptions{
+		Root:    options.Root,
+		ID:      options.ID,
+		Created: created,
+		Files:   files,
+		Scan:    len(files) == 0,
+	}
+	manifest, err := producerbundle.BuildManifest(buildOptions)
+	if err != nil {
+		return err
+	}
+	if err := producerbundle.WriteManifest(options.Root, manifest, producerbundle.WriteManifestOptions{Overwrite: options.Overwrite}); err != nil {
+		return err
+	}
+	loaded, err := producerbundle.LoadManifest(options.Root)
+	if err != nil {
+		return err
+	}
+	if err := producerbundle.ValidateBundle(options.Root, loaded); err != nil {
+		return err
+	}
+
+	result := manifestCreateResultFromManifest(options.Root, loaded)
+	if IsJSONOutput(options.OutputFormat) {
+		return WriteJSONEnvelope(options.Stdout, "manifest create", true, nil, result, nil)
+	}
+	if options.Stdout != nil {
+		_, err = fmt.Fprintf(options.Stdout, "created %s\nbundle: %s\nfiles: %d\ndigest: %s\n", producerbundle.ManifestName, result.ID, result.FileCount, result.Digest)
+	}
+	return err
+}
+
+func parseOptionalCreated(value string) (time.Time, error) {
+	if value == "" {
+		return time.Time{}, nil
+	}
+	created, err := time.Parse(time.RFC3339, value)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("created must be RFC3339: %w", err)
+	}
+	return created, nil
+}
+
+func normalizeManifestFiles(files []string) []string {
+	normalized := make([]string, 0, len(files))
+	for _, file := range files {
+		normalized = append(normalized, filepath.ToSlash(filepath.Clean(strings.ReplaceAll(file, "\\", string(filepath.Separator)))))
+	}
+	return normalized
+}
+
+type manifestCreateResult struct {
+	ManifestPath string               `json:"manifest_path"`
+	Root         string               `json:"root"`
+	ID           string               `json:"id"`
+	Created      string               `json:"created"`
+	Digest       string               `json:"digest"`
+	FileCount    int                  `json:"file_count"`
+	Files        []manifestFileResult `json:"files"`
+}
+
+func manifestCreateResultFromManifest(root string, manifest producerbundle.Manifest) manifestCreateResult {
+	return manifestCreateResult{
+		ManifestPath: filepath.ToSlash(filepath.Join(root, producerbundle.ManifestName)),
+		Root:         filepath.ToSlash(root),
+		ID:           manifest.ID,
+		Created:      formatManifestCreated(manifest.Created),
+		Digest:       manifest.Digest,
+		FileCount:    len(manifest.Files),
+		Files:        manifestFileResults(manifest.Files),
+	}
+}

internal/app/manifest_test.go

@@ -0,0 +1,42 @@
+package app
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestManifestCreateJSONPreservesCreatedOffsetAndFileMetadata(t *testing.T) {
+	root := t.TempDir()
+	if err := os.WriteFile(filepath.Join(root, "report.md"), []byte("# Report\n"), 0o600); err != nil {
+		t.Fatalf("write report: %v", err)
+	}
+	var stdout bytes.Buffer
+
+	err := ManifestCreate(context.Background(), ManifestCreateOptions{
+		Root:         root,
+		ID:           "reports.offset",
+		Created:      "2026-06-01T06:30:00-05:00",
+		Files:        []string{"report.md"},
+		Stdout:       &stdout,
+		OutputFormat: OutputFormatJSON,
+	})
+
+	if err != nil {
+		t.Fatalf("ManifestCreate() error = %v", err)
+	}
+	result := decodeAppResult(t, stdout.String())
+	if result["id"] != "reports.offset" || result["created"] != "2026-06-01T06:30:00-05:00" || result["file_count"] != float64(1) {
+		t.Fatalf("result = %#v, want manifest metadata", result)
+	}
+	files, ok := result["files"].([]any)
+	if !ok || len(files) != 1 {
+		t.Fatalf("files = %#v, want one file", result["files"])
+	}
+	file, ok := files[0].(map[string]any)
+	if !ok || file["path"] != "report.md" || file["sha256"] == "" || file["size"] != float64(9) {
+		t.Fatalf("file = %#v, want projected file metadata", file)
+	}
+}

internal/app/output.go

@@ -0,0 +1,76 @@
+package app
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+)
+
+const outputSchemaVersion = 1
+
+type OutputFormat string
+
+const (
+	OutputFormatText OutputFormat = "text"
+	OutputFormatJSON OutputFormat = "json"
+)
+
+type OutputWarning struct {
+	Message string `json:"message"`
+}
+
+type OutputError struct {
+	PipelineID    string `json:"pipeline_id,omitempty"`
+	DestinationID string `json:"destination_id,omitempty"`
+	Backend       string `json:"backend,omitempty"`
+	BundlePath    string `json:"bundle_path,omitempty"`
+	Message       string `json:"message"`
+}
+
+type outputEnvelope struct {
+	SchemaVersion int             `json:"schema_version"`
+	Command       string          `json:"command"`
+	OK            bool            `json:"ok"`
+	Warnings      []OutputWarning `json:"warnings"`
+	Result        any             `json:"result"`
+	Errors        []OutputError   `json:"errors,omitempty"`
+}
+
+func NormalizeOutputFormat(format OutputFormat) OutputFormat {
+	if format == "" {
+		return OutputFormatText
+	}
+	return format
+}
+
+func ValidateOutputFormat(format OutputFormat) error {
+	switch NormalizeOutputFormat(format) {
+	case OutputFormatText, OutputFormatJSON:
+		return nil
+	default:
+		return fmt.Errorf("format must be text or json")
+	}
+}
+
+func IsJSONOutput(format OutputFormat) bool {
+	return NormalizeOutputFormat(format) == OutputFormatJSON
+}
+
+func WriteJSONEnvelope(w io.Writer, command string, ok bool, warnings []OutputWarning, result any, errors []OutputError) error {
+	if w == nil {
+		return nil
+	}
+	if warnings == nil {
+		warnings = []OutputWarning{}
+	}
+	envelope := outputEnvelope{
+		SchemaVersion: outputSchemaVersion,
+		Command:       command,
+		OK:            ok,
+		Warnings:      warnings,
+		Result:        result,
+		Errors:        errors,
+	}
+	encoder := json.NewEncoder(w)
+	return encoder.Encode(envelope)
+}

internal/app/output_projection.go

@@ -0,0 +1,83 @@
+package app
+
+import (
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+type bundleSummaryResult struct {
+	Path string `json:"path"`
+	ID   string `json:"id"`
+}
+
+type bundleDetailResult struct {
+	Path      string               `json:"path"`
+	ID        string               `json:"id"`
+	Created   string               `json:"created"`
+	Digest    string               `json:"digest"`
+	FileCount int                  `json:"file_count"`
+	TotalSize int64                `json:"total_size"`
+	Files     []manifestFileResult `json:"files"`
+}
+
+type manifestFileResult struct {
+	Path   string `json:"path"`
+	SHA256 string `json:"sha256"`
+	Size   int64  `json:"size"`
+}
+
+func bundleSummaryFromBundle(sourceBundle bundle.Bundle) bundleSummaryResult {
+	return bundleSummaryResult{
+		Path: storage.DisplayPath(sourceBundle.RootRelativePath),
+		ID:   sourceBundle.Manifest.ID,
+	}
+}
+
+func bundleSummariesFromBundles(sourceBundles []bundle.Bundle) []bundleSummaryResult {
+	results := make([]bundleSummaryResult, 0, len(sourceBundles))
+	for _, sourceBundle := range sourceBundles {
+		results = append(results, bundleSummaryFromBundle(sourceBundle))
+	}
+	return results
+}
+
+func bundleDetailFromBundle(sourceBundle bundle.Bundle) bundleDetailResult {
+	result := bundleDetailResult{
+		Path:      storage.DisplayPath(sourceBundle.RootRelativePath),
+		ID:        sourceBundle.Manifest.ID,
+		Created:   formatManifestCreated(sourceBundle.Manifest.Created),
+		Digest:    sourceBundle.Manifest.Digest,
+		FileCount: len(sourceBundle.Manifest.Files),
+		Files:     manifestFileResults(sourceBundle.Manifest.Files),
+	}
+	for _, file := range sourceBundle.Manifest.Files {
+		result.TotalSize += file.Size
+	}
+	return result
+}
+
+func bundleDetailsFromBundles(sourceBundles []bundle.Bundle) []bundleDetailResult {
+	results := make([]bundleDetailResult, 0, len(sourceBundles))
+	for _, sourceBundle := range sourceBundles {
+		results = append(results, bundleDetailFromBundle(sourceBundle))
+	}
+	return results
+}
+
+func manifestFileResults(files []bundle.ManifestFile) []manifestFileResult {
+	results := make([]manifestFileResult, 0, len(files))
+	for _, file := range files {
+		results = append(results, manifestFileResult{
+			Path:   file.Path,
+			SHA256: file.SHA256,
+			Size:   file.Size,
+		})
+	}
+	return results
+}
+
+func formatManifestCreated(created time.Time) string {
+	return created.Format(time.RFC3339)
+}

internal/app/run.go

@@ -2,272 +2,305 @@ package app
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"io"
-	"strings"
 
 	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
 	"gitea.maximumdirect.net/eric/distributor/internal/config"
 	"gitea.maximumdirect.net/eric/distributor/internal/notify"
-	"gitea.maximumdirect.net/eric/distributor/internal/publish"
 	"gitea.maximumdirect.net/eric/distributor/internal/storage"
 )
 
 type RunOptions struct {
+	ConfigPath   string
+	DryRun       bool
+	Force        bool
+	Stdout       io.Writer
+	OutputFormat OutputFormat
+	Notifier     notify.Notifier
+}
+
+type RunPipelineOptions struct {
 	ConfigPath string
+	PipelineID string
 	DryRun     bool
-	Stdout     io.Writer
+	Force      bool
+	Notifier   notify.Notifier
+}
+
+type RunPipelineWithLocalSourceOptions struct {
+	ConfigPath string
+	PipelineID string
+	SourceRoot string
+	DryRun     bool
+	Force      bool
 	Notifier   notify.Notifier
 }
 
 func Run(ctx context.Context, options RunOptions) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
+	}
 	if err := ctx.Err(); err != nil {
 		return err
 	}
 
-	configPath := options.ConfigPath
-	if configPath == "" {
-		configPath = config.DefaultConfigPath
-	}
-	cfg, err := config.LoadFile(configPath)
+	setup, err := loadRuntimeSetup(options.ConfigPath)
 	if err != nil {
 		return err
 	}
-	return runConfig(ctx, cfg, options)
+	return runSetup(ctx, setup, options)
+}
+
+func RunPipeline(ctx context.Context, options RunPipelineOptions) (RunReport, error) {
+	if err := ctx.Err(); err != nil {
+		return RunReport{}, err
+	}
+
+	setup, err := loadRuntimeSetup(options.ConfigPath)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return runPipelineSetup(ctx, setup, options)
+}
+
+func RunPipelineWithLocalSource(ctx context.Context, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+	if err := ctx.Err(); err != nil {
+		return RunReport{}, err
+	}
+	if options.SourceRoot == "" {
+		return RunReport{}, fmt.Errorf("source root is required")
+	}
+
+	setup, err := loadRuntimeSetup(options.ConfigPath)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return runPipelineSetupWithLocalSource(ctx, setup, options)
 }
 
 func runConfig(ctx context.Context, cfg config.Config, options RunOptions) error {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return err
+	}
+	return runSetupWithBackendFactory(ctx, setup, options, newBackendFactoryWithEnvironment)
+}
+
+type backendFactoryProvider func(config.Environment) *backendFactory
+
+func runPipelineConfig(ctx context.Context, cfg config.Config, options RunPipelineOptions) (RunReport, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return runPipelineSetupWithBackendFactory(ctx, setup, options, newBackendFactoryWithEnvironment)
+}
+
+func runPipelineConfigWithLocalSource(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return runPipelineSetupWithLocalSourceAndBackendFactory(ctx, setup, options, newBackendFactoryWithEnvironment)
+}
+
+func runPipelineConfigWithBackendFactory(ctx context.Context, cfg config.Config, options RunPipelineOptions, provider backendFactoryProvider) (RunReport, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return runPipelineSetupWithBackendFactory(ctx, setup, options, provider)
+}
+
+func runPipelineSetup(ctx context.Context, setup runtimeSetup, options RunPipelineOptions) (RunReport, error) {
+	return runPipelineSetupWithBackendFactory(ctx, setup, options, newBackendFactoryWithEnvironment)
+}
+
+func runPipelineSetupWithBackendFactory(ctx context.Context, setup runtimeSetup, options RunPipelineOptions, provider backendFactoryProvider) (RunReport, error) {
+	pipeline, ok := findPipeline(setup.Config, options.PipelineID)
+	if !ok {
+		return RunReport{}, PipelineNotFoundError{ID: options.PipelineID}
+	}
+	return buildRunReportWithSetup(ctx, setup.withPipelines([]config.Pipeline{pipeline}), RunOptions{
+		DryRun:   options.DryRun,
+		Force:    options.Force,
+		Notifier: options.Notifier,
+	}, provider, nil)
+}
+
+func runPipelineConfigWithLocalSourceAndBackendFactory(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions, provider backendFactoryProvider) (RunReport, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return runPipelineSetupWithLocalSourceAndBackendFactory(ctx, setup, options, provider)
+}
+
+func runPipelineSetupWithLocalSource(ctx context.Context, setup runtimeSetup, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+	return runPipelineSetupWithLocalSourceAndBackendFactory(ctx, setup, options, newBackendFactoryWithEnvironment)
+}
+
+func runPipelineSetupWithLocalSourceAndBackendFactory(ctx context.Context, setup runtimeSetup, options RunPipelineWithLocalSourceOptions, provider backendFactoryProvider) (RunReport, error) {
+	pipeline, ok := findPipeline(setup.Config, options.PipelineID)
+	if !ok {
+		return RunReport{}, PipelineNotFoundError{ID: options.PipelineID}
+	}
+	return buildRunReportWithSetup(ctx, setup.withPipelines([]config.Pipeline{pipeline}), RunOptions{
+		DryRun:   options.DryRun,
+		Force:    options.Force,
+		Notifier: options.Notifier,
+	}, provider, &localSourceRoot{
+		pipelineID: options.PipelineID,
+		root:       options.SourceRoot,
+	})
+}
+
+func runConfigWithBackendFactory(ctx context.Context, cfg config.Config, options RunOptions, provider backendFactoryProvider) error {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return err
+	}
+	return runSetupWithBackendFactory(ctx, setup, options, provider)
+}
+
+func runSetup(ctx context.Context, setup runtimeSetup, options RunOptions) error {
+	return runSetupWithBackendFactory(ctx, setup, options, newBackendFactoryWithEnvironment)
+}
+
+func runSetupWithBackendFactory(ctx context.Context, setup runtimeSetup, options RunOptions, provider backendFactoryProvider) error {
+	report, err := buildRunReportWithSetup(ctx, setup, options, provider, nil)
+	if err != nil && !IsPartialResultError(err) {
+		return err
+	}
+	if outputErr := WriteRunReport(options.Stdout, options.OutputFormat, report); outputErr != nil {
+		return outputErr
+	}
+	return err
+}
+
+func buildRunReportWithBackendFactory(ctx context.Context, cfg config.Config, options RunOptions, provider backendFactoryProvider) (RunReport, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return buildRunReportWithSetup(ctx, setup, options, provider, nil)
+}
+
+type localSourceRoot struct {
+	pipelineID string
+	root       string
+}
+
+func buildRunReport(ctx context.Context, cfg config.Config, options RunOptions, provider backendFactoryProvider, sourceRoot *localSourceRoot) (RunReport, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return RunReport{}, err
+	}
+	return buildRunReportWithSetup(ctx, setup, options, provider, sourceRoot)
+}
+
+func buildRunReportWithSetup(ctx context.Context, setup runtimeSetup, options RunOptions, provider backendFactoryProvider, sourceRoot *localSourceRoot) (RunReport, error) {
 	notifier := options.Notifier
 	if notifier == nil {
 		notifier = notify.Noop{}
 	}
 	summary := runSummary{dryRun: options.DryRun}
+	report := RunReport{
+		DryRun:    options.DryRun,
+		Pipelines: []RunPipelineSummary{},
+		Actions:   []RunActionRecord{},
+	}
 	var failures runFailures
-	backends := newBackendFactory()
+	recorder := runReportRecorder{
+		report:   &report,
+		summary:  &summary,
+		failures: &failures,
+	}
+	report.PreambleWarnings = append(report.PreambleWarnings, setup.Warnings...)
+	report.addWarnings(setup.Warnings)
+	backends := provider(setup.Environment)
+	backends.readOnlyKnownHosts = options.DryRun
 	transforms := newTransformRegistry()
-	if options.Stdout != nil {
-		if _, err := fmt.Fprintf(options.Stdout, "Configured pipelines: %d\n", len(cfg.Pipelines)); err != nil {
-			return err
-		}
-	}
-	for _, pipeline := range cfg.Pipelines {
-		sourceBackend, err := backends.openSource(ctx, pipeline.Source)
+	for _, pipeline := range setup.Config.Pipelines {
+		pipelineWarnings := sshWarnings(pipeline)
+		report.addWarnings(pipelineWarnings)
+		sourceBackend, bundles, sourceBackendName, err := openPipelineSource(ctx, backends, pipeline, sourceRoot)
 		if err != nil {
-			return fmt.Errorf("pipeline %s: %w", pipeline.ID, err)
+			return report, err
 		}
-		bundles, err := bundle.Discover(ctx, sourceBackend, "")
-		if err != nil {
-			return fmt.Errorf("pipeline %s discover source bundles: %w", pipeline.ID, err)
-		}
-		if options.Stdout != nil {
-			if _, err := fmt.Fprintf(options.Stdout, "- pipeline=%s source=%s bundles=%d destinations=%s\n", pipeline.ID, pipeline.Source.Backend, len(bundles), destinationSummary(pipeline.Destinations)); err != nil {
-				return err
-			}
-		}
-		for _, sourceBundle := range bundles {
-			for _, destination := range pipeline.Destinations {
-				destinationBackend, err := backends.openDestination(ctx, destination)
-				if err != nil {
-					failures.add(pipeline.ID, destination.ID, storage.DisplayPath(sourceBundle.RootRelativePath), err)
-					summary.recordFailure()
-					if options.Stdout != nil {
-						writeErrorLine(options.Stdout, sourceBundle.RootRelativePath, destination.ID, err)
-					}
-					continue
-				}
-				req := publish.Request{
-					PipelineID:            pipeline.ID,
-					DestinationID:         destination.ID,
-					SourceBundle:          sourceBundle,
-					SourceBackend:         sourceBackend,
-					DestinationBackend:    destinationBackend,
-					DestinationBundlePath: sourceBundle.RootRelativePath,
-					Publish:               *destination.Publish,
-					Transform:             destination.Transform,
-					Transformers:          transforms,
-					Transfer:              destination.Transfer,
-					DistributorVersion:    Version,
-				}
-				plan, err := publish.Build(ctx, req)
-				if err != nil && plan.DestinationID == "" {
-					plan = publish.Plan{DestinationID: destination.ID, BundlePath: sourceBundle.RootRelativePath}
-				}
-				if options.Stdout != nil {
-					writePlanLine(options.Stdout, plan, err)
-				}
-				if err != nil {
-					failures.add(pipeline.ID, destination.ID, storage.DisplayPath(sourceBundle.RootRelativePath), err)
-					summary.recordFailure()
-					continue
-				}
-				summary.recordPlan(plan.Action)
-				if !options.DryRun {
-					if err := publish.Execute(ctx, req, plan); err != nil {
-						failures.add(pipeline.ID, destination.ID, storage.DisplayPath(sourceBundle.RootRelativePath), err)
-						summary.recordFailure()
-						continue
-					}
-					if shouldNotify(plan.Action) {
-						if err := notifier.Notify(ctx, notifyEvent(plan)); err != nil {
-							failures.add(pipeline.ID, destination.ID, storage.DisplayPath(sourceBundle.RootRelativePath), err)
-							summary.recordFailure()
-							continue
-						}
-					}
-				}
-			}
-		}
-	}
-	if options.Stdout != nil {
-		if _, err := fmt.Fprintln(options.Stdout, summary.Line()); err != nil {
-			return err
-		}
-	}
-	if len(failures.items) > 0 {
-		return failures
-	}
-	return nil
-}
-
-func writePlanLine(w io.Writer, plan publish.Plan, planErr error) {
-	if w == nil {
-		return
-	}
-	if planErr != nil {
-		destinationID := plan.DestinationID
-		if destinationID == "" {
-			destinationID = "unknown"
-		}
-		fmt.Fprintf(w, "  - bundle=%s destination=%s action=error reason=%q\n", storage.DisplayPath(plan.BundlePath), destinationID, planErr.Error())
-		return
-	}
-	fmt.Fprintf(w, "  - bundle=%s destination=%s action=%s outputs=%s reason=%q\n", storage.DisplayPath(plan.BundlePath), plan.DestinationID, plan.Action, outputSummary(plan.Outputs), plan.Reason)
-}
-
-func writeErrorLine(w io.Writer, bundlePath, destinationID string, err error) {
-	if w == nil {
-		return
-	}
-	fmt.Fprintf(w, "  - bundle=%s destination=%s action=error reason=%q\n", storage.DisplayPath(bundlePath), destinationID, err.Error())
-}
-
-func outputSummary(outputs []publish.Output) string {
-	if len(outputs) == 0 {
-		return "none"
-	}
-	paths := make([]string, 0, len(outputs))
-	for _, output := range outputs {
-		paths = append(paths, output.DestinationPath)
-	}
-	return strings.Join(paths, ",")
-}
-
-func destinationSummary(destinations []config.Destination) string {
-	if len(destinations) == 0 {
-		return "none"
-	}
-	ids := make([]string, 0, len(destinations))
-	for _, destination := range destinations {
-		ids = append(ids, destination.ID)
-	}
-	return strings.Join(ids, ",")
-}
-
-func shouldNotify(action publish.Action) bool {
-	return action == publish.ActionPublishNew || action == publish.ActionReplaceOlder
-}
-
-func notifyEvent(plan publish.Plan) notify.Event {
-	outputs := make([]notify.Output, 0, len(plan.Outputs))
-	for _, output := range plan.Outputs {
-		outputs = append(outputs, notify.Output{
-			Path:       output.DestinationPath,
-			Kind:       output.Kind,
-			SourcePath: output.SourcePath,
-			Transform:  output.Transform,
-			SHA256:     output.SHA256,
-			Size:       output.Size,
+		report.Pipelines = append(report.Pipelines, RunPipelineSummary{
+			ID:            pipeline.ID,
+			SourceBackend: sourceBackendName,
+			BundleCount:   len(bundles),
+			Destinations:  destinationIDs(pipeline.Destinations),
+			Warnings:      pipelineWarnings,
 		})
+		pipelineIndex := len(report.Pipelines) - 1
+		for _, destination := range pipeline.Destinations {
+			processDestination(ctx, runDestinationRequest{
+				options:       options,
+				notifier:      notifier,
+				backends:      backends,
+				transforms:    transforms,
+				pipeline:      pipeline,
+				pipelineIndex: pipelineIndex,
+				sourceBackend: sourceBackend,
+				bundles:       bundles,
+				destination:   destination,
+				recorder:      &recorder,
+			})
+		}
+		closeBackend(sourceBackend)
 	}
-	return notify.Event{
-		PipelineID:    plan.PipelineID,
-		DestinationID: plan.DestinationID,
-		BundleID:      plan.BundleID,
-		BundlePath:    plan.BundlePath,
-		Action:        string(plan.Action),
-		Outputs:       outputs,
+	report.Summary = summary.Result()
+	report.OutputErrors = failures.outputErrors()
+	if len(failures.items) > 0 {
+		return report, failures
 	}
+	return report, nil
 }
 
-type runSummary struct {
-	dryRun       bool
-	planned      int
-	publishNew   int
-	replaceOlder int
-	skipped      int
-	failures     int
+type runReportRecorder struct {
+	report   *RunReport
+	summary  *runSummary
+	failures *runFailures
 }
 
-func (s *runSummary) recordPlan(action publish.Action) {
-	s.planned++
-	switch action {
-	case publish.ActionPublishNew:
-		s.publishNew++
-	case publish.ActionReplaceOlder:
-		s.replaceOlder++
-	case publish.ActionSkipSame, publish.ActionSkipDestinationNewer:
-		s.skipped++
+func openPipelineSource(ctx context.Context, backends *backendFactory, pipeline config.Pipeline, sourceRoot *localSourceRoot) (storage.Backend, []bundle.Bundle, string, error) {
+	if sourceRoot != nil && sourceRoot.pipelineID == pipeline.ID {
+		sourceBackend, err := backends.openLocalPath(ctx, sourceRoot.root)
+		if err != nil {
+			return nil, nil, config.BackendLocal, fmt.Errorf("pipeline %s source backend %s: %w", pipeline.ID, config.BackendLocal, err)
+		}
+		sourceBundle, err := bundle.Validate(ctx, sourceBackend, "")
+		if err != nil {
+			closeBackend(sourceBackend)
+			return nil, nil, config.BackendLocal, fmt.Errorf("pipeline %s source backend %s validate source bundle: %w", pipeline.ID, config.BackendLocal, err)
+		}
+		return sourceBackend, []bundle.Bundle{sourceBundle}, config.BackendLocal, nil
 	}
-}
 
-func (s *runSummary) recordFailure() {
-	s.failures++
-}
-
-func (s runSummary) Line() string {
-	status := "ok"
-	if s.failures > 0 {
-		status = "failed"
+	sourceBackend, err := backends.openSource(ctx, pipeline.Source)
+	if err != nil {
+		return nil, nil, pipeline.Source.Backend, fmt.Errorf("pipeline %s source backend %s: %w", pipeline.ID, pipeline.Source.Backend, err)
 	}
-	return fmt.Sprintf("Final status: %s planned=%d publish_new=%d replace_older=%d skipped=%d failed=%d dry_run=%t", status, s.planned, s.publishNew, s.replaceOlder, s.skipped, s.failures, s.dryRun)
-}
-
-type runFailure struct {
-	pipelineID    string
-	destinationID string
-	bundlePath    string
-	err           error
-}
-
-type runFailures struct {
-	items []runFailure
-}
-
-func (f *runFailures) add(pipelineID, destinationID, bundlePath string, err error) {
-	f.items = append(f.items, runFailure{
-		pipelineID:    pipelineID,
-		destinationID: destinationID,
-		bundlePath:    bundlePath,
-		err:           err,
-	})
-}
-
-func (f runFailures) Error() string {
-	if len(f.items) == 0 {
-		return ""
+	bundles, err := bundle.Discover(ctx, sourceBackend, "")
+	if err != nil {
+		closeBackend(sourceBackend)
+		return nil, nil, pipeline.Source.Backend, fmt.Errorf("pipeline %s source backend %s discover source bundles: %w", pipeline.ID, pipeline.Source.Backend, err)
 	}
-	parts := make([]string, 0, len(f.items))
-	for _, item := range f.items {
-		parts = append(parts, fmt.Sprintf("pipeline %s destination %s bundle %s: %v", item.pipelineID, item.destinationID, item.bundlePath, item.err))
-	}
-	return "run failed: " + strings.Join(parts, "; ")
+	return sourceBackend, bundles, pipeline.Source.Backend, nil
 }
 
-func (f runFailures) Unwrap() error {
-	errs := make([]error, 0, len(f.items))
-	for _, item := range f.items {
-		errs = append(errs, item.err)
-	}
-	return errors.Join(errs...)
+type closeableBackend interface {
+	Close() error
+}
+
+func closeBackend(backend storage.Backend) {
+	closeable, ok := backend.(closeableBackend)
+	if !ok {
+		return
+	}
+	_ = closeable.Close()
 }

internal/app/run_destination.go

@@ -0,0 +1,163 @@
+package app
+
+import (
+	"context"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/notify"
+	"gitea.maximumdirect.net/eric/distributor/internal/publish"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+type runDestinationRequest struct {
+	options       RunOptions
+	notifier      notify.Notifier
+	backends      *backendFactory
+	transforms    publish.TransformerResolver
+	pipeline      config.Pipeline
+	pipelineIndex int
+	sourceBackend storage.Backend
+	bundles       []bundle.Bundle
+	destination   config.Destination
+	recorder      *runReportRecorder
+}
+
+func processDestination(ctx context.Context, request runDestinationRequest) {
+	selections := selectDestinationBundles(request.destination, request.bundles)
+	if isFixedPathDestination(request.destination) {
+		request.recorder.summary.recordFixedPath()
+		if request.options.DryRun {
+			warning := fixedPathSelectionWarning(request.pipeline.ID, request.destination.ID, selections, len(request.bundles))
+			request.recorder.addPipelineWarning(request.pipelineIndex, warning)
+		}
+	}
+	if len(selections) == 0 {
+		return
+	}
+	destinationBackend, err := request.backends.openDestination(ctx, request.destination)
+	if err != nil {
+		for _, selection := range selections {
+			sourceBundle := selection.SourceBundle
+			request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
+				pipelineID:    request.pipeline.ID,
+				destinationID: request.destination.ID,
+				backend:       request.destination.Backend,
+				bundlePath:    sourceBundle.RootRelativePath,
+				err:           err,
+			}, errorAction(request.pipeline.ID, request.destination.ID, request.destination.Backend, sourceBundle.RootRelativePath, err), true)
+		}
+		return
+	}
+	defer closeBackend(destinationBackend)
+
+	for _, selection := range selections {
+		processDestinationSelection(ctx, request, destinationBackend, selection)
+	}
+}
+
+func processDestinationSelection(ctx context.Context, request runDestinationRequest, destinationBackend storage.Backend, selection destinationBundleSelection) {
+	sourceBundle := selection.SourceBundle
+	publishRequest := publish.Request{
+		PipelineID:            request.pipeline.ID,
+		DestinationID:         request.destination.ID,
+		SourceBundle:          sourceBundle,
+		SourceBackend:         request.sourceBackend,
+		DestinationBackend:    destinationBackend,
+		DestinationBundlePath: selection.DestinationBundlePath,
+		PathMapping:           request.destination.PathMap.Mode,
+		Publish:               *request.destination.Publish,
+		Transform:             request.destination.Transform,
+		Links:                 request.destination.Links,
+		Transformers:          request.transforms,
+		Transfer:              request.destination.Transfer,
+		DistributorVersion:    Version,
+		Force:                 request.options.Force,
+	}
+	plan, err := publish.Build(ctx, publishRequest)
+	if err != nil {
+		plan = completePlanIdentity(plan, request.pipeline, request.destination, selection)
+	}
+	if isFixedPathDestination(request.destination) {
+		plan.PathMapping = config.PathMappingFixed
+		if request.options.DryRun && isDestructiveFixedPathAction(plan.Action) {
+			warning := fixedPathReplacementWarning(plan)
+			request.recorder.addPipelineWarning(request.pipelineIndex, warning)
+		}
+	}
+	action := runActionFromPlan(request.destination.Backend, plan, err)
+	if err != nil {
+		request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
+			pipelineID:    request.pipeline.ID,
+			destinationID: request.destination.ID,
+			backend:       request.destination.Backend,
+			bundlePath:    sourceBundle.RootRelativePath,
+			err:           err,
+		}, action, true)
+		return
+	}
+	request.recorder.addPipelineAction(request.pipelineIndex, action)
+	request.recorder.summary.recordPlan(plan.Action)
+	if request.options.DryRun {
+		return
+	}
+	if err := publish.Execute(ctx, publishRequest, plan); err != nil {
+		request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
+			pipelineID:    request.pipeline.ID,
+			destinationID: request.destination.ID,
+			backend:       request.destination.Backend,
+			bundlePath:    sourceBundle.RootRelativePath,
+			err:           err,
+		}, RunActionRecord{}, false)
+		return
+	}
+	if shouldNotify(plan.Action) {
+		if err := request.notifier.Notify(ctx, notifyEvent(plan)); err != nil {
+			request.recorder.recordDestinationFailure(request.pipelineIndex, runFailure{
+				pipelineID:    request.pipeline.ID,
+				destinationID: request.destination.ID,
+				backend:       request.destination.Backend,
+				bundlePath:    sourceBundle.RootRelativePath,
+				err:           err,
+			}, RunActionRecord{}, false)
+			return
+		}
+	}
+}
+
+func (recorder *runReportRecorder) addPipelineWarning(pipelineIndex int, warning OutputWarning) {
+	recorder.report.addWarning(warning)
+	recorder.report.Pipelines[pipelineIndex].events = append(recorder.report.Pipelines[pipelineIndex].events, warningEvent(warning))
+}
+
+func (recorder *runReportRecorder) addPipelineAction(pipelineIndex int, action RunActionRecord) {
+	recorder.report.Actions = append(recorder.report.Actions, action)
+	recorder.report.Pipelines[pipelineIndex].events = append(recorder.report.Pipelines[pipelineIndex].events, actionEvent(len(recorder.report.Actions)-1))
+}
+
+func (recorder *runReportRecorder) recordDestinationFailure(pipelineIndex int, failure runFailure, action RunActionRecord, includeAction bool) {
+	recorder.failures.add(failure.pipelineID, failure.destinationID, failure.backend, storage.DisplayPath(failure.bundlePath), failure.err)
+	recorder.summary.recordFailure()
+	if includeAction {
+		recorder.addPipelineAction(pipelineIndex, action)
+	}
+}
+
+func completePlanIdentity(plan publish.Plan, pipeline config.Pipeline, destination config.Destination, selection destinationBundleSelection) publish.Plan {
+	if plan.PipelineID == "" {
+		plan.PipelineID = pipeline.ID
+	}
+	if plan.DestinationID == "" {
+		plan.DestinationID = destination.ID
+	}
+	if plan.BundleID == "" {
+		plan.BundleID = selection.SourceBundle.Manifest.ID
+	}
+	if plan.BundlePath == "" {
+		plan.BundlePath = selection.SourceBundle.RootRelativePath
+	}
+	if plan.DestinationBundlePath == "" {
+		plan.DestinationBundlePath = selection.DestinationBundlePath
+	}
+	return plan
+}

internal/app/run_failures.go

@@ -0,0 +1,70 @@
+package app
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+type runFailure struct {
+	pipelineID    string
+	destinationID string
+	backend       string
+	bundlePath    string
+	err           error
+}
+
+type runFailures struct {
+	items []runFailure
+}
+
+func (f *runFailures) add(pipelineID, destinationID, backend, bundlePath string, err error) {
+	f.items = append(f.items, runFailure{
+		pipelineID:    pipelineID,
+		destinationID: destinationID,
+		backend:       backend,
+		bundlePath:    bundlePath,
+		err:           err,
+	})
+}
+
+func (f runFailures) Error() string {
+	if len(f.items) == 0 {
+		return ""
+	}
+	parts := make([]string, 0, len(f.items))
+	for _, item := range f.items {
+		parts = append(parts, fmt.Sprintf("pipeline %s destination %s backend %s bundle %s: %v", item.pipelineID, item.destinationID, item.backend, item.bundlePath, item.err))
+	}
+	return "run failed: " + strings.Join(parts, "; ")
+}
+
+func (f runFailures) outputErrors() []OutputError {
+	if len(f.items) == 0 {
+		return nil
+	}
+	errors := make([]OutputError, 0, len(f.items))
+	for _, item := range f.items {
+		errors = append(errors, OutputError{
+			PipelineID:    item.pipelineID,
+			DestinationID: item.destinationID,
+			Backend:       item.backend,
+			BundlePath:    item.bundlePath,
+			Message:       item.err.Error(),
+		})
+	}
+	return errors
+}
+
+func IsPartialResultError(err error) bool {
+	var failures runFailures
+	return errors.As(err, &failures)
+}
+
+func (f runFailures) Unwrap() error {
+	errs := make([]error, 0, len(f.items))
+	for _, item := range f.items {
+		errs = append(errs, item.err)
+	}
+	return errors.Join(errs...)
+}

internal/app/run_notify.go

@@ -0,0 +1,33 @@
+package app
+
+import (
+	"gitea.maximumdirect.net/eric/distributor/internal/notify"
+	"gitea.maximumdirect.net/eric/distributor/internal/publish"
+)
+
+func shouldNotify(action publish.Action) bool {
+	return action == publish.ActionPublishNew || action == publish.ActionReplaceOlder || action == publish.ActionForceReplace
+}
+
+func notifyEvent(plan publish.Plan) notify.Event {
+	outputs := make([]notify.Output, 0, len(plan.Outputs))
+	for _, output := range plan.Outputs {
+		stateOutput := output.StateOutputFile()
+		outputs = append(outputs, notify.Output{
+			Path:       stateOutput.Path,
+			Kind:       stateOutput.Kind,
+			SourcePath: stateOutput.SourcePath,
+			Transform:  stateOutput.Transform,
+			SHA256:     stateOutput.SHA256,
+			Size:       stateOutput.Size,
+		})
+	}
+	return notify.Event{
+		PipelineID:    plan.PipelineID,
+		DestinationID: plan.DestinationID,
+		BundleID:      plan.BundleID,
+		BundlePath:    plan.BundlePath,
+		Action:        string(plan.Action),
+		Outputs:       outputs,
+	}
+}

internal/app/run_output.go

@@ -0,0 +1,218 @@
+package app
+
+import (
+	"fmt"
+	"io"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/publish"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+func WriteRunReport(w io.Writer, format OutputFormat, report RunReport) error {
+	if IsJSONOutput(format) {
+		return WriteJSONEnvelope(w, "run", len(report.OutputErrors) == 0, report.Warnings, report, report.OutputErrors)
+	}
+	return writeRunReportText(w, report)
+}
+
+func writeRunReportText(w io.Writer, report RunReport) error {
+	if w == nil {
+		return nil
+	}
+	if err := writeWarnings(w, report.PreambleWarnings); err != nil {
+		return err
+	}
+	if _, err := fmt.Fprintf(w, "Configured pipelines: %d\n", len(report.Pipelines)); err != nil {
+		return err
+	}
+	for _, pipeline := range report.Pipelines {
+		if err := writeWarnings(w, pipeline.Warnings); err != nil {
+			return err
+		}
+		if _, err := fmt.Fprintf(w, "- pipeline=%s source=%s bundles=%d destinations=%s\n", pipeline.ID, pipeline.SourceBackend, pipeline.BundleCount, destinationIDSummary(pipeline.Destinations)); err != nil {
+			return err
+		}
+		for _, event := range pipeline.events {
+			if event.warning != nil {
+				if err := writeWarnings(w, []OutputWarning{*event.warning}); err != nil {
+					return err
+				}
+				continue
+			}
+			if event.actionIndex < 0 || event.actionIndex >= len(report.Actions) {
+				continue
+			}
+			writeRunActionLine(w, report.Actions[event.actionIndex])
+		}
+	}
+	_, err := fmt.Fprintln(w, report.Summary.Line())
+	return err
+}
+
+func writeRunActionLine(w io.Writer, action RunActionRecord) {
+	if action.Action == "error" {
+		destinationID := action.DestinationID
+		if destinationID == "" {
+			destinationID = "unknown"
+		}
+		fmt.Fprintf(w, "  - bundle=%s destination=%s backend=%s%s action=error reason=%q\n", action.BundlePath, destinationID, action.Backend, pathMappingRecordSummary(action), action.Reason)
+		return
+	}
+	fmt.Fprintf(w, "  - bundle=%s destination=%s backend=%s%s action=%s outputs=%s reason=%q\n", action.BundlePath, action.DestinationID, action.Backend, pathMappingRecordSummary(action), action.Action, outputRecordSummary(action.Outputs), action.Reason)
+}
+
+func pathMappingRecordSummary(action RunActionRecord) string {
+	if action.PathMapping != config.PathMappingFixed {
+		return ""
+	}
+	return fmt.Sprintf(" path_mapping=fixed target=%s", action.DestinationPath)
+}
+
+func outputRecordSummary(outputs []RunOutputRecord) string {
+	if len(outputs) == 0 {
+		return "none"
+	}
+	paths := make([]string, 0, len(outputs))
+	for _, output := range outputs {
+		paths = append(paths, output.Path)
+	}
+	return strings.Join(paths, ",")
+}
+
+func destinationIDSummary(ids []string) string {
+	if len(ids) == 0 {
+		return "none"
+	}
+	return strings.Join(ids, ",")
+}
+
+type RunReport struct {
+	DryRun           bool                 `json:"dry_run"`
+	Pipelines        []RunPipelineSummary `json:"pipelines"`
+	Actions          []RunActionRecord    `json:"actions"`
+	Summary          RunSummaryCounters   `json:"summary"`
+	Warnings         []OutputWarning      `json:"-"`
+	OutputErrors     []OutputError        `json:"-"`
+	PreambleWarnings []OutputWarning      `json:"-"`
+}
+
+func (r *RunReport) addWarning(warning OutputWarning) {
+	r.Warnings = append(r.Warnings, warning)
+}
+
+func (r *RunReport) addWarnings(warnings []OutputWarning) {
+	r.Warnings = append(r.Warnings, warnings...)
+}
+
+type RunPipelineSummary struct {
+	ID            string          `json:"id"`
+	SourceBackend string          `json:"source_backend"`
+	BundleCount   int             `json:"bundle_count"`
+	Destinations  []string        `json:"destinations"`
+	Warnings      []OutputWarning `json:"-"`
+	events        []runPipelineEvent
+}
+
+type runPipelineEvent struct {
+	warning     *OutputWarning
+	actionIndex int
+}
+
+func warningEvent(warning OutputWarning) runPipelineEvent {
+	return runPipelineEvent{warning: &warning, actionIndex: -1}
+}
+
+func actionEvent(actionIndex int) runPipelineEvent {
+	return runPipelineEvent{actionIndex: actionIndex}
+}
+
+type RunActionRecord struct {
+	PipelineID      string            `json:"pipeline_id,omitempty"`
+	DestinationID   string            `json:"destination_id"`
+	Backend         string            `json:"backend"`
+	BundleID        string            `json:"bundle_id,omitempty"`
+	BundlePath      string            `json:"bundle_path"`
+	DestinationPath string            `json:"destination_path"`
+	PathMapping     string            `json:"path_mapping,omitempty"`
+	Action          string            `json:"action"`
+	PrimaryURL      string            `json:"primary_url,omitempty"`
+	Reason          string            `json:"reason,omitempty"`
+	Outputs         []RunOutputRecord `json:"outputs"`
+}
+
+type RunOutputRecord struct {
+	Path       string `json:"path"`
+	Kind       string `json:"kind"`
+	SourcePath string `json:"source_path,omitempty"`
+	Transform  string `json:"transform,omitempty"`
+	URL        string `json:"url,omitempty"`
+	SHA256     string `json:"sha256"`
+	Size       int64  `json:"size"`
+}
+
+func runActionFromPlan(backend string, plan publish.Plan, planErr error) RunActionRecord {
+	if planErr != nil {
+		destinationID := plan.DestinationID
+		if destinationID == "" {
+			destinationID = "unknown"
+		}
+		return RunActionRecord{
+			PipelineID:      plan.PipelineID,
+			DestinationID:   destinationID,
+			Backend:         backend,
+			BundleID:        plan.BundleID,
+			BundlePath:      storage.DisplayPath(plan.BundlePath),
+			DestinationPath: storage.DisplayPath(plan.DestinationBundlePath),
+			PathMapping:     plan.PathMapping,
+			Action:          "error",
+			PrimaryURL:      plan.PrimaryURL,
+			Reason:          planErr.Error(),
+			Outputs:         []RunOutputRecord{},
+		}
+	}
+	return RunActionRecord{
+		PipelineID:      plan.PipelineID,
+		DestinationID:   plan.DestinationID,
+		Backend:         backend,
+		BundleID:        plan.BundleID,
+		BundlePath:      storage.DisplayPath(plan.BundlePath),
+		DestinationPath: storage.DisplayPath(plan.DestinationBundlePath),
+		PathMapping:     plan.PathMapping,
+		Action:          string(plan.Action),
+		PrimaryURL:      plan.PrimaryURL,
+		Reason:          plan.Reason,
+		Outputs:         runOutputsFromPlan(plan.Outputs),
+	}
+}
+
+func errorAction(pipelineID, destinationID, backend, bundlePath string, err error) RunActionRecord {
+	return RunActionRecord{
+		PipelineID:      pipelineID,
+		DestinationID:   destinationID,
+		Backend:         backend,
+		BundlePath:      storage.DisplayPath(bundlePath),
+		DestinationPath: storage.DisplayPath(bundlePath),
+		Action:          "error",
+		Reason:          err.Error(),
+		Outputs:         []RunOutputRecord{},
+	}
+}
+
+func runOutputsFromPlan(outputs []publish.Output) []RunOutputRecord {
+	results := make([]RunOutputRecord, 0, len(outputs))
+	for _, output := range outputs {
+		stateOutput := output.StateOutputFile()
+		results = append(results, RunOutputRecord{
+			Path:       stateOutput.Path,
+			Kind:       stateOutput.Kind,
+			SourcePath: stateOutput.SourcePath,
+			Transform:  stateOutput.Transform,
+			URL:        stateOutput.URL,
+			SHA256:     stateOutput.SHA256,
+			Size:       stateOutput.Size,
+		})
+	}
+	return results
+}

internal/app/run_selection.go

@@ -0,0 +1,79 @@
+package app
+
+import (
+	"fmt"
+	"sort"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/publish"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+type destinationBundleSelection struct {
+	SourceBundle          bundle.Bundle
+	DestinationBundlePath string
+}
+
+func selectDestinationBundles(destination config.Destination, bundles []bundle.Bundle) []destinationBundleSelection {
+	if !isFixedPathDestination(destination) {
+		selections := make([]destinationBundleSelection, 0, len(bundles))
+		for _, sourceBundle := range bundles {
+			selections = append(selections, destinationBundleSelection{
+				SourceBundle:          sourceBundle,
+				DestinationBundlePath: sourceBundle.RootRelativePath,
+			})
+		}
+		return selections
+	}
+	if len(bundles) == 0 {
+		return nil
+	}
+	sourceBundle := newestBundle(bundles)
+	return []destinationBundleSelection{{
+		SourceBundle:          sourceBundle,
+		DestinationBundlePath: "",
+	}}
+}
+
+func newestBundle(bundles []bundle.Bundle) bundle.Bundle {
+	if len(bundles) == 0 {
+		return bundle.Bundle{}
+	}
+	sorted := append([]bundle.Bundle(nil), bundles...)
+	sort.Slice(sorted, func(i, j int) bool {
+		if sorted[i].Manifest.Created.Equal(sorted[j].Manifest.Created) {
+			return sorted[i].RootRelativePath < sorted[j].RootRelativePath
+		}
+		return sorted[i].Manifest.Created.After(sorted[j].Manifest.Created)
+	})
+	return sorted[0]
+}
+
+func isFixedPathDestination(destination config.Destination) bool {
+	return destination.PathMap.Mode == config.PathMappingFixed
+}
+
+func fixedPathSelectionWarning(pipelineID, destinationID string, selections []destinationBundleSelection, candidateCount int) OutputWarning {
+	selected := "none"
+	if len(selections) > 0 {
+		selected = storage.DisplayPath(selections[0].SourceBundle.RootRelativePath)
+	}
+	return OutputWarning{Message: fmt.Sprintf("pipeline=%s destination=%s path_mapping=fixed candidates=%d selected_bundle=%s destination_bundle=.", pipelineID, destinationID, candidateCount, selected)}
+}
+
+func isDestructiveFixedPathAction(action publish.Action) bool {
+	return action == publish.ActionReplaceOlder || action == publish.ActionForceReplace
+}
+
+func fixedPathReplacementWarning(plan publish.Plan) OutputWarning {
+	return OutputWarning{Message: fmt.Sprintf("pipeline=%s destination=%s path_mapping=fixed action=%s replaces destination root for selected_bundle=%s", plan.PipelineID, plan.DestinationID, plan.Action, storage.DisplayPath(plan.BundlePath))}
+}
+
+func destinationIDs(destinations []config.Destination) []string {
+	ids := make([]string, 0, len(destinations))
+	for _, destination := range destinations {
+		ids = append(ids, destination.ID)
+	}
+	return ids
+}

internal/app/run_summary.go

@@ -0,0 +1,74 @@
+package app
+
+import (
+	"fmt"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/publish"
+)
+
+type runSummary struct {
+	dryRun       bool
+	planned      int
+	publishNew   int
+	replaceOlder int
+	forceReplace int
+	skipped      int
+	failures     int
+	fixedPath    int
+}
+
+func (s *runSummary) recordPlan(action publish.Action) {
+	s.planned++
+	switch action {
+	case publish.ActionPublishNew:
+		s.publishNew++
+	case publish.ActionReplaceOlder:
+		s.replaceOlder++
+	case publish.ActionForceReplace:
+		s.forceReplace++
+	case publish.ActionSkipSame, publish.ActionSkipDestinationNewer:
+		s.skipped++
+	}
+}
+
+func (s *runSummary) recordFailure() {
+	s.failures++
+}
+
+func (s *runSummary) recordFixedPath() {
+	s.fixedPath++
+}
+
+type RunSummaryCounters struct {
+	Status       string `json:"status"`
+	Planned      int    `json:"planned"`
+	PublishNew   int    `json:"publish_new"`
+	ReplaceOlder int    `json:"replace_older"`
+	ForceReplace int    `json:"force_replace"`
+	Skipped      int    `json:"skipped"`
+	Failed       int    `json:"failed"`
+	DryRun       bool   `json:"dry_run"`
+	FixedPath    int    `json:"fixed_path"`
+}
+
+func (s RunSummaryCounters) Line() string {
+	return fmt.Sprintf("Final status: %s planned=%d publish_new=%d replace_older=%d force_replace=%d skipped=%d failed=%d dry_run=%t fixed_path=%d", s.Status, s.Planned, s.PublishNew, s.ReplaceOlder, s.ForceReplace, s.Skipped, s.Failed, s.DryRun, s.FixedPath)
+}
+
+func (s runSummary) Result() RunSummaryCounters {
+	status := "ok"
+	if s.failures > 0 {
+		status = "failed"
+	}
+	return RunSummaryCounters{
+		Status:       status,
+		Planned:      s.planned,
+		PublishNew:   s.publishNew,
+		ReplaceOlder: s.replaceOlder,
+		ForceReplace: s.forceReplace,
+		Skipped:      s.skipped,
+		Failed:       s.failures,
+		DryRun:       s.dryRun,
+		FixedPath:    s.fixedPath,
+	}
+}

internal/app/run_warnings.go

@@ -0,0 +1,47 @@
+package app
+
+import (
+	"fmt"
+	"io"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+)
+
+func secretConflictWarnings(conflicts []config.SecretConflict) []OutputWarning {
+	warnings := make([]OutputWarning, 0, len(conflicts))
+	for _, conflict := range conflicts {
+		warnings = append(warnings, OutputWarning{
+			Message: fmt.Sprintf("secret %s ignored because the real environment already has that variable", conflict.Name),
+		})
+	}
+	return warnings
+}
+
+func sshWarnings(pipeline config.Pipeline) []OutputWarning {
+	var warnings []OutputWarning
+	if pipeline.Source.Backend == config.BackendSSH && pipeline.Source.SSH.HostKeyPolicy == config.HostKeyPolicyOff {
+		warnings = append(warnings, OutputWarning{
+			Message: fmt.Sprintf("pipeline=%s source host_key_policy=off disables SSH host key checking", pipeline.ID),
+		})
+	}
+	for _, destination := range pipeline.Destinations {
+		if destination.Backend == config.BackendSSH && destination.SSH.HostKeyPolicy == config.HostKeyPolicyOff {
+			warnings = append(warnings, OutputWarning{
+				Message: fmt.Sprintf("pipeline=%s destination=%s host_key_policy=off disables SSH host key checking", pipeline.ID, destination.ID),
+			})
+		}
+	}
+	return warnings
+}
+
+func writeWarnings(w io.Writer, warnings []OutputWarning) error {
+	if w == nil {
+		return nil
+	}
+	for _, warning := range warnings {
+		if _, err := fmt.Fprintf(w, "Warning: %s\n", warning.Message); err != nil {
+			return err
+		}
+	}
+	return nil
+}

internal/app/runtime.go

@@ -0,0 +1,44 @@
+package app
+
+import "gitea.maximumdirect.net/eric/distributor/internal/config"
+
+type runtimeSetup struct {
+	ConfigPath  string
+	Config      config.Config
+	Environment config.Environment
+	Warnings    []OutputWarning
+}
+
+func loadRuntimeSetup(configPath string) (runtimeSetup, error) {
+	resolvedPath := runtimeConfigPath(configPath)
+	cfg, err := config.LoadFile(resolvedPath)
+	if err != nil {
+		return runtimeSetup{}, err
+	}
+	return runtimeSetupFromConfig(resolvedPath, cfg)
+}
+
+func runtimeSetupFromConfig(configPath string, cfg config.Config) (runtimeSetup, error) {
+	secretLoad, err := config.LoadSecretEnvironment(cfg.Secrets.Directory, nil)
+	if err != nil {
+		return runtimeSetup{}, err
+	}
+	return runtimeSetup{
+		ConfigPath:  configPath,
+		Config:      cfg,
+		Environment: secretLoad.Environment,
+		Warnings:    secretConflictWarnings(secretLoad.Conflicts),
+	}, nil
+}
+
+func runtimeConfigPath(configPath string) string {
+	if configPath == "" {
+		return config.DefaultConfigPath
+	}
+	return configPath
+}
+
+func (setup runtimeSetup) withPipelines(pipelines []config.Pipeline) runtimeSetup {
+	setup.Config.Pipelines = pipelines
+	return setup
+}

internal/app/runtime_test.go

@@ -0,0 +1,32 @@
+package app
+
+import (
+	"testing"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
+)
+
+func TestRuntimeConfigPathDefaultsEmptyPath(t *testing.T) {
+	if got, want := runtimeConfigPath(""), config.DefaultConfigPath; got != want {
+		t.Fatalf("runtimeConfigPath(\"\") = %q, want %q", got, want)
+	}
+	if got, want := runtimeConfigPath("/tmp/distributor.yml"), "/tmp/distributor.yml"; got != want {
+		t.Fatalf("runtimeConfigPath(explicit) = %q, want %q", got, want)
+	}
+}
+
+func TestLoadRuntimeSetupReturnsLoadedConfigPath(t *testing.T) {
+	configPath := testutil.WriteMinimalLocalConfig(t, t.TempDir(), t.TempDir())
+
+	setup, err := loadRuntimeSetup(configPath)
+	if err != nil {
+		t.Fatalf("loadRuntimeSetup() error = %v", err)
+	}
+	if setup.ConfigPath != configPath {
+		t.Fatalf("ConfigPath = %q, want %q", setup.ConfigPath, configPath)
+	}
+	if len(setup.Config.Pipelines) != 1 {
+		t.Fatalf("pipeline count = %d, want 1", len(setup.Config.Pipelines))
+	}
+}

internal/app/serve.go

@@ -0,0 +1,52 @@
+package app
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+)
+
+type ServeOptions struct {
+	ConfigPath string
+}
+
+func Serve(ctx context.Context, options ServeOptions) error {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	setup, err := loadRuntimeSetup(options.ConfigPath)
+	if err != nil {
+		return err
+	}
+
+	handler, err := newUploadHTTPHandler(ctx, setup.Config, setup.Environment)
+	if err != nil {
+		return err
+	}
+	listener, err := net.Listen("tcp", setup.Config.Server.HTTP.Bind)
+	if err != nil {
+		return fmt.Errorf("bind HTTP server %q: %w", setup.Config.Server.HTTP.Bind, err)
+	}
+	defer listener.Close()
+
+	server := &http.Server{Handler: handler}
+	shutdownDone := make(chan struct{})
+	go func() {
+		defer close(shutdownDone)
+		<-ctx.Done()
+		_ = server.Shutdown(context.Background())
+	}()
+
+	err = server.Serve(listener)
+	if errors.Is(err, http.ErrServerClosed) {
+		<-shutdownDone
+		return nil
+	}
+	return err
+}

internal/app/serve_test.go

@@ -0,0 +1,88 @@
+package app
+
+import (
+	"context"
+	"strings"
+	"testing"
+)
+
+func TestServeFailsForUnsafeUploadTokensWithoutLeakingValues(t *testing.T) {
+	duplicateSecret := "duplicate-secret"
+	tests := []struct {
+		name       string
+		configPath func(*testing.T) string
+		env        map[string]string
+		want       string
+	}{
+		{
+			name: "missing token",
+			configPath: func(t *testing.T) string {
+				return writeServeUploadConfig(t, []string{"DISTRIBUTOR_TEST_MISSING_UPLOAD_TOKEN"})
+			},
+			want: "DISTRIBUTOR_TEST_MISSING_UPLOAD_TOKEN",
+		},
+		{
+			name: "empty token",
+			configPath: func(t *testing.T) string {
+				return writeServeUploadConfig(t, []string{"DISTRIBUTOR_TEST_EMPTY_UPLOAD_TOKEN"})
+			},
+			env:  map[string]string{"DISTRIBUTOR_TEST_EMPTY_UPLOAD_TOKEN": ""},
+			want: "DISTRIBUTOR_TEST_EMPTY_UPLOAD_TOKEN",
+		},
+		{
+			name: "duplicate token",
+			configPath: func(t *testing.T) string {
+				return writeServeUploadConfig(t, []string{
+					"DISTRIBUTOR_TEST_FIRST_UPLOAD_TOKEN",
+					"DISTRIBUTOR_TEST_SECOND_UPLOAD_TOKEN",
+				})
+			},
+			env: map[string]string{
+				"DISTRIBUTOR_TEST_FIRST_UPLOAD_TOKEN":  duplicateSecret,
+				"DISTRIBUTOR_TEST_SECOND_UPLOAD_TOKEN": duplicateSecret,
+			},
+			want: "same value",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			for name, value := range tt.env {
+				t.Setenv(name, value)
+			}
+
+			err := Serve(context.Background(), ServeOptions{ConfigPath: tt.configPath(t)})
+			if err == nil {
+				t.Fatal("Serve() error = nil, want token startup error")
+			}
+			if !strings.Contains(err.Error(), tt.want) {
+				t.Fatalf("Serve() error = %v, want %q", err, tt.want)
+			}
+			if strings.Contains(err.Error(), duplicateSecret) {
+				t.Fatalf("Serve() error exposed token value: %v", err)
+			}
+		})
+	}
+}
+
+func writeServeUploadConfig(t *testing.T, tokenEnvs []string) string {
+	t.Helper()
+	body := `
+server:
+  http:
+    bind: 127.0.0.1:0
+pipelines:
+`
+	for index, tokenEnv := range tokenEnvs {
+		body += `
+  - id: reports-` + string(rune('a'+index)) + `
+    source:
+      backend: http_upload
+      token_env: ` + tokenEnv + `
+    destinations:
+      - id: archive
+        backend: local
+        path: ` + t.TempDir() + `
+`
+	}
+	return writeConfigFile(t, body)
+}

internal/app/source_select.go

@@ -0,0 +1,138 @@
+package app
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+type PipelineNotFoundError struct {
+	ID string
+}
+
+func (e PipelineNotFoundError) Error() string {
+	return fmt.Sprintf("pipeline %q not found", e.ID)
+}
+
+func IsPipelineNotFound(err error) bool {
+	var notFound PipelineNotFoundError
+	return errors.As(err, &notFound)
+}
+
+type sourceCommandOptions struct {
+	CommandName string
+	Path        string
+	ConfigPath  string
+	PipelineID  string
+	BundlePath  string
+}
+
+type sourceSelection struct {
+	Bundles       []bundle.Bundle
+	PipelineID    string
+	SourceBackend string
+	ConfigMode    bool
+	Warnings      []OutputWarning
+}
+
+func selectSourceBundles(ctx context.Context, options sourceCommandOptions, provider backendFactoryProvider) (sourceSelection, error) {
+	if err := ctx.Err(); err != nil {
+		return sourceSelection{}, err
+	}
+	if options.ConfigPath != "" {
+		setup, err := loadRuntimeSetup(options.ConfigPath)
+		if err != nil {
+			return sourceSelection{}, err
+		}
+		return selectSourceBundlesFromSetup(ctx, setup, options, provider)
+	}
+	if options.PipelineID != "" {
+		return sourceSelection{}, fmt.Errorf("configured source mode requires --config")
+	}
+	if options.BundlePath != "" {
+		return sourceSelection{}, fmt.Errorf("configured source mode requires --config")
+	}
+	if options.Path == "" {
+		return sourceSelection{}, fmt.Errorf("%s command requires a path", options.CommandName)
+	}
+	backend, err := newBackendFactory().openLocalPath(ctx, options.Path)
+	if err != nil {
+		return sourceSelection{}, err
+	}
+	defer closeBackend(backend)
+	bundles, err := bundle.Discover(ctx, backend, "")
+	if err != nil {
+		return sourceSelection{}, err
+	}
+	return sourceSelection{Bundles: bundles}, nil
+}
+
+func selectSourceBundlesFromConfig(ctx context.Context, cfg config.Config, options sourceCommandOptions, provider backendFactoryProvider) (sourceSelection, error) {
+	setup, err := runtimeSetupFromConfig("", cfg)
+	if err != nil {
+		return sourceSelection{}, err
+	}
+	return selectSourceBundlesFromSetup(ctx, setup, options, provider)
+}
+
+func selectSourceBundlesFromSetup(ctx context.Context, setup runtimeSetup, options sourceCommandOptions, provider backendFactoryProvider) (sourceSelection, error) {
+	if options.Path != "" {
+		return sourceSelection{}, fmt.Errorf("configured source mode does not accept a local path")
+	}
+	if options.PipelineID == "" {
+		return sourceSelection{}, fmt.Errorf("configured source mode requires --pipeline")
+	}
+	pipeline, ok := findPipeline(setup.Config, options.PipelineID)
+	if !ok {
+		return sourceSelection{}, PipelineNotFoundError{ID: options.PipelineID}
+	}
+	backends := provider(setup.Environment)
+	sourceBackend, err := backends.openSource(ctx, pipeline.Source)
+	if err != nil {
+		return sourceSelection{}, fmt.Errorf("pipeline %s source backend %s: %w", pipeline.ID, pipeline.Source.Backend, err)
+	}
+	defer closeBackend(sourceBackend)
+
+	var bundles []bundle.Bundle
+	if options.BundlePath != "" {
+		sourceBundle, err := bundle.Validate(ctx, sourceBackend, options.BundlePath)
+		if err != nil {
+			return sourceSelection{}, fmt.Errorf("pipeline %s source backend %s bundle %s: %w", pipeline.ID, pipeline.Source.Backend, storage.DisplayPath(options.BundlePath), err)
+		}
+		bundles = []bundle.Bundle{sourceBundle}
+	} else {
+		bundles, err = bundle.Discover(ctx, sourceBackend, "")
+		if err != nil {
+			return sourceSelection{}, fmt.Errorf("pipeline %s source backend %s discover source bundles: %w", pipeline.ID, pipeline.Source.Backend, err)
+		}
+	}
+	return sourceSelection{
+		Bundles:       bundles,
+		PipelineID:    pipeline.ID,
+		SourceBackend: pipeline.Source.Backend,
+		ConfigMode:    true,
+		Warnings:      append(setup.Warnings, sourceSSHWarnings(pipeline)...),
+	}, nil
+}
+
+func findPipeline(cfg config.Config, id string) (config.Pipeline, bool) {
+	for _, pipeline := range cfg.Pipelines {
+		if pipeline.ID == id {
+			return pipeline, true
+		}
+	}
+	return config.Pipeline{}, false
+}
+
+func sourceSSHWarnings(pipeline config.Pipeline) []OutputWarning {
+	if pipeline.Source.Backend != config.BackendSSH || pipeline.Source.SSH.HostKeyPolicy != config.HostKeyPolicyOff {
+		return nil
+	}
+	return []OutputWarning{{
+		Message: fmt.Sprintf("pipeline=%s source host_key_policy=off disables SSH host key checking", pipeline.ID),
+	}}
+}

internal/app/upload_coordinator.go

@@ -0,0 +1,399 @@
+package app
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"sync"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/ingest"
+)
+
+const DefaultUploadMaxFileCount = 4096
+
+type UploadRunID string
+
+type UploadStatus string
+
+const (
+	UploadStatusAccepted  UploadStatus = "accepted"
+	UploadStatusQueued    UploadStatus = "queued"
+	UploadStatusRunning   UploadStatus = "running"
+	UploadStatusSucceeded UploadStatus = "succeeded"
+	UploadStatusFailed    UploadStatus = "failed"
+	UploadStatusExpired   UploadStatus = "expired"
+)
+
+type UploadRunRecord struct {
+	ID         UploadRunID  `json:"run_id"`
+	PipelineID string       `json:"pipeline_id"`
+	Status     UploadStatus `json:"status"`
+	AcceptedAt time.Time    `json:"accepted_at"`
+	StartedAt  *time.Time   `json:"started_at,omitempty"`
+	FinishedAt *time.Time   `json:"finished_at,omitempty"`
+	Report     *RunReport   `json:"report,omitempty"`
+	Error      string       `json:"error,omitempty"`
+	StagedRoot string       `json:"-"`
+}
+
+type UploadRequest struct {
+	PipelineID   string
+	ContentType  string
+	Body         io.Reader
+	DryRun       bool
+	Force        bool
+	MaxFileCount int
+}
+
+type UploadQueueFullError struct {
+	QueueSize int
+}
+
+func (err UploadQueueFullError) Error() string {
+	return fmt.Sprintf("upload queue is full with capacity %d", err.QueueSize)
+}
+
+func IsUploadQueueFull(err error) bool {
+	var full UploadQueueFullError
+	return errors.As(err, &full)
+}
+
+type UploadCoordinator struct {
+	ctx          context.Context
+	cfg          config.Config
+	stage        uploadStageFunc
+	run          uploadRunFunc
+	now          func() time.Time
+	randomSuffix func() (string, error)
+	retention    time.Duration
+
+	mu             sync.Mutex
+	signal         chan struct{}
+	queueSize      int
+	maxConcurrency int
+	runningCount   int
+	reservedCount  int
+	activePipeline map[string]bool
+	pending        []*uploadJob
+	records        map[UploadRunID]UploadRunRecord
+}
+
+type uploadStageFunc func(context.Context, ingest.StageOptions) (ingest.StagedBundle, error)
+
+type uploadRunFunc func(context.Context, config.Config, RunPipelineWithLocalSourceOptions) (RunReport, error)
+
+type uploadJob struct {
+	recordID   UploadRunID
+	request    UploadRequest
+	pipeline   config.Pipeline
+	stagedRoot string
+}
+
+type uploadCoordinatorHooks struct {
+	stage        uploadStageFunc
+	run          uploadRunFunc
+	now          func() time.Time
+	randomSuffix func() (string, error)
+}
+
+func NewUploadCoordinator(ctx context.Context, cfg config.Config) *UploadCoordinator {
+	return newUploadCoordinator(ctx, cfg, uploadCoordinatorHooks{})
+}
+
+func newUploadCoordinator(ctx context.Context, cfg config.Config, hooks uploadCoordinatorHooks) *UploadCoordinator {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	config.ApplyDefaults(&cfg)
+	stage := hooks.stage
+	if stage == nil {
+		stage = ingest.StageArchive
+	}
+	run := hooks.run
+	if run == nil {
+		run = runPipelineConfigWithLocalSource
+	}
+	now := hooks.now
+	if now == nil {
+		now = time.Now
+	}
+	randomSuffix := hooks.randomSuffix
+	if randomSuffix == nil {
+		randomSuffix = randomRunIDSuffix
+	}
+	coordinator := &UploadCoordinator{
+		ctx:            ctx,
+		cfg:            cfg,
+		stage:          stage,
+		run:            run,
+		now:            now,
+		randomSuffix:   randomSuffix,
+		retention:      cfg.Server.HTTP.Retention.AsDuration(),
+		signal:         make(chan struct{}, 1),
+		queueSize:      cfg.Server.HTTP.QueueSize,
+		maxConcurrency: cfg.Server.HTTP.MaxConcurrency,
+		activePipeline: map[string]bool{},
+		records:        map[UploadRunID]UploadRunRecord{},
+	}
+	go coordinator.dispatchLoop()
+	return coordinator
+}
+
+func (coordinator *UploadCoordinator) Submit(ctx context.Context, request UploadRequest) (UploadRunRecord, error) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	if err := ctx.Err(); err != nil {
+		return UploadRunRecord{}, err
+	}
+	if request.Body == nil {
+		return UploadRunRecord{}, fmt.Errorf("upload body is required")
+	}
+	pipeline, ok := findPipeline(coordinator.cfg, request.PipelineID)
+	if !ok {
+		return UploadRunRecord{}, PipelineNotFoundError{ID: request.PipelineID}
+	}
+	if pipeline.Source.Backend != config.BackendHTTPUpload {
+		return UploadRunRecord{}, fmt.Errorf("pipeline %s source backend %s is not configured for uploads", pipeline.ID, pipeline.Source.Backend)
+	}
+	runID, err := coordinator.newRunID(pipeline.ID)
+	if err != nil {
+		return UploadRunRecord{}, err
+	}
+	if err := ingest.ValidateContentType(request.ContentType); err != nil {
+		return UploadRunRecord{}, err
+	}
+
+	coordinator.mu.Lock()
+	coordinator.expireLocked(coordinator.now().UTC())
+	if coordinator.queueFullLocked() {
+		coordinator.mu.Unlock()
+		return UploadRunRecord{}, UploadQueueFullError{QueueSize: coordinator.queueSize}
+	}
+	coordinator.reservedCount++
+	coordinator.mu.Unlock()
+
+	staged, err := coordinator.stage(ctx, ingest.StageOptions{
+		Body:                request.Body,
+		ContentType:         request.ContentType,
+		PipelineStagingPath: pipeline.Source.Upload.StagingPath,
+		RunID:               string(runID),
+		MaxUploadSize:       int64(*pipeline.Source.Upload.MaxUploadSize),
+		MaxExtractedSize:    int64(*pipeline.Source.Upload.MaxUploadSize),
+		MaxFileCount:        uploadMaxFileCount(request.MaxFileCount),
+	})
+	if err != nil {
+		coordinator.releaseReservation()
+		return UploadRunRecord{}, err
+	}
+
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	coordinator.reservedCount--
+	record := UploadRunRecord{
+		ID:         runID,
+		PipelineID: pipeline.ID,
+		Status:     UploadStatusAccepted,
+		AcceptedAt: coordinator.now().UTC(),
+		StagedRoot: staged.Root,
+	}
+	coordinator.records[runID] = record
+	coordinator.pending = append(coordinator.pending, &uploadJob{
+		recordID:   runID,
+		request:    request,
+		pipeline:   pipeline,
+		stagedRoot: staged.Root,
+	})
+	coordinator.notify()
+	return record, nil
+}
+
+func (coordinator *UploadCoordinator) Status(runID UploadRunID) (UploadRunRecord, bool) {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	coordinator.expireLocked(coordinator.now().UTC())
+	record, ok := coordinator.records[runID]
+	return record, ok
+}
+
+func (coordinator *UploadCoordinator) Expire() []UploadRunRecord {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	return coordinator.expireLocked(coordinator.now().UTC())
+}
+
+func (coordinator *UploadCoordinator) CanAccept() bool {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	coordinator.expireLocked(coordinator.now().UTC())
+	return !coordinator.queueFullLocked()
+}
+
+func (coordinator *UploadCoordinator) QueueDepth() int {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	return len(coordinator.pending) + coordinator.reservedCount
+}
+
+func (coordinator *UploadCoordinator) RunningCount() int {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	return coordinator.runningCount
+}
+
+func (coordinator *UploadCoordinator) newRunID(pipelineID string) (UploadRunID, error) {
+	suffix, err := coordinator.randomSuffix()
+	if err != nil {
+		return "", err
+	}
+	timestamp := coordinator.now().UTC().Format("20060102T150405Z")
+	return UploadRunID(pipelineID + "." + timestamp + "." + suffix), nil
+}
+
+func (coordinator *UploadCoordinator) dispatchLoop() {
+	for {
+		select {
+		case <-coordinator.ctx.Done():
+			return
+		case <-coordinator.signal:
+			for coordinator.startNext() {
+			}
+		}
+	}
+}
+
+func (coordinator *UploadCoordinator) startNext() bool {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	if coordinator.runningCount >= coordinator.maxConcurrency {
+		coordinator.markPendingQueuedLocked()
+		return false
+	}
+	index := -1
+	for candidateIndex, job := range coordinator.pending {
+		if coordinator.activePipeline[job.pipeline.ID] {
+			record := coordinator.records[job.recordID]
+			if record.Status == UploadStatusAccepted {
+				record.Status = UploadStatusQueued
+				coordinator.records[job.recordID] = record
+			}
+			continue
+		}
+		index = candidateIndex
+		break
+	}
+	if index < 0 {
+		return false
+	}
+
+	job := coordinator.pending[index]
+	coordinator.pending = append(coordinator.pending[:index], coordinator.pending[index+1:]...)
+	now := coordinator.now().UTC()
+	record := coordinator.records[job.recordID]
+	record.Status = UploadStatusRunning
+	record.StartedAt = &now
+	coordinator.records[job.recordID] = record
+	coordinator.runningCount++
+	coordinator.activePipeline[job.pipeline.ID] = true
+
+	go coordinator.runJob(job)
+	return true
+}
+
+func (coordinator *UploadCoordinator) markPendingQueuedLocked() {
+	for _, job := range coordinator.pending {
+		record := coordinator.records[job.recordID]
+		if record.Status == UploadStatusAccepted {
+			record.Status = UploadStatusQueued
+			coordinator.records[job.recordID] = record
+		}
+	}
+}
+
+func (coordinator *UploadCoordinator) runJob(job *uploadJob) {
+	report, err := coordinator.run(coordinator.ctx, coordinator.cfg, RunPipelineWithLocalSourceOptions{
+		PipelineID: job.pipeline.ID,
+		SourceRoot: job.stagedRoot,
+		DryRun:     job.request.DryRun,
+		Force:      job.request.Force,
+	})
+	coordinator.complete(job, &report, err)
+}
+
+func (coordinator *UploadCoordinator) releaseReservation() {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	coordinator.reservedCount--
+}
+
+func (coordinator *UploadCoordinator) queueFullLocked() bool {
+	return len(coordinator.pending)+coordinator.reservedCount >= coordinator.queueSize
+}
+
+func uploadMaxFileCount(value int) int {
+	if value > 0 {
+		return value
+	}
+	return DefaultUploadMaxFileCount
+}
+
+func (coordinator *UploadCoordinator) complete(job *uploadJob, report *RunReport, runErr error) {
+	coordinator.mu.Lock()
+	defer coordinator.mu.Unlock()
+	record := coordinator.records[job.recordID]
+	finishedAt := coordinator.now().UTC()
+	record.FinishedAt = &finishedAt
+	record.Report = report
+	if runErr != nil {
+		record.Status = UploadStatusFailed
+		record.Error = runErr.Error()
+	} else {
+		record.Status = UploadStatusSucceeded
+	}
+	coordinator.records[job.recordID] = record
+	coordinator.runningCount--
+	delete(coordinator.activePipeline, job.pipeline.ID)
+	coordinator.notify()
+}
+
+func (coordinator *UploadCoordinator) expireLocked(now time.Time) []UploadRunRecord {
+	var expired []UploadRunRecord
+	for runID, record := range coordinator.records {
+		if record.FinishedAt == nil || record.Status == UploadStatusExpired {
+			continue
+		}
+		if now.Before(record.FinishedAt.Add(coordinator.retention)) {
+			continue
+		}
+		if record.StagedRoot != "" {
+			_ = os.RemoveAll(record.StagedRoot)
+		}
+		record.Status = UploadStatusExpired
+		record.Report = nil
+		record.Error = ""
+		expired = append(expired, record)
+		delete(coordinator.records, runID)
+	}
+	return expired
+}
+
+func (coordinator *UploadCoordinator) notify() {
+	select {
+	case coordinator.signal <- struct{}{}:
+	default:
+	}
+}
+
+func randomRunIDSuffix() (string, error) {
+	var data [4]byte
+	if _, err := rand.Read(data[:]); err != nil {
+		return "", fmt.Errorf("generate run id suffix: %w", err)
+	}
+	return hex.EncodeToString(data[:]), nil
+}

internal/app/upload_coordinator_test.go

@@ -0,0 +1,373 @@
+package app
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/ingest"
+)
+
+func TestUploadCoordinatorGeneratesRunIDAndAcceptedStatus(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	clock := newUploadTestClock(time.Date(2026, 6, 3, 12, 0, 0, 0, time.UTC))
+	coordinator := newUploadCoordinator(ctx, uploadCoordinatorConfig(t, uploadCoordinatorConfigOptions{
+		pipelineIDs: []string{"weather-daily"},
+	}), uploadCoordinatorHooks{
+		now:          clock.Now,
+		randomSuffix: uploadTestSuffixes("ab12cd34"),
+		stage:        successfulUploadStage,
+		run:          successfulUploadRun,
+	})
+
+	record, err := coordinator.Submit(context.Background(), UploadRequest{
+		PipelineID:  "weather-daily",
+		ContentType: ingest.ContentTypeTar,
+		Body:        strings.NewReader("archive"),
+	})
+	if err != nil {
+		t.Fatalf("Submit() error = %v", err)
+	}
+	if got, want := record.ID, UploadRunID("weather-daily.20260603T120000Z.ab12cd34"); got != want {
+		t.Fatalf("run id = %q, want %q", got, want)
+	}
+	if got, want := record.Status, UploadStatusAccepted; got != want {
+		t.Fatalf("initial status = %q, want %q", got, want)
+	}
+	waitForUploadStatus(t, coordinator, record.ID, UploadStatusSucceeded)
+}
+
+func TestUploadCoordinatorRejectsFullQueueBeforeReadingBody(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	release := make(chan struct{})
+	var reads atomic.Int64
+	coordinator := newUploadCoordinator(ctx, uploadCoordinatorConfig(t, uploadCoordinatorConfigOptions{
+		pipelineIDs:    []string{"reports"},
+		queueSize:      1,
+		maxConcurrency: 1,
+	}), uploadCoordinatorHooks{
+		randomSuffix: uploadTestSuffixes("00000001", "00000002", "00000003"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			<-release
+			return RunReport{}, nil
+		},
+	})
+
+	first, err := coordinator.Submit(context.Background(), UploadRequest{
+		PipelineID:  "reports",
+		ContentType: ingest.ContentTypeTar,
+		Body:        strings.NewReader("first"),
+	})
+	if err != nil {
+		t.Fatalf("first Submit() error = %v", err)
+	}
+	waitForUploadStatus(t, coordinator, first.ID, UploadStatusRunning)
+
+	second, err := coordinator.Submit(context.Background(), UploadRequest{
+		PipelineID:  "reports",
+		ContentType: ingest.ContentTypeTar,
+		Body:        strings.NewReader("second"),
+	})
+	if err != nil {
+		t.Fatalf("second Submit() error = %v", err)
+	}
+	waitForUploadStatus(t, coordinator, second.ID, UploadStatusQueued)
+
+	_, err = coordinator.Submit(context.Background(), UploadRequest{
+		PipelineID:  "reports",
+		ContentType: ingest.ContentTypeTar,
+		Body: readerFunc(func(data []byte) (int, error) {
+			reads.Add(1)
+			return 0, io.EOF
+		}),
+	})
+	if err == nil || !IsUploadQueueFull(err) {
+		t.Fatalf("third Submit() error = %v, want full queue", err)
+	}
+	if got := reads.Load(); got != 0 {
+		t.Fatalf("rejected body reads = %d, want 0", got)
+	}
+	close(release)
+	waitForUploadStatus(t, coordinator, first.ID, UploadStatusSucceeded)
+	waitForUploadStatus(t, coordinator, second.ID, UploadStatusSucceeded)
+}
+
+func TestUploadCoordinatorSerializesSamePipelineUploads(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	release := make(chan struct{})
+	coordinator := newUploadCoordinator(ctx, uploadCoordinatorConfig(t, uploadCoordinatorConfigOptions{
+		pipelineIDs:    []string{"reports"},
+		queueSize:      4,
+		maxConcurrency: 2,
+	}), uploadCoordinatorHooks{
+		randomSuffix: uploadTestSuffixes("00000001", "00000002"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			<-release
+			return RunReport{}, nil
+		},
+	})
+
+	first, err := coordinator.Submit(context.Background(), UploadRequest{PipelineID: "reports", ContentType: ingest.ContentTypeTar, Body: strings.NewReader("first")})
+	if err != nil {
+		t.Fatalf("first Submit() error = %v", err)
+	}
+	second, err := coordinator.Submit(context.Background(), UploadRequest{PipelineID: "reports", ContentType: ingest.ContentTypeTar, Body: strings.NewReader("second")})
+	if err != nil {
+		t.Fatalf("second Submit() error = %v", err)
+	}
+	waitForUploadStatus(t, coordinator, first.ID, UploadStatusRunning)
+	waitForUploadStatus(t, coordinator, second.ID, UploadStatusQueued)
+	if got := coordinator.RunningCount(); got != 1 {
+		t.Fatalf("running count = %d, want 1", got)
+	}
+	close(release)
+	waitForUploadStatus(t, coordinator, first.ID, UploadStatusSucceeded)
+	waitForUploadStatus(t, coordinator, second.ID, UploadStatusSucceeded)
+}
+
+func TestUploadCoordinatorRunsDifferentPipelinesConcurrentlyUpToLimit(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	release := make(chan struct{})
+	coordinator := newUploadCoordinator(ctx, uploadCoordinatorConfig(t, uploadCoordinatorConfigOptions{
+		pipelineIDs:    []string{"reports-one", "reports-two"},
+		queueSize:      4,
+		maxConcurrency: 2,
+	}), uploadCoordinatorHooks{
+		randomSuffix: uploadTestSuffixes("00000001", "00000002"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			<-release
+			return RunReport{}, nil
+		},
+	})
+
+	first, err := coordinator.Submit(context.Background(), UploadRequest{PipelineID: "reports-one", ContentType: ingest.ContentTypeTar, Body: strings.NewReader("first")})
+	if err != nil {
+		t.Fatalf("first Submit() error = %v", err)
+	}
+	second, err := coordinator.Submit(context.Background(), UploadRequest{PipelineID: "reports-two", ContentType: ingest.ContentTypeTar, Body: strings.NewReader("second")})
+	if err != nil {
+		t.Fatalf("second Submit() error = %v", err)
+	}
+	waitForUploadStatus(t, coordinator, first.ID, UploadStatusRunning)
+	waitForUploadStatus(t, coordinator, second.ID, UploadStatusRunning)
+	if got := coordinator.RunningCount(); got != 2 {
+		t.Fatalf("running count = %d, want 2", got)
+	}
+	close(release)
+	waitForUploadStatus(t, coordinator, first.ID, UploadStatusSucceeded)
+	waitForUploadStatus(t, coordinator, second.ID, UploadStatusSucceeded)
+}
+
+func TestUploadCoordinatorRecordsFailureDetails(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	runErr := errors.New("publish failed")
+	coordinator := newUploadCoordinator(ctx, uploadCoordinatorConfig(t, uploadCoordinatorConfigOptions{
+		pipelineIDs: []string{"reports"},
+	}), uploadCoordinatorHooks{
+		randomSuffix: uploadTestSuffixes("00000001"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			return RunReport{DryRun: options.DryRun}, runErr
+		},
+	})
+
+	record, err := coordinator.Submit(context.Background(), UploadRequest{
+		PipelineID:  "reports",
+		ContentType: ingest.ContentTypeTar,
+		Body:        strings.NewReader("archive"),
+		DryRun:      true,
+	})
+	if err != nil {
+		t.Fatalf("Submit() error = %v", err)
+	}
+	failed := waitForUploadStatus(t, coordinator, record.ID, UploadStatusFailed)
+	if failed.Error != runErr.Error() {
+		t.Fatalf("error = %q, want %q", failed.Error, runErr.Error())
+	}
+	if failed.Report == nil || !failed.Report.DryRun {
+		t.Fatalf("report = %#v, want retained dry-run report", failed.Report)
+	}
+}
+
+func TestUploadCoordinatorExpiresCompletedRecordsAndStagingDirectories(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	clock := newUploadTestClock(time.Date(2026, 6, 3, 12, 0, 0, 0, time.UTC))
+	coordinator := newUploadCoordinator(ctx, uploadCoordinatorConfig(t, uploadCoordinatorConfigOptions{
+		pipelineIDs: []string{"reports"},
+		retention:   time.Second,
+	}), uploadCoordinatorHooks{
+		now:          clock.Now,
+		randomSuffix: uploadTestSuffixes("00000001"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			return RunReport{DryRun: true}, nil
+		},
+	})
+
+	record, err := coordinator.Submit(context.Background(), UploadRequest{
+		PipelineID:  "reports",
+		ContentType: ingest.ContentTypeTar,
+		Body:        strings.NewReader("archive"),
+	})
+	if err != nil {
+		t.Fatalf("Submit() error = %v", err)
+	}
+	succeeded := waitForUploadStatus(t, coordinator, record.ID, UploadStatusSucceeded)
+	if succeeded.Report == nil || !succeeded.Report.DryRun {
+		t.Fatalf("report = %#v, want retained dry-run report", succeeded.Report)
+	}
+	if _, err := os.Stat(succeeded.StagedRoot); err != nil {
+		t.Fatalf("staged root stat before expiry = %v", err)
+	}
+
+	clock.Advance(2 * time.Second)
+	expired := coordinator.Expire()
+	if got, want := len(expired), 1; got != want {
+		t.Fatalf("expired count = %d, want %d", got, want)
+	}
+	if expired[0].Status != UploadStatusExpired || expired[0].Report != nil || expired[0].Error != "" {
+		t.Fatalf("expired record = %#v, want expired without report/error", expired[0])
+	}
+	if _, ok := coordinator.Status(record.ID); ok {
+		t.Fatal("Status() ok = true after expiry, want removed status")
+	}
+	if _, err := os.Stat(succeeded.StagedRoot); !os.IsNotExist(err) {
+		t.Fatalf("staged root stat after expiry = %v, want not exist", err)
+	}
+}
+
+type readerFunc func([]byte) (int, error)
+
+func (fn readerFunc) Read(data []byte) (int, error) {
+	return fn(data)
+}
+
+func successfulUploadStage(ctx context.Context, opts ingest.StageOptions) (ingest.StagedBundle, error) {
+	root := filepath.Join(opts.PipelineStagingPath, opts.RunID)
+	if err := os.MkdirAll(root, 0o755); err != nil {
+		return ingest.StagedBundle{}, err
+	}
+	return ingest.StagedBundle{Root: root}, nil
+}
+
+func successfulUploadRun(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+	return RunReport{}, nil
+}
+
+type uploadCoordinatorConfigOptions struct {
+	pipelineIDs    []string
+	queueSize      int
+	maxConcurrency int
+	retention      time.Duration
+}
+
+func uploadCoordinatorConfig(t *testing.T, opts uploadCoordinatorConfigOptions) config.Config {
+	t.Helper()
+	queueSize := opts.queueSize
+	if queueSize == 0 {
+		queueSize = 4
+	}
+	maxConcurrency := opts.maxConcurrency
+	if maxConcurrency == 0 {
+		maxConcurrency = 1
+	}
+	retentionValue := opts.retention
+	if retentionValue == 0 {
+		retentionValue = time.Minute
+	}
+	retention := config.Duration(retentionValue)
+	maxUploadSize := config.ByteSize(1024)
+	cfg := config.Config{
+		Server: config.Server{HTTP: config.HTTPServer{
+			StagingRoot:    t.TempDir(),
+			MaxUploadSize:  &maxUploadSize,
+			QueueSize:      queueSize,
+			MaxConcurrency: maxConcurrency,
+			Retention:      &retention,
+		}},
+	}
+	for _, pipelineID := range opts.pipelineIDs {
+		cfg.Pipelines = append(cfg.Pipelines, config.Pipeline{
+			ID: pipelineID,
+			Source: config.Backend{
+				Backend: config.BackendHTTPUpload,
+				Upload:  config.HTTPUpload{TokenEnv: strings.ToUpper(strings.ReplaceAll(pipelineID, "-", "_")) + "_TOKEN"},
+			},
+			Destinations: []config.Destination{{
+				ID:      "archive",
+				Backend: config.BackendLocal,
+				Path:    t.TempDir(),
+			}},
+		})
+	}
+	return cfg
+}
+
+type uploadTestClock struct {
+	mu  sync.Mutex
+	now time.Time
+}
+
+func newUploadTestClock(now time.Time) *uploadTestClock {
+	return &uploadTestClock{now: now}
+}
+
+func (clock *uploadTestClock) Now() time.Time {
+	clock.mu.Lock()
+	defer clock.mu.Unlock()
+	return clock.now
+}
+
+func (clock *uploadTestClock) Advance(duration time.Duration) {
+	clock.mu.Lock()
+	defer clock.mu.Unlock()
+	clock.now = clock.now.Add(duration)
+}
+
+func uploadTestSuffixes(values ...string) func() (string, error) {
+	var mu sync.Mutex
+	index := 0
+	return func() (string, error) {
+		mu.Lock()
+		defer mu.Unlock()
+		if index >= len(values) {
+			return fmt.Sprintf("%08d", index+1), nil
+		}
+		value := values[index]
+		index++
+		return value, nil
+	}
+}
+
+func waitForUploadStatus(t *testing.T, coordinator *UploadCoordinator, runID UploadRunID, status UploadStatus) UploadRunRecord {
+	t.Helper()
+	deadline := time.Now().Add(time.Second)
+	for time.Now().Before(deadline) {
+		record, ok := coordinator.Status(runID)
+		if ok && record.Status == status {
+			return record
+		}
+		time.Sleep(time.Millisecond)
+	}
+	record, ok := coordinator.Status(runID)
+	t.Fatalf("timed out waiting for status %s; latest ok=%t record=%#v", status, ok, record)
+	return UploadRunRecord{}
+}

internal/app/upload_http.go

@@ -0,0 +1,168 @@
+package app
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/ingest"
+)
+
+type uploadCoordinator interface {
+	CanAccept() bool
+	Submit(context.Context, UploadRequest) (UploadRunRecord, error)
+	Status(UploadRunID) (UploadRunRecord, bool)
+}
+
+type uploadHTTPHandler struct {
+	coordinator uploadCoordinator
+	tokens      map[string]string
+}
+
+type uploadAcceptedResponse struct {
+	RunID  UploadRunID  `json:"run_id"`
+	Status UploadStatus `json:"status"`
+}
+
+type httpErrorResponse struct {
+	Error string `json:"error"`
+}
+
+func newUploadHTTPHandler(ctx context.Context, cfg config.Config, environment config.Environment) (http.Handler, error) {
+	config.ApplyDefaults(&cfg)
+	tokens, err := resolveUploadTokens(cfg, environment)
+	if err != nil {
+		return nil, err
+	}
+	return uploadHTTPHandler{
+		coordinator: NewUploadCoordinator(ctx, cfg),
+		tokens:      tokens,
+	}, nil
+}
+
+func resolveUploadTokens(cfg config.Config, environment config.Environment) (map[string]string, error) {
+	tokens := make(map[string]string)
+	for _, pipeline := range cfg.Pipelines {
+		if pipeline.Source.Backend != config.BackendHTTPUpload {
+			continue
+		}
+		tokenName := pipeline.Source.Upload.TokenEnv
+		token, ok := environment.Lookup(tokenName)
+		if !ok {
+			return nil, fmt.Errorf("upload token environment variable %s is not set", tokenName)
+		}
+		if token == "" {
+			return nil, fmt.Errorf("upload token environment variable %s is empty", tokenName)
+		}
+		if existing, exists := tokens[token]; exists {
+			return nil, fmt.Errorf("upload token environment variables for pipelines %s and %s resolve to the same value", existing, pipeline.ID)
+		}
+		tokens[token] = pipeline.ID
+	}
+	return tokens, nil
+}
+
+func (handler uploadHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	switch {
+	case r.Method == http.MethodGet && r.URL.Path == "/healthz":
+		handler.handleHealth(w)
+	case r.Method == http.MethodPost && r.URL.Path == "/upload":
+		handler.handleUpload(w, r)
+	case r.Method == http.MethodGet && strings.HasPrefix(r.URL.Path, "/runs/"):
+		handler.handleRunStatus(w, r)
+	default:
+		writeHTTPError(w, http.StatusNotFound, "not found")
+	}
+}
+
+func (handler uploadHTTPHandler) handleHealth(w http.ResponseWriter) {
+	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}
+
+func (handler uploadHTTPHandler) handleUpload(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Query().Has("pipeline") || r.URL.Query().Has("pipeline_id") {
+		writeHTTPError(w, http.StatusBadRequest, "pipeline id is not accepted")
+		return
+	}
+	pipelineID, ok := handler.authenticate(r.Header.Get("Authorization"))
+	if !ok {
+		writeHTTPError(w, http.StatusUnauthorized, "unauthorized")
+		return
+	}
+	contentType := r.Header.Get("Content-Type")
+	if err := ingest.ValidateContentType(contentType); err != nil {
+		writeHTTPError(w, http.StatusUnsupportedMediaType, "unsupported content type")
+		return
+	}
+	if !handler.coordinator.CanAccept() {
+		writeHTTPError(w, http.StatusServiceUnavailable, "upload queue is full")
+		return
+	}
+	record, err := handler.coordinator.Submit(r.Context(), UploadRequest{
+		PipelineID:  pipelineID,
+		ContentType: contentType,
+		Body:        r.Body,
+	})
+	if err != nil {
+		writeUploadSubmitError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusAccepted, uploadAcceptedResponse{
+		RunID:  record.ID,
+		Status: UploadStatusAccepted,
+	})
+}
+
+func (handler uploadHTTPHandler) handleRunStatus(w http.ResponseWriter, r *http.Request) {
+	rawRunID := strings.TrimPrefix(r.URL.Path, "/runs/")
+	if rawRunID == "" || strings.Contains(rawRunID, "/") {
+		writeHTTPError(w, http.StatusNotFound, "not found")
+		return
+	}
+	record, ok := handler.coordinator.Status(UploadRunID(rawRunID))
+	if !ok {
+		writeHTTPError(w, http.StatusNotFound, "run not found")
+		return
+	}
+	writeJSON(w, http.StatusOK, record)
+}
+
+func (handler uploadHTTPHandler) authenticate(header string) (string, bool) {
+	const prefix = "Bearer "
+	if !strings.HasPrefix(header, prefix) {
+		return "", false
+	}
+	token := strings.TrimSpace(strings.TrimPrefix(header, prefix))
+	if token == "" {
+		return "", false
+	}
+	pipelineID, ok := handler.tokens[token]
+	return pipelineID, ok
+}
+
+func writeUploadSubmitError(w http.ResponseWriter, err error) {
+	switch {
+	case IsUploadQueueFull(err):
+		writeHTTPError(w, http.StatusServiceUnavailable, "upload queue is full")
+	case errors.Is(err, ingest.ErrUploadTooLarge):
+		writeHTTPError(w, http.StatusRequestEntityTooLarge, "upload exceeds maximum size")
+	case errors.Is(err, ingest.ErrUnsupportedContentType):
+		writeHTTPError(w, http.StatusUnsupportedMediaType, "unsupported content type")
+	default:
+		writeHTTPError(w, http.StatusBadRequest, "upload rejected")
+	}
+}
+
+func writeHTTPError(w http.ResponseWriter, status int, message string) {
+	writeJSON(w, status, httpErrorResponse{Error: message})
+}
+
+func writeJSON(w http.ResponseWriter, status int, value any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(value)
+}

internal/app/upload_http_integration_test.go

@@ -0,0 +1,458 @@
+package app
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/fs"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/ingest"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
+)
+
+func TestHTTPUploadPublishesTarAndGzipFanout(t *testing.T) {
+	tests := []struct {
+		name        string
+		compressed  bool
+		contentType string
+	}{
+		{name: "tar", contentType: ingest.ContentTypeTar},
+		{name: "gzip", compressed: true, contentType: ingest.ContentTypeGzip},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			firstDestination := t.TempDir()
+			secondDestination := t.TempDir()
+			cfg := httpUploadIntegrationConfig(t, []httpUploadPipelineSpec{{
+				id:           "reports",
+				tokenEnv:     "REPORTS_TOKEN",
+				stagingPath:  filepath.Join(t.TempDir(), "reports"),
+				destinations: []string{firstDestination, secondDestination},
+			}}, 4, 1)
+			handler, err := newUploadHTTPHandler(context.Background(), cfg, uploadHTTPTestEnvironment(map[string]string{
+				"REPORTS_TOKEN": "reports-secret",
+			}))
+			if err != nil {
+				t.Fatalf("newUploadHTTPHandler() error = %v", err)
+			}
+			server := httptest.NewServer(handler)
+			defer server.Close()
+
+			runID := submitHTTPUpload(t, server, "reports-secret", tt.contentType, bundleArchive(t, tt.compressed, testutil.BundleOptions{}))
+			record := waitForHTTPUploadStatus(t, server, runID, UploadStatusSucceeded)
+
+			if record.Report == nil {
+				t.Fatal("completed status report = nil, want run report")
+			}
+			if record.Report.Summary.Status != "ok" {
+				t.Fatalf("summary status = %q, want ok", record.Report.Summary.Status)
+			}
+			if got, want := len(record.Report.Actions), 2; got != want {
+				t.Fatalf("action count = %d, want %d", got, want)
+			}
+			assertPublishedBundle(t, firstDestination)
+			assertPublishedBundle(t, secondDestination)
+		})
+	}
+}
+
+func TestHTTPUploadInvalidArchiveIsRejectedWithoutRunID(t *testing.T) {
+	destination := t.TempDir()
+	coordinator := NewUploadCoordinator(context.Background(), httpUploadIntegrationConfig(t, []httpUploadPipelineSpec{{
+		id:           "reports",
+		tokenEnv:     "REPORTS_TOKEN",
+		stagingPath:  filepath.Join(t.TempDir(), "reports"),
+		destinations: []string{destination},
+	}}, 4, 1))
+	handler := uploadHTTPHandler{
+		coordinator: coordinator,
+		tokens:      map[string]string{"reports-secret": "reports"},
+	}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	status, body := postHTTPUpload(t, server, "reports-secret", ingest.ContentTypeTar, []byte("not a tar archive"))
+	if status != http.StatusBadRequest {
+		t.Fatalf("POST /upload status = %d, want %d; body = %s", status, http.StatusBadRequest, body)
+	}
+	if strings.Contains(body, "run_id") || strings.Contains(body, "reports-secret") {
+		t.Fatalf("invalid archive response exposed run id or token: %s", body)
+	}
+	if got := coordinator.QueueDepth(); got != 0 {
+		t.Fatalf("queue depth = %d, want 0", got)
+	}
+	assertDirectoryEmpty(t, destination)
+}
+
+func TestHTTPUploadOversizedArchiveIsRejectedWithoutRunID(t *testing.T) {
+	destination := t.TempDir()
+	stagingPath := filepath.Join(t.TempDir(), "reports")
+	cfg := httpUploadIntegrationConfig(t, []httpUploadPipelineSpec{{
+		id:           "reports",
+		tokenEnv:     "REPORTS_TOKEN",
+		stagingPath:  stagingPath,
+		destinations: []string{destination},
+	}}, 4, 1)
+	size := config.ByteSize(4)
+	cfg.Server.HTTP.MaxUploadSize = &size
+	cfg.Pipelines[0].Source.Upload.MaxUploadSize = &size
+	coordinator := NewUploadCoordinator(context.Background(), cfg)
+	handler := uploadHTTPHandler{
+		coordinator: coordinator,
+		tokens:      map[string]string{"reports-secret": "reports"},
+	}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	status, body := postHTTPUpload(t, server, "reports-secret", ingest.ContentTypeTar, bundleArchive(t, false, testutil.BundleOptions{}))
+	if status != http.StatusRequestEntityTooLarge {
+		t.Fatalf("POST /upload status = %d, want %d; body = %s", status, http.StatusRequestEntityTooLarge, body)
+	}
+	if strings.Contains(body, "run_id") || strings.Contains(body, "reports-secret") {
+		t.Fatalf("oversized response exposed run id or token: %s", body)
+	}
+	if got := coordinator.QueueDepth(); got != 0 {
+		t.Fatalf("queue depth = %d, want 0", got)
+	}
+	assertDirectoryEmpty(t, stagingPath)
+	assertDirectoryEmpty(t, destination)
+}
+
+func TestHTTPUploadSamePipelineRequestsSerialize(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	release := make(chan struct{})
+	started := make(chan struct{}, 1)
+	coordinator := newUploadCoordinator(ctx, httpUploadIntegrationConfig(t, []httpUploadPipelineSpec{{
+		id:           "reports",
+		tokenEnv:     "REPORTS_TOKEN",
+		stagingPath:  filepath.Join(t.TempDir(), "reports"),
+		destinations: []string{t.TempDir()},
+	}}, 4, 2), uploadCoordinatorHooks{
+		randomSuffix: uploadTestSuffixes("00000001", "00000002"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			select {
+			case started <- struct{}{}:
+			default:
+			}
+			<-release
+			return RunReport{}, nil
+		},
+	})
+	handler := uploadHTTPHandler{
+		coordinator: coordinator,
+		tokens:      map[string]string{"reports-secret": "reports"},
+	}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	firstRunID := submitHTTPUpload(t, server, "reports-secret", ingest.ContentTypeTar, []byte("first"))
+	waitForRunStart(t, started)
+	first := waitForHTTPUploadStatus(t, server, firstRunID, UploadStatusRunning)
+	secondRunID := submitHTTPUpload(t, server, "reports-secret", ingest.ContentTypeTar, []byte("second"))
+	second := waitForHTTPUploadStatus(t, server, secondRunID, UploadStatusQueued)
+
+	if first.PipelineID != "reports" || second.PipelineID != "reports" {
+		t.Fatalf("statuses = %#v %#v, want same pipeline", first, second)
+	}
+	if got := coordinator.RunningCount(); got != 1 {
+		t.Fatalf("running count = %d, want 1", got)
+	}
+	close(release)
+	waitForHTTPUploadStatus(t, server, firstRunID, UploadStatusSucceeded)
+	waitForHTTPUploadStatus(t, server, secondRunID, UploadStatusSucceeded)
+}
+
+func TestHTTPUploadDifferentPipelinesRunConcurrently(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	release := make(chan struct{})
+	started := make(chan string, 2)
+	coordinator := newUploadCoordinator(ctx, httpUploadIntegrationConfig(t, []httpUploadPipelineSpec{
+		{
+			id:           "reports-one",
+			tokenEnv:     "REPORTS_ONE_TOKEN",
+			stagingPath:  filepath.Join(t.TempDir(), "reports-one"),
+			destinations: []string{t.TempDir()},
+		},
+		{
+			id:           "reports-two",
+			tokenEnv:     "REPORTS_TWO_TOKEN",
+			stagingPath:  filepath.Join(t.TempDir(), "reports-two"),
+			destinations: []string{t.TempDir()},
+		},
+	}, 4, 2), uploadCoordinatorHooks{
+		randomSuffix: uploadTestSuffixes("00000001", "00000002"),
+		stage:        successfulUploadStage,
+		run: func(ctx context.Context, cfg config.Config, options RunPipelineWithLocalSourceOptions) (RunReport, error) {
+			started <- options.PipelineID
+			<-release
+			return RunReport{}, nil
+		},
+	})
+	handler := uploadHTTPHandler{
+		coordinator: coordinator,
+		tokens: map[string]string{
+			"one-secret": "reports-one",
+			"two-secret": "reports-two",
+		},
+	}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	firstRunID := submitHTTPUpload(t, server, "one-secret", ingest.ContentTypeTar, []byte("first"))
+	secondRunID := submitHTTPUpload(t, server, "two-secret", ingest.ContentTypeTar, []byte("second"))
+	waitForStartedPipelines(t, started, "reports-one", "reports-two")
+	waitForHTTPUploadStatus(t, server, firstRunID, UploadStatusRunning)
+	waitForHTTPUploadStatus(t, server, secondRunID, UploadStatusRunning)
+
+	if got := coordinator.RunningCount(); got != 2 {
+		t.Fatalf("running count = %d, want 2", got)
+	}
+	close(release)
+	waitForHTTPUploadStatus(t, server, firstRunID, UploadStatusSucceeded)
+	waitForHTTPUploadStatus(t, server, secondRunID, UploadStatusSucceeded)
+}
+
+type httpUploadPipelineSpec struct {
+	id           string
+	tokenEnv     string
+	stagingPath  string
+	destinations []string
+}
+
+func httpUploadIntegrationConfig(t *testing.T, pipelines []httpUploadPipelineSpec, queueSize, maxConcurrency int) config.Config {
+	t.Helper()
+	size := config.ByteSize(1024 * 1024)
+	retention := config.Duration(time.Minute)
+	cfg := config.Config{
+		Server: config.Server{HTTP: config.HTTPServer{
+			Bind:           config.DefaultHTTPBind,
+			StagingRoot:    t.TempDir(),
+			MaxUploadSize:  &size,
+			QueueSize:      queueSize,
+			MaxConcurrency: maxConcurrency,
+			Retention:      &retention,
+		}},
+	}
+	for _, spec := range pipelines {
+		pipeline := config.Pipeline{
+			ID: spec.id,
+			Source: config.Backend{
+				Backend: config.BackendHTTPUpload,
+				Upload: config.HTTPUpload{
+					TokenEnv:      spec.tokenEnv,
+					StagingPath:   spec.stagingPath,
+					MaxUploadSize: &size,
+				},
+			},
+		}
+		for index, destination := range spec.destinations {
+			pipeline.Destinations = append(pipeline.Destinations, config.Destination{
+				ID:      fmt.Sprintf("archive-%d", index+1),
+				Backend: config.BackendLocal,
+				Path:    destination,
+				Publish: &config.PublishPolicy{Source: true},
+			})
+		}
+		cfg.Pipelines = append(cfg.Pipelines, pipeline)
+	}
+	config.ApplyDefaults(&cfg)
+	return cfg
+}
+
+func submitHTTPUpload(t *testing.T, server *httptest.Server, token, contentType string, body []byte) UploadRunID {
+	t.Helper()
+	status, responseBody := postHTTPUpload(t, server, token, contentType, body)
+	if status != http.StatusAccepted {
+		t.Fatalf("POST /upload status = %d, want %d; body = %s", status, http.StatusAccepted, responseBody)
+	}
+	var accepted uploadAcceptedResponse
+	if err := json.Unmarshal([]byte(responseBody), &accepted); err != nil {
+		t.Fatalf("decode accepted response: %v", err)
+	}
+	if accepted.RunID == "" || accepted.Status != UploadStatusAccepted {
+		t.Fatalf("accepted response = %#v, want run id and accepted status", accepted)
+	}
+	return accepted.RunID
+}
+
+func postHTTPUpload(t *testing.T, server *httptest.Server, token, contentType string, body []byte) (int, string) {
+	t.Helper()
+	request, err := http.NewRequest(http.MethodPost, server.URL+"/upload", bytes.NewReader(body))
+	if err != nil {
+		t.Fatalf("NewRequest() error = %v", err)
+	}
+	request.Header.Set("Authorization", "Bearer "+token)
+	request.Header.Set("Content-Type", contentType)
+	response, err := server.Client().Do(request)
+	if err != nil {
+		t.Fatalf("POST /upload error = %v", err)
+	}
+	defer response.Body.Close()
+	data, err := io.ReadAll(response.Body)
+	if err != nil {
+		t.Fatalf("read response body: %v", err)
+	}
+	return response.StatusCode, string(data)
+}
+
+func waitForHTTPUploadStatus(t *testing.T, server *httptest.Server, runID UploadRunID, status UploadStatus) UploadRunRecord {
+	t.Helper()
+	deadline := time.Now().Add(3 * time.Second)
+	var latest UploadRunRecord
+	var latestStatus int
+	for time.Now().Before(deadline) {
+		latest, latestStatus = getHTTPUploadStatus(t, server, runID)
+		if latestStatus == http.StatusOK && latest.Status == status {
+			return latest
+		}
+		time.Sleep(time.Millisecond)
+	}
+	t.Fatalf("timed out waiting for status %s; latest HTTP status=%d record=%#v", status, latestStatus, latest)
+	return UploadRunRecord{}
+}
+
+func getHTTPUploadStatus(t *testing.T, server *httptest.Server, runID UploadRunID) (UploadRunRecord, int) {
+	t.Helper()
+	response, err := server.Client().Get(server.URL + "/runs/" + string(runID))
+	if err != nil {
+		t.Fatalf("GET /runs error = %v", err)
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return UploadRunRecord{}, response.StatusCode
+	}
+	var record UploadRunRecord
+	if err := json.NewDecoder(response.Body).Decode(&record); err != nil {
+		t.Fatalf("decode run status: %v", err)
+	}
+	return record, response.StatusCode
+}
+
+func bundleArchive(t *testing.T, compressed bool, opts testutil.BundleOptions) []byte {
+	t.Helper()
+	root := t.TempDir()
+	testutil.WriteSourceBundle(t, root, "", opts)
+	return tarDirectory(t, root, compressed)
+}
+
+func tarDirectory(t *testing.T, root string, compressed bool) []byte {
+	t.Helper()
+	var output bytes.Buffer
+	var writer io.WriteCloser = nopWriteCloser{writer: &output}
+	if compressed {
+		gzipWriter := gzip.NewWriter(&output)
+		writer = gzipWriter
+	}
+	tarWriter := tar.NewWriter(writer)
+	if err := filepath.WalkDir(root, func(filePath string, entry fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if entry.IsDir() {
+			return nil
+		}
+		relative, err := filepath.Rel(root, filePath)
+		if err != nil {
+			return err
+		}
+		data, err := os.ReadFile(filePath)
+		if err != nil {
+			return err
+		}
+		header := &tar.Header{
+			Name: filepath.ToSlash(relative),
+			Mode: 0o600,
+			Size: int64(len(data)),
+		}
+		if err := tarWriter.WriteHeader(header); err != nil {
+			return err
+		}
+		if _, err := tarWriter.Write(data); err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		t.Fatalf("walk bundle: %v", err)
+	}
+	if err := tarWriter.Close(); err != nil {
+		t.Fatalf("close tar: %v", err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatalf("close archive: %v", err)
+	}
+	return output.Bytes()
+}
+
+type nopWriteCloser struct {
+	writer io.Writer
+}
+
+func (writer nopWriteCloser) Write(data []byte) (int, error) {
+	return writer.writer.Write(data)
+}
+
+func (writer nopWriteCloser) Close() error {
+	return nil
+}
+
+func assertPublishedBundle(t *testing.T, destinationRoot string) {
+	t.Helper()
+	testutil.AssertFile(t, filepath.Join(destinationRoot, "report.md"), "# Report\nSunny.\n")
+	testutil.AssertFile(t, filepath.Join(destinationRoot, "summary.txt"), "Summary\n")
+	if _, err := os.Stat(filepath.Join(destinationRoot, storage.StateFileName)); err != nil {
+		t.Fatalf("destination state stat: %v", err)
+	}
+}
+
+func assertDirectoryEmpty(t *testing.T, root string) {
+	t.Helper()
+	entries, err := os.ReadDir(root)
+	if err != nil {
+		t.Fatalf("ReadDir() error = %v", err)
+	}
+	if len(entries) != 0 {
+		t.Fatalf("directory %s has %d entries, want empty", root, len(entries))
+	}
+}
+
+func waitForRunStart(t *testing.T, started <-chan struct{}) {
+	t.Helper()
+	select {
+	case <-started:
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for run start")
+	}
+}
+
+func waitForStartedPipelines(t *testing.T, started <-chan string, want ...string) {
+	t.Helper()
+	remaining := map[string]bool{}
+	for _, pipelineID := range want {
+		remaining[pipelineID] = true
+	}
+	deadline := time.After(time.Second)
+	for len(remaining) > 0 {
+		select {
+		case pipelineID := <-started:
+			delete(remaining, pipelineID)
+		case <-deadline:
+			t.Fatalf("timed out waiting for pipelines to start; remaining=%v", remaining)
+		}
+	}
+}

internal/app/upload_http_test.go

@@ -0,0 +1,355 @@
+package app
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/ingest"
+)
+
+type fakeUploadCoordinator struct {
+	canAccept bool
+	submit    func(context.Context, UploadRequest) (UploadRunRecord, error)
+	status    func(UploadRunID) (UploadRunRecord, bool)
+}
+
+func (fake fakeUploadCoordinator) CanAccept() bool {
+	return fake.canAccept
+}
+
+func (fake fakeUploadCoordinator) Submit(ctx context.Context, request UploadRequest) (UploadRunRecord, error) {
+	if fake.submit == nil {
+		return UploadRunRecord{}, errors.New("unexpected submit")
+	}
+	return fake.submit(ctx, request)
+}
+
+func (fake fakeUploadCoordinator) Status(runID UploadRunID) (UploadRunRecord, bool) {
+	if fake.status == nil {
+		return UploadRunRecord{}, false
+	}
+	return fake.status(runID)
+}
+
+func TestResolveUploadTokensFailsForMissingAndDuplicateTokens(t *testing.T) {
+	cfg := uploadHTTPTestConfig()
+
+	_, err := resolveUploadTokens(cfg, config.NewEnvironment(nil, func(string) (string, bool) {
+		return "", false
+	}))
+	if err == nil || !strings.Contains(err.Error(), "UPLOAD_TOKEN") {
+		t.Fatalf("resolveUploadTokens() error = %v, want missing UPLOAD_TOKEN", err)
+	}
+
+	cfg.Pipelines = append(cfg.Pipelines, config.Pipeline{
+		ID: "weekly",
+		Source: config.Backend{
+			Backend: config.BackendHTTPUpload,
+			Upload:  config.HTTPUpload{TokenEnv: "OTHER_UPLOAD_TOKEN"},
+		},
+		Destinations: cfg.Pipelines[0].Destinations,
+	})
+	config.ApplyDefaults(&cfg)
+	secret := "super-secret-token"
+	_, err = resolveUploadTokens(cfg, uploadHTTPTestEnvironment(map[string]string{
+		"UPLOAD_TOKEN":       secret,
+		"OTHER_UPLOAD_TOKEN": secret,
+	}))
+	if err == nil {
+		t.Fatal("resolveUploadTokens() error = nil, want duplicate token error")
+	}
+	if strings.Contains(err.Error(), secret) {
+		t.Fatalf("duplicate token error exposed secret value: %q", err)
+	}
+}
+
+func TestNewUploadHTTPHandlerAcceptsDefaultedConfig(t *testing.T) {
+	cfg := uploadHTTPTestConfig()
+	cfg.Server.HTTP.Bind = ""
+	cfg.Server.HTTP.StagingRoot = ""
+	cfg.Server.HTTP.MaxUploadSize = nil
+	cfg.Server.HTTP.QueueSize = 0
+	cfg.Server.HTTP.MaxConcurrency = 0
+	cfg.Server.HTTP.Retention = nil
+	cfg.Pipelines[0].Source.Upload.StagingPath = ""
+	cfg.Pipelines[0].Source.Upload.MaxUploadSize = nil
+
+	handler, err := newUploadHTTPHandler(context.Background(), cfg, uploadHTTPTestEnvironment(map[string]string{
+		"UPLOAD_TOKEN": "secret",
+	}))
+	if err != nil {
+		t.Fatalf("newUploadHTTPHandler() error = %v", err)
+	}
+	if handler == nil {
+		t.Fatal("newUploadHTTPHandler() = nil")
+	}
+}
+
+func TestUploadHTTPHandlerAuthenticatesAndAcceptsUpload(t *testing.T) {
+	var submitted UploadRequest
+	handler := uploadHTTPHandler{
+		coordinator: fakeUploadCoordinator{
+			canAccept: true,
+			submit: func(_ context.Context, request UploadRequest) (UploadRunRecord, error) {
+				submitted = request
+				body, err := io.ReadAll(request.Body)
+				if err != nil {
+					t.Fatalf("read submitted body: %v", err)
+				}
+				if string(body) != "archive" {
+					t.Fatalf("submitted body = %q, want archive", body)
+				}
+				return UploadRunRecord{ID: "reports.20260603T120000Z.abcdef12", Status: UploadStatusAccepted}, nil
+			},
+		},
+		tokens: map[string]string{"valid-token": "reports"},
+	}
+	recorder := httptest.NewRecorder()
+	request := httptest.NewRequest(http.MethodPost, "/upload", strings.NewReader("archive"))
+	request.Header.Set("Authorization", "Bearer valid-token")
+	request.Header.Set("Content-Type", "application/x-tar")
+
+	handler.ServeHTTP(recorder, request)
+
+	if recorder.Code != http.StatusAccepted {
+		t.Fatalf("status = %d, want %d; body = %q", recorder.Code, http.StatusAccepted, recorder.Body.String())
+	}
+	if submitted.PipelineID != "reports" {
+		t.Fatalf("submitted pipeline = %q, want reports", submitted.PipelineID)
+	}
+	var response uploadAcceptedResponse
+	if err := json.Unmarshal(recorder.Body.Bytes(), &response); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if response.RunID != "reports.20260603T120000Z.abcdef12" || response.Status != UploadStatusAccepted {
+		t.Fatalf("response = %#v, want accepted run id", response)
+	}
+	if strings.Contains(recorder.Body.String(), "valid-token") {
+		t.Fatalf("response exposed token: %q", recorder.Body.String())
+	}
+}
+
+func TestUploadHTTPHandlerRejectsUnauthorizedRequests(t *testing.T) {
+	handler := uploadHTTPHandler{
+		coordinator: fakeUploadCoordinator{canAccept: true},
+		tokens:      map[string]string{"valid-token": "reports"},
+	}
+
+	for _, authHeader := range []string{"", "Bearer wrong-token"} {
+		recorder := httptest.NewRecorder()
+		request := httptest.NewRequest(http.MethodPost, "/upload", strings.NewReader("archive"))
+		request.Header.Set("Authorization", authHeader)
+		request.Header.Set("Content-Type", "application/x-tar")
+
+		handler.ServeHTTP(recorder, request)
+
+		if recorder.Code != http.StatusUnauthorized {
+			t.Fatalf("auth %q status = %d, want %d", authHeader, recorder.Code, http.StatusUnauthorized)
+		}
+		if strings.Contains(recorder.Body.String(), "valid-token") || strings.Contains(recorder.Body.String(), "wrong-token") {
+			t.Fatalf("unauthorized response exposed token: %q", recorder.Body.String())
+		}
+	}
+}
+
+func TestUploadHTTPHandlerRejectsUnsupportedOversizedFullQueueAndPipelineID(t *testing.T) {
+	tests := []struct {
+		name        string
+		canAccept   bool
+		url         string
+		contentType string
+		body        io.Reader
+		wantStatus  int
+	}{
+		{
+			name:        "unsupported content type",
+			canAccept:   true,
+			url:         "/upload",
+			contentType: "application/zip",
+			body:        strings.NewReader("archive"),
+			wantStatus:  http.StatusUnsupportedMediaType,
+		},
+		{
+			name:        "full queue",
+			canAccept:   false,
+			url:         "/upload",
+			contentType: "application/x-tar",
+			body:        &countingReader{reader: strings.NewReader("archive")},
+			wantStatus:  http.StatusServiceUnavailable,
+		},
+		{
+			name:        "submitted pipeline id",
+			canAccept:   true,
+			url:         "/upload?pipeline_id=reports",
+			contentType: "application/x-tar",
+			body:        strings.NewReader("archive"),
+			wantStatus:  http.StatusBadRequest,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			handler := uploadHTTPHandler{
+				coordinator: fakeUploadCoordinator{
+					canAccept: tt.canAccept,
+					submit: func(context.Context, UploadRequest) (UploadRunRecord, error) {
+						t.Fatal("Submit should not be called")
+						return UploadRunRecord{}, nil
+					},
+				},
+				tokens: map[string]string{"valid-token": "reports"},
+			}
+			recorder := httptest.NewRecorder()
+			request := httptest.NewRequest(http.MethodPost, tt.url, tt.body)
+			request.Header.Set("Authorization", "Bearer valid-token")
+			request.Header.Set("Content-Type", tt.contentType)
+
+			handler.ServeHTTP(recorder, request)
+
+			if recorder.Code != tt.wantStatus {
+				t.Fatalf("status = %d, want %d; body = %q", recorder.Code, tt.wantStatus, recorder.Body.String())
+			}
+			if reader, ok := tt.body.(*countingReader); ok && reader.reads != 0 {
+				t.Fatalf("full queue read body %d time(s), want zero", reader.reads)
+			}
+		})
+	}
+}
+
+func TestUploadHTTPHandlerMapsSubmitErrors(t *testing.T) {
+	tests := []struct {
+		name       string
+		err        error
+		wantStatus int
+	}{
+		{name: "oversized", err: ingest.ErrUploadTooLarge, wantStatus: http.StatusRequestEntityTooLarge},
+		{name: "unsupported", err: ingest.ErrUnsupportedContentType, wantStatus: http.StatusUnsupportedMediaType},
+		{name: "malformed", err: errors.New("malformed archive"), wantStatus: http.StatusBadRequest},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			handler := uploadHTTPHandler{
+				coordinator: fakeUploadCoordinator{
+					canAccept: true,
+					submit: func(context.Context, UploadRequest) (UploadRunRecord, error) {
+						return UploadRunRecord{}, tt.err
+					},
+				},
+				tokens: map[string]string{"valid-token": "reports"},
+			}
+			recorder := httptest.NewRecorder()
+			request := httptest.NewRequest(http.MethodPost, "/upload", strings.NewReader("archive"))
+			request.Header.Set("Authorization", "Bearer valid-token")
+			request.Header.Set("Content-Type", "application/x-tar")
+
+			handler.ServeHTTP(recorder, request)
+
+			if recorder.Code != tt.wantStatus {
+				t.Fatalf("status = %d, want %d; body = %q", recorder.Code, tt.wantStatus, recorder.Body.String())
+			}
+		})
+	}
+}
+
+func TestUploadHTTPHandlerRunStatusAndHealth(t *testing.T) {
+	finishedAt := time.Date(2026, 6, 3, 12, 0, 0, 0, time.UTC)
+	handler := uploadHTTPHandler{
+		coordinator: fakeUploadCoordinator{
+			canAccept: true,
+			status: func(runID UploadRunID) (UploadRunRecord, bool) {
+				if runID != "reports.20260603T120000Z.abcdef12" {
+					return UploadRunRecord{}, false
+				}
+				return UploadRunRecord{
+					ID:         runID,
+					PipelineID: "reports",
+					Status:     UploadStatusSucceeded,
+					FinishedAt: &finishedAt,
+				}, true
+			},
+		},
+		tokens: map[string]string{"valid-token": "reports"},
+	}
+
+	recorder := httptest.NewRecorder()
+	handler.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/healthz", nil))
+	if recorder.Code != http.StatusOK {
+		t.Fatalf("health status = %d, want %d", recorder.Code, http.StatusOK)
+	}
+
+	recorder = httptest.NewRecorder()
+	handler.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/runs/reports.20260603T120000Z.abcdef12", nil))
+	if recorder.Code != http.StatusOK {
+		t.Fatalf("run status = %d, want %d; body = %q", recorder.Code, http.StatusOK, recorder.Body.String())
+	}
+	var record UploadRunRecord
+	if err := json.Unmarshal(recorder.Body.Bytes(), &record); err != nil {
+		t.Fatalf("decode run status: %v", err)
+	}
+	if record.ID != "reports.20260603T120000Z.abcdef12" || record.Status != UploadStatusSucceeded {
+		t.Fatalf("record = %#v, want succeeded run status", record)
+	}
+
+	recorder = httptest.NewRecorder()
+	handler.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/runs/unknown", nil))
+	if recorder.Code != http.StatusNotFound {
+		t.Fatalf("unknown run status = %d, want %d", recorder.Code, http.StatusNotFound)
+	}
+}
+
+type countingReader struct {
+	reader io.Reader
+	reads  int
+}
+
+func (reader *countingReader) Read(data []byte) (int, error) {
+	reader.reads++
+	return reader.reader.Read(data)
+}
+
+func uploadHTTPTestConfig() config.Config {
+	size := config.ByteSize(1024)
+	retention := config.Duration(24 * time.Hour)
+	cfg := config.Config{
+		Server: config.Server{HTTP: config.HTTPServer{
+			Bind:           config.DefaultHTTPBind,
+			StagingRoot:    "/tmp/distributor-test",
+			MaxUploadSize:  &size,
+			QueueSize:      2,
+			MaxConcurrency: 1,
+			Retention:      &retention,
+		}},
+		Pipelines: []config.Pipeline{{
+			ID: "reports",
+			Source: config.Backend{
+				Backend: config.BackendHTTPUpload,
+				Upload: config.HTTPUpload{
+					TokenEnv:      "UPLOAD_TOKEN",
+					StagingPath:   "/tmp/distributor-test/reports",
+					MaxUploadSize: &size,
+				},
+			},
+			Destinations: []config.Destination{{
+				ID:      "local",
+				Backend: config.BackendLocal,
+				Path:    "/tmp/distributor-output",
+				Publish: &config.PublishPolicy{Source: true},
+			}},
+		}},
+	}
+	config.ApplyDefaults(&cfg)
+	return cfg
+}
+
+func uploadHTTPTestEnvironment(values map[string]string) config.Environment {
+	return config.NewEnvironment(values, func(string) (string, bool) {
+		return "", false
+	})
+}

internal/app/validate.go

@@ -5,28 +5,84 @@ import (
 	"fmt"
 	"io"
 
-	"gitea.maximumdirect.net/eric/distributor/internal/bundle"
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
 )
 
 type ValidateOptions struct {
-	Path   string
-	Stdout io.Writer
+	Path         string
+	ConfigPath   string
+	PipelineID   string
+	BundlePath   string
+	Stdout       io.Writer
+	OutputFormat OutputFormat
 }
 
 func Validate(ctx context.Context, options ValidateOptions) error {
-	if options.Path == "" {
-		return fmt.Errorf("validate command requires a path")
+	return validateWithBackendFactory(ctx, options, newBackendFactoryWithEnvironment)
+}
+
+func validateWithBackendFactory(ctx context.Context, options ValidateOptions, provider backendFactoryProvider) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
 	}
-	backend, err := newBackendFactory().openLocalPath(ctx, options.Path)
+	selection, err := selectSourceBundles(ctx, sourceCommandOptions{
+		CommandName: "validate",
+		Path:        options.Path,
+		ConfigPath:  options.ConfigPath,
+		PipelineID:  options.PipelineID,
+		BundlePath:  options.BundlePath,
+	}, provider)
 	if err != nil {
 		return err
 	}
-	bundles, err := bundle.Discover(ctx, backend, "")
+	return writeValidateResult(options, selection)
+}
+
+func validateConfigWithBackendFactory(ctx context.Context, cfg config.Config, options ValidateOptions, provider backendFactoryProvider) error {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return err
+	}
+	selection, err := selectSourceBundlesFromConfig(ctx, cfg, sourceCommandOptions{
+		CommandName: "validate",
+		PipelineID:  options.PipelineID,
+		BundlePath:  options.BundlePath,
+	}, provider)
 	if err != nil {
 		return err
 	}
+	return writeValidateResult(options, selection)
+}
+
+func writeValidateResult(options ValidateOptions, selection sourceSelection) error {
+	if IsJSONOutput(options.OutputFormat) {
+		return WriteJSONEnvelope(options.Stdout, "validate", true, selection.Warnings, validateResultFromSelection(selection), nil)
+	}
+	var err error
 	if options.Stdout != nil {
-		_, err = fmt.Fprintf(options.Stdout, "Validated %d bundle(s)\n", len(bundles))
+		if err := writeWarnings(options.Stdout, selection.Warnings); err != nil {
+			return err
+		}
+		if selection.ConfigMode {
+			_, err = fmt.Fprintf(options.Stdout, "Validated %d bundle(s) for pipeline %s source %s\n", len(selection.Bundles), selection.PipelineID, selection.SourceBackend)
+		} else {
+			_, err = fmt.Fprintf(options.Stdout, "Validated %d bundle(s)\n", len(selection.Bundles))
+		}
 	}
 	return err
 }
+
+type validateResult struct {
+	PipelineID    string                `json:"pipeline_id,omitempty"`
+	SourceBackend string                `json:"source_backend,omitempty"`
+	BundleCount   int                   `json:"bundle_count"`
+	Bundles       []bundleSummaryResult `json:"bundles"`
+}
+
+func validateResultFromSelection(selection sourceSelection) validateResult {
+	return validateResult{
+		PipelineID:    selection.PipelineID,
+		SourceBackend: selection.SourceBackend,
+		BundleCount:   len(selection.Bundles),
+		Bundles:       bundleSummariesFromBundles(selection.Bundles),
+	}
+}

internal/app/validate_test.go

@@ -3,9 +3,16 @@ package app
 import (
 	"bytes"
 	"context"
+	"encoding/json"
+	"os"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage/fake"
+	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
 )
 
 func TestValidateLocalBundle(t *testing.T) {
@@ -31,9 +38,227 @@ func TestValidateExampleSourceBundle(t *testing.T) {
 	}
 }
 
+func TestValidateConfiguredLocalSource(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	var stdout bytes.Buffer
+
+	err := Validate(context.Background(), ValidateOptions{
+		ConfigPath: testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
+		PipelineID: "reports",
+		Stdout:     &stdout,
+	})
+
+	if err != nil {
+		t.Fatalf("Validate() configured source error = %v", err)
+	}
+	if got, want := stdout.String(), "Validated 1 bundle(s) for pipeline reports source local\n"; got != want {
+		t.Fatalf("stdout = %q, want %q", got, want)
+	}
+}
+
+func TestValidateConfiguredSourceBundlePath(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "daily/one", testutil.BundleOptions{ID: "reports.one"})
+	testutil.WriteSourceBundle(t, sourceRoot, "daily/two", testutil.BundleOptions{ID: "reports.two"})
+	var stdout bytes.Buffer
+
+	err := Validate(context.Background(), ValidateOptions{
+		ConfigPath:   testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
+		PipelineID:   "reports",
+		BundlePath:   "daily/two",
+		Stdout:       &stdout,
+		OutputFormat: OutputFormatJSON,
+	})
+
+	if err != nil {
+		t.Fatalf("Validate() configured bundle error = %v", err)
+	}
+	result := decodeAppResult(t, stdout.String())
+	if result["pipeline_id"] != "reports" || result["source_backend"] != "local" || result["bundle_count"] != float64(1) {
+		t.Fatalf("result = %#v, want configured source summary", result)
+	}
+	bundles, ok := result["bundles"].([]any)
+	if !ok || len(bundles) != 1 {
+		t.Fatalf("bundles = %#v, want one bundle", result["bundles"])
+	}
+	sourceBundle, ok := bundles[0].(map[string]any)
+	if !ok || sourceBundle["path"] != "daily/two" || sourceBundle["id"] != "reports.two" {
+		t.Fatalf("bundle = %#v, want narrowed bundle", sourceBundle)
+	}
+}
+
+func TestValidateConfiguredRemoteSourcesThroughStorageAbstraction(t *testing.T) {
+	s3Source := fake.New()
+	testutil.WriteFakeSourceBundle(t, s3Source, "", testutil.BundleOptions{ID: "reports.s3"})
+	sshSource := fake.New()
+	testutil.WriteFakeSourceBundle(t, sshSource, "daily", testutil.BundleOptions{ID: "reports.ssh"})
+	cfg := config.Config{Pipelines: []config.Pipeline{
+		{
+			ID: "s3-reports",
+			Source: config.Backend{
+				Backend:  config.BackendS3,
+				Endpoint: "http://s3.test",
+				Bucket:   "source-bucket",
+			},
+			Destinations: []config.Destination{{
+				ID:      "archive",
+				Backend: config.BackendLocal,
+				Path:    t.TempDir(),
+			}},
+		},
+		{
+			ID: "ssh-reports",
+			Source: config.Backend{
+				Backend: config.BackendSSH,
+				Host:    "ssh.test",
+				Path:    "/source",
+			},
+			Destinations: []config.Destination{{
+				ID:      "archive",
+				Backend: config.BackendLocal,
+				Path:    t.TempDir(),
+			}},
+		},
+	}}
+	config.ApplyDefaults(&cfg)
+	provider := fakeBackendFactoryProvider(t, map[string]storage.Backend{
+		"s3:source-bucket": s3Source,
+		"ssh:/source":      sshSource,
+	})
+
+	var s3Stdout bytes.Buffer
+	if err := validateConfigWithBackendFactory(context.Background(), cfg, ValidateOptions{
+		PipelineID:   "s3-reports",
+		Stdout:       &s3Stdout,
+		OutputFormat: OutputFormatJSON,
+	}, provider); err != nil {
+		t.Fatalf("validate s3 source error = %v", err)
+	}
+	s3Result := decodeAppResult(t, s3Stdout.String())
+	if s3Result["source_backend"] != "s3" || s3Result["bundle_count"] != float64(1) {
+		t.Fatalf("s3 result = %#v, want one s3 bundle", s3Result)
+	}
+
+	var sshStdout bytes.Buffer
+	if err := validateConfigWithBackendFactory(context.Background(), cfg, ValidateOptions{
+		PipelineID: "ssh-reports",
+		BundlePath: "daily",
+		Stdout:     &sshStdout,
+	}, provider); err != nil {
+		t.Fatalf("validate ssh source error = %v", err)
+	}
+	if !strings.Contains(sshStdout.String(), "pipeline ssh-reports source ssh") {
+		t.Fatalf("ssh stdout = %q, want ssh source summary", sshStdout.String())
+	}
+}
+
+func TestValidateConfiguredSourceLoadsSecretsBeforeOpeningBackend(t *testing.T) {
+	sourceRoot := filepath.Join(t.TempDir(), "missing-source")
+	destinationRoot := t.TempDir()
+	configPath := writeConfigFile(t, `
+secrets:
+  directory: `+filepath.Join(t.TempDir(), "missing-secrets")+`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: archive
+        backend: local
+        path: `+destinationRoot+`
+`)
+
+	err := Validate(context.Background(), ValidateOptions{ConfigPath: configPath, PipelineID: "reports"})
+	if err == nil {
+		t.Fatal("Validate() error = nil, want secrets directory error")
+	}
+	if !strings.Contains(err.Error(), "load secrets directory") {
+		t.Fatalf("Validate() error = %v, want secrets directory error", err)
+	}
+	if strings.Contains(err.Error(), "missing-source") {
+		t.Fatalf("Validate() error = %v, opened source before loading secrets", err)
+	}
+}
+
+func TestValidateConfiguredSourcePrintsSecretConflictWarningWithoutValues(t *testing.T) {
+	name := "DISTRIBUTOR_TEST_VALIDATE_SECRET"
+	t.Setenv(name, "process-value")
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	secretsRoot := t.TempDir()
+	if err := os.WriteFile(filepath.Join(secretsRoot, name), []byte("secret-value\n"), 0o600); err != nil {
+		t.Fatalf("write secret: %v", err)
+	}
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	configPath := writeConfigFile(t, `
+secrets:
+  directory: `+secretsRoot+`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: archive
+        backend: local
+        path: `+destinationRoot+`
+`)
+
+	var stdout bytes.Buffer
+	err := Validate(context.Background(), ValidateOptions{
+		ConfigPath: configPath,
+		PipelineID: "reports",
+		Stdout:     &stdout,
+	})
+	if err != nil {
+		t.Fatalf("Validate() error = %v", err)
+	}
+	output := stdout.String()
+	if !strings.Contains(output, "secret "+name+" ignored because the real environment already has that variable") {
+		t.Fatalf("stdout = %q, want secret conflict warning", output)
+	}
+	if !strings.Contains(output, "Validated 1 bundle(s) for pipeline reports source local") {
+		t.Fatalf("stdout = %q, want validate summary", output)
+	}
+	if strings.Contains(output, "process-value") || strings.Contains(output, "secret-value") {
+		t.Fatalf("stdout exposed secret values: %q", output)
+	}
+}
+
+func TestValidateConfiguredSourceRequiresPipeline(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+
+	err := Validate(context.Background(), ValidateOptions{
+		ConfigPath: testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot),
+	})
+
+	if err == nil || !strings.Contains(err.Error(), "requires --pipeline") {
+		t.Fatalf("Validate() error = %v, want required pipeline", err)
+	}
+}
+
 func TestValidateRequiresPath(t *testing.T) {
 	err := Validate(context.Background(), ValidateOptions{})
 	if err == nil || !strings.Contains(err.Error(), "requires a path") {
 		t.Fatalf("Validate() error = %v, want required path", err)
 	}
 }
+
+func decodeAppResult(t *testing.T, output string) map[string]any {
+	t.Helper()
+	var envelope map[string]any
+	if err := json.Unmarshal([]byte(output), &envelope); err != nil {
+		t.Fatalf("decode output: %v; output = %q", err, output)
+	}
+	result, ok := envelope["result"].(map[string]any)
+	if !ok {
+		t.Fatalf("result = %#v, want object", envelope["result"])
+	}
+	return result
+}

internal/bundle/digest.go

@@ -1,49 +1,19 @@
 package bundle
 
-import (
-	"crypto/sha256"
-	"encoding/hex"
-	"fmt"
-	"regexp"
-	"strconv"
-	"strings"
-)
-
-var digestPattern = regexp.MustCompile(`^sha256:[0-9a-f]{64}$`)
+import publicbundle "gitea.maximumdirect.net/eric/distributor/pkg/bundle"
 
 func ValidateDigest(value string) error {
-	if !digestPattern.MatchString(value) {
-		return fmt.Errorf("must be lowercase sha256:<64 hex>")
-	}
-	return nil
+	return publicbundle.ValidateDigest(value)
 }
 
 func FileDigest(data []byte) string {
-	sum := sha256.Sum256(data)
-	return "sha256:" + hex.EncodeToString(sum[:])
+	return publicbundle.FileDigest(data)
 }
 
 func BundleDigest(files []ManifestFile) string {
-	canonical := CanonicalFilePayload(files)
-	sum := sha256.Sum256([]byte(canonical))
-	return "sha256:" + hex.EncodeToString(sum[:])
+	return publicbundle.BundleDigest(files)
 }
 
 func CanonicalFilePayload(files []ManifestFile) string {
-	var builder strings.Builder
-	builder.WriteByte('[')
-	for index, file := range files {
-		if index > 0 {
-			builder.WriteByte(',')
-		}
-		builder.WriteString(`{"path":`)
-		builder.WriteString(strconv.Quote(file.Path))
-		builder.WriteString(`,"sha256":`)
-		builder.WriteString(strconv.Quote(file.SHA256))
-		builder.WriteString(`,"size":`)
-		builder.WriteString(strconv.FormatInt(file.Size, 10))
-		builder.WriteByte('}')
-	}
-	builder.WriteByte(']')
-	return builder.String()
+	return publicbundle.CanonicalFilePayload(files)
 }

internal/bundle/manifest.go

@@ -1,110 +1,32 @@
 package bundle
 
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io"
-	"time"
-)
+import publicbundle "gitea.maximumdirect.net/eric/distributor/pkg/bundle"
 
-const ManifestName = "manifest.json"
+const ManifestName = publicbundle.ManifestName
 
-type Manifest struct {
-	SchemaVersion int            `json:"schema_version"`
-	ID            string         `json:"id"`
-	Digest        string         `json:"digest"`
-	Created       time.Time      `json:"created"`
-	Files         []ManifestFile `json:"files"`
-}
+const SchemaVersion = publicbundle.SchemaVersion
 
-type ManifestFile struct {
-	Path   string `json:"path"`
-	SHA256 string `json:"sha256"`
-	Size   int64  `json:"size"`
-}
+type Manifest = publicbundle.Manifest
+
+type ManifestFile = publicbundle.ManifestFile
 
 type Bundle struct {
 	RootRelativePath string
 	Manifest         Manifest
 }
 
-type rawManifest struct {
-	SchemaVersion *int              `json:"schema_version"`
-	ID            *string           `json:"id"`
-	Digest        *string           `json:"digest"`
-	Created       *string           `json:"created"`
-	Files         []rawManifestFile `json:"files"`
-}
-
-type rawManifestFile struct {
-	Path   *string `json:"path"`
-	SHA256 *string `json:"sha256"`
-	Size   *int64  `json:"size"`
-}
-
 func ParseManifest(data []byte) (Manifest, error) {
-	decoder := json.NewDecoder(bytes.NewReader(data))
-	var raw rawManifest
-	if err := decoder.Decode(&raw); err != nil {
-		return Manifest{}, fmt.Errorf("parse manifest: %w", err)
-	}
-	var extra any
-	if err := decoder.Decode(&extra); err != io.EOF {
-		return Manifest{}, fmt.Errorf("parse manifest: trailing data")
-	}
-
-	var manifest Manifest
-	if raw.SchemaVersion == nil {
-		return Manifest{}, fmt.Errorf("manifest schema_version is required")
-	}
-	manifest.SchemaVersion = *raw.SchemaVersion
-	if raw.ID == nil || *raw.ID == "" {
-		return Manifest{}, fmt.Errorf("manifest id is required")
-	}
-	manifest.ID = *raw.ID
-	if raw.Digest == nil || *raw.Digest == "" {
-		return Manifest{}, fmt.Errorf("manifest digest is required")
-	}
-	manifest.Digest = *raw.Digest
-	if raw.Created == nil || *raw.Created == "" {
-		return Manifest{}, fmt.Errorf("manifest created is required")
-	}
-	created, err := time.Parse(time.RFC3339, *raw.Created)
-	if err != nil {
-		return Manifest{}, fmt.Errorf("manifest created must be RFC3339: %w", err)
-	}
-	manifest.Created = created
-	if len(raw.Files) == 0 {
-		return Manifest{}, fmt.Errorf("manifest files is required")
-	}
-
-	for index, rawFile := range raw.Files {
-		file, err := parseManifestFile(index, rawFile)
-		if err != nil {
-			return Manifest{}, err
-		}
-		manifest.Files = append(manifest.Files, file)
-	}
-	if err := ValidateManifest(manifest); err != nil {
-		return Manifest{}, fmt.Errorf("manifest %w", err)
-	}
-	return manifest, nil
+	return publicbundle.ParseManifest(data)
 }
 
-func parseManifestFile(index int, raw rawManifestFile) (ManifestFile, error) {
-	if raw.Path == nil || *raw.Path == "" {
-		return ManifestFile{}, fmt.Errorf("manifest files[%d].path is required", index)
-	}
-	if raw.SHA256 == nil || *raw.SHA256 == "" {
-		return ManifestFile{}, fmt.Errorf("manifest files[%d].sha256 is required", index)
-	}
-	if raw.Size == nil {
-		return ManifestFile{}, fmt.Errorf("manifest files[%d].size is required", index)
-	}
-	return ManifestFile{
-		Path:   *raw.Path,
-		SHA256: *raw.SHA256,
-		Size:   *raw.Size,
-	}, nil
+func MarshalManifest(manifest Manifest) ([]byte, error) {
+	return publicbundle.MarshalManifest(manifest)
+}
+
+func ValidateManifest(manifest Manifest) error {
+	return publicbundle.ValidateManifest(manifest)
+}
+
+func ValidateSourcePath(path string) error {
+	return publicbundle.ValidateSourcePath(path)
 }

internal/bundle/manifest_test.go

@@ -70,11 +70,19 @@ func TestParseManifestRejectsInvalidDigestFormat(t *testing.T) {
 
 func TestParseManifestRejectsUnsafeFilePaths(t *testing.T) {
 	tests := []string{
+		`"path": ""`,
+		`"path": "."`,
+		`"path": "./report.md"`,
 		`"path": "../report.md"`,
 		`"path": "/report.md"`,
 		`"path": "nested/../report.md"`,
+		`"path": "nested/./report.md"`,
+		`"path": "nested//report.md"`,
+		`"path": "nested\\report.md"`,
 		`"path": "manifest.json"`,
+		`"path": "nested/manifest.json"`,
 		`"path": "` + storage.StateFileName + `"`,
+		`"path": "nested/` + storage.StateFileName + `"`,
 	}
 	for _, replacement := range tests {
 		t.Run(replacement, func(t *testing.T) {
@@ -128,6 +136,16 @@ func TestValidateManifestRejectsInvalidManifest(t *testing.T) {
 			manifest.Digest = BundleDigest(manifest.Files)
 			return manifest
 		},
+		"nested manifest path": func(manifest Manifest) Manifest {
+			manifest.Files[0].Path = "nested/manifest.json"
+			manifest.Digest = BundleDigest(manifest.Files)
+			return manifest
+		},
+		"nested state path": func(manifest Manifest) Manifest {
+			manifest.Files[0].Path = "nested/" + storage.StateFileName
+			manifest.Digest = BundleDigest(manifest.Files)
+			return manifest
+		},
 		"duplicate path": func(manifest Manifest) Manifest {
 			manifest.Files[1].Path = manifest.Files[0].Path
 			manifest.Digest = BundleDigest(manifest.Files)

internal/bundle/validate.go

@@ -7,55 +7,6 @@ import (
 	"gitea.maximumdirect.net/eric/distributor/internal/storage"
 )
 
-func ValidateSourcePath(path string) error {
-	if err := storage.ValidatePath(path); err != nil {
-		return err
-	}
-	switch path {
-	case ManifestName, storage.StateFileName:
-		return fmt.Errorf("%q is reserved", path)
-	}
-	return nil
-}
-
-func ValidateManifest(manifest Manifest) error {
-	if manifest.SchemaVersion != 1 {
-		return fmt.Errorf("schema_version must be 1")
-	}
-	if manifest.ID == "" {
-		return fmt.Errorf("id is required")
-	}
-	if err := ValidateDigest(manifest.Digest); err != nil {
-		return fmt.Errorf("digest: %w", err)
-	}
-	if manifest.Created.IsZero() {
-		return fmt.Errorf("created is required")
-	}
-	if len(manifest.Files) == 0 {
-		return fmt.Errorf("files is required")
-	}
-	seen := make(map[string]struct{}, len(manifest.Files))
-	for index, file := range manifest.Files {
-		if err := ValidateSourcePath(file.Path); err != nil {
-			return fmt.Errorf("files[%d].path: %w", index, err)
-		}
-		if err := ValidateDigest(file.SHA256); err != nil {
-			return fmt.Errorf("files[%d].sha256: %w", index, err)
-		}
-		if file.Size < 0 {
-			return fmt.Errorf("files[%d].size must be non-negative", index)
-		}
-		if _, exists := seen[file.Path]; exists {
-			return fmt.Errorf("files[%d].path duplicates %q", index, file.Path)
-		}
-		seen[file.Path] = struct{}{}
-	}
-	if actual := BundleDigest(manifest.Files); actual != manifest.Digest {
-		return fmt.Errorf("digest mismatch: got %s want %s", actual, manifest.Digest)
-	}
-	return nil
-}
-
 func Validate(ctx context.Context, backend storage.Backend, bundleRoot string) (Bundle, error) {
 	return validateAt(ctx, backend, bundleRoot, bundleRoot)
 }

internal/bundle/validate_test.go

@@ -65,6 +65,38 @@ func TestValidateRejectsSymlinkFile(t *testing.T) {
 	assertErrorContains(t, err, "regular file")
 }
 
+func TestValidateRejectsUnsafeManifestPaths(t *testing.T) {
+	tests := []string{
+		"",
+		".",
+		"./report.md",
+		"../report.md",
+		"/report.md",
+		"nested/../report.md",
+		"nested/./report.md",
+		"nested//report.md",
+		`nested\report.md`,
+		ManifestName,
+		storage.StateFileName,
+		"nested/" + ManifestName,
+		"nested/" + storage.StateFileName,
+	}
+	for _, path := range tests {
+		t.Run(path, func(t *testing.T) {
+			backend := validFakeBundle(t)
+			manifest := validFixtureManifest(t)
+			manifest.Files[0].Path = path
+			manifest.Digest = BundleDigest(manifest.Files)
+			writeManifest(t, backend, manifest)
+
+			_, err := Validate(context.Background(), backend, "")
+			if err == nil {
+				t.Fatal("Validate() error = nil, want unsafe path error")
+			}
+		})
+	}
+}
+
 func validFakeBundle(t *testing.T) *fake.Backend {
 	t.Helper()
 	backend := fake.New()

internal/cli/flags.go

@@ -0,0 +1,12 @@
+package cli
+
+import (
+	"flag"
+	"io"
+)
+
+func newFlagSet(name string, stderr io.Writer) *flag.FlagSet {
+	flags := flag.NewFlagSet(name, flag.ContinueOnError)
+	flags.SetOutput(stderr)
+	return flags
+}

internal/cli/format.go

@@ -0,0 +1,22 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"io"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/app"
+)
+
+func addFormatFlag(flags *flag.FlagSet) *string {
+	return flags.String("format", string(app.OutputFormatText), "output format: text or json")
+}
+
+func parseOutputFormat(stderr io.Writer, command, raw string) (app.OutputFormat, bool) {
+	format := app.OutputFormat(raw)
+	if err := app.ValidateOutputFormat(format); err != nil {
+		fmt.Fprintf(stderr, "%s: %s --format: %s\n", app.Name, command, err)
+		return "", false
+	}
+	return app.NormalizeOutputFormat(format), true
+}

internal/cli/inspect.go

@@ -13,11 +13,18 @@ func inspectCommand(ctx context.Context, args []string, stdout, stderr io.Writer
 		printInspectHelp(stdout)
 		return exitOK
 	}
-	path, ok := parseOptionalPathArg(stderr, "inspect", args)
+	parsed, ok := parseSourceDiagnosticArgs(stderr, "inspect", args)
 	if !ok {
 		return exitUsage
 	}
-	if err := app.Inspect(ctx, app.InspectOptions{Path: path, Stdout: stdout}); err != nil {
+	if err := app.Inspect(ctx, app.InspectOptions{
+		Path:         parsed.Path,
+		ConfigPath:   parsed.ConfigPath,
+		PipelineID:   parsed.PipelineID,
+		BundlePath:   parsed.BundlePath,
+		Stdout:       stdout,
+		OutputFormat: parsed.OutputFormat,
+	}); err != nil {
 		return fail(stderr, err)
 	}
 	return exitOK
@@ -25,8 +32,16 @@ func inspectCommand(ctx context.Context, args []string, stdout, stderr io.Writer
 
 func printInspectHelp(w io.Writer) {
 	fmt.Fprint(w, `Usage:
-  distributor inspect <path>
+  distributor inspect [--format text|json] <path>
+  distributor inspect --config <path> --pipeline <id> [--bundle <path>] [--format text|json]
 
-Print a normalized summary of local source bundles.
+Options:
+  --config <path>     Path to config file for configured source inspection
+  --pipeline <id>     Pipeline id to inspect in config mode
+  --bundle <path>     Source-root-relative bundle path to inspect
+  --format text|json  Output format
+
+Print a normalized summary of local source bundles or a configured pipeline
+source.
 `)
 }

internal/cli/manifest.go

@@ -0,0 +1,137 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/app"
+)
+
+func manifestCommand(ctx context.Context, args []string, stdout, stderr io.Writer) int {
+	if len(args) == 0 || args[0] == "-h" || args[0] == "--help" || args[0] == "help" {
+		printManifestHelp(stdout)
+		return exitOK
+	}
+	switch args[0] {
+	case "create":
+		return manifestCreateCommand(ctx, args[1:], stdout, stderr)
+	default:
+		fmt.Fprintf(stderr, "%s: manifest unknown command %q\n\n", app.Name, args[0])
+		printManifestHelp(stderr)
+		return exitUsage
+	}
+}
+
+func manifestCreateCommand(ctx context.Context, args []string, stdout, stderr io.Writer) int {
+	if hasHelp(args) {
+		printManifestCreateHelp(stdout)
+		return exitOK
+	}
+	flags := newFlagSet("manifest create", stderr)
+	id := flags.String("id", "", "source bundle id")
+	created := flags.String("created", "", "source created timestamp")
+	overwrite := flags.Bool("overwrite", false, "replace an existing manifest.json")
+	formatFlag := addFormatFlag(flags)
+	var files repeatedFlag
+	flags.Var(&files, "file", "bundle-relative file to include")
+	flagArgs, positionalArgs, ok := splitManifestCreateArgs(stderr, args)
+	if !ok {
+		return exitUsage
+	}
+	if err := flags.Parse(flagArgs); err != nil {
+		return exitUsage
+	}
+	if len(positionalArgs) != 1 {
+		fmt.Fprintf(stderr, "%s: manifest create requires exactly one bundle path\n", app.Name)
+		return exitUsage
+	}
+	format, ok := parseOutputFormat(stderr, "manifest create", *formatFlag)
+	if !ok {
+		return exitUsage
+	}
+	err := app.ManifestCreate(ctx, app.ManifestCreateOptions{
+		Root:         positionalArgs[0],
+		ID:           *id,
+		Created:      *created,
+		Files:        []string(files),
+		Overwrite:    *overwrite,
+		Stdout:       stdout,
+		OutputFormat: format,
+	})
+	if err != nil {
+		return fail(stderr, err)
+	}
+	return exitOK
+}
+
+func splitManifestCreateArgs(stderr io.Writer, args []string) ([]string, []string, bool) {
+	var flagArgs []string
+	var positionalArgs []string
+	for index := 0; index < len(args); index++ {
+		arg := args[index]
+		switch arg {
+		case "--overwrite":
+			flagArgs = append(flagArgs, arg)
+		case "--id", "--created", "--file", "--format":
+			if index+1 >= len(args) {
+				fmt.Fprintf(stderr, "%s: manifest create %s requires a value\n", app.Name, arg)
+				return nil, nil, false
+			}
+			flagArgs = append(flagArgs, arg, args[index+1])
+			index++
+		default:
+			if strings.HasPrefix(arg, "--id=") ||
+				strings.HasPrefix(arg, "--created=") ||
+				strings.HasPrefix(arg, "--file=") ||
+				strings.HasPrefix(arg, "--format=") {
+				flagArgs = append(flagArgs, arg)
+				continue
+			}
+			if strings.HasPrefix(arg, "-") {
+				flagArgs = append(flagArgs, arg)
+				continue
+			}
+			positionalArgs = append(positionalArgs, arg)
+		}
+	}
+	return flagArgs, positionalArgs, true
+}
+
+type repeatedFlag []string
+
+func (f *repeatedFlag) String() string {
+	return fmt.Sprint([]string(*f))
+}
+
+func (f *repeatedFlag) Set(value string) error {
+	*f = append(*f, value)
+	return nil
+}
+
+func printManifestHelp(w io.Writer) {
+	fmt.Fprint(w, `Usage:
+  distributor manifest <command> [options]
+
+Commands:
+  create    Create a source bundle manifest
+
+Use "distributor manifest <command> --help" for command-specific help.
+`)
+}
+
+func printManifestCreateHelp(w io.Writer) {
+	fmt.Fprint(w, `Usage:
+  distributor manifest create <bundle-path> --id <bundle-id> [options]
+
+Options:
+  --id <bundle-id>     Source bundle id
+  --file <path>        Bundle-relative file to include; repeatable
+  --created <time>     RFC3339 source created timestamp
+  --overwrite          Replace an existing manifest.json
+  --format text|json   Output format
+
+Create manifest.json for a local source bundle directory.
+`)
+}

internal/cli/root.go

@@ -29,10 +29,14 @@ func Execute(ctx context.Context, args []string, stdout, stderr io.Writer) int {
 		return versionCommand(ctx, args[1:], stdout, stderr)
 	case "run":
 		return runCommand(ctx, args[1:], stdout, stderr)
+	case "serve":
+		return serveCommand(ctx, args[1:], stdout, stderr)
 	case "validate":
 		return validateCommand(ctx, args[1:], stdout, stderr)
 	case "inspect":
 		return inspectCommand(ctx, args[1:], stdout, stderr)
+	case "manifest":
+		return manifestCommand(ctx, args[1:], stdout, stderr)
 	default:
 		fmt.Fprintf(stderr, "%s: unknown command %q\n\n", app.Name, args[0])
 		printRootHelp(stderr)
@@ -49,8 +53,10 @@ Usage:
 Commands:
   version    Print version information
   run        Run configured distribution pipelines
+  serve      Run the HTTP upload server
   validate   Validate a source bundle or bundle tree
   inspect    Inspect bundles or distributor state
+  manifest   Create source bundle manifests
 
 Use "%s <command> --help" for command-specific help.
 `, app.Name, app.Name, app.Name)

internal/cli/root_test.go

@@ -3,15 +3,43 @@ package cli
 import (
 	"bytes"
 	"context"
+	"encoding/json"
+	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
 
+	"gitea.maximumdirect.net/eric/distributor/internal/app"
 	"gitea.maximumdirect.net/eric/distributor/internal/storage"
 	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
+	producerbundle "gitea.maximumdirect.net/eric/distributor/pkg/bundle"
 )
 
+func decodeEnvelope(t *testing.T, stdout *bytes.Buffer) map[string]any {
+	t.Helper()
+	decoder := json.NewDecoder(strings.NewReader(stdout.String()))
+	var envelope map[string]any
+	if err := decoder.Decode(&envelope); err != nil {
+		t.Fatalf("decode JSON envelope: %v; stdout = %q", err, stdout.String())
+	}
+	var extra any
+	if err := decoder.Decode(&extra); err != io.EOF {
+		t.Fatalf("stdout contains more than one JSON document: %q", stdout.String())
+	}
+	return envelope
+}
+
+func envelopeResult(t *testing.T, envelope map[string]any) map[string]any {
+	t.Helper()
+	result, ok := envelope["result"].(map[string]any)
+	if !ok {
+		t.Fatalf("result = %#v, want object", envelope["result"])
+	}
+	return result
+}
+
 func TestExecuteRootHelp(t *testing.T) {
 	var stdout, stderr bytes.Buffer
 
@@ -44,6 +72,71 @@ func TestExecuteVersion(t *testing.T) {
 	}
 }
 
+func TestExecuteVersionJSON(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"version", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "version" || envelope["ok"] != true {
+		t.Fatalf("envelope = %#v, want version ok", envelope)
+	}
+	result := envelopeResult(t, envelope)
+	if result["application"] != "distributor" || result["version"] != "dev" {
+		t.Fatalf("result = %#v, want application/version", result)
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteServeParsesConfig(t *testing.T) {
+	originalServeApp := serveApp
+	defer func() {
+		serveApp = originalServeApp
+	}()
+	var gotOptions app.ServeOptions
+	serveApp = func(_ context.Context, options app.ServeOptions) error {
+		gotOptions = options
+		return nil
+	}
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"serve", "--config", "config.yml"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	if gotOptions.ConfigPath != "config.yml" {
+		t.Fatalf("ConfigPath = %q, want config.yml", gotOptions.ConfigPath)
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("stdout = %q, want empty", stdout.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteRejectsInvalidFormat(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"version", "--format", "xml"}, &stdout, &stderr)
+
+	if code != exitUsage {
+		t.Fatalf("exit code = %d, want %d", code, exitUsage)
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("stdout = %q, want empty", stdout.String())
+	}
+	if !strings.Contains(stderr.String(), "format must be text or json") {
+		t.Fatalf("stderr = %q, want invalid format error", stderr.String())
+	}
+}
+
 func TestExecuteValidate(t *testing.T) {
 	var stdout, stderr bytes.Buffer
 
@@ -57,6 +150,63 @@ func TestExecuteValidate(t *testing.T) {
 	}
 }
 
+func TestExecuteValidateJSON(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"validate", "--format", "json", filepath.Join("..", "bundle", "testdata", "valid_bundle")}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "validate" || envelope["ok"] != true {
+		t.Fatalf("envelope = %#v, want validate ok", envelope)
+	}
+	result := envelopeResult(t, envelope)
+	if result["bundle_count"] != float64(1) {
+		t.Fatalf("result = %#v, want one bundle", result)
+	}
+}
+
+func TestExecuteValidateConfiguredSource(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	configPath := testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot)
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"validate", "--config", configPath, "--pipeline", "reports"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	if got, want := stdout.String(), "Validated 1 bundle(s) for pipeline reports source local\n"; got != want {
+		t.Fatalf("stdout = %q, want %q", got, want)
+	}
+}
+
+func TestExecuteValidateConfiguredSourceJSON(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "daily", testutil.BundleOptions{ID: "reports.daily"})
+	configPath := testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot)
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"validate", "--config", configPath, "--pipeline", "reports", "--bundle", "daily", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "validate" || envelope["ok"] != true {
+		t.Fatalf("envelope = %#v, want validate ok", envelope)
+	}
+	result := envelopeResult(t, envelope)
+	if result["pipeline_id"] != "reports" || result["source_backend"] != "local" || result["bundle_count"] != float64(1) {
+		t.Fatalf("result = %#v, want configured source metadata", result)
+	}
+}
+
 func TestExecuteValidateArgs(t *testing.T) {
 	validPath := filepath.Join("..", "bundle", "testdata", "valid_bundle")
 	tests := []struct {
@@ -84,6 +234,36 @@ func TestExecuteValidateArgs(t *testing.T) {
 			wantCode:   exitUsage,
 			wantStderr: "accepts at most one path",
 		},
+		{
+			name:       "path plus config",
+			args:       []string{"validate", "--config", "config.yml", "--pipeline", "reports", validPath},
+			wantCode:   exitUsage,
+			wantStderr: "does not accept a local path",
+		},
+		{
+			name:       "pipeline without config",
+			args:       []string{"validate", "--pipeline", "reports"},
+			wantCode:   exitUsage,
+			wantStderr: "requires --config",
+		},
+		{
+			name:       "bundle without config",
+			args:       []string{"validate", "--bundle", "daily"},
+			wantCode:   exitUsage,
+			wantStderr: "requires --config",
+		},
+		{
+			name:       "config without pipeline",
+			args:       []string{"validate", "--config", "config.yml"},
+			wantCode:   exitUsage,
+			wantStderr: "requires --pipeline",
+		},
+		{
+			name:       "invalid format",
+			args:       []string{"validate", "--format", "xml", validPath},
+			wantCode:   exitUsage,
+			wantStderr: "format must be text or json",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -115,6 +295,56 @@ func TestExecuteInspect(t *testing.T) {
 	}
 }
 
+func TestExecuteInspectJSON(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"inspect", "--format", "json", filepath.Join("..", "bundle", "testdata", "valid_bundle")}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "inspect" || envelope["ok"] != true {
+		t.Fatalf("envelope = %#v, want inspect ok", envelope)
+	}
+	result := envelopeResult(t, envelope)
+	bundles, ok := result["bundles"].([]any)
+	if !ok || len(bundles) != 1 {
+		t.Fatalf("bundles = %#v, want one bundle", result["bundles"])
+	}
+	bundle, ok := bundles[0].(map[string]any)
+	if !ok {
+		t.Fatalf("bundle = %#v, want object", bundles[0])
+	}
+	if bundle["id"] != "weather.daily.brentwood.2026-05-30" || bundle["file_count"] != float64(2) || bundle["total_size"] != float64(24) {
+		t.Fatalf("bundle = %#v, want normalized metadata", bundle)
+	}
+}
+
+func TestExecuteInspectConfiguredSource(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "daily", testutil.BundleOptions{ID: "reports.daily"})
+	configPath := testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot)
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"inspect", "--config", configPath, "--pipeline", "reports"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	for _, want := range []string{
+		"Pipeline: reports",
+		"Source: local",
+		"path=daily",
+		"id=reports.daily",
+	} {
+		if !strings.Contains(stdout.String(), want) {
+			t.Fatalf("stdout = %q, want substring %q", stdout.String(), want)
+		}
+	}
+}
+
 func TestExecuteInspectArgs(t *testing.T) {
 	validPath := filepath.Join("..", "bundle", "testdata", "valid_bundle")
 	tests := []struct {
@@ -142,6 +372,36 @@ func TestExecuteInspectArgs(t *testing.T) {
 			wantCode:   exitUsage,
 			wantStderr: "accepts at most one path",
 		},
+		{
+			name:       "path plus config",
+			args:       []string{"inspect", "--config", "config.yml", "--pipeline", "reports", validPath},
+			wantCode:   exitUsage,
+			wantStderr: "does not accept a local path",
+		},
+		{
+			name:       "pipeline without config",
+			args:       []string{"inspect", "--pipeline", "reports"},
+			wantCode:   exitUsage,
+			wantStderr: "requires --config",
+		},
+		{
+			name:       "bundle without config",
+			args:       []string{"inspect", "--bundle", "daily"},
+			wantCode:   exitUsage,
+			wantStderr: "requires --config",
+		},
+		{
+			name:       "config without pipeline",
+			args:       []string{"inspect", "--config", "config.yml"},
+			wantCode:   exitUsage,
+			wantStderr: "requires --pipeline",
+		},
+		{
+			name:       "invalid format",
+			args:       []string{"inspect", "--format", "xml", validPath},
+			wantCode:   exitUsage,
+			wantStderr: "format must be text or json",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -160,6 +420,206 @@ func TestExecuteInspectArgs(t *testing.T) {
 	}
 }
 
+func TestExecuteManifestCreateExplicitFiles(t *testing.T) {
+	root := t.TempDir()
+	writeCLIFile(t, root, "b.txt", "bravo")
+	writeCLIFile(t, root, "nested/a.txt", "alpha")
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{
+		"manifest", "create", root,
+		"--id", "reports.explicit",
+		"--created", "2026-06-01T11:00:00Z",
+		"--file", "b.txt",
+		"--file", "nested/a.txt",
+	}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	for _, want := range []string{
+		"created manifest.json",
+		"bundle: reports.explicit",
+		"files: 2",
+		"digest: sha256:",
+	} {
+		if !strings.Contains(stdout.String(), want) {
+			t.Fatalf("stdout = %q, want substring %q", stdout.String(), want)
+		}
+	}
+	manifest, err := producerbundle.LoadManifest(root)
+	if err != nil {
+		t.Fatalf("LoadManifest() error = %v", err)
+	}
+	if got, want := manifestPaths(manifest), []string{"b.txt", "nested/a.txt"}; !equalStrings(got, want) {
+		t.Fatalf("manifest paths = %v, want %v", got, want)
+	}
+	if err := producerbundle.ValidateBundle(root, manifest); err != nil {
+		t.Fatalf("ValidateBundle() error = %v", err)
+	}
+	var validateStdout, validateStderr bytes.Buffer
+	validateCode := Execute(context.Background(), []string{"validate", root}, &validateStdout, &validateStderr)
+	if validateCode != exitOK {
+		t.Fatalf("validate exit code = %d, want %d; stderr = %q", validateCode, exitOK, validateStderr.String())
+	}
+}
+
+func TestExecuteManifestCreateScansBundle(t *testing.T) {
+	root := t.TempDir()
+	writeCLIFile(t, root, "z.txt", "zulu")
+	writeCLIFile(t, root, ".env", "dotfile")
+	writeCLIFile(t, root, "nested/report.md", "# Report\n")
+	writeCLIFile(t, root, storage.StateFileName, "destination state")
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"manifest", "create", root, "--id", "reports.scan"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	manifest, err := producerbundle.LoadManifest(root)
+	if err != nil {
+		t.Fatalf("LoadManifest() error = %v", err)
+	}
+	if got, want := manifestPaths(manifest), []string{".env", "nested/report.md", "z.txt"}; !equalStrings(got, want) {
+		t.Fatalf("manifest paths = %v, want %v", got, want)
+	}
+}
+
+func TestExecuteManifestCreateJSON(t *testing.T) {
+	root := t.TempDir()
+	writeCLIFile(t, root, "report.md", "# Report\n")
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"manifest", "create", root, "--id", "reports.json", "--file", "report.md", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "manifest create" || envelope["ok"] != true {
+		t.Fatalf("envelope = %#v, want manifest create ok", envelope)
+	}
+	result := envelopeResult(t, envelope)
+	if result["id"] != "reports.json" || result["file_count"] != float64(1) {
+		t.Fatalf("result = %#v, want manifest summary", result)
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteManifestCreateOverwrite(t *testing.T) {
+	root := t.TempDir()
+	writeCLIFile(t, root, "report.md", "old\n")
+	var stdout, stderr bytes.Buffer
+	code := Execute(context.Background(), []string{"manifest", "create", root, "--id", "reports.old", "--file", "report.md"}, &stdout, &stderr)
+	if code != exitOK {
+		t.Fatalf("initial exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	writeCLIFile(t, root, "report.md", "new\n")
+
+	stdout.Reset()
+	stderr.Reset()
+	code = Execute(context.Background(), []string{"manifest", "create", root, "--id", "reports.new", "--file", "report.md"}, &stdout, &stderr)
+	if code != exitError {
+		t.Fatalf("overwrite exit code = %d, want %d", code, exitError)
+	}
+	if !strings.Contains(stderr.String(), "write manifest") {
+		t.Fatalf("stderr = %q, want write manifest error", stderr.String())
+	}
+	manifest, err := producerbundle.LoadManifest(root)
+	if err != nil {
+		t.Fatalf("LoadManifest() error = %v", err)
+	}
+	if manifest.ID != "reports.old" {
+		t.Fatalf("manifest id = %q, want reports.old", manifest.ID)
+	}
+
+	stdout.Reset()
+	stderr.Reset()
+	code = Execute(context.Background(), []string{"manifest", "create", root, "--id", "reports.new", "--file", "report.md", "--overwrite"}, &stdout, &stderr)
+	if code != exitOK {
+		t.Fatalf("overwrite exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	manifest, err = producerbundle.LoadManifest(root)
+	if err != nil {
+		t.Fatalf("LoadManifest() error = %v", err)
+	}
+	if manifest.ID != "reports.new" {
+		t.Fatalf("manifest id = %q, want reports.new", manifest.ID)
+	}
+}
+
+func TestExecuteManifestCreateRejectsSymlink(t *testing.T) {
+	root := t.TempDir()
+	writeCLIFile(t, root, "target.md", "# Report\n")
+	if err := os.Symlink("target.md", filepath.Join(root, "link.md")); err != nil {
+		t.Skipf("symlink unavailable: %v", err)
+	}
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"manifest", "create", root, "--id", "reports.link", "--file", "link.md"}, &stdout, &stderr)
+
+	if code != exitError {
+		t.Fatalf("exit code = %d, want %d", code, exitError)
+	}
+	if !strings.Contains(stderr.String(), "regular file") {
+		t.Fatalf("stderr = %q, want regular file error", stderr.String())
+	}
+}
+
+func TestExecuteManifestCreateArgs(t *testing.T) {
+	root := t.TempDir()
+	writeCLIFile(t, root, "report.md", "# Report\n")
+	tests := []struct {
+		name       string
+		args       []string
+		wantCode   int
+		wantStderr string
+	}{
+		{
+			name:       "missing path",
+			args:       []string{"manifest", "create", "--id", "reports.missing"},
+			wantCode:   exitUsage,
+			wantStderr: "requires exactly one bundle path",
+		},
+		{
+			name:       "missing id",
+			args:       []string{"manifest", "create", root},
+			wantCode:   exitError,
+			wantStderr: "requires --id",
+		},
+		{
+			name:       "bad created",
+			args:       []string{"manifest", "create", root, "--id", "reports.bad", "--created", "June 1"},
+			wantCode:   exitError,
+			wantStderr: "created must be RFC3339",
+		},
+		{
+			name:       "bad format",
+			args:       []string{"manifest", "create", root, "--id", "reports.bad", "--format", "xml"},
+			wantCode:   exitUsage,
+			wantStderr: "format must be text or json",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var stdout, stderr bytes.Buffer
+			code := Execute(context.Background(), tt.args, &stdout, &stderr)
+			if code != tt.wantCode {
+				t.Fatalf("exit code = %d, want %d; stderr = %q", code, tt.wantCode, stderr.String())
+			}
+			if stdout.Len() != 0 {
+				t.Fatalf("stdout = %q, want empty", stdout.String())
+			}
+			if !strings.Contains(stderr.String(), tt.wantStderr) {
+				t.Fatalf("stderr = %q, want substring %q", stderr.String(), tt.wantStderr)
+			}
+		})
+	}
+}
+
 func TestExecuteRunDryRun(t *testing.T) {
 	sourceRoot := t.TempDir()
 	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
@@ -172,14 +632,323 @@ func TestExecuteRunDryRun(t *testing.T) {
 	if code != exitOK {
 		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
 	}
-	if !strings.Contains(stdout.String(), "action=publish_new") {
-		t.Fatalf("stdout = %q, want config summary", stdout.String())
+	wantStdout := "Configured pipelines: 1\n" +
+		"- pipeline=reports source=local bundles=1 destinations=archive\n" +
+		"  - bundle=. destination=archive backend=local action=publish_new outputs=report.md,summary.txt reason=\"destination state is absent\"\n" +
+		"Final status: ok planned=1 publish_new=1 replace_older=0 force_replace=0 skipped=0 failed=0 dry_run=true fixed_path=0\n"
+	if got := stdout.String(); got != wantStdout {
+		t.Fatalf("stdout = %q, want %q", got, wantStdout)
 	}
 	if stderr.Len() != 0 {
 		t.Fatalf("stderr = %q, want empty", stderr.String())
 	}
 }
 
+func TestExecuteRunJSONDryRun(t *testing.T) {
+	sourceRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	configPath := testutil.WriteMinimalLocalConfig(t, sourceRoot, t.TempDir())
+
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--dry-run", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "run" || envelope["ok"] != true {
+		t.Fatalf("envelope = %#v, want run ok", envelope)
+	}
+	result := envelopeResult(t, envelope)
+	if result["dry_run"] != true {
+		t.Fatalf("result = %#v, want dry_run true", result)
+	}
+	pipelines, ok := result["pipelines"].([]any)
+	if !ok || len(pipelines) != 1 {
+		t.Fatalf("pipelines = %#v, want one pipeline", result["pipelines"])
+	}
+	pipeline, ok := pipelines[0].(map[string]any)
+	if !ok || pipeline["id"] != "reports" || pipeline["source_backend"] != "local" || pipeline["bundle_count"] != float64(1) {
+		t.Fatalf("pipeline = %#v, want reports/local summary", pipelines[0])
+	}
+	actions, ok := result["actions"].([]any)
+	if !ok || len(actions) != 1 {
+		t.Fatalf("actions = %#v, want one action", result["actions"])
+	}
+	action, ok := actions[0].(map[string]any)
+	if !ok || action["action"] != "publish_new" {
+		t.Fatalf("action = %#v, want publish_new", actions[0])
+	}
+	outputs, ok := action["outputs"].([]any)
+	if !ok || len(outputs) != 2 {
+		t.Fatalf("outputs = %#v, want source outputs", action["outputs"])
+	}
+	summary, ok := result["summary"].(map[string]any)
+	if !ok || summary["status"] != "ok" || summary["planned"] != float64(1) || summary["publish_new"] != float64(1) || summary["dry_run"] != true {
+		t.Fatalf("summary = %#v, want ok dry-run publish counters", result["summary"])
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteRunJSONDryRunReportsFixedPathMapping(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	configPath := filepath.Join(t.TempDir(), "config.yml")
+	if err := os.WriteFile(configPath, []byte(`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: latest
+        backend: local
+        path: `+destinationRoot+`
+        path_mapping:
+          mode: fixed
+`), 0o600); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--dry-run", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	warnings, ok := envelope["warnings"].([]any)
+	if !ok || len(warnings) != 1 {
+		t.Fatalf("warnings = %#v, want one fixed-path warning", envelope["warnings"])
+	}
+	warning, ok := warnings[0].(map[string]any)
+	if !ok || !strings.Contains(fmt.Sprint(warning["message"]), "path_mapping=fixed candidates=1 selected_bundle=.") {
+		t.Fatalf("warning = %#v, want fixed-path selection warning", warnings[0])
+	}
+	result := envelopeResult(t, envelope)
+	actions, ok := result["actions"].([]any)
+	if !ok || len(actions) != 1 {
+		t.Fatalf("actions = %#v, want one action", result["actions"])
+	}
+	action, ok := actions[0].(map[string]any)
+	if !ok || action["path_mapping"] != "fixed" || action["destination_path"] != "." || action["action"] != "publish_new" {
+		t.Fatalf("action = %#v, want fixed publish_new at root", actions[0])
+	}
+	summary, ok := result["summary"].(map[string]any)
+	if !ok || summary["fixed_path"] != float64(1) {
+		t.Fatalf("summary = %#v, want fixed_path 1", result["summary"])
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteRunJSONDryRunReportsLinks(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	configPath := filepath.Join(t.TempDir(), "config.yml")
+	if err := os.WriteFile(configPath, []byte(`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: web
+        backend: local
+        path: `+destinationRoot+`
+        links:
+          base_url: https://reports.example.com/archive
+          primary: source
+`), 0o600); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--dry-run", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	result := envelopeResult(t, envelope)
+	actions, ok := result["actions"].([]any)
+	if !ok || len(actions) != 1 {
+		t.Fatalf("actions = %#v, want one action", result["actions"])
+	}
+	action, ok := actions[0].(map[string]any)
+	if !ok || action["primary_url"] != "https://reports.example.com/archive/report.md" {
+		t.Fatalf("action = %#v, want primary URL", actions[0])
+	}
+	outputs, ok := action["outputs"].([]any)
+	if !ok || len(outputs) != 2 {
+		t.Fatalf("outputs = %#v, want two outputs", action["outputs"])
+	}
+	output, ok := outputs[0].(map[string]any)
+	if !ok || output["url"] != "https://reports.example.com/archive/report.md" {
+		t.Fatalf("output = %#v, want output URL", outputs[0])
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteRunJSONWarningsAreStructured(t *testing.T) {
+	name := "DISTRIBUTOR_TEST_CLI_JSON_SECRET"
+	t.Setenv(name, "process-value")
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	secretsRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	if err := os.WriteFile(filepath.Join(secretsRoot, name), []byte("secret-value\n"), 0o600); err != nil {
+		t.Fatalf("write secret: %v", err)
+	}
+	configPath := filepath.Join(t.TempDir(), "config.yml")
+	if err := os.WriteFile(configPath, []byte(`
+secrets:
+  directory: `+secretsRoot+`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: archive
+        backend: local
+        path: `+destinationRoot+`
+`), 0o600); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var stdout, stderr bytes.Buffer
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--dry-run", "--format", "json"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	warnings, ok := envelope["warnings"].([]any)
+	if !ok || len(warnings) != 1 {
+		t.Fatalf("warnings = %#v, want one warning", envelope["warnings"])
+	}
+	warning, ok := warnings[0].(map[string]any)
+	if !ok || !strings.Contains(fmt.Sprint(warning["message"]), name) {
+		t.Fatalf("warning = %#v, want secret name", warnings[0])
+	}
+	if strings.Contains(stdout.String(), "Warning:") || strings.Contains(stdout.String(), "process-value") || strings.Contains(stdout.String(), "secret-value") {
+		t.Fatalf("stdout exposed text warning or secret values: %q", stdout.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
+func TestExecuteRunJSONFatalSetupErrorWritesNoJSON(t *testing.T) {
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"run", "--config", filepath.Join(t.TempDir(), "missing.yml"), "--format", "json"}, &stdout, &stderr)
+
+	if code != exitError {
+		t.Fatalf("exit code = %d, want %d", code, exitError)
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("stdout = %q, want empty", stdout.String())
+	}
+	if !strings.Contains(stderr.String(), "no such file or directory") {
+		t.Fatalf("stderr = %q, want setup error", stderr.String())
+	}
+}
+
+func TestExecuteRunJSONPartialFailure(t *testing.T) {
+	sourceRoot := t.TempDir()
+	firstDestination := t.TempDir()
+	secondDestination := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	if err := os.WriteFile(filepath.Join(firstDestination, "unmanaged.txt"), []byte("data"), 0o600); err != nil {
+		t.Fatalf("write unmanaged file: %v", err)
+	}
+	configPath := filepath.Join(t.TempDir(), "config.yml")
+	if err := os.WriteFile(configPath, []byte(`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: archive-one
+        backend: local
+        path: `+firstDestination+`
+      - id: archive-two
+        backend: local
+        path: `+secondDestination+`
+`), 0o600); err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var stdout, stderr bytes.Buffer
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--format", "json"}, &stdout, &stderr)
+
+	if code != exitError {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitError, stderr.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty for partial JSON result", stderr.String())
+	}
+	envelope := decodeEnvelope(t, &stdout)
+	if envelope["command"] != "run" || envelope["ok"] != false {
+		t.Fatalf("envelope = %#v, want failed run envelope", envelope)
+	}
+	errors, ok := envelope["errors"].([]any)
+	if !ok || len(errors) != 1 {
+		t.Fatalf("errors = %#v, want one error", envelope["errors"])
+	}
+	result := envelopeResult(t, envelope)
+	summary, ok := result["summary"].(map[string]any)
+	if !ok || summary["status"] != "failed" || summary["failed"] != float64(1) {
+		t.Fatalf("summary = %#v, want failed summary", result["summary"])
+	}
+	actions, ok := result["actions"].([]any)
+	if !ok || len(actions) != 2 {
+		t.Fatalf("actions = %#v, want two actions", result["actions"])
+	}
+	if _, err := os.Stat(filepath.Join(secondDestination, storage.StateFileName)); err != nil {
+		t.Fatalf("second destination state stat error = %v", err)
+	}
+}
+
+func TestExecuteRunForceDryRunReportsWithoutWriting(t *testing.T) {
+	sourceRoot := t.TempDir()
+	destinationRoot := t.TempDir()
+	testutil.WriteSourceBundle(t, sourceRoot, "", testutil.BundleOptions{})
+	if err := os.WriteFile(filepath.Join(destinationRoot, "unmanaged.txt"), []byte("old"), 0o600); err != nil {
+		t.Fatalf("write unmanaged file: %v", err)
+	}
+	configPath := testutil.WriteMinimalLocalConfig(t, sourceRoot, destinationRoot)
+
+	var stdout, stderr bytes.Buffer
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--force", "--dry-run"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	if !strings.Contains(stdout.String(), "action=force_replace") {
+		t.Fatalf("stdout = %q, want force_replace", stdout.String())
+	}
+	if _, err := os.Stat(filepath.Join(destinationRoot, "unmanaged.txt")); err != nil {
+		t.Fatalf("unmanaged file stat error = %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(destinationRoot, storage.StateFileName)); !os.IsNotExist(err) {
+		t.Fatalf("state stat error = %v, want not exist", err)
+	}
+}
+
 func TestExecuteRunRejectsExtraPositionalArgs(t *testing.T) {
 	var stdout, stderr bytes.Buffer
 
@@ -223,3 +992,34 @@ func TestUnknownCommandIsUsageError(t *testing.T) {
 		t.Fatalf("stderr = %q, want unknown command error", stderr.String())
 	}
 }
+
+func manifestPaths(manifest producerbundle.Manifest) []string {
+	paths := make([]string, 0, len(manifest.Files))
+	for _, file := range manifest.Files {
+		paths = append(paths, file.Path)
+	}
+	return paths
+}
+
+func equalStrings(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for index := range a {
+		if a[index] != b[index] {
+			return false
+		}
+	}
+	return true
+}
+
+func writeCLIFile(t *testing.T, root, relative, body string) {
+	t.Helper()
+	path := filepath.Join(root, filepath.FromSlash(relative))
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatalf("mkdir %s: %v", filepath.Dir(path), err)
+	}
+	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
+		t.Fatalf("write %s: %v", path, err)
+	}
+}

internal/cli/run.go

@@ -2,7 +2,6 @@ package cli
 
 import (
 	"context"
-	"flag"
 	"fmt"
 	"io"
 
@@ -15,22 +14,32 @@ func runCommand(ctx context.Context, args []string, stdout, stderr io.Writer) in
 		return exitOK
 	}
 
-	flags := flag.NewFlagSet("run", flag.ContinueOnError)
-	flags.SetOutput(stderr)
+	flags := newFlagSet("run", stderr)
 	configPath := flags.String("config", "", "path to config file")
 	dryRun := flags.Bool("dry-run", false, "load and validate config without publishing")
+	force := flags.Bool("force", false, "allow explicit destructive replacement for supported conflicts")
+	formatFlag := addFormatFlag(flags)
 	if err := flags.Parse(args); err != nil {
 		return exitUsage
 	}
 	if rejectPositionalArgs(stderr, "run", flags.Args()) {
 		return exitUsage
 	}
+	format, ok := parseOutputFormat(stderr, "run", *formatFlag)
+	if !ok {
+		return exitUsage
+	}
 
 	if err := app.Run(ctx, app.RunOptions{
-		ConfigPath: *configPath,
-		DryRun:     *dryRun,
-		Stdout:     stdout,
+		ConfigPath:   *configPath,
+		DryRun:       *dryRun,
+		Force:        *force,
+		Stdout:       stdout,
+		OutputFormat: format,
 	}); err != nil {
+		if app.IsJSONOutput(format) && app.IsPartialResultError(err) {
+			return exitError
+		}
 		return fail(stderr, err)
 	}
 	return exitOK
@@ -38,13 +47,16 @@ func runCommand(ctx context.Context, args []string, stdout, stderr io.Writer) in
 
 func printRunHelp(w io.Writer) {
 	fmt.Fprint(w, `Usage:
-  distributor run --config <path> --dry-run
+  distributor run --config <path> [--dry-run] [--force] [--format text|json]
 
 Options:
   --config <path>  Path to config file
   --dry-run        Load and validate config without publishing
+  --force          Allow explicit destructive replacement for supported conflicts
+  --format text|json
+                   Output format
 
-Run discovers local source bundles, plans each configured destination, publishes
+Run discovers configured source bundles, plans each destination, publishes
 selected outputs unless --dry-run is set, and prints a final status summary.
 `)
 }

internal/cli/serve.go

@@ -0,0 +1,44 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/app"
+)
+
+var serveApp = app.Serve
+
+func serveCommand(ctx context.Context, args []string, stdout, stderr io.Writer) int {
+	if hasHelp(args) {
+		printServeHelp(stdout)
+		return exitOK
+	}
+
+	flags := newFlagSet("serve", stderr)
+	configPath := flags.String("config", "", "path to config file")
+	if err := flags.Parse(args); err != nil {
+		return exitUsage
+	}
+	if rejectPositionalArgs(stderr, "serve", flags.Args()) {
+		return exitUsage
+	}
+
+	if err := serveApp(ctx, app.ServeOptions{ConfigPath: *configPath}); err != nil {
+		return fail(stderr, err)
+	}
+	return exitOK
+}
+
+func printServeHelp(w io.Writer) {
+	fmt.Fprint(w, `Usage:
+  distributor serve --config <path>
+
+Options:
+  --config <path>  Path to config file
+
+Serve loads configured HTTP upload sources, resolves upload tokens through the
+configured secret environment, and starts the HTTP upload API.
+`)
+}

internal/cli/source_mode.go

@@ -0,0 +1,65 @@
+package cli
+
+import (
+	"fmt"
+	"io"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/app"
+)
+
+type sourceDiagnosticArgs struct {
+	Path         string
+	ConfigPath   string
+	PipelineID   string
+	BundlePath   string
+	OutputFormat app.OutputFormat
+}
+
+func parseSourceDiagnosticArgs(stderr io.Writer, command string, args []string) (sourceDiagnosticArgs, bool) {
+	flags := newFlagSet(command, stderr)
+	configPath := flags.String("config", "", "path to config file")
+	pipelineID := flags.String("pipeline", "", "pipeline id")
+	bundlePath := flags.String("bundle", "", "source-root-relative bundle path")
+	formatFlag := addFormatFlag(flags)
+	if err := flags.Parse(args); err != nil {
+		return sourceDiagnosticArgs{}, false
+	}
+	format, ok := parseOutputFormat(stderr, command, *formatFlag)
+	if !ok {
+		return sourceDiagnosticArgs{}, false
+	}
+	path, ok := parseOptionalPathArg(stderr, command, flags.Args())
+	if !ok {
+		return sourceDiagnosticArgs{}, false
+	}
+	if !validateInspectModeOK(stderr, command, path, *configPath, *pipelineID, *bundlePath) {
+		return sourceDiagnosticArgs{}, false
+	}
+	return sourceDiagnosticArgs{
+		Path:         path,
+		ConfigPath:   *configPath,
+		PipelineID:   *pipelineID,
+		BundlePath:   *bundlePath,
+		OutputFormat: format,
+	}, true
+}
+
+func validateInspectModeOK(stderr io.Writer, command, path, configPath, pipelineID, bundlePath string) bool {
+	configMode := configPath != "" || pipelineID != "" || bundlePath != ""
+	if !configMode {
+		return true
+	}
+	if path != "" {
+		fmt.Fprintf(stderr, "distributor: %s does not accept a local path with --config, --pipeline, or --bundle\n", command)
+		return false
+	}
+	if configPath == "" {
+		fmt.Fprintf(stderr, "distributor: %s requires --config when --pipeline or --bundle is set\n", command)
+		return false
+	}
+	if pipelineID == "" {
+		fmt.Fprintf(stderr, "distributor: %s requires --pipeline in config mode\n", command)
+		return false
+	}
+	return true
+}

internal/cli/validate.go

@@ -13,11 +13,18 @@ func validateCommand(ctx context.Context, args []string, stdout, stderr io.Write
 		printValidateHelp(stdout)
 		return exitOK
 	}
-	path, ok := parseOptionalPathArg(stderr, "validate", args)
+	parsed, ok := parseSourceDiagnosticArgs(stderr, "validate", args)
 	if !ok {
 		return exitUsage
 	}
-	if err := app.Validate(ctx, app.ValidateOptions{Path: path, Stdout: stdout}); err != nil {
+	if err := app.Validate(ctx, app.ValidateOptions{
+		Path:         parsed.Path,
+		ConfigPath:   parsed.ConfigPath,
+		PipelineID:   parsed.PipelineID,
+		BundlePath:   parsed.BundlePath,
+		Stdout:       stdout,
+		OutputFormat: parsed.OutputFormat,
+	}); err != nil {
 		return fail(stderr, err)
 	}
 	return exitOK
@@ -25,8 +32,16 @@ func validateCommand(ctx context.Context, args []string, stdout, stderr io.Write
 
 func printValidateHelp(w io.Writer) {
 	fmt.Fprint(w, `Usage:
-  distributor validate <path>
+  distributor validate [--format text|json] <path>
+  distributor validate --config <path> --pipeline <id> [--bundle <path>] [--format text|json]
 
-Validate a local source bundle directory or a tree containing source bundles.
+Options:
+  --config <path>     Path to config file for configured source validation
+  --pipeline <id>     Pipeline id to validate in config mode
+  --bundle <path>     Source-root-relative bundle path to validate
+  --format text|json  Output format
+
+Validate a local source bundle directory, a local source bundle tree, or a
+configured pipeline source.
 `)
 }

internal/cli/version.go

@@ -13,16 +13,43 @@ func versionCommand(_ context.Context, args []string, stdout, stderr io.Writer)
 		printVersionHelp(stdout)
 		return exitOK
 	}
-	if rejectExtraArgs(stderr, "version", args) {
+	flags := newFlagSet("version", stderr)
+	formatFlag := addFormatFlag(flags)
+	if err := flags.Parse(args); err != nil {
 		return exitUsage
 	}
+	if rejectExtraArgs(stderr, "version", flags.Args()) {
+		return exitUsage
+	}
+	format, ok := parseOutputFormat(stderr, "version", *formatFlag)
+	if !ok {
+		return exitUsage
+	}
+	if app.IsJSONOutput(format) {
+		err := app.WriteJSONEnvelope(stdout, "version", true, nil, versionResult{
+			Application: app.Name,
+			Version:     app.Version,
+		}, nil)
+		if err != nil {
+			return fail(stderr, err)
+		}
+		return exitOK
+	}
 	fmt.Fprintln(stdout, app.VersionString())
 	return exitOK
 }
 
+type versionResult struct {
+	Application string `json:"application"`
+	Version     string `json:"version"`
+}
+
 func printVersionHelp(w io.Writer) {
 	fmt.Fprint(w, `Usage:
-  distributor version
+  distributor version [--format text|json]
+
+Options:
+  --format text|json  Output format
 
 Print version information.
 `)

internal/config/backend_view.go

@@ -0,0 +1,50 @@
+package config
+
+type backendView struct {
+	Backend   string
+	Host      string
+	User      string
+	Port      int
+	Path      string
+	Endpoint  string
+	Bucket    string
+	Prefix    string
+	Region    string
+	ForcePath *bool
+	Creds     Credentials
+	SSH       SSH
+}
+
+func backendViewFromSource(source Backend) backendView {
+	return backendView{
+		Backend:   source.Backend,
+		Host:      source.Host,
+		User:      source.User,
+		Port:      source.Port,
+		Path:      source.Path,
+		Endpoint:  source.Endpoint,
+		Bucket:    source.Bucket,
+		Prefix:    source.Prefix,
+		Region:    source.Region,
+		ForcePath: source.ForcePath,
+		Creds:     source.Creds,
+		SSH:       source.SSH,
+	}
+}
+
+func backendViewFromDestination(destination Destination) backendView {
+	return backendView{
+		Backend:   destination.Backend,
+		Host:      destination.Host,
+		User:      destination.User,
+		Port:      destination.Port,
+		Path:      destination.Path,
+		Endpoint:  destination.Endpoint,
+		Bucket:    destination.Bucket,
+		Prefix:    destination.Prefix,
+		Region:    destination.Region,
+		ForcePath: destination.ForcePath,
+		Creds:     destination.Creds,
+		SSH:       destination.SSH,
+	}
+}

internal/config/backend_view_test.go

@@ -0,0 +1,187 @@
+package config
+
+import "testing"
+
+func TestBackendViewsPreserveEquivalentStorageFields(t *testing.T) {
+	forcePathStyle := false
+	source := Backend{
+		Backend:   BackendS3,
+		Host:      "storage.example.com",
+		User:      "reports",
+		Port:      2222,
+		Path:      "/reports",
+		Endpoint:  "https://s3.example.com",
+		Bucket:    "source",
+		Prefix:    "incoming",
+		Region:    "us-west-2",
+		ForcePath: &forcePathStyle,
+		Creds: Credentials{
+			AccessKeyIDEnv:     "ACCESS_KEY_ID",
+			SecretAccessKeyEnv: "SECRET_ACCESS_KEY",
+		},
+		SSH: SSH{
+			KeyFile:       "/home/reports/.ssh/id_ed25519",
+			KnownHosts:    "/home/reports/.ssh/known_hosts",
+			HostKeyPolicy: HostKeyPolicyStrict,
+		},
+	}
+	destination := Destination{
+		Backend:   source.Backend,
+		Host:      source.Host,
+		User:      source.User,
+		Port:      source.Port,
+		Path:      source.Path,
+		Endpoint:  source.Endpoint,
+		Bucket:    source.Bucket,
+		Prefix:    source.Prefix,
+		Region:    source.Region,
+		ForcePath: source.ForcePath,
+		Creds:     source.Creds,
+		SSH:       source.SSH,
+	}
+
+	sourceView := backendViewFromSource(source)
+	destinationView := backendViewFromDestination(destination)
+
+	if sourceView != destinationView {
+		t.Fatalf("source view = %#v, destination view = %#v, want equivalent storage fields", sourceView, destinationView)
+	}
+}
+
+func TestBackendViewValidationKeepsHTTPUploadSourceOnly(t *testing.T) {
+	cfg := Config{Pipelines: []Pipeline{{
+		ID: "reports",
+		Source: Backend{
+			Backend: BackendHTTPUpload,
+			Upload:  HTTPUpload{TokenEnv: "UPLOAD_TOKEN"},
+		},
+		Destinations: []Destination{{
+			ID:      "archive",
+			Backend: BackendHTTPUpload,
+		}},
+	}}}
+	ApplyDefaults(&cfg)
+
+	err := Validate(cfg)
+	if err == nil {
+		t.Fatal("Validate() error = nil, want destination http_upload error")
+	}
+	if got, want := err.Error(), "pipelines[0].destinations[0].backend http_upload is only supported for sources"; got != want {
+		t.Fatalf("Validate() error = %q, want %q", got, want)
+	}
+}
+
+func TestBackendViewValidationAppliesStorageRulesToSourcesAndDestinations(t *testing.T) {
+	forcePathStyle := false
+	tests := []struct {
+		name        string
+		source      Backend
+		destination Destination
+		wantErr     bool
+	}{
+		{
+			name: "local valid",
+			source: Backend{
+				Backend: BackendLocal,
+				Path:    "/source",
+			},
+			destination: Destination{
+				Backend: BackendLocal,
+				Path:    "/destination",
+			},
+		},
+		{
+			name: "local missing path",
+			source: Backend{
+				Backend: BackendLocal,
+			},
+			destination: Destination{
+				Backend: BackendLocal,
+			},
+			wantErr: true,
+		},
+		{
+			name: "ssh valid",
+			source: Backend{
+				Backend: BackendSSH,
+				Host:    "source.example.com",
+				Port:    22,
+				Path:    "/source",
+				SSH:     SSH{HostKeyPolicy: HostKeyPolicyAcceptNew},
+			},
+			destination: Destination{
+				Backend: BackendSSH,
+				Host:    "destination.example.com",
+				Port:    22,
+				Path:    "/destination",
+				SSH:     SSH{HostKeyPolicy: HostKeyPolicyAcceptNew},
+			},
+		},
+		{
+			name: "ssh missing host",
+			source: Backend{
+				Backend: BackendSSH,
+				Port:    22,
+				Path:    "/source",
+				SSH:     SSH{HostKeyPolicy: HostKeyPolicyAcceptNew},
+			},
+			destination: Destination{
+				Backend: BackendSSH,
+				Port:    22,
+				Path:    "/destination",
+				SSH:     SSH{HostKeyPolicy: HostKeyPolicyAcceptNew},
+			},
+			wantErr: true,
+		},
+		{
+			name: "s3 valid",
+			source: Backend{
+				Backend:   BackendS3,
+				Endpoint:  "https://s3.example.com",
+				Bucket:    "source",
+				Prefix:    "incoming",
+				Region:    DefaultS3Region,
+				ForcePath: &forcePathStyle,
+			},
+			destination: Destination{
+				Backend:   BackendS3,
+				Endpoint:  "https://s3.example.com",
+				Bucket:    "destination",
+				Prefix:    "archive",
+				Region:    DefaultS3Region,
+				ForcePath: &forcePathStyle,
+			},
+		},
+		{
+			name: "s3 partial credentials",
+			source: Backend{
+				Backend:  BackendS3,
+				Endpoint: "https://s3.example.com",
+				Bucket:   "source",
+				Region:   DefaultS3Region,
+				Creds:    Credentials{AccessKeyIDEnv: "ACCESS_KEY_ID"},
+			},
+			destination: Destination{
+				Backend:  BackendS3,
+				Endpoint: "https://s3.example.com",
+				Bucket:   "destination",
+				Region:   DefaultS3Region,
+				Creds:    Credentials{AccessKeyIDEnv: "ACCESS_KEY_ID"},
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sourceErrors := validateBackend(nil, "source", backendViewFromSource(tt.source))
+			destinationErrors := validateBackend(nil, "destination", backendViewFromDestination(tt.destination))
+			if got := len(sourceErrors) > 0; got != tt.wantErr {
+				t.Fatalf("source validation errors = %#v, wantErr %t", sourceErrors, tt.wantErr)
+			}
+			if got := len(destinationErrors) > 0; got != tt.wantErr {
+				t.Fatalf("destination validation errors = %#v, wantErr %t", destinationErrors, tt.wantErr)
+			}
+		})
+	}
+}

internal/config/config.go

@@ -1,9 +1,28 @@
 package config
 
 type Config struct {
+	Server    Server     `yaml:"server"`
+	Secrets   Secrets    `yaml:"secrets"`
 	Pipelines []Pipeline `yaml:"pipelines"`
 }
 
+type Server struct {
+	HTTP HTTPServer `yaml:"http"`
+}
+
+type HTTPServer struct {
+	Bind           string    `yaml:"bind"`
+	StagingRoot    string    `yaml:"staging_root"`
+	MaxUploadSize  *ByteSize `yaml:"max_upload_size"`
+	QueueSize      int       `yaml:"queue_size"`
+	MaxConcurrency int       `yaml:"max_concurrency"`
+	Retention      *Duration `yaml:"retention"`
+}
+
+type Secrets struct {
+	Directory string `yaml:"directory"`
+}
+
 type Pipeline struct {
 	ID           string           `yaml:"id"`
 	Source       Backend          `yaml:"source"`
@@ -14,29 +33,50 @@ type Pipeline struct {
 type Destination struct {
 	ID        string         `yaml:"id"`
 	Backend   string         `yaml:"backend"`
+	Host      string         `yaml:"host"`
+	User      string         `yaml:"user"`
+	Port      int            `yaml:"port"`
 	Path      string         `yaml:"path"`
-	URI       string         `yaml:"uri"`
 	Endpoint  string         `yaml:"endpoint"`
 	Bucket    string         `yaml:"bucket"`
 	Prefix    string         `yaml:"prefix"`
 	Region    string         `yaml:"region"`
-	ForcePath bool           `yaml:"force_path_style"`
+	ForcePath *bool          `yaml:"force_path_style"`
 	Creds     Credentials    `yaml:"credentials"`
+	SSH       SSH            `yaml:",inline"`
 	Publish   *PublishPolicy `yaml:"publish"`
 	Transform Transform      `yaml:"transform"`
+	PathMap   PathMapping    `yaml:"path_mapping"`
+	Links     *Links         `yaml:"links"`
 	Transfer  TransferPolicy `yaml:"transfer"`
 }
 
 type Backend struct {
 	Backend   string      `yaml:"backend"`
+	Host      string      `yaml:"host"`
+	User      string      `yaml:"user"`
+	Port      int         `yaml:"port"`
 	Path      string      `yaml:"path"`
-	URI       string      `yaml:"uri"`
 	Endpoint  string      `yaml:"endpoint"`
 	Bucket    string      `yaml:"bucket"`
 	Prefix    string      `yaml:"prefix"`
 	Region    string      `yaml:"region"`
-	ForcePath bool        `yaml:"force_path_style"`
+	ForcePath *bool       `yaml:"force_path_style"`
 	Creds     Credentials `yaml:"credentials"`
+	SSH       SSH         `yaml:",inline"`
+	Upload    HTTPUpload  `yaml:",inline"`
+}
+
+type HTTPUpload struct {
+	TokenEnv      string    `yaml:"token_env"`
+	StagingPath   string    `yaml:"staging_path"`
+	MaxUploadSize *ByteSize `yaml:"max_upload_size"`
+}
+
+type SSH struct {
+	KeyFile       string        `yaml:"ssh_key_file"`
+	KnownHosts    string        `yaml:"known_hosts"`
+	HostKeyPolicy HostKeyPolicy `yaml:"host_key_policy"`
 }
 
 type Credentials struct {
@@ -60,6 +100,16 @@ type Transform struct {
 type MarkdownToHTML struct {
 	Enabled bool   `yaml:"enabled"`
 	Mode    string `yaml:"mode"`
+	Input   string `yaml:"input"`
+}
+
+type PathMapping struct {
+	Mode string `yaml:"mode"`
+}
+
+type Links struct {
+	BaseURL string `yaml:"base_url"`
+	Primary string `yaml:"primary"`
 }
 
 type TransferPolicy struct {

internal/config/defaults.go

@@ -1,11 +1,19 @@
 package config
 
+import (
+	"path/filepath"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/transform"
+)
+
 const DefaultConfigPath = "/usr/local/etc/distributor/config.yml"
 
 const (
-	BackendLocal = "local"
-	BackendSSH   = "ssh"
-	BackendS3    = "s3"
+	BackendLocal      = "local"
+	BackendSSH        = "ssh"
+	BackendS3         = "s3"
+	BackendHTTPUpload = "http_upload"
 )
 
 const (
@@ -19,20 +27,58 @@ const (
 )
 
 const (
-	TransformModeSidecar = "sidecar"
+	TransformModeSidecar = transform.MarkdownModeSidecar
+	TransformModeIndex   = transform.MarkdownModeIndex
+)
+
+const (
+	PathMappingPreserveRelative = "preserve_relative"
+	PathMappingFixed            = "fixed"
+)
+
+const (
+	LinkPrimaryAuto   = "auto"
+	LinkPrimaryHTML   = "html"
+	LinkPrimarySource = "source"
+)
+
+const DefaultS3Region = "us-east-1"
+
+const (
+	DefaultHTTPBind           = "127.0.0.1:8080"
+	DefaultHTTPStagingRoot    = "/var/spool/distributor"
+	DefaultHTTPMaxUploadSize  = ByteSize(20 * 1024 * 1024)
+	DefaultHTTPQueueSize      = 16
+	DefaultHTTPMaxConcurrency = 1
+	DefaultHTTPRetention      = Duration(24 * time.Hour)
 )
 
 func ApplyDefaults(cfg *Config) {
+	applyHTTPServerDefaults(&cfg.Server.HTTP)
 	for pipelineIndex := range cfg.Pipelines {
 		pipeline := &cfg.Pipelines[pipelineIndex]
+		applyBackendDefaults(&pipeline.Source)
+		if pipeline.Source.Backend == BackendHTTPUpload {
+			applyHTTPUploadDefaults(&pipeline.Source.Upload, pipeline.ID, cfg.Server.HTTP)
+		}
 		if pipeline.Validation.OnDigestMismatch == "" {
 			pipeline.Validation.OnDigestMismatch = ValidationActionFail
 		}
 		for destinationIndex := range pipeline.Destinations {
 			destination := &pipeline.Destinations[destinationIndex]
+			applyDestinationDefaults(destination)
 			if destination.Publish == nil {
 				destination.Publish = &PublishPolicy{Source: true}
 			}
+			if destination.Transform.MarkdownToHTML != nil && destination.Transform.MarkdownToHTML.Mode == "" {
+				destination.Transform.MarkdownToHTML.Mode = TransformModeSidecar
+			}
+			if destination.PathMap.Mode == "" {
+				destination.PathMap.Mode = PathMappingPreserveRelative
+			}
+			if destination.Links != nil && destination.Links.Primary == "" {
+				destination.Links.Primary = LinkPrimaryAuto
+			}
 			if destination.Transfer.OnDestinationSame == "" {
 				destination.Transfer.OnDestinationSame = TransferActionSkip
 			}
@@ -48,3 +94,74 @@ func ApplyDefaults(cfg *Config) {
 		}
 	}
 }
+
+func applyHTTPServerDefaults(server *HTTPServer) {
+	if server.Bind == "" {
+		server.Bind = DefaultHTTPBind
+	}
+	if server.StagingRoot == "" {
+		server.StagingRoot = DefaultHTTPStagingRoot
+	}
+	if server.MaxUploadSize == nil {
+		server.MaxUploadSize = byteSize(DefaultHTTPMaxUploadSize)
+	}
+	if server.QueueSize == 0 {
+		server.QueueSize = DefaultHTTPQueueSize
+	}
+	if server.MaxConcurrency == 0 {
+		server.MaxConcurrency = DefaultHTTPMaxConcurrency
+	}
+	if server.Retention == nil {
+		server.Retention = duration(DefaultHTTPRetention)
+	}
+}
+
+func applyHTTPUploadDefaults(upload *HTTPUpload, pipelineID string, server HTTPServer) {
+	if upload.StagingPath == "" && pipelineID != "" {
+		upload.StagingPath = filepath.Join(server.StagingRoot, pipelineID)
+	}
+	if upload.MaxUploadSize == nil && server.MaxUploadSize != nil {
+		upload.MaxUploadSize = byteSize(*server.MaxUploadSize)
+	}
+}
+
+func byteSize(value ByteSize) *ByteSize {
+	return &value
+}
+
+func duration(value Duration) *Duration {
+	return &value
+}
+
+func applyBackendDefaults(backend *Backend) {
+	applyStorageBackendDefaults(backend.Backend, &backend.Port, &backend.SSH, &backend.Region, &backend.Prefix, &backend.ForcePath)
+}
+
+func applyDestinationDefaults(destination *Destination) {
+	applyStorageBackendDefaults(destination.Backend, &destination.Port, &destination.SSH, &destination.Region, &destination.Prefix, &destination.ForcePath)
+}
+
+func applyStorageBackendDefaults(backend string, port *int, ssh *SSH, region, prefix *string, forcePath **bool) {
+	if backend == BackendSSH {
+		if *port == 0 {
+			*port = 22
+		}
+		if ssh.HostKeyPolicy == "" {
+			ssh.HostKeyPolicy = HostKeyPolicyAcceptNew
+		}
+	}
+	if backend == BackendS3 {
+		applyS3Defaults(region, prefix, forcePath)
+	}
+}
+
+func applyS3Defaults(region, prefix *string, forcePath **bool) {
+	if *region == "" {
+		*region = DefaultS3Region
+	}
+	*prefix = NormalizeS3Prefix(*prefix)
+	if *forcePath == nil {
+		defaultForcePath := true
+		*forcePath = &defaultForcePath
+	}
+}

internal/config/load_test.go

@@ -33,6 +33,29 @@ pipelines:
 	if got, want := destination.Transfer.OnDestinationOlder, TransferActionReplace; got != want {
 		t.Fatalf("transfer default = %q, want %q", got, want)
 	}
+	if cfg.Secrets.Directory != "" {
+		t.Fatalf("secrets.directory = %q, want empty", cfg.Secrets.Directory)
+	}
+}
+
+func TestLoadFileValidSecretsDirectoryConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+secrets:
+  directory: /run/secrets/distributor
+pipelines:
+  - id: local-copy
+    source:
+      backend: local
+      path: /var/spool/reports
+    destinations:
+      - id: archive
+        backend: local
+        path: /srv/archive
+`)
+
+	if got, want := cfg.Secrets.Directory, "/run/secrets/distributor"; got != want {
+		t.Fatalf("secrets.directory = %q, want %q", got, want)
+	}
 }
 
 func TestLoadFileValidFanOutConfig(t *testing.T) {
@@ -53,7 +76,9 @@ pipelines:
           html: false
       - id: static-site
         backend: ssh
-        uri: ssh://deploy@example.com:22
+        host: example.com
+        user: deploy
+        port: 22
         path: /srv/www/reports
         publish:
           source: false
@@ -69,6 +94,237 @@ pipelines:
 	}
 }
 
+func TestLoadFileValidMarkdownIndexConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: static-site
+    source:
+      backend: local
+      path: /var/spool/reports
+    destinations:
+      - id: web
+        backend: local
+        path: /srv/www/reports
+        publish:
+          source: false
+          html: true
+        transform:
+          markdown_to_html:
+            enabled: true
+            mode: index
+            input: report.md
+`)
+
+	markdown := cfg.Pipelines[0].Destinations[0].Transform.MarkdownToHTML
+	if markdown == nil || markdown.Mode != TransformModeIndex || markdown.Input != "report.md" {
+		t.Fatalf("markdown config = %#v, want index input", markdown)
+	}
+}
+
+func TestLoadFileDefaultsMarkdownModeToSidecar(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: static-site
+    source:
+      backend: local
+      path: /var/spool/reports
+    destinations:
+      - id: web
+        backend: local
+        path: /srv/www/reports
+        publish:
+          source: false
+          html: true
+        transform:
+          markdown_to_html:
+            enabled: true
+`)
+
+	markdown := cfg.Pipelines[0].Destinations[0].Transform.MarkdownToHTML
+	if markdown == nil || markdown.Mode != TransformModeSidecar {
+		t.Fatalf("markdown mode = %#v, want sidecar default", markdown)
+	}
+}
+
+func TestLoadFileDefaultsPathMappingToPreserveRelative(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: archive
+        backend: local
+        path: /destination
+`)
+
+	if got, want := cfg.Pipelines[0].Destinations[0].PathMap.Mode, PathMappingPreserveRelative; got != want {
+		t.Fatalf("path mapping mode = %q, want %q", got, want)
+	}
+}
+
+func TestLoadFileAcceptsFixedPathMapping(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: latest
+        backend: local
+        path: /destination/latest
+        path_mapping:
+          mode: fixed
+`)
+
+	if got, want := cfg.Pipelines[0].Destinations[0].PathMap.Mode, PathMappingFixed; got != want {
+		t.Fatalf("path mapping mode = %q, want %q", got, want)
+	}
+}
+
+func TestLoadFileDefaultsLinksPrimaryToAuto(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: web
+        backend: local
+        path: /destination
+        links:
+          base_url: https://reports.example.com/archive
+`)
+
+	links := cfg.Pipelines[0].Destinations[0].Links
+	if links == nil {
+		t.Fatal("links = nil, want config")
+	}
+	if links.BaseURL != "https://reports.example.com/archive" || links.Primary != LinkPrimaryAuto {
+		t.Fatalf("links = %#v, want base URL with auto primary", links)
+	}
+}
+
+func TestLoadFileDefaultsHTTPServerConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`)
+
+	server := cfg.Server.HTTP
+	if got, want := server.Bind, DefaultHTTPBind; got != want {
+		t.Fatalf("server.http.bind = %q, want %q", got, want)
+	}
+	if got, want := server.StagingRoot, DefaultHTTPStagingRoot; got != want {
+		t.Fatalf("server.http.staging_root = %q, want %q", got, want)
+	}
+	if got, want := *server.MaxUploadSize, DefaultHTTPMaxUploadSize; got != want {
+		t.Fatalf("server.http.max_upload_size = %s, want %s", got, want)
+	}
+	if got, want := server.QueueSize, DefaultHTTPQueueSize; got != want {
+		t.Fatalf("server.http.queue_size = %d, want %d", got, want)
+	}
+	if got, want := server.MaxConcurrency, DefaultHTTPMaxConcurrency; got != want {
+		t.Fatalf("server.http.max_concurrency = %d, want %d", got, want)
+	}
+	if got, want := *server.Retention, DefaultHTTPRetention; got != want {
+		t.Fatalf("server.http.retention = %s, want %s", got, want)
+	}
+}
+
+func TestLoadFileAcceptsHTTPUploadSourceConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+server:
+  http:
+    bind: 127.0.0.1:9090
+    staging_root: /srv/distributor/staging
+    max_upload_size: 64MB
+    queue_size: 32
+    max_concurrency: 2
+    retention: 48h
+pipelines:
+  - id: weather-daily
+    source:
+      backend: http_upload
+      token_env: WEATHER_DAILY_UPLOAD_TOKEN
+      staging_path: /srv/distributor/staging/weather-daily
+      max_upload_size: 32MB
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`)
+
+	server := cfg.Server.HTTP
+	if got, want := server.Bind, "127.0.0.1:9090"; got != want {
+		t.Fatalf("server.http.bind = %q, want %q", got, want)
+	}
+	if got, want := server.StagingRoot, "/srv/distributor/staging"; got != want {
+		t.Fatalf("server.http.staging_root = %q, want %q", got, want)
+	}
+	if got, want := *server.MaxUploadSize, ByteSize(64*1024*1024); got != want {
+		t.Fatalf("server.http.max_upload_size = %s, want %s", got, want)
+	}
+	if got, want := server.QueueSize, 32; got != want {
+		t.Fatalf("server.http.queue_size = %d, want %d", got, want)
+	}
+	if got, want := server.MaxConcurrency, 2; got != want {
+		t.Fatalf("server.http.max_concurrency = %d, want %d", got, want)
+	}
+	if got, want := server.Retention.String(), "48h0m0s"; got != want {
+		t.Fatalf("server.http.retention = %s, want %s", got, want)
+	}
+
+	source := cfg.Pipelines[0].Source
+	if got, want := source.Backend, BackendHTTPUpload; got != want {
+		t.Fatalf("source.backend = %q, want %q", got, want)
+	}
+	if got, want := source.Upload.TokenEnv, "WEATHER_DAILY_UPLOAD_TOKEN"; got != want {
+		t.Fatalf("source.token_env = %q, want %q", got, want)
+	}
+	if got, want := source.Upload.StagingPath, "/srv/distributor/staging/weather-daily"; got != want {
+		t.Fatalf("source.staging_path = %q, want %q", got, want)
+	}
+	if got, want := *source.Upload.MaxUploadSize, ByteSize(32*1024*1024); got != want {
+		t.Fatalf("source.max_upload_size = %s, want %s", got, want)
+	}
+}
+
+func TestLoadFileDefaultsHTTPUploadSourceConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+server:
+  http:
+    max_upload_size: 12MB
+pipelines:
+  - id: weather-daily
+    source:
+      backend: http_upload
+      token_env: WEATHER_DAILY_UPLOAD_TOKEN
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`)
+
+	source := cfg.Pipelines[0].Source
+	if got, want := source.Upload.StagingPath, "/var/spool/distributor/weather-daily"; got != want {
+		t.Fatalf("source.staging_path = %q, want %q", got, want)
+	}
+	if got, want := *source.Upload.MaxUploadSize, ByteSize(12*1024*1024); got != want {
+		t.Fatalf("source.max_upload_size = %s, want %s", got, want)
+	}
+}
+
 func TestLoadFileValidBackendConfigs(t *testing.T) {
 	tests := map[string]string{
 		"local": `
@@ -87,13 +343,19 @@ pipelines:
   - id: ssh-backend
     source:
       backend: ssh
-      uri: ssh://reports@example.com:22
+      host: source.example.com
+      user: reports
       path: /source
     destinations:
       - id: ssh-destination
         backend: ssh
-        uri: ssh://deploy@example.com:22
+        host: destination.example.com
+        user: deploy
+        port: 2222
         path: /destination
+        ssh_key_file: /home/deploy/.ssh/id_ed25519
+        known_hosts: /home/deploy/.ssh/known_hosts
+        host_key_policy: strict
 `,
 		"s3": `
 pipelines:
@@ -124,6 +386,61 @@ pipelines:
 	}
 }
 
+func TestLoadFileDefaultsS3Config(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: s3-defaults
+    source:
+      backend: s3
+      endpoint: http://127.0.0.1:9000
+      bucket: source
+      prefix: /incoming/reports/
+    destinations:
+      - id: archive
+        backend: s3
+        endpoint: http://127.0.0.1:9000
+        bucket: destination
+`)
+
+	source := cfg.Pipelines[0].Source
+	if got, want := source.Region, DefaultS3Region; got != want {
+		t.Fatalf("source region = %q, want %q", got, want)
+	}
+	if got, want := source.Prefix, "incoming/reports"; got != want {
+		t.Fatalf("source prefix = %q, want %q", got, want)
+	}
+	if !ForcePathStyle(source.ForcePath) {
+		t.Fatal("source force_path_style = false, want true")
+	}
+	destination := cfg.Pipelines[0].Destinations[0]
+	if got, want := destination.Region, DefaultS3Region; got != want {
+		t.Fatalf("destination region = %q, want %q", got, want)
+	}
+	if !ForcePathStyle(destination.ForcePath) {
+		t.Fatal("destination force_path_style = false, want true")
+	}
+}
+
+func TestLoadFilePreservesExplicitS3ForcePathStyleFalse(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: s3-force-path
+    source:
+      backend: s3
+      endpoint: https://s3.example.com
+      bucket: source
+      force_path_style: false
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`)
+
+	if ForcePathStyle(cfg.Pipelines[0].Source.ForcePath) {
+		t.Fatal("force_path_style = true, want explicit false")
+	}
+}
+
 func TestLoadFileRejectsDuplicatePipelineIDs(t *testing.T) {
 	assertLoadError(t, `
 pipelines:
@@ -171,7 +488,7 @@ func TestLoadFileRejectsMissingRequiredFields(t *testing.T) {
 		"destinations":    `pipelines: [{id: reports, source: {backend: local, path: /source}}]`,
 		"destination id":  `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{backend: local, path: /archive}]}]`,
 		"local path":      `pipelines: [{id: reports, source: {backend: local}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
-		"ssh uri":         `pipelines: [{id: reports, source: {backend: ssh, path: /source}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"ssh host":        `pipelines: [{id: reports, source: {backend: ssh, path: /source}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
 		"s3 bucket":       `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com"}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
 		"publish outputs": `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{id: archive, backend: local, path: /archive, publish: {source: false, html: false}}]}]`,
 	}
@@ -183,6 +500,121 @@ func TestLoadFileRejectsMissingRequiredFields(t *testing.T) {
 	}
 }
 
+func TestLoadFileRejectsInvalidS3Config(t *testing.T) {
+	tests := map[string]string{
+		"prefix traversal": `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com", bucket: source, prefix: "../reports"}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"prefix backslash": `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com", bucket: source, prefix: 'a\b'}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"partial creds":    `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com", bucket: source, credentials: {access_key_id_env: ACCESS_KEY_ID}}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+	}
+	for name, body := range tests {
+		t.Run(name, func(t *testing.T) {
+			assertLoadError(t, body, "")
+		})
+	}
+}
+
+func TestLoadFileRejectsInvalidHTTPUploadConfig(t *testing.T) {
+	tests := map[string]string{
+		"server size":             `server: {http: {max_upload_size: 20XB}}`,
+		"source size":             `pipelines: [{id: reports, source: {backend: http_upload, token_env: UPLOAD_TOKEN, max_upload_size: 20XB}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"zero source size":        `pipelines: [{id: reports, source: {backend: http_upload, token_env: UPLOAD_TOKEN, max_upload_size: 0B}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"server duration":         `server: {http: {retention: forever}}`,
+		"zero server duration":    `server: {http: {retention: 0s}}`,
+		"missing token env":       `pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"destination http upload": `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{id: ingest, backend: http_upload}]}]`,
+		"literal token":           `pipelines: [{id: reports, source: {backend: http_upload, token: secret, token_env: UPLOAD_TOKEN}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+		"unknown server field":    `server: {http: {surprise: true}}`,
+		"unknown source field":    `pipelines: [{id: reports, source: {backend: http_upload, token_env: UPLOAD_TOKEN, surprise: true}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
+	}
+	for name, body := range tests {
+		t.Run(name, func(t *testing.T) {
+			assertLoadError(t, body, "")
+		})
+	}
+}
+
+func TestLoadFileDefaultsSSHConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: ssh-defaults
+    source:
+      backend: ssh
+      host: source.example.com
+      path: /source
+    destinations:
+      - id: archive
+        backend: ssh
+        host: destination.example.com
+        path: /archive
+        host_key_policy: false
+`)
+
+	source := cfg.Pipelines[0].Source
+	if source.Port != 22 {
+		t.Fatalf("source port = %d, want 22", source.Port)
+	}
+	if source.SSH.HostKeyPolicy != HostKeyPolicyAcceptNew {
+		t.Fatalf("source host key policy = %q, want accept-new", source.SSH.HostKeyPolicy)
+	}
+	destination := cfg.Pipelines[0].Destinations[0]
+	if destination.Port != 22 {
+		t.Fatalf("destination port = %d, want 22", destination.Port)
+	}
+	if destination.SSH.HostKeyPolicy != HostKeyPolicyOff {
+		t.Fatalf("destination host key policy = %q, want off", destination.SSH.HostKeyPolicy)
+	}
+}
+
+func TestLoadFileNormalizesSSHHostKeyPolicies(t *testing.T) {
+	tests := map[string]HostKeyPolicy{
+		`true`:         HostKeyPolicyStrict,
+		`"true"`:       HostKeyPolicyStrict,
+		`strict`:       HostKeyPolicyStrict,
+		`accept-new`:   HostKeyPolicyAcceptNew,
+		`false`:        HostKeyPolicyOff,
+		`"false"`:      HostKeyPolicyOff,
+		`off`:          HostKeyPolicyOff,
+		`"STRICT"`:     HostKeyPolicyStrict,
+		`"ACCEPT-NEW"`: HostKeyPolicyAcceptNew,
+		`"OFF"`:        HostKeyPolicyOff,
+	}
+	for value, want := range tests {
+		t.Run(value, func(t *testing.T) {
+			cfg := loadConfig(t, `
+pipelines:
+  - id: ssh-policy
+    source:
+      backend: ssh
+      host: source.example.com
+      path: /source
+      host_key_policy: `+value+`
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`)
+			if got := cfg.Pipelines[0].Source.SSH.HostKeyPolicy; got != want {
+				t.Fatalf("host key policy = %q, want %q", got, want)
+			}
+		})
+	}
+}
+
+func TestLoadFileRejectsLegacySSHURIFieldAsUnknown(t *testing.T) {
+	assertLoadError(t, `
+pipelines:
+  - id: reports
+    source:
+      backend: ssh
+      uri: ssh://reports@example.com:22
+      path: /source
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`, "field uri not found")
+}
+
 func TestLoadFileRejectsUnsupportedBackend(t *testing.T) {
 	assertLoadError(t, `
 pipelines:
@@ -261,12 +693,34 @@ pipelines:
 `, "field surprise not found")
 }
 
+func TestLoadFileRejectsUnknownSecretsFields(t *testing.T) {
+	assertLoadError(t, `
+secrets:
+  directory: /run/secrets/distributor
+  surprise: true
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`, "field surprise not found")
+}
+
 func TestExampleConfigsLoad(t *testing.T) {
 	for _, path := range []string{
 		"../../examples/local-to-local.yml",
 		"../../examples/local-publish.yml",
 		"../../examples/local-html.yml",
+		"../../examples/local-index.yml",
 		"../../examples/fan-out.yml",
+		"../../examples/archive-and-latest.yml",
+		"../../examples/http-upload-local.yml",
+		"../../examples/ssh-destination.yml",
+		"../../examples/s3-destination.yml",
 	} {
 		t.Run(path, func(t *testing.T) {
 			if _, err := LoadFile(path); err != nil {

internal/config/quantity.go

@@ -0,0 +1,117 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"gopkg.in/yaml.v3"
+)
+
+type ByteSize int64
+
+type Duration time.Duration
+
+func (size *ByteSize) UnmarshalYAML(value *yaml.Node) error {
+	if value.Kind != yaml.ScalarNode || value.Tag != "!!str" {
+		return fmt.Errorf("size must be a string with B, KB, MB, or GB suffix")
+	}
+
+	var raw string
+	if err := value.Decode(&raw); err != nil {
+		return err
+	}
+	parsed, err := ParseByteSize(raw)
+	if err != nil {
+		return err
+	}
+	*size = parsed
+	return nil
+}
+
+func (size ByteSize) String() string {
+	value := int64(size)
+	if value == 0 {
+		return "0B"
+	}
+	units := []struct {
+		suffix     string
+		multiplier int64
+	}{
+		{suffix: "GB", multiplier: 1024 * 1024 * 1024},
+		{suffix: "MB", multiplier: 1024 * 1024},
+		{suffix: "KB", multiplier: 1024},
+		{suffix: "B", multiplier: 1},
+	}
+	for _, unit := range units {
+		if value%unit.multiplier == 0 {
+			return strconv.FormatInt(value/unit.multiplier, 10) + unit.suffix
+		}
+	}
+	return strconv.FormatInt(value, 10) + "B"
+}
+
+func ParseByteSize(raw string) (ByteSize, error) {
+	value := strings.TrimSpace(raw)
+	if value == "" {
+		return 0, fmt.Errorf("size is required")
+	}
+
+	units := []struct {
+		suffix     string
+		multiplier int64
+	}{
+		{suffix: "GB", multiplier: 1024 * 1024 * 1024},
+		{suffix: "MB", multiplier: 1024 * 1024},
+		{suffix: "KB", multiplier: 1024},
+		{suffix: "B", multiplier: 1},
+	}
+	for _, unit := range units {
+		number, ok := strings.CutSuffix(value, unit.suffix)
+		if !ok {
+			continue
+		}
+		if strings.TrimSpace(number) != number || number == "" {
+			return 0, fmt.Errorf("size must be an integer followed by B, KB, MB, or GB")
+		}
+		parsed, err := strconv.ParseInt(number, 10, 64)
+		if err != nil {
+			return 0, fmt.Errorf("size must be an integer followed by B, KB, MB, or GB")
+		}
+		if parsed < 0 {
+			return 0, fmt.Errorf("size must be non-negative")
+		}
+		const maxInt64 = int64(1<<63 - 1)
+		if parsed > 0 && parsed > maxInt64/unit.multiplier {
+			return 0, fmt.Errorf("size is too large")
+		}
+		return ByteSize(parsed * unit.multiplier), nil
+	}
+	return 0, fmt.Errorf("size must use B, KB, MB, or GB suffix")
+}
+
+func (duration *Duration) UnmarshalYAML(value *yaml.Node) error {
+	if value.Kind != yaml.ScalarNode || value.Tag != "!!str" {
+		return fmt.Errorf("duration must be a string duration")
+	}
+
+	var raw string
+	if err := value.Decode(&raw); err != nil {
+		return err
+	}
+	parsed, err := time.ParseDuration(raw)
+	if err != nil {
+		return fmt.Errorf("duration must be a valid duration: %w", err)
+	}
+	*duration = Duration(parsed)
+	return nil
+}
+
+func (duration Duration) String() string {
+	return time.Duration(duration).String()
+}
+
+func (duration Duration) AsDuration() time.Duration {
+	return time.Duration(duration)
+}

internal/config/s3.go

@@ -0,0 +1,19 @@
+package config
+
+import (
+	"strings"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+func NormalizeS3Prefix(prefix string) string {
+	return strings.Trim(prefix, "/")
+}
+
+func ValidateS3Prefix(prefix string) error {
+	return storage.ValidatePrefix(prefix)
+}
+
+func ForcePathStyle(value *bool) bool {
+	return value == nil || *value
+}