Add config loading and dry-run validation

internal/cli/root_test.go

@@ -3,6 +3,8 @@ package cli
 import (
 	"bytes"
 	"context"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 )
@@ -61,6 +63,38 @@ func TestPlaceholderCommandsFailClearly(t *testing.T) {
 	}
 }
 
+func TestExecuteRunDryRun(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "config.yml")
+	err := os.WriteFile(configPath, []byte(`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`), 0o600)
+	if err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--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(), "Configured pipelines: 1") {
+		t.Fatalf("stdout = %q, want config summary", stdout.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
 func TestUnknownCommandIsUsageError(t *testing.T) {
 	var stdout, stderr bytes.Buffer
 

internal/cli/run.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"context"
+	"flag"
 	"fmt"
 	"io"
 
@@ -13,11 +14,24 @@ func runCommand(ctx context.Context, args []string, stdout, stderr io.Writer) in
 		printRunHelp(stdout)
 		return exitOK
 	}
-	if len(args) > 0 {
-		fmt.Fprintf(stderr, "%s: run does not accept options yet: %v\n", app.Name, args)
+
+	flags := flag.NewFlagSet("run", flag.ContinueOnError)
+	flags.SetOutput(stderr)
+	configPath := flags.String("config", "", "path to config file")
+	dryRun := flags.Bool("dry-run", false, "load and validate config without publishing")
+	if err := flags.Parse(args); err != nil {
 		return exitUsage
 	}
-	if err := app.Run(ctx, app.RunOptions{}); err != nil {
+	if flags.NArg() > 0 {
+		fmt.Fprintf(stderr, "%s: run does not accept positional arguments: %v\n", app.Name, flags.Args())
+		return exitUsage
+	}
+
+	if err := app.Run(ctx, app.RunOptions{
+		ConfigPath: *configPath,
+		DryRun:     *dryRun,
+		Stdout:     stdout,
+	}); err != nil {
 		return fail(stderr, err)
 	}
 	return exitOK
@@ -25,8 +39,13 @@ func runCommand(ctx context.Context, args []string, stdout, stderr io.Writer) in
 
 func printRunHelp(w io.Writer) {
 	fmt.Fprint(w, `Usage:
-  distributor run
+  distributor run --config <path> --dry-run
 
-The run command is present but distribution behavior is not implemented yet.
+Options:
+  --config <path>  Path to config file
+  --dry-run        Load and validate config without publishing
+
+Execution behavior is not implemented yet. Dry-run currently prints a resolved
+configuration summary only.
 `)
 }