Expose managed output pruning

internal/app/prune.go

@@ -3,6 +3,7 @@ package app
 import (
 	"context"
 	"fmt"
+	"io"
 	"time"
 
 	"gitea.maximumdirect.net/eric/distributor/internal/config"
@@ -16,6 +17,8 @@ type PruneOptions struct {
 	DestinationID string
 	DryRun        bool
 	Now           time.Time
+	Stdout        io.Writer
+	OutputFormat  OutputFormat
 }
 
 type PrunePlanOptions struct {
@@ -63,6 +66,9 @@ type PruneOutputRecord struct {
 }
 
 func Prune(ctx context.Context, options PruneOptions) (PruneReport, error) {
+	if err := ValidateOutputFormat(options.OutputFormat); err != nil {
+		return PruneReport{}, err
+	}
 	if err := ctx.Err(); err != nil {
 		return PruneReport{}, err
 	}
@@ -106,7 +112,14 @@ func pruneSetupWithBackendFactory(ctx context.Context, setup runtimeSetup, optio
 	}
 	defer closeBackend(destinationBackend)
 
-	return executePrune(ctx, destinationBackend, pipeline, destination, options)
+	report, err := executePrune(ctx, destinationBackend, pipeline, destination, options)
+	if err != nil {
+		return report, err
+	}
+	if err := WritePruneReport(options.Stdout, options.OutputFormat, report); err != nil {
+		return PruneReport{}, err
+	}
+	return report, nil
 }
 
 func requirePruneScope(options PruneOptions) error {
@@ -292,3 +305,35 @@ func pruneOutputRecords(candidates []state.PruneCandidate) []PruneOutputRecord {
 	}
 	return records
 }
+
+func WritePruneReport(w io.Writer, format OutputFormat, report PruneReport) error {
+	if IsJSONOutput(format) {
+		return WriteJSONEnvelope(w, "prune", true, nil, report, nil)
+	}
+	return writePruneReportText(w, report)
+}
+
+func writePruneReportText(w io.Writer, report PruneReport) error {
+	if w == nil {
+		return nil
+	}
+	status := "unchanged"
+	if report.StateChanged {
+		status = "changed"
+	} else if report.WouldChange {
+		status = "would_change"
+	}
+	_, err := fmt.Fprintf(w, "Prune: pipeline=%s destination=%s backend=%s root=%s status=%s checked=%d planned=%d deleted=%d preserved=%d dry_run=%t\n",
+		report.PipelineID,
+		report.DestinationID,
+		report.Backend,
+		report.RootPath,
+		status,
+		report.CheckedCount,
+		len(report.PlannedOutputs),
+		len(report.DeletedOutputs),
+		len(report.PreservedOutputs),
+		report.DryRun,
+	)
+	return err
+}