Add local source publication

internal/publish/safety.go

@@ -0,0 +1,19 @@
+package publish
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+)
+
+func ensureDestinationEmpty(ctx context.Context, backend storage.Backend, bundlePath string) error {
+	hasAny, err := backend.HasAny(ctx, bundlePath)
+	if err != nil {
+		return err
+	}
+	if hasAny {
+		return fmt.Errorf("destination bundle path %q is not empty after managed cleanup", displayPath(bundlePath))
+	}
+	return nil
+}