Add support for label storage in local content store

Allows running tests which require labels on the content store

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

content/local/writer.go

@@ -56,6 +56,13 @@ func (w *writer) Write(p []byte) (n int, err error) {
 }
 
 func (w *writer) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error {
+	var base content.Info
+	for _, opt := range opts {
+		if err := opt(&base); err != nil {
+			return err
+		}
+	}
+
 	if w.fp == nil {
 		return errors.Wrap(errdefs.ErrFailedPrecondition, "cannot commit on closed writer")
 	}
@@ -123,6 +130,12 @@ func (w *writer) Commit(ctx context.Context, size int64, expected digest.Digest,
 	w.fp = nil
 	unlock(w.ref)
 
+	if w.s.ls != nil && base.Labels != nil {
+		if err := w.s.ls.Set(dgst, base.Labels); err != nil {
+			return err
+		}
+	}
+
 	return nil
 }