Abort newly created references on error

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

content/content.go

@@ -90,6 +90,7 @@ type IngestManager interface {
 // Writer handles the write of content into a content store
 type Writer interface {
 	// Close is expected to be called after Commit() when commission is needed.
+	// Closing a writer without commit allows resuming or aborting.
 	io.WriteCloser
 
 	// Digest may return empty digest or panics until committed.

content/local/writer.go

@@ -130,10 +130,10 @@ func (w *writer) Commit(ctx context.Context, size int64, expected digest.Digest,
 // tact.
 //
 // If one needs to resume the transaction, a new writer can be obtained from
-// `ContentStore.Resume` using the same key. The write can then be continued
+// `Ingester.Writer` using the same key. The write can then be continued
 // from it was left off.
 //
-// To abandon a transaction completely, first call close then `Store.Remove` to
+// To abandon a transaction completely, first call close then `IngestManager.Abort` to
 // clean up the associated resources.
 func (w *writer) Close() (err error) {
 	if w.fp != nil {