Merge pull request #576 from stevvooe/seek-reset-handling

content: allow reset via Truncate

services/content/service.go

@@ -195,6 +195,8 @@ func (s *Service) Write(session api.Content_WriteServer) (err error) {
 	}
 
 	ctx = log.WithLogger(ctx, log.G(ctx).WithFields(fields))
+
+	log.G(ctx).Debug("(*Service).Write started")
 	// this action locks the writer for the session.
 	wr, err := s.store.Writer(ctx, ref, total, expected)
 	if err != nil {
@@ -266,6 +268,13 @@ func (s *Service) Write(session api.Content_WriteServer) (err error) {
 				}
 			}
 
+			if req.Offset == 0 && ws.Offset > 0 {
+				if err := wr.Truncate(req.Offset); err != nil {
+					return errors.Wrapf(err, "truncate failed")
+				}
+				msg.Offset = req.Offset
+			}
+
 			// issue the write if we actually have data.
 			if len(req.Data) > 0 {
 				// While this looks like we could use io.WriterAt here, because we