func (s *TagStore) pullImage(r *registry.Registry, out io.Writer, imgID, endpoint string, token []string, sf *utils.StreamFormatter) error { history, err := r.GetRemoteHistory(imgID, endpoint, token) if err != nil { return err } out.Write(sf.FormatProgress(utils.TruncateID(imgID), "Pulling dependent layers", nil)) // FIXME: Try to stream the images? // FIXME: Launch the getRemoteImage() in goroutines for i := len(history) - 1; i >= 0; i-- { id := history[i] // ensure no two downloads of the same layer happen at the same time if c, err := s.poolAdd("pull", "layer:"+id); err != nil { utils.Debugf("Image (id: %s) pull is already running, skipping: %v", id, err) <-c } defer s.poolRemove("pull", "layer:"+id) if !s.graph.Exists(id) { out.Write(sf.FormatProgress(utils.TruncateID(id), "Pulling metadata", nil)) var ( imgJSON []byte imgSize int err error img *image.Image ) retries := 5 for j := 1; j <= retries; j++ { imgJSON, imgSize, err = r.GetRemoteImageJSON(id, endpoint, token) if err != nil && j == retries { out.Write(sf.FormatProgress(utils.TruncateID(id), "Error pulling dependent layers", nil)) return err } else if err != nil { time.Sleep(time.Duration(j) * 500 * time.Millisecond) continue } img, err = image.NewImgJSON(imgJSON) if err != nil && j == retries { out.Write(sf.FormatProgress(utils.TruncateID(id), "Error pulling dependent layers", nil)) return fmt.Errorf("Failed to parse json: %s", err) } else if err != nil { time.Sleep(time.Duration(j) * 500 * time.Millisecond) continue } else { break } } for j := 1; j <= retries; j++ { // Get the layer status := "Pulling fs layer" if j > 1 { status = fmt.Sprintf("Pulling fs layer [retries: %d]", j) } out.Write(sf.FormatProgress(utils.TruncateID(id), status, nil)) layer, err := r.GetRemoteImageLayer(img.ID, endpoint, token, int64(imgSize)) if uerr, ok := err.(*url.Error); ok { err = uerr.Err } if terr, ok := err.(net.Error); ok && terr.Timeout() && j < retries { time.Sleep(time.Duration(j) * 500 * time.Millisecond) continue } else if err != nil { out.Write(sf.FormatProgress(utils.TruncateID(id), "Error pulling dependent layers", nil)) return err } defer layer.Close() err = s.graph.Register(imgJSON, utils.ProgressReader(layer, imgSize, out, sf, false, utils.TruncateID(id), "Downloading"), img) if terr, ok := err.(net.Error); ok && terr.Timeout() && j < retries { time.Sleep(time.Duration(j) * 500 * time.Millisecond) continue } else if err != nil { out.Write(sf.FormatProgress(utils.TruncateID(id), "Error downloading dependent layers", nil)) return err } else { break } } } out.Write(sf.FormatProgress(utils.TruncateID(id), "Download complete", nil)) } return nil }