func fetch(cl *client.Client, br *blobref.BlobRef) (r io.ReadCloser, err error) {
if *flagVerbose {
log.Printf("Fetching %s", br.String())
}
if len(viaRefs) > 0 {
r, _, err = cl.FetchVia(br, viaRefs)
} else {
r, _, err = cl.FetchStreaming(br)
}
if err != nil {
return nil, fmt.Errorf("Failed to fetch %q: %s", br, err)
}
return r, err
}