func uploadItem(c *cli.Context, hash string, item client.IndexItem, bar *pb.ProgressBar, ch chan error) {
data, err := ioutil.ReadFile(item.Name)
if err != nil {
ch <- err
return
}
for i := 0; i < 3; i++ {
err = rackClient(c).IndexUpload(hash, data)
if err != nil {
continue
}
bar.Add(item.Size)
ch <- nil
return
}
ch <- fmt.Errorf("max 3 retries on upload")
return
}