func downloadFile(writer io.Writer, ptr *Pointer, workingfile, mediafile string, manifest *transfer.Manifest, cb progress.CopyCallback) error { fmt.Fprintf(os.Stderr, "Downloading %s (%s)\n", workingfile, pb.FormatBytes(ptr.Size)) xfers := manifest.GetDownloadAdapterNames() obj, adapterName, err := api.BatchOrLegacySingle(config.Config, &api.ObjectResource{Oid: ptr.Oid, Size: ptr.Size}, "download", xfers) if err != nil { return errors.Wrapf(err, "Error downloading %s: %s", filepath.Base(mediafile), err) } if ptr.Size == 0 { ptr.Size = obj.Size } adapter := manifest.NewDownloadAdapter(adapterName) var tcb transfer.TransferProgressCallback if cb != nil { tcb = func(name string, totalSize, readSoFar int64, readSinceLast int) error { return cb(totalSize, readSoFar, readSinceLast) } } // Single download adapterResultChan := make(chan transfer.TransferResult, 1) err = adapter.Begin(1, tcb, adapterResultChan) if err != nil { return err } adapter.Add(transfer.NewTransfer(filepath.Base(workingfile), obj, mediafile)) adapter.End() res := <-adapterResultChan if res.Error != nil { return errors.Wrapf(err, "Error buffering media file: %s", res.Error) } return readLocalFile(writer, ptr, mediafile, workingfile, nil) }