Пример #1
0
// TempLayerArchive creates a temporary archive of the given image's filesystem layer.
//   The archive is stored on disk and will be automatically deleted as soon as has been read.
//   If output is not nil, a human-readable progress bar will be written to it.
//   FIXME: does this belong in Graph? How about MktempFile, let the caller use it for archives?
func (graph *Graph) TempLayerArchive(id string, compression archive.Compression, sf *utils.StreamFormatter, output io.Writer) (*archive.TempArchive, error) {
	image, err := graph.Get(id)
	if err != nil {
		return nil, err
	}
	tmp, err := graph.Mktemp("")
	if err != nil {
		return nil, err
	}
	a, err := image.TarLayer()
	if err != nil {
		return nil, err
	}
	progress := utils.ProgressReader(a, 0, output, sf, false, utils.TruncateID(id), "Buffering to disk")
	defer progress.Close()
	return archive.NewTempArchive(progress, tmp)
}
Пример #2
0
// CmdTarLayer return the tarLayer of the image
func (s *TagStore) CmdTarLayer(job *engine.Job) engine.Status {
	if len(job.Args) != 1 {
		return job.Errorf("usage: %s NAME", job.Name)
	}
	name := job.Args[0]
	if image, err := s.LookupImage(name); err == nil && image != nil {
		fs, err := image.TarLayer()
		if err != nil {
			return job.Error(err)
		}
		defer fs.Close()

		if written, err := io.Copy(job.Stdout, fs); err != nil {
			return job.Error(err)
		} else {
			utils.Debugf("rendered layer for %s of [%d] size", image.ID, written)
		}

		return engine.StatusOK
	}
	return job.Errorf("No such image: %s", name)
}