Ejemplo n.º 1
0
func (b *Provider) DestroyVolume(vol volume.Volume) error {
	zvol, err := b.owns(vol)
	if err != nil {
		return err
	}
	if vol.IsSnapshot() {
		if err := syscall.Unmount(vol.Location(), 0); err != nil {
			return err
		}
		os.Remove(vol.Location())
	}
	if err := zvol.dataset.Destroy(zfs.DestroyForceUmount); err != nil {
		for i := 0; i < 5 && err != nil && IsDatasetBusyError(err); i++ {
			// sometimes zfs will claim to be busy as if files are still open even when all container processes are dead.
			// usually this goes away, so retry a few times.
			time.Sleep(1 * time.Second)
			err = zvol.dataset.Destroy(zfs.DestroyForceUmount)
		}
		if err != nil {
			return err
		}
	}
	os.Remove(zvol.basemount)
	delete(b.volumes, vol.Info().ID)
	return nil
}
Ejemplo n.º 2
0
Archivo: zfs.go Proyecto: imjorge/flynn
func (p *Provider) ForkVolume(vol volume.Volume) (volume.Volume, error) {
	zvol, err := p.owns(vol)
	if err != nil {
		return nil, err
	}
	if !vol.IsSnapshot() {
		return nil, fmt.Errorf("can only fork a snapshot")
	}
	id := random.UUID()
	info := &volume.Info{ID: id, Type: vol.Info().Type}
	v2 := &zfsVolume{
		info:      info,
		provider:  zvol.provider,
		basemount: p.mountPath(info),
	}
	cloneID := fmt.Sprintf("%s/%s", zvol.provider.dataset.Name, id)
	v2.dataset, err = zvol.dataset.Clone(cloneID, map[string]string{
		"mountpoint": v2.basemount,
	})
	if err != nil {
		return nil, fmt.Errorf("could not fork volume: %s", err)
	}
	p.volumes[id] = v2
	return v2, nil
}
Ejemplo n.º 3
0
func (b *Provider) SendSnapshot(vol volume.Volume, haves []json.RawMessage, output io.Writer) error {
	zvol, err := b.owns(vol)
	if err != nil {
		return err
	}
	if !vol.IsSnapshot() {
		return fmt.Errorf("can only send a snapshot")
	}
	// zfs recv can only really accept snapshots that apply to the current tip
	var latestRemote string
	if haves != nil && len(haves) > 0 {
		have := &zfsHaves{}
		if err := json.Unmarshal(haves[len(haves)-1], have); err == nil {
			latestRemote = have.SnapID
		}
	}
	// look for intersection of existing snapshots on this volume; if so do incremental
	parentName := strings.SplitN(zvol.dataset.Name, "@", 2)[0]
	parentDataset, err := zfs.GetDataset(parentName)
	if err != nil {
		return err
	}
	snapshots, err := parentDataset.Snapshots()
	if err != nil {
		return err
	}
	// we can fly incremental iff the latest snap on the remote is available here
	useIncremental := false
	if latestRemote != "" {
		for _, snap := range snapshots {
			if strings.SplitN(snap.Name, "@", 2)[1] == latestRemote {
				useIncremental = true
				break
			}
		}
	}
	// at last, send:
	if useIncremental {
		sendCmd := exec.Command("zfs", "send", "-i", latestRemote, zvol.dataset.Name)
		sendCmd.Stdout = output
		return sendCmd.Run()
	}
	return zvol.dataset.SendSnapshot(output)
}