Esempio n. 1
0
// Init creates a driver with the given home and the set of options.
func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
	deviceSet, err := NewDeviceSet(home, true, options, uidMaps, gidMaps)
	if err != nil {
		return nil, err
	}

	if err := mount.MakePrivate(home); err != nil {
		return nil, err
	}

	d := &Driver{
		DeviceSet: deviceSet,
		home:      home,
		uidMaps:   uidMaps,
		gidMaps:   gidMaps,
		ctr:       graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
	}

	return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}
Esempio n. 2
0
// Init returns a new ZFS driver.
// It takes base mount path and an array of options which are represented as key value pairs.
// Each option is in the for key=value. 'zfs.fsname' is expected to be a valid key in the options.
func Init(base string, opt []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
	var err error

	if _, err := exec.LookPath("zfs"); err != nil {
		logrus.Debugf("[zfs] zfs command is not available: %v", err)
		return nil, graphdriver.ErrPrerequisites
	}

	file, err := os.OpenFile("/dev/zfs", os.O_RDWR, 600)
	if err != nil {
		logrus.Debugf("[zfs] cannot open /dev/zfs: %v", err)
		return nil, graphdriver.ErrPrerequisites
	}
	defer file.Close()

	options, err := parseOptions(opt)
	if err != nil {
		return nil, err
	}
	options.mountPath = base

	rootdir := path.Dir(base)

	if options.fsName == "" {
		err = checkRootdirFs(rootdir)
		if err != nil {
			return nil, err
		}
	}

	if options.fsName == "" {
		options.fsName, err = lookupZfsDataset(rootdir)
		if err != nil {
			return nil, err
		}
	}

	zfs.SetLogger(new(Logger))

	filesystems, err := zfs.Filesystems(options.fsName)
	if err != nil {
		return nil, fmt.Errorf("Cannot find root filesystem %s: %v", options.fsName, err)
	}

	filesystemsCache := make(map[string]bool, len(filesystems))
	var rootDataset *zfs.Dataset
	for _, fs := range filesystems {
		if fs.Name == options.fsName {
			rootDataset = fs
		}
		filesystemsCache[fs.Name] = true
	}

	if rootDataset == nil {
		return nil, fmt.Errorf("BUG: zfs get all -t filesystem -rHp '%s' should contain '%s'", options.fsName, options.fsName)
	}

	rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
	if err != nil {
		return nil, fmt.Errorf("Failed to get root uid/guid: %v", err)
	}
	if err := idtools.MkdirAllAs(base, 0700, rootUID, rootGID); err != nil {
		return nil, fmt.Errorf("Failed to create '%s': %v", base, err)
	}

	if err := mount.MakePrivate(base); err != nil {
		return nil, err
	}
	d := &Driver{
		dataset:          rootDataset,
		options:          options,
		filesystemsCache: filesystemsCache,
		uidMaps:          uidMaps,
		gidMaps:          gidMaps,
		ctr:              graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
	}
	return graphdriver.NewNaiveDiffDriver(d, uidMaps, gidMaps), nil
}