// Init returns a new BTRFS driver. // An error is returned if BTRFS is not supported. func Init(home string, options []string) (graphdriver.Driver, error) { rootdir := path.Dir(home) var buf syscall.Statfs_t if err := syscall.Statfs(rootdir, &buf); err != nil { return nil, err } if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicBtrfs { return nil, graphdriver.ErrPrerequisites } if err := os.MkdirAll(home, 0700); err != nil { return nil, err } if err := mount.MakePrivate(home); err != nil { return nil, err } driver := &Driver{ home: home, } return graphdriver.NaiveDiffDriver(driver), nil }
func checkRootdirFs(rootdir string) error { var buf syscall.Statfs_t if err := syscall.Statfs(rootdir, &buf); err != nil { return fmt.Errorf("Failed to access '%s': %s", rootdir, err) } if graphdriver.FsMagic(buf.Type) != graphdriver.FsMagicZfs { logrus.Debugf("[zfs] no zfs dataset found for rootdir '%s'", rootdir) return graphdriver.ErrPrerequisites } return nil }