func Init(home string, options []string) (graphdriver.Driver, error) { fsMagic, err := graphdriver.GetFSMagic(home) if err != nil { return nil, err } if fsName, ok := graphdriver.FsNames[fsMagic]; ok { backingFs = fsName } deviceSet, err := NewDeviceSet(home, true, options) if err != nil { return nil, err } if err := mount.MakePrivate(home); err != nil { return nil, err } d := &Driver{ DeviceSet: deviceSet, home: home, } return graphdriver.NaiveDiffDriver(d), nil }
// Init returns a new AUFS driver. // An error is returned if AUFS is not supported. func Init(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) { // Try to load the aufs kernel module if err := supportsAufs(); err != nil { return nil, graphdriver.ErrNotSupported } fsMagic, err := graphdriver.GetFSMagic(root) if err != nil { return nil, err } if fsName, ok := graphdriver.FsNames[fsMagic]; ok { backingFs = fsName } for _, magic := range incompatibleFsMagic { if fsMagic == magic { return nil, graphdriver.ErrIncompatibleFS } } paths := []string{ "mnt", "diff", "layers", } a := &Driver{ root: root, active: make(map[string]*data), uidMaps: uidMaps, gidMaps: gidMaps, } rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps) if err != nil { return nil, err } // Create the root aufs driver dir and return // if it already exists // If not populate the dir structure if err := idtools.MkdirAllAs(root, 0755, rootUID, rootGID); err != nil { if os.IsExist(err) { return a, nil } return nil, err } if err := mountpk.MakePrivate(root); err != nil { return nil, err } // Populate the dir structure for _, p := range paths { if err := idtools.MkdirAllAs(path.Join(root, p), 0755, rootUID, rootGID); err != nil { return nil, err } } return a, nil }
func Init(home string, options []string) (graphdriver.Driver, error) { if err := supportsOverlay(); err != nil { return nil, graphdriver.ErrNotSupported } fsMagic, err := graphdriver.GetFSMagic(home) if err != nil { return nil, err } if fsName, ok := graphdriver.FsNames[fsMagic]; ok { backingFs = fsName } // check if they are running over btrfs or aufs switch fsMagic { case graphdriver.FsMagicBtrfs: log.Error("'overlay' is not supported over btrfs.") return nil, graphdriver.ErrIncompatibleFS case graphdriver.FsMagicAufs: log.Error("'overlay' is not supported over aufs.") return nil, graphdriver.ErrIncompatibleFS case graphdriver.FsMagicZfs: log.Error("'overlay' is not supported over zfs.") return nil, graphdriver.ErrIncompatibleFS } // Create the driver home dir if err := os.MkdirAll(home, 0755); err != nil && !os.IsExist(err) { return nil, err } d := &Driver{ home: home, active: make(map[string]*ActiveMount), } return NaiveDiffDriverWithApply(d), nil }