示例#1
0
// 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
}
示例#2
0
// NewGraph instantiates a new graph at the given root path in the filesystem.
// `root` will be created if it doesn't exist.
func NewGraph(root string, driver graphdriver.Driver, uidMaps, gidMaps []idtools.IDMap) (*Graph, error) {
	abspath, err := filepath.Abs(root)
	if err != nil {
		return nil, err
	}

	rootUID, rootGID, err := idtools.GetRootUIDGID(uidMaps, gidMaps)
	if err != nil {
		return nil, err
	}
	// Create the root directory if it doesn't exists
	if err := idtools.MkdirAllAs(root, 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
		return nil, err
	}

	graph := &Graph{
		root:       abspath,
		idIndex:    truncindex.NewTruncIndex([]string{}),
		driver:     driver,
		retained:   &retainedLayers{layerHolders: make(map[string]map[string]struct{})},
		uidMaps:    uidMaps,
		gidMaps:    gidMaps,
		parentRefs: make(map[string]int),
	}

	// Windows does not currently support tarsplit functionality.
	if runtime.GOOS == "windows" {
		graph.tarSplitDisabled = true
	}

	if err := graph.restore(); err != nil {
		return nil, err
	}
	return graph, nil
}
示例#3
0
// mktemp creates a temporary sub-directory inside the graph's filesystem.
func (graph *Graph) mktemp() (string, error) {
	dir := filepath.Join(graph.root, "_tmp", stringid.GenerateNonCryptoID())
	rootUID, rootGID, err := idtools.GetRootUIDGID(graph.uidMaps, graph.gidMaps)
	if err != nil {
		return "", err
	}
	if err := idtools.MkdirAllAs(dir, 0700, rootUID, rootGID); err != nil {
		return "", err
	}
	return dir, nil
}
示例#4
0
func (a *Driver) createDirsFor(id string) error {
	paths := []string{
		"mnt",
		"diff",
	}

	rootUID, rootGID, err := idtools.GetRootUIDGID(a.uidMaps, a.gidMaps)
	if err != nil {
		return err
	}
	for _, p := range paths {
		if err := idtools.MkdirAllAs(path.Join(a.rootPath(), p, id), 0755, rootUID, rootGID); err != nil {
			return err
		}
	}
	return nil
}