Example #1
0
// New returns a new AUFS driver.
// An error is returned if AUFS is not supported.
func Init(root string, options []string) (graphdriver.Driver, error) {
	// Try to load the aufs kernel module
	if err := supportsAufs(); err != nil {
		return nil, graphdriver.ErrNotSupported
	}

	rootdir := path.Dir(root)

	var buf syscall.Statfs_t
	if err := syscall.Statfs(rootdir, &buf); err != nil {
		return nil, fmt.Errorf("Couldn't stat the root directory: %s", err)
	}

	for _, magic := range incompatibleFsMagic {
		if graphdriver.FsMagic(buf.Type) == magic {
			return nil, graphdriver.ErrIncompatibleFS
		}
	}

	paths := []string{
		"mnt",
		"diff",
		"layers",
	}

	a := &Driver{
		root:   root,
		active: make(map[string]int),
	}

	// Create the root aufs driver dir and return
	// if it already exists
	// If not populate the dir structure
	if err := os.MkdirAll(root, 0755); err != nil {
		if os.IsExist(err) {
			return a, nil
		}
		return nil, err
	}

	if err := graphdriver.MakePrivate(root); err != nil {
		return nil, err
	}

	for _, p := range paths {
		if err := os.MkdirAll(path.Join(root, p), 0755); err != nil {
			return nil, err
		}
	}
	return a, nil
}
Example #2
0
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 := graphdriver.MakePrivate(home); err != nil {
		return nil, err
	}

	return &Driver{
		home: home,
	}, nil
}