// 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
}
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
}