| package vfs |
| |
| import ( |
| "fmt" |
| "github.com/dotcloud/docker/graphdriver" |
| "os" |
| "os/exec" |
| "path" |
| ) |
| |
| func init() { |
| graphdriver.Register("vfs", Init) |
| } |
| |
| func Init(home string) (graphdriver.Driver, error) { |
| d := &Driver{ |
| home: home, |
| } |
| return d, nil |
| } |
| |
| type Driver struct { |
| home string |
| } |
| |
| func (d *Driver) String() string { |
| return "vfs" |
| } |
| |
| func (d *Driver) Status() [][2]string { |
| return nil |
| } |
| |
| func (d *Driver) Cleanup() error { |
| return nil |
| } |
| |
| func copyDir(src, dst string) error { |
| if output, err := exec.Command("cp", "-aT", "--reflink=auto", src, dst).CombinedOutput(); err != nil { |
| return fmt.Errorf("Error VFS copying directory: %s (%s)", err, output) |
| } |
| return nil |
| } |
| |
| func (d *Driver) Create(id string, parent string) error { |
| dir := d.dir(id) |
| if err := os.MkdirAll(path.Dir(dir), 0700); err != nil { |
| return err |
| } |
| if err := os.Mkdir(dir, 0700); err != nil { |
| return err |
| } |
| if parent == "" { |
| return nil |
| } |
| parentDir, err := d.Get(parent) |
| if err != nil { |
| return fmt.Errorf("%s: %s", parent, err) |
| } |
| if err := copyDir(parentDir, dir); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func (d *Driver) dir(id string) string { |
| return path.Join(d.home, "dir", path.Base(id)) |
| } |
| |
| func (d *Driver) Remove(id string) error { |
| if _, err := os.Stat(d.dir(id)); err != nil { |
| return err |
| } |
| return os.RemoveAll(d.dir(id)) |
| } |
| |
| func (d *Driver) Get(id string) (string, error) { |
| dir := d.dir(id) |
| if st, err := os.Stat(dir); err != nil { |
| return "", err |
| } else if !st.IsDir() { |
| return "", fmt.Errorf("%s: not a directory", dir) |
| } |
| return dir, nil |
| } |
| |
| func (d *Driver) Put(id string) { |
| // The vfs driver has no runtime resources (e.g. mounts) |
| // to clean up, so we don't need anything here |
| } |
| |
| func (d *Driver) Exists(id string) bool { |
| _, err := os.Stat(d.dir(id)) |
| return err == nil |
| } |