package volumes import ( "encoding/json" "io/ioutil" "os" "path/filepath" "sync" "github.com/docker/docker/pkg/symlink" ) type Volume struct { ID string Path string IsBindMount bool Writable bool Containers map[string]struct{} configPath string repository *Repository lock sync.Mutex } func (v *Volume) IsDir() (bool, error) { stat, err := os.Stat(v.Path) if err != nil { return false, err } return stat.IsDir(), nil } func (v *Volume) RemoveContainer(containerId string) { v.lock.Lock() delete(v.Containers, containerId) v.lock.Unlock() } func (v *Volume) AddContainer(containerId string) { v.lock.Lock() v.Containers[containerId] = struct{}{} v.lock.Unlock() } func (v *Volume) createIfNotExist() error { if stat, err := os.Stat(v.Path); err != nil && os.IsNotExist(err) { if stat.IsDir() { os.MkdirAll(v.Path, 0755) } if err := os.MkdirAll(filepath.Dir(v.Path), 0755); err != nil { return err } f, err := os.OpenFile(v.Path, os.O_CREATE, 0755) if err != nil { return err } f.Close() } return nil } func (v *Volume) initialize() error { v.lock.Lock() defer v.lock.Unlock() if err := v.createIfNotExist(); err != nil { return err } if err := os.MkdirAll(v.configPath, 0755); err != nil { return err } jsonPath, err := v.jsonPath() if err != nil { return err } f, err := os.Create(jsonPath) if err != nil { return err } defer f.Close() return v.toDisk() } func (v *Volume) ToDisk() error { v.lock.Lock() defer v.lock.Unlock() return v.toDisk() } func (v *Volume) toDisk() error { data, err := json.Marshal(v) if err != nil { return err } pth, err := v.jsonPath() if err != nil { return err } return ioutil.WriteFile(pth, data, 0666) } func (v *Volume) FromDisk() error { v.lock.Lock() defer v.lock.Unlock() pth, err := v.jsonPath() if err != nil { return err } data, err := ioutil.ReadFile(pth) if err != nil { return err } return json.Unmarshal(data, v) } func (v *Volume) jsonPath() (string, error) { return v.getRootResourcePath("config.json") } func (v *Volume) getRootResourcePath(path string) (string, error) { cleanPath := filepath.Join("/", path) return symlink.FollowSymlinkInScope(filepath.Join(v.configPath, cleanPath), v.configPath) }