github.com/slava-ustovytski/docker@v1.8.2-rc1/daemon/volumes_linux.go (about) 1 // +build !windows 2 3 package daemon 4 5 import ( 6 "os" 7 "path/filepath" 8 "sort" 9 "strings" 10 11 "github.com/docker/docker/daemon/execdriver" 12 "github.com/docker/docker/pkg/system" 13 "github.com/docker/docker/volume" 14 "github.com/docker/docker/volume/local" 15 ) 16 17 // copyOwnership copies the permissions and uid:gid of the source file 18 // into the destination file 19 func copyOwnership(source, destination string) error { 20 stat, err := system.Stat(source) 21 if err != nil { 22 return err 23 } 24 25 if err := os.Chown(destination, int(stat.Uid()), int(stat.Gid())); err != nil { 26 return err 27 } 28 29 return os.Chmod(destination, os.FileMode(stat.Mode())) 30 } 31 32 func (container *Container) setupMounts() ([]execdriver.Mount, error) { 33 var mounts []execdriver.Mount 34 for _, m := range container.MountPoints { 35 path, err := m.Setup() 36 if err != nil { 37 return nil, err 38 } 39 if !container.trySetNetworkMount(m.Destination, path) { 40 mounts = append(mounts, execdriver.Mount{ 41 Source: path, 42 Destination: m.Destination, 43 Writable: m.RW, 44 }) 45 } 46 } 47 48 mounts = sortMounts(mounts) 49 return append(mounts, container.networkMounts()...), nil 50 } 51 52 func sortMounts(m []execdriver.Mount) []execdriver.Mount { 53 sort.Sort(mounts(m)) 54 return m 55 } 56 57 type mounts []execdriver.Mount 58 59 func (m mounts) Len() int { 60 return len(m) 61 } 62 63 func (m mounts) Less(i, j int) bool { 64 return m.parts(i) < m.parts(j) 65 } 66 67 func (m mounts) Swap(i, j int) { 68 m[i], m[j] = m[j], m[i] 69 } 70 71 func (m mounts) parts(i int) int { 72 return len(strings.Split(filepath.Clean(m[i].Destination), string(os.PathSeparator))) 73 } 74 75 // migrateVolume links the contents of a volume created pre Docker 1.7 76 // into the location expected by the local driver. 77 // It creates a symlink from DOCKER_ROOT/vfs/dir/VOLUME_ID to DOCKER_ROOT/volumes/VOLUME_ID/_container_data. 78 // It preserves the volume json configuration generated pre Docker 1.7 to be able to 79 // downgrade from Docker 1.7 to Docker 1.6 without losing volume compatibility. 80 func migrateVolume(id, vfs string) error { 81 l, err := getVolumeDriver(volume.DefaultDriverName) 82 if err != nil { 83 return err 84 } 85 86 newDataPath := l.(*local.Root).DataPath(id) 87 fi, err := os.Stat(newDataPath) 88 if err != nil && !os.IsNotExist(err) { 89 return err 90 } 91 92 if fi != nil && fi.IsDir() { 93 return nil 94 } 95 96 return os.Symlink(vfs, newDataPath) 97 } 98 99 // validVolumeLayout checks whether the volume directory layout 100 // is valid to work with Docker post 1.7 or not. 101 func validVolumeLayout(files []os.FileInfo) bool { 102 if len(files) == 1 && files[0].Name() == local.VolumeDataPathName && files[0].IsDir() { 103 return true 104 } 105 106 if len(files) != 2 { 107 return false 108 } 109 110 for _, f := range files { 111 if f.Name() == "config.json" || 112 (f.Name() == local.VolumeDataPathName && f.Mode()&os.ModeSymlink == os.ModeSymlink) { 113 // Old volume configuration, we ignore it 114 continue 115 } 116 return false 117 } 118 119 return true 120 }