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Allow to downgrade local volumes from > 1.7 to 1.6.

Browse source 
Signed-off-by: David Calavera <david.calavera@gmail.com>
This commit is contained in:
David Calavera 2015-06-03 09:26:41 -07:00
parent 4ad05ed985
commit bd9814f0db
7 changed files with 444 additions and 107 deletions
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5
daemon/container.go
View file

@ -73,7 +73,10 @@ type CommonContainer struct {
MountLabel, ProcessLabel string
RestartCount int
UpdateDns bool
MountPoints map[string]*mountPoint
MountPoints map[string]*mountPoint
Volumes map[string]string // Deprecated since 1.7, kept for backwards compatibility
VolumesRW map[string]bool // Deprecated since 1.7, kept for backwards compatibility
hostConfig *runconfig.HostConfig
command *execdriver.Command

53
daemon/daemon.go
View file

@ -50,8 +50,6 @@ import (
"github.com/docker/docker/volume/local"
)
const defaultVolumesPathName = "volumes"
var (
validContainerNameChars = `[a-zA-Z0-9][a-zA-Z0-9_.-]`
validContainerNamePattern = regexp.MustCompile(`^/?` + validContainerNameChars + `+$`)
@ -158,12 +156,7 @@ func (daemon *Daemon) containerRoot(id string) string {
// This is typically done at startup.
func (daemon *Daemon) load(id string) (*Container, error) {
container := &Container{
CommonContainer: CommonContainer{
State: NewState(),
root: daemon.containerRoot(id),
MountPoints: make(map[string]*mountPoint),
execCommands: newExecStore(),
},
CommonContainer: daemon.newBaseContainer(id),
}
if err := container.FromDisk(); err != nil {
@ -509,25 +502,21 @@ func (daemon *Daemon) newContainer(name string, config *runconfig.Config, imgID
daemon.generateHostname(id, config)
entrypoint, args := daemon.getEntrypointAndArgs(config.Entrypoint, config.Cmd)
base := daemon.newBaseContainer(id)
base.Created = time.Now().UTC()
base.Path = entrypoint
base.Args = args //FIXME: de-duplicate from config
base.Config = config
base.hostConfig = &runconfig.HostConfig{}
base.ImageID = imgID
base.NetworkSettings = &network.Settings{}
base.Name = name
base.Driver = daemon.driver.String()
base.ExecDriver = daemon.execDriver.Name()
container := &Container{
CommonContainer: CommonContainer{
ID: id, // FIXME: we should generate the ID here instead of receiving it as an argument
Created: time.Now().UTC(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
hostConfig: &runconfig.HostConfig{},
ImageID: imgID,
NetworkSettings: &network.Settings{},
Name: name,
Driver: daemon.driver.String(),
ExecDriver: daemon.execDriver.Name(),
State: NewState(),
execCommands: newExecStore(),
MountPoints: map[string]*mountPoint{},
},
CommonContainer: base,
}
container.root = daemon.containerRoot(container.ID)
return container, err
}
@ -775,7 +764,7 @@ func NewDaemon(config *Config, registryService *registry.Service) (daemon *Daemo
return nil, err
}
volumesDriver, err := local.New(filepath.Join(config.Root, defaultVolumesPathName))
volumesDriver, err := local.New(config.Root)
if err != nil {
return nil, err
}
@ -1244,3 +1233,15 @@ func (daemon *Daemon) setHostConfig(container *Container, hostConfig *runconfig.
container.toDisk()
return nil
}
func (daemon *Daemon) newBaseContainer(id string) CommonContainer {
return CommonContainer{
ID: id,
State: NewState(),
MountPoints: make(map[string]*mountPoint),
Volumes: make(map[string]string),
VolumesRW: make(map[string]bool),
execCommands: newExecStore(),
root: daemon.containerRoot(id),
}
}

227
daemon/daemon_test.go
View file

@ -12,6 +12,8 @@ import (
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/truncindex"
"github.com/docker/docker/volume"
"github.com/docker/docker/volume/drivers"
"github.com/docker/docker/volume/local"
)
//
@ -178,10 +180,11 @@ func TestLoadWithVolume(t *testing.T) {
t.Fatal(err)
}
daemon := &Daemon{
repository: tmp,
root: tmp,
daemon, err := initDaemonForVolumesTest(tmp)
if err != nil {
t.Fatal(err)
}
defer volumedrivers.Unregister(volume.DefaultDriverName)
c, err := daemon.load(containerId)
if err != nil {
@ -214,7 +217,7 @@ func TestLoadWithVolume(t *testing.T) {
t.Fatalf("Expected mount driver local, was %s\n", m.Driver)
}
newVolumeContent := filepath.Join(volumePath, "helo")
newVolumeContent := filepath.Join(volumePath, local.VolumeDataPathName, "helo")
b, err := ioutil.ReadFile(newVolumeContent)
if err != nil {
t.Fatal(err)
@ -265,10 +268,11 @@ func TestLoadWithBindMount(t *testing.T) {
t.Fatal(err)
}
daemon := &Daemon{
repository: tmp,
root: tmp,
daemon, err := initDaemonForVolumesTest(tmp)
if err != nil {
t.Fatal(err)
}
defer volumedrivers.Unregister(volume.DefaultDriverName)
c, err := daemon.load(containerId)
if err != nil {
@ -301,3 +305,212 @@ func TestLoadWithBindMount(t *testing.T) {
t.Fatalf("Expected mount point to be RW but it was not\n")
}
}
func TestLoadWithVolume17RC(t *testing.T) {
tmp, err := ioutil.TempDir("", "docker-daemon-test-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmp)
containerId := "d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e"
containerPath := filepath.Join(tmp, containerId)
if err := os.MkdirAll(containerPath, 0755); err != nil {
t.Fatal(err)
}
hostVolumeId := "6a3c03fc4a4e588561a543cc3bdd50089e27bd11bbb0e551e19bf735e2514101"
volumePath := filepath.Join(tmp, "volumes", hostVolumeId)
if err := os.MkdirAll(volumePath, 0755); err != nil {
t.Fatal(err)
}
content := filepath.Join(volumePath, "helo")
if err := ioutil.WriteFile(content, []byte("HELO"), 0644); err != nil {
t.Fatal(err)
}
config := `{"State":{"Running":true,"Paused":false,"Restarting":false,"OOMKilled":false,"Dead":false,"Pid":2464,"ExitCode":0,
"Error":"","StartedAt":"2015-05-26T16:48:53.869308965Z","FinishedAt":"0001-01-01T00:00:00Z"},
"ID":"d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e","Created":"2015-05-26T16:48:53.7987917Z","Path":"top",
"Args":[],"Config":{"Hostname":"d59df5276e7b","Domainname":"","User":"","Memory":0,"MemorySwap":0,"CpuShares":0,"Cpuset":"",
"AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"PortSpecs":null,"ExposedPorts":null,"Tty":true,"OpenStdin":true,
"StdinOnce":false,"Env":null,"Cmd":["top"],"Image":"ubuntu:latest","Volumes":null,"WorkingDir":"","Entrypoint":null,
"NetworkDisabled":false,"MacAddress":"","OnBuild":null,"Labels":{}},"Image":"07f8e8c5e66084bef8f848877857537ffe1c47edd01a93af27e7161672ad0e95",
"NetworkSettings":{"IPAddress":"172.17.0.1","IPPrefixLen":16,"MacAddress":"02:42:ac:11:00:01","LinkLocalIPv6Address":"fe80::42:acff:fe11:1",
"LinkLocalIPv6PrefixLen":64,"GlobalIPv6Address":"","GlobalIPv6PrefixLen":0,"Gateway":"172.17.42.1","IPv6Gateway":"","Bridge":"docker0","PortMapping":null,"Ports":{}},
"ResolvConfPath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/resolv.conf",
"HostnamePath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/hostname",
"HostsPath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/hosts",
"LogPath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e-json.log",
"Name":"/ubuntu","Driver":"aufs","ExecDriver":"native-0.2","MountLabel":"","ProcessLabel":"","AppArmorProfile":"","RestartCount":0,
"UpdateDns":false,"MountPoints":{"/vol1":{"Name":"6a3c03fc4a4e588561a543cc3bdd50089e27bd11bbb0e551e19bf735e2514101","Destination":"/vol1","Driver":"local","RW":true,"Source":"","Relabel":""}},"AppliedVolumesFrom":null}`
if err = ioutil.WriteFile(filepath.Join(containerPath, "config.json"), []byte(config), 0644); err != nil {
t.Fatal(err)
}
hostConfig := `{"Binds":[],"ContainerIDFile":"","LxcConf":[],"Memory":0,"MemorySwap":0,"CpuShares":0,"CpusetCpus":"",
"Privileged":false,"PortBindings":{},"Links":null,"PublishAllPorts":false,"Dns":null,"DnsSearch":null,"ExtraHosts":null,"VolumesFrom":null,
"Devices":[],"NetworkMode":"bridge","IpcMode":"","PidMode":"","CapAdd":null,"CapDrop":null,"RestartPolicy":{"Name":"no","MaximumRetryCount":0},
"SecurityOpt":null,"ReadonlyRootfs":false,"Ulimits":null,"LogConfig":{"Type":"","Config":null},"CgroupParent":""}`
if err = ioutil.WriteFile(filepath.Join(containerPath, "hostconfig.json"), []byte(hostConfig), 0644); err != nil {
t.Fatal(err)
}
daemon, err := initDaemonForVolumesTest(tmp)
if err != nil {
t.Fatal(err)
}
defer volumedrivers.Unregister(volume.DefaultDriverName)
c, err := daemon.load(containerId)
if err != nil {
t.Fatal(err)
}
err = daemon.verifyVolumesInfo(c)
if err != nil {
t.Fatal(err)
}
if len(c.MountPoints) != 1 {
t.Fatalf("Expected 1 volume mounted, was 0\n")
}
m := c.MountPoints["/vol1"]
if m.Name != hostVolumeId {
t.Fatalf("Expected mount name to be %s, was %s\n", hostVolumeId, m.Name)
}
if m.Destination != "/vol1" {
t.Fatalf("Expected mount destination /vol1, was %s\n", m.Destination)
}
if !m.RW {
t.Fatalf("Expected mount point to be RW but it was not\n")
}
if m.Driver != volume.DefaultDriverName {
t.Fatalf("Expected mount driver local, was %s\n", m.Driver)
}
newVolumeContent := filepath.Join(volumePath, local.VolumeDataPathName, "helo")
b, err := ioutil.ReadFile(newVolumeContent)
if err != nil {
t.Fatal(err)
}
if string(b) != "HELO" {
t.Fatalf("Expected HELO, was %s\n", string(b))
}
}
func TestRemoveLocalVolumesFollowingSymlinks(t *testing.T) {
tmp, err := ioutil.TempDir("", "docker-daemon-test-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmp)
containerId := "d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e"
containerPath := filepath.Join(tmp, containerId)
if err := os.MkdirAll(containerPath, 0755); err != nil {
t.Fatal(err)
}
hostVolumeId := stringid.GenerateRandomID()
vfsPath := filepath.Join(tmp, "vfs", "dir", hostVolumeId)
volumePath := filepath.Join(tmp, "volumes", hostVolumeId)
if err := os.MkdirAll(vfsPath, 0755); err != nil {
t.Fatal(err)
}
if err := os.MkdirAll(volumePath, 0755); err != nil {
t.Fatal(err)
}
content := filepath.Join(vfsPath, "helo")
if err := ioutil.WriteFile(content, []byte("HELO"), 0644); err != nil {
t.Fatal(err)
}
config := `{"State":{"Running":true,"Paused":false,"Restarting":false,"OOMKilled":false,"Dead":false,"Pid":2464,"ExitCode":0,
"Error":"","StartedAt":"2015-05-26T16:48:53.869308965Z","FinishedAt":"0001-01-01T00:00:00Z"},
"ID":"d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e","Created":"2015-05-26T16:48:53.7987917Z","Path":"top",
"Args":[],"Config":{"Hostname":"d59df5276e7b","Domainname":"","User":"","Memory":0,"MemorySwap":0,"CpuShares":0,"Cpuset":"",
"AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"PortSpecs":null,"ExposedPorts":null,"Tty":true,"OpenStdin":true,
"StdinOnce":false,"Env":null,"Cmd":["top"],"Image":"ubuntu:latest","Volumes":null,"WorkingDir":"","Entrypoint":null,
"NetworkDisabled":false,"MacAddress":"","OnBuild":null,"Labels":{}},"Image":"07f8e8c5e66084bef8f848877857537ffe1c47edd01a93af27e7161672ad0e95",
"NetworkSettings":{"IPAddress":"172.17.0.1","IPPrefixLen":16,"MacAddress":"02:42:ac:11:00:01","LinkLocalIPv6Address":"fe80::42:acff:fe11:1",
"LinkLocalIPv6PrefixLen":64,"GlobalIPv6Address":"","GlobalIPv6PrefixLen":0,"Gateway":"172.17.42.1","IPv6Gateway":"","Bridge":"docker0","PortMapping":null,"Ports":{}},
"ResolvConfPath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/resolv.conf",
"HostnamePath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/hostname",
"HostsPath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/hosts",
"LogPath":"/var/lib/docker/containers/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e/d59df5276e7b219d510fe70565e0404bc06350e0d4b43fe961f22f339980170e-json.log",
"Name":"/ubuntu","Driver":"aufs","ExecDriver":"native-0.2","MountLabel":"","ProcessLabel":"","AppArmorProfile":"","RestartCount":0,
"UpdateDns":false,"Volumes":{"/vol1":"%s"},"VolumesRW":{"/vol1":true},"AppliedVolumesFrom":null}`
cfg := fmt.Sprintf(config, vfsPath)
if err = ioutil.WriteFile(filepath.Join(containerPath, "config.json"), []byte(cfg), 0644); err != nil {
t.Fatal(err)
}
hostConfig := `{"Binds":[],"ContainerIDFile":"","LxcConf":[],"Memory":0,"MemorySwap":0,"CpuShares":0,"CpusetCpus":"",
"Privileged":false,"PortBindings":{},"Links":null,"PublishAllPorts":false,"Dns":null,"DnsSearch":null,"ExtraHosts":null,"VolumesFrom":null,
"Devices":[],"NetworkMode":"bridge","IpcMode":"","PidMode":"","CapAdd":null,"CapDrop":null,"RestartPolicy":{"Name":"no","MaximumRetryCount":0},
"SecurityOpt":null,"ReadonlyRootfs":false,"Ulimits":null,"LogConfig":{"Type":"","Config":null},"CgroupParent":""}`
if err = ioutil.WriteFile(filepath.Join(containerPath, "hostconfig.json"), []byte(hostConfig), 0644); err != nil {
t.Fatal(err)
}
daemon, err := initDaemonForVolumesTest(tmp)
if err != nil {
t.Fatal(err)
}
defer volumedrivers.Unregister(volume.DefaultDriverName)
c, err := daemon.load(containerId)
if err != nil {
t.Fatal(err)
}
err = daemon.verifyVolumesInfo(c)
if err != nil {
t.Fatal(err)
}
if len(c.MountPoints) != 1 {
t.Fatalf("Expected 1 volume mounted, was 0\n")
}
m := c.MountPoints["/vol1"]
v, err := createVolume(m.Name, m.Driver)
if err != nil {
t.Fatal(err)
}
if err := removeVolume(v); err != nil {
t.Fatal(err)
}
fi, err := os.Stat(vfsPath)
if err == nil || !os.IsNotExist(err) {
t.Fatalf("Expected vfs path to not exist: %v - %v\n", fi, err)
}
}
func initDaemonForVolumesTest(tmp string) (*Daemon, error) {
daemon := &Daemon{
repository: tmp,
root: tmp,
}
volumesDriver, err := local.New(tmp)
if err != nil {
return nil, err
}
volumedrivers.Register(volumesDriver, volumesDriver.Name())
return daemon, nil
}

124
daemon/volumes.go
View file

@ -1,16 +1,17 @@
package daemon
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/chrootarchive"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/volume"
"github.com/docker/docker/volume/local"
"github.com/docker/libcontainer/label"
)
@ -52,6 +53,13 @@ func (m *mountPoint) Path() string {
return m.Source
}
// BackwardsCompatible decides whether this mount point can be
// used in old versions of Docker or not.
// Only bind mounts and local volumes can be used in old versions of Docker.
func (m *mountPoint) BackwardsCompatible() bool {
return len(m.Source) > 0 || m.Driver == volume.DefaultDriverName
}
func parseBindMount(spec string, mountLabel string, config *runconfig.Config) (*mountPoint, error) {
bind := &mountPoint{
RW: true,
@ -231,8 +239,20 @@ func (daemon *Daemon) registerMountPoints(container *Container, hostConfig *runc
mountPoints[bind.Destination] = bind
}
// Keep backwards compatible structures
bcVolumes := map[string]string{}
bcVolumesRW := map[string]bool{}
for _, m := range mountPoints {
if m.BackwardsCompatible() {
bcVolumes[m.Destination] = m.Path()
bcVolumesRW[m.Destination] = m.RW
}
}
container.Lock()
container.MountPoints = mountPoints
container.Volumes = bcVolumes
container.VolumesRW = bcVolumesRW
container.Unlock()
return nil
@ -241,53 +261,77 @@ func (daemon *Daemon) registerMountPoints(container *Container, hostConfig *runc
// verifyVolumesInfo ports volumes configured for the containers pre docker 1.7.
// It reads the container configuration and creates valid mount points for the old volumes.
func (daemon *Daemon) verifyVolumesInfo(container *Container) error {
jsonPath, err := container.jsonPath()
if err != nil {
return err
}
f, err := os.Open(jsonPath)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
// Inspect old structures only when we're upgrading from old versions
// to versions >= 1.7 and the MountPoints has not been populated with volumes data.
if len(container.MountPoints) == 0 && len(container.Volumes) > 0 {
for destination, hostPath := range container.Volumes {
vfsPath := filepath.Join(daemon.root, "vfs", "dir")
rw := container.VolumesRW != nil && container.VolumesRW[destination]
type oldContVolCfg struct {
Volumes map[string]string
VolumesRW map[string]bool
}
vols := oldContVolCfg{
Volumes: make(map[string]string),
VolumesRW: make(map[string]bool),
}
if err := json.NewDecoder(f).Decode(&vols); err != nil {
return err
}
for destination, hostPath := range vols.Volumes {
vfsPath := filepath.Join(daemon.root, "vfs", "dir")
rw := vols.VolumesRW[destination]
if strings.HasPrefix(hostPath, vfsPath) {
id := filepath.Base(hostPath)
if err := daemon.migrateVolume(id, hostPath); err != nil {
return err
if strings.HasPrefix(hostPath, vfsPath) {
id := filepath.Base(hostPath)
if err := migrateVolume(id, hostPath); err != nil {
return err
}
container.addLocalMountPoint(id, destination, rw)
} else { // Bind mount
id, source, err := parseVolumeSource(hostPath)
// We should not find an error here coming
// from the old configuration, but who knows.
if err != nil {
return err
}
container.addBindMountPoint(id, source, destination, rw)
}
container.addLocalMountPoint(id, destination, rw)
} else { // Bind mount
id, source, err := parseVolumeSource(hostPath)
// We should not find an error here coming
// from the old configuration, but who knows.
}
} else if len(container.MountPoints) > 0 {
// Volumes created with a Docker version >= 1.7. We verify integrity in case of data created
// with Docker 1.7 RC versions that put the information in
// DOCKER_ROOT/volumes/VOLUME_ID rather than DOCKER_ROOT/volumes/VOLUME_ID/_container_data.
l, err := getVolumeDriver(volume.DefaultDriverName)
if err != nil {
return err
}
for _, m := range container.MountPoints {
if m.Driver != volume.DefaultDriverName {
continue
}
dataPath := l.(*local.Root).DataPath(m.Name)
volumePath := filepath.Dir(dataPath)
d, err := ioutil.ReadDir(volumePath)
if err != nil {
// If the volume directory doesn't exist yet it will be recreated,
// so we only return the error when there is a different issue.
if !os.IsNotExist(err) {
return err
}
// Do not check when the volume directory does not exist.
continue
}
if validVolumeLayout(d) {
continue
}
if err := os.Mkdir(dataPath, 0755); err != nil {
return err
}
container.addBindMountPoint(id, source, destination, rw)
// Move data inside the data directory
for _, f := range d {
oldp := filepath.Join(volumePath, f.Name())
newp := filepath.Join(dataPath, f.Name())
if err := os.Rename(oldp, newp); err != nil {
logrus.Errorf("Unable to move %s to %s\n", oldp, newp)
}
}
}
return container.ToDisk()
}
return container.ToDisk()
return nil
}
func createVolume(name, driverName string) (volume.Volume, error) {

67
daemon/volumes_linux.go
View file

@ -8,9 +8,10 @@ import (
"sort"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/volume"
"github.com/docker/docker/volume/local"
)
// copyOwnership copies the permissions and uid:gid of the source file
@ -70,33 +71,49 @@ func (m mounts) parts(i int) int {
return len(strings.Split(filepath.Clean(m[i].Destination), string(os.PathSeparator)))
}
// migrateVolume moves the contents of a volume created pre Docker 1.7
// to the location expected by the local driver. Steps:
// 1. Save old directory that includes old volume's config json file.
// 2. Move virtual directory with content to where the local driver expects it to be.
// 3. Remove the backup of the old volume config.
func (daemon *Daemon) migrateVolume(id, vfs string) error {
volumeInfo := filepath.Join(daemon.root, defaultVolumesPathName, id)
backup := filepath.Join(daemon.root, defaultVolumesPathName, id+".back")
var err error
if err = os.Rename(volumeInfo, backup); err != nil {
return err
}
defer func() {
// Put old configuration back in place in case one of the next steps fails.
if err != nil {
os.Rename(backup, volumeInfo)
}
}()
if err = os.Rename(vfs, volumeInfo); err != nil {
// migrateVolume links the contents of a volume created pre Docker 1.7
// into the location expected by the local driver.
// It creates a symlink from DOCKER_ROOT/vfs/dir/VOLUME_ID to DOCKER_ROOT/volumes/VOLUME_ID/_container_data.
// It preserves the volume json configuration generated pre Docker 1.7 to be able to
// downgrade from Docker 1.7 to Docker 1.6 without losing volume compatibility.
func migrateVolume(id, vfs string) error {
l, err := getVolumeDriver(volume.DefaultDriverName)
if err != nil {
return err
}
if err = os.RemoveAll(backup); err != nil {
logrus.Errorf("Unable to remove volume info backup directory %s: %v", backup, err)
newDataPath := l.(*local.Root).DataPath(id)
fi, err := os.Stat(newDataPath)
if err != nil && !os.IsNotExist(err) {
return err
}
return nil
if fi != nil && fi.IsDir() {
return nil
}
return os.Symlink(vfs, newDataPath)
}
// validVolumeLayout checks whether the volume directory layout
// is valid to work with Docker post 1.7 or not.
func validVolumeLayout(files []os.FileInfo) bool {
if len(files) == 1 && files[0].Name() == local.VolumeDataPathName && files[0].IsDir() {
return true
}
if len(files) != 2 {
return false
}
for _, f := range files {
if f.Name() == "config.json" ||
(f.Name() == local.VolumeDataPathName && f.Mode()&os.ModeSymlink == os.ModeSymlink) {
// Old volume configuration, we ignore it
continue
}
return false
}
return true
}

12
daemon/volumes_windows.go
View file

@ -2,7 +2,11 @@
package daemon
import "github.com/docker/docker/daemon/execdriver"
import (
"os"
"github.com/docker/docker/daemon/execdriver"
)
// Not supported on Windows
func copyOwnership(source, destination string) error {
@ -13,6 +17,10 @@ func (container *Container) setupMounts() ([]execdriver.Mount, error) {
return nil, nil
}
func (daemon *Daemon) migrateVolume(id, vfs string) error {
func migrateVolume(id, vfs string) error {
return nil
}
func validVolumeLayout(files []os.FileInfo) bool {
return true
}

63
volume/local/local.go
View file

@ -6,29 +6,46 @@ import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"sync"
"github.com/docker/docker/volume"
)
func New(rootDirectory string) (*Root, error) {
// VolumeDataPathName is the name of the directory where the volume data is stored.
// It uses a very distintive name to avoid colissions migrating data between
// Docker versions.
const (
VolumeDataPathName = "_data"
volumesPathName = "volumes"
)
var oldVfsDir = filepath.Join("vfs", "dir")
func New(scope string) (*Root, error) {
rootDirectory := filepath.Join(scope, volumesPathName)
if err := os.MkdirAll(rootDirectory, 0700); err != nil {
return nil, err
}
r := &Root{
scope: scope,
path: rootDirectory,
volumes: make(map[string]*Volume),
}
dirs, err := ioutil.ReadDir(rootDirectory)
if err != nil {
return nil, err
}
for _, d := range dirs {
name := filepath.Base(d.Name())
r.volumes[name] = &Volume{
driverName: r.Name(),
name: name,
path: filepath.Join(rootDirectory, name),
path: r.DataPath(name),
}
}
return r, nil
@ -36,10 +53,15 @@ func New(rootDirectory string) (*Root, error) {
type Root struct {
m sync.Mutex
scope string
path string
volumes map[string]*Volume
}
func (r *Root) DataPath(volumeName string) string {
return filepath.Join(r.path, volumeName, VolumeDataPathName)
}
func (r *Root) Name() string {
return "local"
}
@ -47,12 +69,13 @@ func (r *Root) Name() string {
func (r *Root) Create(name string) (volume.Volume, error) {
r.m.Lock()
defer r.m.Unlock()
v, exists := r.volumes[name]
if !exists {
path := filepath.Join(r.path, name)
if err := os.Mkdir(path, 0755); err != nil {
path := r.DataPath(name)
if err := os.MkdirAll(path, 0755); err != nil {
if os.IsExist(err) {
return nil, fmt.Errorf("volume already exists under %s", path)
return nil, fmt.Errorf("volume already exists under %s", filepath.Dir(path))
}
return nil, err
}
@ -76,12 +99,40 @@ func (r *Root) Remove(v volume.Volume) error {
}
lv.release()
if lv.usedCount == 0 {
realPath, err := filepath.EvalSymlinks(lv.path)
if err != nil {
return err
}
if !r.scopedPath(realPath) {
return fmt.Errorf("Unable to remove a directory of out the Docker root: %s", realPath)
}
if err := os.RemoveAll(realPath); err != nil {
return err
}
delete(r.volumes, lv.name)
return os.RemoveAll(lv.path)
return os.RemoveAll(filepath.Dir(lv.path))
}
return nil
}
// scopedPath verifies that the path where the volume is located
// is under Docker's root and the valid local paths.
func (r *Root) scopedPath(realPath string) bool {
// Volumes path for Docker version >= 1.7
if strings.HasPrefix(realPath, filepath.Join(r.scope, volumesPathName)) {
return true
}
// Volumes path for Docker version < 1.7
if strings.HasPrefix(realPath, filepath.Join(r.scope, oldVfsDir)) {
return true
}
return false
}
type Volume struct {
m sync.Mutex
usedCount int