// createContainerPlatformSpecificSettings performs platform specific container create functionality
func (daemon *Daemon) createContainerPlatformSpecificSettings(container *container.Container, config *runconfig.Config, hostConfig *runconfig.HostConfig, img *image.Image) error {
if err := daemon.Mount(container); err != nil {
return err
}
defer daemon.Unmount(container)
for spec := range config.Volumes {
name := stringid.GenerateNonCryptoID()
destination := filepath.Clean(spec)
// Skip volumes for which we already have something mounted on that
// destination because of a --volume-from.
if container.IsDestinationMounted(destination) {
continue
}
path, err := container.GetResourcePath(destination)
if err != nil {
return err
}
stat, err := os.Stat(path)
if err == nil && !stat.IsDir() {
return derr.ErrorCodeMountOverFile.WithArgs(path)
}
volumeDriver := hostConfig.VolumeDriver
if destination != "" && img != nil {
if _, ok := img.ContainerConfig.Volumes[destination]; ok {
// check for whether bind is not specified and then set to local
if _, ok := container.MountPoints[destination]; !ok {
volumeDriver = volume.DefaultDriverName
}
}
}
v, err := daemon.createVolume(name, volumeDriver, nil)
if err != nil {
return err
}
if err := label.Relabel(v.Path(), container.MountLabel, true); err != nil {
return err
}
// never attempt to copy existing content in a container FS to a shared volume
if v.DriverName() == volume.DefaultDriverName {
if err := container.CopyImagePathContent(v, destination); err != nil {
return err
}
}
container.AddMountPointWithVolume(destination, v, true)
}
return nil
}
// 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.Container) error {
// 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.
type volumes struct {
Volumes map[string]string
VolumesRW map[string]bool
}
cfgPath, err := container.ConfigPath()
if err != nil {
return err
}
f, err := os.Open(cfgPath)
if err != nil {
return errors.Wrap(err, "could not open container config")
}
defer f.Close()
var cv volumes
if err := json.NewDecoder(f).Decode(&cv); err != nil {
return errors.Wrap(err, "could not decode container config")
}
if len(container.MountPoints) == 0 && len(cv.Volumes) > 0 {
for destination, hostPath := range cv.Volumes {
vfsPath := filepath.Join(daemon.root, "vfs", "dir")
rw := cv.VolumesRW != nil && cv.VolumesRW[destination]
if strings.HasPrefix(hostPath, vfsPath) {
id := filepath.Base(hostPath)
v, err := daemon.volumes.CreateWithRef(id, volume.DefaultDriverName, container.ID, nil, nil)
if err != nil {
return err
}
if err := migrateVolume(id, hostPath); err != nil {
return err
}
container.AddMountPointWithVolume(destination, v, true)
} else { // Bind mount
m := volume.MountPoint{Source: hostPath, Destination: destination, RW: rw}
container.MountPoints[destination] = &m
}
}
return container.ToDisk()
}
return nil
}
// createContainerPlatformSpecificSettings performs platform specific container create functionality
func (daemon *Daemon) createContainerPlatformSpecificSettings(container *container.Container, config *containertypes.Config, hostConfig *containertypes.HostConfig) error {
if err := daemon.Mount(container); err != nil {
return err
}
defer daemon.Unmount(container)
rootUID, rootGID := daemon.GetRemappedUIDGID()
if err := container.SetupWorkingDirectory(rootUID, rootGID); err != nil {
return err
}
for spec := range config.Volumes {
name := stringid.GenerateNonCryptoID()
destination := filepath.Clean(spec)
// Skip volumes for which we already have something mounted on that
// destination because of a --volume-from.
if container.IsDestinationMounted(destination) {
continue
}
path, err := container.GetResourcePath(destination)
if err != nil {
return err
}
stat, err := os.Stat(path)
if err == nil && !stat.IsDir() {
return fmt.Errorf("cannot mount volume over existing file, file exists %s", path)
}
v, err := daemon.volumes.CreateWithRef(name, hostConfig.VolumeDriver, container.ID, nil, nil)
if err != nil {
return err
}
if err := label.Relabel(v.Path(), container.MountLabel, true); err != nil {
return err
}
container.AddMountPointWithVolume(destination, v, true)
}
return daemon.populateVolumes(container)
}
// createContainerPlatformSpecificSettings performs platform specific container create functionality
func (daemon *Daemon) createContainerPlatformSpecificSettings(container *container.Container, config *containertypes.Config, hostConfig *containertypes.HostConfig) error {
for spec := range config.Volumes {
mp, err := volume.ParseMountSpec(spec, hostConfig.VolumeDriver)
if err != nil {
return fmt.Errorf("Unrecognised volume spec: %v", err)
}
// If the mountpoint doesn't have a name, generate one.
if len(mp.Name) == 0 {
mp.Name = stringid.GenerateNonCryptoID()
}
// Skip volumes for which we already have something mounted on that
// destination because of a --volume-from.
if container.IsDestinationMounted(mp.Destination) {
continue
}
volumeDriver := hostConfig.VolumeDriver
// Create the volume in the volume driver. If it doesn't exist,
// a new one will be created.
v, err := daemon.volumes.CreateWithRef(mp.Name, volumeDriver, container.ID, nil, nil)
if err != nil {
return err
}
// FIXME Windows: This code block is present in the Linux version and
// allows the contents to be copied to the container FS prior to it
// being started. However, the function utilizes the FollowSymLinkInScope
// path which does not cope with Windows volume-style file paths. There
// is a separate effort to resolve this (@swernli), so this processing
// is deferred for now. A case where this would be useful is when
// a dockerfile includes a VOLUME statement, but something is created
// in that directory during the dockerfile processing. What this means
// on Windows for TP5 is that in that scenario, the contents will not
// copied, but that's (somewhat) OK as HCS will bomb out soon after
// at it doesn't support mapped directories which have contents in the
// destination path anyway.
//
// Example for repro later:
// FROM windowsservercore
// RUN mkdir c:\myvol
// RUN copy c:\windows\system32\ntdll.dll c:\myvol
// VOLUME "c:\myvol"
//
// Then
// docker build -t vol .
// docker run -it --rm vol cmd <-- This is where HCS will error out.
//
// // never attempt to copy existing content in a container FS to a shared volume
// if v.DriverName() == volume.DefaultDriverName {
// if err := container.CopyImagePathContent(v, mp.Destination); err != nil {
// return err
// }
// }
// Add it to container.MountPoints
container.AddMountPointWithVolume(mp.Destination, v, mp.RW)
}
return nil
}