// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
// The layer should be mounted when calling this function
func (d *Driver) Diff(id, parent string) (_ archive.Archive, err error) {
rID, err := d.resolveID(id)
if err != nil {
return
}
layerChain, err := d.getLayerChain(rID)
if err != nil {
return
}
// this is assuming that the layer is unmounted
if err := hcsshim.UnprepareLayer(d.info, rID); err != nil {
return nil, err
}
prepare := func() {
if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
}
}
arch, err := d.exportLayer(rID, layerChain)
if err != nil {
prepare()
return
}
return ioutils.NewReadCloserWrapper(arch, func() error {
err := arch.Close()
prepare()
return err
}), nil
}
// Returns: LayerFolderPaht, VolumePath
func CreateAndActivateContainerLayer(di hcsshim.DriverInfo, containerLayerId, parentLayerPath string) (string, string, error) {
var err error
parentLayerId := GetLayerId(parentLayerPath)
log.Printf("Parent layer %v path has Id %v", parentLayerPath, parentLayerId)
err = hcsshim.CreateSandboxLayer(di, containerLayerId, parentLayerPath, []string{parentLayerPath})
if err != nil {
return "", "", err
}
err = hcsshim.ActivateLayer(di, containerLayerId)
if err != nil {
return "", "", err
}
err = hcsshim.PrepareLayer(di, containerLayerId, []string{parentLayerPath})
if err != nil {
return "", "", err
}
volumeMountPath, err := hcsshim.GetLayerMountPath(di, containerLayerId)
if err != nil {
return "", "", err
}
log.Printf("Container layer volume path %v", volumeMountPath)
return GetLayerPath(di, containerLayerId), volumeMountPath, nil
}
// Get returns the rootfs path for the id. This will mount the dir at it's given path.
func (d *Driver) Get(id, mountLabel string) (string, error) {
logrus.Debugf("WindowsGraphDriver Get() id %s mountLabel %s", id, mountLabel)
var dir string
rID, err := d.resolveID(id)
if err != nil {
return "", err
}
if count := d.ctr.Increment(rID); count > 1 {
return d.cache[rID], nil
}
// Getting the layer paths must be done outside of the lock.
layerChain, err := d.getLayerChain(rID)
if err != nil {
d.ctr.Decrement(rID)
return "", err
}
if err := hcsshim.ActivateLayer(d.info, rID); err != nil {
d.ctr.Decrement(rID)
return "", err
}
if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
d.ctr.Decrement(rID)
if err2 := hcsshim.DeactivateLayer(d.info, rID); err2 != nil {
logrus.Warnf("Failed to Deactivate %s: %s", id, err)
}
return "", err
}
mountPath, err := hcsshim.GetLayerMountPath(d.info, rID)
if err != nil {
d.ctr.Decrement(rID)
if err2 := hcsshim.DeactivateLayer(d.info, rID); err2 != nil {
logrus.Warnf("Failed to Deactivate %s: %s", id, err)
}
return "", err
}
d.cacheMu.Lock()
d.cache[rID] = mountPath
d.cacheMu.Unlock()
// If the layer has a mount path, use that. Otherwise, use the
// folder path.
if mountPath != "" {
dir = mountPath
} else {
dir = d.dir(id)
}
return dir, nil
}
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (d *Driver) Diff(id, parent string) (_ archive.Archive, err error) {
rID, err := d.resolveID(id)
if err != nil {
return
}
// Getting the layer paths must be done outside of the lock.
layerChain, err := d.getLayerChain(rID)
if err != nil {
return
}
var undo func()
d.Lock()
// To support export, a layer must be activated but not prepared.
if d.info.Flavour == filterDriver {
if d.active[rID] == 0 {
if err = hcsshim.ActivateLayer(d.info, rID); err != nil {
d.Unlock()
return
}
undo = func() {
if err := hcsshim.DeactivateLayer(d.info, rID); err != nil {
logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
}
}
} else {
if err = hcsshim.UnprepareLayer(d.info, rID); err != nil {
d.Unlock()
return
}
undo = func() {
if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
logrus.Warnf("Failed to re-PrepareLayer %s: %s", rID, err)
}
}
}
}
d.Unlock()
arch, err := d.exportLayer(rID, layerChain)
if err != nil {
undo()
return
}
return ioutils.NewReadCloserWrapper(arch, func() error {
defer undo()
return arch.Close()
}), nil
}
// Changes produces a list of changes between the specified layer
// and its parent layer. If parent is "", then all changes will be ADD changes.
// The layer should be mounted when calling this function
func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {
rID, err := d.resolveID(id)
if err != nil {
return nil, err
}
parentChain, err := d.getLayerChain(rID)
if err != nil {
return nil, err
}
// this is assuming that the layer is unmounted
if err := hcsshim.UnprepareLayer(d.info, rID); err != nil {
return nil, err
}
defer func() {
if err := hcsshim.PrepareLayer(d.info, rID, parentChain); err != nil {
logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
}
}()
var changes []archive.Change
err = winio.RunWithPrivilege(winio.SeBackupPrivilege, func() error {
r, err := hcsshim.NewLayerReader(d.info, id, parentChain)
if err != nil {
return err
}
defer r.Close()
for {
name, _, fileInfo, err := r.Next()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
name = filepath.ToSlash(name)
if fileInfo == nil {
changes = append(changes, archive.Change{Path: name, Kind: archive.ChangeDelete})
} else {
// Currently there is no way to tell between an add and a modify.
changes = append(changes, archive.Change{Path: name, Kind: archive.ChangeModify})
}
}
})
if err != nil {
return nil, err
}
return changes, nil
}
// Get returns the rootfs path for the id. This will mount the dir at it's given path
func (d *Driver) Get(id, mountLabel string) (string, error) {
logrus.Debugf("WindowsGraphDriver Get() id %s mountLabel %s", id, mountLabel)
var dir string
d.Lock()
defer d.Unlock()
rId, err := d.resolveId(id)
if err != nil {
return "", err
}
// Getting the layer paths must be done outside of the lock.
layerChain, err := d.getLayerChain(rId)
if err != nil {
return "", err
}
if d.active[rId] == 0 {
if err := hcsshim.ActivateLayer(d.info, rId); err != nil {
return "", err
}
if err := hcsshim.PrepareLayer(d.info, rId, layerChain); err != nil {
if err2 := hcsshim.DeactivateLayer(d.info, rId); err2 != nil {
logrus.Warnf("Failed to Deactivate %s: %s", id, err)
}
return "", err
}
}
mountPath, err := hcsshim.GetLayerMountPath(d.info, rId)
if err != nil {
if err2 := hcsshim.DeactivateLayer(d.info, rId); err2 != nil {
logrus.Warnf("Failed to Deactivate %s: %s", id, err)
}
return "", err
}
d.active[rId]++
// If the layer has a mount path, use that. Otherwise, use the
// folder path.
if mountPath != "" {
dir = mountPath
} else {
dir = d.dir(id)
}
return dir, nil
}
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (d *Driver) Diff(id, parent string) (arch archive.Archive, err error) {
rID, err := d.resolveID(id)
if err != nil {
return
}
// Getting the layer paths must be done outside of the lock.
layerChain, err := d.getLayerChain(rID)
if err != nil {
return
}
d.Lock()
// To support export, a layer must be activated but not prepared.
if d.info.Flavour == filterDriver {
if d.active[rID] == 0 {
if err = hcsshim.ActivateLayer(d.info, rID); err != nil {
d.Unlock()
return
}
defer func() {
if err := hcsshim.DeactivateLayer(d.info, rID); err != nil {
logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
}
}()
} else {
if err = hcsshim.UnprepareLayer(d.info, rID); err != nil {
d.Unlock()
return
}
defer func() {
if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
logrus.Warnf("Failed to re-PrepareLayer %s: %s", rID, err)
}
}()
}
}
d.Unlock()
return d.exportLayer(rID, layerChain)
}
func GetLayerPath2(di hcsshim.DriverInfo, layerId, parentLayerPath string) (string, error) {
parentLayerId := GetLayerId(parentLayerPath)
err := hcsshim.CreateLayer(di, layerId, parentLayerId)
if err != nil {
return "", err
}
err = hcsshim.ActivateLayer(di, layerId)
if err != nil {
return "", err
}
err = hcsshim.PrepareLayer(di, layerId, []string{parentLayerPath})
if err != nil {
return "", err
}
layerFolderPath, err := hcsshim.GetLayerMountPath(di, layerId)
if err != nil {
return "", err
}
log.Printf("Container layer folder path %v", layerFolderPath)
err = hcsshim.UnprepareLayer(di, layerId)
if err != nil {
return "", err
}
err = hcsshim.DeactivateLayer(di, layerId)
if err != nil {
return "", err
}
err = hcsshim.DestroyLayer(di, layerId)
if err != nil {
return "", err
}
return layerFolderPath, nil
}
func (container *Container) PrepareStorage() error {
if wd, ok := container.daemon.driver.(*windows.WindowsGraphDriver); ok {
// Get list of paths to parent layers.
var ids []string
if container.ImageID != "" {
img, err := container.daemon.graph.Get(container.ImageID)
if err != nil {
return err
}
ids, err = container.daemon.graph.ParentLayerIds(img)
if err != nil {
return err
}
}
if err := hcsshim.PrepareLayer(wd.Info(), container.ID, wd.LayerIdsToPaths(ids)); err != nil {
return err
}
}
return nil
}
// Changes produces a list of changes between the specified layer
// and its parent layer. If parent is "", then all changes will be ADD changes.
func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {
rID, err := d.resolveID(id)
if err != nil {
return nil, err
}
parentChain, err := d.getLayerChain(rID)
if err != nil {
return nil, err
}
d.Lock()
if d.info.Flavour == filterDriver {
if d.active[rID] == 0 {
if err = hcsshim.ActivateLayer(d.info, rID); err != nil {
d.Unlock()
return nil, err
}
defer func() {
if err := hcsshim.DeactivateLayer(d.info, rID); err != nil {
logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
}
}()
} else {
if err = hcsshim.UnprepareLayer(d.info, rID); err != nil {
d.Unlock()
return nil, err
}
defer func() {
if err := hcsshim.PrepareLayer(d.info, rID, parentChain); err != nil {
logrus.Warnf("Failed to re-PrepareLayer %s: %s", rID, err)
}
}()
}
}
d.Unlock()
r, err := hcsshim.NewLayerReader(d.info, id, parentChain)
if err != nil {
return nil, err
}
defer r.Close()
var changes []archive.Change
for {
name, _, fileInfo, err := r.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
name = filepath.ToSlash(name)
if fileInfo == nil {
changes = append(changes, archive.Change{name, archive.ChangeDelete})
} else {
// Currently there is no way to tell between an add and a modify.
changes = append(changes, archive.Change{name, archive.ChangeModify})
}
}
return changes, nil
}