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windows.go
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windows.go
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//+build windows
package windows
import (
"fmt"
"os"
"path/filepath"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/chrootarchive"
"github.com/docker/docker/pkg/ioutils"
"github.com/microsoft/hcsshim"
)
func init() {
graphdriver.Register("windowsfilter", InitFilter)
graphdriver.Register("windowsdiff", InitDiff)
}
const (
diffDriver = iota
filterDriver
)
type WindowsGraphDriver struct {
info hcsshim.DriverInfo
sync.Mutex // Protects concurrent modification to active
active map[string]int
}
// New returns a new Windows storage filter driver.
func InitFilter(home string, options []string) (graphdriver.Driver, error) {
logrus.Debugf("WindowsGraphDriver InitFilter at %s", home)
d := &WindowsGraphDriver{
info: hcsshim.DriverInfo{
HomeDir: home,
Flavour: filterDriver,
},
active: make(map[string]int),
}
return d, nil
}
// New returns a new Windows differencing disk driver.
func InitDiff(home string, options []string) (graphdriver.Driver, error) {
logrus.Debugf("WindowsGraphDriver InitDiff at %s", home)
d := &WindowsGraphDriver{
info: hcsshim.DriverInfo{
HomeDir: home,
Flavour: diffDriver,
},
active: make(map[string]int),
}
return d, nil
}
func (d *WindowsGraphDriver) Info() hcsshim.DriverInfo {
return d.info
}
func (d *WindowsGraphDriver) String() string {
switch d.info.Flavour {
case diffDriver:
return "windowsdiff"
case filterDriver:
return "windowsfilter"
default:
return "Unknown driver flavour"
}
}
func (d *WindowsGraphDriver) Status() [][2]string {
return [][2]string{
{"Windows", ""},
}
}
// Exists returns true if the given id is registered with
// this driver
func (d *WindowsGraphDriver) Exists(id string) bool {
result, err := hcsshim.LayerExists(d.info, id)
if err != nil {
return false
}
return result
}
func (d *WindowsGraphDriver) Create(id, parent string) error {
return hcsshim.CreateLayer(d.info, id, parent)
}
func (d *WindowsGraphDriver) dir(id string) string {
return filepath.Join(d.info.HomeDir, filepath.Base(id))
}
// Remove unmounts and removes the dir information
func (d *WindowsGraphDriver) Remove(id string) error {
return hcsshim.DestroyLayer(d.info, id)
}
// Get returns the rootfs path for the id. This will mount the dir at it's given path
func (d *WindowsGraphDriver) Get(id, mountLabel string) (string, error) {
var dir string
d.Lock()
defer d.Unlock()
if d.active[id] == 0 {
if err := hcsshim.ActivateLayer(d.info, id); err != nil {
return "", err
}
}
mountPath, err := hcsshim.GetLayerMountPath(d.info, id)
if err != nil {
return "", err
}
// If the layer has a mount path, use that. Otherwise, use the
// folder path.
if mountPath != "" {
dir = mountPath
} else {
dir = d.dir(id)
}
d.active[id]++
return dir, nil
}
func (d *WindowsGraphDriver) Put(id string) error {
logrus.Debugf("WindowsGraphDriver Put() id %s", id)
d.Lock()
defer d.Unlock()
if d.active[id] > 1 {
d.active[id]--
} else if d.active[id] == 1 {
if err := hcsshim.DeactivateLayer(d.info, id); err != nil {
return err
}
delete(d.active, id)
}
return nil
}
func (d *WindowsGraphDriver) Cleanup() error {
return nil
}
// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (d *WindowsGraphDriver) Diff(id, parent string) (arch archive.Archive, err error) {
return nil, fmt.Errorf("The Windows graphdriver does not support Diff()")
}
// 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 *WindowsGraphDriver) Changes(id, parent string) ([]archive.Change, error) {
return nil, fmt.Errorf("The Windows graphdriver does not support Changes()")
}
// ApplyDiff extracts the changeset from the given diff into the
// layer with the specified id and parent, returning the size of the
// new layer in bytes.
func (d *WindowsGraphDriver) ApplyDiff(id, parent string, diff archive.ArchiveReader) (size int64, err error) {
start := time.Now().UTC()
logrus.Debugf("WindowsGraphDriver ApplyDiff: Start untar layer")
destination := d.dir(id)
if d.info.Flavour == diffDriver {
destination = filepath.Dir(destination)
}
if size, err = chrootarchive.ApplyLayer(destination, diff); err != nil {
return
}
logrus.Debugf("WindowsGraphDriver ApplyDiff: Untar time: %vs", time.Now().UTC().Sub(start).Seconds())
return
}
// DiffSize calculates the changes between the specified layer
// and its parent and returns the size in bytes of the changes
// relative to its base filesystem directory.
func (d *WindowsGraphDriver) DiffSize(id, parent string) (size int64, err error) {
changes, err := d.Changes(id, parent)
if err != nil {
return
}
layerFs, err := d.Get(id, "")
if err != nil {
return
}
defer d.Put(id)
return archive.ChangesSize(layerFs, changes), nil
}
func (d *WindowsGraphDriver) CopyDiff(sourceId, id string, parentLayerPaths []string) error {
d.Lock()
defer d.Unlock()
if d.info.Flavour == filterDriver && d.active[sourceId] == 0 {
if err := hcsshim.ActivateLayer(d.info, sourceId); err != nil {
return err
}
defer func() {
err := hcsshim.DeactivateLayer(d.info, sourceId)
if err != nil {
logrus.Warnf("Failed to Deactivate %s: %s", sourceId, err)
}
}()
}
return hcsshim.CopyLayer(d.info, sourceId, id, parentLayerPaths)
}
func (d *WindowsGraphDriver) LayerIdsToPaths(ids []string) []string {
var paths []string
for _, id := range ids {
path, err := d.Get(id, "")
if err != nil {
logrus.Debug("LayerIdsToPaths: Error getting mount path for id", id, ":", err.Error())
return nil
}
if d.Put(id) != nil {
logrus.Debug("LayerIdsToPaths: Error putting mount path for id", id, ":", err.Error())
return nil
}
paths = append(paths, path)
}
return paths
}
func (d *WindowsGraphDriver) GetMetadata(id string) (map[string]string, error) {
return nil, nil
}
func (d *WindowsGraphDriver) Export(id string, parentLayerPaths []string) (arch archive.Archive, err error) {
layerFs, err := d.Get(id, "")
if err != nil {
return
}
defer func() {
if err != nil {
d.Put(id)
}
}()
tempFolder := layerFs + "-temp"
if err = os.MkdirAll(tempFolder, 0755); err != nil {
logrus.Errorf("Could not create %s %s", tempFolder, err)
return
}
defer func() {
if err != nil {
if err2 := os.RemoveAll(tempFolder); err2 != nil {
logrus.Warnf("Couldn't clean-up tempFolder: %s %s", tempFolder, err2)
}
}
}()
if err = hcsshim.ExportLayer(d.info, id, tempFolder, parentLayerPaths); err != nil {
return
}
archive, err := archive.Tar(tempFolder, archive.Uncompressed)
if err != nil {
return
}
return ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
d.Put(id)
if err2 := os.RemoveAll(tempFolder); err2 != nil {
logrus.Warnf("Couldn't clean-up tempFolder: %s %s", tempFolder, err2)
}
return err
}), nil
}
func (d *WindowsGraphDriver) Import(id string, layerData archive.ArchiveReader, parentLayerPaths []string) (size int64, err error) {
layerFs, err := d.Get(id, "")
if err != nil {
return
}
defer func() {
if err != nil {
d.Put(id)
}
}()
tempFolder := layerFs + "-temp"
if err = os.MkdirAll(tempFolder, 0755); err != nil {
logrus.Errorf("Could not create %s %s", tempFolder, err)
return
}
defer func() {
if err2 := os.RemoveAll(tempFolder); err2 != nil {
logrus.Warnf("Couldn't clean-up tempFolder: %s %s", tempFolder, err2)
}
}()
start := time.Now().UTC()
logrus.Debugf("Start untar layer")
if size, err = chrootarchive.ApplyLayer(tempFolder, layerData); err != nil {
return
}
logrus.Debugf("Untar time: %vs", time.Now().UTC().Sub(start).Seconds())
if err = hcsshim.ImportLayer(d.info, id, tempFolder, parentLayerPaths); err != nil {
return
}
return
}