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|
package shim
import (
"errors"
"io"
"log"
graphDriver "github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/containerfs"
"github.com/docker/docker/pkg/idtools"
graphPlugin "github.com/docker/go-plugins-helpers/graphdriver"
)
type shimDriver struct {
driver graphDriver.Driver
init graphDriver.InitFunc
}
// NewHandlerFromGraphDriver creates a plugin handler from an existing graph
// driver. This could be used, for instance, by the `overlayfs` graph driver
// built-in to Docker Engine and it would create a plugin from it that maps
// plugin API calls directly to any volume driver that satifies the
// graphdriver.Driver interface from Docker Engine.
func NewHandlerFromGraphDriver(init graphDriver.InitFunc) *graphPlugin.Handler {
return graphPlugin.NewHandler(&shimDriver{driver: nil, init: init})
}
func (d *shimDriver) Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) error {
driver, err := d.init(home, options, uidMaps, gidMaps)
if err != nil {
return err
}
d.driver = driver
return nil
}
var errNotInitialized = errors.New("Not initialized")
func (d *shimDriver) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
if d == nil {
return errNotInitialized
}
opts := graphDriver.CreateOpts{
MountLabel: mountLabel,
StorageOpt: storageOpt,
}
return d.driver.Create(id, parent, &opts)
}
func (d *shimDriver) CreateReadWrite(id, parent, mountLabel string, storageOpt map[string]string) error {
if d == nil {
return errNotInitialized
}
opts := graphDriver.CreateOpts{
MountLabel: mountLabel,
StorageOpt: storageOpt,
}
return d.driver.CreateReadWrite(id, parent, &opts)
}
func (d *shimDriver) Remove(id string) error {
if d == nil {
return errNotInitialized
}
return d.driver.Remove(id)
}
func (d *shimDriver) Get(id, mountLabel string) (containerfs.ContainerFS, error) {
if d == nil {
return nil, errNotInitialized
}
return d.driver.Get(id, mountLabel)
}
func (d *shimDriver) Put(id string) error {
if d == nil {
return errNotInitialized
}
return d.driver.Put(id)
}
func (d *shimDriver) Exists(id string) bool {
if d == nil {
return false
}
return d.driver.Exists(id)
}
func (d *shimDriver) Status() [][2]string {
if d == nil {
return nil
}
return d.driver.Status()
}
func (d *shimDriver) GetMetadata(id string) (map[string]string, error) {
if d == nil {
return nil, errNotInitialized
}
return d.driver.GetMetadata(id)
}
func (d *shimDriver) Cleanup() error {
if d == nil {
return errNotInitialized
}
return d.driver.Cleanup()
}
func (d *shimDriver) Diff(id, parent string) io.ReadCloser {
if d == nil {
return nil
}
// FIXME(samoht): how do we pass the error to the driver?
archive, err := d.driver.Diff(id, parent)
if err != nil {
log.Fatalf("Diff: error in stream %v", err)
}
return archive
}
func changeKind(c archive.ChangeType) graphPlugin.ChangeKind {
switch c {
case archive.ChangeModify:
return graphPlugin.Modified
case archive.ChangeAdd:
return graphPlugin.Added
case archive.ChangeDelete:
return graphPlugin.Deleted
}
return 0
}
func (d *shimDriver) Changes(id, parent string) ([]graphPlugin.Change, error) {
if d == nil {
return nil, errNotInitialized
}
cs, err := d.driver.Changes(id, parent)
if err != nil {
return nil, err
}
changes := make([]graphPlugin.Change, len(cs))
for _, c := range cs {
change := graphPlugin.Change{
Path: c.Path,
Kind: changeKind(c.Kind),
}
changes = append(changes, change)
}
return changes, nil
}
func (d *shimDriver) ApplyDiff(id, parent string, archive io.Reader) (int64, error) {
if d == nil {
return 0, errNotInitialized
}
return d.driver.ApplyDiff(id, parent, archive)
}
func (d *shimDriver) DiffSize(id, parent string) (int64, error) {
if d == nil {
return 0, errNotInitialized
}
return d.driver.DiffSize(id, parent)
}
func (d *shimDriver) Capabilities() graphDriver.Capabilities {
if d == nil {
return graphDriver.Capabilities{}
}
if capDriver, ok := d.driver.(graphDriver.CapabilityDriver); ok {
return capDriver.Capabilities()
}
return graphDriver.Capabilities{}
}
|
