263 lines
6.3 KiB
Go
263 lines
6.3 KiB
Go
package graphdriver // import "github.com/docker/docker/daemon/graphdriver"
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import (
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"errors"
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"fmt"
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"io"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/containerfs"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/plugingetter"
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"github.com/docker/docker/pkg/plugins"
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)
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type graphDriverProxy struct {
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name string
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p plugingetter.CompatPlugin
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caps Capabilities
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client *plugins.Client
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}
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type graphDriverRequest struct {
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ID string `json:",omitempty"`
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Parent string `json:",omitempty"`
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MountLabel string `json:",omitempty"`
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StorageOpt map[string]string `json:",omitempty"`
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}
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type graphDriverResponse struct {
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Err string `json:",omitempty"`
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Dir string `json:",omitempty"`
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Exists bool `json:",omitempty"`
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Status [][2]string `json:",omitempty"`
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Changes []archive.Change `json:",omitempty"`
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Size int64 `json:",omitempty"`
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Metadata map[string]string `json:",omitempty"`
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Capabilities Capabilities `json:",omitempty"`
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}
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type graphDriverInitRequest struct {
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Home string
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Opts []string `json:"Opts"`
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idtools.IdentityMapping
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}
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func (d *graphDriverProxy) Init(home string, opts []string, idMap idtools.IdentityMapping) error {
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if !d.p.IsV1() {
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if cp, ok := d.p.(plugingetter.CountedPlugin); ok {
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// always acquire here, it will be cleaned up on daemon shutdown
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cp.Acquire()
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}
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}
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args := &graphDriverInitRequest{
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Home: home,
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Opts: opts,
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IdentityMapping: idMap,
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}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Init", args, &ret); err != nil {
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return err
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}
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if ret.Err != "" {
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return errors.New(ret.Err)
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}
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caps, err := d.fetchCaps()
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if err != nil {
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return err
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}
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d.caps = caps
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return nil
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}
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func (d *graphDriverProxy) fetchCaps() (Capabilities, error) {
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args := &graphDriverRequest{}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Capabilities", args, &ret); err != nil {
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if !plugins.IsNotFound(err) {
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return Capabilities{}, err
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}
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}
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return ret.Capabilities, nil
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}
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func (d *graphDriverProxy) String() string {
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return d.name
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}
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func (d *graphDriverProxy) Capabilities() Capabilities {
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return d.caps
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}
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func (d *graphDriverProxy) CreateReadWrite(id, parent string, opts *CreateOpts) error {
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return d.create("GraphDriver.CreateReadWrite", id, parent, opts)
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}
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func (d *graphDriverProxy) Create(id, parent string, opts *CreateOpts) error {
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return d.create("GraphDriver.Create", id, parent, opts)
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}
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func (d *graphDriverProxy) create(method, id, parent string, opts *CreateOpts) error {
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args := &graphDriverRequest{
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ID: id,
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Parent: parent,
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}
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if opts != nil {
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args.MountLabel = opts.MountLabel
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args.StorageOpt = opts.StorageOpt
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}
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var ret graphDriverResponse
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if err := d.client.Call(method, args, &ret); err != nil {
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return err
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}
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if ret.Err != "" {
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return errors.New(ret.Err)
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}
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return nil
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}
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func (d *graphDriverProxy) Remove(id string) error {
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args := &graphDriverRequest{ID: id}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Remove", args, &ret); err != nil {
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return err
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}
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if ret.Err != "" {
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return errors.New(ret.Err)
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}
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return nil
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}
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func (d *graphDriverProxy) Get(id, mountLabel string) (containerfs.ContainerFS, error) {
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args := &graphDriverRequest{
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ID: id,
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MountLabel: mountLabel,
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}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Get", args, &ret); err != nil {
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return "", err
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}
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var err error
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if ret.Err != "" {
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err = errors.New(ret.Err)
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}
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return containerfs.NewLocalContainerFS(d.p.ScopedPath(ret.Dir)), err
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}
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func (d *graphDriverProxy) Put(id string) error {
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args := &graphDriverRequest{ID: id}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Put", args, &ret); err != nil {
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return err
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}
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if ret.Err != "" {
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return errors.New(ret.Err)
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}
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return nil
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}
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func (d *graphDriverProxy) Exists(id string) bool {
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args := &graphDriverRequest{ID: id}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Exists", args, &ret); err != nil {
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return false
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}
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return ret.Exists
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}
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func (d *graphDriverProxy) Status() [][2]string {
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args := &graphDriverRequest{}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Status", args, &ret); err != nil {
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return nil
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}
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return ret.Status
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}
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func (d *graphDriverProxy) GetMetadata(id string) (map[string]string, error) {
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args := &graphDriverRequest{
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ID: id,
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}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.GetMetadata", args, &ret); err != nil {
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return nil, err
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}
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if ret.Err != "" {
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return nil, errors.New(ret.Err)
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}
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return ret.Metadata, nil
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}
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func (d *graphDriverProxy) Cleanup() error {
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if !d.p.IsV1() {
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if cp, ok := d.p.(plugingetter.CountedPlugin); ok {
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// always release
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defer cp.Release()
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}
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}
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args := &graphDriverRequest{}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Cleanup", args, &ret); err != nil {
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return nil
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}
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if ret.Err != "" {
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return errors.New(ret.Err)
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}
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return nil
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}
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func (d *graphDriverProxy) Diff(id, parent string) (io.ReadCloser, error) {
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args := &graphDriverRequest{
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ID: id,
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Parent: parent,
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}
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body, err := d.client.Stream("GraphDriver.Diff", args)
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if err != nil {
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return nil, err
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}
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return body, nil
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}
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func (d *graphDriverProxy) Changes(id, parent string) ([]archive.Change, error) {
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args := &graphDriverRequest{
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ID: id,
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Parent: parent,
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}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.Changes", args, &ret); err != nil {
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return nil, err
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}
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if ret.Err != "" {
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return nil, errors.New(ret.Err)
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}
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return ret.Changes, nil
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}
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func (d *graphDriverProxy) ApplyDiff(id, parent string, diff io.Reader) (int64, error) {
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var ret graphDriverResponse
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if err := d.client.SendFile(fmt.Sprintf("GraphDriver.ApplyDiff?id=%s&parent=%s", id, parent), diff, &ret); err != nil {
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return -1, err
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}
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if ret.Err != "" {
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return -1, errors.New(ret.Err)
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}
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return ret.Size, nil
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}
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func (d *graphDriverProxy) DiffSize(id, parent string) (int64, error) {
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args := &graphDriverRequest{
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ID: id,
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Parent: parent,
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}
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var ret graphDriverResponse
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if err := d.client.Call("GraphDriver.DiffSize", args, &ret); err != nil {
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return -1, err
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}
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if ret.Err != "" {
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return -1, errors.New(ret.Err)
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}
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return ret.Size, nil
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}
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