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