package daemon import ( "encoding/json" "fmt" "runtime" "strings" "time" "github.com/docker/docker/api/types" "github.com/docker/docker/container" "github.com/docker/docker/dockerversion" "github.com/docker/docker/image" "github.com/docker/docker/layer" "github.com/docker/docker/pkg/archive" "github.com/docker/docker/pkg/ioutils" "github.com/docker/docker/reference" "github.com/docker/docker/runconfig" ) // Commit creates a new filesystem image from the current state of a container. // The image can optionally be tagged into a repository. func (daemon *Daemon) Commit(name string, c *types.ContainerCommitConfig) (string, error) { container, err := daemon.GetContainer(name) if err != nil { return "", err } // It is not possible to commit a running container on Windows if runtime.GOOS == "windows" && container.IsRunning() { return "", fmt.Errorf("Windows does not support commit of a running container") } if c.Pause && !container.IsPaused() { daemon.containerPause(container) defer daemon.containerUnpause(container) } if c.MergeConfigs { if err := runconfig.Merge(c.Config, container.Config); err != nil { return "", err } } rwTar, err := daemon.exportContainerRw(container) if err != nil { return "", err } defer func() { if rwTar != nil { rwTar.Close() } }() var history []image.History rootFS := image.NewRootFS() if container.ImageID != "" { img, err := daemon.imageStore.Get(container.ImageID) if err != nil { return "", err } history = img.History rootFS = img.RootFS } l, err := daemon.layerStore.Register(rwTar, rootFS.ChainID()) if err != nil { return "", err } defer layer.ReleaseAndLog(daemon.layerStore, l) h := image.History{ Author: c.Author, Created: time.Now().UTC(), CreatedBy: strings.Join(container.Config.Cmd.Slice(), " "), Comment: c.Comment, EmptyLayer: true, } if diffID := l.DiffID(); layer.DigestSHA256EmptyTar != diffID { h.EmptyLayer = false rootFS.Append(diffID) } history = append(history, h) config, err := json.Marshal(&image.Image{ V1Image: image.V1Image{ DockerVersion: dockerversion.Version, Config: c.Config, Architecture: runtime.GOARCH, OS: runtime.GOOS, Container: container.ID, ContainerConfig: *container.Config, Author: c.Author, Created: h.Created, }, RootFS: rootFS, History: history, }) if err != nil { return "", err } id, err := daemon.imageStore.Create(config) if err != nil { return "", err } if container.ImageID != "" { if err := daemon.imageStore.SetParent(id, container.ImageID); err != nil { return "", err } } if c.Repo != "" { newTag, err := reference.WithName(c.Repo) // todo: should move this to API layer if err != nil { return "", err } if c.Tag != "" { if newTag, err = reference.WithTag(newTag, c.Tag); err != nil { return "", err } } if err := daemon.TagImage(newTag, id.String()); err != nil { return "", err } } daemon.LogContainerEvent(container, "commit") return id.String(), nil } func (daemon *Daemon) exportContainerRw(container *container.Container) (archive.Archive, error) { if err := daemon.Mount(container); err != nil { return nil, err } archive, err := container.RWLayer.TarStream() if err != nil { return nil, err } return ioutils.NewReadCloserWrapper(archive, func() error { archive.Close() return daemon.layerStore.Unmount(container.ID) }), nil }