package daemon import ( "encoding/json" "fmt" "runtime" "strings" "time" "github.com/docker/docker/api/types/backend" "github.com/docker/docker/builder/dockerfile" "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" containertypes "github.com/docker/engine-api/types/container" "github.com/docker/go-connections/nat" ) // merge merges two Config, the image container configuration (defaults values), // and the user container configuration, either passed by the API or generated // by the cli. // It will mutate the specified user configuration (userConf) with the image // configuration where the user configuration is incomplete. func merge(userConf, imageConf *containertypes.Config) error { if userConf.User == "" { userConf.User = imageConf.User } if len(userConf.ExposedPorts) == 0 { userConf.ExposedPorts = imageConf.ExposedPorts } else if imageConf.ExposedPorts != nil { if userConf.ExposedPorts == nil { userConf.ExposedPorts = make(nat.PortSet) } for port := range imageConf.ExposedPorts { if _, exists := userConf.ExposedPorts[port]; !exists { userConf.ExposedPorts[port] = struct{}{} } } } if len(userConf.Env) == 0 { userConf.Env = imageConf.Env } else { for _, imageEnv := range imageConf.Env { found := false imageEnvKey := strings.Split(imageEnv, "=")[0] for _, userEnv := range userConf.Env { userEnvKey := strings.Split(userEnv, "=")[0] if imageEnvKey == userEnvKey { found = true break } } if !found { userConf.Env = append(userConf.Env, imageEnv) } } } if userConf.Labels == nil { userConf.Labels = map[string]string{} } if imageConf.Labels != nil { for l := range userConf.Labels { imageConf.Labels[l] = userConf.Labels[l] } userConf.Labels = imageConf.Labels } if len(userConf.Entrypoint) == 0 { if len(userConf.Cmd) == 0 { userConf.Cmd = imageConf.Cmd userConf.ArgsEscaped = imageConf.ArgsEscaped } if userConf.Entrypoint == nil { userConf.Entrypoint = imageConf.Entrypoint } } if imageConf.Healthcheck != nil { if userConf.Healthcheck == nil { userConf.Healthcheck = imageConf.Healthcheck } else { if len(userConf.Healthcheck.Test) == 0 { userConf.Healthcheck.Test = imageConf.Healthcheck.Test } if userConf.Healthcheck.Interval == 0 { userConf.Healthcheck.Interval = imageConf.Healthcheck.Interval } if userConf.Healthcheck.Timeout == 0 { userConf.Healthcheck.Timeout = imageConf.Healthcheck.Timeout } if userConf.Healthcheck.Retries == 0 { userConf.Healthcheck.Retries = imageConf.Healthcheck.Retries } } } if userConf.WorkingDir == "" { userConf.WorkingDir = imageConf.WorkingDir } if len(userConf.Volumes) == 0 { userConf.Volumes = imageConf.Volumes } else { for k, v := range imageConf.Volumes { userConf.Volumes[k] = v } } if userConf.StopSignal == "" { userConf.StopSignal = imageConf.StopSignal } return nil } // 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 *backend.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) } newConfig, err := dockerfile.BuildFromConfig(c.Config, c.Changes) if err != nil { return "", err } if c.MergeConfigs { if err := merge(newConfig, 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() osVersion := "" var osFeatures []string if container.ImageID != "" { img, err := daemon.imageStore.Get(container.ImageID) if err != nil { return "", err } history = img.History rootFS = img.RootFS osVersion = img.OSVersion osFeatures = img.OSFeatures } 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, " "), 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: newConfig, Architecture: runtime.GOARCH, OS: runtime.GOOS, Container: container.ID, ContainerConfig: *container.Config, Author: c.Author, Created: h.Created, }, RootFS: rootFS, History: history, OSFeatures: osFeatures, OSVersion: osVersion, }) 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.TagImageWithReference(id, newTag); err != nil { return "", err } } attributes := map[string]string{ "comment": c.Comment, } daemon.LogContainerEventWithAttributes(container, "commit", attributes) 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 { daemon.Unmount(container) // logging is already handled in the `Unmount` function return nil, err } return ioutils.NewReadCloserWrapper(archive, func() error { archive.Close() return container.RWLayer.Unmount() }), nil }