package daemon import ( "encoding/json" "fmt" "io" "runtime" "strings" "time" "github.com/docker/distribution/reference" "github.com/docker/docker/api/types/backend" containertypes "github.com/docker/docker/api/types/container" "github.com/docker/docker/builder/dockerfile" "github.com/docker/docker/container" "github.com/docker/docker/image" "github.com/docker/docker/layer" "github.com/docker/docker/pkg/ioutils" "github.com/pkg/errors" ) // 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 { 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 runtime.GOOS == "windows" { // Case insensitive environment variables on Windows imageEnvKey = strings.ToUpper(imageEnvKey) userEnvKey = strings.ToUpper(userEnvKey) } if imageEnvKey == userEnvKey { found = true break } } if !found { userConf.Env = append(userConf.Env, imageEnv) } } } if userConf.Labels == nil { userConf.Labels = map[string]string{} } for l, v := range imageConf.Labels { if _, ok := userConf.Labels[l]; !ok { userConf.Labels[l] = v } } 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.StartPeriod == 0 { userConf.Healthcheck.StartPeriod = imageConf.Healthcheck.StartPeriod } 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) { start := time.Now() 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 "", errors.Errorf("%+v does not support commit of a running container", runtime.GOOS) } if container.IsDead() { err := fmt.Errorf("You cannot commit container %s which is Dead", container.ID) return "", stateConflictError{err} } if container.IsRemovalInProgress() { err := fmt.Errorf("You cannot commit container %s which is being removed", container.ID) return "", stateConflictError{err} } 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 parent *image.Image if container.ImageID == "" { parent = new(image.Image) parent.RootFS = image.NewRootFS() } else { parent, err = daemon.stores[container.OS].imageStore.Get(container.ImageID) if err != nil { return "", err } } l, err := daemon.stores[container.OS].layerStore.Register(rwTar, parent.RootFS.ChainID(), layer.OS(container.OS)) if err != nil { return "", err } defer layer.ReleaseAndLog(daemon.stores[container.OS].layerStore, l) containerConfig := c.ContainerConfig if containerConfig == nil { containerConfig = container.Config } cc := image.ChildConfig{ ContainerID: container.ID, Author: c.Author, Comment: c.Comment, ContainerConfig: containerConfig, Config: newConfig, DiffID: l.DiffID(), } config, err := json.Marshal(image.NewChildImage(parent, cc, container.OS)) if err != nil { return "", err } id, err := daemon.stores[container.OS].imageStore.Create(config) if err != nil { return "", err } if container.ImageID != "" { if err := daemon.stores[container.OS].imageStore.SetParent(id, container.ImageID); err != nil { return "", err } } imageRef := "" if c.Repo != "" { newTag, err := reference.ParseNormalizedNamed(c.Repo) // todo: should move this to API layer if err != nil { return "", err } if !reference.IsNameOnly(newTag) { return "", errors.Errorf("unexpected repository name: %s", c.Repo) } if c.Tag != "" { if newTag, err = reference.WithTag(newTag, c.Tag); err != nil { return "", err } } if err := daemon.TagImageWithReference(id, container.OS, newTag); err != nil { return "", err } imageRef = reference.FamiliarString(newTag) } attributes := map[string]string{ "comment": c.Comment, "imageID": id.String(), "imageRef": imageRef, } daemon.LogContainerEventWithAttributes(container, "commit", attributes) containerActions.WithValues("commit").UpdateSince(start) return id.String(), nil } func (daemon *Daemon) exportContainerRw(container *container.Container) (arch io.ReadCloser, err error) { rwlayer, err := daemon.stores[container.OS].layerStore.GetRWLayer(container.ID) if err != nil { return nil, err } defer func() { if err != nil { daemon.stores[container.OS].layerStore.ReleaseRWLayer(rwlayer) } }() // TODO: this mount call is not necessary as we assume that TarStream() should // mount the layer if needed. But the Diff() function for windows requests that // the layer should be mounted when calling it. So we reserve this mount call // until windows driver can implement Diff() interface correctly. _, err = rwlayer.Mount(container.GetMountLabel()) if err != nil { return nil, err } archive, err := rwlayer.TarStream() if err != nil { rwlayer.Unmount() return nil, err } return ioutils.NewReadCloserWrapper(archive, func() error { archive.Close() err = rwlayer.Unmount() daemon.stores[container.OS].layerStore.ReleaseRWLayer(rwlayer) return err }), nil }