зеркало из https://github.com/microsoft/docker.git
265 строки
6.5 KiB
Go
265 строки
6.5 KiB
Go
package daemon
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import (
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"encoding/json"
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"fmt"
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"runtime"
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"strings"
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"time"
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"github.com/docker/docker/api/types/backend"
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"github.com/docker/docker/builder/dockerfile"
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"github.com/docker/docker/container"
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"github.com/docker/docker/dockerversion"
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"github.com/docker/docker/image"
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"github.com/docker/docker/layer"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/reference"
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containertypes "github.com/docker/engine-api/types/container"
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"github.com/docker/go-connections/nat"
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)
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// merge merges two Config, the image container configuration (defaults values),
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// and the user container configuration, either passed by the API or generated
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// by the cli.
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// It will mutate the specified user configuration (userConf) with the image
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// configuration where the user configuration is incomplete.
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func merge(userConf, imageConf *containertypes.Config) error {
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if userConf.User == "" {
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userConf.User = imageConf.User
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}
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if len(userConf.ExposedPorts) == 0 {
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userConf.ExposedPorts = imageConf.ExposedPorts
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} else if imageConf.ExposedPorts != nil {
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if userConf.ExposedPorts == nil {
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userConf.ExposedPorts = make(nat.PortSet)
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}
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for port := range imageConf.ExposedPorts {
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if _, exists := userConf.ExposedPorts[port]; !exists {
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userConf.ExposedPorts[port] = struct{}{}
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}
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}
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}
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if len(userConf.Env) == 0 {
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userConf.Env = imageConf.Env
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} else {
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for _, imageEnv := range imageConf.Env {
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found := false
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imageEnvKey := strings.Split(imageEnv, "=")[0]
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for _, userEnv := range userConf.Env {
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userEnvKey := strings.Split(userEnv, "=")[0]
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if imageEnvKey == userEnvKey {
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found = true
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break
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}
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}
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if !found {
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userConf.Env = append(userConf.Env, imageEnv)
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}
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}
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}
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if userConf.Labels == nil {
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userConf.Labels = map[string]string{}
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}
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if imageConf.Labels != nil {
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for l := range userConf.Labels {
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imageConf.Labels[l] = userConf.Labels[l]
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}
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userConf.Labels = imageConf.Labels
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}
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if len(userConf.Entrypoint) == 0 {
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if len(userConf.Cmd) == 0 {
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userConf.Cmd = imageConf.Cmd
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}
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if userConf.Entrypoint == nil {
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userConf.Entrypoint = imageConf.Entrypoint
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}
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}
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if imageConf.Healthcheck != nil {
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if userConf.Healthcheck == nil {
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userConf.Healthcheck = imageConf.Healthcheck
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} else {
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if len(userConf.Healthcheck.Test) == 0 {
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userConf.Healthcheck.Test = imageConf.Healthcheck.Test
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}
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if userConf.Healthcheck.Interval == 0 {
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userConf.Healthcheck.Interval = imageConf.Healthcheck.Interval
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}
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if userConf.Healthcheck.Timeout == 0 {
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userConf.Healthcheck.Timeout = imageConf.Healthcheck.Timeout
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}
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if userConf.Healthcheck.Retries == 0 {
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userConf.Healthcheck.Retries = imageConf.Healthcheck.Retries
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}
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}
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}
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if userConf.WorkingDir == "" {
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userConf.WorkingDir = imageConf.WorkingDir
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}
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if len(userConf.Volumes) == 0 {
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userConf.Volumes = imageConf.Volumes
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} else {
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for k, v := range imageConf.Volumes {
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userConf.Volumes[k] = v
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}
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}
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if userConf.StopSignal == "" {
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userConf.StopSignal = imageConf.StopSignal
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}
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return nil
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}
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// Commit creates a new filesystem image from the current state of a container.
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// The image can optionally be tagged into a repository.
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func (daemon *Daemon) Commit(name string, c *backend.ContainerCommitConfig) (string, error) {
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container, err := daemon.GetContainer(name)
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if err != nil {
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return "", err
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}
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// It is not possible to commit a running container on Windows
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if runtime.GOOS == "windows" && container.IsRunning() {
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return "", fmt.Errorf("Windows does not support commit of a running container")
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}
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if c.Pause && !container.IsPaused() {
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daemon.containerPause(container)
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defer daemon.containerUnpause(container)
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}
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newConfig, err := dockerfile.BuildFromConfig(c.Config, c.Changes)
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if err != nil {
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return "", err
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}
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if c.MergeConfigs {
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if err := merge(newConfig, container.Config); err != nil {
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return "", err
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}
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}
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rwTar, err := daemon.exportContainerRw(container)
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if err != nil {
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return "", err
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}
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defer func() {
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if rwTar != nil {
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rwTar.Close()
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}
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}()
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var history []image.History
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rootFS := image.NewRootFS()
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osVersion := ""
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var osFeatures []string
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if container.ImageID != "" {
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img, err := daemon.imageStore.Get(container.ImageID)
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if err != nil {
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return "", err
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}
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history = img.History
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rootFS = img.RootFS
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osVersion = img.OSVersion
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osFeatures = img.OSFeatures
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}
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l, err := daemon.layerStore.Register(rwTar, rootFS.ChainID())
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if err != nil {
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return "", err
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}
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defer layer.ReleaseAndLog(daemon.layerStore, l)
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h := image.History{
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Author: c.Author,
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Created: time.Now().UTC(),
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CreatedBy: strings.Join(container.Config.Cmd, " "),
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Comment: c.Comment,
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EmptyLayer: true,
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}
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if diffID := l.DiffID(); layer.DigestSHA256EmptyTar != diffID {
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h.EmptyLayer = false
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rootFS.Append(diffID)
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}
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history = append(history, h)
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config, err := json.Marshal(&image.Image{
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V1Image: image.V1Image{
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DockerVersion: dockerversion.Version,
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Config: newConfig,
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Architecture: runtime.GOARCH,
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OS: runtime.GOOS,
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Container: container.ID,
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ContainerConfig: *container.Config,
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Author: c.Author,
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Created: h.Created,
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},
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RootFS: rootFS,
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History: history,
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OSFeatures: osFeatures,
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OSVersion: osVersion,
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})
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if err != nil {
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return "", err
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}
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id, err := daemon.imageStore.Create(config)
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if err != nil {
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return "", err
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}
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if container.ImageID != "" {
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if err := daemon.imageStore.SetParent(id, container.ImageID); err != nil {
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return "", err
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}
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}
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if c.Repo != "" {
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newTag, err := reference.WithName(c.Repo) // todo: should move this to API layer
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if err != nil {
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return "", err
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}
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if c.Tag != "" {
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if newTag, err = reference.WithTag(newTag, c.Tag); err != nil {
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return "", err
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}
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}
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if err := daemon.TagImageWithReference(id, newTag); err != nil {
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return "", err
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}
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}
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attributes := map[string]string{
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"comment": c.Comment,
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}
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daemon.LogContainerEventWithAttributes(container, "commit", attributes)
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return id.String(), nil
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}
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func (daemon *Daemon) exportContainerRw(container *container.Container) (archive.Archive, error) {
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if err := daemon.Mount(container); err != nil {
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return nil, err
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}
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archive, err := container.RWLayer.TarStream()
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if err != nil {
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daemon.Unmount(container) // logging is already handled in the `Unmount` function
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return nil, err
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}
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return ioutils.NewReadCloserWrapper(archive, func() error {
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archive.Close()
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return container.RWLayer.Unmount()
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}),
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nil
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}
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