Golang Image.ID方法代码示例

func (b *Builder) processImageFrom(img *image.Image) error {
	b.image = img.ID().String()

	if img.Config != nil {
		b.runConfig = img.Config
	}

	// The default path will be blank on Windows (set by HCS)
	if len(b.runConfig.Env) == 0 && container.DefaultPathEnv != "" {
		b.runConfig.Env = append(b.runConfig.Env, "PATH="+container.DefaultPathEnv)
	}

	// Process ONBUILD triggers if they exist
	if nTriggers := len(b.runConfig.OnBuild); nTriggers != 0 {
		word := "trigger"
		if nTriggers > 1 {
			word = "triggers"
		}
		fmt.Fprintf(b.Stderr, "# Executing %d build %s...\n", nTriggers, word)
	}

	// Copy the ONBUILD triggers, and remove them from the config, since the config will be committed.
	onBuildTriggers := b.runConfig.OnBuild
	b.runConfig.OnBuild = []string{}

	// parse the ONBUILD triggers by invoking the parser
	for _, step := range onBuildTriggers {
		ast, err := parser.Parse(strings.NewReader(step))
		if err != nil {
			return err
		}

		for i, n := range ast.Children {
			switch strings.ToUpper(n.Value) {
			case "ONBUILD":
				return fmt.Errorf("Chaining ONBUILD via `ONBUILD ONBUILD` isn't allowed")
			case "MAINTAINER", "FROM":
				return fmt.Errorf("%s isn't allowed as an ONBUILD trigger", n.Value)
			}

			if err := b.dispatch(i, n); err != nil {
				return err
			}
		}
	}

	return nil
}

func (ic *imageCache) GetCache(parentID string, cfg *containertypes.Config) (string, error) {
	imgID, err := ic.localImageCache.GetCache(parentID, cfg)
	if err != nil {
		return "", err
	}
	if imgID != "" {
		for _, s := range ic.sources {
			if ic.isParent(s.ID(), image.ID(imgID)) {
				return imgID, nil
			}
		}
	}

	var parent *image.Image
	lenHistory := 0
	if parentID != "" {
		parent, err = ic.daemon.imageStore.Get(image.ID(parentID))
		if err != nil {
			return "", errors.Wrapf(err, "unable to find image %v", parentID)
		}
		lenHistory = len(parent.History)
	}

	for _, target := range ic.sources {
		if !isValidParent(target, parent) || !isValidConfig(cfg, target.History[lenHistory]) {
			continue
		}

		if len(target.History)-1 == lenHistory { // last
			if parent != nil {
				if err := ic.daemon.imageStore.SetParent(target.ID(), parent.ID()); err != nil {
					return "", errors.Wrapf(err, "failed to set parent for %v to %v", target.ID(), parent.ID())
				}
			}
			return target.ID().String(), nil
		}

		imgID, err := ic.restoreCachedImage(parent, target, cfg)
		if err != nil {
			return "", errors.Wrapf(err, "failed to restore cached image from %q to %v", parentID, target.ID())
		}

		ic.sources = []*image.Image{target} // avoid jumping to different target, tuned for safety atm
		return imgID.String(), nil
	}

	return "", nil
}

func newImage(image *image.Image, size int64) *types.Image {
	newImage := new(types.Image)
	newImage.ParentID = image.Parent.String()
	newImage.ID = image.ID().String()
	newImage.Created = image.Created.Unix()
	newImage.Size = size
	newImage.VirtualSize = size
	if image.Config != nil {
		newImage.Labels = image.Config.Labels
	}
	return newImage
}

func newImage(image *image.Image, virtualSize int64) *types.ImageSummary {
	newImage := new(types.ImageSummary)
	newImage.ParentID = image.Parent.String()
	newImage.ID = image.ID().String()
	newImage.Created = image.Created.Unix()
	newImage.Size = -1
	newImage.VirtualSize = virtualSize
	newImage.SharedSize = -1
	newImage.Containers = -1
	if image.Config != nil {
		newImage.Labels = image.Config.Labels
	}
	return newImage
}

func (ic *imageCache) restoreCachedImage(parent, target *image.Image, cfg *containertypes.Config) (image.ID, error) {
	var history []image.History
	rootFS := image.NewRootFS()
	lenHistory := 0
	if parent != nil {
		history = parent.History
		rootFS = parent.RootFS
		lenHistory = len(parent.History)
	}
	history = append(history, target.History[lenHistory])
	if layer := getLayerForHistoryIndex(target, lenHistory); layer != "" {
		rootFS.Append(layer)
	}

	config, err := json.Marshal(&image.Image{
		V1Image: image.V1Image{
			DockerVersion: dockerversion.Version,
			Config:        cfg,
			Architecture:  target.Architecture,
			OS:            target.OS,
			Author:        target.Author,
			Created:       history[len(history)-1].Created,
		},
		RootFS:     rootFS,
		History:    history,
		OSFeatures: target.OSFeatures,
		OSVersion:  target.OSVersion,
	})
	if err != nil {
		return "", errors.Wrap(err, "failed to marshal image config")
	}

	imgID, err := ic.daemon.imageStore.Create(config)
	if err != nil {
		return "", errors.Wrap(err, "failed to create cache image")
	}

	if parent != nil {
		if err := ic.daemon.imageStore.SetParent(imgID, parent.ID()); err != nil {
			return "", errors.Wrapf(err, "failed to set parent for %v to %v", target.ID(), parent.ID())
		}
	}
	return imgID, nil
}

// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(params types.ContainerCreateConfig) (retC *container.Container, retErr error) {
	var (
		container *container.Container
		img       *image.Image
		imgID     image.ID
		err       error
	)

	if params.Config.Image != "" {
		img, err = daemon.GetImage(params.Config.Image)
		if err != nil {
			return nil, err
		}
		imgID = img.ID()
	}

	if err := daemon.mergeAndVerifyConfig(params.Config, img); err != nil {
		return nil, err
	}

	if err := daemon.mergeAndVerifyLogConfig(&params.HostConfig.LogConfig); err != nil {
		return nil, err
	}

	if container, err = daemon.newContainer(params.Name, params.Config, imgID); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.cleanupContainer(container, true); err != nil {
				logrus.Errorf("failed to cleanup container on create error: %v", err)
			}
		}
	}()

	if err := daemon.setSecurityOptions(container, params.HostConfig); err != nil {
		return nil, err
	}

	container.HostConfig.StorageOpt = params.HostConfig.StorageOpt

	// Set RWLayer for container after mount labels have been set
	if err := daemon.setRWLayer(container); err != nil {
		return nil, err
	}

	rootUID, rootGID, err := idtools.GetRootUIDGID(daemon.uidMaps, daemon.gidMaps)
	if err != nil {
		return nil, err
	}
	if err := idtools.MkdirAs(container.Root, 0700, rootUID, rootGID); err != nil {
		return nil, err
	}

	if err := daemon.setHostConfig(container, params.HostConfig); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.removeMountPoints(container, true); err != nil {
				logrus.Error(err)
			}
		}
	}()

	if err := daemon.createContainerPlatformSpecificSettings(container, params.Config, params.HostConfig); err != nil {
		return nil, err
	}

	var endpointsConfigs map[string]*networktypes.EndpointSettings
	if params.NetworkingConfig != nil {
		endpointsConfigs = params.NetworkingConfig.EndpointsConfig
	}

	if err := daemon.updateContainerNetworkSettings(container, endpointsConfigs); err != nil {
		return nil, err
	}

	if err := container.ToDisk(); err != nil {
		logrus.Errorf("Error saving new container to disk: %v", err)
		return nil, err
	}
	if err := daemon.Register(container); err != nil {
		return nil, err
	}
	daemon.LogContainerEvent(container, "create")
	return container, nil
}

// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(params types.ContainerCreateConfig, managed bool) (retC *container.Container, retErr error) {
	var (
		container *container.Container
		img       *image.Image
		imgID     image.ID
		err       error
	)

	if params.Config.Image != "" {
		img, err = daemon.GetImage(params.Config.Image)
		if err != nil {
			return nil, err
		}
		imgID = img.ID()
	}

	if err := daemon.mergeAndVerifyConfig(params.Config, img); err != nil {
		return nil, err
	}

	if err := daemon.mergeAndVerifyLogConfig(&params.HostConfig.LogConfig); err != nil {
		return nil, err
	}

	if container, err = daemon.newContainer(params.Name, params.Config, imgID, managed); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.cleanupContainer(container, true, true); err != nil {
				logrus.Errorf("failed to cleanup container on create error: %v", err)
			}
		}
	}()

	if err := daemon.setSecurityOptions(container, params.HostConfig); err != nil {
		return nil, err
	}

	container.HostConfig.StorageOpt = params.HostConfig.StorageOpt

	// Set RWLayer for container after mount labels have been set
	if err := daemon.setRWLayer(container); err != nil {
		return nil, err
	}

	rootUID, rootGID, err := idtools.GetRootUIDGID(daemon.uidMaps, daemon.gidMaps)
	if err != nil {
		return nil, err
	}
	if err := idtools.MkdirAs(container.Root, 0700, rootUID, rootGID); err != nil {
		return nil, err
	}
	if err := idtools.MkdirAs(container.CheckpointDir(), 0700, rootUID, rootGID); err != nil {
		return nil, err
	}

	if err := daemon.setHostConfig(container, params.HostConfig); err != nil {
		return nil, err
	}

	if err := daemon.createContainerPlatformSpecificSettings(container, params.Config, params.HostConfig); err != nil {
		return nil, err
	}

	var endpointsConfigs map[string]*networktypes.EndpointSettings
	if params.NetworkingConfig != nil {
		endpointsConfigs = params.NetworkingConfig.EndpointsConfig
	}
	// Make sure NetworkMode has an acceptable value. We do this to ensure
	// backwards API compatibility.
	container.HostConfig = runconfig.SetDefaultNetModeIfBlank(container.HostConfig)

	daemon.updateContainerNetworkSettings(container, endpointsConfigs)

	if err := container.ToDisk(); err != nil {
		logrus.Errorf("Error saving new container to disk: %v", err)
		return nil, err
	}
	if err := daemon.Register(container); err != nil {
		return nil, err
	}
	daemon.LogContainerEvent(container, "create")
	return container, nil
}

// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(params *ContainerCreateConfig) (retC *container.Container, retErr error) {
	var (
		container *container.Container
		img       *image.Image
		imgID     image.ID
		err       error
	)

	if params.Config.Image != "" {
		img, err = daemon.GetImage(params.Config.Image)
		if err != nil {
			return nil, err
		}
		imgID = img.ID()
	}

	if err := daemon.mergeAndVerifyConfig(params.Config, img); err != nil {
		return nil, err
	}

	if container, err = daemon.newContainer(params.Name, params.Config, imgID); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.ContainerRm(container.ID, &ContainerRmConfig{ForceRemove: true}); err != nil {
				logrus.Errorf("Clean up Error! Cannot destroy container %s: %v", container.ID, err)
			}
		}
	}()

	if err := daemon.Register(container); err != nil {
		return nil, err
	}
	rootUID, rootGID, err := idtools.GetRootUIDGID(daemon.uidMaps, daemon.gidMaps)
	if err != nil {
		return nil, err
	}
	if err := idtools.MkdirAs(container.Root, 0700, rootUID, rootGID); err != nil {
		return nil, err
	}

	if err := daemon.setHostConfig(container, params.HostConfig); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.removeMountPoints(container, true); err != nil {
				logrus.Error(err)
			}
		}
	}()

	if err := daemon.createContainerPlatformSpecificSettings(container, params.Config, params.HostConfig, img); err != nil {
		return nil, err
	}

	if err := container.ToDiskLocking(); err != nil {
		logrus.Errorf("Error saving new container to disk: %v", err)
		return nil, err
	}
	daemon.LogContainerEvent(container, "create")
	return container, nil
}

// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(params types.ContainerCreateConfig) (retC *container.Container, retErr error) {
	var (
		container *container.Container
		img       *image.Image
		imgID     image.ID
		err       error
	)

	if params.Config.Image != "" {
		img, err = daemon.GetImage(params.Config.Image)
		if err != nil {
			return nil, err
		}
		imgID = img.ID()
	}

	if err := daemon.mergeAndVerifyConfig(params.Config, img); err != nil {
		return nil, err
	}

	if container, err = daemon.newContainer(params.Name, params.Config, imgID); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.ContainerRm(container.ID, &types.ContainerRmConfig{ForceRemove: true}); err != nil {
				logrus.Errorf("Clean up Error! Cannot destroy container %s: %v", container.ID, err)
			}
		}
	}()

	logCfg := container.GetLogConfig(daemon.defaultLogConfig)
	if err := logger.ValidateLogOpts(logCfg.Type, logCfg.Config); err != nil {
		return nil, err
	}

	if err := daemon.setSecurityOptions(container, params.HostConfig); err != nil {
		return nil, err
	}

	// Set RWLayer for container after mount labels have been set
	if err := daemon.setRWLayer(container); err != nil {
		return nil, err
	}

	if err := daemon.Register(container); err != nil {
		return nil, err
	}
	rootUID, rootGID, err := idtools.GetRootUIDGID(daemon.uidMaps, daemon.gidMaps)
	if err != nil {
		return nil, err
	}
	if err := idtools.MkdirAs(container.Root, 0700, rootUID, rootGID); err != nil {
		return nil, err
	}

	if err := daemon.setHostConfig(container, params.HostConfig); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.removeMountPoints(container, true); err != nil {
				logrus.Error(err)
			}
		}
	}()

	if err := daemon.createContainerPlatformSpecificSettings(container, params.Config, params.HostConfig); err != nil {
		return nil, err
	}

	var endpointsConfigs map[string]*networktypes.EndpointSettings
	if params.NetworkingConfig != nil {
		endpointsConfigs = params.NetworkingConfig.EndpointsConfig
	}

	if err := daemon.updateContainerNetworkSettings(container, endpointsConfigs); err != nil {
		return nil, err
	}

	if err := container.ToDiskLocking(); err != nil {
		logrus.Errorf("Error saving new container to disk: %v", err)
		return nil, err
	}
	daemon.LogContainerEvent(container, "create")
	return container, nil
}

func getImageIDAndError(img *image.Image, err error) (string, error) {
	if img == nil || err != nil {
		return "", err
	}
	return img.ID().String(), nil
}

// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(params types.ContainerCreateConfig) (retC *container.Container, retErr error) {
	var (
		container *container.Container
		img       *image.Image
		imgID     image.ID
		err       error
	)

	if params.Config.Image != "" {
		//获取镜像
		img, err = daemon.GetImage(params.Config.Image)
		if err != nil {
			return nil, err
		}
		//获取镜像ID号
		imgID = img.ID()
	}

	//合并并且检查参数
	if err := daemon.mergeAndVerifyConfig(params.Config, img); err != nil {
		return nil, err
	}

	//创建一个新的容器，此时需要跟踪分析newContainer方法，该方法在daemon/daemon.go中。
	//该方法返回的是container，是一个这样的结构：
	/*
		type Container struct {
			//这是通用的参数
			CommonContainer

			// 这个是平台特殊的参数，只在类unix系统上有意义。
			AppArmorProfile string
			HostnamePath    string
			HostsPath       string
			ShmPath         string
			ResolvConfPath  string
			SeccompProfile  string
			NoNewPrivileges bool
		}
	*/
	//创建容器实例，实际上只是在代码中创建，并没有创建文件系统和namespace。
	//实际上，创建容器的过程中最多也就创建到文件系统，namespace只有在容器
	//运行时候才会生效。
	if container, err = daemon.newContainer(params.Name, params.Config, imgID); err != nil {
		return nil, err
	}

	//如果创建容器出错，就试图删除容器。
	defer func() {
		if retErr != nil {
			if err := daemon.ContainerRm(container.ID, &types.ContainerRmConfig{ForceRemove: true}); err != nil {
				logrus.Errorf("Clean up Error! Cannot destroy container %s: %v", container.ID, err)
			}
		}
	}()

	//配置容器的安全设置，例如apparmor,selinux等。
	if err := daemon.setSecurityOptions(container, params.HostConfig); err != nil {
		return nil, err
	}

	// Set RWLayer for container after mount labels have been set
	// 设置可读写层，就是获取layID等信息,包括镜像层、容器层。
	//详情请见setRWLayer函数，就在本文件中。
	if err := daemon.setRWLayer(container); err != nil {
		return nil, err
	}

	//向daemon注册容器：
	//daemon.containers.Add(c.ID, c)
	if err := daemon.Register(container); err != nil {
		return nil, err
	}
	rootUID, rootGID, err := idtools.GetRootUIDGID(daemon.uidMaps, daemon.gidMaps)
	if err != nil {
		return nil, err
	}
	//设置容器root目录（元数据目录/var/lib/docker/containers）的权限。
	if err := idtools.MkdirAs(container.Root, 0700, rootUID, rootGID); err != nil {
		return nil, err
	}

	//这个方法主要做两件事情：
	//挂载volumes;
	//设置容器之间的链接links；
	if err := daemon.setHostConfig(container, params.HostConfig); err != nil {
		return nil, err
	}
	defer func() {
		if retErr != nil {
			if err := daemon.removeMountPoints(container, true); err != nil {
				logrus.Error(err)
			}
		}
	}()

	//这一步是处理和平台相关的操作，具体在daemon/create_unix.go文件中
	/*
			func (daemon *Daemon) createContainerPlatformSpecificSettings(container *container.Container, config *containertypes.Config, hostConfig *containertypes.HostConfig) error {
//.........这里部分代码省略.........