Golang docker.StreamContainerIO函数代码示例

// Actually invoke the docker API to run the resulting s2i image in a container,
// where the redirecting of the container's stdout and stderr will go to glog.
func (b *DockerRunner) Run(config *api.Config) error {

	glog.V(4).Infof("Attempting to run image %s \n", config.Tag)

	errOutput := ""
	outReader, outWriter := io.Pipe()
	errReader, errWriter := io.Pipe()
	defer errReader.Close()
	defer errWriter.Close()
	defer outReader.Close()
	defer outWriter.Close()

	opts := docker.RunContainerOptions{
		Image:        config.Tag,
		Stdout:       outWriter,
		Stderr:       errWriter,
		TargetImage:  true,
		CGroupLimits: config.CGroupLimits,
	}

	//NOTE, we've seen some Golang level deadlock issues with the streaming of cmd output to
	// glog, but part of the deadlock seems to have occurred when stdout was "silent"
	// and produced no data, such as when we would do a git clone with the --quiet option.
	// We have not seen the hang when the Cmd produces output to stdout.

	go docker.StreamContainerIO(errReader, nil, glog.Error)
	go docker.StreamContainerIO(outReader, nil, glog.Info)
	rerr := b.ContainerClient.RunContainer(opts)
	if e, ok := rerr.(errors.ContainerError); ok {
		return errors.NewContainerError(config.Tag, e.ErrorCode, errOutput)
	}

	return nil
}

// Save extracts and restores the build artifacts from the previous build to a
// current build.
func (builder *STI) Save(config *api.Config) (err error) {
	artifactTmpDir := filepath.Join(config.WorkingDir, "upload", "artifacts")
	if err = builder.fs.Mkdir(artifactTmpDir); err != nil {
		return err
	}

	image := firstNonEmpty(config.IncrementalFromTag, config.Tag)

	outReader, outWriter := io.Pipe()
	defer outReader.Close()
	defer outWriter.Close()
	errReader, errWriter := io.Pipe()
	defer errReader.Close()
	defer errWriter.Close()
	glog.V(1).Infof("Saving build artifacts from image %s to path %s", image, artifactTmpDir)
	extractFunc := func(string) error {
		return builder.tar.ExtractTarStream(artifactTmpDir, outReader)
	}

	user := config.AssembleUser
	if len(user) == 0 {
		user, err = builder.docker.GetImageUser(image)
		if err != nil {
			return err
		}
		glog.V(3).Infof("The assemble user is not set, defaulting to %q user", user)
	} else {
		glog.V(3).Infof("Using assemble user %q to extract artifacts", user)
	}

	opts := dockerpkg.RunContainerOptions{
		Image:           image,
		User:            user,
		ExternalScripts: builder.externalScripts[api.SaveArtifacts],
		ScriptsURL:      config.ScriptsURL,
		Destination:     config.Destination,
		PullImage:       false,
		Command:         api.SaveArtifacts,
		Stdout:          outWriter,
		Stderr:          errWriter,
		OnStart:         extractFunc,
		NetworkMode:     string(config.DockerNetworkMode),
		CGroupLimits:    config.CGroupLimits,
		CapDrop:         config.DropCapabilities,
	}

	go dockerpkg.StreamContainerIO(errReader, nil, func(a ...interface{}) { glog.Info(a...) })
	err = builder.docker.RunContainer(opts)
	if e, ok := err.(errors.ContainerError); ok {
		// even with deferred close above, close errReader now so we avoid data race condition on errOutput;
		// closing will cause StreamContainerIO to exit, thus releasing the writer in the equation
		errReader.Close()
		return errors.NewSaveArtifactsError(image, e.Output, err)
	}
	return err
}

// Save extracts and restores the build artifacts from the previous build to a
// current build.
func (b *STI) Save(config *api.Config) (err error) {
	artifactTmpDir := filepath.Join(config.WorkingDir, "upload", "artifacts")
	if err = b.fs.Mkdir(artifactTmpDir); err != nil {
		return err
	}

	image := config.IncrementalFromTag
	if len(image) == 0 {
		image = config.Tag
	}
	outReader, outWriter := io.Pipe()
	defer outReader.Close()
	defer outWriter.Close()
	errReader, errWriter := io.Pipe()
	defer errReader.Close()
	defer errWriter.Close()
	glog.V(1).Infof("Saving build artifacts from image %s to path %s", image, artifactTmpDir)
	extractFunc := func(string) error {
		return b.tar.ExtractTarStream(artifactTmpDir, outReader)
	}

	user := config.AssembleUser
	if len(user) == 0 {
		user, err = b.docker.GetImageUser(image)
		if err != nil {
			return err
		}
		glog.V(3).Infof("The assemble user is not set, defaulting to %q user", user)
	} else {
		glog.V(3).Infof("Using assemble user %q to extract artifacts", user)
	}

	opts := dockerpkg.RunContainerOptions{
		Image:           image,
		User:            user,
		ExternalScripts: b.externalScripts[api.SaveArtifacts],
		ScriptsURL:      config.ScriptsURL,
		Destination:     config.Destination,
		PullImage:       false,
		Command:         api.SaveArtifacts,
		Stdout:          outWriter,
		Stderr:          errWriter,
		OnStart:         extractFunc,
		NetworkMode:     string(config.DockerNetworkMode),
		CGroupLimits:    config.CGroupLimits,
		CapDrop:         config.DropCapabilities,
	}

	go dockerpkg.StreamContainerIO(errReader, nil, glog.Error)
	err = b.docker.RunContainer(opts)

	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewSaveArtifactsError(image, e.Output, err)
	}
	return err
}

// Run invokes the Docker API to run the image defined in config as a new
// container. The container's stdout and stderr will be logged with glog.
func (b *DockerRunner) Run(config *api.Config) error {
	glog.V(4).Infof("Attempting to run image %s \n", config.Tag)

	outReader, outWriter := io.Pipe()
	defer outReader.Close()
	defer outWriter.Close()
	errReader, errWriter := io.Pipe()
	defer errReader.Close()
	defer errWriter.Close()

	opts := docker.RunContainerOptions{
		Image:        config.Tag,
		Entrypoint:   sti.DefaultEntrypoint,
		Stdout:       outWriter,
		Stderr:       errWriter,
		TargetImage:  true,
		CGroupLimits: config.CGroupLimits,
		CapDrop:      config.DropCapabilities,
	}

	// NOTE, we've seen some Golang level deadlock issues with the streaming of cmd output to
	// glog, but part of the deadlock seems to have occurred when stdout was "silent"
	// and produced no data, such as when we would do a git clone with the --quiet option.
	// We have not seen the hang when the Cmd produces output to stdout.

	go docker.StreamContainerIO(errReader, nil, glog.Error)
	go docker.StreamContainerIO(outReader, nil, glog.Info)

	err := b.ContainerClient.RunContainer(opts)
	// If we get a ContainerError, the original message reports the
	// container name. The container is temporary and its name is
	// meaningless, therefore we make the error message more helpful by
	// replacing the container name with the image tag.
	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewContainerError(config.Tag, e.ErrorCode, e.Output)
	}
	return err
}

// Save extracts and restores the build artifacts from the previous build to a
// current build.
func (b *STI) Save(config *api.Config) (err error) {
	artifactTmpDir := filepath.Join(config.WorkingDir, "upload", "artifacts")
	if err = b.fs.Mkdir(artifactTmpDir); err != nil {
		return err
	}

	image := config.Tag
	outReader, outWriter := io.Pipe()
	errReader, errWriter := io.Pipe()
	defer errReader.Close()
	defer errWriter.Close()
	glog.V(1).Infof("Saving build artifacts from image %s to path %s", image, artifactTmpDir)
	extractFunc := func() error {
		defer outReader.Close()
		return b.tar.ExtractTarStream(artifactTmpDir, outReader)
	}

	opts := dockerpkg.RunContainerOptions{
		Image:           image,
		ExternalScripts: b.externalScripts[api.SaveArtifacts],
		ScriptsURL:      config.ScriptsURL,
		Destination:     config.Destination,
		PullImage:       false,
		Command:         api.SaveArtifacts,
		Stdout:          outWriter,
		Stderr:          errWriter,
		OnStart:         extractFunc,
		NetworkMode:     string(config.DockerNetworkMode),
	}

	go dockerpkg.StreamContainerIO(errReader, nil, glog.Error)
	err = b.docker.RunContainer(opts)

	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewSaveArtifactsError(image, e.Output, err)
	}
	return err
}

// Execute runs the specified STI script in the builder image.
func (b *STI) Execute(command string, config *api.Config) error {
	glog.V(2).Infof("Using image name %s", config.BuilderImage)

	env, err := scripts.GetEnvironment(config)
	if err != nil {
		glog.V(1).Infof("No .sti/environment provided (%v)", err)
	}

	buildEnv := append(scripts.ConvertEnvironment(env), b.generateConfigEnv()...)

	errOutput := ""
	outReader, outWriter := io.Pipe()
	errReader, errWriter := io.Pipe()
	defer outReader.Close()
	defer outWriter.Close()
	defer errReader.Close()
	defer errWriter.Close()
	externalScripts := b.externalScripts[command]
	// if LayeredBuild is called then all the scripts will be placed inside the image
	if config.LayeredBuild {
		externalScripts = false
	}
	opts := dockerpkg.RunContainerOptions{
		Image:           config.BuilderImage,
		Stdout:          outWriter,
		Stderr:          errWriter,
		PullImage:       config.ForcePull,
		ExternalScripts: externalScripts,
		ScriptsURL:      config.ScriptsURL,
		Destination:     config.Destination,
		Command:         command,
		Env:             buildEnv,
		PostExec:        b.postExecutor,
	}

	if !config.LayeredBuild {
		wg := sync.WaitGroup{}
		wg.Add(1)
		uploadDir := filepath.Join(config.WorkingDir, "upload")

		// TODO: be able to pass a stream directly to the Docker build to avoid the double temp hit
		r, w := io.Pipe()
		go func() {
			var err error
			defer func() {
				w.CloseWithError(err)
				if r := recover(); r != nil {
					glog.Errorf("recovered panic: %#v", r)
				}
				wg.Done()
			}()
			err = b.tar.CreateTarStream(uploadDir, false, w)
		}()

		opts.Stdin = r
		defer wg.Wait()
	}

	go func(reader io.Reader) {
		scanner := bufio.NewReader(reader)
		for {
			text, err := scanner.ReadString('\n')
			if err != nil {
				// we're ignoring ErrClosedPipe, as this is information
				// the docker container ended streaming logs
				if glog.V(2) && err != io.ErrClosedPipe {
					glog.Errorf("Error reading docker stdout, %v", err)
				}
				break
			}
			if glog.V(2) || config.Quiet != true || command == api.Usage {
				glog.Info(text)
			}
		}
	}(outReader)

	go dockerpkg.StreamContainerIO(errReader, &errOutput, glog.Error)

	err = b.docker.RunContainer(opts)
	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewContainerError(config.BuilderImage, e.ErrorCode, errOutput)
	}
	return err
}

//.........这里部分代码省略.........
		}
		defer os.Remove(rmScript)
		opts.CommandOverrides = func(cmd string) string {
			return fmt.Sprintf("while [ ! -f %q ]; do sleep 0.5; done; %s; result=$?; source %[1]s; exit $result",
				"/tmp/rm-injections", cmd)
		}
		originalOnStart := opts.OnStart
		opts.OnStart = func(containerID string) error {
			defer close(injectionComplete)
			if err != nil {
				injectionError = err
				return err
			}
			glog.V(2).Info("starting the injections uploading ...")
			for _, s := range config.Injections {
				if err := b.docker.UploadToContainer(s.SourcePath, s.DestinationDir, containerID); err != nil {
					injectionError = util.HandleInjectionError(s, err)
					return err
				}
			}
			if err := b.docker.UploadToContainer(rmScript, "/tmp/rm-injections", containerID); err != nil {
				injectionError = util.HandleInjectionError(api.InjectPath{SourcePath: rmScript, DestinationDir: "/tmp/rm-injections"}, err)
				return err
			}
			if originalOnStart != nil {
				return originalOnStart(containerID)
			}
			return nil
		}
	} else {
		close(injectionComplete)
	}

	wg := sync.WaitGroup{}
	if !config.LayeredBuild {
		wg.Add(1)
		uploadDir := filepath.Join(config.WorkingDir, "upload")
		// TODO: be able to pass a stream directly to the Docker build to avoid the double temp hit
		r, w := io.Pipe()
		go func() {
			// Wait for the injections to complete and check the error. Do not start
			// streaming the sources when the injection failed.
			<-injectionComplete
			if injectionError != nil {
				wg.Done()
				return
			}
			glog.V(2).Info("starting the source uploading ...")
			var err error
			defer func() {
				w.CloseWithError(err)
				if r := recover(); r != nil {
					glog.Errorf("recovered panic: %#v", r)
				}
				wg.Done()
			}()
			err = b.tar.CreateTarStream(uploadDir, false, w)
		}()

		opts.Stdin = r
		defer wg.Wait()
	}

	go func(reader io.Reader) {
		scanner := bufio.NewReader(reader)
		for {
			text, err := scanner.ReadString('\n')
			if err != nil {
				// we're ignoring ErrClosedPipe, as this is information
				// the docker container ended streaming logs
				if glog.V(2) && err != io.ErrClosedPipe {
					glog.Errorf("Error reading docker stdout, %v", err)
				}
				break
			}
			// Nothing is printed when the quiet option is set
			if config.Quiet {
				continue
			}
			// The log level > 3 forces to use glog instead of printing to stdout
			if glog.V(3) {
				glog.Info(text)
				continue
			}
			fmt.Fprintf(os.Stdout, "%s\n", strings.TrimSpace(text))
		}
	}(outReader)

	go dockerpkg.StreamContainerIO(errReader, &errOutput, glog.Error)

	err = b.docker.RunContainer(opts)
	if util.IsTimeoutError(err) {
		// Cancel waiting for source input if the container timeouts
		wg.Done()
	}
	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewContainerError(config.BuilderImage, e.ErrorCode, errOutput)
	}
	return err
}

// Build handles the `docker build` equivalent execution, returning the
// success/failure details.
func (builder *Layered) Build(config *api.Config) (*api.Result, error) {
	buildResult := &api.Result{}

	if config.HasOnBuild && config.BlockOnBuild {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonOnBuildForbidden,
			utilstatus.ReasonMessageOnBuildForbidden,
		)
		return buildResult, errors.New("builder image uses ONBUILD instructions but ONBUILD is not allowed")
	}

	if config.BuilderImage == "" {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonGenericS2IBuildFailed,
			utilstatus.ReasonMessageGenericS2iBuildFailed,
		)
		return buildResult, errors.New("builder image name cannot be empty")
	}

	if err := builder.CreateDockerfile(config); err != nil {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonDockerfileCreateFailed,
			utilstatus.ReasonMessageDockerfileCreateFailed,
		)
		return buildResult, err
	}

	glog.V(2).Info("Creating application source code image")
	tarStream := builder.tar.CreateTarStreamReader(filepath.Join(config.WorkingDir, "upload"), false)
	defer tarStream.Close()

	newBuilderImage := fmt.Sprintf("s2i-layered-temp-image-%d", time.Now().UnixNano())

	outReader, outWriter := io.Pipe()
	opts := docker.BuildImageOptions{
		Name:         newBuilderImage,
		Stdin:        tarStream,
		Stdout:       outWriter,
		CGroupLimits: config.CGroupLimits,
	}
	docker.StreamContainerIO(outReader, nil, func(s string) { glog.V(2).Info(s) })

	glog.V(2).Infof("Building new image %s with scripts and sources already inside", newBuilderImage)
	if err := builder.docker.BuildImage(opts); err != nil {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonDockerImageBuildFailed,
			utilstatus.ReasonMessageDockerImageBuildFailed,
		)
		return buildResult, err
	}

	// upon successful build we need to modify current config
	builder.config.LayeredBuild = true
	// new image name
	builder.config.BuilderImage = newBuilderImage
	// see CreateDockerfile, conditional copy, location of scripts
	scriptsIncluded := checkValidDirWithContents(path.Join(config.WorkingDir, api.UploadScripts))
	glog.V(2).Infof("Scripts dir has contents %v", scriptsIncluded)
	if scriptsIncluded {
		builder.config.ScriptsURL = "image://" + path.Join(getDestination(config), "scripts")
	} else {
		var err error
		builder.config.ScriptsURL, err = builder.docker.GetScriptsURL(newBuilderImage)
		if err != nil {
			buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
				utilstatus.ReasonGenericS2IBuildFailed,
				utilstatus.ReasonMessageGenericS2iBuildFailed,
			)
			return buildResult, err
		}
	}

	glog.V(2).Infof("Building %s using sti-enabled image", builder.config.Tag)
	if err := builder.scripts.Execute(api.Assemble, config.AssembleUser, builder.config); err != nil {
		buildResult.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonAssembleFailed,
			utilstatus.ReasonMessageAssembleFailed,
		)
		switch e := err.(type) {
		case s2ierr.ContainerError:
			return buildResult, s2ierr.NewAssembleError(builder.config.Tag, e.Output, e)
		default:
			return buildResult, err
		}
	}
	buildResult.Success = true

	return buildResult, nil
}

// Execute runs the specified STI script in the builder image.
func (b *STI) Execute(command string, config *api.Config) error {
	glog.V(2).Infof("Using image name %s", config.BuilderImage)

	env, err := scripts.GetEnvironment(config)
	if err != nil {
		glog.V(1).Infof("No .sti/environment provided (%v)", err)
	}

	buildEnv := append(scripts.ConvertEnvironment(env), b.generateConfigEnv()...)

	uploadDir := filepath.Join(config.WorkingDir, "upload")
	tarFileName, err := b.tar.CreateTarFile(config.WorkingDir, uploadDir)
	if err != nil {
		return err
	}

	tarFile, err := b.fs.Open(tarFileName)
	if err != nil {
		return err
	}
	defer tarFile.Close()

	errOutput := ""
	outReader, outWriter := io.Pipe()
	errReader, errWriter := io.Pipe()
	defer outReader.Close()
	defer outWriter.Close()
	defer errReader.Close()
	defer errWriter.Close()
	externalScripts := b.externalScripts[command]
	// if LayeredBuild is called then all the scripts will be placed inside the image
	if config.LayeredBuild {
		externalScripts = false
	}
	opts := dockerpkg.RunContainerOptions{
		Image:           config.BuilderImage,
		Stdout:          outWriter,
		Stderr:          errWriter,
		PullImage:       config.ForcePull,
		ExternalScripts: externalScripts,
		ScriptsURL:      config.ScriptsURL,
		Destination:     config.Destination,
		Command:         command,
		Env:             buildEnv,
		PostExec:        b.postExecutor,
	}
	if !config.LayeredBuild {
		opts.Stdin = tarFile
	}

	go func(reader io.Reader) {
		scanner := bufio.NewReader(reader)
		for {
			text, err := scanner.ReadString('\n')
			if err != nil {
				// we're ignoring ErrClosedPipe, as this is information
				// the docker container ended streaming logs
				if glog.V(2) && err != io.ErrClosedPipe {
					glog.Errorf("Error reading docker stdout, %v", err)
				}
				break
			}
			if glog.V(2) || config.Quiet != true || command == api.Usage {
				glog.Info(text)
			}
		}
	}(outReader)

	go dockerpkg.StreamContainerIO(errReader, &errOutput, glog.Error)

	err = b.docker.RunContainer(opts)
	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewContainerError(config.BuilderImage, e.ErrorCode, errOutput)
	}
	return err
}

//.........这里部分代码省略.........
			return fmt.Sprintf("while [ ! -f %q ]; do sleep 0.5; done; %s; result=$?; source %[1]s; exit $result",
				"/tmp/rm-injections", cmd)
		}
		originalOnStart := opts.OnStart
		opts.OnStart = func(containerID string) error {
			defer close(injectionComplete)
			if err != nil {
				injectionError = err
				return err
			}
			glog.V(2).Info("starting the injections uploading ...")
			for _, s := range config.Injections {
				if err := builder.docker.UploadToContainer(s.Source, s.Destination, containerID); err != nil {
					injectionError = util.HandleInjectionError(s, err)
					return err
				}
			}
			if err := builder.docker.UploadToContainer(rmScript, "/tmp/rm-injections", containerID); err != nil {
				injectionError = util.HandleInjectionError(api.VolumeSpec{Source: rmScript, Destination: "/tmp/rm-injections"}, err)
				return err
			}
			if originalOnStart != nil {
				return originalOnStart(containerID)
			}
			return nil
		}
	} else {
		close(injectionComplete)
	}

	wg := sync.WaitGroup{}
	if !config.LayeredBuild {
		wg.Add(1)
		uploadDir := filepath.Join(config.WorkingDir, "upload")
		// TODO: be able to pass a stream directly to the Docker build to avoid the double temp hit
		r, w := io.Pipe()
		go func() {
			// reminder, multiple defers follow a stack, LIFO order of processing
			defer wg.Done()
			// Wait for the injections to complete and check the error. Do not start
			// streaming the sources when the injection failed.
			<-injectionComplete
			if injectionError != nil {
				return
			}
			glog.V(2).Info("starting the source uploading ...")
			var err error
			defer func() {
				w.CloseWithError(err)
				if r := recover(); r != nil {
					glog.Errorf("recovered panic: %#v", r)
				}
			}()
			err = builder.tar.CreateTarStream(uploadDir, false, w)
		}()

		opts.Stdin = r
	}

	go func(reader io.Reader) {
		scanner := bufio.NewReader(reader)
		// Precede build output with newline
		glog.Info()
		for {
			text, err := scanner.ReadString('\n')
			if err != nil {
				// we're ignoring ErrClosedPipe, as this is information
				// the docker container ended streaming logs
				if glog.Is(2) && err != io.ErrClosedPipe && err != io.EOF {
					glog.Errorf("Error reading docker stdout, %#v", err)
				}
				break
			}
			// Nothing is printed when the quiet option is set
			if config.Quiet {
				continue
			}
			glog.Info(strings.TrimSpace(text))
		}
		// Terminate build output with new line
		glog.Info()

	}(outReader)

	go dockerpkg.StreamContainerIO(errReader, &errOutput, func(a ...interface{}) { glog.Info(a...) })

	err := builder.docker.RunContainer(opts)
	if e, ok := err.(errors.ContainerError); ok {
		// even with deferred close above, close errReader now so we avoid data race condition on errOutput;
		// closing will cause StreamContainerIO to exit, thus releasing the writer in the equation
		errReader.Close()
		return errors.NewContainerError(config.BuilderImage, e.ErrorCode, errOutput)
	}
	// Do not wait for source input if the container times out.
	// FIXME: this potentially leaks a goroutine.
	if !util.IsTimeoutError(err) {
		wg.Wait()
	}
	return err
}

func (step *startRuntimeImageAndUploadFilesStep) execute(ctx *postExecutorStepContext) error {
	glog.V(3).Info("Executing step: start runtime image and upload files")

	fd, err := ioutil.TempFile("", "s2i-upload-done")
	if err != nil {
		return err
	}
	fd.Close()
	lastFilePath := fd.Name()
	defer func() {
		os.Remove(lastFilePath)
	}()

	lastFileDstPath := "/tmp/" + filepath.Base(lastFilePath)

	outReader, outWriter := io.Pipe()
	errReader, errWriter := io.Pipe()

	artifactsDir := filepath.Join(step.builder.config.WorkingDir, api.RuntimeArtifactsDir)

	// We copy scripts to a directory with artifacts to upload files in one shot
	for _, script := range []string{api.AssembleRuntime, api.Run} {
		// scripts must be inside of "scripts" subdir, see createCommandForExecutingRunScript()
		destinationDir := filepath.Join(artifactsDir, "scripts")
		err = step.copyScriptIfNeeded(script, destinationDir)
		if err != nil {
			return err
		}
	}

	image := step.builder.config.RuntimeImage
	workDir, err := step.docker.GetImageWorkdir(image)
	if err != nil {
		return fmt.Errorf("could not get working dir of %q image: %v", image, err)
	}

	commandBaseDir := filepath.Join(workDir, "scripts")
	useExternalAssembleScript := step.builder.externalScripts[api.AssembleRuntime]
	if !useExternalAssembleScript {
		// script already inside of the image
		var scriptsURL string
		scriptsURL, err = step.docker.GetScriptsURL(image)
		if err != nil {
			return err
		}
		if len(scriptsURL) == 0 {
			return fmt.Errorf("could not determine scripts URL for image %q", image)
		}
		commandBaseDir = strings.TrimPrefix(scriptsURL, "image://")
	}

	cmd := fmt.Sprintf(
		"while [ ! -f %q ]; do sleep 0.5; done; %s/%s; exit $?",
		lastFileDstPath,
		commandBaseDir,
		api.AssembleRuntime,
	)

	opts := dockerpkg.RunContainerOptions{
		Image:           image,
		PullImage:       false, // The PullImage is false because we've already pulled the image
		CommandExplicit: []string{"/bin/sh", "-c", cmd},
		Stdout:          outWriter,
		Stderr:          errWriter,
		NetworkMode:     string(step.builder.config.DockerNetworkMode),
		CGroupLimits:    step.builder.config.CGroupLimits,
		CapDrop:         step.builder.config.DropCapabilities,
		PostExec:        step.builder.postExecutor,
		Env:             step.builder.env,
	}

	opts.OnStart = func(containerID string) error {
		setStandardPerms := func(writer io.Writer) s2itar.Writer {
			return s2itar.ChmodAdapter{Writer: tar.NewWriter(writer), NewFileMode: 0644, NewExecFileMode: 0755, NewDirMode: 0755}
		}

		glog.V(5).Infof("Uploading directory %q -> %q", artifactsDir, workDir)
		onStartErr := step.docker.UploadToContainerWithTarWriter(step.fs, artifactsDir, workDir, containerID, setStandardPerms)
		if onStartErr != nil {
			return fmt.Errorf("could not upload directory (%q -> %q) into container %s: %v", artifactsDir, workDir, containerID, err)
		}

		glog.V(5).Infof("Uploading file %q -> %q", lastFilePath, lastFileDstPath)
		onStartErr = step.docker.UploadToContainerWithTarWriter(step.fs, lastFilePath, lastFileDstPath, containerID, setStandardPerms)
		if onStartErr != nil {
			return fmt.Errorf("could not upload file (%q -> %q) into container %s: %v", lastFilePath, lastFileDstPath, containerID, err)
		}

		return onStartErr
	}

	dockerpkg.StreamContainerIO(outReader, nil, func(s string) { glog.V(0).Info(s) })

	errOutput := ""
	c := dockerpkg.StreamContainerIO(errReader, &errOutput, func(s string) { glog.Info(s) })

	// switch to the next stage of post executors steps
	step.builder.postExecutorStage++

	err = step.docker.RunContainer(opts)
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		// scripts must be inside of "scripts" subdir, see createCommandForExecutingRunScript()
		destinationDir := filepath.Join(artifactsDir, "scripts")
		if err := step.copyScriptIfNeeded(script, destinationDir); err != nil {
			return err
		}
	}

	image := step.builder.config.RuntimeImage
	workDir, err := step.docker.GetImageWorkdir(image)
	if err != nil {
		return fmt.Errorf("Couldn't get working dir of %q image: %v", image, err)
	}

	commandBaseDir := filepath.Join(workDir, "scripts")
	useExternalAssembleScript := step.builder.externalScripts[api.AssembleRuntime]
	if !useExternalAssembleScript {
		// script already inside of the image
		scriptsURL, err := step.docker.GetScriptsURL(image)
		if err != nil {
			return err
		}
		if len(scriptsURL) == 0 {
			return fmt.Errorf("Couldn't determine scripts URL for image %q", image)
		}
		commandBaseDir = strings.TrimPrefix(scriptsURL, "image://")
	}

	cmd := fmt.Sprintf(
		"while [ ! -f %q ]; do sleep 0.5; done; %s/%s; exit $?",
		lastFileDstPath,
		commandBaseDir,
		api.AssembleRuntime,
	)

	opts := dockerpkg.RunContainerOptions{
		Image:           image,
		Entrypoint:      DefaultEntrypoint,
		PullImage:       false, // The PullImage is false because we've already pulled the image
		CommandExplicit: []string{"/bin/sh", "-c", cmd},
		Stdout:          outWriter,
		Stderr:          errWriter,
		NetworkMode:     string(step.builder.config.DockerNetworkMode),
		CGroupLimits:    step.builder.config.CGroupLimits,
		CapDrop:         step.builder.config.DropCapabilities,
		PostExec:        step.builder.postExecutor,
		Env:             step.builder.env,
	}

	opts.OnStart = func(containerID string) error {
		setStandardPerms := func(path string, info os.FileInfo, err error) error {
			if err != nil {
				return err
			}
			// chmod does nothing on windows anyway.
			if runtime.GOOS == "windows" {
				return nil
			}
			// Skip chmod for symlinks
			if info.Mode()&os.ModeSymlink != 0 {
				return nil
			}
			// file should be writable by owner (u=w) and readable by other users (a=r),
			// executable bit should be left as is
			mode := os.FileMode(0644)
			// syscall.S_IEXEC == 0x40 but we can't reference the constant if we want
			// to build releases for windows.
			if info.IsDir() || info.Mode()&0x40 != 0 {
				mode = 0755
			}
			return step.fs.Chmod(path, mode)
		}

		glog.V(5).Infof("Uploading directory %q -> %q", artifactsDir, workDir)
		if err := step.docker.UploadToContainerWithCallback(artifactsDir, workDir, containerID, setStandardPerms, true); err != nil {
			return fmt.Errorf("Couldn't upload directory (%q -> %q) into container %s: %v", artifactsDir, workDir, containerID, err)
		}

		glog.V(5).Infof("Uploading file %q -> %q", lastFilePath, lastFileDstPath)
		if err := step.docker.UploadToContainerWithCallback(lastFilePath, lastFileDstPath, containerID, setStandardPerms, true); err != nil {
			return fmt.Errorf("Couldn't upload file (%q -> %q) into container %s: %v", lastFilePath, lastFileDstPath, containerID, err)
		}

		return err
	}

	go dockerpkg.StreamContainerIO(outReader, nil, func(a ...interface{}) { glog.V(0).Info(a...) })

	errOutput := ""
	go dockerpkg.StreamContainerIO(errReader, &errOutput, func(a ...interface{}) { glog.Info(a...) })

	// switch to the next stage of post executors steps
	step.builder.postExecutorStage++

	err = step.docker.RunContainer(opts)
	if e, ok := err.(errors.ContainerError); ok {
		return errors.NewContainerError(image, e.ErrorCode, errOutput)
	}

	return nil
}

//.........这里部分代码省略.........
		User:            user,
		PostExec:        builder.postExecutor,
		NetworkMode:     string(config.DockerNetworkMode),
		CGroupLimits:    config.CGroupLimits,
		CapDrop:         config.DropCapabilities,
		Binds:           config.BuildVolumes.AsBinds(),
	}

	// If there are injections specified, override the original assemble script
	// and wait till all injections are uploaded into the container that runs the
	// assemble script.
	injectionError := make(chan error)
	if len(config.Injections) > 0 && command == api.Assemble {
		workdir, err := builder.docker.GetImageWorkdir(config.BuilderImage)
		if err != nil {
			builder.result.BuildInfo.FailureReason = utilstatus.NewFailureReason(
				utilstatus.ReasonGenericS2IBuildFailed,
				utilstatus.ReasonMessageGenericS2iBuildFailed,
			)
			return err
		}
		config.Injections = util.FixInjectionsWithRelativePath(workdir, config.Injections)
		injectedFiles, err := util.ExpandInjectedFiles(builder.fs, config.Injections)
		if err != nil {
			builder.result.BuildInfo.FailureReason = utilstatus.NewFailureReason(
				utilstatus.ReasonInstallScriptsFailed,
				utilstatus.ReasonMessageInstallScriptsFailed,
			)
			return err
		}
		rmScript, err := util.CreateInjectedFilesRemovalScript(injectedFiles, "/tmp/rm-injections")
		if err != nil {
			builder.result.BuildInfo.FailureReason = utilstatus.NewFailureReason(
				utilstatus.ReasonGenericS2IBuildFailed,
				utilstatus.ReasonMessageGenericS2iBuildFailed,
			)
			return err
		}
		defer os.Remove(rmScript)
		opts.CommandOverrides = func(cmd string) string {
			return fmt.Sprintf("while [ ! -f %q ]; do sleep 0.5; done; %s; result=$?; source %[1]s; exit $result",
				"/tmp/rm-injections", cmd)
		}
		originalOnStart := opts.OnStart
		opts.OnStart = func(containerID string) error {
			defer close(injectionError)
			glog.V(2).Info("starting the injections uploading ...")
			for _, s := range config.Injections {
				if err := builder.docker.UploadToContainer(builder.fs, s.Source, s.Destination, containerID); err != nil {
					injectionError <- util.HandleInjectionError(s, err)
					return err
				}
			}
			if err := builder.docker.UploadToContainer(builder.fs, rmScript, "/tmp/rm-injections", containerID); err != nil {
				injectionError <- util.HandleInjectionError(api.VolumeSpec{Source: rmScript, Destination: "/tmp/rm-injections"}, err)
				return err
			}
			if originalOnStart != nil {
				return originalOnStart(containerID)
			}
			return nil
		}
	} else {
		close(injectionError)
	}

	if !config.LayeredBuild {
		r, w := io.Pipe()
		opts.Stdin = r

		go func() {
			// Wait for the injections to complete and check the error. Do not start
			// streaming the sources when the injection failed.
			if <-injectionError != nil {
				w.Close()
				return
			}
			glog.V(2).Info("starting the source uploading ...")
			uploadDir := filepath.Join(config.WorkingDir, "upload")
			w.CloseWithError(builder.tar.CreateTarStream(uploadDir, false, w))
		}()
	}

	dockerpkg.StreamContainerIO(outReader, nil, func(s string) {
		if !config.Quiet {
			glog.Info(strings.TrimSpace(s))
		}
	})

	c := dockerpkg.StreamContainerIO(errReader, &errOutput, func(s string) { glog.Info(s) })

	err := builder.docker.RunContainer(opts)
	if e, ok := err.(s2ierr.ContainerError); ok {
		// Must wait for StreamContainerIO goroutine above to exit before reading errOutput.
		<-c
		err = s2ierr.NewContainerError(config.BuilderImage, e.ErrorCode, errOutput)
	}

	return err
}

// Save extracts and restores the build artifacts from the previous build to a
// current build.
func (builder *STI) Save(config *api.Config) (err error) {
	artifactTmpDir := filepath.Join(config.WorkingDir, "upload", "artifacts")
	if builder.result == nil {
		builder.result = &api.Result{}
	}

	if err = builder.fs.Mkdir(artifactTmpDir); err != nil {
		builder.result.BuildInfo.FailureReason = utilstatus.NewFailureReason(
			utilstatus.ReasonFSOperationFailed,
			utilstatus.ReasonMessageFSOperationFailed,
		)
		return err
	}

	image := firstNonEmpty(config.IncrementalFromTag, config.Tag)

	outReader, outWriter := io.Pipe()
	errReader, errWriter := io.Pipe()
	glog.V(1).Infof("Saving build artifacts from image %s to path %s", image, artifactTmpDir)
	extractFunc := func(string) error {
		extractErr := builder.tar.ExtractTarStream(artifactTmpDir, outReader)
		io.Copy(ioutil.Discard, outReader) // must ensure reader from container is drained
		return extractErr
	}

	user := config.AssembleUser
	if len(user) == 0 {
		user, err = builder.docker.GetImageUser(image)
		if err != nil {
			builder.result.BuildInfo.FailureReason = utilstatus.NewFailureReason(
				utilstatus.ReasonGenericS2IBuildFailed,
				utilstatus.ReasonMessageGenericS2iBuildFailed,
			)
			return err
		}
		glog.V(3).Infof("The assemble user is not set, defaulting to %q user", user)
	} else {
		glog.V(3).Infof("Using assemble user %q to extract artifacts", user)
	}

	opts := dockerpkg.RunContainerOptions{
		Image:           image,
		User:            user,
		ExternalScripts: builder.externalScripts[api.SaveArtifacts],
		ScriptsURL:      config.ScriptsURL,
		Destination:     config.Destination,
		PullImage:       false,
		Command:         api.SaveArtifacts,
		Stdout:          outWriter,
		Stderr:          errWriter,
		OnStart:         extractFunc,
		NetworkMode:     string(config.DockerNetworkMode),
		CGroupLimits:    config.CGroupLimits,
		CapDrop:         config.DropCapabilities,
	}

	dockerpkg.StreamContainerIO(errReader, nil, func(s string) { glog.Info(s) })
	err = builder.docker.RunContainer(opts)
	if e, ok := err.(s2ierr.ContainerError); ok {
		err = s2ierr.NewSaveArtifactsError(image, e.Output, err)
	}

	builder.result.BuildInfo.FailureReason = utilstatus.NewFailureReason(
		utilstatus.ReasonGenericS2IBuildFailed,
		utilstatus.ReasonMessageGenericS2iBuildFailed,
	)
	return err
}