Golang signal.StopCatch函数代码示例

// CmdRun runs a command in a new container.
//
// Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
func (cli *DockerCli) CmdRun(args ...string) error {
	cmd := cli.Subcmd("run", []string{"IMAGE [COMMAND] [ARG...]"}, "Run a command in a new container", true)

	// These are flags not stored in Config/HostConfig
	var (
		flAutoRemove = cmd.Bool([]string{"-rm"}, false, "Automatically remove the container when it exits")
		flDetach     = cmd.Bool([]string{"d", "-detach"}, false, "Run container in background and print container ID")
		flSigProxy   = cmd.Bool([]string{"-sig-proxy"}, true, "Proxy received signals to the process")
		flName       = cmd.String([]string{"-name"}, "", "Assign a name to the container")
		flAttach     *opts.ListOpts

		ErrConflictAttachDetach               = fmt.Errorf("Conflicting options: -a and -d")
		ErrConflictRestartPolicyAndAutoRemove = fmt.Errorf("Conflicting options: --restart and --rm")
		ErrConflictDetachAutoRemove           = fmt.Errorf("Conflicting options: --rm and -d")
	)

	config, hostConfig, cmd, err := runconfig.Parse(cmd, args)
	// just in case the Parse does not exit
	if err != nil {
		cmd.ReportError(err.Error(), true)
		os.Exit(1)
	}

	if len(hostConfig.Dns) > 0 {
		// check the DNS settings passed via --dns against
		// localhost regexp to warn if they are trying to
		// set a DNS to a localhost address
		for _, dnsIP := range hostConfig.Dns {
			if dns.IsLocalhost(dnsIP) {
				fmt.Fprintf(cli.err, "WARNING: Localhost DNS setting (--dns=%s) may fail in containers.\n", dnsIP)
				break
			}
		}
	}
	if config.Image == "" {
		cmd.Usage()
		return nil
	}

	if !*flDetach {
		if err := cli.CheckTtyInput(config.AttachStdin, config.Tty); err != nil {
			return err
		}
	} else {
		if fl := cmd.Lookup("-attach"); fl != nil {
			flAttach = fl.Value.(*opts.ListOpts)
			if flAttach.Len() != 0 {
				return ErrConflictAttachDetach
			}
		}
		if *flAutoRemove {
			return ErrConflictDetachAutoRemove
		}

		config.AttachStdin = false
		config.AttachStdout = false
		config.AttachStderr = false
		config.StdinOnce = false
	}

	// Disable flSigProxy when in TTY mode
	sigProxy := *flSigProxy
	if config.Tty {
		sigProxy = false
	}

	// Telling the Windows daemon the initial size of the tty during start makes
	// a far better user experience rather than relying on subsequent resizes
	// to cause things to catch up.
	if runtime.GOOS == "windows" {
		hostConfig.ConsoleSize[0], hostConfig.ConsoleSize[1] = cli.getTtySize()
	}

	createResponse, err := cli.createContainer(config, hostConfig, hostConfig.ContainerIDFile, *flName)
	if err != nil {
		return err
	}
	if sigProxy {
		sigc := cli.forwardAllSignals(createResponse.ID)
		defer signal.StopCatch(sigc)
	}
	var (
		waitDisplayID chan struct{}
		errCh         chan error
	)
	if !config.AttachStdout && !config.AttachStderr {
		// Make this asynchronous to allow the client to write to stdin before having to read the ID
		waitDisplayID = make(chan struct{})
		go func() {
			defer close(waitDisplayID)
			fmt.Fprintf(cli.out, "%s\n", createResponse.ID)
		}()
	}
	if *flAutoRemove && (hostConfig.RestartPolicy.IsAlways() || hostConfig.RestartPolicy.IsOnFailure()) {
		return ErrConflictRestartPolicyAndAutoRemove
	}
	// We need to instantiate the chan because the select needs it. It can
//.........这里部分代码省略.........

func runStart(dockerCli *command.DockerCli, opts *startOptions) error {
	ctx, cancelFun := context.WithCancel(context.Background())

	if opts.attach || opts.openStdin {
		// We're going to attach to a container.
		// 1. Ensure we only have one container.
		if len(opts.containers) > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		// 2. Attach to the container.
		container := opts.containers[0]
		c, err := dockerCli.Client().ContainerInspect(ctx, container)
		if err != nil {
			return err
		}

		// We always use c.ID instead of container to maintain consistency during `docker start`
		if !c.Config.Tty {
			sigc := ForwardAllSignals(ctx, dockerCli, c.ID)
			defer signal.StopCatch(sigc)
		}

		if opts.detachKeys != "" {
			dockerCli.ConfigFile().DetachKeys = opts.detachKeys
		}

		options := types.ContainerAttachOptions{
			Stream:     true,
			Stdin:      opts.openStdin && c.Config.OpenStdin,
			Stdout:     true,
			Stderr:     true,
			DetachKeys: dockerCli.ConfigFile().DetachKeys,
		}

		var in io.ReadCloser

		if options.Stdin {
			in = dockerCli.In()
		}

		resp, errAttach := dockerCli.Client().ContainerAttach(ctx, c.ID, options)
		if errAttach != nil && errAttach != httputil.ErrPersistEOF {
			// ContainerAttach return an ErrPersistEOF (connection closed)
			// means server met an error and already put it in Hijacked connection,
			// we would keep the error and read the detailed error message from hijacked connection
			return errAttach
		}
		defer resp.Close()
		cErr := promise.Go(func() error {
			errHijack := holdHijackedConnection(ctx, dockerCli, c.Config.Tty, in, dockerCli.Out(), dockerCli.Err(), resp)
			if errHijack == nil {
				return errAttach
			}
			return errHijack
		})

		// 3. We should open a channel for receiving status code of the container
		// no matter it's detached, removed on daemon side(--rm) or exit normally.
		statusChan, statusErr := waitExitOrRemoved(dockerCli, context.Background(), c.ID, c.HostConfig.AutoRemove)
		startOptions := types.ContainerStartOptions{
			CheckpointID: opts.checkpoint,
		}

		// 4. Start the container.
		if err := dockerCli.Client().ContainerStart(ctx, c.ID, startOptions); err != nil {
			cancelFun()
			<-cErr
			if c.HostConfig.AutoRemove && statusErr == nil {
				// wait container to be removed
				<-statusChan
			}
			return err
		}

		// 5. Wait for attachment to break.
		if c.Config.Tty && dockerCli.Out().IsTerminal() {
			if err := MonitorTtySize(ctx, dockerCli, c.ID, false); err != nil {
				fmt.Fprintf(dockerCli.Err(), "Error monitoring TTY size: %s\n", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}

		if statusErr != nil {
			return fmt.Errorf("can't get container's exit code: %v", statusErr)
		}

		if status := <-statusChan; status != 0 {
			return cli.StatusError{StatusCode: status}
		}
	} else if opts.checkpoint != "" {
		if len(opts.containers) > 1 {
			return fmt.Errorf("You cannot restore multiple containers at once.")
		}
		container := opts.containers[0]
		startOptions := types.ContainerStartOptions{
			CheckpointID: opts.checkpoint,
		}
//.........这里部分代码省略.........

func runRun(dockerCli *command.DockerCli, flags *pflag.FlagSet, opts *runOptions, copts *containerOptions) error {
	stdout, stderr, stdin := dockerCli.Out(), dockerCli.Err(), dockerCli.In()
	client := dockerCli.Client()
	// TODO: pass this as an argument
	cmdPath := "run"

	var (
		flAttach                              *opttypes.ListOpts
		ErrConflictAttachDetach               = errors.New("Conflicting options: -a and -d")
		ErrConflictRestartPolicyAndAutoRemove = errors.New("Conflicting options: --restart and --rm")
	)

	config, hostConfig, networkingConfig, err := parse(flags, copts)

	// just in case the parse does not exit
	if err != nil {
		reportError(stderr, cmdPath, err.Error(), true)
		return cli.StatusError{StatusCode: 125}
	}

	if hostConfig.AutoRemove && !hostConfig.RestartPolicy.IsNone() {
		return ErrConflictRestartPolicyAndAutoRemove
	}
	if hostConfig.OomKillDisable != nil && *hostConfig.OomKillDisable && hostConfig.Memory == 0 {
		fmt.Fprintln(stderr, "WARNING: Disabling the OOM killer on containers without setting a '-m/--memory' limit may be dangerous.")
	}

	if len(hostConfig.DNS) > 0 {
		// check the DNS settings passed via --dns against
		// localhost regexp to warn if they are trying to
		// set a DNS to a localhost address
		for _, dnsIP := range hostConfig.DNS {
			if dns.IsLocalhost(dnsIP) {
				fmt.Fprintf(stderr, "WARNING: Localhost DNS setting (--dns=%s) may fail in containers.\n", dnsIP)
				break
			}
		}
	}

	config.ArgsEscaped = false

	if !opts.detach {
		if err := dockerCli.In().CheckTty(config.AttachStdin, config.Tty); err != nil {
			return err
		}
	} else {
		if fl := flags.Lookup("attach"); fl != nil {
			flAttach = fl.Value.(*opttypes.ListOpts)
			if flAttach.Len() != 0 {
				return ErrConflictAttachDetach
			}
		}

		config.AttachStdin = false
		config.AttachStdout = false
		config.AttachStderr = false
		config.StdinOnce = false
	}

	// Disable sigProxy when in TTY mode
	if config.Tty {
		opts.sigProxy = false
	}

	// Telling the Windows daemon the initial size of the tty during start makes
	// a far better user experience rather than relying on subsequent resizes
	// to cause things to catch up.
	if runtime.GOOS == "windows" {
		hostConfig.ConsoleSize[0], hostConfig.ConsoleSize[1] = dockerCli.Out().GetTtySize()
	}

	ctx, cancelFun := context.WithCancel(context.Background())

	createResponse, err := createContainer(ctx, dockerCli, config, hostConfig, networkingConfig, hostConfig.ContainerIDFile, opts.name)
	if err != nil {
		reportError(stderr, cmdPath, err.Error(), true)
		return runStartContainerErr(err)
	}
	if opts.sigProxy {
		sigc := ForwardAllSignals(ctx, dockerCli, createResponse.ID)
		defer signal.StopCatch(sigc)
	}
	var (
		waitDisplayID chan struct{}
		errCh         chan error
	)
	if !config.AttachStdout && !config.AttachStderr {
		// Make this asynchronous to allow the client to write to stdin before having to read the ID
		waitDisplayID = make(chan struct{})
		go func() {
			defer close(waitDisplayID)
			fmt.Fprintln(stdout, createResponse.ID)
		}()
	}
	attach := config.AttachStdin || config.AttachStdout || config.AttachStderr
	if attach {
		var (
			out, cerr io.Writer
			in        io.ReadCloser
		)
//.........这里部分代码省略.........

func runAttach(dockerCli *client.DockerCli, opts *attachOptions) error {
	ctx := context.Background()

	c, err := dockerCli.Client().ContainerInspect(ctx, opts.container)
	if err != nil {
		return err
	}

	if !c.State.Running {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	if c.State.Paused {
		return fmt.Errorf("You cannot attach to a paused container, unpause it first")
	}

	if err := dockerCli.CheckTtyInput(!opts.noStdin, c.Config.Tty); err != nil {
		return err
	}

	if opts.detachKeys != "" {
		dockerCli.ConfigFile().DetachKeys = opts.detachKeys
	}

	options := types.ContainerAttachOptions{
		Stream:     true,
		Stdin:      !opts.noStdin && c.Config.OpenStdin,
		Stdout:     true,
		Stderr:     true,
		DetachKeys: dockerCli.ConfigFile().DetachKeys,
	}

	var in io.ReadCloser
	if options.Stdin {
		in = dockerCli.In()
	}

	if opts.proxy && !c.Config.Tty {
		sigc := dockerCli.ForwardAllSignals(ctx, opts.container)
		defer signal.StopCatch(sigc)
	}

	resp, errAttach := dockerCli.Client().ContainerAttach(ctx, opts.container, options)
	if errAttach != nil && errAttach != httputil.ErrPersistEOF {
		// ContainerAttach returns an ErrPersistEOF (connection closed)
		// means server met an error and put it in Hijacked connection
		// keep the error and read detailed error message from hijacked connection later
		return errAttach
	}
	defer resp.Close()

	if c.Config.Tty && dockerCli.IsTerminalOut() {
		height, width := dockerCli.GetTtySize()
		// To handle the case where a user repeatedly attaches/detaches without resizing their
		// terminal, the only way to get the shell prompt to display for attaches 2+ is to artificially
		// resize it, then go back to normal. Without this, every attach after the first will
		// require the user to manually resize or hit enter.
		dockerCli.ResizeTtyTo(ctx, opts.container, height+1, width+1, false)

		// After the above resizing occurs, the call to MonitorTtySize below will handle resetting back
		// to the actual size.
		if err := dockerCli.MonitorTtySize(ctx, opts.container, false); err != nil {
			logrus.Debugf("Error monitoring TTY size: %s", err)
		}
	}
	if err := dockerCli.HoldHijackedConnection(ctx, c.Config.Tty, in, dockerCli.Out(), dockerCli.Err(), resp); err != nil {
		return err
	}

	if errAttach != nil {
		return errAttach
	}

	_, status, err := getExitCode(dockerCli, ctx, opts.container)
	if err != nil {
		return err
	}
	if status != 0 {
		return cli.StatusError{StatusCode: status}
	}

	return nil
}

// CmdStart starts one or more containers.
//
// Usage: docker start [OPTIONS] CONTAINER [CONTAINER...]
func (cli *DockerCli) CmdStart(args ...string) error {
	cmd := Cli.Subcmd("start", []string{"CONTAINER [CONTAINER...]"}, Cli.DockerCommands["start"].Description, true)
	attach := cmd.Bool([]string{"a", "-attach"}, false, "Attach STDOUT/STDERR and forward signals")
	openStdin := cmd.Bool([]string{"i", "-interactive"}, false, "Attach container's STDIN")
	detachKeys := cmd.String([]string{"-detach-keys"}, "", "Override the key sequence for detaching a container")
	cmd.Require(flag.Min, 1)

	cmd.ParseFlags(args, true)

	ctx, cancelFun := context.WithCancel(context.Background())

	if *attach || *openStdin {
		// We're going to attach to a container.
		// 1. Ensure we only have one container.
		if cmd.NArg() > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		// 2. Attach to the container.
		container := cmd.Arg(0)
		c, err := cli.client.ContainerInspect(ctx, container)
		if err != nil {
			return err
		}

		if !c.Config.Tty {
			sigc := cli.forwardAllSignals(ctx, container)
			defer signal.StopCatch(sigc)
		}

		if *detachKeys != "" {
			cli.configFile.DetachKeys = *detachKeys
		}

		options := types.ContainerAttachOptions{
			Stream:     true,
			Stdin:      *openStdin && c.Config.OpenStdin,
			Stdout:     true,
			Stderr:     true,
			DetachKeys: cli.configFile.DetachKeys,
		}

		var in io.ReadCloser

		if options.Stdin {
			in = cli.in
		}

		resp, errAttach := cli.client.ContainerAttach(ctx, container, options)
		if errAttach != nil && errAttach != httputil.ErrPersistEOF {
			// ContainerAttach return an ErrPersistEOF (connection closed)
			// means server met an error and put it in Hijacked connection
			// keep the error and read detailed error message from hijacked connection
			return errAttach
		}
		defer resp.Close()
		cErr := promise.Go(func() error {
			errHijack := cli.holdHijackedConnection(ctx, c.Config.Tty, in, cli.out, cli.err, resp)
			if errHijack == nil {
				return errAttach
			}
			return errHijack
		})

		// 3. Start the container.
		if err := cli.client.ContainerStart(ctx, container); err != nil {
			cancelFun()
			<-cErr
			return err
		}

		// 4. Wait for attachment to break.
		if c.Config.Tty && cli.isTerminalOut {
			if err := cli.monitorTtySize(ctx, container, false); err != nil {
				fmt.Fprintf(cli.err, "Error monitoring TTY size: %s\n", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}
		_, status, err := cli.getExitCode(ctx, container)
		if err != nil {
			return err
		}
		if status != 0 {
			return Cli.StatusError{StatusCode: status}
		}
	} else {
		// We're not going to attach to anything.
		// Start as many containers as we want.
		return cli.startContainersWithoutAttachments(ctx, cmd.Args())
	}

	return nil
}

// CmdAttach attaches to a running container.
//
// Usage: docker attach [OPTIONS] CONTAINER
func (cli *DockerCli) CmdAttach(args ...string) error {
	var (
		cmd     = cli.Subcmd("attach", "CONTAINER", "Attach to a running container", true)
		noStdin = cmd.Bool([]string{"#nostdin", "-no-stdin"}, false, "Do not attach STDIN")
		proxy   = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy all received signals to the process")
	)
	cmd.Require(flag.Exact, 1)

	cmd.ParseFlags(args, true)
	name := cmd.Arg(0)

	stream, _, _, err := cli.call("GET", "/containers/"+name+"/json", nil, nil)
	if err != nil {
		return err
	}

	var c types.ContainerJSON
	if err := json.NewDecoder(stream).Decode(&c); err != nil {
		return err
	}

	if !c.State.Running {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	if err := cli.CheckTtyInput(!*noStdin, c.Config.Tty); err != nil {
		return err
	}

	if c.Config.Tty && cli.isTerminalOut {
		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
			logrus.Debugf("Error monitoring TTY size: %s", err)
		}
	}

	var in io.ReadCloser

	v := url.Values{}
	v.Set("stream", "1")
	if !*noStdin && c.Config.OpenStdin {
		v.Set("stdin", "1")
		in = cli.in
	}

	v.Set("stdout", "1")
	v.Set("stderr", "1")

	if *proxy && !c.Config.Tty {
		sigc := cli.forwardAllSignals(cmd.Arg(0))
		defer signal.StopCatch(sigc)
	}

	if err := cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), c.Config.Tty, in, cli.out, cli.err, nil, nil); err != nil {
		return err
	}

	_, status, err := getExitCode(cli, cmd.Arg(0))
	if err != nil {
		return err
	}
	if status != 0 {
		return StatusError{StatusCode: status}
	}

	return nil
}

// CmdRun runs a command in a new container.
//
// Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
func (cli *DockerCli) CmdRun(args ...string) error {
	cmd := Cli.Subcmd("run", []string{"IMAGE [COMMAND] [ARG...]"}, Cli.DockerCommands["run"].Description, true)
	addTrustedFlags(cmd, true)

	// These are flags not stored in Config/HostConfig
	var (
		flAutoRemove = cmd.Bool([]string{"-rm"}, false, "Automatically remove the container when it exits")
		flDetach     = cmd.Bool([]string{"d", "-detach"}, false, "Run container in background and print container ID")
		flSigProxy   = cmd.Bool([]string{"-sig-proxy"}, true, "Proxy received signals to the process")
		flName       = cmd.String([]string{"-name"}, "", "Assign a name to the container")
		flDetachKeys = cmd.String([]string{"-detach-keys"}, "", "Override the key sequence for detaching a container")
		flAttach     *opts.ListOpts

		ErrConflictAttachDetach               = fmt.Errorf("Conflicting options: -a and -d")
		ErrConflictRestartPolicyAndAutoRemove = fmt.Errorf("Conflicting options: --restart and --rm")
		ErrConflictDetachAutoRemove           = fmt.Errorf("Conflicting options: --rm and -d")
	)

	config, hostConfig, cmd, err := runconfig.Parse(cmd, args)
	// just in case the Parse does not exit
	if err != nil {
		cmd.ReportError(err.Error(), true)
		os.Exit(125)
	}

	if hostConfig.OomKillDisable && hostConfig.Memory == 0 {
		fmt.Fprintf(cli.err, "WARNING: Dangerous only disable the OOM Killer on containers but not set the '-m/--memory' option\n")
	}

	if len(hostConfig.DNS) > 0 {
		// check the DNS settings passed via --dns against
		// localhost regexp to warn if they are trying to
		// set a DNS to a localhost address
		for _, dnsIP := range hostConfig.DNS {
			if dns.IsLocalhost(dnsIP) {
				fmt.Fprintf(cli.err, "WARNING: Localhost DNS setting (--dns=%s) may fail in containers.\n", dnsIP)
				break
			}
		}
	}
	if config.Image == "" {
		cmd.Usage()
		return nil
	}

	config.ArgsEscaped = false

	if !*flDetach {
		if err := cli.CheckTtyInput(config.AttachStdin, config.Tty); err != nil {
			return err
		}
	} else {
		if fl := cmd.Lookup("-attach"); fl != nil {
			flAttach = fl.Value.(*opts.ListOpts)
			if flAttach.Len() != 0 {
				return ErrConflictAttachDetach
			}
		}
		if *flAutoRemove {
			return ErrConflictDetachAutoRemove
		}

		config.AttachStdin = false
		config.AttachStdout = false
		config.AttachStderr = false
		config.StdinOnce = false
	}

	// Disable flSigProxy when in TTY mode
	sigProxy := *flSigProxy
	if config.Tty {
		sigProxy = false
	}

	// Telling the Windows daemon the initial size of the tty during start makes
	// a far better user experience rather than relying on subsequent resizes
	// to cause things to catch up.
	if runtime.GOOS == "windows" {
		hostConfig.ConsoleSize[0], hostConfig.ConsoleSize[1] = cli.getTtySize()
	}

	createResponse, err := cli.createContainer(config, hostConfig, hostConfig.ContainerIDFile, *flName)
	if err != nil {
		cmd.ReportError(err.Error(), true)
		return runStartContainerErr(err)
	}
	if sigProxy {
		sigc := cli.forwardAllSignals(createResponse.ID)
		defer signal.StopCatch(sigc)
	}
	var (
		waitDisplayID chan struct{}
		errCh         chan error
	)
	if !config.AttachStdout && !config.AttachStderr {
		// Make this asynchronous to allow the client to write to stdin before having to read the ID
		waitDisplayID = make(chan struct{})
//.........这里部分代码省略.........

func runStart(dockerCli *client.DockerCli, opts *startOptions) error {
	ctx, cancelFun := context.WithCancel(context.Background())

	if opts.attach || opts.openStdin {
		// We're going to attach to a container.
		// 1. Ensure we only have one container.
		if len(opts.containers) > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		// 2. Attach to the container.
		container := opts.containers[0]
		c, err := dockerCli.Client().ContainerInspect(ctx, container)
		if err != nil {
			return err
		}

		// We always use c.ID instead of container to maintain consistency during `docker start`
		if !c.Config.Tty {
			sigc := dockerCli.ForwardAllSignals(ctx, c.ID)
			defer signal.StopCatch(sigc)
		}

		if opts.detachKeys != "" {
			dockerCli.ConfigFile().DetachKeys = opts.detachKeys
		}

		options := types.ContainerAttachOptions{
			Stream:     true,
			Stdin:      opts.openStdin && c.Config.OpenStdin,
			Stdout:     true,
			Stderr:     true,
			DetachKeys: dockerCli.ConfigFile().DetachKeys,
		}

		var in io.ReadCloser

		if options.Stdin {
			in = dockerCli.In()
		}

		resp, errAttach := dockerCli.Client().ContainerAttach(ctx, c.ID, options)
		if errAttach != nil && errAttach != httputil.ErrPersistEOF {
			// ContainerAttach return an ErrPersistEOF (connection closed)
			// means server met an error and put it in Hijacked connection
			// keep the error and read detailed error message from hijacked connection
			return errAttach
		}
		defer resp.Close()
		cErr := promise.Go(func() error {
			errHijack := dockerCli.HoldHijackedConnection(ctx, c.Config.Tty, in, dockerCli.Out(), dockerCli.Err(), resp)
			if errHijack == nil {
				return errAttach
			}
			return errHijack
		})

		// 3. Start the container.
		if err := dockerCli.Client().ContainerStart(ctx, c.ID, types.ContainerStartOptions{}); err != nil {
			cancelFun()
			<-cErr
			return err
		}

		// 4. Wait for attachment to break.
		if c.Config.Tty && dockerCli.IsTerminalOut() {
			if err := dockerCli.MonitorTtySize(ctx, c.ID, false); err != nil {
				fmt.Fprintf(dockerCli.Err(), "Error monitoring TTY size: %s\n", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}
		_, status, err := getExitCode(dockerCli, ctx, c.ID)
		if err != nil {
			return err
		}
		if status != 0 {
			return cli.StatusError{StatusCode: status}
		}
	} else {
		// We're not going to attach to anything.
		// Start as many containers as we want.
		return startContainersWithoutAttachments(dockerCli, ctx, opts.containers)
	}

	return nil
}

// CmdAttach attaches to a running container.
//
// Usage: docker attach [OPTIONS] CONTAINER
func (cli *DockerCli) CmdAttach(args ...string) error {
	cmd := Cli.Subcmd("attach", []string{"CONTAINER"}, Cli.DockerCommands["attach"].Description, true)
	noStdin := cmd.Bool([]string{"-no-stdin"}, false, "Do not attach STDIN")
	proxy := cmd.Bool([]string{"-sig-proxy"}, true, "Proxy all received signals to the process")
	detachKeys := cmd.String([]string{"-detach-keys"}, "", "Override the key sequence for detaching a container")

	cmd.Require(flag.Exact, 1)

	cmd.ParseFlags(args, true)

	c, err := cli.client.ContainerInspect(context.Background(), cmd.Arg(0))
	if err != nil {
		return err
	}

	if !c.State.Running {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	if c.State.Paused {
		return fmt.Errorf("You cannot attach to a paused container, unpause it first")
	}

	if err := cli.CheckTtyInput(!*noStdin, c.Config.Tty); err != nil {
		return err
	}

	if *detachKeys != "" {
		cli.configFile.DetachKeys = *detachKeys
	}

	container := cmd.Arg(0)

	options := types.ContainerAttachOptions{
		Stream:     true,
		Stdin:      !*noStdin && c.Config.OpenStdin,
		Stdout:     true,
		Stderr:     true,
		DetachKeys: cli.configFile.DetachKeys,
	}

	var in io.ReadCloser
	if options.Stdin {
		in = cli.in
	}

	if *proxy && !c.Config.Tty {
		sigc := cli.forwardAllSignals(container)
		defer signal.StopCatch(sigc)
	}

	resp, errAttach := cli.client.ContainerAttach(context.Background(), container, options)
	if errAttach != nil && errAttach != httputil.ErrPersistEOF {
		// ContainerAttach returns an ErrPersistEOF (connection closed)
		// means server met an error and put it in Hijacked connection
		// keep the error and read detailed error message from hijacked connection later
		return errAttach
	}
	defer resp.Close()

	if c.Config.Tty && cli.isTerminalOut {
		height, width := cli.getTtySize()
		// To handle the case where a user repeatedly attaches/detaches without resizing their
		// terminal, the only way to get the shell prompt to display for attaches 2+ is to artificially
		// resize it, then go back to normal. Without this, every attach after the first will
		// require the user to manually resize or hit enter.
		cli.resizeTtyTo(cmd.Arg(0), height+1, width+1, false)

		// After the above resizing occurs, the call to monitorTtySize below will handle resetting back
		// to the actual size.
		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
			logrus.Debugf("Error monitoring TTY size: %s", err)
		}
	}
	if err := cli.holdHijackedConnection(context.Background(), c.Config.Tty, in, cli.out, cli.err, resp); err != nil {
		return err
	}

	if errAttach != nil {
		return errAttach
	}

	_, status, err := getExitCode(cli, container)
	if err != nil {
		return err
	}
	if status != 0 {
		return Cli.StatusError{StatusCode: status}
	}

	return nil
}

// CmdStart starts one or more stopped containers.
//
// Usage: docker start [OPTIONS] CONTAINER [CONTAINER...]
func (cli *DockerCli) CmdStart(args ...string) error {
	var (
		cErr chan error
		tty  bool

		cmd       = cli.Subcmd("start", "CONTAINER [CONTAINER...]", "Start one or more stopped containers", true)
		attach    = cmd.Bool([]string{"a", "-attach"}, false, "Attach STDOUT/STDERR and forward signals")
		openStdin = cmd.Bool([]string{"i", "-interactive"}, false, "Attach container's STDIN")
	)

	cmd.Require(flag.Min, 1)
	cmd.ParseFlags(args, true)

	if *attach || *openStdin {
		if cmd.NArg() > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, nil)
		if err != nil {
			return err
		}

		var c types.ContainerJSON
		if err := json.NewDecoder(stream).Decode(&c); err != nil {
			return err
		}

		tty = c.Config.Tty

		if !tty {
			sigc := cli.forwardAllSignals(cmd.Arg(0))
			defer signal.StopCatch(sigc)
		}

		var in io.ReadCloser

		v := url.Values{}
		v.Set("stream", "1")

		if *openStdin && c.Config.OpenStdin {
			v.Set("stdin", "1")
			in = cli.in
		}

		v.Set("stdout", "1")
		v.Set("stderr", "1")

		hijacked := make(chan io.Closer)
		// Block the return until the chan gets closed
		defer func() {
			logrus.Debugf("CmdStart() returned, defer waiting for hijack to finish.")
			if _, ok := <-hijacked; ok {
				fmt.Fprintln(cli.err, "Hijack did not finish (chan still open)")
			}
			cli.in.Close()
		}()
		cErr = promise.Go(func() error {
			return cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, hijacked, nil)
		})

		// Acknowledge the hijack before starting
		select {
		case closer := <-hijacked:
			// Make sure that the hijack gets closed when returning (results
			// in closing the hijack chan and freeing server's goroutines)
			if closer != nil {
				defer closer.Close()
			}
		case err := <-cErr:
			if err != nil {
				return err
			}
		}
	}

	var encounteredError error
	var errNames []string
	for _, name := range cmd.Args() {
		_, _, err := readBody(cli.call("POST", "/containers/"+name+"/start", nil, nil))
		if err != nil {
			if !*attach && !*openStdin {
				// attach and openStdin is false means it could be starting multiple containers
				// when a container start failed, show the error message and start next
				fmt.Fprintf(cli.err, "%s\n", err)
				errNames = append(errNames, name)
			} else {
				encounteredError = err
			}
		} else {
			if !*attach && !*openStdin {
				fmt.Fprintf(cli.out, "%s\n", name)
			}
		}
	}

	if len(errNames) > 0 {
//.........这里部分代码省略.........

// CmdAttach attaches to a running container.
//
// Usage: docker attach [OPTIONS] CONTAINER
func (cli *DockerCli) CmdAttach(args ...string) error {
	cmd := Cli.Subcmd("attach", []string{"CONTAINER"}, Cli.DockerCommands["attach"].Description, true)
	noStdin := cmd.Bool([]string{"-no-stdin"}, false, "Do not attach STDIN")
	proxy := cmd.Bool([]string{"-sig-proxy"}, true, "Proxy all received signals to the process")

	cmd.Require(flag.Exact, 1)

	cmd.ParseFlags(args, true)

	c, err := cli.client.ContainerInspect(cmd.Arg(0))
	if err != nil {
		return err
	}

	if !c.State.Running {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	if c.State.Paused {
		return fmt.Errorf("You cannot attach to a paused container, unpause it first")
	}

	if err := cli.CheckTtyInput(!*noStdin, c.Config.Tty); err != nil {
		return err
	}

	if c.Config.Tty && cli.isTerminalOut {
		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
			logrus.Debugf("Error monitoring TTY size: %s", err)
		}
	}

	options := types.ContainerAttachOptions{
		ContainerID: cmd.Arg(0),
		Stream:      true,
		Stdin:       !*noStdin && c.Config.OpenStdin,
		Stdout:      true,
		Stderr:      true,
	}

	var in io.ReadCloser
	if options.Stdin {
		in = cli.in
	}

	if *proxy && !c.Config.Tty {
		sigc := cli.forwardAllSignals(options.ContainerID)
		defer signal.StopCatch(sigc)
	}

	resp, err := cli.client.ContainerAttach(options)
	if err != nil {
		return err
	}
	defer resp.Close()

	if err := cli.holdHijackedConnection(c.Config.Tty, in, cli.out, cli.err, resp); err != nil {
		return err
	}

	_, status, err := getExitCode(cli, options.ContainerID)
	if err != nil {
		return err
	}
	if status != 0 {
		return Cli.StatusError{StatusCode: status}
	}

	return nil
}

// CmdStart starts one or more containers.
//
// Usage: docker start [OPTIONS] CONTAINER [CONTAINER...]
func (cli *DockerCli) CmdStart(args ...string) error {
	cmd := Cli.Subcmd("start", []string{"CONTAINER [CONTAINER...]"}, Cli.DockerCommands["start"].Description, true)
	attach := cmd.Bool([]string{"a", "-attach"}, false, "Attach STDOUT/STDERR and forward signals")
	openStdin := cmd.Bool([]string{"i", "-interactive"}, false, "Attach container's STDIN")
	cmd.Require(flag.Min, 1)

	cmd.ParseFlags(args, true)

	if *attach || *openStdin {
		// We're going to attach to a container.
		// 1. Ensure we only have one container.
		if cmd.NArg() > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		// 2. Attach to the container.
		containerID := cmd.Arg(0)
		c, err := cli.client.ContainerInspect(containerID)
		if err != nil {
			return err
		}

		if !c.Config.Tty {
			sigc := cli.forwardAllSignals(containerID)
			defer signal.StopCatch(sigc)
		}

		options := types.ContainerAttachOptions{
			ContainerID: containerID,
			Stream:      true,
			Stdin:       *openStdin && c.Config.OpenStdin,
			Stdout:      true,
			Stderr:      true,
		}

		var in io.ReadCloser
		if options.Stdin {
			in = cli.in
		}

		resp, err := cli.client.ContainerAttach(options)
		if err != nil {
			return err
		}
		defer resp.Close()

		cErr := promise.Go(func() error {
			return cli.holdHijackedConnection(c.Config.Tty, in, cli.out, cli.err, resp)
		})

		// 3. Start the container.
		if err := cli.client.ContainerStart(containerID); err != nil {
			return err
		}

		// 4. Wait for attachment to break.
		if c.Config.Tty && cli.isTerminalOut {
			if err := cli.monitorTtySize(containerID, false); err != nil {
				fmt.Fprintf(cli.err, "Error monitoring TTY size: %s\n", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}
		_, status, err := getExitCode(cli, containerID)
		if err != nil {
			return err
		}
		if status != 0 {
			return Cli.StatusError{StatusCode: status}
		}
	} else {
		// We're not going to attach to anything.
		// Start as many containers as we want.
		return cli.startContainersWithoutAttachments(cmd.Args())
	}

	return nil
}

func (cli *KraneCli) CmdRun(args ...string) error {
	// FIXME: just use runconfig.Parse already
	cmd := cli.Subcmd("run", "IMAGE [COMMAND] [ARG...]", "Run a command in a new container")

	// These are flags not stored in Config/HostConfig
	var (
		flAutoRemove = cmd.Bool([]string{"#rm", "-rm"}, false, "Automatically remove the container when it exits (incompatible with -d)")
		flDetach     = cmd.Bool([]string{"d", "-detach"}, false, "Detached mode: run the container in the background and print the new container ID")
		flSigProxy   = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy received signals to the process (even in non-TTY mode). SIGCHLD, SIGSTOP, and SIGKILL are not proxied.")
		flName       = cmd.String([]string{"#name", "-name"}, "", "Assign a name to the container")
		flShip       = cmd.String([]string{"ship", "-ship"}, "", "Ship name to deploy at")
		flAttach     *opts.ListOpts

		ErrConflictAttachDetach               = fmt.Errorf("Conflicting options: -a and -d")
		ErrConflictRestartPolicyAndAutoRemove = fmt.Errorf("Conflicting options: --restart and --rm")
		ErrConflictDetachAutoRemove           = fmt.Errorf("Conflicting options: --rm and -d")
	)

	config, hostConfig, cmd, err := runconfig.Parse(cmd, args, nil)
	if err != nil {
		return err
	}
	if config.Image == "" || *flShip == "" {
		cmd.Usage()
		return nil
	}

	if *flDetach {
		if fl := cmd.Lookup("attach"); fl != nil {
			flAttach = fl.Value.(*opts.ListOpts)
			if flAttach.Len() != 0 {
				return ErrConflictAttachDetach
			}
		}
		if *flAutoRemove {
			return ErrConflictDetachAutoRemove
		}

		config.AttachStdin = false
		config.AttachStdout = false
		config.AttachStderr = false
		config.StdinOnce = false
	}

	// Disable flSigProxy when in TTY mode
	sigProxy := *flSigProxy
	if config.Tty {
		sigProxy = false
	}

	runResult, err := cli.createContainer(config, hostConfig, hostConfig.ContainerIDFile, *flName, *flShip)
	if err != nil {
		return err
	}

	if sigProxy {
		sigc := cli.forwardAllSignals(runResult.Get("Id"))
		defer signal.StopCatch(sigc)
	}

	var (
		waitDisplayId chan struct{}
		errCh         chan error
	)

	if !config.AttachStdout && !config.AttachStderr {
		// Make this asynchronous to allow the client to write to stdin before having to read the ID
		waitDisplayId = make(chan struct{})
		go func() {
			defer close(waitDisplayId)
			fmt.Fprintf(cli.out, "%s\n", runResult.Get("Id"))
		}()
	}

	if *flAutoRemove && (hostConfig.RestartPolicy.Name == "always" || hostConfig.RestartPolicy.Name == "on-failure") {
		return ErrConflictRestartPolicyAndAutoRemove
	}

	// We need to instantiate the chan because the select needs it. It can
	// be closed but can't be uninitialized.
	hijacked := make(chan io.Closer)

	// Block the return until the chan gets closed
	defer func() {
		log.Debugf("End of CmdRun(), Waiting for hijack to finish.")
		if _, ok := <-hijacked; ok {
			log.Errorf("Hijack did not finish (chan still open)")
		}
	}()

	if config.AttachStdin || config.AttachStdout || config.AttachStderr {
		var (
			out, stderr io.Writer
			in          io.ReadCloser
			v           = url.Values{}
		)
		v.Set("stream", "1")

		if config.AttachStdin {
			v.Set("stdin", "1")
//.........这里部分代码省略.........