Golang container.StartPty函數代碼示例

// GetContainerLogs returns logs of a specific container. By
// default, it returns a snapshot of the container log. Set 'follow' to true to
// stream the log. Set 'follow' to false and specify the number of lines (e.g.
// "100" or "all") to tail the log.
func (r *runtime) GetContainerLogs(pod *api.Pod, containerID kubecontainer.ContainerID, logOptions *api.PodLogOptions, stdout, stderr io.Writer) error {
	glog.V(4).Infof("Hyper: running logs on container %s", containerID.ID)

	args := append([]string{}, "logs")
	if logOptions.Follow {
		args = append(args, "--follow")
	}
	if logOptions.SinceSeconds != nil && *logOptions.SinceSeconds != 0 {
		args = append(args, fmt.Sprintf("--since=%d", *logOptions.SinceSeconds))
	}
	if logOptions.TailLines != nil && *logOptions.TailLines != 0 {
		args = append(args, fmt.Sprintf("--tail=%d", *logOptions.TailLines))
	}
	if logOptions.Timestamps {
		args = append(args, "--timestamps")
	}
	args = append(args, containerID.ID)

	command := r.buildCommand(args...)
	p, err := kubecontainer.StartPty(command)
	if err != nil {
		return err
	}
	defer p.Close()

	if stdout != nil {
		go io.Copy(stdout, p)
	}
	return command.Wait()
}

// Runs the command in the container of the specified pod.
// Attaches the processes stdin, stdout, and stderr. Optionally uses a
// tty.
func (r *runtime) ExecInContainer(containerID kubecontainer.ContainerID, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error {
	glog.V(4).Infof("Hyper: execing %s in container %s.", cmd, containerID.ID)

	args := append([]string{}, "exec", "-a", containerID.ID)
	args = append(args, cmd...)
	command := r.buildCommand(args...)

	p, err := kubecontainer.StartPty(command)
	if err != nil {
		return err
	}
	defer p.Close()

	// make sure to close the stdout stream
	defer stdout.Close()

	if stdin != nil {
		go io.Copy(p, stdin)
	}

	if stdout != nil {
		go io.Copy(stdout, p)
	}
	return command.Wait()
}

// TODO should we support nsenter in a container, running with elevated privs and --pid=host?
func (*NsenterExecHandler) ExecInContainer(client DockerInterface, container *dockertypes.ContainerJSON, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error {
	nsenter, err := exec.LookPath("nsenter")
	if err != nil {
		return fmt.Errorf("exec unavailable - unable to locate nsenter")
	}

	containerPid := container.State.Pid

	// TODO what if the container doesn't have `env`???
	args := []string{"-t", fmt.Sprintf("%d", containerPid), "-m", "-i", "-u", "-n", "-p", "--", "env", "-i"}
	args = append(args, fmt.Sprintf("HOSTNAME=%s", container.Config.Hostname))
	args = append(args, container.Config.Env...)
	args = append(args, cmd...)
	command := exec.Command(nsenter, args...)
	if tty {
		p, err := kubecontainer.StartPty(command)
		if err != nil {
			return err
		}
		defer p.Close()

		// make sure to close the stdout stream
		defer stdout.Close()

		if stdin != nil {
			go io.Copy(p, stdin)
		}

		if stdout != nil {
			go io.Copy(stdout, p)
		}

		return command.Wait()
	} else {
		if stdin != nil {
			// Use an os.Pipe here as it returns true *os.File objects.
			// This way, if you run 'kubectl exec <pod> -i bash' (no tty) and type 'exit',
			// the call below to command.Run() can unblock because its Stdin is the read half
			// of the pipe.
			r, w, err := os.Pipe()
			if err != nil {
				return err
			}
			go io.Copy(w, stdin)

			command.Stdin = r
		}
		if stdout != nil {
			command.Stdout = stdout
		}
		if stderr != nil {
			command.Stderr = stderr
		}

		return command.Run()
	}
}

// Note: In rkt, the container ID is in the form of "UUID:appName:ImageID", where
// appName is the container name.
func (r *runtime) ExecInContainer(containerID string, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error {
	glog.V(4).Infof("Rkt execing in container.")

	id, err := parseContainerID(containerID)
	if err != nil {
		return err
	}
	// TODO(yifan): Use appName instead of imageID.
	// see https://github.com/coreos/rkt/pull/640
	args := append([]string{}, "enter", "--imageid", id.imageID, id.uuid)
	args = append(args, cmd...)
	command := r.buildCommand(args...)

	if tty {
		p, err := kubecontainer.StartPty(command)
		if err != nil {
			return err
		}
		defer p.Close()

		// make sure to close the stdout stream
		defer stdout.Close()

		if stdin != nil {
			go io.Copy(p, stdin)
		}
		if stdout != nil {
			go io.Copy(stdout, p)
		}
		return command.Wait()
	}
	if stdin != nil {
		// Use an os.Pipe here as it returns true *os.File objects.
		// This way, if you run 'kubectl exec <pod> -i bash' (no tty) and type 'exit',
		// the call below to command.Run() can unblock because its Stdin is the read half
		// of the pipe.
		r, w, err := os.Pipe()
		if err != nil {
			return err
		}
		go io.Copy(w, stdin)

		command.Stdin = r
	}
	if stdout != nil {
		command.Stdout = stdout
	}
	if stderr != nil {
		command.Stderr = stderr
	}
	return command.Run()
}