// teardown is a helper function that we can use to
// stop and remove the build container, its supporting image,
// and the supporting service containers.
func (b *Builder) teardown() error {

	// stop and destroy the container
	if b.container != nil {

		// debugging
		log.Info("removing build container")

		// stop the container, ignore error message
		b.dockerClient.Containers.Stop(b.container.ID, 15)

		// remove the container, ignore error message
		if err := b.dockerClient.Containers.Remove(b.container.ID); err != nil {
			log.Errf("failed to delete build container %s", b.container.ID)
		}
	}

	// stop and destroy the container services
	for i, container := range b.services {
		// debugging
		log.Infof("removing service container %s", b.Build.Services[i])

		// stop the service container, ignore the error
		b.dockerClient.Containers.Stop(container.ID, 15)

		// remove the service container, ignore the error
		if err := b.dockerClient.Containers.Remove(container.ID); err != nil {
			log.Errf("failed to delete service container %s", container.ID)
		}
	}

	// destroy the underlying image
	if b.image != nil {
		// debugging
		log.Info("removing build image")

		if _, err := b.dockerClient.Images.Remove(b.image.ID); err != nil {
			log.Errf("failed to completely delete build image %s. %s", b.image.ID, err.Error())
		}
	}

	return nil
}

func (b *Builder) setup() error {

	// temp directory to store all files required
	// to generate the Docker image.
	dir, err := ioutil.TempDir("", "drone-")
	if err != nil {
		return err
	}

	// clean up after our mess.
	defer os.RemoveAll(dir)

	// make sure the image isn't empty. this would be bad
	if len(b.Build.Image) == 0 {
		log.Err("Fatal Error, No Docker Image specified")
		return fmt.Errorf("Error: missing Docker image")
	}

	// if we're using an alias for the build name we
	// should substitute it now
	if alias, ok := builders[b.Build.Image]; ok {
		b.Build.Image = alias.Tag
	}

	// if this is a local repository we should symlink
	// to the source code in our temp directory
	if b.Repo.IsLocal() {
		// this is where we used to use symlinks. We should
		// talk to the docker team about this, since copying
		// the entire repository is slow :(
		//
		// see https://github.com/dotcloud/docker/pull/3567

		//src := filepath.Join(dir, "src")
		//err = os.Symlink(b.Repo.Path, src)
		//if err != nil {
		//	return err
		//}

		src := filepath.Join(dir, "src")
		cmd := exec.Command("cp", "-a", b.Repo.Path, src)
		if err := cmd.Run(); err != nil {
			return err
		}
	}

	// start all services required for the build
	// that will get linked to the container.
	for _, service := range b.Build.Services {

		// Parse the name of the Docker image
		// And then construct a fully qualified image name
		owner, name, tag := parseImageName(service)
		cname := fmt.Sprintf("%s/%s:%s", owner, name, tag)

		// Get the image info
		img, err := b.dockerClient.Images.Inspect(cname)
		if err != nil {
			// Get the image if it doesn't exist
			if err := b.dockerClient.Images.Pull(cname); err != nil {
				return fmt.Errorf("Error: Unable to pull image %s", cname)
			}

			img, err = b.dockerClient.Images.Inspect(cname)
			if err != nil {
				return fmt.Errorf("Error: Invalid or unknown image %s", cname)
			}
		}

		// debugging
		log.Infof("starting service container %s", cname)

		// Run the contianer
		run, err := b.dockerClient.Containers.RunDaemonPorts(cname, img.Config.ExposedPorts)
		if err != nil {
			return err
		}

		// Get the container info
		info, err := b.dockerClient.Containers.Inspect(run.ID)
		if err != nil {
			// on error kill the container since it hasn't yet been
			// added to the array and would therefore not get
			// removed in the defer statement.
			b.dockerClient.Containers.Stop(run.ID, 10)
			b.dockerClient.Containers.Remove(run.ID)
			return err
		}

		// Add the running service to the list
		b.services = append(b.services, info)
	}

	if err := b.writeIdentifyFile(dir); err != nil {
		return err
	}

	if err := b.writeBuildScript(dir); err != nil {
		return err
	}
//.........这里部分代码省略.........