Golang log.Errf函數代碼示例

func (b *Builder) Run() error {
	// teardown will remove the Image and stop and
	// remove the service containers after the
	// build is done running.
	defer b.teardown()

	// setup will create the Image and supporting
	// service containers.
	if err := b.setup(); err != nil {
		return err
	}

	// make sure build state is not nil
	b.BuildState = &BuildState{}
	b.BuildState.ExitCode = 0
	b.BuildState.Started = time.Now().UTC().Unix()

	c := make(chan error, 1)
	go func() {
		c <- b.run()
	}()

	// wait for either a) the job to complete or b) the job to timeout
	select {
	case err := <-c:
		return err
	case <-time.After(b.Timeout):
		log.Errf("time limit exceeded for build %s", b.Build.Name)
		b.BuildState.ExitCode = 124
		b.BuildState.Finished = time.Now().UTC().Unix()
		return nil
	}
}

func runSequential(builders []*build.Builder) {
	// loop through and execute each build
	for _, builder := range builders {
		if err := builder.Run(); err != nil {
			log.Errf("Error executing build: %s", err.Error())
			os.Exit(1)
		}
	}
}

// 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
}

//.........這裏部分代碼省略.........
		}
	}

	// 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
	}

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

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

	// debugging
	log.Info("creating build image")

	// check for build container (ie bradrydzewski/go:1.2)
	// and download if it doesn't already exist
	if _, err := b.dockerClient.Images.Inspect(b.Build.Image); err == docker.ErrNotFound {
		// download the image if it doesn't exist
		if err := b.dockerClient.Images.Pull(b.Build.Image); err != nil {
			return err
		}
	} else if err != nil {
		log.Errf("failed to inspect image %s", b.Build.Image)
	}

	// create the Docker image
	id := createUID()
	if err := b.dockerClient.Images.Build(id, dir); err != nil {
		return err
	}

	// debugging
	log.Infof("copying repository to %s", b.Repo.Dir)

	// get the image details
	b.image, err = b.dockerClient.Images.Inspect(id)
	if err != nil {
		// if we have problems with the image make sure
		// we remove it before we exit
		b.dockerClient.Images.Remove(id)
		return err
	}

	return nil
}