Golang log.Err函數代碼示例

func vet(path string) {
	// parse the Drone yml file
	script, err := script.ParseBuildFile(path)
	if err != nil {
		log.Err(err.Error())
		os.Exit(1)
		return
	}

	// print the Drone yml as parsed
	out, _ := goyaml.Marshal(script)
	log.Noticef("parsed yaml:\n%s", string(out))
}

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
	}
//.........這裏部分代碼省略.........

func run(path string) {
	dockerClient := docker.New()

	// parse the Drone yml file
	s, err := script.ParseBuildFile(path)
	if err != nil {
		log.Err(err.Error())
		os.Exit(1)
		return
	}

	// get the repository root directory
	dir := filepath.Dir(path)
	code := repo.Repo{
		Name:   dir,
		Branch: "HEAD", // should we do this?
		Path:   dir,
	}

	// does the local repository match the
	// $GOPATH/src/{package} pattern? This is
	// important so we know the target location
	// where the code should be copied inside
	// the container.
	if gopath, ok := getRepoPath(dir); ok {
		code.Dir = gopath

	} else if gopath, ok := getGoPath(dir); ok {
		// in this case we found a GOPATH and
		// reverse engineered the package path
		code.Dir = gopath

	} else {
		// otherwise just use directory name
		code.Dir = filepath.Base(dir)
	}

	// this is where the code gets uploaded to the container
	// TODO move this code to the build package
	code.Dir = filepath.Join("/var/cache/drone/src", filepath.Clean(code.Dir))

	// track all build results
	var builders []*build.Builder

	// ssh key to import into container
	var key []byte
	if len(*identity) != 0 {
		key, err = ioutil.ReadFile(*identity)
		if err != nil {
			fmt.Printf("[Error] Could not find or read identity file %s\n", *identity)
			os.Exit(1)
			return
		}
	}

	builds := []*script.Build{s}

	// loop through and create builders
	for _, b := range builds { //script.Builds {
		builder := build.New(dockerClient)
		builder.Build = b
		builder.Repo = &code
		builder.Key = key
		builder.Stdout = os.Stdout
		builder.Timeout = *timeout

		if *parallel == true {
			var buf bytes.Buffer
			builder.Stdout = &buf
		}

		builders = append(builders, builder)
	}

	switch *parallel {
	case false:
		runSequential(builders)
	case true:
		runParallel(builders)
	}

	// if in parallel mode, print out the buffer
	// if we had a failure
	for _, builder := range builders {
		if builder.BuildState.ExitCode == 0 {
			continue
		}

		if buf, ok := builder.Stdout.(*bytes.Buffer); ok {
			log.Noticef("printing stdout for failed build %s", builder.Build.Name)
			println(buf.String())
		}
	}

	// this exit code is initially 0 and will
	// be set to an error code if any of the
	// builds fail.
	var exit int

	fmt.Printf("\nDrone Build Results \033[90m(%v)\033[0m\n", len(builders))
//.........這裏部分代碼省略.........