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
	}
}

// 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 {

	defer b.dockerClient.CloseIdleConnections()

	// 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 main() {
	log.SetPriority(log.LOG_NOTICE)

	// Parses flags. The only flag that can be passed into the
	// application is the location of the configuration (.toml) file.
	var conf string
	flag.StringVar(&conf, "config", "", "")
	flag.Parse()

	config.Var(&nodes, "worker-nodes")

	// Parses config data. The config data can be stored in a config
	// file (.toml format) or environment variables, or a combo.
	config.SetPrefix("DRONE_")
	err := config.Parse(conf)
	if err != nil {
		log.Errf("Unable to parse config: %v", err)
		os.Exit(1)
	}

	// Setup the remote services. We need to execute these to register
	// the remote plugins with the system.
	//
	// NOTE: this cannot be done via init() because they need to be
	//       executed after config.Parse
	bitbucket.Register()
	github.Register()
	gitlab.Register()
	gogs.Register()

	caps = map[string]bool{}
	caps[capability.Registration] = *open

	// setup the database and cancel all pending
	// commits in the system.
	db = database.MustConnect(*driver, *datasource)
	go database.NewCommitstore(db).KillCommits()

	// Create the worker, director and builders
	workers = pool.New()
	worker = director.New()

	if nodes == nil || len(nodes) == 0 {
		workers.Allocate(docker.New())
		workers.Allocate(docker.New())
	} else {
		for _, node := range nodes {
			if strings.HasPrefix(node, "unix://") {
				workers.Allocate(docker.NewHost(node))
			} else if *dockercert != "" && *dockerkey != "" {
				workers.Allocate(docker.NewHostCertFile(node, *dockercert, *dockerkey))
			} else {
				fmt.Println(DockerTLSWarning)
				workers.Allocate(docker.NewHost(node))
			}
		}
	}

	pub = pubsub.NewPubSub()

	// create handler for static resources
	assets := rice.MustFindBox("app").HTTPBox()
	assetserve := http.FileServer(rice.MustFindBox("app").HTTPBox())
	http.Handle("/robots.txt", assetserve)
	http.Handle("/static/", http.StripPrefix("/static", assetserve))
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write(assets.MustBytes("index.html"))
	})

	// create the router and add middleware
	mux := router.New()
	mux.Use(middleware.Options)
	mux.Use(ContextMiddleware)
	mux.Use(middleware.SetHeaders)
	mux.Use(middleware.SetUser)
	http.Handle("/api/", mux)

	// start the http server in either http or https mode,
	// depending on whether a certificate was provided.
	if len(*sslcrt) == 0 {
		panic(http.ListenAndServe(*port, nil))
	} else {
		panic(http.ListenAndServeTLS(*port, *sslcrt, *sslkey, nil))
	}
}

//.........這裏部分代碼省略.........
		src := filepath.Join(dir, "src")
		cmd := exec.Command("cp", "-a", b.Repo.Path, src)
		if err := cmd.Run(); err != nil {
			return fmt.Errorf("Error: Unable to copy repository. %s", 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.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 or it's :latest tag
	if _, err := b.dockerClient.Images.Inspect(b.Build.Image); err == docker.ErrNotFound || strings.HasSuffix(b.Build.Image, ":latest") {
		// download the image if it doesn't exist
		if err := b.dockerClient.Images.Pull(b.Build.Image); err != nil {
			return fmt.Errorf("Error: Unable to pull image %s. %s", b.Build.Image, 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
		log.Errf("failed to verify build image %s", id)
		return err
	}

	return nil
}

// TODO this has gotten a bit out of hand. refactor input params
func run(path, identity, sshconfig, dockerhost, dockercert, dockerkey string, publish, deploy, privileged bool) (int, error) {
	dockerClient, err := docker.NewHostCertFile(dockerhost, dockercert, dockerkey)
	if err != nil {
		log.Err(err.Error())
		return EXIT_STATUS, err
	}

	// parse the private environment variables
	envs := getParamMap("DRONE_ENV_")

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

	// inject private environment variables into build script
	for key, val := range envs {
		s.Env = append(s.Env, key+"="+val)
	}

	if deploy == false {
		s.Publish = nil
	}
	if publish == false {
		s.Deploy = nil
	}

	// get the repository root directory
	dir := filepath.Dir(path)
	code := repo.Repo{
		Name:   filepath.Base(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))

	// 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)
			return EXIT_STATUS, err
		}
	}

	// ssh-config file to import into container
	var sshconfigcontent []byte
	if len(sshconfig) != 0 {
		sshconfigcontent, err = ioutil.ReadFile(sshconfig)
		if err != nil {
			fmt.Printf("[Error] Could not find or read ssh-config file %s\n", sshconfig)
			return EXIT_STATUS, err
		}
	}

	// loop through and create builders
	builder := build.New(dockerClient)
	builder.Build = s
	builder.Repo = &code
	builder.Key = key
	builder.SSHConfig = sshconfigcontent
	builder.Stdout = os.Stdout
	builder.Timeout = 300 * time.Minute
	builder.Privileged = privileged

	// execute the build
	if err := builder.Run(); err != nil {
		log.Errf("Error executing build: %s", err.Error())
		return EXIT_STATUS, err
	}

	fmt.Printf("\nDrone Build Results \033[90m(%s)\033[0m\n", dir)

	// loop through and print results

//.........這裏部分代碼省略.........