func runTest(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if err := linkVendors(ctx, ""); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Testing...")

	cmdArgs := []string{"go", "test"}
	if len(ctx.String("tags")) > 0 {
		cmdArgs = append(cmdArgs, "-tags")
		cmdArgs = append(cmdArgs, ctx.String("tags"))
	}
	if ctx.IsSet("verbose") {
		cmdArgs = append(cmdArgs, "-v")
	}
	cmdArgs = append(cmdArgs, ctx.Args()...)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	log.Info("Command executed successfully!")
}

func runTest(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(setting.DefaultVendor)
	if !setting.Debug {
		defer os.RemoveAll(setting.DefaultVendor)
	}

	if err := linkVendors(ctx, ""); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Testing...")

	cmdArgs := []string{"go", "test"}
	cmdArgs = append(cmdArgs, ctx.Args()...)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	log.Info("Command executed successfully!")
}

func execCmd(gopath, curPath string, args ...string) error {
	oldGopath := os.Getenv("GOPATH")
	log.Info("Setting GOPATH to %s", gopath)

	sep := ":"
	if runtime.GOOS == "windows" {
		sep = ";"
	}

	if err := os.Setenv("GOPATH", gopath+sep+oldGopath); err != nil {
		if setting.LibraryMode {
			return fmt.Errorf("Fail to setting GOPATH: %v", err)
		}
		log.Error("", "Fail to setting GOPATH:")
		log.Fatal("", "\t"+err.Error())
	}
	if setting.HasGOPATHSetting {
		defer func() {
			log.Info("Setting GOPATH back to %s", oldGopath)
			os.Setenv("GOPATH", oldGopath)
		}()
	}

	cmd := exec.Command(args[0], args[1:]...)
	cmd.Dir = curPath
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	log.Info("===== application outputs start =====\n")

	err := cmd.Run()

	log.Info("====== application outputs end ======")
	return err
}

func buildBinary(ctx *cli.Context, args ...string) error {
	_, target, err := parseGopmfile(setting.GOPMFILE)
	if err != nil {
		return err
	}

	if err := linkVendors(ctx, ""); err != nil {
		return err
	}

	log.Info("Building...")

	cmdArgs := []string{"go", "build"}
	cmdArgs = append(cmdArgs, args...)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		return fmt.Errorf("fail to build program: %v", err)
	}

	if setting.IsWindowsXP {
		fName := path.Base(target)
		binName := fName + ".exe"
		os.Remove(binName)
		exePath := path.Join(setting.DefaultVendorSrc, target, binName)
		if base.IsFile(exePath) {
			if err := os.Rename(exePath, path.Join(setting.WorkDir, binName)); err != nil {
				return fmt.Errorf("fail to move binary: %v", err)
			}
		} else {
			log.Warn("No binary generated")
		}
	}
	return nil
}

// Download downloads remote package without version control.
func (n *Node) Download(ctx *cli.Context) ([]string, error) {
	for _, s := range services {
		if !strings.HasPrefix(n.DownloadURL, s.prefix) {
			continue
		}

		m := s.pattern.FindStringSubmatch(n.DownloadURL)
		if m == nil {
			if s.prefix != "" {
				return nil, errors.New("Cannot match package service prefix by given path")
			}
			continue
		}

		match := map[string]string{"downloadURL": n.DownloadURL}
		for i, n := range s.pattern.SubexpNames() {
			if n != "" {
				match[n] = m[i]
			}
		}
		return s.get(HttpClient, match, n, ctx)

	}

	if n.ImportPath != n.DownloadURL {
		return nil, errors.New("Didn't find any match service")
	}

	log.Info("Cannot match any service, getting dynamic...")
	return n.getDynamic(HttpClient, ctx)
}

func runBuild(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if err := buildBinary(ctx, ctx.Args()...); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Command executed successfully!")
}

func runInstall(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(setting.DefaultVendor)
	if !setting.Debug {
		defer os.RemoveAll(setting.DefaultVendor)
	}

	if err := linkVendors(ctx, ""); err != nil {
		errors.SetError(err)
		return
	}

	// Get target name.
	gfPath := path.Join(setting.WorkDir, setting.GOPMFILE)
	_, target, err := parseGopmfile(gfPath)
	if err != nil {
		errors.SetError(fmt.Errorf("fail to parse gopmfile: %v", err))
		return
	}

	log.Info("Installing...")

	cmdArgs := []string{"go", "install"}
	if ctx.Bool("verbose") {
		cmdArgs = append(cmdArgs, "-v")
	}
	cmdArgs = append(cmdArgs, target)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	log.Info("Command executed successfully!")
}

// ParseTarget guesses import path of current package if target is empty,
// otherwise simply returns the value it gets.
func ParseTarget(target string) string {
	if len(target) > 0 {
		return target
	}

	for _, gopath := range base.GetGOPATHs() {
		if strings.HasPrefix(setting.WorkDir, gopath) {
			target = strings.TrimPrefix(setting.WorkDir, path.Join(gopath, "src")+"/")
			log.Info("Guess import path: %s", target)
			return target
		}
	}
	return "."
}

func getPackages(target string, ctx *cli.Context, nodes []*doc.Node) error {
	if err := downloadPackages(target, ctx, nodes); err != nil {
		return err
	}
	if err := setting.SaveLocalNodes(); err != nil {
		return err
	}

	log.Info("%d package(s) downloaded, %d failed", downloadCount, failConut)
	if ctx.GlobalBool("strict") && failConut > 0 && !setting.LibraryMode {
		return fmt.Errorf("fail to download some packages")
	}
	return nil
}

// downloadPackage downloads package either use version control tools or not.
func downloadPackage(ctx *cli.Context, n *doc.Node) (*doc.Node, []string, error) {

	// fmt.Println(n.VerString())
	log.Info("Downloading package: %s", n.VerString())
	downloadCache.Set(n.VerString())

	vendor := base.GetTempDir()
	defer os.RemoveAll(vendor)

	var (
		err     error
		imports []string
		srcPath string
	)

	// Check if only need to use VCS tools.
	vcs := doc.GetVcsName(n.InstallGopath)
	// If update, gopath and VCS tools set then use VCS tools to update the package.
	if ctx.Bool("update") && (ctx.Bool("gopath") || ctx.Bool("local")) && len(vcs) > 0 {
		if err = n.UpdateByVcs(vcs); err != nil {
			return nil, nil, fmt.Errorf("fail to update by VCS(%s): %v", n.ImportPath, err)
		}
		srcPath = n.InstallGopath
	} else {
		if !n.IsGetDepsOnly || !n.IsExist() {
			// Get revision value from local records.
			n.Revision = setting.LocalNodes.MustValue(n.RootPath, "value")
			if err = n.DownloadGopm(ctx); err != nil {
				errors.AppendError(errors.NewErrDownload(n.ImportPath + ": " + err.Error()))
				failConut++
				os.RemoveAll(n.InstallPath)
				return nil, nil, nil
			}
		}
		srcPath = n.InstallPath
	}

	if n.IsGetDeps {
		imports, err = getDepList(ctx, n.ImportPath, srcPath, vendor)
		if err != nil {
			return nil, nil, fmt.Errorf("fail to list imports(%s): %v", n.ImportPath, err)
		}
		if setting.Debug {
			log.Debug("New imports: %v", imports)
		}
	}
	return n, imports, err
}

func (n *Node) CopyToGopath() error {
	if n.HasVcs() {
		log.Warn("Package in GOPATH has version control: %s", n.RootPath)
		return nil
	}

	os.RemoveAll(n.InstallGopath)
	if err := base.CopyDir(n.InstallPath, n.InstallGopath); err != nil {
		if setting.LibraryMode {
			return fmt.Errorf("Fail to copy to GOPATH: %v", err)
		}
		log.Error("", "Fail to copy to GOPATH:")
		log.Fatal("", "\t"+err.Error())
	}
	log.Info("Package copied to GOPATH: %s", n.RootPath)
	return nil
}

func runBuild(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	os.RemoveAll(setting.DefaultVendor)
	if !setting.Debug {
		defer os.RemoveAll(setting.DefaultVendor)
	}
	if err := buildBinary(ctx, ctx.Args()...); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Command executed successfully!")
}

// setup initializes and checks common environment variables.
func setup(ctx *cli.Context) (err error) {
	setting.Debug = ctx.GlobalBool("debug")
	log.NonColor = ctx.GlobalBool("noterm")
	log.Verbose = ctx.Bool("verbose")

	log.Info("App Version: %s", ctx.App.Version)

	setting.HomeDir, err = base.HomeDir()
	if err != nil {
		return fmt.Errorf("Fail to get home directory: %v", err)
	}
	setting.HomeDir = strings.Replace(setting.HomeDir, "\\", "/", -1)

	setting.InstallRepoPath = path.Join(setting.HomeDir, ".gopm/repos")
	if runtime.GOOS == "windows" {
		setting.IsWindows = true
	}
	os.MkdirAll(setting.InstallRepoPath, os.ModePerm)
	log.Info("Local repository path: %s", setting.InstallRepoPath)

	if !setting.LibraryMode || len(setting.WorkDir) == 0 {
		setting.WorkDir, err = os.Getwd()
		if err != nil {
			return fmt.Errorf("Fail to get work directory: %v", err)
		}
		setting.WorkDir = strings.Replace(setting.WorkDir, "\\", "/", -1)
	}
	setting.DefaultVendor = path.Join(setting.WorkDir, setting.VENDOR)
	setting.DefaultVendorSrc = path.Join(setting.DefaultVendor, "src")

	if !ctx.Bool("remote") {
		if ctx.Bool("local") {
			// gf, _, _, err := genGopmfile(ctx)
			// if err != nil {
			// 	return err
			// }
			// setting.InstallGopath = gf.MustValue("project", "local_gopath")
			// if ctx.Command.Name != "gen" {
			// 	if com.IsDir(setting.InstallGopath) {
			// 		log.Log("Indicated local GOPATH: %s", setting.InstallGopath)
			// 		setting.InstallGopath += "/src"
			// 	} else {
			// 		if setting.LibraryMode {
			// 			return fmt.Errorf("Local GOPATH does not exist or is not a directory: %s",
			// 				setting.InstallGopath)
			// 		}
			// 		log.Error("", "Invalid local GOPATH path")
			// 		log.Error("", "Local GOPATH does not exist or is not a directory:")
			// 		log.Error("", "\t"+setting.InstallGopath)
			// 		log.Help("Try 'go help gopath' to get more information")
			// 	}
			// }

		} else {
			// Get GOPATH.
			setting.InstallGopath = base.GetGOPATHs()[0]
			if base.IsDir(setting.InstallGopath) {
				log.Info("Indicated GOPATH: %s", setting.InstallGopath)
				setting.InstallGopath += "/src"
				setting.HasGOPATHSetting = true
			} else {
				if ctx.Bool("gopath") {
					return fmt.Errorf("Local GOPATH does not exist or is not a directory: %s",
						setting.InstallGopath)
				} else {
					// It's OK that no GOPATH setting
					// when user does not specify to use.
					log.Warn("No GOPATH setting available")
				}
			}
		}
	}

	setting.ConfigFile = path.Join(setting.HomeDir, ".gopm/data/gopm.ini")
	if err = setting.LoadConfig(); err != nil {
		return err
	}

	setting.PkgNameListFile = path.Join(setting.HomeDir, ".gopm/data/pkgname.list")
	if err = setting.LoadPkgNameList(); err != nil {
		return err
	}

	setting.LocalNodesFile = path.Join(setting.HomeDir, ".gopm/data/localnodes.list")
	if err = setting.LoadLocalNodes(); err != nil {
		return err
	}
	return nil
}

func runGen(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	gfPath := path.Join(setting.WorkDir, setting.GOPMFILE)
	if !setting.HasGOPATHSetting && !base.IsFile(gfPath) {
		log.Warn("Dependency list may contain package itself without GOPATH setting and gopmfile.")
	}
	gf, target, err := parseGopmfile(gfPath)
	if err != nil {
		errors.SetError(err)
		return
	}

	list, err := getDepList(ctx, target, setting.WorkDir, setting.DefaultVendor)
	if err != nil {
		errors.SetError(err)
		return
	}
	for _, name := range list {
		// Check if user has specified the version.
		if val := gf.MustValue("deps", name); len(val) == 0 {
			gf.SetValue("deps", name, "")
		}
	}

	// Check resources.
	if _, err = gf.GetValue("res", "include"); err != nil {
		resList := make([]string, 0, len(setting.CommonRes))
		for _, res := range setting.CommonRes {
			if base.IsExist(res) {
				resList = append(resList, res)
			}
		}
		gf.SetValue("res", "include", strings.Join(resList, "|"))
	}

	if err = setting.SaveGopmfile(gf, gfPath); err != nil {
		errors.SetError(err)
		return
	}

	if ctx.Bool("local") {
		localGopath := gf.MustValue("project", "local_gopath")
		if len(localGopath) == 0 {
			localGopath = "./vendor"
			gf.SetValue("project", "local_gopath", localGopath)
			if err = setting.SaveGopmfile(gf, gfPath); err != nil {
				errors.SetError(err)
				return
			}
		}

		for _, name := range []string{"src", "pkg", "bin"} {
			os.MkdirAll(path.Join(localGopath, name), os.ModePerm)
		}
	}

	log.Info("Generate gopmfile successfully!")
}

// DownloadGopm downloads remote package from gopm registry.
func (n *Node) DownloadGopm(ctx *cli.Context) error {
	// Fetch latest version, check if package has been changed.
	if n.Type == BRANCH && n.IsEmptyVal() {
		resp, err := http.Get(fmt.Sprintf("%s%s?pkgname=%s",
			setting.RegistryURL, setting.URL_API_REVISION, n.RootPath))
		if err != nil {
			return fmt.Errorf("fail to make request: %v", err)
		}
		if resp.StatusCode != 200 {
			var apiErr ApiError
			if err = json.NewDecoder(resp.Body).Decode(&apiErr); err != nil {
				return fmt.Errorf("fail to decode response JSON: %v", err)
			}
			return errors.New(apiErr.Error)
		}
		var apiResp ApiResponse
		if err = json.NewDecoder(resp.Body).Decode(&apiResp); err != nil {
			return fmt.Errorf("fail to decode response JSON: %v", err)
		}
		if n.Revision == apiResp.Sha {
			log.Info("Package(%s) hasn't been changed", n.RootPath)
			return nil
		}
		n.Revision = apiResp.Sha
	}

	resp, err := http.Get(fmt.Sprintf("%s%s?pkgname=%s&revision=%s",
		setting.RegistryURL, setting.URL_API_DOWNLOAD, n.RootPath, n.Value))
	if err != nil {
		return fmt.Errorf("fail to make request: %v", err)
	}
	if resp.StatusCode != 200 {
		var apiErr ApiError
		if err = json.NewDecoder(resp.Body).Decode(&apiErr); err != nil {
			return fmt.Errorf("fail to decode response JSON: %v", err)
		}
		return errors.New(apiErr.Error)
	}

	tmpPath := path.Join(setting.HomeDir, ".gopm/temp/archive",
		n.RootPath+"-"+base.ToStr(time.Now().Nanosecond())+".zip")
	defer os.Remove(tmpPath)
	if setting.Debug {
		log.Debug("Temp archive path: %s", tmpPath)
	}

	os.MkdirAll(path.Dir(tmpPath), os.ModePerm)
	fw, err := os.Create(tmpPath)
	if err != nil {
		return err
	}
	if _, err = io.Copy(fw, resp.Body); err != nil {
		return fmt.Errorf("fail to save archive: %v", err)
	}
	fw.Close()

	// Remove old files.
	os.RemoveAll(n.InstallPath)
	os.MkdirAll(path.Dir(n.InstallPath), os.ModePerm)

	var rootDir string
	var extractFn = func(fullName string, fi os.FileInfo) error {
		if len(rootDir) == 0 {
			rootDir = strings.Split(fullName, "/")[0]
		}
		return nil
	}

	if err := zip.ExtractToFunc(tmpPath, path.Dir(n.InstallPath), extractFn); err != nil {
		return fmt.Errorf("fail to extract archive: %v", err)
	} else if err = os.Rename(path.Join(path.Dir(n.InstallPath), rootDir),
		n.InstallPath); err != nil {
		return fmt.Errorf("fail to rename directory: %v", err)
	}
	return nil
}

func runBin(ctx *cli.Context) {
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	if len(ctx.Args()) != 1 {
		errors.SetError(fmt.Errorf("Incorrect number of arguments for command: should have 1"))
		return
	}

	// Check if given directory exists if specified.
	if ctx.IsSet("dir") && !base.IsDir(ctx.String("dir")) {
		errors.SetError(fmt.Errorf("Indicated path does not exist or not a directory"))
		return
	}

	// Parse package version.
	info := ctx.Args().First()
	pkgPath := info
	n := doc.NewNode(pkgPath, doc.BRANCH, "", true)
	if i := strings.Index(info, "@"); i > -1 {
		pkgPath = info[:i]
		var err error
		tp, val, err := validPkgInfo(info[i+1:])
		if err != nil {
			errors.SetError(err)
			return
		}
		n = doc.NewNode(pkgPath, tp, val, !ctx.Bool("download"))
	}

	// Check package name.
	if !strings.Contains(pkgPath, "/") {
		tmpPath, err := setting.GetPkgFullPath(pkgPath)
		if err != nil {
			errors.SetError(err)
			return
		}
		if tmpPath != pkgPath {
			n = doc.NewNode(tmpPath, n.Type, n.Value, n.IsGetDeps)
		}
	}

	if err := downloadPackages(".", ctx, []*doc.Node{n}); err != nil {
		errors.SetError(err)
		return
	}

	// Check if previous steps were successful.
	if !n.IsExist() {
		errors.SetError(fmt.Errorf("Download steps weren't successful"))
		return
	}

	tmpVendor := path.Join("vendor", path.Base(n.RootPath))
	os.RemoveAll(tmpVendor)
	os.RemoveAll(setting.VENDOR)
	// TODO: should use .gopm/temp path.
	if err := autoLink(n.InstallPath, tmpVendor); err != nil {
		errors.SetError(fmt.Errorf("Fail to link slef: %v", err))
		return
	}
	os.Chdir(tmpVendor)
	oldWorkDir := setting.WorkDir
	setting.WorkDir = path.Join(setting.WorkDir, tmpVendor)
	if !setting.Debug {
		defer func() {
			os.Chdir(oldWorkDir)
			os.RemoveAll("vendor")
			os.RemoveAll(setting.VENDOR)
		}()
	}

	// if err := buildBinary(ctx); err != nil {
	// 	errors.SetError(err)
	// 	return
	// }

	if err := linkVendors(ctx, n.ImportPath); err != nil {
		errors.SetError(err)
		return
	}

	log.Info("Installing...")

	cmdArgs := []string{"go", "install"}
	if ctx.Bool("verbose") {
		cmdArgs = append(cmdArgs, "-v")
	}
	cmdArgs = append(cmdArgs, n.ImportPath)
	if err := execCmd(setting.DefaultVendor, setting.WorkDir, cmdArgs...); err != nil {
		errors.SetError(fmt.Errorf("fail to run program: %v", err))
		return
	}

	gf, _, err := parseGopmfile(setting.GOPMFILE)
	if err != nil {
		errors.SetError(err)
		return
//.........这里部分代码省略.........

func runUpdate(ctx *cli.Context) {
	if setting.LibraryMode {
		errors.SetError(fmt.Errorf("Library mode does not support update command"))
		return
	}
	if err := setup(ctx); err != nil {
		errors.SetError(err)
		return
	}

	isAnythingUpdated := false
	localVerInfo := loadLocalVerInfo()

	// Get remote version info.
	var remoteVerInfo version
	if err := base.HttpGetJSON(doc.HttpClient, "http://gopm.io/VERSION.json", &remoteVerInfo); err != nil {
		log.Fatal("Fail to fetch VERSION.json: %v", err)
	}

	// Package name list.
	if remoteVerInfo.PackageNameList > localVerInfo.PackageNameList {
		log.Info("Updating pkgname.list...%v > %v",
			localVerInfo.PackageNameList, remoteVerInfo.PackageNameList)
		data, err := base.HttpGetBytes(doc.HttpClient, "https://raw.githubusercontent.com/gpmgo/docs/master/pkgname.list", nil)
		if err != nil {
			log.Warn("Fail to update pkgname.list: %v", err)
		} else {
			if err = ioutil.WriteFile(setting.PkgNameListFile, data, os.ModePerm); err != nil {
				log.Fatal("Fail to save pkgname.list: %v", err)
			}
			log.Info("Update pkgname.list to %v succeed!", remoteVerInfo.PackageNameList)
			isAnythingUpdated = true
		}
	}

	// Gopm.
	if remoteVerInfo.Gopm > setting.VERSION {
		log.Info("Updating gopm...%v > %v", setting.VERSION, remoteVerInfo.Gopm)

		tmpDir := base.GetTempDir()
		tmpBinPath := path.Join(tmpDir, "gopm")
		if runtime.GOOS == "windows" {
			tmpBinPath += ".exe"
		}

		os.MkdirAll(path.Dir(tmpBinPath), os.ModePerm)
		os.Remove(tmpBinPath)

		// Fetch code.
		args := []string{"bin", "-u", "-r", "-d=" + tmpDir}
		if ctx.Bool("verbose") {
			args = append(args, "-v")
		}
		args = append(args, "github.com/gpmgo/gopm")
		stdout, stderr, err := base.ExecCmd("gopm", args...)
		if err != nil {
			log.Fatal("Fail to execute 'bin -u -r -d=/Users/jiahuachen/.gopm/temp -v github.com/gpmgo/gopm: %s", stderr)
		}
		if len(stdout) > 0 {
			fmt.Print(stdout)
		}

		// Check if previous steps were successful.
		if !base.IsExist(tmpBinPath) {
			log.Error("Fail to continue command")
			log.Fatal("Previous steps weren't successful, no binary produced")
		}

		movePath, err := execPath()
		if err != nil {
			log.Fatal("Fail to get execute path: %v", err)
		}
		log.Info("New binary will be replaced for %s", movePath)
		// Move binary to given directory.
		if runtime.GOOS != "windows" {
			err := os.Rename(tmpBinPath, movePath)
			if err != nil {
				log.Fatal("Fail to move binary: %v", err)
			}
			os.Chmod(movePath+"/"+path.Base(tmpBinPath), os.ModePerm)
		} else {
			batPath := path.Join(tmpDir, "update.bat")
			f, err := os.Create(batPath)
			if err != nil {
				log.Error("Update", "Fail to generate bat file")
				log.Fatal("", err.Error())
			}
			f.WriteString("@echo off\r\n")
			f.WriteString(fmt.Sprintf("ping -n 1 127.0.0.1>nul\r\ncopy \"%v\" \"%v\" >nul\r\ndel \"%v\" >nul\r\n\r\n",
				tmpBinPath, movePath, tmpBinPath))
			f.Close()

			attr := &os.ProcAttr{
				Dir:   setting.WorkDir,
				Env:   os.Environ(),
				Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
			}

			if _, err = os.StartProcess(batPath, []string{batPath}, attr); err != nil {
				log.Error("Update", "Fail to start bat process")
//.........这里部分代码省略.........

// downloadPackages downloads packages with certain commit,
// if the commit is empty string, then it downloads all dependencies,
// otherwise, it only downloada package with specific commit only.
func downloadPackages(target string, ctx *cli.Context, nodes []*doc.Node) (err error) {
	for _, n := range nodes {
		// Check if it is a valid remote path or C.
		if n.ImportPath == "C" {
			continue
		} else if !base.IsValidRemotePath(n.ImportPath) {
			// Invalid import path.
			if setting.LibraryMode {
				errors.AppendError(errors.NewErrInvalidPackage(n.VerString()))
			}
			log.Error("Skipped invalid package: " + n.VerString())
			failConut++
			continue
		}

		// Valid import path.
		if isSubpackage(n.RootPath, target) {
			continue
		}

		// Indicates whether need to download package or update.
		if n.IsFixed() && n.IsExist() {
			n.IsGetDepsOnly = true
		}

		if downloadCache.Get(n.VerString()) {
			if !skipCache.Get(n.VerString()) {
				skipCache.Set(n.VerString())
				log.Debug("Skipped downloaded package: %s", n.VerString())
			}
			continue
		}

		if !ctx.Bool("update") {
			// Check if package has been downloaded.
			if n.IsExist() {
				if !skipCache.Get(n.VerString()) {
					skipCache.Set(n.VerString())
					log.Info("%s", n.InstallPath)
					log.Debug("Skipped installed package: %s", n.VerString())
				}

				// Only copy when no version control.
				if !copyCache.Get(n.VerString()) && (ctx.Bool("gopath") || ctx.Bool("local")) {
					copyCache.Set(n.VerString())
					if err = n.CopyToGopath(); err != nil {
						return err
					}
				}
				continue
			} else {
				setting.LocalNodes.SetValue(n.RootPath, "value", "")
			}
		}
		// Download package.
		nod, imports, err := downloadPackage(ctx, n)
		if err != nil {
			return err
		}
		for _, name := range imports {
			var gf *goconfig.ConfigFile
			gfPath := path.Join(n.InstallPath, setting.GOPMFILE)

			// Check if has gopmfile.
			if base.IsFile(gfPath) {
				log.Info("Found gopmfile: %s", n.VerString())
				var err error
				gf, _, err = parseGopmfile(gfPath)
				if err != nil {
					return fmt.Errorf("fail to parse gopmfile(%s): %v", gfPath, err)
				}
			}

			// Need to download dependencies.
			// Generate temporary nodes.
			nodes := make([]*doc.Node, len(imports))
			for i := range nodes {
				nodes[i] = doc.NewNode(name, doc.BRANCH, "", !ctx.Bool("download"))

				if gf == nil {
					continue
				}

				// Check if user specified the version.
				if v := gf.MustValue("deps", imports[i]); len(v) > 0 {
					nodes[i].Type, nodes[i].Value, err = validPkgInfo(v)
					if err != nil {
						return err
					}
				}
			}
			if err = downloadPackages(target, ctx, nodes); err != nil {
				return err
			}
		}

		// Only save package information with specific commit.
//.........这里部分代码省略.........