func (tool *codeReviewTool) FinaliseRelease(v *version.Version) (action.Action, error) {
	// Get a GitHub client.
	config, err := LoadConfig()
	if err != nil {
		return nil, err
	}
	client := ghutil.NewClient(config.Token())

	owner, repo, err := git.ParseUpstreamURL()
	if err != nil {
		return nil, err
	}

	// Get the relevant review milestone.
	releaseString := v.BaseString()
	task := fmt.Sprintf("Get GitHub review milestone for release %v", releaseString)
	log.Run(task)
	milestone, err := milestoneForVersion(config, owner, repo, v)
	if err != nil {
		return nil, errs.NewError(task, err)
	}
	if milestone == nil {
		log.Warn(fmt.Sprintf(
			"Weird, GitHub review milestone for release %v not found", releaseString))
		return nil, nil
	}

	// Close the milestone unless there are some issues open.
	task = fmt.Sprintf(
		"Make sure the review milestone for release %v can be closed", releaseString)
	if num := *milestone.OpenIssues; num != 0 {
		return nil, errs.NewError(
			task,
			fmt.Errorf(
				"review milestone for release %v cannot be closed: %v issue(s) open",
				releaseString, num))
	}

	milestoneTask := fmt.Sprintf("Close GitHub review milestone for release %v", releaseString)
	log.Run(milestoneTask)
	milestone, _, err = client.Issues.EditMilestone(owner, repo, *milestone.Number, &github.Milestone{
		State: github.String("closed"),
	})
	if err != nil {
		return nil, errs.NewError(milestoneTask, err)
	}

	// Return a rollback function.
	return action.ActionFunc(func() error {
		log.Rollback(milestoneTask)
		task := fmt.Sprintf("Reopen GitHub review milestone for release %v", releaseString)
		_, _, err := client.Issues.EditMilestone(owner, repo, *milestone.Number, &github.Milestone{
			State: github.String("open"),
		})
		if err != nil {
			return errs.NewError(task, err)
		}
		return nil
	}), nil
}

func (tool *codeReviewTool) InitialiseRelease(v *version.Version) (action.Action, error) {
	// Get necessary config.
	config, err := LoadConfig()
	if err != nil {
		return nil, err
	}

	owner, repo, err := git.ParseUpstreamURL()
	if err != nil {
		return nil, err
	}

	// Check whether the review milestone exists or not.
	// People can create milestones manually, so this makes the thing more robust.
	task := fmt.Sprintf("Check whether GitHub review milestone exists for release %v", v.BaseString())
	log.Run(task)
	milestone, err := milestoneForVersion(config, owner, repo, v)
	if err != nil {
		return nil, errs.NewError(task, err)
	}
	if milestone != nil {
		// Milestone already exists, we are done.
		log.Log(fmt.Sprintf("GitHub review milestone '%v' already exists", milestoneTitle(v)))
		return nil, nil
	}

	// Create the review milestone.
	_, act, err := createMilestone(config, owner, repo, v)
	return act, err
}

func (tracker *issueTracker) getVersionResource(ver *version.Version) (*jira.Version, error) {
	var (
		projectKey  = tracker.config.ProjectKey()
		versionName = ver.ReleaseTagString()
		api         = newClient(tracker.config)
	)

	// In case the resource cache is empty, fill it.
	if tracker.versionCache == nil {
		vs, _, err := api.Projects.ListVersions(projectKey)
		if err != nil {
			return nil, err
		}

		m := make(map[string]*jira.Version, len(vs))
		for _, v := range vs {
			m[v.Name] = v
		}
		tracker.versionCache = m
	}

	// Return the resource we are looking for.
	if res, ok := tracker.versionCache[versionName]; ok {
		return res, nil
	}
	return nil, nil
}

// getOrCreateMilestone just calls ghissues.GetOrCreateMilestoneForTitle
// using the client and config as contained in this issueTracker.
func (tracker *issueTracker) getOrCreateMilestone(
	v *version.Version,
) (*github.Milestone, action.Action, error) {

	var (
		client = tracker.newClient()
		owner  = tracker.config.GitHubOwner
		repo   = tracker.config.GitHubRepository
		title  = v.BaseString()

		milestone *github.Milestone
		act       action.Action
		err       error
	)
	withRequestAllocated(func() {
		milestone, act, err = ghissues.GetOrCreateMilestoneForTitle(client, owner, repo, title)
	})
	return milestone, act, err
}

func runMain() (err error) {
	// Load repo config.
	gitConfig, err := git.LoadConfig()
	if err != nil {
		return err
	}
	var (
		remote        = gitConfig.RemoteName
		trunkBranch   = gitConfig.TrunkBranchName
		releaseBranch = gitConfig.ReleaseBranchName
		stagingBranch = gitConfig.StagingBranchName
	)

	// Fetch the remote repository.
	if !flagNoFetch {
		task := "Fetch the remote repository"
		log.Run(task)
		if err := git.UpdateRemotes(remote); err != nil {
			return errs.NewError(task, err)
		}
	}

	// Make sure trunk is up to date.
	task := fmt.Sprintf("Make sure that branch '%v' is up to date", trunkBranch)
	if err := git.CheckOrCreateTrackingBranch(trunkBranch, remote); err != nil {
		return errs.NewError(task, err)
	}

	// Make sure the staging branch is up to date, in case it exists.
	//
	// We check stage here as well since it is otherwise checked later
	// in releases.ListNewTrunkCommits(), which is usually called in
	// release.PromptUserToConfirmStart().
	task = fmt.Sprintf("Make sure that branch '%v' is up to date", stagingBranch)
	if err := git.CheckOrCreateTrackingBranch(stagingBranch, remote); err != nil {
		// The staging branch actually doesn't need to exist.
		if _, ok := err.(*git.ErrRefNotFound); !ok {
			return errs.NewError(task, err)
		}
	}

	// Make sure that the release branch does not exist.
	task = fmt.Sprintf("Make sure that branch '%v' does not exist", releaseBranch)
	if err := git.EnsureBranchNotExist(releaseBranch, remote); err != nil {
		return errs.NewError(task, err)
	}

	// Get the current trunk version string.
	task = "Get the current trunk version string"
	trunkVersion, err := version.GetByBranch(trunkBranch)
	if err != nil {
		return errs.NewError(task, err)
	}

	// Get the next trunk version (the future release version).
	var nextTrunkVersion *version.Version
	if !flagNextTrunk.Zero() {
		// Make sure it's only major, minor and patch that are set.
		// Make sure the new version is actually incrementing the current one.
		var (
			current = trunkVersion
			next    = flagNextTrunk
		)

		var part string
		switch {
		case len(next.Pre) != 0:
			part = "Pre"
		case len(next.Build) != 0:
			part = "Build"
		}
		if part != "" {
			return fmt.Errorf("invalid future version string: %v version part cannot be set", part)
		}

		if current.GE(next.Version) {
			return fmt.Errorf("future version string not an increment: %v <= %v", next, current)
		}

		nextTrunkVersion = &flagNextTrunk
	} else {
		nextTrunkVersion = trunkVersion.IncrementMinor()
	}

	// Make sure the next trunk version has the right format.
	nextTrunkVersion, err = nextTrunkVersion.ToTrunkVersion()
	if err != nil {
		return err
	}

	// Fetch the stories from the issue tracker.
	tracker, err := modules.GetIssueTracker()
	if err != nil {
		return errs.NewError(task, err)
	}
	release := tracker.NextRelease(trunkVersion, nextTrunkVersion)

	// Prompt the user to confirm the release.
	fmt.Printf(`
You are about to start a new release branch.
//.........这里部分代码省略.........

// issuesByRelease returns the issues assigned to the relevant milestone.
func (tracker *issueTracker) issuesByRelease(v *version.Version) ([]*github.Issue, error) {
	return tracker.searchIssues(`milestone:"%v"`, v.BaseString())
}

func milestoneTitle(v *version.Version) string {
	return fmt.Sprintf("%v-review", v.BaseString())
}

func (tracker *issueTracker) issuesByRelease(v *version.Version) ([]*jira.Issue, error) {
	label := v.ReleaseTagString()
	return tracker.searchIssues("labels = %v", label)
}

func getReleaseLabel(ver *version.Version) string {
	return fmt.Sprintf("release-%v", ver.BaseString())
}