Function cmdsForMissingRemote

pkg/cmd/pr/checkout/checkout.go:204–259

(pr *api.PullRequest, baseURLOrName, repoHost, defaultBranch, protocol string, opts *CheckoutOptions)

}

func cmdsForMissingRemote(pr *api.PullRequest, baseURLOrName, repoHost, defaultBranch, protocol string, opts *CheckoutOptions) [][]string {
	var cmds [][]string
	ref := fmt.Sprintf("refs/pull/%d/head", pr.Number)

	if opts.Detach {
		cmds = append(cmds, []string{"fetch", baseURLOrName, ref, "--no-tags"})
		cmds = append(cmds, []string{"checkout", "--detach", "FETCH_HEAD"})
		return cmds
	}

	localBranch := pr.HeadRefName
	if opts.BranchName != "" {
		localBranch = opts.BranchName
	} else if pr.HeadRefName == defaultBranch {
		// avoid naming the new branch the same as the default branch
		localBranch = fmt.Sprintf("%s/%s", pr.HeadRepositoryOwner.Login, localBranch)
	}

	currentBranch, _ := opts.Branch()
	if localBranch == currentBranch {
		// PR head matches currently checked out branch
		cmds = append(cmds, []string{"fetch", baseURLOrName, ref, "--no-tags"})
		if opts.Force {
			cmds = append(cmds, []string{"reset", "--hard", "FETCH_HEAD"})
		} else {
			// TODO: check if non-fast-forward and suggest to use `--force`
			cmds = append(cmds, []string{"merge", "--ff-only", "FETCH_HEAD"})
		}
	} else {
		// TODO: check if non-fast-forward and suggest to use `--force`
		fetchCmd := []string{"fetch", baseURLOrName, fmt.Sprintf("%s:%s", ref, localBranch), "--no-tags"}
		if opts.Force {
			fetchCmd = append(fetchCmd, "--force")
		}
		cmds = append(cmds, fetchCmd)
		cmds = append(cmds, []string{"checkout", localBranch})
	}

	remote := baseURLOrName
	mergeRef := ref
	if pr.MaintainerCanModify && pr.HeadRepository != nil {
		headRepo := ghrepo.NewWithHost(pr.HeadRepositoryOwner.Login, pr.HeadRepository.Name, repoHost)
		remote = ghrepo.FormatRemoteURL(headRepo, protocol)
		mergeRef = fmt.Sprintf("refs/heads/%s", pr.HeadRefName)
	}
	if missingMergeConfigForBranch(opts.GitClient, localBranch) {
		// .remote is needed for `git pull` to work
		// .pushRemote is needed for `git push` to work, if user has set `remote.pushDefault`.
		// see https://git-scm.com/docs/git-config#Documentation/git-config.txt-branchltnamegtremote
		cmds = append(cmds, []string{"config", fmt.Sprintf("branch.%s.remote", localBranch), remote})
		cmds = append(cmds, []string{"config", fmt.Sprintf("branch.%s.pushRemote", localBranch), remote})
		cmds = append(cmds, []string{"config", fmt.Sprintf("branch.%s.merge", localBranch), mergeRef})
	}

	return cmds
}

func missingMergeConfigForBranch(client *git.Client, b string) bool {