Method ResolveRefCommit

repository/git.go:225–244

ResolveRefCommit returns the commit pointed to by the given ref, which may be a remote ref. This differs from GetCommitHash which only works on exact matches, in that it will try to intelligently handle the scenario of a ref not existing locally, but being known to exist in a remote repo. This met

(ref string)

// reviewee, while GetCommitHash should be used when the encompassing command should only be
// performed by the reviewee.
func (repo *GitRepo) ResolveRefCommit(ref string) (string, error) {
	if err := repo.VerifyGitRef(ref); err == nil {
		return repo.GetCommitHash(ref)
	}
	if strings.HasPrefix(ref, "refs/heads/") {
		// The ref is a branch. Check if it exists in exactly one remote
		pattern := strings.Replace(ref, "refs/heads", "**", 1)
		matchingOutput, err := repo.runGitCommand("for-each-ref", "--format=%(refname)", pattern)
		if err != nil {
			return "", err
		}
		matchingRefs := strings.Split(matchingOutput, "\n")
		if len(matchingRefs) == 1 && matchingRefs[0] != "" {
			// There is exactly one match
			return repo.GetCommitHash(matchingRefs[0])
		}
		return "", fmt.Errorf("Unable to find a git ref matching the pattern %q", pattern)
	}
	return "", fmt.Errorf("Unknown git ref %q", ref)
}

// GetCommitMessage returns the message stored in the commit pointed to by the given ref.
func (repo *GitRepo) GetCommitMessage(ref string) (string, error) {