Function getRepoDefaultBranch

pkg/cli/update_workflows.go:389–418

getRepoDefaultBranch fetches the default branch name for a repository.

(ctx context.Context, repo string)

// getRepoDefaultBranch fetches the default branch name for a repository.
func getRepoDefaultBranch(ctx context.Context, repo string) (string, error) {
	output, err := workflow.RunGHContext(ctx, "Fetching repo info...", "api", "/repos/"+repo, "--jq", ".default_branch")
	if err != nil && gitutil.IsAuthError(err.Error()) {
		updateLog.Printf("GitHub API auth failed for %s, retrying without token", repo)
		body, fallbackErr := fetchPublicGitHubAPI(ctx, "/repos/"+repo)
		if fallbackErr != nil {
			return "", fmt.Errorf("failed (with token: %w; without token: %w)", err, fallbackErr)
		}
		var result struct {
			DefaultBranch string `json:"default_branch"`
		}
		if fallbackErr = json.Unmarshal(body, &result); fallbackErr != nil {
			return "", fmt.Errorf("failed to parse repo response: %w", fallbackErr)
		}
		if result.DefaultBranch == "" {
			return "", fmt.Errorf("empty default branch returned for %s", repo)
		}
		return result.DefaultBranch, nil
	}
	if err != nil {
		return "", err
	}

	branch := strings.TrimSpace(string(output))
	if branch == "" {
		return "", fmt.Errorf("empty default branch returned for %s", repo)
	}

	return branch, nil
}

// getLatestBranchCommitSHA fetches the latest commit SHA for a given branch.
func getLatestBranchCommitSHA(ctx context.Context, repo, branch string) (string, error) {