Function resolveRefToSHAViaGit

pkg/parser/remote_fetch.go:453–504

resolveRefToSHAViaGit resolves a git ref to SHA using git ls-remote This is a fallback for when GitHub API authentication fails

(owner, repo, ref, host string)

// resolveRefToSHAViaGit resolves a git ref to SHA using git ls-remote
// This is a fallback for when GitHub API authentication fails
func resolveRefToSHAViaGit(owner, repo, ref, host string) (string, error) {
	remoteLog.Printf("Attempting git ls-remote fallback for ref resolution: %s/%s@%s", owner, repo, ref)

	var githubHost string
	if host != "" {
		githubHost = "https://" + host
	} else {
		githubHost = GetGitHubHostForRepo(owner, repo)
	}
	repoURL := fmt.Sprintf("%s/%s/%s.git", githubHost, owner, repo)

	// Try to resolve the ref using git ls-remote
	// Format: git ls-remote <repo> <ref>
	cmd := exec.Command("git", "ls-remote", repoURL, ref)
	output, err := cmd.Output()
	if err != nil {
		// If exact ref doesn't work, try with refs/heads/ and refs/tags/ prefixes
		for _, prefix := range []string{"refs/heads/", "refs/tags/"} {
			cmd = exec.Command("git", "ls-remote", repoURL, prefix+ref)
			output, err = cmd.Output()
			if err == nil && len(output) > 0 {
				break
			}
		}

		if err != nil {
			return "", fmt.Errorf("failed to resolve ref via git ls-remote: %w", err)
		}
	}

	// Parse the output: "<sha> <ref>"
	lines := strings.Split(strings.TrimSpace(string(output)), "\n")
	if len(lines) == 0 || lines[0] == "" {
		return "", fmt.Errorf("no matching ref found for %s", ref)
	}

	// Extract SHA from the first line
	parts := strings.Fields(lines[0])
	if len(parts) < 1 {
		return "", errors.New("invalid git ls-remote output format")
	}

	sha := parts[0]

	// Validate it's a valid SHA
	if len(sha) != 40 || !gitutil.IsHexString(sha) {
		return "", fmt.Errorf("invalid SHA format from git ls-remote: %s", sha)
	}

	remoteLog.Printf("Successfully resolved ref via git ls-remote: %s/%s@%s -> %s", owner, repo, ref, sha)
	return sha, nil
}

// resolveRefToSHA resolves a git ref (branch, tag, or SHA) to its commit SHA
func resolveRefToSHA(owner, repo, ref, host string) (string, error) {