Function fetchCommitMeta

tools/flakereport/github.go:240–292

fetchCommitMeta fetches commit title, author, and changed file list for a single commit SHA. Uses: GET /repos/{owner}/{repo}/commits/{sha}

(ctx context.Context, repo, sha string)

// fetchCommitMeta fetches commit title, author, and changed file list for a single commit SHA.
// Uses: GET /repos/{owner}/{repo}/commits/{sha}
func fetchCommitMeta(ctx context.Context, repo, sha string) (CommitMeta, error) {
	ctxTimeout, cancel := context.WithTimeout(ctx, 30*time.Second)
	defer cancel()

	cmd := exec.CommandContext(ctxTimeout, "gh", "api",
		fmt.Sprintf("/repos/%s/commits/%s", repo, sha),
	)

	output, err := cmd.Output()
	if err != nil {
		if exitErr, ok := err.(*exec.ExitError); ok {
			return CommitMeta{SHA: sha}, fmt.Errorf("gh api failed for commit %s: %w\nstderr: %s", sha, err, string(exitErr.Stderr))
		}
		return CommitMeta{SHA: sha}, fmt.Errorf("failed to execute gh command for commit %s: %w", sha, err)
	}

	var response struct {
		SHA    string `json:"sha"`
		Commit struct {
			Message string `json:"message"`
			Author  struct {
				Name string    `json:"name"`
				Date time.Time `json:"date"`
			} `json:"author"`
		} `json:"commit"`
		Files []struct {
			Filename string `json:"filename"`
		} `json:"files"`
	}

	if err := json.Unmarshal(output, &response); err != nil {
		return CommitMeta{SHA: sha}, fmt.Errorf("failed to parse commit response for %s: %w", sha, err)
	}

	// Extract just the first line of the commit message as the title
	title := response.Commit.Message
	if idx := strings.IndexByte(title, '\n'); idx >= 0 {
		title = title[:idx]
	}

	files := make([]string, 0, len(response.Files))
	for _, f := range response.Files {
		files = append(files, f.Filename)
	}

	return CommitMeta{
		SHA:         sha,
		Title:       title,
		Author:      response.Commit.Author.Name,
		CommittedAt: response.Commit.Author.Date,
		Files:       files,
	}, nil
}