Function gitCommonDir

src/sync/worktree.ts:58–73

(dir: string)

 * from a nested repo the parent index already covers. Null when not a repo.
 */
export function gitCommonDir(dir: string): string | null {
  try {
    const out = execFileSync('git', ['rev-parse', '--git-common-dir'], {
      cwd: dir,
      encoding: 'utf8',
      stdio: ['ignore', 'pipe', 'ignore'],
      windowsHide: true,
      timeout: 5000, // same rationale as gitWorktreeRoot
    }).trim();
    if (!out) return null;
    // `--git-common-dir` is relative to cwd unless already absolute.
    return realpath(path.isAbsolute(out) ? out : path.resolve(dir, out));
  } catch {
    return null;
  }
}

export interface WorktreeIndexMismatch {
  /** The git working tree the command was run from. */