Function acquireLock

scripts/watch.js:183–207

* Acquire the state lock via atomic mkdir of a lock directory. Retries up to * LOCK_RETRIES times at LOCK_RETRY_MS intervals. A lock older than * LOCK_STALE_MS by mtime is considered abandoned and removed.

()

 * LOCK_STALE_MS by mtime is considered abandoned and removed.
 */
function acquireLock() {
  if (!fs.existsSync(PLANNING_DIR)) {
    fs.mkdirSync(PLANNING_DIR, { recursive: true });
  }
  for (let attempt = 0; attempt < LOCK_RETRIES; attempt++) {
    try {
      fs.mkdirSync(LOCK_PATH);
      return true;
    } catch (err) {
      if (err.code !== 'EEXIST') throw err;
      try {
        const stat = fs.statSync(LOCK_PATH);
        if (Date.now() - stat.mtimeMs > LOCK_STALE_MS) {
          fs.rmdirSync(LOCK_PATH);
          continue;
        }
      } catch {
        // Lock vanished between mkdir and stat; retry immediately.
        continue;
      }
      sleepMs(LOCK_RETRY_MS);
    }
  }
  return false;
}

function releaseLock() {
  try {