Function acquireWindowsBinaryLock

pkg/npm/install.js:300–327

(destDir)

}

function acquireWindowsBinaryLock(destDir) {
  const lockPath = path.join(destDir, WINDOWS_PAIR_LOCK_NAME);
  const token = crypto.randomBytes(16).toString('hex');
  const deadline = Date.now() + WINDOWS_PAIR_LOCK_WAIT_MS;
  for (;;) {
    try {
      fs.mkdirSync(lockPath, { mode: 0o700 });
      try {
        fs.writeFileSync(
          path.join(lockPath, 'owner.json'),
          `${JSON.stringify({ pid: process.pid, token })}\n`,
          { encoding: 'utf8', flag: 'wx', mode: 0o600 },
        );
      } catch (err) {
        fs.rmSync(lockPath, { recursive: true, force: true });
        throw err;
      }
      return { lockPath, token };
    } catch (err) {
      if (err.code !== 'EEXIST') throw err;
      if (tryReclaimBinaryLock(lockPath, token)) continue;
      if (Date.now() >= deadline) {
        throw new Error('timed out waiting for Windows package-cache publication lock');
      }
      sleepSync(WINDOWS_PAIR_LOCK_POLL_MS);
    }
  }
}

function releaseWindowsBinaryLock(lock) {
  const owner = readBinaryLockOwner(lock.lockPath);