Function tryAcquireGuard

src/utils/fs-lock-sync.ts:127–157

(
  lockDir: string,
  purpose: string,
  leaseMs: number,
  now: number,
)

}

function tryAcquireGuard(
  lockDir: string,
  purpose: string,
  leaseMs: number,
  now: number,
): AcquiredFsLockSync | null {
  const guardDir = guardDirForLockDir(lockDir);
  const guardOwner: FsLockOwner = {
    token: randomUUID(),
    pid: process.pid,
    purpose: `${purpose}:guard`,
    acquiredAtMs: now,
    expiresAtMs: now + leaseMs,
  };

  try {
    return createLock(guardDir, guardOwner);
  } catch (error) {
    if ((error as NodeJS.ErrnoException).code !== 'EEXIST') {
      return null;
    }
    if (!tryRecoverExpiredLockDir(guardDir, guardOwner.purpose, now, leaseMs)) {
      return null;
    }
    try {
      return createLock(guardDir, guardOwner);
    } catch {
      return null;
    }
  }
}

export function tryAcquireFsLockSync(
  options: TryAcquireFsLockSyncOptions,