Function lockIsStale

packages/cli/src/utils/browser-manager.ts:272–300

* Decide whether `profileDir` holds a stale Chromium SingletonLock. Chromium * writes the lock as a symlink whose target is ` - `. If the * hostname differs from ours (different container) or the pid isn't alive, * the lock is left over from a prior process and Brave will refuse to l

(profileDir: string)

 * until it's removed.
 */
function lockIsStale(profileDir: string): boolean {
	const lockPath = path.join(profileDir, 'SingletonLock');
	let target: string;
	try {
		target = fs.readlinkSync(lockPath);
	} catch (err) {
		if ((err as NodeJS.ErrnoException).code === 'ENOENT') return false;
		// File exists but isn't a symlink we can read — unparseable, treat as
		// stale so we clear it rather than leave Brave wedged.
		return true;
	}

	// Hostnames can contain hyphens (Docker uses 12-char hex which can't, but
	// be defensive), so split from the right.
	const dash = target.lastIndexOf('-');
	if (dash < 0) return true;
	const host = target.slice(0, dash);
	const pid = Number(target.slice(dash + 1));

	if (host !== os.hostname()) return true;
	if (!Number.isFinite(pid) || pid <= 0) return true;

	try {
		process.kill(pid, 0);
		return false;
	} catch {
		return true;
	}
}

/**
 * Walk every profile under `~/.corebrain/browser-profiles/` and remove