lock, err := os.OpenFile(lockPath, os.O_CREATE|os.O_RDWR, 0666)
	if err != nil {
		return 0, err
	}
	defer lock.Close()
	if err := syscall.Flock(int(lock.Fd()), syscall.LOCK_EX); err != nil {
		return 0, err
	}

	// In case we're booting a device or emulator alongside all.bash, wait for
	// it to be ready. adb wait-for-device is not enough, we have to
	// wait for sys.boot_completed.

	lock, err = os.OpenFile(lockName, os.O_CREATE|os.O_RDONLY, 0666)
	if err != nil {
		return 1, err
	}
	if err := syscall.Flock(int(lock.Fd()), syscall.LOCK_EX); err != nil {
		return 1, err
	}

	if goarch := os.Getenv("GOARCH"); goarch == "arm64" {
		err = runOnDevice(appdir)
	} else {
		err = runOnSimulator(appdir)
	}
	if err != nil {