nextcloud / server

	 * @return \OCP\Files\Folder

	 * @throws NotFoundException

	 */

	private function getAppDataFolder() {

		$instanceId = $this->config->getSystemValue('instanceid', null);

		if ($instanceId === null) {

			throw new NotFoundException();

		}

		return $this->root->get('appdata_'.$instanceId);

	}

}

	 * @return Key

	 * @throws \RuntimeException

	 */

	public function getSystemKey() {

		$instanceId = $this->config->getSystemValue('instanceid', null);

		if ($instanceId === null) {

			throw new \RuntimeException('no instance id!');

		}

		return $this->retrieveKey('system-' . $instanceId);

	}

}