Method doExecute

/**
 * Internal function to execute the command.
 *
 * @param   InputInterface   $input   The input to inject into the command.
 * @param   OutputInterface  $output  The output to inject into the command.
 *
 * @return  integer  The command exit code
 *
 * @since   4.0.0
 */
protected function doExecute(InputInterface $input, OutputInterface $output) : int
{
    $symfonyStyle = new SymfonyStyle($input, $output);
    $symfonyStyle->title('Fetching Extension Updates');
    // Get the update cache time
    $component = ComponentHelper::getComponent('com_installer');
    $cache_timeout = 3600 * (int) $component->getParams()->get('cachetimeout', 6);
    // Find all updates
    $ret = Updater::getInstance()->findUpdates(0, $cache_timeout);
    if ($ret) {
        $symfonyStyle->note('There are available updates to apply');
        $symfonyStyle->success('Check complete.');
    } else {
        $symfonyStyle->success('There are no available updates');
    }
    return Command::SUCCESS;
}