private function createContainer(InputInterface $input, OutputInterface $output)
{
$basePath = rtrim($this->getBasePath(), DIRECTORY_SEPARATOR);
$container = new ContainerBuilder();
$container->setParameter('cli.command.name', $this->getName());
$container->setParameter('paths.base', $basePath);
$container->set('cli.input', $input);
$container->set('cli.output', $output);
$extension = new ContainerLoader($this->extensionManager);
$extension->load($container, $this->loadConfiguration($input));
$container->addObjectResource($extension);
$container->compile();
return $container;
}