Drupal Console ConfigExportCommand class

ConfigExportCommand.php

<?php
/**
 * @file
 * Contains \Drupal\AppConsole\Command\ConfigExportCommand.
 */

namespace Drupal\AppConsole\Command;

use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Drupal\Core\Config\FileStorage;

class ConfigExportCommand extends ContainerAwareCommand
{
    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
          ->setName('config:export')
          ->setDescription($this->trans('commands.config.export.description'))
          ->addArgument('directory', InputArgument::OPTIONAL,
            $this->trans('commands.config.export.arguments.directory'));
    }

    /**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $directory = $input->getArgument('directory');

        if (!$directory) {
            $config = $this->getConfigFactory()->get('system.file');
            $directory = $config->get('path.temporary') ?:'/tmp';
        }
        $directory .= '/' . CONFIG_STAGING_DIRECTORY;

        $source_storage = $this->getConfigStorage();
        $destination_storage = new FileStorage($directory);
        foreach ($source_storage->listAll() as $name) {
            $destination_storage->write($name, $source_storage->read($name));
        }

        $collectionNames = $this->getConfigStorage()->getAllCollectionNames();
        foreach ($collectionNames as $collection) {
            $source_storage = $source_storage->createCollection($collection);
            $destination_storage = $destination_storage->createCollection($collection);
            foreach ($source_storage->listAll() as $name) {
                $destination_storage->write($name, $source_storage->read($name));
            }
        }

        $this->showMessage($output, 'commands.config.export.messages.directory : ' . $directory);
    }
}