class ConfigOverride

class ConfigOverride implements ServiceProviderInterface, ConfigFactoryOverrideInterface {
  
  /**
   * {@inheritdoc}
   */
  public function register(ContainerBuilder $container) {
    // Register this class so that it can override configuration.
    $container->register('core.install_config_override', static::class)
      ->addTag('config.factory.override');
  }
  
  /**
   * {@inheritdoc}
   */
  public function loadOverrides($names) {
    $overrides = [];
    if (InstallerKernel::installationAttempted() && function_exists('drupal_install_profile_distribution_name')) {
      // Early in the installer the site name is unknown. In this case we need
      // to fallback to the distribution's name.
      $overrides['system.site'] = [
        'name' => drupal_install_profile_distribution_name(),
      ];
    }
    return $overrides;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCacheSuffix() {
    return 'core.install_config_override';
  }
  
  /**
   * {@inheritdoc}
   */
  public function createConfigObject($name, $collection = StorageInterface::DEFAULT_COLLECTION) {
    return NULL;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCacheableMetadata($name) {
    return new CacheableMetadata();
  }

}