Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\config;
Chris@0: 
Chris@0: use Drupal\Core\Config\ConfigEvents;
Chris@0: use Drupal\Core\Config\ConfigImporterEvent;
Chris@0: use Drupal\Core\Config\ConfigImportValidateEventSubscriberBase;
Chris@0: 
Chris@0: /**
Chris@0:  * Config subscriber.
Chris@0:  */
Chris@0: class ConfigSubscriber extends ConfigImportValidateEventSubscriberBase {
Chris@0: 
Chris@0:   /**
Chris@0:    * Checks that the Configuration module is not being uninstalled.
Chris@0:    *
Chris@12:    * @param \Drupal\Core\Config\ConfigImporterEvent $event
Chris@0:    *   The config import event.
Chris@0:    */
Chris@0:   public function onConfigImporterValidate(ConfigImporterEvent $event) {
Chris@16:     // Make sure config syncs performed via the Config UI don't break, but
Chris@16:     // don't worry about syncs initiated via the command line.
Chris@16:     if (PHP_SAPI === 'cli') {
Chris@16:       return;
Chris@16:     }
Chris@0:     $importer = $event->getConfigImporter();
Chris@0:     $core_extension = $importer->getStorageComparer()->getSourceStorage()->read('core.extension');
Chris@0:     if (!isset($core_extension['module']['config'])) {
Chris@0:       $importer->logError($this->t('Can not uninstall the Configuration module as part of a configuration synchronization through the user interface.'));
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     $events[ConfigEvents::IMPORT_VALIDATE][] = ['onConfigImporterValidate', 20];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }