--- /dev/null
+<?php
+
+namespace Drupal\Core\Entity\Event;
+
+use Drupal\Core\Config\ConfigImporterEvent;
+use Drupal\Core\Config\ConfigImportValidateEventSubscriberBase;
+use Drupal\Core\Config\ConfigManagerInterface;
+use Drupal\Core\Config\Entity\ConfigEntityStorage;
+use Drupal\Core\Entity\EntityManagerInterface;
+
+/**
+ * Entity config importer validation event subscriber.
+ */
+class BundleConfigImportValidate extends ConfigImportValidateEventSubscriberBase {
+
+ /**
+ * The config manager.
+ *
+ * @var \Drupal\Core\Config\ConfigManagerInterface
+ */
+ protected $configManager;
+
+ /**
+ * The entity manager.
+ *
+ * @var \Drupal\Core\Entity\EntityManagerInterface
+ */
+ protected $entityManager;
+
+ /**
+ * Constructs the event subscriber.
+ *
+ * @param \Drupal\Core\Config\ConfigManagerInterface $config_manager
+ * The config manager
+ * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+ * The entity manager.
+ */
+ public function __construct(ConfigManagerInterface $config_manager, EntityManagerInterface $entity_manager) {
+ $this->configManager = $config_manager;
+ $this->entityManager = $entity_manager;
+ }
+
+ /**
+ * Ensures bundles that will be deleted are not in use.
+ *
+ * @param \Drupal\Core\Config\ConfigImporterEvent $event
+ * The config import event.
+ */
+ public function onConfigImporterValidate(ConfigImporterEvent $event) {
+ foreach ($event->getChangelist('delete') as $config_name) {
+ // Get the config entity type ID. This also ensure we are dealing with a
+ // configuration entity.
+ if ($entity_type_id = $this->configManager->getEntityTypeIdByName($config_name)) {
+ $entity_type = $this->entityManager->getDefinition($entity_type_id);
+ // Does this entity type define a bundle of another entity type.
+ if ($bundle_of = $entity_type->getBundleOf()) {
+ // Work out if there are entities with this bundle.
+ $bundle_of_entity_type = $this->entityManager->getDefinition($bundle_of);
+ $bundle_id = ConfigEntityStorage::getIDFromConfigName($config_name, $entity_type->getConfigPrefix());
+ $entity_query = $this->entityManager->getStorage($bundle_of)->getQuery();
+ $entity_ids = $entity_query->condition($bundle_of_entity_type->getKey('bundle'), $bundle_id)
+ ->accessCheck(FALSE)
+ ->range(0, 1)
+ ->execute();
+ if (!empty($entity_ids)) {
+ $entity = $this->entityManager->getStorage($entity_type_id)->load($bundle_id);
+ $event->getConfigImporter()->logError($this->t('Entities exist of type %entity_type and %bundle_label %bundle. These entities need to be deleted before importing.', ['%entity_type' => $bundle_of_entity_type->getLabel(), '%bundle_label' => $bundle_of_entity_type->getBundleLabel(), '%bundle' => $entity->label()]));
+ }
+ }
+ }
+ }
+ }
+
+}