Issue #2268939 by Gábor Hojtsy, vijaycs85: Fixed Config overrides not updated when config changes.

core/lib/Drupal/Core/Config/ConfigFactoryOverrideBase.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Config\ConfigFactoryOverrideBase.
+ */
+
+namespace Drupal\Core\Config;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Defines a base event listener implementation configuration overrides.
+ */
+abstract class ConfigFactoryOverrideBase implements EventSubscriberInterface {
+
+  /**
+   * Reacts to the ConfigEvents::COLLECTION_INFO event.
+   *
+   * @param \Drupal\Core\Config\ConfigCollectionInfo $collection_info
+   *   The configuration collection names event.
+   */
+  abstract public function addCollections(ConfigCollectionInfo $collection_info);
+
+  /**
+   * Actions to be performed to configuration override on configuration save.
+   *
+   * @param \Drupal\Core\Config\ConfigCrudEvent $event
+   *   The config CRUD event.
+   */
+  abstract public function onConfigSave(ConfigCrudEvent $event);
+
+  /**
+   * Actions to be performed to configuration override on configuration delete.
+   *
+   * @param \Drupal\Core\Config\ConfigCrudEvent $event
+   *   The config CRUD event.
+   */
+  abstract public function onConfigDelete(ConfigCrudEvent $event);
+
+  /**
+   * Actions to be performed to configuration override on configuration rename.
+   *
+   * @param \Drupal\Core\Config\ConfigRenameEvent $event
+   *   The config rename event.
+   */
+  abstract public function onConfigRename(ConfigRenameEvent $event);
+
+  /**
+   * {@inheritdoc}
+   */
+  static function getSubscribedEvents() {
+    $events[ConfigEvents::COLLECTION_INFO][] = array('addCollections');
+    $events[ConfigEvents::SAVE][] = array('onConfigSave', 20);
+    $events[ConfigEvents::DELETE][] = array('onConfigDelete', 20);
+    $events[ConfigEvents::RENAME][] = array('onConfigRename', 20);
+    return $events;
+  }
+
+  /**
+   * Filters data in the override based on what is currently in configuration.
+   *
+   * @param \Drupal\Core\Config\Config $config
+   *   Current configuration object.
+   * @param \Drupal\Core\Config\StorableConfigBase $override
+   *   Override object corresponding to the configuration to filter data in.
+   */
+  protected function filterOverride(Config $config, StorableConfigBase $override) {
+    $override_data = $override->get();
+    $this->filterNestedArray($config->get(), $override_data);
+    if (empty($override_data)) {
+      // If no override values are left that would apply, remove the override.
+      $override->delete();
+    }
+    else {
+      // Otherwise set the filtered override values back.
+      $override->setData($override_data)->save();
+    }
+  }
+
+  /**
+   * Filters data in nested arrays.
+   *
+   * @param array $original_data
+   *   Original data array to filter against.
+   * @param array $override_data
+   *   Override data to filter.
+   */
+  protected function filterNestedArray(array $original_data, array &$override_data) {
+    foreach ($override_data as $key => $value) {
+      if (!isset($original_data[$key])) {
+        // The original data is not there anymore, remove the override.
+        unset($override_data[$key]);
+      }
+      elseif (is_array($override_data[$key])) {
+        if (is_array($original_data[$key])) {
+          // Do the filtering one level deeper.
+          $this->filterNestedArray($original_data[$key], $override_data[$key]);
+          // If no overrides are left under this level, remove the level.
+          if (empty($override_data[$key])) {
+            unset($override_data[$key]);
+          }
+        }
+        else {
+          // The override is an array but the value is not, this will not go
+          // well, remove the override.
+          unset($override_data[$key]);
+        }
+      }
+    }
+  }
+
+}

core/modules/config/src/Tests/ConfigLanguageOverrideTest.php

@@ -76,6 +76,56 @@ function testConfigLanguageOverride() {
     $config = \Drupal::config('config_test.new');
     $this->assertIdentical($config->get('language'), NULL);
     \Drupal::configFactory()->setOverrideState($old_state);
+
+    // Test how overrides react to base configuration changes. Set up some base
+    // values.
+    \Drupal::config('config_test.foo')
+      ->set('value', array('key' => 'original'))
+      ->set('label', 'Original')
+      ->save();
+    \Drupal::languageManager()
+      ->getLanguageConfigOverride('de', 'config_test.foo')
+      ->set('value', array('key' => 'override'))
+      ->set('label', 'Override')
+      ->save();
+    \Drupal::languageManager()
+      ->getLanguageConfigOverride('fr', 'config_test.foo')
+      ->set('value', array('key' => 'override'))
+      ->save();
+    \Drupal::configFactory()->clearStaticCache();
+    $config = \Drupal::config('config_test.foo');
+    $this->assertIdentical($config->get('value'), array('key' => 'override'));
+
+    // Ensure renaming the config will rename the override.
+    \Drupal::configFactory()->rename('config_test.foo', 'config_test.bar');
+    $config = \Drupal::config('config_test.bar');
+    $this->assertEqual($config->get('value'), array('key' => 'original'));
+    $override = \Drupal::languageManager()->getLanguageConfigOverride('de', 'config_test.foo');
+    $this->assertTrue($override->isNew());
+    $this->assertEqual($override->get('value'), NULL);
+    $override = \Drupal::languageManager()->getLanguageConfigOverride('de', 'config_test.bar');
+    $this->assertFalse($override->isNew());
+    $this->assertEqual($override->get('value'), array('key' => 'override'));
+    $override = \Drupal::languageManager()->getLanguageConfigOverride('fr', 'config_test.bar');
+    $this->assertFalse($override->isNew());
+    $this->assertEqual($override->get('value'), array('key' => 'override'));
+
+    // Ensure changing data in the config will update the overrides.
+    $config = \Drupal::config('config_test.bar')->clear('value.key')->save();
+    $this->assertEqual($config->get('value'), array());
+    $override = \Drupal::languageManager()->getLanguageConfigOverride('de', 'config_test.bar');
+    $this->assertFalse($override->isNew());
+    $this->assertEqual($override->get('value'), NULL);
+    // The French override will become empty and therefore removed.
+    $override = \Drupal::languageManager()->getLanguageConfigOverride('fr', 'config_test.bar');
+    $this->assertTrue($override->isNew());
+    $this->assertEqual($override->get('value'), NULL);
+
+    // Ensure deleting the config will delete the override.
+    \Drupal::configFactory()->get('config_test.bar')->delete();
+    $override = \Drupal::languageManager()->getLanguageConfigOverride('de', 'config_test.bar');
+    $this->assertTrue($override->isNew());
+    $this->assertEqual($override->get('value'), NULL);
   }
 }
 

core/modules/language/src/Config/LanguageConfigFactoryOverride.php

@@ -9,7 +9,9 @@
 
 use Drupal\Component\Utility\String;
 use Drupal\Core\Config\ConfigCollectionInfo;
-use Drupal\Core\Config\ConfigEvents;
+use Drupal\Core\Config\ConfigCrudEvent;
+use Drupal\Core\Config\ConfigFactoryOverrideBase;
+use Drupal\Core\Config\ConfigRenameEvent;
 use Drupal\Core\Config\StorageInterface;
 use Drupal\Core\Config\TypedConfigManagerInterface;
 use Drupal\Core\Language\LanguageDefault;
@@ -20,7 +22,7 @@
 /**
  * Provides language overrides for the configuration factory.
  */
-class LanguageConfigFactoryOverride implements LanguageConfigFactoryOverrideInterface, EventSubscriberInterface {
+class LanguageConfigFactoryOverride extends ConfigFactoryOverrideBase implements LanguageConfigFactoryOverrideInterface, EventSubscriberInterface {
 
   /**
    * The configuration storage.
@@ -194,10 +196,7 @@ protected function getLangcodeFromCollectionName($collection) {
   }
 
   /**
-   * Reacts to the ConfigEvents::COLLECTION_INFO event.
-   *
-   * @param \Drupal\Core\Config\ConfigCollectionInfo $collection_info
-   *   The configuration collection names event.
+   * {@inheritdoc}
    */
   public function addCollections(ConfigCollectionInfo $collection_info) {
     foreach (\Drupal::languageManager()->getLanguages() as $language) {
@@ -208,9 +207,47 @@ public function addCollections(ConfigCollectionInfo $collection_info) {
   /**
    * {@inheritdoc}
    */
-  static function getSubscribedEvents() {
-    $events[ConfigEvents::COLLECTION_INFO][] = array('addCollections');
-    return $events;
+  public function onConfigSave(ConfigCrudEvent $event) {
+    $config = $event->getConfig();
+    $name = $config->getName();
+    foreach (\Drupal::languageManager()->getLanguages() as $language) {
+      $config_translation = $this->getOverride($language->getId(), $name);
+      if (!$config_translation->isNew()) {
+        $this->filterOverride($config, $config_translation);
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onConfigRename(ConfigRenameEvent $event) {
+    $config = $event->getConfig();
+    $name = $config->getName();
+    $old_name = $event->getOldName();
+    foreach (\Drupal::languageManager()->getLanguages() as $language) {
+      $config_translation = $this->getOverride($language->getId(), $old_name);
+      if (!$config_translation->isNew()) {
+        $saved_config = $config_translation->get();
+        $storage = $this->getStorage($language->getId());
+        $storage->write($name, $saved_config);
+        $config_translation->delete();
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onConfigDelete(ConfigCrudEvent $event) {
+    $config = $event->getConfig();
+    $name = $config->getName();
+    foreach (\Drupal::languageManager()->getLanguages() as $language) {
+      $config_translation = $this->getOverride($language->getId(), $name);
+      if (!$config_translation->isNew()) {
+        $config_translation->delete();
+      }
+    }
   }
 
 }