Issue #2776357 by alexpott: Upgrade path for Config translation synchronization failure

core/modules/system/src/Tests/Update/ConfigOverridesUpdateTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Drupal\system\Tests\Update;
+
+/**
+ * Tests system_update_8200().
+ *
+ * @see system_update_8200()
+ *
+ * @group Update
+ */
+class ConfigOverridesUpdateTest extends UpdatePathTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setDatabaseDumpFiles() {
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../tests/fixtures/update/drupal-8.filled.standard.php.gz',
+      __DIR__ . '/../../../tests/fixtures/update/drupal-8.config-override-fix.php',
+    ];
+  }
+
+  /**
+   * Tests that configuration has been updated.
+   */
+  public function testUpdatedSite() {
+    $key_to_be_removed = 'display.default.display_options.fields.nid';
+    /** @var \Drupal\Core\Config\Config $config_override */
+    $language_config_override = \Drupal::service('language.config_factory_override');
+    $config_override = $language_config_override->getOverride('es', 'views.view.content');
+    $this->assertEqual('Spanish ID', $config_override->get($key_to_be_removed)['label'], 'The spanish override for the missing field exists before updating.');
+    // Since the above view will be fixed by other updates that fix views
+    // configuration for example,
+    // views_post_update_update_cacheability_metadata(), also test configuration
+    // that has yet to be modified in an update path.
+    $config_override = $language_config_override->getOverride('es', 'system.cron');
+    $this->assertEqual('Should be cleaned by system_update_8200', $config_override->get('bogus_key'), 'The spanish override in system.cron exists before updating.');
+
+    $this->runUpdates();
+
+    /** @var \Drupal\Core\Config\Config $config_override */
+    $config_override = \Drupal::service('language.config_factory_override')->getOverride('es', 'views.view.content');
+    $this->assertNull($config_override->get($key_to_be_removed), 'The spanish override for the missing field has been removed.');
+    $config_override = $language_config_override->getOverride('es', 'system.cron');
+    $this->assertTrue($config_override->isNew(), 'After updating the system.cron spanish override does not exist.');
+    $this->assertTrue(empty($config_override->get()), 'After updating the system.cron spanish override has no data.');
+
+    // Test that the spanish overrides still work.
+    $this->drupalLogin($this->createUser(['access content overview']));
+    $this->drupalGet('admin/content', ['language' => \Drupal::languageManager()->getLanguage('es')]);
+    $this->assertText('Spanish Title');
+    $this->assertText('Spanish Author');
+  }
+
+}

core/modules/system/system.install

@@ -1657,3 +1657,26 @@ function system_update_8014() {
 /**
  * @} End of "addtogroup updates-8.0.0-rc".
  */
+
+/**
+ * Fix configuration overrides to not override non existing keys.
+ */
+function system_update_8200(&$sandbox) {
+  $config_factory = \Drupal::configFactory();
+  if (!array_key_exists('config_names', $sandbox)) {
+    $sandbox['config_names'] = $config_factory->listAll();
+    $sandbox['max'] = count($sandbox['config_names']);
+  }
+
+  // Get a list of 50 to work on at a time.
+  $config_names_to_process = array_slice($sandbox['config_names'], 0, 50);
+  // Preload in a single query.
+  $config_factory->loadMultiple($config_names_to_process);
+  foreach ($config_names_to_process as $config_name) {
+    $config_factory->getEditable($config_name)->save();
+  }
+
+  // Update the list of names to process.
+  $sandbox['config_names'] = array_diff($sandbox['config_names'], $config_names_to_process);
+  $sandbox['#finished'] = empty($sandbox['config_names']) ? 1 : ($sandbox['max'] - count($sandbox['config_names'])) / $sandbox['max'];
+}

core/modules/system/tests/fixtures/update/drupal-8.config-override-fix.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * @file
+ * Partial database to create broken config overrides.
+ *
+ * @see \Drupal\system\Tests\Update\ConfigOverridesUpdateTest
+ */
+
+use Drupal\Core\Database\Database;
+use Symfony\Component\Yaml\Yaml;
+
+$connection = Database::getConnection();
+
+// Install the incorrect override configuration.
+$configs = [
+  // The view has field titles translated and had an addition field added,
+  // translated and then removed.
+  'views.view.content',
+  // The configuration has a bogus key.
+  'system.cron',
+];
+foreach ($configs as $config_name) {
+  $config = Yaml::parse(file_get_contents(__DIR__ . '/es-' . $config_name . '.yml'));
+  $connection->delete('config')
+    ->condition('name', $config_name)
+    ->condition('collection', 'language.es')
+    ->execute();
+  $connection->insert('config')
+    ->fields(['data', 'name', 'collection'])
+    ->values([
+      'name' => $config_name,
+      'data' => serialize($config),
+      'collection' => 'language.es',
+    ])
+    ->execute();
+}

core/modules/system/tests/fixtures/update/es-system.cron.yml

@@ -0,0 +1 @@
+bogus_key: 'Should be cleaned by system_update_8200'

core/modules/system/tests/fixtures/update/es-views.view.content.yml

@@ -0,0 +1,15 @@
+label: 'Spanish Content'
+description: 'Spanish Find and manage content.'
+display:
+  default:
+    display_options:
+      fields:
+        title:
+          label: 'Spanish Title'
+        name:
+          label: 'Spanish Author'
+        nid:
+          label: 'Spanish ID'
+    display_title: 'Spanish Master'
+  page_1:
+    display_title: 'Spanish Page'