public static function UpdateKernel::fixSerializedExtensionObjects in Drupal 8

Fixes caches and theme info if they contain old Extension objects.

@internal This function is only to be called by the Drupal core update process. Additionally, this function will be removed in minor release of Drupal.

@todo https://www.drupal.org/project/drupal/issues/3031322 Remove once Drupal 8.6.x is not supported.

Parameters

\Symfony\Component\DependencyInjection\ContainerInterface $container: The container.

2 calls to UpdateKernel::fixSerializedExtensionObjects()

UpdateKernel::loadLegacyIncludes in core/lib/Drupal/Core/Update/UpdateKernel.php

Helper method that loads legacy Drupal include files.

update_fix_compatibility in core/includes/update.inc

Disables any extensions that are incompatible with the current core version.

File

core/lib/Drupal/Core/Update/UpdateKernel.php, line 215

Class

UpdateKernel

Defines a kernel which is used primarily to run the update of Drupal.

Namespace

Drupal\Core\Update

Code

public static function fixSerializedExtensionObjects(ContainerInterface $container) {

  // Create a custom error handler that will clear caches if a warning occurs
  // while getting 'system.theme.data' from state. If this state value was
  // created by Drupal <= 8.6.7 then when it is read by Drupal >= 8.6.8 there
  // will be PHP warnings. This silently fixes Drupal so that the update can
  // continue.
  $clear_caches = FALSE;
  $callable = function ($errno, $errstr) use ($container, &$clear_caches) {
    if ($errstr === 'Class Drupal\\Core\\Extension\\Extension has no unserializer') {
      $clear_caches = TRUE;
    }
  };
  set_error_handler($callable, E_ERROR | E_WARNING);
  $container
    ->get('state')
    ->get('system.theme.data', []);
  restore_error_handler();
  if ($clear_caches) {

    // Reset static caches in profile list so the module list is rebuilt
    // correctly.
    $container
      ->get('extension.list.profile')
      ->reset();
    foreach ($container
      ->getParameter('cache_bins') as $service_id => $bin) {
      $container
        ->get($service_id)
        ->deleteAll();
    }

    // The system.theme.data key is no longer used in Drupal 8.7.x.
    $container
      ->get('state')
      ->delete('system.theme.data');

    // Also rebuild themes because it uses state as cache.
    $container
      ->get('theme_handler')
      ->refreshInfo();
  }
}