ModuleInstaller.php in Drupal 9

Namespace

Drupal\Core\Extension

File

core/lib/Drupal/Core/Extension/ModuleInstaller.php

<?php

namespace Drupal\Core\Extension;

use Drupal\Core\Cache\Cache;
use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Database\Connection;
use Drupal\Core\DrupalKernelInterface;
use Drupal\Core\Entity\EntityStorageException;
use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\Core\Extension\Exception\ObsoleteExtensionException;
use Drupal\Core\Installer\InstallerKernel;
use Drupal\Core\Serialization\Yaml;
use Drupal\Core\Update\UpdateHookRegistry;

/**
 * Default implementation of the module installer.
 *
 * It registers the module in config, installs its own configuration,
 * installs the schema, updates the Drupal kernel and more.
 *
 * We don't inject dependencies yet, as we would need to reload them after
 * each installation or uninstallation of a module.
 * https://www.drupal.org/project/drupal/issues/2350111 for example tries to
 * solve this dilemma.
 */
class ModuleInstaller implements ModuleInstallerInterface {

  /**
   * The module handler.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

  /**
   * The drupal kernel.
   *
   * @var \Drupal\Core\DrupalKernelInterface
   */
  protected $kernel;

  /**
   * The app root.
   *
   * @var string
   */
  protected $root;

  /**
   * The database connection.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected $connection;

  /**
   * The update registry service.
   *
   * @var \Drupal\Core\Update\UpdateHookRegistry
   */
  protected $updateRegistry;

  /**
   * The uninstall validators.
   *
   * @var \Drupal\Core\Extension\ModuleUninstallValidatorInterface[]
   */
  protected $uninstallValidators;

  /**
   * Constructs a new ModuleInstaller instance.
   *
   * @param string $root
   *   The app root.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   * @param \Drupal\Core\DrupalKernelInterface $kernel
   *   The drupal kernel.
   * @param \Drupal\Core\Database\Connection $connection
   *   The database connection.
   * @param \Drupal\Core\Update\UpdateHookRegistry|null $update_registry
   *   (Optional) The update registry service.
   *
   * @see \Drupal\Core\DrupalKernel
   * @see \Drupal\Core\CoreServiceProvider
   */
  public function __construct($root, ModuleHandlerInterface $module_handler, DrupalKernelInterface $kernel, Connection $connection = NULL, UpdateHookRegistry $update_registry = NULL) {
    $this->root = $root;
    $this->moduleHandler = $module_handler;
    $this->kernel = $kernel;
    if (!$connection) {
      @trigger_error('The database connection must be passed to ' . __METHOD__ . '(). Creating ' . __CLASS__ . ' without it is deprecated in drupal:9.2.0 and will be required in drupal:10.0.0. See https://www.drupal.org/node/2970993', E_USER_DEPRECATED);
      $connection = \Drupal::service('database');
    }
    $this->connection = $connection;
    if (!$update_registry) {
      @trigger_error('Calling ' . __METHOD__ . '() without the $update_registry argument is deprecated in drupal:9.3.0 and $update_registry argument will be required in drupal:10.0.0. See https://www.drupal.org/node/2124069', E_USER_DEPRECATED);
      $update_registry = \Drupal::service('update.update_hook_registry');
    }
    $this->updateRegistry = $update_registry;
  }

  /**
   * {@inheritdoc}
   */
  public function addUninstallValidator(ModuleUninstallValidatorInterface $uninstall_validator) {
    $this->uninstallValidators[] = $uninstall_validator;
  }

  /**
   * {@inheritdoc}
   */
  public function install(array $module_list, $enable_dependencies = TRUE) {
    $extension_config = \Drupal::configFactory()
      ->getEditable('core.extension');

    // Get all module data so we can find dependencies and sort and find the
    // core requirements. The module list needs to be reset so that it can
    // re-scan and include any new modules that may have been added directly
    // into the filesystem.
    $module_data = \Drupal::service('extension.list.module')
      ->reset()
      ->getList();
    foreach ($module_list as $module) {
      if (!empty($module_data[$module]->info['core_incompatible'])) {
        throw new MissingDependencyException("Unable to install modules: module '{$module}' is incompatible with this version of Drupal core.");
      }
      if ($module_data[$module]->info[ExtensionLifecycle::LIFECYCLE_IDENTIFIER] === ExtensionLifecycle::OBSOLETE) {
        throw new ObsoleteExtensionException("Unable to install modules: module '{$module}' is obsolete.");
      }
    }
    if ($enable_dependencies) {
      $module_list = $module_list ? array_combine($module_list, $module_list) : [];
      if ($missing_modules = array_diff_key($module_list, $module_data)) {

        // One or more of the given modules doesn't exist.
        throw new MissingDependencyException(sprintf('Unable to install modules %s due to missing modules %s.', implode(', ', $module_list), implode(', ', $missing_modules)));
      }

      // Only process currently uninstalled modules.
      $installed_modules = $extension_config
        ->get('module') ?: [];
      if (!($module_list = array_diff_key($module_list, $installed_modules))) {

        // Nothing to do. All modules already installed.
        return TRUE;
      }

      // Add dependencies to the list. The new modules will be processed as
      // the foreach loop continues.
      foreach ($module_list as $module => $value) {
        foreach (array_keys($module_data[$module]->requires) as $dependency) {
          if (!isset($module_data[$dependency])) {

            // The dependency does not exist.
            throw new MissingDependencyException("Unable to install modules: module '{$module}' is missing its dependency module {$dependency}.");
          }

          // Skip already installed modules.
          if (!isset($module_list[$dependency]) && !isset($installed_modules[$dependency])) {
            if ($module_data[$dependency]->info['core_incompatible']) {
              throw new MissingDependencyException("Unable to install modules: module '{$module}'. Its dependency module '{$dependency}' is incompatible with this version of Drupal core.");
            }
            $module_list[$dependency] = $dependency;
          }
        }
      }

      // Set the actual module weights.
      $module_list = array_map(function ($module) use ($module_data) {
        return $module_data[$module]->sort;
      }, $module_list);

      // Sort the module list by their weights (reverse).
      arsort($module_list);
      $module_list = array_keys($module_list);
    }

    // Required for module installation checks.
    include_once $this->root . '/core/includes/install.inc';

    /** @var \Drupal\Core\Config\ConfigInstaller $config_installer */
    $config_installer = \Drupal::service('config.installer');
    $sync_status = $config_installer
      ->isSyncing();
    if ($sync_status) {
      $source_storage = $config_installer
        ->getSourceStorage();
    }
    $modules_installed = [];
    foreach ($module_list as $module) {
      $enabled = $extension_config
        ->get("module.{$module}") !== NULL;
      if (!$enabled) {

        // Throw an exception if the module name is too long.
        if (strlen($module) > DRUPAL_EXTENSION_NAME_MAX_LENGTH) {
          throw new ExtensionNameLengthException("Module name '{$module}' is over the maximum allowed length of " . DRUPAL_EXTENSION_NAME_MAX_LENGTH . ' characters');
        }

        // Load a new config object for each iteration, otherwise changes made
        // in hook_install() are not reflected in $extension_config.
        $extension_config = \Drupal::configFactory()
          ->getEditable('core.extension');

        // Check the validity of the default configuration. This will throw
        // exceptions if the configuration is not valid.
        $config_installer
          ->checkConfigurationToInstall('module', $module);

        // Save this data without checking schema. This is a performance
        // improvement for module installation.
        $extension_config
          ->set("module.{$module}", 0)
          ->set('module', module_config_sort($extension_config
          ->get('module')))
          ->save(TRUE);

        // Prepare the new module list, sorted by weight, including filenames.
        // This list is used for both the ModuleHandler and DrupalKernel. It
        // needs to be kept in sync between both. A DrupalKernel reboot or
        // rebuild will automatically re-instantiate a new ModuleHandler that
        // uses the new module list of the kernel. However, DrupalKernel does
        // not cause any modules to be loaded.
        // Furthermore, the currently active (fixed) module list can be
        // different from the configured list of enabled modules. For all active
        // modules not contained in the configured enabled modules, we assume a
        // weight of 0.
        $current_module_filenames = $this->moduleHandler
          ->getModuleList();
        $current_modules = array_fill_keys(array_keys($current_module_filenames), 0);
        $current_modules = module_config_sort(array_merge($current_modules, $extension_config
          ->get('module')));
        $module_filenames = [];
        foreach ($current_modules as $name => $weight) {
          if (isset($current_module_filenames[$name])) {
            $module_filenames[$name] = $current_module_filenames[$name];
          }
          else {
            $module_path = \Drupal::service('extension.list.module')
              ->getPath($name);
            $pathname = "{$module_path}/{$name}.info.yml";
            $filename = file_exists($module_path . "/{$name}.module") ? "{$name}.module" : NULL;
            $module_filenames[$name] = new Extension($this->root, 'module', $pathname, $filename);
          }
        }

        // Update the module handler in order to have the correct module list
        // for the kernel update.
        $this->moduleHandler
          ->setModuleList($module_filenames);

        // Clear the static cache of the "extension.list.module" service to pick
        // up the new module, since it merges the installation status of modules
        // into its statically cached list.
        \Drupal::service('extension.list.module')
          ->reset();

        // Update the kernel to include it.
        $this
          ->updateKernel($module_filenames);

        // Load the module's .module and .install files.
        $this->moduleHandler
          ->load($module);
        module_load_install($module);
        if (!InstallerKernel::installationAttempted()) {

          // Replace the route provider service with a version that will rebuild
          // if routes used during installation. This ensures that a module's
          // routes are available during installation. This has to occur before
          // any services that depend on it are instantiated otherwise those
          // services will have the old route provider injected. Note that, since
          // the container is rebuilt by updating the kernel, the route provider
          // service is the regular one even though we are in a loop and might
          // have replaced it before.
          \Drupal::getContainer()
            ->set('router.route_provider.old', \Drupal::service('router.route_provider'));
          \Drupal::getContainer()
            ->set('router.route_provider', \Drupal::service('router.route_provider.lazy_builder'));
        }

        // Allow modules to react prior to the installation of a module.
        $this->moduleHandler
          ->invokeAll('module_preinstall', [
          $module,
        ]);

        // Now install the module's schema if necessary.
        $this
          ->installSchema($module);

        // Clear plugin manager caches.
        \Drupal::getContainer()
          ->get('plugin.cache_clearer')
          ->clearCachedDefinitions();

        // Set the schema version to the number of the last update provided by
        // the module, or the minimum core schema version.
        $version = \Drupal::CORE_MINIMUM_SCHEMA_VERSION;
        $versions = $this->updateRegistry
          ->getAvailableUpdates($module);
        if ($versions) {
          $version = max(max($versions), $version);
        }

        // Notify interested components that this module's entity types and
        // field storage definitions are new. For example, a SQL-based storage
        // handler can use this as an opportunity to create the necessary
        // database tables.
        // @todo Clean this up in https://www.drupal.org/node/2350111.
        $entity_type_manager = \Drupal::entityTypeManager();
        $update_manager = \Drupal::entityDefinitionUpdateManager();

        /** @var \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager */
        $entity_field_manager = \Drupal::service('entity_field.manager');
        foreach ($entity_type_manager
          ->getDefinitions() as $entity_type) {
          $is_fieldable_entity_type = $entity_type
            ->entityClassImplements(FieldableEntityInterface::class);
          if ($entity_type
            ->getProvider() == $module) {
            if ($is_fieldable_entity_type) {
              $update_manager
                ->installFieldableEntityType($entity_type, $entity_field_manager
                ->getFieldStorageDefinitions($entity_type
                ->id()));
            }
            else {
              $update_manager
                ->installEntityType($entity_type);
            }
          }
          elseif ($is_fieldable_entity_type) {

            // The module being installed may be adding new fields to existing
            // entity types. Field definitions for any entity type defined by
            // the module are handled in the if branch.
            foreach ($entity_field_manager
              ->getFieldStorageDefinitions($entity_type
              ->id()) as $storage_definition) {
              if ($storage_definition
                ->getProvider() == $module) {

                // If the module being installed is also defining a storage key
                // for the entity type, the entity schema may not exist yet. It
                // will be created later in that case.
                try {
                  $update_manager
                    ->installFieldStorageDefinition($storage_definition
                    ->getName(), $entity_type
                    ->id(), $module, $storage_definition);
                } catch (EntityStorageException $e) {
                  watchdog_exception('system', $e, 'An error occurred while notifying the creation of the @name field storage definition: "!message" in %function (line %line of %file).', [
                    '@name' => $storage_definition
                      ->getName(),
                  ]);
                }
              }
            }
          }
        }

        // Install default configuration of the module.
        $config_installer = \Drupal::service('config.installer');
        if ($sync_status) {
          $config_installer
            ->setSyncing(TRUE)
            ->setSourceStorage($source_storage);
        }
        \Drupal::service('config.installer')
          ->installDefaultConfig('module', $module);

        // If the module has no current updates, but has some that were
        // previously removed, set the version to the value of
        // hook_update_last_removed().
        if ($last_removed = $this->moduleHandler
          ->invoke($module, 'update_last_removed')) {
          $version = max($version, $last_removed);
        }
        $this->updateRegistry
          ->setInstalledVersion($module, $version);

        // Ensure that all post_update functions are registered already. This
        // should include existing post-updates, as well as any specified as
        // having been previously removed, to ensure that newly installed and
        // updated sites have the same entries in the registry.

        /** @var \Drupal\Core\Update\UpdateRegistry $post_update_registry */
        $post_update_registry = \Drupal::service('update.post_update_registry');
        $post_update_registry
          ->registerInvokedUpdates(array_merge($post_update_registry
          ->getModuleUpdateFunctions($module), array_keys($post_update_registry
          ->getRemovedPostUpdates($module))));

        // Record the fact that it was installed.
        $modules_installed[] = $module;

        // Drupal's stream wrappers needs to be re-registered in case a
        // module-provided stream wrapper is used later in the same request. In
        // particular, this happens when installing Drupal via Drush, as the
        // 'translations' stream wrapper is provided by Interface Translation
        // module and is later used to import translations.
        \Drupal::service('stream_wrapper_manager')
          ->register();

        // Update the theme registry to include it.
        drupal_theme_rebuild();

        // Modules can alter theme info, so refresh theme data.
        // @todo ThemeHandler cannot be injected into ModuleHandler, since that
        //   causes a circular service dependency.
        // @see https://www.drupal.org/node/2208429
        \Drupal::service('theme_handler')
          ->refreshInfo();

        // Allow the module to perform install tasks.
        $this->moduleHandler
          ->invoke($module, 'install', [
          $sync_status,
        ]);

        // Record the fact that it was installed.
        \Drupal::logger('system')
          ->info('%module module installed.', [
          '%module' => $module,
        ]);
      }
    }

    // If any modules were newly installed, invoke hook_modules_installed().
    if (!empty($modules_installed)) {
      if (!InstallerKernel::installationAttempted()) {

        // If the container was rebuilt during hook_install() it might not have
        // the 'router.route_provider.old' service.
        if (\Drupal::hasService('router.route_provider.old')) {
          \Drupal::getContainer()
            ->set('router.route_provider', \Drupal::service('router.route_provider.old'));
        }
        if (!\Drupal::service('router.route_provider.lazy_builder')
          ->hasRebuilt()) {

          // Rebuild routes after installing module. This is done here on top of
          // \Drupal\Core\Routing\RouteBuilder::destruct to not run into errors on
          // fastCGI which executes ::destruct() after the module installation
          // page was sent already.
          \Drupal::service('router.builder')
            ->rebuild();
        }
      }
      $this->moduleHandler
        ->invokeAll('modules_installed', [
        $modules_installed,
        $sync_status,
      ]);
    }
    return TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function uninstall(array $module_list, $uninstall_dependents = TRUE) {

    // Get all module data so we can find dependencies and sort.
    $module_data = \Drupal::service('extension.list.module')
      ->getList();
    $sync_status = \Drupal::service('config.installer')
      ->isSyncing();
    $module_list = $module_list ? array_combine($module_list, $module_list) : [];
    if (array_diff_key($module_list, $module_data)) {

      // One or more of the given modules doesn't exist.
      return FALSE;
    }
    $extension_config = \Drupal::configFactory()
      ->getEditable('core.extension');
    $installed_modules = $extension_config
      ->get('module') ?: [];
    if (!($module_list = array_intersect_key($module_list, $installed_modules))) {

      // Nothing to do. All modules already uninstalled.
      return TRUE;
    }
    if ($uninstall_dependents) {
      $theme_list = \Drupal::service('extension.list.theme')
        ->getList();

      // Add dependent modules to the list. The new modules will be processed as
      // the foreach loop continues.
      foreach ($module_list as $module => $value) {
        foreach (array_keys($module_data[$module]->required_by) as $dependent) {
          if (!isset($module_data[$dependent]) && !isset($theme_list[$dependent])) {

            // The dependent module or theme does not exist.
            return FALSE;
          }

          // Skip already uninstalled modules.
          if (isset($installed_modules[$dependent]) && !isset($module_list[$dependent])) {
            $module_list[$dependent] = $dependent;
          }
        }
      }
    }

    // Use the validators and throw an exception with the reasons.
    if ($reasons = $this
      ->validateUninstall($module_list)) {
      foreach ($reasons as $reason) {
        $reason_message[] = implode(', ', $reason);
      }
      throw new ModuleUninstallValidatorException('The following reasons prevent the modules from being uninstalled: ' . implode('; ', $reason_message));
    }

    // Set the actual module weights.
    $module_list = array_map(function ($module) use ($module_data) {
      return $module_data[$module]->sort;
    }, $module_list);

    // Sort the module list by their weights.
    asort($module_list);
    $module_list = array_keys($module_list);

    // Only process modules that are enabled. A module is only enabled if it is
    // configured as enabled. Custom or overridden module handlers might contain
    // the module already, which means that it might be loaded, but not
    // necessarily installed.
    foreach ($module_list as $module) {

      // Clean up all entity bundles (including fields) of every entity type
      // provided by the module that is being uninstalled.
      // @todo Clean this up in https://www.drupal.org/node/2350111.
      $entity_type_manager = \Drupal::entityTypeManager();
      $entity_type_bundle_info = \Drupal::service('entity_type.bundle.info');
      foreach ($entity_type_manager
        ->getDefinitions() as $entity_type_id => $entity_type) {
        if ($entity_type
          ->getProvider() == $module) {
          foreach (array_keys($entity_type_bundle_info
            ->getBundleInfo($entity_type_id)) as $bundle) {
            \Drupal::service('entity_bundle.listener')
              ->onBundleDelete($bundle, $entity_type_id);
          }
        }
      }

      // Allow modules to react prior to the uninstallation of a module.
      $this->moduleHandler
        ->invokeAll('module_preuninstall', [
        $module,
      ]);

      // Uninstall the module.
      module_load_install($module);
      $this->moduleHandler
        ->invoke($module, 'uninstall', [
        $sync_status,
      ]);

      // Remove all configuration belonging to the module.
      \Drupal::service('config.manager')
        ->uninstall('module', $module);

      // In order to make uninstalling transactional if anything uses routes.
      \Drupal::getContainer()
        ->set('router.route_provider.old', \Drupal::service('router.route_provider'));
      \Drupal::getContainer()
        ->set('router.route_provider', \Drupal::service('router.route_provider.lazy_builder'));

      // Notify interested components that this module's entity types are being
      // deleted. For example, a SQL-based storage handler can use this as an
      // opportunity to drop the corresponding database tables.
      // @todo Clean this up in https://www.drupal.org/node/2350111.
      $update_manager = \Drupal::entityDefinitionUpdateManager();

      /** @var \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager */
      $entity_field_manager = \Drupal::service('entity_field.manager');
      foreach ($entity_type_manager
        ->getDefinitions() as $entity_type) {
        if ($entity_type
          ->getProvider() == $module) {
          $update_manager
            ->uninstallEntityType($entity_type);
        }
        elseif ($entity_type
          ->entityClassImplements(FieldableEntityInterface::CLASS)) {

          // The module being uninstalled might have added new fields to
          // existing entity types. This will add them to the deleted fields
          // repository so their data will be purged on cron.
          foreach ($entity_field_manager
            ->getFieldStorageDefinitions($entity_type
            ->id()) as $storage_definition) {
            if ($storage_definition
              ->getProvider() == $module) {
              $update_manager
                ->uninstallFieldStorageDefinition($storage_definition);
            }
          }
        }
      }

      // Remove the schema.
      $this
        ->uninstallSchema($module);

      // Remove the module's entry from the config. Don't check schema when
      // uninstalling a module since we are only clearing a key.
      \Drupal::configFactory()
        ->getEditable('core.extension')
        ->clear("module.{$module}")
        ->save(TRUE);

      // Update the module handler to remove the module.
      // The current ModuleHandler instance is obsolete with the kernel rebuild
      // below.
      $module_filenames = $this->moduleHandler
        ->getModuleList();
      unset($module_filenames[$module]);
      $this->moduleHandler
        ->setModuleList($module_filenames);

      // Remove any potential cache bins provided by the module.
      $this
        ->removeCacheBins($module);

      // Clear the static cache of the "extension.list.module" service to pick
      // up the new module, since it merges the installation status of modules
      // into its statically cached list.
      \Drupal::service('extension.list.module')
        ->reset();

      // Update the kernel to exclude the uninstalled modules.
      $this
        ->updateKernel($module_filenames);

      // Clear plugin manager caches.
      \Drupal::getContainer()
        ->get('plugin.cache_clearer')
        ->clearCachedDefinitions();

      // Update the theme registry to remove the newly uninstalled module.
      drupal_theme_rebuild();

      // Modules can alter theme info, so refresh theme data.
      // @todo ThemeHandler cannot be injected into ModuleHandler, since that
      //   causes a circular service dependency.
      // @see https://www.drupal.org/node/2208429
      \Drupal::service('theme_handler')
        ->refreshInfo();
      \Drupal::logger('system')
        ->info('%module module uninstalled.', [
        '%module' => $module,
      ]);

      /** @var \Drupal\Core\Update\UpdateHookRegistry $update_registry */
      $update_registry = \Drupal::service('update.update_hook_registry');
      $update_registry
        ->deleteInstalledVersion($module);

      /** @var \Drupal\Core\Update\UpdateRegistry $post_update_registry */
      $post_update_registry = \Drupal::service('update.post_update_registry');
      $post_update_registry
        ->filterOutInvokedUpdatesByModule($module);
    }

    // Rebuild routes after installing module. This is done here on top of
    // \Drupal\Core\Routing\RouteBuilder::destruct to not run into errors on
    // fastCGI which executes ::destruct() after the Module uninstallation page
    // was sent already.
    \Drupal::service('router.builder')
      ->rebuild();

    // Let other modules react.
    $this->moduleHandler
      ->invokeAll('modules_uninstalled', [
      $module_list,
      $sync_status,
    ]);

    // Flush all persistent caches.
    // Any cache entry might implicitly depend on the uninstalled modules,
    // so clear all of them explicitly.
    $this->moduleHandler
      ->invokeAll('cache_flush');
    foreach (Cache::getBins() as $service_id => $cache_backend) {
      $cache_backend
        ->deleteAll();
    }
    return TRUE;
  }

  /**
   * Helper method for removing all cache bins registered by a given module.
   *
   * @param string $module
   *   The name of the module for which to remove all registered cache bins.
   */
  protected function removeCacheBins($module) {
    $service_yaml_file = \Drupal::service('extension.list.module')
      ->getPath($module) . "/{$module}.services.yml";
    if (!file_exists($service_yaml_file)) {
      return;
    }
    $definitions = Yaml::decode(file_get_contents($service_yaml_file));
    $cache_bin_services = array_filter(isset($definitions['services']) ? $definitions['services'] : [], function ($definition) {
      $tags = isset($definition['tags']) ? $definition['tags'] : [];
      foreach ($tags as $tag) {
        if (isset($tag['name']) && $tag['name'] == 'cache.bin') {
          return TRUE;
        }
      }
      return FALSE;
    });
    foreach (array_keys($cache_bin_services) as $service_id) {
      $backend = $this->kernel
        ->getContainer()
        ->get($service_id);
      if ($backend instanceof CacheBackendInterface) {
        $backend
          ->removeBin();
      }
    }
  }

  /**
   * Updates the kernel module list.
   *
   * @param string $module_filenames
   *   The list of installed modules.
   */
  protected function updateKernel($module_filenames) {

    // This reboots the kernel to register the module's bundle and its services
    // in the service container. The $module_filenames argument is taken over as
    // %container.modules% parameter, which is passed to a fresh ModuleHandler
    // instance upon first retrieval.
    $this->kernel
      ->updateModules($module_filenames, $module_filenames);

    // After rebuilding the container we need to update the injected
    // dependencies.
    $container = $this->kernel
      ->getContainer();
    $this->moduleHandler = $container
      ->get('module_handler');
    $this->connection = $container
      ->get('database');
    $this->updateRegistry = $container
      ->get('update.update_hook_registry');
  }

  /**
   * {@inheritdoc}
   */
  public function validateUninstall(array $module_list) {
    $reasons = [];
    foreach ($module_list as $module) {
      foreach ($this->uninstallValidators as $validator) {
        $validation_reasons = $validator
          ->validate($module);
        if (!empty($validation_reasons)) {
          if (!isset($reasons[$module])) {
            $reasons[$module] = [];
          }
          $reasons[$module] = array_merge($reasons[$module], $validation_reasons);
        }
      }
    }
    return $reasons;
  }

  /**
   * Creates all tables defined in a module's hook_schema().
   *
   * @param string $module
   *   The module for which the tables will be created.
   *
   * @internal
   */
  protected function installSchema(string $module) : void {
    $tables = $this->moduleHandler
      ->invoke($module, 'schema') ?? [];
    $schema = $this->connection
      ->schema();
    foreach ($tables as $name => $table) {
      $schema
        ->createTable($name, $table);
    }
  }

  /**
   * Removes all tables defined in a module's hook_schema().
   *
   * @param string $module
   *   The module for which the tables will be removed.
   *
   * @internal
   */
  protected function uninstallSchema(string $module) : void {
    $tables = $this->moduleHandler
      ->invoke($module, 'schema') ?? [];
    $schema = $this->connection
      ->schema();
    foreach (array_keys($tables) as $table) {
      if ($schema
        ->tableExists($table)) {
        $schema
          ->dropTable($table);
      }
    }
  }

}

Classes

Name	Description
ModuleInstaller	Default implementation of the module installer.