diff core/includes/update.inc @ 0:c75dbcec494b

Initial commit from drush-created site
author Chris Cannam
date Thu, 05 Jul 2018 14:24:15 +0000
parents
children a9cd425dd02b
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/includes/update.inc	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,688 @@
+<?php
+
+/**
+ * @file
+ * Drupal database update API.
+ *
+ * This file contains functions to perform database updates for a Drupal
+ * installation. It is included and used extensively by update.php.
+ */
+
+use Drupal\Component\Graph\Graph;
+use Drupal\Core\Utility\Error;
+
+/**
+ * Disables any extensions that are incompatible with the current core version.
+ */
+function update_fix_compatibility() {
+  $extension_config = \Drupal::configFactory()->getEditable('core.extension');
+  $save = FALSE;
+  foreach (['module', 'theme'] as $type) {
+    foreach ($extension_config->get($type) as $name => $weight) {
+      if (update_check_incompatibility($name, $type)) {
+        $extension_config->clear("$type.$name");
+        $save = TRUE;
+      }
+    }
+  }
+  if ($save) {
+    $extension_config->set('module', module_config_sort($extension_config->get('module')));
+    $extension_config->save();
+  }
+}
+
+/**
+ * Tests the compatibility of a module or theme.
+ */
+function update_check_incompatibility($name, $type = 'module') {
+  static $themes, $modules;
+
+  // Store values of expensive functions for future use.
+  if (empty($themes) || empty($modules)) {
+    // We need to do a full rebuild here to make sure the database reflects any
+    // code changes that were made in the filesystem before the update script
+    // was initiated.
+    $themes = \Drupal::service('theme_handler')->rebuildThemeData();
+    $modules = system_rebuild_module_data();
+  }
+
+  if ($type == 'module' && isset($modules[$name])) {
+    $file = $modules[$name];
+  }
+  elseif ($type == 'theme' && isset($themes[$name])) {
+    $file = $themes[$name];
+  }
+  if (!isset($file)
+      || !isset($file->info['core'])
+      || $file->info['core'] != \Drupal::CORE_COMPATIBILITY
+      || version_compare(phpversion(), $file->info['php']) < 0) {
+    return TRUE;
+  }
+  return FALSE;
+}
+
+/**
+ * Returns whether the minimum schema requirement has been satisfied.
+ *
+ * @return array
+ *   A requirements info array.
+ */
+function update_system_schema_requirements() {
+  $requirements = [];
+
+  $system_schema = drupal_get_installed_schema_version('system');
+
+  $requirements['minimum schema']['title'] = 'Minimum schema version';
+  if ($system_schema >= \Drupal::CORE_MINIMUM_SCHEMA_VERSION) {
+    $requirements['minimum schema'] += [
+      'value' => 'The installed schema version meets the minimum.',
+      'description' => 'Schema version: ' . $system_schema,
+    ];
+  }
+  else {
+    $requirements['minimum schema'] += [
+      'value' => 'The installed schema version does not meet the minimum.',
+      'severity' => REQUIREMENT_ERROR,
+      'description' => 'Your system schema version is ' . $system_schema . '. Updating directly from a schema version prior to 8000 is not supported. You must upgrade your site to Drupal 8 first, see https://www.drupal.org/docs/8/upgrade.',
+    ];
+  }
+
+  return $requirements;
+}
+
+/**
+ * Checks update requirements and reports errors and (optionally) warnings.
+ */
+function update_check_requirements() {
+  // Check requirements of all loaded modules.
+  $requirements = \Drupal::moduleHandler()->invokeAll('requirements', ['update']);
+  $requirements += update_system_schema_requirements();
+  return $requirements;
+}
+
+/**
+ * Forces a module to a given schema version.
+ *
+ * This function is rarely necessary.
+ *
+ * @param string $module
+ *   Name of the module.
+ * @param string $schema_version
+ *   The schema version the module should be set to.
+ */
+function update_set_schema($module, $schema_version) {
+  \Drupal::keyValue('system.schema')->set($module, $schema_version);
+  // system_list_reset() is in module.inc but that would only be available
+  // once the variable bootstrap is done.
+  require_once __DIR__ . '/module.inc';
+  system_list_reset();
+}
+
+/**
+ * Implements callback_batch_operation().
+ *
+ * Performs one update and stores the results for display on the results page.
+ *
+ * If an update function completes successfully, it should return a message
+ * as a string indicating success, for example:
+ * @code
+ * return t('New index added successfully.');
+ * @endcode
+ *
+ * Alternatively, it may return nothing. In that case, no message
+ * will be displayed at all.
+ *
+ * If it fails for whatever reason, it should throw an instance of
+ * Drupal\Core\Utility\UpdateException with an appropriate error message, for
+ * example:
+ * @code
+ * use Drupal\Core\Utility\UpdateException;
+ * throw new UpdateException(t('Description of what went wrong'));
+ * @endcode
+ *
+ * If an exception is thrown, the current update and all updates that depend on
+ * it will be aborted. The schema version will not be updated in this case, and
+ * all the aborted updates will continue to appear on update.php as updates
+ * that have not yet been run.
+ *
+ * If an update function needs to be re-run as part of a batch process, it
+ * should accept the $sandbox array by reference as its first parameter
+ * and set the #finished property to the percentage completed that it is, as a
+ * fraction of 1.
+ *
+ * @param $module
+ *   The module whose update will be run.
+ * @param $number
+ *   The update number to run.
+ * @param $dependency_map
+ *   An array whose keys are the names of all update functions that will be
+ *   performed during this batch process, and whose values are arrays of other
+ *   update functions that each one depends on.
+ * @param $context
+ *   The batch context array.
+ *
+ * @see update_resolve_dependencies()
+ */
+function update_do_one($module, $number, $dependency_map, &$context) {
+  $function = $module . '_update_' . $number;
+
+  // If this update was aborted in a previous step, or has a dependency that
+  // was aborted in a previous step, go no further.
+  if (!empty($context['results']['#abort']) && array_intersect($context['results']['#abort'], array_merge($dependency_map, [$function]))) {
+    return;
+  }
+
+  $ret = [];
+  if (function_exists($function)) {
+    try {
+      $ret['results']['query'] = $function($context['sandbox']);
+      $ret['results']['success'] = TRUE;
+    }
+    // @TODO We may want to do different error handling for different
+    // exception types, but for now we'll just log the exception and
+    // return the message for printing.
+    // @see https://www.drupal.org/node/2564311
+    catch (Exception $e) {
+      watchdog_exception('update', $e);
+
+      $variables = Error::decodeException($e);
+      unset($variables['backtrace']);
+      $ret['#abort'] = ['success' => FALSE, 'query' => t('%type: @message in %function (line %line of %file).', $variables)];
+    }
+  }
+
+  if (isset($context['sandbox']['#finished'])) {
+    $context['finished'] = $context['sandbox']['#finished'];
+    unset($context['sandbox']['#finished']);
+  }
+
+  if (!isset($context['results'][$module])) {
+    $context['results'][$module] = [];
+  }
+  if (!isset($context['results'][$module][$number])) {
+    $context['results'][$module][$number] = [];
+  }
+  $context['results'][$module][$number] = array_merge($context['results'][$module][$number], $ret);
+
+  if (!empty($ret['#abort'])) {
+    // Record this function in the list of updates that were aborted.
+    $context['results']['#abort'][] = $function;
+  }
+
+  // Record the schema update if it was completed successfully.
+  if ($context['finished'] == 1 && empty($ret['#abort'])) {
+    drupal_set_installed_schema_version($module, $number);
+  }
+
+  $context['message'] = t('Updating @module', ['@module' => $module]);
+}
+
+/**
+ * Executes a single hook_post_update_NAME().
+ *
+ * @param string $function
+ *   The function name, that should be executed.
+ * @param array $context
+ *   The batch context array.
+ */
+function update_invoke_post_update($function, &$context) {
+  $ret = [];
+
+  // If this update was aborted in a previous step, or has a dependency that was
+  // aborted in a previous step, go no further.
+  if (!empty($context['results']['#abort'])) {
+    return;
+  }
+
+  list($module, $name) = explode('_post_update_', $function, 2);
+  module_load_include('php', $module, $module . '.post_update');
+  if (function_exists($function)) {
+    try {
+      $ret['results']['query'] = $function($context['sandbox']);
+      $ret['results']['success'] = TRUE;
+
+      if (!isset($context['sandbox']['#finished']) || (isset($context['sandbox']['#finished']) && $context['sandbox']['#finished'] >= 1)) {
+        \Drupal::service('update.post_update_registry')->registerInvokedUpdates([$function]);
+      }
+    }
+    // @TODO We may want to do different error handling for different exception
+    // types, but for now we'll just log the exception and return the message
+    // for printing.
+    // @see https://www.drupal.org/node/2564311
+    catch (Exception $e) {
+      watchdog_exception('update', $e);
+
+      $variables = Error::decodeException($e);
+      unset($variables['backtrace']);
+      $ret['#abort'] = [
+        'success' => FALSE,
+        'query' => t('%type: @message in %function (line %line of %file).', $variables),
+      ];
+    }
+  }
+
+  if (isset($context['sandbox']['#finished'])) {
+    $context['finished'] = $context['sandbox']['#finished'];
+    unset($context['sandbox']['#finished']);
+  }
+  if (!isset($context['results'][$module][$name])) {
+    $context['results'][$module][$name] = [];
+  }
+  $context['results'][$module][$name] = array_merge($context['results'][$module][$name], $ret);
+
+  if (!empty($ret['#abort'])) {
+    // Record this function in the list of updates that were aborted.
+    $context['results']['#abort'][] = $function;
+  }
+
+  $context['message'] = t('Post updating @module', ['@module' => $module]);
+}
+
+/**
+ * Returns a list of all the pending database updates.
+ *
+ * @return
+ *   An associative array keyed by module name which contains all information
+ *   about database updates that need to be run, and any updates that are not
+ *   going to proceed due to missing requirements. The system module will
+ *   always be listed first.
+ *
+ *   The subarray for each module can contain the following keys:
+ *   - start: The starting update that is to be processed. If this does not
+ *       exist then do not process any updates for this module as there are
+ *       other requirements that need to be resolved.
+ *   - warning: Any warnings about why this module can not be updated.
+ *   - pending: An array of all the pending updates for the module including
+ *       the update number and the description from source code comment for
+ *       each update function. This array is keyed by the update number.
+ */
+function update_get_update_list() {
+  // Make sure that the system module is first in the list of updates.
+  $ret = ['system' => []];
+
+  $modules = drupal_get_installed_schema_version(NULL, FALSE, TRUE);
+  foreach ($modules as $module => $schema_version) {
+    // Skip uninstalled and incompatible modules.
+    if ($schema_version == SCHEMA_UNINSTALLED || update_check_incompatibility($module)) {
+      continue;
+    }
+    // Display a requirements error if the user somehow has a schema version
+    // from the previous Drupal major version.
+    if ($schema_version < \Drupal::CORE_MINIMUM_SCHEMA_VERSION) {
+      $ret[$module]['warning'] = '<em>' . $module . '</em> module cannot be updated. Its schema version is ' . $schema_version . ', which is from an earlier major release of Drupal. You will need to <a href="https://www.drupal.org/node/2127611">migrate the data for this module</a> instead.';
+      continue;
+    }
+    // Otherwise, get the list of updates defined by this module.
+    $updates = drupal_get_schema_versions($module);
+    if ($updates !== FALSE) {
+      // \Drupal::moduleHandler()->invoke() returns NULL for non-existing hooks,
+      // so if no updates are removed, it will == 0.
+      $last_removed = \Drupal::moduleHandler()->invoke($module, 'update_last_removed');
+      if ($schema_version < $last_removed) {
+        $ret[$module]['warning'] = '<em>' . $module . '</em> module cannot be updated. Its schema version is ' . $schema_version . '. Updates up to and including ' . $last_removed . ' have been removed in this release. In order to update <em>' . $module . '</em> module, you will first <a href="https://www.drupal.org/upgrade">need to upgrade</a> to the last version in which these updates were available.';
+        continue;
+      }
+
+      foreach ($updates as $update) {
+        if ($update == \Drupal::CORE_MINIMUM_SCHEMA_VERSION) {
+          $ret[$module]['warning'] = '<em>' . $module . '</em> module cannot be updated. It contains an update numbered as ' . \Drupal::CORE_MINIMUM_SCHEMA_VERSION . ' which is reserved for the earliest installation of a module in Drupal ' . \Drupal::CORE_COMPATIBILITY . ', before any updates. In order to update <em>' . $module . '</em> module, you will need to install a version of the module with valid updates.';
+          continue 2;
+        }
+        if ($update > $schema_version) {
+          // The description for an update comes from its Doxygen.
+          $func = new ReflectionFunction($module . '_update_' . $update);
+          $description = str_replace(["\n", '*', '/'], '', $func->getDocComment());
+          $ret[$module]['pending'][$update] = "$update - $description";
+          if (!isset($ret[$module]['start'])) {
+            $ret[$module]['start'] = $update;
+          }
+        }
+      }
+      if (!isset($ret[$module]['start']) && isset($ret[$module]['pending'])) {
+        $ret[$module]['start'] = $schema_version;
+      }
+    }
+  }
+
+  if (empty($ret['system'])) {
+    unset($ret['system']);
+  }
+  return $ret;
+}
+
+/**
+ * Resolves dependencies in a set of module updates, and orders them correctly.
+ *
+ * This function receives a list of requested module updates and determines an
+ * appropriate order to run them in such that all update dependencies are met.
+ * Any updates whose dependencies cannot be met are included in the returned
+ * array but have the key 'allowed' set to FALSE; the calling function should
+ * take responsibility for ensuring that these updates are ultimately not
+ * performed.
+ *
+ * In addition, the returned array also includes detailed information about the
+ * dependency chain for each update, as provided by the depth-first search
+ * algorithm in Drupal\Component\Graph\Graph::searchAndSort().
+ *
+ * @param $starting_updates
+ *   An array whose keys contain the names of modules with updates to be run
+ *   and whose values contain the number of the first requested update for that
+ *   module.
+ *
+ * @return
+ *   An array whose keys are the names of all update functions within the
+ *   provided modules that would need to be run in order to fulfill the
+ *   request, arranged in the order in which the update functions should be
+ *   run. (This includes the provided starting update for each module and all
+ *   subsequent updates that are available.) The values are themselves arrays
+ *   containing all the keys provided by the
+ *   Drupal\Component\Graph\Graph::searchAndSort() algorithm, which encode
+ *   detailed information about the dependency chain for this update function
+ *   (for example: 'paths', 'reverse_paths', 'weight', and 'component'), as
+ *   well as the following additional keys:
+ *   - 'allowed': A boolean which is TRUE when the update function's
+ *     dependencies are met, and FALSE otherwise. Calling functions should
+ *     inspect this value before running the update.
+ *   - 'missing_dependencies': An array containing the names of any other
+ *     update functions that are required by this one but that are unavailable
+ *     to be run. This array will be empty when 'allowed' is TRUE.
+ *   - 'module': The name of the module that this update function belongs to.
+ *   - 'number': The number of this update function within that module.
+ *
+ * @see \Drupal\Component\Graph\Graph::searchAndSort()
+ */
+function update_resolve_dependencies($starting_updates) {
+  // Obtain a dependency graph for the requested update functions.
+  $update_functions = update_get_update_function_list($starting_updates);
+  $graph = update_build_dependency_graph($update_functions);
+
+  // Perform the depth-first search and sort on the results.
+  $graph_object = new Graph($graph);
+  $graph = $graph_object->searchAndSort();
+  uasort($graph, ['Drupal\Component\Utility\SortArray', 'sortByWeightElement']);
+
+  foreach ($graph as $function => &$data) {
+    $module = $data['module'];
+    $number = $data['number'];
+    // If the update function is missing and has not yet been performed, mark
+    // it and everything that ultimately depends on it as disallowed.
+    if (update_is_missing($module, $number, $update_functions) && !update_already_performed($module, $number)) {
+      $data['allowed'] = FALSE;
+      foreach (array_keys($data['paths']) as $dependent) {
+        $graph[$dependent]['allowed'] = FALSE;
+        $graph[$dependent]['missing_dependencies'][] = $function;
+      }
+    }
+    elseif (!isset($data['allowed'])) {
+      $data['allowed'] = TRUE;
+      $data['missing_dependencies'] = [];
+    }
+    // Now that we have finished processing this function, remove it from the
+    // graph if it was not part of the original list. This ensures that we
+    // never try to run any updates that were not specifically requested.
+    if (!isset($update_functions[$module][$number])) {
+      unset($graph[$function]);
+    }
+  }
+
+  return $graph;
+}
+
+/**
+ * Returns an organized list of update functions for a set of modules.
+ *
+ * @param $starting_updates
+ *   An array whose keys contain the names of modules and whose values contain
+ *   the number of the first requested update for that module.
+ *
+ * @return
+ *   An array containing all the update functions that should be run for each
+ *   module, including the provided starting update and all subsequent updates
+ *   that are available. The keys of the array contain the module names, and
+ *   each value is an ordered array of update functions, keyed by the update
+ *   number.
+ *
+ * @see update_resolve_dependencies()
+ */
+function update_get_update_function_list($starting_updates) {
+  // Go through each module and find all updates that we need (including the
+  // first update that was requested and any updates that run after it).
+  $update_functions = [];
+  foreach ($starting_updates as $module => $version) {
+    $update_functions[$module] = [];
+    $updates = drupal_get_schema_versions($module);
+    if ($updates !== FALSE) {
+      $max_version = max($updates);
+      if ($version <= $max_version) {
+        foreach ($updates as $update) {
+          if ($update >= $version) {
+            $update_functions[$module][$update] = $module . '_update_' . $update;
+          }
+        }
+      }
+    }
+  }
+  return $update_functions;
+}
+
+/**
+ * Constructs a graph which encodes the dependencies between module updates.
+ *
+ * This function returns an associative array which contains a "directed graph"
+ * representation of the dependencies between a provided list of update
+ * functions, as well as any outside update functions that they directly depend
+ * on but that were not in the provided list. The vertices of the graph
+ * represent the update functions themselves, and each edge represents a
+ * requirement that the first update function needs to run before the second.
+ * For example, consider this graph:
+ *
+ * system_update_8001 ---> system_update_8002 ---> system_update_8003
+ *
+ * Visually, this indicates that system_update_8001() must run before
+ * system_update_8002(), which in turn must run before system_update_8003().
+ *
+ * The function takes into account standard dependencies within each module, as
+ * shown above (i.e., the fact that each module's updates must run in numerical
+ * order), but also finds any cross-module dependencies that are defined by
+ * modules which implement hook_update_dependencies(), and builds them into the
+ * graph as well.
+ *
+ * @param $update_functions
+ *   An organized array of update functions, in the format returned by
+ *   update_get_update_function_list().
+ *
+ * @return
+ *   A multidimensional array representing the dependency graph, suitable for
+ *   passing in to Drupal\Component\Graph\Graph::searchAndSort(), but with extra
+ *   information about each update function also included. Each array key
+ *   contains the name of an update function, including all update functions
+ *   from the provided list as well as any outside update functions which they
+ *   directly depend on. Each value is an associative array containing the
+ *   following keys:
+ *   - 'edges': A representation of any other update functions that immediately
+ *     depend on this one. See Drupal\Component\Graph\Graph::searchAndSort() for
+ *     more details on the format.
+ *   - 'module': The name of the module that this update function belongs to.
+ *   - 'number': The number of this update function within that module.
+ *
+ * @see \Drupal\Component\Graph\Graph::searchAndSort()
+ * @see update_resolve_dependencies()
+ */
+function update_build_dependency_graph($update_functions) {
+  // Initialize an array that will define a directed graph representing the
+  // dependencies between update functions.
+  $graph = [];
+
+  // Go through each update function and build an initial list of dependencies.
+  foreach ($update_functions as $module => $functions) {
+    $previous_function = NULL;
+    foreach ($functions as $number => $function) {
+      // Add an edge to the directed graph representing the fact that each
+      // update function in a given module must run after the update that
+      // numerically precedes it.
+      if ($previous_function) {
+        $graph[$previous_function]['edges'][$function] = TRUE;
+      }
+      $previous_function = $function;
+
+      // Define the module and update number associated with this function.
+      $graph[$function]['module'] = $module;
+      $graph[$function]['number'] = $number;
+    }
+  }
+
+  // Now add any explicit update dependencies declared by modules.
+  $update_dependencies = update_retrieve_dependencies();
+  foreach ($graph as $function => $data) {
+    if (!empty($update_dependencies[$data['module']][$data['number']])) {
+      foreach ($update_dependencies[$data['module']][$data['number']] as $module => $number) {
+        $dependency = $module . '_update_' . $number;
+        $graph[$dependency]['edges'][$function] = TRUE;
+        $graph[$dependency]['module'] = $module;
+        $graph[$dependency]['number'] = $number;
+      }
+    }
+  }
+
+  return $graph;
+}
+
+/**
+ * Determines if a module update is missing or unavailable.
+ *
+ * @param $module
+ *   The name of the module.
+ * @param $number
+ *   The number of the update within that module.
+ * @param $update_functions
+ *   An organized array of update functions, in the format returned by
+ *   update_get_update_function_list(). This should represent all module
+ *   updates that are requested to run at the time this function is called.
+ *
+ * @return
+ *   TRUE if the provided module update is not installed or is not in the
+ *   provided list of updates to run; FALSE otherwise.
+ */
+function update_is_missing($module, $number, $update_functions) {
+  return !isset($update_functions[$module][$number]) || !function_exists($update_functions[$module][$number]);
+}
+
+/**
+ * Determines if a module update has already been performed.
+ *
+ * @param $module
+ *   The name of the module.
+ * @param $number
+ *   The number of the update within that module.
+ *
+ * @return
+ *   TRUE if the database schema indicates that the update has already been
+ *   performed; FALSE otherwise.
+ */
+function update_already_performed($module, $number) {
+  return $number <= drupal_get_installed_schema_version($module);
+}
+
+/**
+ * Invokes hook_update_dependencies() in all installed modules.
+ *
+ * This function is similar to \Drupal::moduleHandler()->invokeAll(), with the
+ * main difference that it does not require that a module be enabled to invoke
+ * its hook, only that it be installed. This allows the update system to
+ * properly perform updates even on modules that are currently disabled.
+ *
+ * @return
+ *   An array of return values obtained by merging the results of the
+ *   hook_update_dependencies() implementations in all installed modules.
+ *
+ * @see \Drupal\Core\Extension\ModuleHandlerInterface::invokeAll()
+ * @see hook_update_dependencies()
+ */
+function update_retrieve_dependencies() {
+  $return = [];
+  // Get a list of installed modules, arranged so that we invoke their hooks in
+  // the same order that \Drupal::moduleHandler()->invokeAll() does.
+  foreach (\Drupal::keyValue('system.schema')->getAll() as $module => $schema) {
+    if ($schema == SCHEMA_UNINSTALLED) {
+      // Nothing to upgrade.
+      continue;
+    }
+    $function = $module . '_update_dependencies';
+    // Ensure install file is loaded.
+    module_load_install($module);
+    if (function_exists($function)) {
+      $updated_dependencies = $function();
+      // Each implementation of hook_update_dependencies() returns a
+      // multidimensional, associative array containing some keys that
+      // represent module names (which are strings) and other keys that
+      // represent update function numbers (which are integers). We cannot use
+      // array_merge_recursive() to properly merge these results, since it
+      // treats strings and integers differently. Therefore, we have to
+      // explicitly loop through the expected array structure here and perform
+      // the merge manually.
+      if (isset($updated_dependencies) && is_array($updated_dependencies)) {
+        foreach ($updated_dependencies as $module_name => $module_data) {
+          foreach ($module_data as $update_version => $update_data) {
+            foreach ($update_data as $module_dependency => $update_dependency) {
+              // If there are redundant dependencies declared for the same
+              // update function (so that it is declared to depend on more than
+              // one update from a particular module), record the dependency on
+              // the highest numbered update here, since that automatically
+              // implies the previous ones. For example, if one module's
+              // implementation of hook_update_dependencies() required this
+              // ordering:
+              //
+              // system_update_8002 ---> user_update_8001
+              //
+              // but another module's implementation of the hook required this
+              // one:
+              //
+              // system_update_8003 ---> user_update_8001
+              //
+              // we record the second one, since system_update_8002() is always
+              // guaranteed to run before system_update_8003() anyway (within
+              // an individual module, updates are always run in numerical
+              // order).
+              if (!isset($return[$module_name][$update_version][$module_dependency]) || $update_dependency > $return[$module_name][$update_version][$module_dependency]) {
+                $return[$module_name][$update_version][$module_dependency] = $update_dependency;
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  return $return;
+}
+
+/**
+ * Replace permissions during update.
+ *
+ * This function can replace one permission to several or even delete an old
+ * one.
+ *
+ * @param array $replace
+ *   An associative array. The keys are the old permissions the values are lists
+ *   of new permissions. If the list is an empty array, the old permission is
+ *   removed.
+ */
+function update_replace_permissions($replace) {
+  $prefix = 'user.role.';
+  $cut = strlen($prefix);
+  $role_names = \Drupal::service('config.storage')->listAll($prefix);
+  foreach ($role_names as $role_name) {
+    $rid = substr($role_name, $cut);
+    $config = \Drupal::config("user.role.$rid");
+    $permissions = $config->get('permissions') ?: [];
+    foreach ($replace as $old_permission => $new_permissions) {
+      if (($index = array_search($old_permission, $permissions)) !== FALSE) {
+        unset($permissions[$index]);
+        $permissions = array_unique(array_merge($permissions, $new_permissions));
+      }
+    }
+    $config
+      ->set('permissions', $permissions)
+      ->save();
+  }
+}