update.inc 29.2 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
<?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.
 */

11
use Drupal\Component\Graph\Graph;
12
use Drupal\Core\Utility\Error;
13

14
/**
15
 * Tests the compatibility of a module or theme.
16 17 18 19 20 21
 */
function update_check_incompatibility($name, $type = 'module') {
  static $themes, $modules;

  // Store values of expensive functions for future use.
  if (empty($themes) || empty($modules)) {
22 23 24
    // 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.
25
    $themes = \Drupal::service('theme_handler')->rebuildThemeData();
26
    $modules = \Drupal::service('extension.list.module')->reset()->getList();
27 28 29 30 31 32 33 34 35
  }

  if ($type == 'module' && isset($modules[$name])) {
    $file = $modules[$name];
  }
  elseif ($type == 'theme' && isset($themes[$name])) {
    $file = $themes[$name];
  }
  if (!isset($file)
36
      || $file->info['core_incompatible']
37
      || version_compare(phpversion(), $file->info['php']) < 0) {
38 39 40 41 42
    return TRUE;
  }
  return FALSE;
}

43
/**
44 45 46
 * Returns whether the minimum schema requirement has been satisfied.
 *
 * @return array
47
 *   A requirements info array.
48
 */
49
function update_system_schema_requirements() {
50
  $requirements = [];
51

52
  $system_schema = drupal_get_installed_schema_version('system');
53

54 55
  $requirements['minimum schema']['title'] = 'Minimum schema version';
  if ($system_schema >= \Drupal::CORE_MINIMUM_SCHEMA_VERSION) {
56
    $requirements['minimum schema'] += [
57 58
      'value' => 'The installed schema version meets the minimum.',
      'description' => 'Schema version: ' . $system_schema,
59
    ];
60 61
  }
  else {
62
    $requirements['minimum schema'] += [
63 64
      'value' => 'The installed schema version does not meet the minimum.',
      'severity' => REQUIREMENT_ERROR,
65
      '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.',
66
    ];
67
  }
68 69

  return $requirements;
70 71
}

72
/**
73
 * Checks update requirements and reports errors and (optionally) warnings.
74
 */
75
function update_check_requirements() {
76 77 78 79 80
  // Because this is one of the earliest points in the update process,
  // detect and fix missing schema versions for modules here to ensure
  // it runs on all update code paths.
  _update_fix_missing_schema();

81
  // Check requirements of all loaded modules.
82
  $requirements = \Drupal::moduleHandler()->invokeAll('requirements', ['update']);
83
  $requirements += update_system_schema_requirements();
84
  return $requirements;
85
}
86

87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
/**
 * Helper to detect and fix 'missing' schema information.
 *
 * Repairs the case where a module has no schema version recorded.
 * This has to be done prior to updates being run, otherwise the update
 * system would detect and attempt to run all historical updates for a
 * module.
 *
 * @todo: remove in a major version after
 * https://www.drupal.org/project/drupal/issues/3130037 has been fixed.
 */
function _update_fix_missing_schema() {
  $versions = \Drupal::keyValue('system.schema')->getAll();
  $module_handler = \Drupal::moduleHandler();
  $enabled_modules = $module_handler->getModuleList();

  foreach (array_keys($enabled_modules) as $module) {
    // All modules should have a recorded schema version, but when they
    // don't, detect and fix the problem.
    if (!isset($versions[$module])) {
      // Ensure the .install file is loaded.
      module_load_install($module);
      $all_updates = drupal_get_schema_versions($module);
      // If the schema version of a module hasn't been recorded, we cannot
      // know the actual schema version a module is at, because
      // no updates will ever have been run on the site and it was not set
      // correctly when the module was installed, so instead set it to
      // the same as the last update. This means that updates will proceed
      // again the next time the module is updated and a new update is
      // added. Updates added in between the module being installed and the
      // schema version being fixed here (if any have been added) will never
      // be run, but we have no way to identify which updates these are.
      if ($all_updates) {
        $last_update = max($all_updates);
      }
      else {
        $last_update = \Drupal::CORE_MINIMUM_SCHEMA_VERSION;
      }
      // If the module implements hook_update_last_removed() use the
      // value of that if it's higher than the schema versions found so
      // far.
      if ($last_removed = $module_handler->invoke($module, 'update_last_removed')) {
        $last_update = max($last_update, $last_removed);
      }
      drupal_set_installed_schema_version($module, $last_update);
      $args = ['%module' => $module, '%last_update_hook' => $module . '_update_' . $last_update . '()'];
      \Drupal::messenger()->addWarning(t('Schema information for module %module was missing from the database. You should manually review the module updates and your database to check if any updates have been skipped up to, and including, %last_update_hook.', $args));
      \Drupal::logger('update')->warning('Schema information for module %module was missing from the database. You should manually review the module updates and your database to check if any updates have been skipped up to, and including, %last_update_hook.', $args);
    }
  }
}

139
/**
140
 * Forces a module to a given schema version.
141
 *
142
 * This function is rarely necessary.
143
 *
144 145 146 147
 * @param string $module
 *   Name of the module.
 * @param string $schema_version
 *   The schema version the module should be set to.
148
 */
149
function update_set_schema($module, $schema_version) {
150
  \Drupal::keyValue('system.schema')->set($module, $schema_version);
151 152 153 154 155
  \Drupal::service('extension.list.profile')->reset();
  \Drupal::service('extension.list.module')->reset();
  \Drupal::service('extension.list.theme_engine')->reset();
  \Drupal::service('extension.list.theme')->reset();
  drupal_static_reset('drupal_get_installed_schema_version');
156
}
157

158
/**
159 160
 * Implements callback_batch_operation().
 *
161
 * Performs one update and stores the results for display on the results page.
162
 *
163 164 165 166 167 168 169 170 171 172
 * 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
173 174
 * Drupal\Core\Utility\UpdateException with an appropriate error message, for
 * example:
175
 * @code
176
 * use Drupal\Core\Utility\UpdateException;
177
 * throw new UpdateException('Description of what went wrong');
178 179
 * @endcode
 *
180 181 182 183
 * 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.
184
 *
185 186 187 188 189
 * 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.
 *
190 191 192 193
 * @param $module
 *   The module whose update will be run.
 * @param $number
 *   The update number to run.
194 195 196 197
 * @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.
198
 * @param $context
199 200 201
 *   The batch context array.
 *
 * @see update_resolve_dependencies()
202
 */
203 204 205 206 207
function update_do_one($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.
208
  if (!empty($context['results']['#abort']) && array_intersect($context['results']['#abort'], array_merge($dependency_map, [$function]))) {
209 210 211
    return;
  }

212
  $ret = [];
213
  if (function_exists($function)) {
214 215 216 217
    try {
      $ret['results']['query'] = $function($context['sandbox']);
      $ret['results']['success'] = TRUE;
    }
218 219 220
    // @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.
221
    // @see https://www.drupal.org/node/2564311
222
    catch (Exception $e) {
223 224
      watchdog_exception('update', $e);

225
      $variables = Error::decodeException($e);
226
      unset($variables['backtrace']);
227
      $ret['#abort'] = ['success' => FALSE, 'query' => t('%type: @message in %function (line %line of %file).', $variables)];
228
    }
229 230
  }

231 232 233 234 235
  if (isset($context['sandbox']['#finished'])) {
    $context['finished'] = $context['sandbox']['#finished'];
    unset($context['sandbox']['#finished']);
  }

236
  if (!isset($context['results'][$module])) {
237
    $context['results'][$module] = [];
238 239
  }
  if (!isset($context['results'][$module][$number])) {
240
    $context['results'][$module][$number] = [];
241 242 243 244
  }
  $context['results'][$module][$number] = array_merge($context['results'][$module][$number], $ret);

  if (!empty($ret['#abort'])) {
245 246
    // Record this function in the list of updates that were aborted.
    $context['results']['#abort'][] = $function;
247
  }
248

249
  // Record the schema update if it was completed successfully.
250
  if ($context['finished'] == 1 && empty($ret['#abort'])) {
251 252 253
    drupal_set_installed_schema_version($module, $number);
  }

254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
  $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;

281 282 283
      if (!isset($context['sandbox']['#finished']) || (isset($context['sandbox']['#finished']) && $context['sandbox']['#finished'] >= 1)) {
        \Drupal::service('update.post_update_registry')->registerInvokedUpdates([$function]);
      }
284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305
    }
    // @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])) {
306
    $context['results'][$module][$name] = [];
307 308 309 310 311 312 313 314 315
  }
  $context['results'][$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]);
316 317
}

318
/**
319
 * Returns a list of all the pending database updates.
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
 *
 * @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.
338
  $ret = ['system' => []];
339

340
  $modules = drupal_get_installed_schema_version(NULL, FALSE, TRUE);
341 342
  /** @var \Drupal\Core\Extension\ExtensionList $extension_list */
  $extension_list = \Drupal::service('extension.list.module');
343
  foreach ($modules as $module => $schema_version) {
344
    // Skip uninstalled and incompatible modules.
345
    if ($schema_version == SCHEMA_UNINSTALLED || $extension_list->checkIncompatibility($module)) {
346 347
      continue;
    }
348 349 350
    // 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) {
351
      $ret[$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.';
352 353
      continue;
    }
354
    // Otherwise, get the list of updates defined by this module.
355
    $updates = drupal_get_schema_versions($module);
356
    if ($updates !== FALSE) {
357
      foreach ($updates as $update) {
358
        if ($update == \Drupal::CORE_MINIMUM_SCHEMA_VERSION) {
359
          $ret[$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>' . $module . '</em> module, you will need to install a version of the module with valid updates.';
360 361
          continue 2;
        }
362
        if ($update > $schema_version) {
363
          // The description for an update comes from its Doxygen.
364
          $func = new ReflectionFunction($module . '_update_' . $update);
365
          $description = str_replace(["\n", '*', '/'], '', $func->getDocComment());
366 367 368
          $ret[$module]['pending'][$update] = "$update - $description";
          if (!isset($ret[$module]['start'])) {
            $ret[$module]['start'] = $update;
369 370 371 372 373 374 375 376
          }
        }
      }
      if (!isset($ret[$module]['start']) && isset($ret[$module]['pending'])) {
        $ret[$module]['start'] = $schema_version;
      }
    }
  }
377

378 379 380 381 382 383
  if (empty($ret['system'])) {
    unset($ret['system']);
  }
  return $ret;
}

384 385 386 387 388 389 390 391 392 393 394 395
/**
 * 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
396
 * algorithm in Drupal\Component\Graph\Graph::searchAndSort().
397 398 399 400 401 402 403 404 405 406 407 408
 *
 * @param $starting_updates
 *   An array whose keys contain the names of modules with updates to be run
 *   and whose values contain the number of the first requested update for that
 *   module.
 *
 * @return
 *   An array whose keys are the names of all update functions within the
 *   provided modules that would need to be run in order to fulfill the
 *   request, arranged in the order in which the update functions should be
 *   run. (This includes the provided starting update for each module and all
 *   subsequent updates that are available.) The values are themselves arrays
409 410 411
 *   containing all the keys provided by the
 *   Drupal\Component\Graph\Graph::searchAndSort() algorithm, which encode
 *   detailed information about the dependency chain for this update function
412 413
 *   (for example: 'paths', 'reverse_paths', 'weight', and 'component'), as
 *   well as the following additional keys:
414 415 416 417 418 419 420 421 422
 *   - 'allowed': A boolean which is TRUE when the update function's
 *     dependencies are met, and FALSE otherwise. Calling functions should
 *     inspect this value before running the update.
 *   - 'missing_dependencies': An array containing the names of any other
 *     update functions that are required by this one but that are unavailable
 *     to be run. This array will be empty when 'allowed' is TRUE.
 *   - 'module': The name of the module that this update function belongs to.
 *   - 'number': The number of this update function within that module.
 *
423
 * @see \Drupal\Component\Graph\Graph::searchAndSort()
424 425 426 427 428 429
 */
function update_resolve_dependencies($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);

430 431 432
  // Perform the depth-first search and sort on the results.
  $graph_object = new Graph($graph);
  $graph = $graph_object->searchAndSort();
433
  uasort($graph, ['Drupal\Component\Utility\SortArray', 'sortByWeightElement']);
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448

  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;
449
      $data['missing_dependencies'] = [];
450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480
    }
    // Now that we have finished processing this function, remove it from the
    // graph if it was not part of the original list. This ensures that we
    // never try to run any updates that were not specifically requested.
    if (!isset($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).
481
  $update_functions = [];
482
  foreach ($starting_updates as $module => $version) {
483
    $update_functions[$module] = [];
484
    $updates = drupal_get_schema_versions($module);
485 486 487 488 489 490 491
    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;
          }
492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509
        }
      }
    }
  }
  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:
 *
510
 * system_update_8001 ---> system_update_8002 ---> system_update_8003
511
 *
512 513
 * Visually, this indicates that system_update_8001() must run before
 * system_update_8002(), which in turn must run before system_update_8003().
514 515 516 517 518 519 520 521 522 523 524 525 526
 *
 * 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 $update_functions
 *   An organized array of update functions, in the format returned by
 *   update_get_update_function_list().
 *
 * @return
 *   A multidimensional array representing the dependency graph, suitable for
527 528 529 530 531 532
 *   passing in to Drupal\Component\Graph\Graph::searchAndSort(), but with extra
 *   information about each update function also included. Each array key
 *   contains the name of an update function, including all update functions
 *   from the provided list as well as any outside update functions which they
 *   directly depend on. Each value is an associative array containing the
 *   following keys:
533
 *   - 'edges': A representation of any other update functions that immediately
534 535
 *     depend on this one. See Drupal\Component\Graph\Graph::searchAndSort() for
 *     more details on the format.
536 537 538
 *   - 'module': The name of the module that this update function belongs to.
 *   - 'number': The number of this update function within that module.
 *
539
 * @see \Drupal\Component\Graph\Graph::searchAndSort()
540 541 542 543 544
 * @see update_resolve_dependencies()
 */
function update_build_dependency_graph($update_functions) {
  // Initialize an array that will define a directed graph representing the
  // dependencies between update functions.
545
  $graph = [];
546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565

  // 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.
566
  $update_dependencies = update_retrieve_dependencies();
567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
  foreach ($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);
}

/**
618
 * Invokes hook_update_dependencies() in all installed modules.
619
 *
620 621 622 623
 * 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.
624 625
 *
 * @return
626 627
 *   An array of return values obtained by merging the results of the
 *   hook_update_dependencies() implementations in all installed modules.
628
 *
629
 * @see \Drupal\Core\Extension\ModuleHandlerInterface::invokeAll()
630
 * @see hook_update_dependencies()
631
 */
632
function update_retrieve_dependencies() {
633
  $return = [];
634
  // Get a list of installed modules, arranged so that we invoke their hooks in
635
  // the same order that \Drupal::moduleHandler()->invokeAll() does.
636
  foreach (\Drupal::keyValue('system.schema')->getAll() as $module => $schema) {
637 638 639 640
    if ($schema == SCHEMA_UNINSTALLED) {
      // Nothing to upgrade.
      continue;
    }
641
    $function = $module . '_update_dependencies';
642 643
    // Ensure install file is loaded.
    module_load_install($module);
644
    if (function_exists($function)) {
645
      $updated_dependencies = $function();
646 647 648 649 650 651 652 653
      // Each implementation of hook_update_dependencies() returns a
      // multidimensional, associative array containing some keys that
      // represent module names (which are strings) and other keys that
      // represent update function numbers (which are integers). We cannot use
      // array_merge_recursive() to properly merge these results, since it
      // treats strings and integers differently. Therefore, we have to
      // explicitly loop through the expected array structure here and perform
      // the merge manually.
654 655 656
      if (isset($updated_dependencies) && is_array($updated_dependencies)) {
        foreach ($updated_dependencies as $module_name => $module_data) {
          foreach ($module_data as $update_version => $update_data) {
657 658 659 660 661 662 663 664 665
            foreach ($update_data as $module_dependency => $update_dependency) {
              // If there are redundant dependencies declared for the same
              // update function (so that it is declared to depend on more than
              // one update from a particular module), record the dependency on
              // the highest numbered update here, since that automatically
              // implies the previous ones. For example, if one module's
              // implementation of hook_update_dependencies() required this
              // ordering:
              //
666
              // system_update_8002 ---> user_update_8001
667 668 669 670
              //
              // but another module's implementation of the hook required this
              // one:
              //
671
              // system_update_8003 ---> user_update_8001
672
              //
673 674
              // we record the second one, since system_update_8002() is always
              // guaranteed to run before system_update_8003() anyway (within
675 676
              // an individual module, updates are always run in numerical
              // order).
677 678
              if (!isset($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;
679 680 681 682
              }
            }
          }
        }
683 684 685 686 687 688 689
      }
    }
  }

  return $return;
}

690 691 692 693 694 695 696 697 698 699 700 701 702 703
/**
 * 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);
704
  $role_names = \Drupal::service('config.storage')->listAll($prefix);
705 706
  foreach ($role_names as $role_name) {
    $rid = substr($role_name, $cut);
707
    $config = \Drupal::config("user.role.$rid");
708
    $permissions = $config->get('permissions') ?: [];
709 710 711 712 713 714 715 716 717 718 719
    foreach ($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();
  }
}