install.inc 35.6 KB
Newer Older
1 2
<?php

3
/**
4 5 6 7
 * @file
 * API functions for installing modules and themes.
 */

8
use Drupal\Component\Utility\Unicode;
9
use Symfony\Component\HttpFoundation\RedirectResponse;
10
use Drupal\Component\Utility\Crypt;
11
use Drupal\Component\Utility\OpCodeCache;
12
use Drupal\Component\Utility\UrlHelper;
13
use Drupal\Core\Extension\ExtensionDiscovery;
14
use Drupal\Core\Site\Settings;
15

16 17 18
/**
 * Requirement severity -- Informational message only.
 */
19
const REQUIREMENT_INFO = -1;
20 21 22 23

/**
 * Requirement severity -- Requirement successfully met.
 */
24
const REQUIREMENT_OK = 0;
25 26 27 28

/**
 * Requirement severity -- Warning condition; proceed but flag warning.
 */
29
const REQUIREMENT_WARNING = 1;
30 31 32 33

/**
 * Requirement severity -- Error condition; abort installation.
 */
34
const REQUIREMENT_ERROR = 2;
35

36 37 38
/**
 * File permission check -- File exists.
 */
39
const FILE_EXIST = 1;
40 41 42 43

/**
 * File permission check -- File is readable.
 */
44
const FILE_READABLE = 2;
45 46 47 48

/**
 * File permission check -- File is writable.
 */
49
const FILE_WRITABLE = 4;
50 51 52 53

/**
 * File permission check -- File is executable.
 */
54
const FILE_EXECUTABLE = 8;
55 56 57 58

/**
 * File permission check -- File does not exist.
 */
59
const FILE_NOT_EXIST = 16;
60 61 62 63

/**
 * File permission check -- File is not readable.
 */
64
const FILE_NOT_READABLE = 32;
65 66 67 68

/**
 * File permission check -- File is not writable.
 */
69
const FILE_NOT_WRITABLE = 64;
70 71 72 73

/**
 * File permission check -- File is not executable.
 */
74
const FILE_NOT_EXECUTABLE = 128;
75

76
/**
77
 * Loads .install files for installed modules to initialize the update system.
78 79
 */
function drupal_load_updates() {
80 81 82 83
  foreach (drupal_get_installed_schema_version(NULL, FALSE, TRUE) as $module => $schema_version) {
    if ($schema_version > -1) {
      module_load_install($module);
    }
84 85 86
  }
}

87
/**
88
 * Loads the installation profile, extracting its defined distribution name.
89 90
 *
 * @return
91
 *   The distribution name defined in the profile's .info.yml file. Defaults to
92
 *   "Drupal" if none is explicitly provided by the installation profile.
93 94
 *
 * @see install_profile_info()
95
 */
96
function drupal_install_profile_distribution_name() {
97 98
  // During installation, the profile information is stored in the global
  // installation state (it might not be saved anywhere yet).
99
  $info = array();
100 101
  if (drupal_installation_attempted()) {
    global $install_state;
102 103 104
    if (isset($install_state['profile_info'])) {
      $info = $install_state['profile_info'];
    }
105 106 107 108
  }
  // At all other times, we load the profile via standard methods.
  else {
    $profile = drupal_get_profile();
109
    $info = system_get_info('module', $profile);
110
  }
111
  return isset($info['distribution']['name']) ? $info['distribution']['name'] : 'Drupal';
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
/**
 * Loads the installation profile, extracting its defined version.
 *
 * @return string Distribution version defined in the profile's .info.yml file.
 * Defaults to \Drupal::VERSION if no version is explicitly provided
 * by the installation profile.
 *
 * @see install_profile_info()
 */
function drupal_install_profile_distribution_version() {
  // During installation, the profile information is stored in the global
  // installation state (it might not be saved anywhere yet).
  if (drupal_installation_attempted()) {
    global $install_state;
    return isset($install_state['profile_info']['version']) ? $install_state['profile_info']['version'] : \Drupal::VERSION;
  }
  // At all other times, we load the profile via standard methods.
  else {
    $profile = drupal_get_profile();
    $info = system_get_info('module', $profile);
    return $info['version'];
  }
}

138
/**
139
 * Detects all supported databases that are compiled into PHP.
140 141 142 143 144
 *
 * @return
 *  An array of database types compiled into PHP.
 */
function drupal_detect_database_types() {
145 146 147 148 149 150 151 152 153 154
  $databases = drupal_get_database_types();

  foreach ($databases as $driver => $installer) {
    $databases[$driver] = $installer->name();
  }

  return $databases;
}

/**
155
 * Returns all supported database driver installer objects.
156
 *
157 158
 * @return \Drupal\Core\Database\Install\Tasks[]
 *   An array of available database driver installer objects.
159 160
 */
function drupal_get_database_types() {
161
  $databases = array();
162
  $drivers = array();
163

164 165
  // The internal database driver name is any valid PHP identifier.
  $mask = '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '$/';
166 167 168 169 170
  $files = file_scan_directory(DRUPAL_ROOT . '/core/lib/Drupal/Core/Database/Driver', $mask, array('recurse' => FALSE));
  if (is_dir(DRUPAL_ROOT . '/drivers/lib/Drupal/Driver/Database')) {
    $files += file_scan_directory(DRUPAL_ROOT . '/drivers/lib/Drupal/Driver/Database/', $mask, array('recurse' => FALSE));
  }
  foreach ($files as $file) {
171
    if (file_exists($file->uri . '/Install/Tasks.php')) {
172 173
      $drivers[$file->filename] = $file->uri;
    }
174 175
  }
  foreach ($drivers as $driver => $file) {
176
    $installer = db_installer_object($driver);
177
    if ($installer->installable()) {
178
      $databases[$driver] = $installer;
179 180
    }
  }
181

182
  // Usability: unconditionally put the MySQL driver on top.
183 184 185 186 187
  if (isset($databases['mysql'])) {
    $mysql_database = $databases['mysql'];
    unset($databases['mysql']);
    $databases = array('mysql' => $mysql_database) + $databases;
  }
188

189 190 191
  return $databases;
}

192
/**
193
 * Replaces values in settings.php with values in the submitted array.
194
 *
195 196 197 198
 * This function replaces values in place if possible, even for
 * multidimensional arrays. This way the old settings do not linger,
 * overridden and also the doxygen on a value remains where it should be.
 *
199
 * @param $settings
200 201 202 203 204
 *   An array of settings that need to be updated. Multidimensional arrays
 *   are dumped up to a stdClass object. The object can have value, required
 *   and comment properties.
 *   @code
 *   $settings['config_directories'] = array(
205 206
 *     CONFIG_SYNC_DIRECTORY => (object) array(
 *       'value' => 'config_hash/sync',
207
 *       'required' => TRUE,
208 209 210 211 212
 *     ),
 *   );
 *   @endcode
 *   gets dumped as:
 *   @code
213
 *   $config_directories['sync'] = 'config_hash/sync'
214
 *   @endcode
215
 */
216 217
function drupal_rewrite_settings($settings = array(), $settings_file = NULL) {
  if (!isset($settings_file)) {
218
    $settings_file = \Drupal::service('site.path') . '/settings.php';
219
  }
220
  // Build list of setting names and insert the values into the global namespace.
221
  $variable_names = array();
222
  $settings_settings = array();
223
  foreach ($settings as $setting => $data) {
224 225 226 227 228 229
    if ($setting != 'settings') {
      _drupal_rewrite_settings_global($GLOBALS[$setting], $data);
    }
    else {
      _drupal_rewrite_settings_global($settings_settings, $data);
    }
230
    $variable_names['$' . $setting] = $setting;
231
  }
232
  $contents = file_get_contents($settings_file);
233
  if ($contents !== FALSE) {
234 235 236 237
    // Initialize the contents for the settings.php file if it is empty.
    if (trim($contents) === '') {
      $contents = "<?php\n";
    }
238 239
    // Step through each token in settings.php and replace any variables that
    // are in the passed-in array.
240 241
    $buffer = '';
    $state = 'default';
242
    foreach (token_get_all($contents) as $token) {
243 244
      if (is_array($token)) {
        list($type, $value) = $token;
245
      }
246
      else {
247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324
        $type = -1;
        $value = $token;
      }
      // Do not operate on whitespace.
      if (!in_array($type, array(T_WHITESPACE, T_COMMENT, T_DOC_COMMENT))) {
        switch ($state) {
          case 'default':
            if ($type === T_VARIABLE && isset($variable_names[$value])) {
              // This will be necessary to unset the dumped variable.
              $parent = &$settings;
              // This is the current index in parent.
              $index = $variable_names[$value];
              // This will be necessary for descending into the array.
              $current = &$parent[$index];
              $state = 'candidate_left';
            }
            break;
          case 'candidate_left':
            if ($value == '[') {
              $state = 'array_index';
            }
            if ($value == '=') {
              $state = 'candidate_right';
            }
            break;
          case 'array_index':
            if (_drupal_rewrite_settings_is_array_index($type, $value)) {
              $index = trim($value, '\'"');
              $state = 'right_bracket';
            }
            else {
              // $a[foo()] or $a[$bar] or something like that.
              throw new Exception('invalid array index');
            }
            break;
          case 'right_bracket':
            if ($value == ']') {
              if (isset($current[$index])) {
                // If the new settings has this index, descend into it.
                $parent = &$current;
                $current = &$parent[$index];
                $state = 'candidate_left';
              }
              else {
                // Otherwise, jump back to the default state.
                $state = 'wait_for_semicolon';
              }
            }
            else {
              // $a[1 + 2].
              throw new Exception('] expected');
            }
            break;
          case 'candidate_right':
            if (_drupal_rewrite_settings_is_simple($type, $value)) {
              $value = _drupal_rewrite_settings_dump_one($current);
              // Unsetting $current would not affect $settings at all.
              unset($parent[$index]);
              // Skip the semicolon because _drupal_rewrite_settings_dump_one() added one.
              $state = 'semicolon_skip';
            }
            else {
              $state = 'wait_for_semicolon';
            }
            break;
          case 'wait_for_semicolon':
            if ($value == ';') {
              $state = 'default';
            }
            break;
          case 'semicolon_skip':
            if ($value == ';') {
              $value = '';
              $state = 'default';
            }
            else {
              // If the expression was $a = 1 + 2; then we replaced 1 and
              // the + is unexpected.
325
              throw new Exception('Unexpected token after replacing value.');
326 327
            }
            break;
328 329
        }
      }
330
      $buffer .= $value;
331
    }
332 333
    foreach ($settings as $name => $setting) {
      $buffer .= _drupal_rewrite_settings_dump($setting, '$' . $name);
334 335
    }

336
    // Write the new settings file.
337
    if (file_put_contents($settings_file, $buffer) === FALSE) {
338
      throw new Exception(t('Failed to modify %settings. Verify the file permissions.', array('%settings' => $settings_file)));
339
    }
340 341 342 343
    else {
      // In case any $settings variables were written, import them into the
      // Settings singleton.
      if (!empty($settings_settings)) {
344
        $old_settings = Settings::getAll();
345 346
        new Settings($settings_settings + $old_settings);
      }
347 348 349 350 351
      // The existing settings.php file might have been included already. In
      // case an opcode cache is enabled, the rewritten contents of the file
      // will not be reflected in this process. Ensure to invalidate the file
      // in case an opcode cache is enabled.
      OpCodeCache::invalidate(DRUPAL_ROOT . '/' . $settings_file);
352
    }
353 354
  }
  else {
355
    throw new Exception(t('Failed to open %settings. Verify the file permissions.', array('%settings' => $settings_file)));
356 357 358
  }
}

359 360 361 362 363 364
/**
 * Helper for drupal_rewrite_settings().
 *
 * Checks whether this token represents a scalar or NULL.
 *
 * @param int $type
365
 *   The token type.
366 367 368 369 370
 * @param string $value
 *   The value of the token.
 *
 * @return bool
 *   TRUE if this token represents a scalar or NULL.
371 372
 *
 * @see token_name()
373 374 375 376 377 378 379 380 381 382 383 384 385 386
 */
function _drupal_rewrite_settings_is_simple($type, $value) {
  $is_integer = $type == T_LNUMBER;
  $is_float = $type == T_DNUMBER;
  $is_string = $type == T_CONSTANT_ENCAPSED_STRING;
  $is_boolean_or_null = $type == T_STRING && in_array(strtoupper($value), array('TRUE', 'FALSE', 'NULL'));
  return $is_integer || $is_float || $is_string || $is_boolean_or_null;
}


/**
 * Helper for drupal_rewrite_settings().
 *
 * Checks whether this token represents a valid array index: a number or a
387
 * string.
388 389
 *
 * @param int $type
390
 *   The token type.
391 392 393
 *
 * @return bool
 *   TRUE if this token represents a number or a string.
394 395
 *
 * @see token_name()
396 397 398 399 400 401 402 403 404 405 406 407 408
 */
function _drupal_rewrite_settings_is_array_index($type) {
  $is_integer = $type == T_LNUMBER;
  $is_float = $type == T_DNUMBER;
  $is_string = $type == T_CONSTANT_ENCAPSED_STRING;
  return $is_integer || $is_float || $is_string;
}

/**
 * Helper for drupal_rewrite_settings().
 *
 * Makes the new settings global.
 *
409
 * @param array|null $ref
410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458
 *   A reference to a nested index in $GLOBALS.
 * @param array|object $variable
 *   The nested value of the setting being copied.
 */
function _drupal_rewrite_settings_global(&$ref, $variable) {
  if (is_object($variable)) {
    $ref = $variable->value;
  }
  else {
    foreach ($variable as $k => $v) {
      _drupal_rewrite_settings_global($ref[$k], $v);
    }
  }
}

/**
 * Helper for drupal_rewrite_settings().
 *
 * Dump the relevant value properties.
 *
 * @param array|object $variable
 *   The container for variable values.
 * @param string $variable_name
 *   Name of variable.
 * @return string
 *   A string containing valid PHP code of the variable suitable for placing
 *   into settings.php.
 */
function _drupal_rewrite_settings_dump($variable, $variable_name) {
  $return = '';
  if (is_object($variable)) {
    if (!empty($variable->required)) {
      $return .= _drupal_rewrite_settings_dump_one($variable, "$variable_name = ", "\n");
    }
  }
  else {
    foreach ($variable as $k => $v) {
      $return .= _drupal_rewrite_settings_dump($v, $variable_name . "['" . $k . "']");
    }
  }
  return $return;
}


/**
 * Helper for drupal_rewrite_settings().
 *
 * Dump the value of a value property and adds the comment if it exists.
 *
459
 * @param object $variable
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477
 *   A stdClass object with at least a value property.
 * @param string $prefix
 *   A string to prepend to the variable's value.
 * @param string $suffix
 *   A string to append to the variable's value.
 * @return string
 *   A string containing valid PHP code of the variable suitable for placing
 *   into settings.php.
 */
function _drupal_rewrite_settings_dump_one(\stdClass $variable, $prefix = '', $suffix = '') {
  $return = $prefix . var_export($variable->value, TRUE) . ';';
  if (!empty($variable->comment)) {
    $return .= ' // ' . $variable->comment;
  }
  $return .= $suffix;
  return $return;
}

478 479 480 481 482 483
/**
 * Creates the config directory and ensures it is operational.
 *
 * @see install_settings_form_submit()
 * @see update_prepare_d8_bootstrap()
 */
484
function drupal_install_config_directories() {
485
  global $config_directories;
486 487 488

  // Add a randomized config directory name to settings.php, unless it was
  // manually defined in the existing already.
489 490
  $settings = [];
  $config_directories_hash = Crypt::randomBytesBase64(55);
491 492 493
  if (empty($config_directories[CONFIG_SYNC_DIRECTORY])) {
    $settings['config_directories'][CONFIG_SYNC_DIRECTORY] = (object) [
      'value' => \Drupal::service('site.path') . '/files/config_' . $config_directories_hash . '/sync',
494 495 496 497 498
      'required' => TRUE,
    ];
  }

  if (!empty($settings)) {
499 500 501 502
    // Rewrite settings.php, which also sets the value as global variable.
    drupal_rewrite_settings($settings);
  }

503 504 505 506 507 508
  // This should never fail, since if the config directory was specified in
  // settings.php it will have already been created and verified earlier, and
  // if it wasn't specified in settings.php, it is created here inside the
  // public files directory, which has already been verified to be writable
  // itself. But if it somehow fails anyway, the installation cannot proceed.
  // Bail out using a similar error message as in system_requirements().
509
  if (!install_ensure_config_directory(CONFIG_SYNC_DIRECTORY)) {
510
    throw new Exception(t('The directory %directory could not be created or could not be made writable. To proceed with the installation, either create the directory and modify its permissions manually or ensure that the installer has the permissions to create it automatically. For more information, see the <a href=":handbook_url">online handbook</a>.', array(
511
      '%directory' => config_get_config_directory(CONFIG_SYNC_DIRECTORY),
512
      ':handbook_url' => 'https://www.drupal.org/server-permissions',
513
    )));
514
  }
515

516 517 518 519
  // Put a README.txt into the sync config directory. This is required so that
  // they can later be added to git. Since this directory is auto-created, we
  // have to write out the README rather than just adding it to the drupal core
  // repo.
520
  $text = 'This directory contains configuration to be imported into your Drupal site. To make this configuration active, visit admin/config/development/configuration/sync.' . ' For information about deploying configuration between servers, see https://www.drupal.org/documentation/administer/config';
521
  file_put_contents(config_get_config_directory(CONFIG_SYNC_DIRECTORY) . '/README.txt', $text);
522 523 524 525
}

/**
 * Ensures that the config directory exists and is writable, or can be made so.
526 527
 *
 * @param string $type
528
 *   Type of config directory to return. Drupal core provides 'sync'.
529 530 531
 *
 * @return bool
 *   TRUE if the config directory exists and is writable.
532
 */
533
function install_ensure_config_directory($type) {
534
  // The config directory must be defined in settings.php.
535 536
  global $config_directories;
  if (!isset($config_directories[$type])) {
537 538 539 540 541
    return FALSE;
  }
  // The logic here is similar to that used by system_requirements() for other
  // directories that the installer creates.
  else {
542
    $config_directory = config_get_config_directory($type);
543
    return file_prepare_directory($config_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
544 545 546
  }
}

547
/**
548
 * Verifies that all dependencies are met for a given installation profile.
549
 *
550 551
 * @param $install_state
 *   An array of information about the current installation state.
552
 *
Steven Wittens's avatar
Steven Wittens committed
553 554
 * @return
 *   The list of modules to install.
555
 */
556
function drupal_verify_profile($install_state) {
557
  $profile = $install_state['parameters']['profile'];
558
  $info = $install_state['profile_info'];
559

560
  // Get the list of available modules for the selected installation profile.
561
  $listing = new ExtensionDiscovery(\Drupal::root());
562
  $present_modules = array();
563
  foreach ($listing->scan('module') as $present_module) {
564
    $present_modules[] = $present_module->getName();
565 566
  }

567 568
  // The installation profile is also a module, which needs to be installed
  // after all the other dependencies have been installed.
569
  $present_modules[] = $profile;
570

571
  // Verify that all of the profile's required modules are present.
572
  $missing_modules = array_diff($info['dependencies'], $present_modules);
573 574

  $requirements = array();
575

576 577 578 579 580 581
  if ($missing_modules) {
    $build = [
      '#theme' => 'item_list',
      '#context' => ['list_style' => 'comma-list'],
    ];

582
    foreach ($missing_modules as $module) {
583
      $build['#items'][] = array('#markup' => '<span class="admin-missing">' . Unicode::ucfirst($module) . '</span>');
Steven Wittens's avatar
Steven Wittens committed
584
    }
585 586

    $modules_list = \Drupal::service('renderer')->renderPlain($build);
587
    $requirements['required_modules'] = array(
588 589 590 591
      'title' => t('Required modules'),
      'value' => t('Required modules not found.'),
      'severity' => REQUIREMENT_ERROR,
      'description' => t('The following modules are required but were not found. Move them into the appropriate modules subdirectory, such as <em>/modules</em>. Missing modules: @modules', array('@modules' => $modules_list)),
592
    );
Steven Wittens's avatar
Steven Wittens committed
593
  }
594
  return $requirements;
Steven Wittens's avatar
Steven Wittens committed
595
}
596

597
/**
598
 * Installs the system module.
599 600 601
 *
 * Separated from the installation of other modules so core system
 * functions can be made available while other modules are installed.
602 603 604 605
 *
 * @param array $install_state
 *   An array of information about the current installation state. This is used
 *   to set the default language.
606
 */
607
function drupal_install_system($install_state) {
608
  // Remove the service provider of the early installer.
609
  unset($GLOBALS['conf']['container_service_providers']['InstallerServiceProvider']);
610

611 612 613 614 615 616 617 618
  $request = \Drupal::request();
  // Reboot into a full production environment to continue the installation.
  /** @var \Drupal\Core\Installer\InstallerKernel $kernel */
  $kernel = \Drupal::service('kernel');
  $kernel->shutdown();
  // Have installer rebuild from the disk, rather then building from scratch.
  $kernel->rebuildContainer(FALSE);
  $kernel->prepareLegacyRequest($request);
619

620 621
  // Install base system configuration.
  \Drupal::service('config.installer')->installDefaultConfig('core', 'core');
622

623
  // Install System module and rebuild the newly available routes.
624
  $kernel->getContainer()->get('module_installer')->install(array('system'), FALSE);
625
  \Drupal::service('router.builder')->rebuild();
626

627 628
  // Ensure default language is saved.
  if (isset($install_state['parameters']['langcode'])) {
629
    \Drupal::configFactory()->getEditable('system.site')
630 631 632
      ->set('langcode', (string) $install_state['parameters']['langcode'])
      ->set('default_langcode', (string) $install_state['parameters']['langcode'])
      ->save(TRUE);
633
  }
634 635
}

636
/**
637
 * Verifies the state of the specified file.
638 639 640 641 642 643 644
 *
 * @param $file
 *   The file to check for.
 * @param $mask
 *   An optional bitmask created from various FILE_* constants.
 * @param $type
 *   The type of file. Can be file (default), dir, or link.
645
 *
646
 * @return
647
 *   TRUE on success or FALSE on failure. A message is set for the latter.
648 649 650 651 652 653 654 655 656
 */
function drupal_verify_install_file($file, $mask = NULL, $type = 'file') {
  $return = TRUE;
  // Check for files that shouldn't be there.
  if (isset($mask) && ($mask & FILE_NOT_EXIST) && file_exists($file)) {
    return FALSE;
  }
  // Verify that the file is the type of file it is supposed to be.
  if (isset($type) && file_exists($file)) {
657
    $check = 'is_' . $type;
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
    if (!function_exists($check) || !$check($file)) {
      $return = FALSE;
    }
  }

  // Verify file permissions.
  if (isset($mask)) {
    $masks = array(FILE_EXIST, FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
    foreach ($masks as $current_mask) {
      if ($mask & $current_mask) {
        switch ($current_mask) {
          case FILE_EXIST:
            if (!file_exists($file)) {
              if ($type == 'dir') {
                drupal_install_mkdir($file, $mask);
              }
              if (!file_exists($file)) {
                $return = FALSE;
              }
            }
            break;
          case FILE_READABLE:
            if (!is_readable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_WRITABLE:
            if (!is_writable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_EXECUTABLE:
            if (!is_executable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_NOT_READABLE:
            if (is_readable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_NOT_WRITABLE:
            if (is_writable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
          case FILE_NOT_EXECUTABLE:
            if (is_executable($file) && !drupal_install_fix_file($file, $mask)) {
              $return = FALSE;
            }
            break;
        }
      }
    }
  }
  return $return;
}

/**
717
 * Creates a directory with the specified permissions.
718
 *
719
 * @param $file
720
 *   The name of the directory to create;
721
 * @param $mask
722
 *   The permissions of the directory to create.
723
 * @param $message
724
 *   (optional) Whether to output messages. Defaults to TRUE.
725
 *
726 727 728 729 730 731 732 733 734 735
 * @return
 *  TRUE/FALSE whether or not the directory was successfully created.
 */
function drupal_install_mkdir($file, $mask, $message = TRUE) {
  $mod = 0;
  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
  foreach ($masks as $m) {
    if ($mask & $m) {
      switch ($m) {
        case FILE_READABLE:
736
          $mod |= 0444;
737 738
          break;
        case FILE_WRITABLE:
739
          $mod |= 0222;
740 741
          break;
        case FILE_EXECUTABLE:
742
          $mod |= 0111;
743 744 745 746 747
          break;
      }
    }
  }

748
  if (@drupal_mkdir($file, $mod)) {
749 750 751 752 753 754 755 756
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
757
 * Attempts to fix file permissions.
758
 *
759 760 761 762 763 764 765 766 767
 * The general approach here is that, because we do not know the security
 * setup of the webserver, we apply our permission changes to all three
 * digits of the file permission (i.e. user, group and all).
 *
 * To ensure that the values behave as expected (and numbers don't carry
 * from one digit to the next) we do the calculation on the octal value
 * using bitwise operations. This lets us remove, for example, 0222 from
 * 0700 and get the correct value of 0500.
 *
768
 * @param $file
769
 *   The name of the file with permissions to fix.
770
 * @param $mask
771
 *   The desired permissions for the file.
772
 * @param $message
773
 *   (optional) Whether to output messages. Defaults to TRUE.
774
 *
775 776 777 778
 * @return
 *  TRUE/FALSE whether or not we were able to fix the file's permissions.
 */
function drupal_install_fix_file($file, $mask, $message = TRUE) {
779 780 781 782 783
  // If $file does not exist, fileperms() issues a PHP warning.
  if (!file_exists($file)) {
    return FALSE;
  }

784
  $mod = fileperms($file) & 0777;
785
  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
786 787 788 789 790

  // FILE_READABLE, FILE_WRITABLE, and FILE_EXECUTABLE permission strings
  // can theoretically be 0400, 0200, and 0100 respectively, but to be safe
  // we set all three access types in case the administrator intends to
  // change the owner of settings.php after installation.
791 792 793 794 795
  foreach ($masks as $m) {
    if ($mask & $m) {
      switch ($m) {
        case FILE_READABLE:
          if (!is_readable($file)) {
796
            $mod |= 0444;
797 798 799 800
          }
          break;
        case FILE_WRITABLE:
          if (!is_writable($file)) {
801
            $mod |= 0222;
802 803 804 805
          }
          break;
        case FILE_EXECUTABLE:
          if (!is_executable($file)) {
806
            $mod |= 0111;
807 808 809 810
          }
          break;
        case FILE_NOT_READABLE:
          if (is_readable($file)) {
811
            $mod &= ~0444;
812 813 814 815
          }
          break;
        case FILE_NOT_WRITABLE:
          if (is_writable($file)) {
816
            $mod &= ~0222;
817 818 819 820
          }
          break;
        case FILE_NOT_EXECUTABLE:
          if (is_executable($file)) {
821
            $mod &= ~0111;
822 823 824 825 826 827
          }
          break;
      }
    }
  }

828 829
  // chmod() will work if the web server is running as owner of the file.
  if (@chmod($file, $mod)) {
830 831 832 833 834 835 836
    return TRUE;
  }
  else {
    return FALSE;
  }
}

837
/**
838
 * Sends the user to a different installer page.
839 840
 *
 * This issues an on-site HTTP redirect. Messages (and errors) are erased.
841 842 843 844 845
 *
 * @param $path
 *   An installer path.
 */
function install_goto($path) {
846
  global $base_url;
847 848 849 850 851 852
  $headers = array(
    // Not a permanent redirect.
    'Cache-Control' => 'no-cache',
  );
  $response = new RedirectResponse($base_url . '/' . $path, 302, $headers);
  $response->send();
853 854
}

855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
/**
 * Returns the URL of the current script, with modified query parameters.
 *
 * This function can be called by low-level scripts (such as install.php and
 * update.php) and returns the URL of the current script. Existing query
 * parameters are preserved by default, but new ones can optionally be merged
 * in.
 *
 * This function is used when the script must maintain certain query parameters
 * over multiple page requests in order to work correctly. In such cases (for
 * example, update.php, which requires the 'continue=1' parameter to remain in
 * the URL throughout the update process if there are any requirement warnings
 * that need to be bypassed), using this function to generate the URL for links
 * to the next steps of the script ensures that the links will work correctly.
 *
 * @param $query
 *   (optional) An array of query parameters to merge in to the existing ones.
 *
 * @return
 *   The URL of the current script, with query parameters modified by the
 *   passed-in $query. The URL is not sanitized, so it still needs to be run
876 877
 *   through \Drupal\Component\Utility\UrlHelper::filterBadProtocol() if it will be
 *   used as an HTML attribute value.
878 879
 *
 * @see drupal_requirements_url()
880
 * @see Drupal\Component\Utility\UrlHelper::filterBadProtocol()
881 882 883
 */
function drupal_current_script_url($query = array()) {
  $uri = $_SERVER['SCRIPT_NAME'];
884
  $query = array_merge(UrlHelper::filterQueryParameters(\Drupal::request()->query->all()), $query);
885
  if (!empty($query)) {
886
    $uri .= '?' . UrlHelper::buildQuery($query);
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
  }
  return $uri;
}

/**
 * Returns a URL for proceeding to the next page after a requirements problem.
 *
 * This function can be called by low-level scripts (such as install.php and
 * update.php) and returns a URL that can be used to attempt to proceed to the
 * next step of the script.
 *
 * @param $severity
 *   The severity of the requirements problem, as returned by
 *   drupal_requirements_severity().
 *
 * @return
 *   A URL for attempting to proceed to the next step of the script. The URL is
904 905 906
 *   not sanitized, so it still needs to be run through
 *   \Drupal\Component\Utility\UrlHelper::filterBadProtocol() if it will be used
 *   as an HTML attribute value.
907 908
 *
 * @see drupal_current_script_url()
909
 * @see \Drupal\Component\Utility\UrlHelper::filterBadProtocol()
910 911 912 913 914 915 916 917 918 919 920
 */
function drupal_requirements_url($severity) {
  $query = array();
  // If there are no errors, only warnings, append 'continue=1' to the URL so
  // the user can bypass this screen on the next page load.
  if ($severity == REQUIREMENT_WARNING) {
    $query['continue'] = 1;
  }
  return drupal_current_script_url($query);
}

921
/**
922
 * Checks an installation profile's requirements.
923
 *
924
 * @param string $profile
925
 *   Name of installation profile to check.
926 927
 *
 * @return array
928
 *   Array of the installation profile's requirements.
929
 */
930
function drupal_check_profile($profile) {
931
  $info = install_profile_info($profile);
932

933
  // Collect requirement testing results.
934
  $requirements = array();
935 936 937 938 939 940

  // Performs an ExtensionDiscovery scan as the system module is unavailable and
  // we don't yet know where all the modules are located.
  // @todo Remove as part of https://www.drupal.org/node/2186491
  $listing = new ExtensionDiscovery(\Drupal::root());
  $module_list = $listing->scan('module');
941
  foreach ($info['dependencies'] as $module) {
942 943 944 945
    $file = \Drupal::root() . '/' . $module_list[$module]->getPath() . "/$module.install";
    if (is_file($file)) {
      require_once $file;
    }
946
    $function = $module . '_requirements';
947

948
    drupal_classloader_register($module, $module_list[$module]->getPath());
949 950
    if (function_exists($function)) {
      $requirements = array_merge($requirements, $function('install'));
951
    }
952 953 954 955 956
  }
  return $requirements;
}

/**
957
 * Extracts the highest severity from the requirements array.
958 959
 *
 * @param $requirements
960
 *   An array of requirements, in the same format as is returned by
961
 *   hook_requirements().
962
 *
963 964
 * @return
 *   The highest severity in the array.
965 966 967 968 969 970 971 972 973 974 975 976
 */
function drupal_requirements_severity(&$requirements) {
  $severity = REQUIREMENT_OK;
  foreach ($requirements as $requirement) {
    if (isset($requirement['severity'])) {
      $severity = max($severity, $requirement['severity']);
    }
  }
  return $severity;
}

/**
977
 * Checks a module's requirements.
978 979 980
 *
 * @param $module
 *   Machine name of module to check.
981
 *
982
 * @return
983
 *   TRUE or FALSE, depending on whether the requirements are met.
984 985
 */
function drupal_check_module($module) {
986
  module_load_install($module);
987
  // Check requirements
988
  $requirements = \Drupal::moduleHandler()->invoke($module, 'requirements', array('install'));
989 990 991 992
  if (is_array($requirements) && drupal_requirements_severity($requirements) == REQUIREMENT_ERROR) {
    // Print any error messages
    foreach ($requirements as $requirement) {
      if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
993
        $message = $requirement['description'];