install.inc 21.9 KB
Newer Older
1
2
3
<?php
// $Id$

4
5
define('SCHEMA_UNINSTALLED', -1);
define('SCHEMA_INSTALLED', 0);
6

Steven Wittens's avatar
Steven Wittens committed
7
define('REQUIREMENT_INFO', -1);
8
9
10
define('REQUIREMENT_OK', 0);
define('REQUIREMENT_WARNING', 1);
define('REQUIREMENT_ERROR', 2);
11

12
13
14
15
16
17
18
19
define('FILE_EXIST',          1);
define('FILE_READABLE',       2);
define('FILE_WRITABLE',       4);
define('FILE_EXECUTABLE',     8);
define('FILE_NOT_EXIST',      16);
define('FILE_NOT_READABLE',   32);
define('FILE_NOT_WRITABLE',   64);
define('FILE_NOT_EXECUTABLE', 128);
20

21
22
23
24
/**
 * Initialize the update system by loading all installed module's .install files.
 */
function drupal_load_updates() {
25
26
27
28
  foreach (drupal_get_installed_schema_version(NULL, FALSE, TRUE) as $module => $schema_version) {
    if ($schema_version > -1) {
      module_load_install($module);
    }
29
30
31
32
  }
}

/**
33
 * Returns an array of available schema versions for a module.
34
35
36
37
38
39
40
41
 *
 * @param $module
 *   A module name.
 * @return
 *   If the module has updates, an array of available updates. Otherwise,
 *   FALSE.
 */
function drupal_get_schema_versions($module) {
42
  $updates = array();
43
44
  $functions = get_defined_functions();
  foreach ($functions['user'] as $function) {
45
46
47
48
49
    if (strpos($function, $module .'_update_') === 0) {
      $version = substr($function, strlen($module .'_update_'));
      if (is_numeric($version)) {
        $updates[] = $version;
      }
50
    }
51
  }
52
53
  if (count($updates) == 0) {
    return FALSE;
54
  }
55
  return $updates;
56
57
58
59
60
61
62
}

/**
 * Returns the currently installed schema version for a module.
 *
 * @param $module
 *   A module name.
63
64
65
 * @param $reset
 *   Set to TRUE after modifying the system table.
 * @param $array
66
 *   Set to TRUE if you want to get information about all modules in the
67
 *   system.
68
69
70
 * @return
 *   The currently installed schema version.
 */
71
function drupal_get_installed_schema_version($module, $reset = FALSE, $array = FALSE) {
72
  static $versions = array();
73
74

  if ($reset) {
75
    $versions = array();
76
77
78
79
  }

  if (!$versions) {
    $versions = array();
80
    $result = db_query("SELECT name, schema_version FROM {system} WHERE type = '%s'", 'module');
81
82
83
84
85
    while ($row = db_fetch_object($result)) {
      $versions[$row->name] = $row->schema_version;
    }
  }

86
  return $array ? $versions : $versions[$module];
87
88
89
90
91
92
93
94
95
96
97
98
99
}

/**
 * Update the installed version information for a module.
 *
 * @param $module
 *   A module name.
 * @param $version
 *   The new schema version.
 */
function drupal_set_installed_schema_version($module, $version) {
  db_query("UPDATE {system} SET schema_version = %d WHERE name = '%s'", $version, $module);
}
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

/**
 * Loads the profile definition, extracting the profile's defined name.
 *
 * @return
 *   The name defined in the profile's _profile_details() hook.
 */
function drupal_install_profile_name() {
  global $profile;
  static $name = NULL;

  if (!isset($name)) {
    // Load profile details.
    $function = $profile .'_profile_details';
    if (function_exists($function)) {
      $details = $function();
    }
    $name = isset($details['name']) ? $details['name'] : 'Drupal';
  }

  return $name;
}

/**
 * Auto detect the base_url with PHP predefined variables.
 *
 * @param $file
 *   The name of the file calling this function so we can strip it out of
 *   the URI when generating the base_url.
 *
 * @return
 *   The auto-detected $base_url that should be configured in settings.php
 */
function drupal_detect_baseurl($file = 'install.php') {
  global $profile;
  $proto = $_SERVER['HTTPS'] ? 'https://' : 'http://';
  $host = $_SERVER['SERVER_NAME'];
  $port = ($_SERVER['SERVER_PORT'] == 80 ? '' : ':'. $_SERVER['SERVER_PORT']);
138
  $uri = preg_replace("/\?.*/", '', $_SERVER['REQUEST_URI']);
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
  $dir = str_replace("/$file", '', $uri);

  return "$proto$host$port$dir";
}

/**
 * Detect all databases supported by Drupal that are compiled into the current
 * PHP installation.
 *
 * @return
 *  An array of database types compiled into PHP.
 */
function drupal_detect_database_types() {
  $databases = array();

  foreach (array('mysql', 'mysqli', 'pgsql') as $type) {
    if (file_exists('./includes/install.'. $type .'.inc')) {
      include_once './includes/install.'. $type .'.inc';
      $function = $type .'_is_available';
      if ($function()) {
        $databases[$type] = $type;
      }
    }
  }

  return $databases;
}

/**
 * Read settings.php into a buffer line by line, changing values specified in
 * $settings array, then over-writing the old settings.php file.
 *
 * @param $settings
 *   An array of settings that need to be updated.
 */
function drupal_rewrite_settings($settings = array(), $prefix = '') {
175
  $default_settings = './sites/default/default.settings.php';
176
  $settings_file = './'. conf_path(FALSE, TRUE) .'/'. $prefix .'settings.php';
177
178
179
180
181
182
183
184
185
186

  // Build list of setting names and insert the values into the global namespace.
  $keys = array();
  foreach ($settings as $setting => $data) {
    $GLOBALS[$setting] = $data['value'];
    $keys[] = $setting;
  }

  $buffer = NULL;
  $first = TRUE;
187
  if ($fp = fopen($default_settings, 'r')) {
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
    // Step line by line through settings.php.
    while (!feof($fp)) {
      $line = fgets($fp);
      if ($first && substr($line, 0, 5) != '<?php') {
        $buffer = "<?php\n\n";
      }
      $first = FALSE;
      // Check for constants.
      if (substr($line, 0, 7) == 'define(') {
        preg_match('/define\(\s*[\'"]([A-Z_-]+)[\'"]\s*,(.*?)\);/', $line, $variable);
        if (in_array($variable[1], $keys)) {
          $setting = $settings[$variable[1]];
          $buffer .= str_replace($variable[2], " '". $setting['value'] ."'", $line);
          unset($settings[$variable[1]]);
          unset($settings[$variable[2]]);
        }
        else {
          $buffer .= $line;
        }
      }
      // Check for variables.
      elseif (substr($line, 0, 1) == '$') {
        preg_match('/\$([^ ]*) /', $line, $variable);
        if (in_array($variable[1], $keys)) {
          // Write new value to settings.php in the following format:
          //    $'setting' = 'value'; // 'comment'
          $setting = $settings[$variable[1]];
215
          $buffer .= '$'. $variable[1] ." = '". $setting['value'] ."';". (!empty($setting['comment']) ? ' // '. $setting['comment'] ."\n" : "\n");
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
          unset($settings[$variable[1]]);
        }
        else {
          $buffer .= $line;
        }
      }
      else {
        $buffer .= $line;
      }
    }
    fclose($fp);

    // Add required settings that were missing from settings.php.
    foreach ($settings as $setting => $data) {
      if ($data['required']) {
        $buffer .= "\$$setting = '". $data['value'] ."';\n";
      }
    }

    $fp = fopen($settings_file, 'w');
    if ($fp && fwrite($fp, $buffer) === FALSE) {
237
      drupal_set_message(st('Failed to modify %settings, please verify the file permissions.', array('%settings' => $settings_file)), 'error');
238
239
240
    }
  }
  else {
241
    drupal_set_message(st('Failed to open %settings, please verify the file permissions.', array('%settings' => $default_settings)), 'error');
242
243
244
245
246
247
248
249
250
251
252
253
  }
}

/**
 * Get list of all .install files.
 *
 * @param $module_list
 *   An array of modules to search for their .install files.
 */
function drupal_get_install_files($module_list = array()) {
  $installs = array();
  foreach ($module_list as $module) {
254
    $installs = array_merge($installs, drupal_system_listing($module .'.install$', 'modules'));
255
256
257
258
259
  }
  return $installs;
}

/**
Steven Wittens's avatar
Steven Wittens committed
260
 * Verify a profile for installation.
261
262
 *
 * @param profile
Steven Wittens's avatar
Steven Wittens committed
263
 *   Name of profile to verify.
drumm's avatar
drumm committed
264
265
 * @param locale
 *   Name of locale used (if any).
Steven Wittens's avatar
Steven Wittens committed
266
267
 * @return
 *   The list of modules to install.
268
 */
drumm's avatar
drumm committed
269
function drupal_verify_profile($profile, $locale) {
270
  include_once './includes/file.inc';
271
  include_once './includes/common.inc';
272

273
  $profile_file = "./profiles/$profile/$profile.profile";
274
275

  if (!isset($profile) || !file_exists($profile_file)) {
276
    install_no_profile_error();
277
278
279
280
281
282
  }

  require_once($profile_file);

  // Get a list of modules required by this profile.
  $function = $profile .'_profile_modules';
283
  $module_list = array_merge(drupal_required_modules(), $function(), ($locale != 'en' ? array('locale') : array()));
284

285
286
  // Get a list of modules that exist in Drupal's assorted subdirectories.
  $present_modules = array();
287
  foreach (drupal_system_listing('\.module$', 'modules', 'name', 0) as $present_module) {
288
289
290
291
292
293
    $present_modules[] = $present_module->name;
  }

  // Verify that all of the profile's required modules are present.
  $missing_modules = array_diff($module_list, $present_modules);
  if (count($missing_modules)) {
294
    foreach ($missing_modules as $module) {
Steven Wittens's avatar
Steven Wittens committed
295
296
297
      drupal_set_message(st('The %module module is required but was not found. Please move it into the <em>modules</em> subdirectory.', array('%module' => $module)), 'error');
    }
  }
298
299
300
  else {
    return $module_list;
  }
Steven Wittens's avatar
Steven Wittens committed
301
}
302

Steven Wittens's avatar
Steven Wittens committed
303
/**
304
305
 * Calls the install function and updates the system table for a given list of
 * modules.
Steven Wittens's avatar
Steven Wittens committed
306
307
 *
 * @param module_list
308
309
310
 *   The modules to install.
 */
function drupal_install_modules($module_list = array()) {
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
  $files = module_rebuild_cache();
  $module_list = array_flip(array_values($module_list));
  do {
    $moved = FALSE;
    foreach ($module_list as $module => $weight) {
      $file = $files[$module];
      if (isset($file->info['dependencies']) && is_array($file->info['dependencies'])) {
        foreach ($file->info['dependencies'] as $dependency) {
          if (isset($module_list[$dependency]) && $module_list[$module] < $module_list[$dependency] +1) {
            $module_list[$module] = $module_list[$dependency] +1;
            $moved = TRUE;
          }
        }
      }
    }
  } while ($moved);
  asort($module_list);
  $module_list = array_keys($module_list);
329
330
331
332
333
334
335
336
337
338
  array_filter($module_list, '_drupal_install_module');
  module_enable($module_list);
}

/**
 * Callback to install an individual profile module.
 *
 * Used during installation to install modules one at a time and then
 * enable them, or to install a number of modules at one time
 * from admin/build/modules.
Steven Wittens's avatar
Steven Wittens committed
339
 */
340
341
342
343
344
345
346
347
348
function _drupal_install_module($module) {
  if (drupal_get_installed_schema_version($module, TRUE) == SCHEMA_UNINSTALLED) {
    module_load_install($module);
    module_invoke($module, 'install');
    $versions = drupal_get_schema_versions($module);
    drupal_set_installed_schema_version($module, $versions ? max($versions) : SCHEMA_INSTALLED);
    return TRUE;
  }
}
Steven Wittens's avatar
Steven Wittens committed
349

350
351
352
353
354
355
356
/**
 * Callback to install the system module.
 *
 * Separated from the installation of other modules so core system
 * functions can be made available while other modules are installed.
 */
function drupal_install_system() {
Dries's avatar
Dries committed
357
  $system_path = dirname(drupal_get_filename('module', 'system', NULL));
358
  require_once './'. $system_path .'/system.install';
Steven Wittens's avatar
Steven Wittens committed
359
360
361
  module_invoke('system', 'install');
  $system_versions = drupal_get_schema_versions('system');
  $system_version = $system_versions ? max($system_versions) : SCHEMA_INSTALLED;
362
  db_query("INSERT INTO {system} (filename, name, type, owner, status, throttle, bootstrap, schema_version) VALUES('%s', '%s', '%s', '%s', %d, %d, %d, %d)", $system_path .'/system.module', 'system', 'module', '', 1, 0, 0, $system_version);
Steven Wittens's avatar
Steven Wittens committed
363
  // Now that we've installed things properly, bootstrap the full Drupal environment
364
  drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
Steven Wittens's avatar
Steven Wittens committed
365
  module_rebuild_cache();
366
367
}

368

369
370
371
372
373
374
375
/**
 * Calls the uninstall function and updates the system table for a given module.
 *
 * @param $module
 *   The module to uninstall.
 */
function drupal_uninstall_module($module) {
376
377
378
379
380
  // First, retrieve all the module's menu paths from db.
  drupal_load('module', $module);
  $paths = module_invoke($module, 'menu');

  // Uninstall the module(s).
381
382
  module_load_install($module);
  module_invoke($module, 'uninstall');
Dries's avatar
Dries committed
383

384
  // Now remove the menu links for all paths declared by this module.
385
386
387
  if (!empty($paths)) {
    $paths = array_keys($paths);
    // Clean out the names of load functions.
388
    foreach ($paths as $index => $path) {
389
390
391
392
393
394
395
396
397
      $parts = explode('/', $path, MENU_MAX_PARTS);
      foreach ($parts as $k => $part) {
        if (preg_match('/^%[a-z_]*$/', $part)) {
          $parts[$k] = '%';
        }
      }
      $paths[$index] = implode('/', $parts);
    }
    $placeholders = implode(', ', array_fill(0, count($paths), "'%s'"));
Dries's avatar
Dries committed
398

399
400
401
402
403
404
405
406
    $result = db_query('SELECT * FROM {menu_links} WHERE router_path IN ('. $placeholders .') AND external = 0 ORDER BY depth DESC', $paths);
    // Remove all such items. Starting from those with the greatest depth will
    // minimize the amount of re-parenting done by menu_link_delete().
    while ($item = db_fetch_array($result)) {
      _menu_delete_item($item, TRUE);
    }
  }

407
408
409
  drupal_set_installed_schema_version($module, SCHEMA_UNINSTALLED);
}

410
411
412
413
414
415
416
417
418
419
/**
 * Verify the state of the specified file.
 *
 * @param $file
 *   The file to check for.
 * @param $mask
 *   An optional bitmask created from various FILE_* constants.
 * @param $type
 *   The type of file. Can be file (default), dir, or link.
 * @return
420
 *   TRUE on success or FALSE on failure. A message is set for the latter.
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
 */
function drupal_verify_install_file($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)) {
    $check = 'is_'. $type;
    if (!function_exists($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;
}

/**
 * Create a directory with specified permissions.
 *
 * @param file
 *  The name of the directory to create;
 * @param mask
 *  The permissions of the directory to create.
 * @param $message
 *  (optional) Whether to output messages. Defaults to TRUE.
 *
 * @return
 *  TRUE/FALSE whether or not the directory was successfully created.
 */
function drupal_install_mkdir($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:
          $mod += 444;
          break;
        case FILE_WRITABLE:
          $mod += 222;
          break;
        case FILE_EXECUTABLE:
          $mod += 111;
          break;
      }
    }
  }

  if (@mkdir($file, intval("0$mod", 8))) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
 * Attempt to fix file permissions.
 *
532
533
534
535
536
537
538
539
540
 * 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.
 *
541
542
543
544
545
546
547
548
549
550
551
 * @param $file
 *  The name of the file with permissions to fix.
 * @param $mask
 *  The desired permissions for the file.
 * @param $message
 *  (optional) Whether to output messages. Defaults to TRUE.
 *
 * @return
 *  TRUE/FALSE whether or not we were able to fix the file's permissions.
 */
function drupal_install_fix_file($file, $mask, $message = TRUE) {
552
  $mod = fileperms($file) & 0777;
553
  $masks = array(FILE_READABLE, FILE_WRITABLE, FILE_EXECUTABLE, FILE_NOT_READABLE, FILE_NOT_WRITABLE, FILE_NOT_EXECUTABLE);
554
555
556
557
558

  // 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.
559
560
561
562
563
  foreach ($masks as $m) {
    if ($mask & $m) {
      switch ($m) {
        case FILE_READABLE:
          if (!is_readable($file)) {
564
            $mod |= 0444;
565
566
567
568
          }
          break;
        case FILE_WRITABLE:
          if (!is_writable($file)) {
569
            $mod |= 0222;
570
571
572
573
          }
          break;
        case FILE_EXECUTABLE:
          if (!is_executable($file)) {
574
            $mod |= 0111;
575
576
577
578
          }
          break;
        case FILE_NOT_READABLE:
          if (is_readable($file)) {
579
            $mod &= ~0444;
580
581
582
583
          }
          break;
        case FILE_NOT_WRITABLE:
          if (is_writable($file)) {
584
            $mod &= ~0222;
585
586
587
588
          }
          break;
        case FILE_NOT_EXECUTABLE:
          if (is_executable($file)) {
589
            $mod &= ~0111;
590
591
592
593
594
595
          }
          break;
      }
    }
  }

596
597
598
599
  // chmod() will work if the web server is running as owner of the file.
  // If PHP safe_mode is enabled the currently executing script must also
  // have the same owner.
  if (@chmod($file, $mod)) {
600
601
602
603
604
605
606
    return TRUE;
  }
  else {
    return FALSE;
  }
}

607
608
609
610
611
612
613
614
615

/**
 * Send the user to a different installer page. This issues an on-site HTTP
 * redirect. Messages (and errors) are erased.
 *
 * @param $path
 *   An installer path.
 */
function install_goto($path) {
616
  global $base_url;
617
  header('Location: '. $base_url .'/'. $path);
618
  header('Cache-Control: no-cache'); // Not a permanent redirect.
619
620
621
  exit();
}

622
/**
623
624
625
 * Hardcoded function for doing the equivalent of t() during
 * the install process, when database, theme, and localization
 * system is possibly not yet available.
626
627
 */
function st($string, $args = array()) {
drumm's avatar
drumm committed
628
629
630
631
632
  static $locale_strings = NULL;
  global $profile, $install_locale;

  if (!isset($locale_strings)) {
    $locale_strings = array();
633
    $filename = './profiles/'. $profile .'/translations/'. $install_locale .'.po';
drumm's avatar
drumm committed
634
635
636
637
638
639
640
641
    if (file_exists($filename)) {
      require_once './includes/locale.inc';
      $file = (object) array('filepath' => $filename);
      _locale_import_read_po('mem-store', $file);
      $locale_strings = _locale_import_one_string('mem-report');
    }
  }

642
  require_once './includes/theme.inc';
643
  // Transform arguments before inserting them
644
  foreach ($args as $key => $value) {
645
646
647
648
649
650
651
652
653
654
655
656
657
    switch ($key[0]) {
      // Escaped only
      case '@':
        $args[$key] = check_plain($value);
        break;
      // Escaped and placeholder
      case '%':
      default:
        $args[$key] = '<em>'. check_plain($value) .'</em>';
        break;
      // Pass-through
      case '!':
    }
658
  }
659
  return strtr((!empty($locale_strings[$string]) ? $locale_strings[$string] : $string), $args);
660
}
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680

/**
 * Check a profile's requirements.
 *
 * @param profile
 *   Name of profile to check.
 */
function drupal_check_profile($profile) {
  include_once './includes/file.inc';

  $profile_file = "./profiles/$profile/$profile.profile";

  if (!isset($profile) || !file_exists($profile_file)) {
    install_no_profile_error();
  }

  require_once($profile_file);

  // Get a list of modules required by this profile.
  $function = $profile .'_profile_modules';
681
  $module_list = array_unique(array_merge(drupal_required_modules(), $function()));
682
683
684
685
686
687
688
689

  // Get a list of all .install files.
  $installs = drupal_get_install_files($module_list);

  // Collect requirement testing results
  $requirements = array();
  foreach ($installs as $install) {
    require_once $install->filename;
690
691
692
    if (module_hook($install->name, 'requirements')) {
      $requirements = array_merge($requirements, module_invoke($install->name, 'requirements', 'install'));
    }
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
  }
  return $requirements;
}

/**
 * Extract highest severity from requirements array.
 */
function drupal_requirements_severity(&$requirements) {
  $severity = REQUIREMENT_OK;
  foreach ($requirements as $requirement) {
    if (isset($requirement['severity'])) {
      $severity = max($severity, $requirement['severity']);
    }
  }
  return $severity;
}

/**
 * Check a module's requirements.
 */
function drupal_check_module($module) {
  // Include install file
  $install = drupal_get_install_files(array($module));
  if (isset($install[$module])) {
    require_once $install[$module]->filename;

    // Check requirements
    $requirements = module_invoke($module, 'requirements', 'install');
    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) {
725
726
727
728
729
          $message = $requirement['description'];
          if (isset($requirement['value']) && $requirement['value']) {
            $message .= ' ('. t('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) .')';
          }
          drupal_set_message($message, 'error');
730
731
732
733
734
735
736
        }
      }
      return FALSE;
    }
  }
  return TRUE;
}