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   1  <?php
   2  
   3  /**
   4   * Test and report Drupal installation requirements.
   5   *
   6   * @param $phase
   7   *   The current system installation phase.
   8   * @return
   9   *   An array of system requirements.
  10   */
  11  function system_requirements($phase) {
  12    $requirements = array();
  13    // Ensure translations don't break at install time
  14    $t = get_t();
  15  
  16    // Report Drupal version
  17    if ($phase == 'runtime') {
  18      $requirements['drupal'] = array(
  19        'title' => $t('Drupal'),
  20        'value' => VERSION,
  21        'severity' => REQUIREMENT_INFO,
  22        'weight' => -10,
  23      );
  24    }
  25  
  26    // Web server information.
  27    $software = $_SERVER['SERVER_SOFTWARE'];
  28    $requirements['webserver'] = array(
  29      'title' => $t('Web server'),
  30      'value' => $software,
  31    );
  32  
  33    // Test PHP version
  34    $requirements['php'] = array(
  35      'title' => $t('PHP'),
  36      'value' => ($phase == 'runtime') ? l(phpversion(), 'admin/reports/status/php') : phpversion(),
  37    );
  38    if (version_compare(phpversion(), DRUPAL_MINIMUM_PHP) < 0) {
  39      $requirements['php']['description'] = $t('Your PHP installation is too old. Drupal requires at least PHP %version.', array('%version' => DRUPAL_MINIMUM_PHP));
  40      $requirements['php']['severity'] = REQUIREMENT_ERROR;
  41    }
  42  
  43    // Test PHP register_globals setting.
  44    $requirements['php_register_globals'] = array(
  45      'title' => $t('PHP register globals'),
  46    );
  47    $register_globals = trim(ini_get('register_globals'));
  48    // Unfortunately, ini_get() may return many different values, and we can't
  49    // be certain which values mean 'on', so we instead check for 'not off'
  50    // since we never want to tell the user that their site is secure
  51    // (register_globals off), when it is in fact on. We can only guarantee
  52    // register_globals is off if the value returned is 'off', '', or 0.
  53    if (!empty($register_globals) && strtolower($register_globals) != 'off') {
  54      $requirements['php_register_globals']['description'] = $t('<em>register_globals</em> is enabled. Drupal requires this configuration directive to be disabled. Your site may not be secure when <em>register_globals</em> is enabled. The PHP manual has instructions for <a href="http://php.net/configuration.changes">how to change configuration settings</a>.');
  55      $requirements['php_register_globals']['severity'] = REQUIREMENT_ERROR;
  56      $requirements['php_register_globals']['value'] = $t("Enabled ('@value')", array('@value' => $register_globals));
  57    }
  58    else {
  59      $requirements['php_register_globals']['value'] = $t('Disabled');
  60    }
  61  
  62    // Test PHP memory_limit
  63    $memory_limit = ini_get('memory_limit');
  64    $requirements['php_memory_limit'] = array(
  65      'title' => $t('PHP memory limit'),
  66      'value' => $memory_limit == -1 ? t('-1 (Unlimited)') : $memory_limit,
  67    );
  68  
  69    if ($memory_limit && $memory_limit != -1 && parse_size($memory_limit) < parse_size(DRUPAL_MINIMUM_PHP_MEMORY_LIMIT)) {
  70      $description = '';
  71      if ($phase == 'install') {
  72        $description = $t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the installation process.', array('%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));
  73      }
  74      elseif ($phase == 'update') {
  75        $description = $t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the update process.', array('%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));
  76      }
  77      elseif ($phase == 'runtime') {
  78        $description = $t('Depending on your configuration, Drupal can run with a %memory_limit PHP memory limit. However, a %memory_minimum_limit PHP memory limit or above is recommended, especially if your site uses additional custom or contributed modules.', array('%memory_limit' => $memory_limit, '%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));
  79      }
  80  
  81      if (!empty($description)) {
  82        if ($php_ini_path = get_cfg_var('cfg_file_path')) {
  83          $description .= ' '. $t('Increase the memory limit by editing the memory_limit parameter in the file %configuration-file and then restart your web server (or contact your system administrator or hosting provider for assistance).', array('%configuration-file' => $php_ini_path));
  84        }
  85        else {
  86          $description .= ' '. $t('Contact your system administrator or hosting provider for assistance with increasing your PHP memory limit.');
  87        }
  88  
  89        $requirements['php_memory_limit']['description'] = $description .' '. $t('See the <a href="@url">Drupal requirements</a> for more information.', array('@url' => 'http://drupal.org/requirements'));
  90        $requirements['php_memory_limit']['severity'] = REQUIREMENT_WARNING;
  91      }
  92    }
  93  
  94    // Test DB version
  95    global $db_type;
  96    if (function_exists('db_status_report')) {
  97      $requirements += db_status_report($phase);
  98    }
  99  
 100    // Test settings.php file writability
 101    if ($phase == 'runtime') {
 102      $conf_dir = drupal_verify_install_file(conf_path(), FILE_NOT_WRITABLE, 'dir');
 103      $conf_file = drupal_verify_install_file(conf_path() .'/settings.php', FILE_EXIST|FILE_READABLE|FILE_NOT_WRITABLE);
 104      if (!$conf_dir || !$conf_file) {
 105        $requirements['settings.php'] = array(
 106          'value' => $t('Not protected'),
 107          'severity' => REQUIREMENT_ERROR,
 108          'description' => '',
 109        );
 110        if (!$conf_dir) {
 111          $requirements['settings.php']['description'] .= $t('The directory %file is not protected from modifications and poses a security risk. You must change the directory\'s permissions to be non-writable. ', array('%file' => conf_path()));
 112        }
 113        if (!$conf_file) {
 114          $requirements['settings.php']['description'] .= $t('The file %file is not protected from modifications and poses a security risk. You must change the file\'s permissions to be non-writable.', array('%file' => conf_path() .'/settings.php'));
 115        }
 116      }
 117      else {
 118        $requirements['settings.php'] = array(
 119          'value' => $t('Protected'),
 120        );
 121      }
 122      $requirements['settings.php']['title'] = $t('Configuration file');
 123    }
 124  
 125    // Report cron status.
 126    if ($phase == 'runtime') {
 127      // Cron warning threshold defaults to two days.
 128      $threshold_warning = variable_get('cron_threshold_warning', 172800);
 129      // Cron error threshold defaults to two weeks.
 130      $threshold_error = variable_get('cron_threshold_error', 1209600);
 131      // Cron configuration help text.
 132      $help = $t('For more information, see the online handbook entry for <a href="@cron-handbook">configuring cron jobs</a>.', array('@cron-handbook' => 'http://drupal.org/cron'));
 133  
 134      // Determine when cron last ran. If never, use the install time to
 135      // determine the warning or error status.
 136      $cron_last = variable_get('cron_last', NULL);
 137      $never_run = FALSE;
 138      if (!is_numeric($cron_last)) {
 139        $never_run = TRUE;
 140        $cron_last = variable_get('install_time', 0);
 141      }
 142  
 143      // Determine severity based on time since cron last ran.
 144      $severity = REQUIREMENT_OK;
 145      if (time() - $cron_last > $threshold_error) {
 146        $severity = REQUIREMENT_ERROR;
 147      }
 148      else if ($never_run || (time() - $cron_last > $threshold_warning)) {
 149        $severity = REQUIREMENT_WARNING;
 150      }
 151  
 152      // If cron hasn't been run, and the user is viewing the main
 153      // administration page, instead of an error, we display a helpful reminder
 154      // to configure cron jobs.
 155      if ($never_run && $severity != REQUIREMENT_ERROR && $_GET['q'] == 'admin' && user_access('administer site configuration')) {
 156        drupal_set_message($t('Cron has not run. Please visit the <a href="@status">status report</a> for more information.', array('@status' => url('admin/reports/status'))));
 157      }
 158  
 159      // Set summary and description based on values determined above.
 160      if ($never_run) {
 161        $summary = $t('Never run');
 162        $description = $t('Cron has not run.') .' '. $help;
 163      }
 164      else {
 165        $summary = $t('Last run !time ago', array('!time' => format_interval(time() - $cron_last)));
 166        $description = '';
 167        if ($severity != REQUIREMENT_OK) {
 168          $description = $t('Cron has not run recently.') .' '. $help;
 169        }
 170      }
 171  
 172      $requirements['cron'] = array(
 173        'title' => $t('Cron maintenance tasks'),
 174        'severity' => $severity,
 175        'value' => $summary,
 176        'description' => $description .' '. $t('You can <a href="@cron">run cron manually</a>.', array('@cron' => url('admin/reports/status/run-cron'))),
 177      );
 178    }
 179  
 180    // Test files directory
 181    $directory = file_directory_path();
 182    $requirements['file system'] = array(
 183      'title' => $t('File system'),
 184    );
 185  
 186    // For installer, create the directory if possible.
 187    if ($phase == 'install' && !is_dir($directory) && @mkdir($directory)) {
 188      @chmod($directory, 0775); // Necessary for non-webserver users.
 189    }
 190  
 191    $is_writable = is_writable($directory);
 192    $is_directory = is_dir($directory);
 193    if (!$is_writable || !$is_directory) {
 194      $description = '';
 195      $requirements['file system']['value'] = $t('Not writable');
 196      if (!$is_directory) {
 197        $error = $t('The directory %directory does not exist.', array('%directory' => $directory));
 198      }
 199      else {
 200        $error = $t('The directory %directory is not writable.', array('%directory' => $directory));
 201      }
 202      // The files directory requirement check is done only during install and runtime.
 203      if ($phase == 'runtime') {
 204        $description = $error .' '. $t('You may need to set the correct directory at the <a href="@admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', array('@admin-file-system' => url('admin/settings/file-system')));
 205      }
 206      elseif ($phase == 'install') {
 207        // For the installer UI, we need different wording. 'value' will
 208        // be treated as version, so provide none there.
 209        $description = $error .' '. $t('An automated attempt to create this directory failed, possibly due to a permissions problem. 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, please see INSTALL.txt or the <a href="@handbook_url">on-line handbook</a>.', array('@handbook_url' => 'http://drupal.org/server-permissions'));
 210        $requirements['file system']['value'] = '';
 211      }
 212      if (!empty($description)) {
 213        $requirements['file system']['description'] = $description;
 214        $requirements['file system']['severity'] = REQUIREMENT_ERROR;
 215      }
 216    }
 217    else {
 218      if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC) {
 219        $requirements['file system']['value'] = $t('Writable (<em>public</em> download method)');
 220      }
 221      else {
 222        $requirements['file system']['value'] = $t('Writable (<em>private</em> download method)');
 223      }
 224    }
 225  
 226    // See if updates are available in update.php.
 227    if ($phase == 'runtime') {
 228      $requirements['update'] = array(
 229        'title' => $t('Database updates'),
 230        'severity' => REQUIREMENT_OK,
 231        'value' => $t('Up to date'),
 232      );
 233  
 234      // Check installed modules.
 235      foreach (module_list() as $module) {
 236        $updates = drupal_get_schema_versions($module);
 237        if ($updates !== FALSE) {
 238          $default = drupal_get_installed_schema_version($module);
 239          if (max($updates) > $default) {
 240            $requirements['update']['severity'] = REQUIREMENT_ERROR;
 241            $requirements['update']['value'] = $t('Out of date');
 242            $requirements['update']['description'] = $t('Some modules have database schema updates to install. You should run the <a href="@update">database update script</a> immediately.', array('@update' => base_path() .'update.php'));
 243            break;
 244          }
 245        }
 246      }
 247    }
 248  
 249    // Verify the update.php access setting
 250    if ($phase == 'runtime') {
 251      if (!empty($GLOBALS['update_free_access'])) {
 252        $requirements['update access'] = array(
 253          'value' => $t('Not protected'),
 254          'severity' => REQUIREMENT_ERROR,
 255          'description' => $t('The update.php script is accessible to everyone without authentication check, which is a security risk. You must change the $update_free_access value in your settings.php back to FALSE.'),
 256        );
 257      }
 258      else {
 259        $requirements['update access'] = array(
 260          'value' => $t('Protected'),
 261        );
 262      }
 263      $requirements['update access']['title'] = $t('Access to update.php');
 264    }
 265  
 266    // Test Unicode library
 267    include_once  './includes/unicode.inc';
 268    $requirements = array_merge($requirements, unicode_requirements());
 269  
 270    if ($phase == 'runtime') {
 271      // Check for update status module.
 272      if (!module_exists('update')) {
 273        $requirements['update status'] = array(
 274          'value' => $t('Not enabled'),
 275          'severity' => REQUIREMENT_WARNING,
 276          'description' => $t('Update notifications are not enabled. It is <strong>highly recommended</strong> that you enable the update status module from the <a href="@module">module administration page</a> in order to stay up-to-date on new releases. For more information please read the <a href="@update">Update status handbook page</a>.', array('@update' => 'http://drupal.org/handbook/modules/update', '@module' => url('admin/build/modules'))),
 277        );
 278      }
 279      else {
 280        $requirements['update status'] = array(
 281          'value' => $t('Enabled'),
 282        );
 283      }
 284      $requirements['update status']['title'] = $t('Update notifications');
 285  
 286      // Check that Drupal can issue HTTP requests.
 287      if (variable_get('drupal_http_request_fails', TRUE) && !system_check_http_request()) {
 288        $requirements['http requests'] = array(
 289          'title' => $t('HTTP request status'),
 290          'value' => $t('Fails'),
 291          'severity' => REQUIREMENT_ERROR,
 292          'description' => $t('Your system or network configuration does not allow Drupal to access web pages, resulting in reduced functionality. This could be due to your webserver configuration or PHP settings, and should be resolved in order to download information about available updates, fetch aggregator feeds, sign in via OpenID, or use other network-dependent services.'),
 293        );
 294      }
 295    }
 296  
 297    return $requirements;
 298  }
 299  
 300  /**
 301   * Implementation of hook_install().
 302   */
 303  function system_install() {
 304    if ($GLOBALS['db_type'] == 'pgsql') {
 305      // We create some custom types and functions using global names instead of
 306      // prefixing them like we do with table names. If this function is ever
 307      // called again (for example, by the test framework when creating prefixed
 308      // test databases), the global names will already exist. We therefore avoid
 309      // trying to create them again in that case.
 310  
 311      // Create unsigned types.
 312      if (!db_result(db_query("SELECT COUNT(*) FROM pg_constraint WHERE conname = 'int_unsigned_check'"))) {
 313        db_query("CREATE DOMAIN int_unsigned integer CHECK (VALUE >= 0)");
 314      }
 315      if (!db_result(db_query("SELECT COUNT(*) FROM pg_constraint WHERE conname = 'smallint_unsigned_check'"))) {
 316        db_query("CREATE DOMAIN smallint_unsigned smallint CHECK (VALUE >= 0)");
 317      }
 318      if (!db_result(db_query("SELECT COUNT(*) FROM pg_constraint WHERE conname = 'bigint_unsigned_check'"))) {
 319        db_query("CREATE DOMAIN bigint_unsigned bigint CHECK (VALUE >= 0)");
 320      }
 321  
 322      // Create functions.
 323      db_query('CREATE OR REPLACE FUNCTION "greatest"(numeric, numeric) RETURNS numeric AS
 324        \'SELECT CASE WHEN (($1 > $2) OR ($2 IS NULL)) THEN $1 ELSE $2 END;\'
 325        LANGUAGE \'sql\''
 326      );
 327      db_query('CREATE OR REPLACE FUNCTION "greatest"(numeric, numeric, numeric) RETURNS numeric AS
 328        \'SELECT greatest($1, greatest($2, $3));\'
 329        LANGUAGE \'sql\''
 330      );
 331      if (!db_result(db_query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'rand'"))) {
 332        db_query('CREATE OR REPLACE FUNCTION "rand"() RETURNS float AS
 333          \'SELECT random();\'
 334          LANGUAGE \'sql\''
 335        );
 336      }
 337  
 338      if (!db_result(db_query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'concat'"))) {
 339        db_query('CREATE OR REPLACE FUNCTION "concat"(text, text) RETURNS text AS
 340          \'SELECT $1 || $2;\'
 341          LANGUAGE \'sql\''
 342        );
 343      }
 344      db_query('CREATE OR REPLACE FUNCTION "if"(boolean, text, text) RETURNS text AS
 345        \'SELECT CASE WHEN $1 THEN $2 ELSE $3 END;\'
 346        LANGUAGE \'sql\''
 347      );
 348      db_query('CREATE OR REPLACE FUNCTION "if"(boolean, integer, integer) RETURNS integer AS
 349        \'SELECT CASE WHEN $1 THEN $2 ELSE $3 END;\'
 350        LANGUAGE \'sql\''
 351      );
 352    }
 353  
 354    // Create tables.
 355    $modules = array('system', 'filter', 'block', 'user', 'node', 'comment', 'taxonomy');
 356    foreach ($modules as $module) {
 357      drupal_install_schema($module);
 358    }
 359  
 360    // Clear out module list and hook implementation statics before calling
 361    // system_theme_data().
 362    module_list(TRUE, FALSE);
 363    module_implements('', FALSE, TRUE);
 364  
 365    // Load system theme data appropriately.
 366    system_theme_data();
 367  
 368    // Inserting uid 0 here confuses MySQL -- the next user might be created as
 369    // uid 2 which is not what we want. So we insert the first user here, the
 370    // anonymous user. uid is 1 here for now, but very soon it will be changed
 371    // to 0.
 372    db_query("INSERT INTO {users} (name, mail) VALUES('%s', '%s')", '', '');
 373  
 374    // We need some placeholders here as name and mail are uniques and data is
 375    // presumed to be a serialized array. Install will change uid 1 immediately
 376    // anyways. So we insert the superuser here, the uid is 2 here for now, but
 377    // very soon it will be changed to 1.
 378    db_query("INSERT INTO {users} (name, mail, created, data) VALUES('%s', '%s', %d, '%s')", 'placeholder-for-uid-1', 'placeholder-for-uid-1', time(), serialize(array()));
 379  
 380    // This sets the above two users uid 0 (anonymous). We avoid an explicit 0
 381    // otherwise MySQL might insert the next auto_increment value.
 382    db_query("UPDATE {users} SET uid = uid - uid WHERE name = '%s'", '');
 383  
 384    // This sets uid 1 (superuser). We skip uid 2 but that's not a big problem.
 385    db_query("UPDATE {users} SET uid = 1 WHERE name = '%s'", 'placeholder-for-uid-1');
 386  
 387    db_query("INSERT INTO {role} (name) VALUES ('%s')", 'anonymous user');
 388    $rid_anonymous = db_last_insert_id('role', 'rid');
 389  
 390    db_query("INSERT INTO {role} (name) VALUES ('%s')", 'authenticated user');
 391    $rid_authenticated = db_last_insert_id('role', 'rid');
 392  
 393    // Sanity check to ensure the anonymous and authenticated role IDs are the 
 394    // same as the drupal defined constants. In certain situations, this will 
 395    // not be true
 396    if ($rid_anonymous != DRUPAL_ANONYMOUS_RID) {
 397      db_query("UPDATE {role} SET rid = %d WHERE rid = %d", DRUPAL_ANONYMOUS_RID, $rid_anonymous);
 398    }
 399  
 400    if ($rid_authenticated != DRUPAL_AUTHENTICATED_RID) {
 401      db_query("UPDATE {role} SET rid = %d WHERE rid = %d", DRUPAL_AUTHENTICATED_RID, $rid_authenticated);
 402    }
 403  
 404    db_query("INSERT INTO {permission} (rid, perm, tid) VALUES (%d, '%s', %d)", DRUPAL_ANONYMOUS_RID, 'access content', 0);
 405    db_query("INSERT INTO {permission} (rid, perm, tid) VALUES (%d, '%s', %d)", DRUPAL_AUTHENTICATED_RID, 'access comments, access content, post comments, post comments without approval', 0);
 406  
 407    db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", 'theme_default', 's:7:"garland";');
 408  
 409    db_query("UPDATE {system} SET status = %d WHERE type = '%s' AND name = '%s'", 1, 'theme', 'garland');
 410    db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, pages, cache) VALUES ('%s', '%s', '%s', %d, %d, '%s', '%s', %d)", 'user', '0', 'garland', 1, 0, 'left', '', -1);
 411    db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, pages, cache) VALUES ('%s', '%s', '%s', %d, %d, '%s', '%s', %d)", 'user', '1', 'garland', 1, 0, 'left', '', -1);
 412    db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, pages, cache) VALUES ('%s', '%s', '%s', %d, %d, '%s', '%s', %d)", 'system', '0', 'garland', 1, 10, 'footer', '', -1);
 413  
 414    db_query("INSERT INTO {node_access} (nid, gid, realm, grant_view, grant_update, grant_delete) VALUES (%d, %d, '%s', %d, %d, %d)", 0, 0, 'all', 1, 0, 0);
 415  
 416    // Add input formats.
 417    db_query("INSERT INTO {filter_formats} (name, roles, cache) VALUES ('%s', '%s', %d)", 'Filtered HTML', ',' . DRUPAL_ANONYMOUS_RID . ',' . DRUPAL_AUTHENTICATED_RID . ',', 1);
 418    $filtered_html_format = db_last_insert_id('filter_formats', 'format');
 419    db_query("INSERT INTO {filter_formats} (name, roles, cache) VALUES ('%s', '%s', %d)", 'Full HTML', '', 1);
 420    $full_html_format = db_last_insert_id('filter_formats', 'format');
 421  
 422    // Enable filters for each input format.
 423  
 424    // Filtered HTML:
 425    // URL filter.
 426    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $filtered_html_format, 'filter', 2, 0);
 427    // HTML filter.
 428    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $filtered_html_format, 'filter', 0, 1);
 429    // Line break filter.
 430    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $filtered_html_format, 'filter', 1, 2);
 431    // HTML corrector filter.
 432    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $filtered_html_format, 'filter', 3, 10);
 433  
 434    // Full HTML:
 435    // URL filter.
 436    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $full_html_format, 'filter', 2, 0);
 437    // Line break filter.
 438    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $full_html_format, 'filter', 1, 1);
 439    // HTML corrector filter.
 440    db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $full_html_format, 'filter', 3, 10);
 441  
 442    db_query("INSERT INTO {variable} (name, value) VALUES ('%s','%s')", 'filter_html_1', 'i:1;');
 443    db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", 'node_options_forum', 'a:1:{i:0;s:6:"status";}');
 444  }
 445  
 446  /**
 447   * Implementation of hook_schema().
 448   */
 449  function system_schema() {
 450    // NOTE: {variable} needs to be created before all other tables, as
 451    // some database drivers, e.g. Oracle and DB2, will require variable_get()
 452    // and variable_set() for overcoming some database specific limitations.
 453    $schema['variable'] = array(
 454      'description' => 'Named variable/value pairs created by Drupal core or any other module or theme. All variables are cached in memory at the start of every Drupal request so developers should not be careless about what is stored here.',
 455      'fields' => array(
 456        'name' => array(
 457          'description' => 'The name of the variable.',
 458          'type' => 'varchar',
 459          'length' => 128,
 460          'not null' => TRUE,
 461          'default' => ''),
 462        'value' => array(
 463          'description' => 'The value of the variable.',
 464          'type' => 'text',
 465          'not null' => TRUE,
 466          'size' => 'big'),
 467        ),
 468      'primary key' => array('name'),
 469      );
 470  
 471    $schema['actions'] = array(
 472      'description' => 'Stores action information.',
 473      'fields' => array(
 474        'aid' => array(
 475          'description' => 'Primary Key: Unique actions ID.',
 476          'type' => 'varchar',
 477          'length' => 255,
 478          'not null' => TRUE,
 479          'default' => '0'),
 480        'type' => array(
 481          'description' => 'The object that that action acts on (node, user, comment, system or custom types.)',
 482          'type' => 'varchar',
 483          'length' => 32,
 484          'not null' => TRUE,
 485          'default' => ''),
 486        'callback' => array(
 487          'description' => 'The callback function that executes when the action runs.',
 488          'type' => 'varchar',
 489          'length' => 255,
 490          'not null' => TRUE,
 491          'default' => ''),
 492        'parameters' => array(
 493          'description' => 'Parameters to be passed to the callback function.',
 494          'type' => 'text',
 495          'not null' => TRUE,
 496          'size' => 'big'),
 497        'description' => array(
 498          'description' => 'Description of the action.',
 499          'type' => 'varchar',
 500          'length' => 255,
 501          'not null' => TRUE,
 502          'default' => '0'),
 503        ),
 504      'primary key' => array('aid'),
 505      );
 506  
 507    $schema['actions_aid'] = array(
 508      'description' => 'Stores action IDs for non-default actions.',
 509      'fields' => array(
 510        'aid' => array(
 511          'description' => 'Primary Key: Unique actions ID.',
 512          'type' => 'serial',
 513          'unsigned' => TRUE,
 514          'not null' => TRUE),
 515        ),
 516      'primary key' => array('aid'),
 517      );
 518  
 519    $schema['batch'] = array(
 520      'description' => t('Stores details about batches (processes that run in multiple HTTP requests).'),
 521      'fields' => array(
 522        'bid' => array(
 523          'description' => 'Primary Key: Unique batch ID.',
 524          'type' => 'serial',
 525          'unsigned' => TRUE,
 526          'not null' => TRUE),
 527        'token' => array(
 528          'description' => "A string token generated against the current user's session id and the batch id, used to ensure that only the user who submitted the batch can effectively access it.",
 529          'type' => 'varchar',
 530          'length' => 64,
 531          'not null' => TRUE),
 532        'timestamp' => array(
 533          'description' => 'A Unix timestamp indicating when this batch was submitted for processing. Stale batches are purged at cron time.',
 534          'type' => 'int',
 535          'not null' => TRUE),
 536        'batch' => array(
 537          'description' => 'A serialized array containing the processing data for the batch.',
 538          'type' => 'text',
 539          'not null' => FALSE,
 540          'size' => 'big')
 541        ),
 542      'primary key' => array('bid'),
 543      'indexes' => array('token' => array('token')),
 544      );
 545  
 546    $schema['cache'] = array(
 547      'description' => 'Generic cache table for caching things not separated out into their own tables. Contributed modules may also use this to store cached items.',
 548      'fields' => array(
 549        'cid' => array(
 550          'description' => 'Primary Key: Unique cache ID.',
 551          'type' => 'varchar',
 552          'length' => 255,
 553          'not null' => TRUE,
 554          'default' => ''),
 555        'data' => array(
 556          'description' => 'A collection of data to cache.',
 557          'type' => 'blob',
 558          'not null' => FALSE,
 559          'size' => 'big'),
 560        'expire' => array(
 561          'description' => 'A Unix timestamp indicating when the cache entry should expire, or 0 for never.',
 562          'type' => 'int',
 563          'not null' => TRUE,
 564          'default' => 0),
 565        'created' => array(
 566          'description' => 'A Unix timestamp indicating when the cache entry was created.',
 567          'type' => 'int',
 568          'not null' => TRUE,
 569          'default' => 0),
 570        'headers' => array(
 571          'description' => 'Any custom HTTP headers to be added to cached data.',
 572          'type' => 'text',
 573          'not null' => FALSE),
 574        'serialized' => array(
 575          'description' => 'A flag to indicate whether content is serialized (1) or not (0).',
 576          'type' => 'int',
 577          'size' => 'small',
 578          'not null' => TRUE,
 579          'default' => 0)
 580        ),
 581      'indexes' => array('expire' => array('expire')),
 582      'primary key' => array('cid'),
 583      );
 584  
 585    $schema['cache_form'] = $schema['cache'];
 586    $schema['cache_form']['description'] = 'Cache table for the form system to store recently built forms and their storage data, to be used in subsequent page requests.';
 587    $schema['cache_page'] = $schema['cache'];
 588    $schema['cache_page']['description'] = 'Cache table used to store compressed pages for anonymous users, if page caching is enabled.';
 589    $schema['cache_menu'] = $schema['cache'];
 590    $schema['cache_menu']['description'] = 'Cache table for the menu system to store router information as well as generated link trees for various menu/page/user combinations.';
 591  
 592    $schema['files'] = array(
 593      'description' => 'Stores information for uploaded files.',
 594      'fields' => array(
 595        'fid' => array(
 596          'description' => 'Primary Key: Unique files ID.',
 597          'type' => 'serial',
 598          'unsigned' => TRUE,
 599          'not null' => TRUE),
 600        'uid' => array(
 601          'description' => 'The {users}.uid of the user who is associated with the file.',
 602          'type' => 'int',
 603          'unsigned' => TRUE,
 604          'not null' => TRUE,
 605          'default' => 0),
 606        'filename' => array(
 607          'description' => 'Name of the file.',
 608          'type' => 'varchar',
 609          'length' => 255,
 610          'not null' => TRUE,
 611          'default' => ''),
 612        'filepath' => array(
 613          'description' => 'Path of the file relative to Drupal root.',
 614          'type' => 'varchar',
 615          'length' => 255,
 616          'not null' => TRUE,
 617          'default' => ''),
 618        'filemime' => array(
 619          'description' => 'The file MIME type.',
 620          'type' => 'varchar',
 621          'length' => 255,
 622          'not null' => TRUE,
 623          'default' => ''),
 624        'filesize' => array(
 625          'description' => 'The size of the file in bytes.',
 626          'type' => 'int',
 627          'unsigned' => TRUE,
 628          'not null' => TRUE,
 629          'default' => 0),
 630        'status' => array(
 631          'description' => 'A flag indicating whether file is temporary (0) or permanent (1).',
 632          'type' => 'int',
 633          'not null' => TRUE,
 634          'default' => 0),
 635        'timestamp' => array(
 636          'description' => 'UNIX timestamp for when the file was added.',
 637          'type' => 'int',
 638          'unsigned' => TRUE,
 639          'not null' => TRUE,
 640          'default' => 0),
 641        ),
 642      'indexes' => array(
 643        'uid' => array('uid'),
 644        'status' => array('status'),
 645        'timestamp' => array('timestamp'),
 646        ),
 647      'primary key' => array('fid'),
 648      );
 649  
 650    $schema['flood'] = array(
 651      'description' => 'Flood controls the threshold of events, such as the number of contact attempts.',
 652      'fields' => array(
 653        'fid' => array(
 654          'description' => 'Unique flood event ID.',
 655          'type' => 'serial',
 656          'not null' => TRUE),
 657        'event' => array(
 658          'description' => 'Name of event (e.g. contact).',
 659          'type' => 'varchar',
 660          'length' => 64,
 661          'not null' => TRUE,
 662          'default' => ''),
 663        'hostname' => array(
 664          'description' => 'Hostname of the visitor.',
 665          'type' => 'varchar',
 666          'length' => 128,
 667          'not null' => TRUE,
 668          'default' => ''),
 669        'timestamp' => array(
 670          'description' => 'Timestamp of the event.',
 671          'type' => 'int',
 672          'not null' => TRUE,
 673          'default' => 0)
 674        ),
 675      'primary key' => array('fid'),
 676      'indexes' => array(
 677        'allow' => array('event', 'hostname', 'timestamp'),
 678      ),
 679      );
 680  
 681    $schema['history'] = array(
 682      'description' => 'A record of which {users} have read which {node}s.',
 683      'fields' => array(
 684        'uid' => array(
 685          'description' => 'The {users}.uid that read the {node} nid.',
 686          'type' => 'int',
 687          'not null' => TRUE,
 688          'default' => 0),
 689        'nid' => array(
 690          'description' => 'The {node}.nid that was read.',
 691          'type' => 'int',
 692          'not null' => TRUE,
 693          'default' => 0),
 694        'timestamp' => array(
 695          'description' => 'The Unix timestamp at which the read occurred.',
 696          'type' => 'int',
 697          'not null' => TRUE,
 698          'default' => 0)
 699        ),
 700      'primary key' => array('uid', 'nid'),
 701      'indexes' => array(
 702        'nid' => array('nid'),
 703      ),
 704      );
 705    $schema['menu_router'] = array(
 706      'description' => 'Maps paths to various callbacks (access, page and title)',
 707      'fields' => array(
 708        'path' => array(
 709          'description' => 'Primary Key: the Drupal path this entry describes',
 710          'type' => 'varchar',
 711          'length' => 255,
 712          'not null' => TRUE,
 713          'default' => ''),
 714        'load_functions' => array(
 715          'description' => 'A serialized array of function names (like node_load) to be called to load an object corresponding to a part of the current path.',
 716          'type' => 'text',
 717          'not null' => TRUE,),
 718        'to_arg_functions' => array(
 719          'description' => 'A serialized array of function names (like user_uid_optional_to_arg) to be called to replace a part of the router path with another string.',
 720          'type' => 'text',
 721          'not null' => TRUE,),
 722        'access_callback' => array(
 723          'description' => 'The callback which determines the access to this router path. Defaults to user_access.',
 724          'type' => 'varchar',
 725          'length' => 255,
 726          'not null' => TRUE,
 727          'default' => ''),
 728        'access_arguments' => array(
 729          'description' => 'A serialized array of arguments for the access callback.',
 730          'type' => 'text',
 731          'not null' => FALSE),
 732        'page_callback' => array(
 733          'description' => 'The name of the function that renders the page.',
 734          'type' => 'varchar',
 735          'length' => 255,
 736          'not null' => TRUE,
 737          'default' => ''),
 738        'page_arguments' => array(
 739          'description' => 'A serialized array of arguments for the page callback.',
 740          'type' => 'text',
 741          'not null' => FALSE),
 742        'fit' => array(
 743          'description' => 'A numeric representation of how specific the path is.',
 744          'type' => 'int',
 745          'not null' => TRUE,
 746          'default' => 0),
 747        'number_parts' => array(
 748          'description' => 'Number of parts in this router path.',
 749          'type' => 'int',
 750          'not null' => TRUE,
 751          'default' => 0,
 752          'size' => 'small'),
 753        'tab_parent' => array(
 754          'description' => 'Only for local tasks (tabs) - the router path of the parent page (which may also be a local task).',
 755          'type' => 'varchar',
 756          'length' => 255,
 757          'not null' => TRUE,
 758          'default' => ''),
 759        'tab_root' => array(
 760          'description' => 'Router path of the closest non-tab parent page. For pages that are not local tasks, this will be the same as the path.',
 761          'type' => 'varchar',
 762          'length' => 255,
 763          'not null' => TRUE,
 764          'default' => ''),
 765        'title' => array(
 766          'description' => 'The title for the current page, or the title for the tab if this is a local task.',
 767          'type' => 'varchar',
 768          'length' => 255,
 769          'not null' => TRUE,
 770          'default' => ''),
 771        'title_callback' => array(
 772          'description' => 'A function which will alter the title. Defaults to t()',
 773          'type' => 'varchar',
 774          'length' => 255,
 775          'not null' => TRUE,
 776          'default' => ''),
 777        'title_arguments' => array(
 778          'description' => 'A serialized array of arguments for the title callback. If empty, the title will be used as the sole argument for the title callback.',
 779          'type' => 'varchar',
 780          'length' => 255,
 781          'not null' => TRUE,
 782          'default' => ''),
 783        'type' => array(
 784          'description' => 'Numeric representation of the type of the menu item, like MENU_LOCAL_TASK.',
 785          'type' => 'int',
 786          'not null' => TRUE,
 787          'default' => 0),
 788        'block_callback' => array(
 789          'description' => 'Name of a function used to render the block on the system administration page for this item.',
 790          'type' => 'varchar',
 791          'length' => 255,
 792          'not null' => TRUE,
 793          'default' => ''),
 794        'description' => array(
 795          'description' => 'A description of this item.',
 796          'type' => 'text',
 797          'not null' => TRUE),
 798        'position' => array(
 799          'description' => 'The position of the block (left or right) on the system administration page for this item.',
 800          'type' => 'varchar',
 801          'length' => 255,
 802          'not null' => TRUE,
 803          'default' => ''),
 804        'weight' => array(
 805          'description' => 'Weight of the element. Lighter weights are higher up, heavier weights go down.',
 806          'type' => 'int',
 807          'not null' => TRUE,
 808          'default' => 0),
 809        'file' => array(
 810          'description' => 'The file to include for this element, usually the page callback function lives in this file.',
 811          'type' => 'text',
 812          'size' => 'medium')
 813        ),
 814      'indexes' => array(
 815        'fit' => array('fit'),
 816        'tab_parent' => array('tab_parent'),
 817        'tab_root_weight_title' => array(array('tab_root', 64), 'weight', 'title'),      
 818        ),
 819      'primary key' => array('path'),
 820      );
 821  
 822    $schema['menu_links'] = array(
 823      'description' => 'Contains the individual links within a menu.',
 824      'fields' => array(
 825       'menu_name' => array(
 826          'description' => "The menu name. All links with the same menu name (such as 'navigation') are part of the same menu.",
 827          'type' => 'varchar',
 828          'length' => 32,
 829          'not null' => TRUE,
 830          'default' => ''),
 831        'mlid' => array(
 832          'description' => 'The menu link ID (mlid) is the integer primary key.',
 833          'type' => 'serial',
 834          'unsigned' => TRUE,
 835          'not null' => TRUE),
 836        'plid' => array(
 837          'description' => 'The parent link ID (plid) is the mlid of the link above in the hierarchy, or zero if the link is at the top level in its menu.',
 838          'type' => 'int',
 839          'unsigned' => TRUE,
 840          'not null' => TRUE,
 841          'default' => 0),
 842        'link_path' => array(
 843          'description' => 'The Drupal path or external path this link points to.',
 844          'type' => 'varchar',
 845          'length' => 255,
 846          'not null' => TRUE,
 847          'default' => ''),
 848        'router_path' => array(
 849          'description' => 'For links corresponding to a Drupal path (external = 0), this connects the link to a {menu_router}.path for joins.',
 850          'type' => 'varchar',
 851          'length' => 255,
 852          'not null' => TRUE,
 853          'default' => ''),
 854        'link_title' => array(
 855        'description' => 'The text displayed for the link, which may be modified by a title callback stored in {menu_router}.',
 856          'type' => 'varchar',
 857          'length' => 255,
 858          'not null' => TRUE,
 859          'default' => ''),
 860        'options' => array(
 861          'description' => 'A serialized array of options to be passed to the url() or l() function, such as a query string or HTML attributes.',
 862          'type' => 'text',
 863          'not null' => FALSE),
 864        'module' => array(
 865          'description' => 'The name of the module that generated this link.',
 866          'type' => 'varchar',
 867          'length' => 255,
 868          'not null' => TRUE,
 869          'default' => 'system'),
 870        'hidden' => array(
 871          'description' => 'A flag for whether the link should be rendered in menus. (1 = a disabled menu item that may be shown on admin screens, -1 = a menu callback, 0 = a normal, visible link)',
 872          'type' => 'int',
 873          'not null' => TRUE,
 874          'default' => 0,
 875          'size' => 'small'),
 876        'external' => array(
 877          'description' => 'A flag to indicate if the link points to a full URL starting with a protocol, like http:// (1 = external, 0 = internal).',
 878          'type' => 'int',
 879          'not null' => TRUE,
 880          'default' => 0,
 881          'size' => 'small'),
 882        'has_children' => array(
 883          'description' => 'Flag indicating whether any links have this link as a parent (1 = children exist, 0 = no children).',
 884          'type' => 'int',
 885          'not null' => TRUE,
 886          'default' => 0,
 887          'size' => 'small'),
 888        'expanded' => array(
 889          'description' => 'Flag for whether this link should be rendered as expanded in menus - expanded links always have their child links displayed, instead of only when the link is in the active trail (1 = expanded, 0 = not expanded)',
 890          'type' => 'int',
 891          'not null' => TRUE,
 892          'default' => 0,
 893          'size' => 'small'),
 894        'weight' => array(
 895          'description' => 'Link weight among links in the same menu at the same depth.',
 896          'type' => 'int',
 897          'not null' => TRUE,
 898          'default' => 0),
 899        'depth' => array(
 900          'description' => 'The depth relative to the top level. A link with plid == 0 will have depth == 1.',
 901          'type' => 'int',
 902          'not null' => TRUE,
 903          'default' => 0,
 904          'size' => 'small'),
 905        'customized' => array(
 906          'description' => 'A flag to indicate that the user has manually created or edited the link (1 = customized, 0 = not customized).',
 907          'type' => 'int',
 908          'not null' => TRUE,
 909          'default' => 0,
 910          'size' => 'small'),
 911        'p1' => array(
 912          'description' => 'The first mlid in the materialized path. If N = depth, then pN must equal the mlid. If depth > 1 then p(N-1) must equal the plid. All pX where X > depth must equal zero. The columns p1 .. p9 are also called the parents.',
 913          'type' => 'int',
 914          'unsigned' => TRUE,
 915          'not null' => TRUE,
 916          'default' => 0),
 917        'p2' => array(
 918          'description' => 'The second mlid in the materialized path. See p1.',
 919          'type' => 'int',
 920          'unsigned' => TRUE,
 921          'not null' => TRUE,
 922          'default' => 0),
 923        'p3' => array(
 924          'description' => 'The third mlid in the materialized path. See p1.',
 925          'type' => 'int',
 926          'unsigned' => TRUE,
 927          'not null' => TRUE,
 928          'default' => 0),
 929        'p4' => array(
 930          'description' => 'The fourth mlid in the materialized path. See p1.',
 931          'type' => 'int',
 932          'unsigned' => TRUE,
 933          'not null' => TRUE,
 934          'default' => 0),
 935        'p5' => array(
 936          'description' => 'The fifth mlid in the materialized path. See p1.',
 937          'type' => 'int',
 938          'unsigned' => TRUE,
 939          'not null' => TRUE,
 940          'default' => 0),
 941        'p6' => array(
 942          'description' => 'The sixth mlid in the materialized path. See p1.',
 943          'type' => 'int',
 944          'unsigned' => TRUE,
 945          'not null' => TRUE,
 946          'default' => 0),
 947        'p7' => array(
 948          'description' => 'The seventh mlid in the materialized path. See p1.',
 949          'type' => 'int',
 950          'unsigned' => TRUE,
 951          'not null' => TRUE,
 952          'default' => 0),
 953        'p8' => array(
 954          'description' => 'The eighth mlid in the materialized path. See p1.',
 955          'type' => 'int',
 956          'unsigned' => TRUE,
 957          'not null' => TRUE,
 958          'default' => 0),
 959        'p9' => array(
 960          'description' => 'The ninth mlid in the materialized path. See p1.',
 961          'type' => 'int',
 962          'unsigned' => TRUE,
 963          'not null' => TRUE,
 964          'default' => 0),
 965        'updated' => array(
 966          'description' => 'Flag that indicates that this link was generated during the update from Drupal 5.',
 967          'type' => 'int',
 968          'not null' => TRUE,
 969          'default' => 0,
 970          'size' => 'small'),
 971        ),
 972      'indexes' => array(
 973        'path_menu' => array(array('link_path', 128), 'menu_name'),
 974        'menu_plid_expand_child' => array(
 975          'menu_name', 'plid', 'expanded', 'has_children'),
 976        'menu_parents' => array(
 977          'menu_name', 'p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7', 'p8', 'p9'),
 978        'router_path' => array(array('router_path', 128)),
 979        ),
 980      'primary key' => array('mlid'),
 981      );
 982  
 983    $schema['semaphore'] = array(
 984      'description' => 'Table for holding semaphores, locks, flags, etc. that cannot be stored as Drupal variables since they must not be cached.',
 985      'fields' => array(
 986        'name' => array(
 987          'description' => 'Primary Key: Unique name.',
 988          'type' => 'varchar',
 989          'length' => 255,
 990          'not null' => TRUE,
 991          'default' => ''),
 992        'value' => array(
 993          'description' => 'A value.',
 994          'type' => 'varchar',
 995          'length' => 255,
 996          'not null' => TRUE,
 997          'default' => ''),
 998        'expire' => array(
 999          'description' => 'A Unix timestamp with microseconds indicating when the semaphore should expire.',
1000          'type' => 'float',
1001          'size' => 'big',
1002          'not null' => TRUE),
1003        ),
1004      'indexes' => array('expire' => array('expire')),
1005      'primary key' => array('name'),
1006      );
1007  
1008    $schema['sessions'] = array(
1009      'description' => "Drupal's session handlers read and write into the sessions table. Each record represents a user session, either anonymous or authenticated.",
1010      'fields' => array(
1011        'uid' => array(
1012          'description' => 'The {users}.uid corresponding to a session, or 0 for anonymous user.',
1013          'type' => 'int',
1014          'unsigned' => TRUE,
1015          'not null' => TRUE),
1016        'sid' => array(
1017          'description' => "Primary key: A session ID. The value is generated by PHP's Session API.",
1018          'type' => 'varchar',
1019          'length' => 64,
1020          'not null' => TRUE,
1021          'default' => ''),
1022        'hostname' => array(
1023          'description' => 'The IP address that last used this session ID (sid).',
1024          'type' => 'varchar',
1025          'length' => 128,
1026          'not null' => TRUE,
1027          'default' => ''),
1028        'timestamp' => array(
1029          'description' => 'The Unix timestamp when this session last requested a page. Old records are purged by PHP automatically.',
1030          'type' => 'int',
1031          'not null' => TRUE,
1032          'default' => 0),
1033        'cache' => array(
1034          'description' => "The time of this user's last post. This is used when the site has specified a minimum_cache_lifetime. See cache_get().",
1035          'type' => 'int',
1036          'not null' => TRUE,
1037          'default' => 0),
1038        'session' => array(
1039          'description' => 'The serialized contents of $_SESSION, an array of name/value pairs that persists across page requests by this session ID. Drupal loads $_SESSION from here at the start of each request and saves it at the end.',
1040          'type' => 'text',
1041          'not null' => FALSE,
1042          'size' => 'big')
1043        ),
1044      'primary key' => array('sid'),
1045      'indexes' => array(
1046        'timestamp' => array('timestamp'),
1047        'uid' => array('uid')
1048        ),
1049      );
1050  
1051    $schema['system'] = array(
1052      'description' => "A list of all modules, themes, and theme engines that are or have been installed in Drupal's file system.",
1053      'fields' => array(
1054        'filename' => array(
1055          'description' => 'The path of the primary file for this item, relative to the Drupal root; e.g. modules/node/node.module.',
1056          'type' => 'varchar',
1057          'length' => 255,
1058          'not null' => TRUE,
1059          'default' => ''),
1060        'name' => array(
1061          'description' => 'The name of the item; e.g. node.',
1062          'type' => 'varchar',
1063          'length' => 255,
1064          'not null' => TRUE,
1065          'default' => ''),
1066        'type' => array(
1067          'description' => 'The type of the item, either module, theme, or theme_engine.',
1068          'type' => 'varchar',
1069          'length' => 255,
1070          'not null' => TRUE,
1071          'default' => ''),
1072        'owner' => array(
1073          'description' => "A theme's 'parent'. Can be either a theme or an engine.",
1074          'type' => 'varchar',
1075          'length' => 255,
1076          'not null' => TRUE,
1077          'default' => ''),
1078        'status' => array(
1079          'description' => 'Boolean indicating whether or not this item is enabled.',
1080          'type' => 'int',
1081          'not null' => TRUE,
1082          'default' => 0),
1083        'throttle' => array(
1084          'description' => 'Boolean indicating whether this item is disabled when the throttle.module disables throttleable items.',
1085          'type' => 'int',
1086          'not null' => TRUE,
1087          'default' => 0,
1088          'size' => 'tiny'),
1089        'bootstrap' => array(
1090          'description' => "Boolean indicating whether this module is loaded during Drupal's early bootstrapping phase (e.g. even before the page cache is consulted).",
1091          'type' => 'int',
1092          'not null' => TRUE,
1093          'default' => 0),
1094        'schema_version' => array(
1095          'description' => "The module's database schema version number. -1 if the module is not installed (its tables do not exist); 0 or the largest N of the module's hook_update_N() function that has either been run or existed when the module was first installed.",
1096          'type' => 'int',
1097          'not null' => TRUE,
1098          'default' => -1,
1099          'size' => 'small'),
1100        'weight' => array(
1101          'description' => "The order in which this module's hooks should be invoked relative to other modules. Equal-weighted modules are ordered by name.",
1102          'type' => 'int',
1103          'not null' => TRUE,
1104          'default' => 0),
1105        'info' => array(
1106          'description' => "A serialized array containing information from the module's .info file; keys can include name, description, package, version, core, dependencies, dependents, and php.",
1107          'type' => 'text',
1108          'not null' => FALSE)
1109        ),
1110      'primary key' => array('filename'),
1111      'indexes' =>
1112        array(
1113          'modules' => array(array('type', 12), 'status', 'weight', 'filename'),
1114          'bootstrap' => array(array('type', 12), 'status', 'bootstrap', 'weight', 'filename'),
1115          'type_name' => array(array('type', 12), 'name'),
1116        ),
1117      );
1118  
1119    $schema['url_alias'] = array(
1120      'description' => 'A list of URL aliases for Drupal paths; a user may visit either the source or destination path.',
1121      'fields' => array(
1122        'pid' => array(
1123          'description' => 'A unique path alias identifier.',
1124          'type' => 'serial',
1125          'unsigned' => TRUE,
1126          'not null' => TRUE),
1127        'src' => array(
1128          'description' => 'The Drupal path this alias is for; e.g. node/12.',
1129          'type' => 'varchar',
1130          'length' => 128,
1131          'not null' => TRUE,
1132          'default' => ''),
1133        'dst' => array(
1134          'description' => 'The alias for this path; e.g. title-of-the-story.',
1135          'type' => 'varchar',
1136          'length' => 128,
1137          'not null' => TRUE,
1138          'default' => ''),
1139        'language' => array(
1140          'description' => 'The language this alias is for; if blank, the alias will be used for unknown languages. Each Drupal path can have an alias for each supported language.',
1141          'type' => 'varchar',
1142          'length' => 12,
1143          'not null' => TRUE,
1144          'default' => '')
1145        ),
1146      'unique keys' => array('dst_language_pid' => array('dst', 'language', 'pid')),
1147      'primary key' => array('pid'),
1148      'indexes' => array('src_language_pid' => array('src', 'language', 'pid')),
1149      );
1150  
1151    return $schema;
1152  }
1153  
1154  // Updates for core.
1155  
1156  function system_update_last_removed() {
1157    return 1021;
1158  }
1159  
1160  /**
1161   * @defgroup updates-5.x-extra Extra system updates for 5.x
1162   * @{
1163   */
1164  
1165  /**
1166   * Add index on users created column.
1167   */
1168  function system_update_1022() {
1169    $ret = array();
1170    db_add_index($ret, 'users', 'created', array('created'));
1171    // Also appears as system_update_6004(). Ensure we don't update twice.
1172    variable_set('system_update_1022', TRUE);
1173    return $ret;
1174  }
1175  
1176  /**
1177   * @} End of "defgroup updates-5.x-extra"
1178   */
1179  
1180  /**
1181   * @defgroup updates-5.x-to-6.x System updates from 5.x to 6.x
1182   * @{
1183   */
1184  
1185  /**
1186   * Remove auto_increment from {boxes} to allow adding custom blocks with
1187   * visibility settings.
1188   */
1189  function system_update_6000() {
1190    $ret = array();
1191    switch ($GLOBALS['db_type']) {
1192      case 'mysql':
1193      case 'mysqli':
1194        $max = (int)db_result(db_query('SELECT MAX(bid) FROM {boxes}'));
1195        $ret[] = update_sql('ALTER TABLE {boxes} CHANGE COLUMN bid bid int NOT NULL');
1196        $ret[] = update_sql("REPLACE INTO {sequences} VALUES ('{boxes}_bid', $max)");
1197        break;
1198    }
1199    return $ret;
1200  }
1201  
1202  /**
1203   * Add version id column to {term_node} to allow taxonomy module to use revisions.
1204   */
1205  function system_update_6001() {
1206    $ret = array();
1207  
1208    // Add vid to term-node relation.  The schema says it is unsigned.
1209    db_add_field($ret, 'term_node', 'vid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
1210    db_drop_primary_key($ret, 'term_node');
1211    db_add_primary_key($ret, 'term_node', array('vid', 'tid', 'nid'));
1212    db_add_index($ret, 'term_node', 'vid', array('vid'));
1213  
1214    db_query('UPDATE {term_node} SET vid = (SELECT vid FROM {node} n WHERE {term_node}.nid = n.nid)');
1215    return $ret;
1216  }
1217  
1218  /**
1219   * Increase the maximum length of variable names from 48 to 128.
1220   */
1221  function system_update_6002() {
1222    $ret = array();
1223    db_drop_primary_key($ret, 'variable');
1224    db_change_field($ret, 'variable', 'name', 'name', array('type' => 'varchar', 'length' => 128, 'not null' => TRUE, 'default' => ''));
1225    db_add_primary_key($ret, 'variable', array('name'));
1226    return $ret;
1227  }
1228  
1229  /**
1230   * Add index on comments status column.
1231   */
1232  function system_update_6003() {
1233    $ret = array();
1234    db_add_index($ret, 'comments', 'status', array('status'));
1235    return $ret;
1236  }
1237  
1238  /**
1239   * This update used to add an index on users created column (#127941).
1240   * However, system_update_1022() does the same thing.  This update
1241   * tried to detect if 1022 had already run but failed to do so,
1242   * resulting in an "index already exists" error.
1243   *
1244   * Adding the index here is never necessary.  Sites installed before
1245   * 1022 will run 1022, getting the update.  Sites installed on/after 1022
1246   * got the index when the table was first created.  Therefore, this
1247   * function is now a no-op.
1248   */
1249  function system_update_6004() {
1250    return array();
1251  }
1252  
1253  /**
1254   * Add language to url_alias table and modify indexes.
1255   */
1256  function system_update_6005() {
1257    $ret = array();
1258    switch ($GLOBALS['db_type']) {
1259      case 'pgsql':
1260        db_add_column($ret, 'url_alias', 'language', 'varchar(12)', array('default' => "''", 'not null' => TRUE));
1261  
1262        // As of system.install:1.85 (before the new language
1263        // subsystem), new installs got a unique key named
1264        // url_alias_dst_key on url_alias.dst.  Unfortunately,
1265        // system_update_162 created a unique key inconsistently named
1266        // url_alias_dst_idx on url_alias.dst (keys should have the _key
1267        // suffix, indexes the _idx suffix).  Therefore, sites installed
1268        // before system_update_162 have a unique key with a different
1269        // name than sites installed after system_update_162().  Now, we
1270        // want to drop the unique key on dst which may have either one
1271        // of two names and create a new unique key on (dst, language).
1272        // There is no way to know which key name exists so we have to
1273        // drop both, causing an SQL error.  Thus, we just hide the
1274        // error and only report the update_sql results that work.
1275        $err = error_reporting(0);
1276        $ret1 = update_sql('DROP INDEX {url_alias}_dst_idx');
1277        if ($ret1['success']) {
1278    $ret[] = $ret1;
1279        }
1280        $ret1 = array();
1281        db_drop_unique_key($ret, 'url_alias', 'dst');
1282        foreach ($ret1 as $r) {
1283    if ($r['success']) {
1284      $ret[] = $r;
1285    }
1286        }
1287        error_reporting($err);
1288  
1289        $ret[] = update_sql('CREATE UNIQUE INDEX {url_alias}_dst_language_idx ON {url_alias}(dst, language)');
1290        break;
1291      case 'mysql':
1292      case 'mysqli':
1293        $ret[] = update_sql("ALTER TABLE {url_alias} ADD language varchar(12) NOT NULL default ''");
1294        $ret[] = update_sql("ALTER TABLE {url_alias} DROP INDEX dst");
1295        $ret[] = update_sql("ALTER TABLE {url_alias} ADD UNIQUE dst_language (dst, language)");
1296        break;
1297    }
1298    return $ret;
1299  }
1300  
1301  /**
1302   * Drop useless indices on node_counter table.
1303   */
1304  function system_update_6006() {
1305    $ret = array();
1306    switch ($GLOBALS['db_type']) {
1307      case 'pgsql':
1308        $ret[] = update_sql('DROP INDEX {node_counter}_daycount_idx');
1309        $ret[] = update_sql('DROP INDEX {node_counter}_totalcount_idx');
1310        $ret[] = update_sql('DROP INDEX {node_counter}_timestamp_idx');
1311        break;
1312      case 'mysql':
1313      case 'mysqli':
1314        $ret[] = update_sql("ALTER TABLE {node_counter} DROP INDEX daycount");
1315        $ret[] = update_sql("ALTER TABLE {node_counter} DROP INDEX totalcount");
1316        $ret[] = update_sql("ALTER TABLE {node_counter} DROP INDEX timestamp");
1317        break;
1318    }
1319    return $ret;
1320  }
1321  
1322  /**
1323   * Change the severity column in the watchdog table to the new values.
1324   */
1325  function system_update_6007() {
1326    $ret = array();
1327    $ret[] = update_sql("UPDATE {watchdog} SET severity = ". WATCHDOG_NOTICE ." WHERE severity = 0");
1328    $ret[] = update_sql("UPDATE {watchdog} SET severity = ". WATCHDOG_WARNING ." WHERE severity = 1");
1329    $ret[] = update_sql("UPDATE {watchdog} SET severity = ". WATCHDOG_ERROR ." WHERE severity = 2");
1330    return $ret;
1331  }
1332  
1333  /**
1334   * Add info files to themes.  The info and owner columns are added by
1335   * update_fix_d6_requirements() in update.php to avoid a large number
1336   * of error messages from update.php.  All we need to do here is copy
1337   * description to owner and then drop description.
1338   */
1339  function system_update_6008() {
1340    $ret = array();
1341    $ret[] = update_sql('UPDATE {system} SET owner = description');
1342    db_drop_field($ret, 'system', 'description');
1343  
1344    // Rebuild system table contents.
1345    module_rebuild_cache();
1346    system_theme_data();
1347  
1348    return $ret;
1349  }
1350  
1351  /**
1352   * The PHP filter is now a separate module.
1353   */
1354  function system_update_6009() {
1355    $ret = array();
1356  
1357    // If any input format used the Drupal 5 PHP filter.
1358    if (db_result(db_query("SELECT COUNT(format) FROM {filters} WHERE module = 'filter' AND delta = 1"))) {
1359      // Enable the PHP filter module.
1360      $ret[] = update_sql("UPDATE {system} SET status = 1 WHERE name = 'php' AND type = 'module'");
1361      // Update the input filters.
1362      $ret[] = update_sql("UPDATE {filters} SET delta = 0, module = 'php' WHERE module = 'filter' AND delta = 1");
1363    }
1364  
1365    // With the removal of the PHP evaluator filter, the deltas of the line break
1366    // and URL filter have changed.
1367    $ret[] = update_sql("UPDATE {filters} SET delta = 1 WHERE module = 'filter' AND delta = 2");
1368    $ret[] = update_sql("UPDATE {filters} SET delta = 2 WHERE module = 'filter' AND delta = 3");
1369  
1370    return $ret;
1371  }
1372  
1373  /**
1374   * Add variable replacement for watchdog messages.
1375   *
1376   * The variables field is NOT NULL and does not have a default value.
1377   * Existing log messages should not be translated in the new system,
1378   * so we insert 'N;' (serialize(NULL)) as the temporary default but
1379   * then remove the default value to match the schema.
1380   */
1381  function system_update_6010() {
1382    $ret = array();
1383    db_add_field($ret, 'watchdog', 'variables', array('type' => 'text', 'size' => 'big', 'not null' => TRUE, 'initial' => 'N;'));
1384    return $ret;
1385  }
1386  
1387  /**
1388   * Add language support to nodes
1389   */
1390  function system_update_6011() {
1391    $ret = array();
1392    switch ($GLOBALS['db_type']) {
1393      case 'pgsql':
1394        db_add_column($ret, 'node', 'language', 'varchar(12)', array('default' => "''", 'not null' => TRUE));
1395        break;
1396      case 'mysql':
1397      case 'mysqli':
1398        $ret[] = update_sql("ALTER TABLE {node} ADD language varchar(12) NOT NULL default ''");
1399        break;
1400    }
1401    return $ret;
1402  }
1403  
1404  /**
1405   * Add serialized field to cache tables.  This is now handled directly
1406   * by update.php, so this function is a no-op.
1407   */
1408  function system_update_6012() {
1409    return array();
1410  }
1411  
1412  /**
1413   * Rebuild cache data for theme system changes
1414   */
1415  function system_update_6013() {
1416    // Rebuild system table contents.
1417    module_rebuild_cache();
1418    system_theme_data();
1419  
1420    return array(array('success' => TRUE, 'query' => 'Cache rebuilt.'));
1421  }
1422  
1423  /**
1424   * Record that the installer is done, so it is not
1425   * possible to run the installer on upgraded sites.
1426   */
1427  function system_update_6014() {
1428    variable_set('install_task', 'done');
1429  
1430    return array(array('success' => TRUE, 'query' => "variable_set('install_task')"));
1431  }
1432  
1433  /**
1434   * Add the form cache table.
1435   */
1436  function system_update_6015() {
1437    $ret = array();
1438  
1439    switch ($GLOBALS['db_type']) {
1440      case 'pgsql':
1441        $ret[] = update_sql("CREATE TABLE {cache_form} (
1442          cid varchar(255) NOT NULL default '',
1443          data bytea,
1444          expire int NOT NULL default '0',
1445          created int NOT NULL default '0',
1446          headers text,
1447          serialized smallint NOT NULL default '0',
1448          PRIMARY KEY (cid)
1449      )");
1450        $ret[] = update_sql("CREATE INDEX {cache_form}_expire_idx ON {cache_form} (expire)");
1451        break;
1452      case 'mysql':
1453      case 'mysqli':
1454        $ret[] = update_sql("CREATE TABLE {cache_form} (
1455          cid varchar(255) NOT NULL default '',
1456          data longblob,
1457          expire int NOT NULL default '0',
1458          created int NOT NULL default '0',
1459          headers text,
1460          serialized int(1) NOT NULL default '0',
1461          PRIMARY KEY (cid),
1462          INDEX expire (expire)
1463        ) /*!40100 DEFAULT CHARACTER SET UTF8 */ ");
1464        break;
1465    }
1466  
1467    return $ret;
1468  }
1469  
1470  /**
1471   * Make {node}'s primary key be nid, change nid,vid to a unique key.
1472   * Add primary keys to block, filters, flood, permission, and term_relation.
1473   */
1474  function system_update_6016() {
1475    $ret = array();
1476  
1477    switch ($GLOBALS['db_type']) {
1478      case 'pgsql':
1479        $ret[] = update_sql("ALTER TABLE {node} ADD CONSTRAINT {node}_nid_vid_key UNIQUE (nid, vid)");
1480        db_add_column($ret, 'blocks', 'bid', 'serial');
1481        $ret[] = update_sql("ALTER TABLE {blocks} ADD PRIMARY KEY (bid)");
1482        db_add_column($ret, 'filters', 'fid', 'serial');
1483        $ret[] = update_sql("ALTER TABLE {filters} ADD PRIMARY KEY (fid)");
1484        db_add_column($ret, 'flood', 'fid', 'serial');
1485        $ret[] = update_sql("ALTER TABLE {flood} ADD PRIMARY KEY (fid)");
1486        db_add_column($ret, 'permission', 'pid', 'serial');
1487        $ret[] = update_sql("ALTER TABLE {permission} ADD PRIMARY KEY (pid)");
1488        db_add_column($ret, 'term_relation', 'trid', 'serial');
1489        $ret[] = update_sql("ALTER TABLE {term_relation} ADD PRIMARY KEY (trid)");
1490        db_add_column($ret, 'term_synonym', 'tsid', 'serial');
1491        $ret[] = update_sql("ALTER TABLE {term_synonym} ADD PRIMARY KEY (tsid)");
1492        break;
1493      case 'mysql':
1494      case 'mysqli':
1495        $ret[] = update_sql('ALTER TABLE {node} ADD UNIQUE KEY nid_vid (nid, vid)');
1496        $ret[] = update_sql("ALTER TABLE {blocks} ADD bid int NOT NULL AUTO_INCREMENT PRIMARY KEY");
1497        $ret[] = update_sql("ALTER TABLE {filters} ADD fid int NOT NULL AUTO_INCREMENT PRIMARY KEY");
1498        $ret[] = update_sql("ALTER TABLE {flood} ADD fid int NOT NULL AUTO_INCREMENT PRIMARY KEY");
1499        $ret[] = update_sql("ALTER TABLE {permission} ADD pid int NOT NULL AUTO_INCREMENT PRIMARY KEY");
1500        $ret[] = update_sql("ALTER TABLE {term_relation} ADD trid int NOT NULL AUTO_INCREMENT PRIMARY KEY");
1501        $ret[] = update_sql("ALTER TABLE {term_synonym} ADD tsid int NOT NULL AUTO_INCREMENT PRIMARY KEY");
1502        break;
1503    }
1504  
1505    return $ret;
1506  }
1507  
1508  /**
1509   * Rename settings related to user.module email notifications.
1510   */
1511  function system_update_6017() {
1512    $ret = array();
1513    // Maps old names to new ones.
1514    $var_names = array(
1515      'admin'    => 'register_admin_created',
1516      'approval' => 'register_pending_approval',
1517      'welcome'  => 'register_no_approval_required',
1518      'pass'     => 'password_reset',
1519    );
1520    foreach ($var_names as $old => $new) {
1521      foreach (array('_subject', '_body') as $suffix) {
1522        $old_name = 'user_mail_'. $old . $suffix;
1523        $new_name = 'user_mail_'. $new . $suffix;
1524        if ($old_val = variable_get($old_name, FALSE)) {
1525          variable_set($new_name, $old_val);
1526          variable_del($old_name);
1527          $ret[] = array('success' => TRUE, 'query' => "variable_set($new_name)");
1528          $ret[] = array('success' => TRUE, 'query' => "variable_del($old_name)");
1529          if ($old_name == 'user_mail_approval_body') {
1530            drupal_set_message('Saving an old value of the welcome message body for users that are pending administrator approval. However, you should consider modifying this text, since Drupal can now be configured to automatically notify users and send them their login information when their accounts are approved. See the <a href="'. url('admin/user/settings') .'">User settings</a> page for details.');
1531          }
1532        }
1533      }
1534    }
1535    return $ret;
1536  }
1537  
1538  /**
1539   * Add HTML corrector to HTML formats or replace the old module if it was in use.
1540   */
1541  function system_update_6018() {
1542    $ret = array();
1543  
1544    // Disable htmlcorrector.module, if it exists and replace its filter.
1545    if (module_exists('htmlcorrector')) {
1546      module_disable(array('htmlcorrector'));
1547      $ret[] = update_sql("UPDATE {filter_formats} SET module = 'filter', delta = 3 WHERE module = 'htmlcorrector'");
1548      $ret[] = array('success' => TRUE, 'query' => 'HTML Corrector module was disabled; this functionality has now been added to core.');
1549      return $ret;
1550    }
1551  
1552    // Otherwise, find any format with 'HTML' in its name and add the filter at the end.
1553    $result = db_query("SELECT format, name FROM {filter_formats} WHERE name LIKE '%HTML%'");
1554    while ($format = db_fetch_object($result)) {
1555      $weight = db_result(db_query("SELECT MAX(weight) FROM {filters} WHERE format = %d", $format->format));
1556      db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $format->format, 'filter', 3, max(10, $weight + 1));
1557      $ret[] = array('success' => TRUE, 'query' => "HTML corrector filter added to the '". $format->name ."' input format.");
1558    }
1559  
1560    return $ret;
1561  }
1562  
1563  /**
1564   * Reconcile small differences in the previous, manually created mysql
1565   * and pgsql schemas so they are the same and can be represented by a
1566   * single schema structure.
1567   *
1568   * Note that the mysql and pgsql cases make different changes.  This
1569   * is because each schema needs to be tweaked in different ways to
1570   * conform to the new schema structure.  Also, since they operate on
1571   * tables defined by many optional core modules which may not ever
1572   * have been installed, they must test each table for existence.  If
1573   * the modules are first installed after this update exists the tables
1574   * will be created from the schema structure and will start out
1575   * correct.
1576   */
1577  function system_update_6019() {
1578    $ret = array();
1579  
1580    switch ($GLOBALS['db_type']) {
1581      case 'pgsql':
1582        // Remove default ''.
1583        if (db_table_exists('aggregator_feed')) {
1584          db_field_set_no_default($ret, 'aggregator_feed', 'description');
1585          db_field_set_no_default($ret, 'aggregator_feed', 'image');
1586        }
1587        db_field_set_no_default($ret, 'blocks', 'pages');
1588        if (db_table_exists('contact')) {
1589          db_field_set_no_default($ret, 'contact', 'recipients');
1590          db_field_set_no_default($ret, 'contact', 'reply');
1591        }
1592        db_field_set_no_default($ret, 'watchdog', 'location');
1593        db_field_set_no_default($ret, 'node_revisions', 'body');
1594        db_field_set_no_default($ret, 'node_revisions', 'teaser');
1595        db_field_set_no_default($ret, 'node_revisions', 'log');
1596  
1597        // Update from pgsql 'float' (which means 'double precision') to
1598        // schema 'float' (which in pgsql means 'real').
1599        if (db_table_exists('search_index')) {
1600          db_change_field($ret, 'search_index', 'score', 'score', array('type' => 'float'));
1601        }
1602        if (db_table_exists('search_total')) {
1603          db_change_field($ret, 'search_total', 'count', 'count', array('type' => 'float'));
1604        }
1605  
1606        // Replace unique index dst_language with a unique constraint.  The
1607        // result is the same but the unique key fits our current schema
1608        // structure.  Also, the postgres documentation implies that
1609        // unique constraints are preferable to unique indexes.  See
1610        // http://www.postgresql.org/docs/8.2/interactive/indexes-unique.html.
1611        if (db_table_exists('url_alias')) {
1612          db_drop_index($ret, 'url_alias', 'dst_language');
1613          db_add_unique_key($ret, 'url_alias', 'dst_language',
1614            array('dst', 'language'));
1615        }
1616  
1617        // Fix term_node pkey: mysql and pgsql code had different orders.
1618        if (db_table_exists('term_node')) {
1619          db_drop_primary_key($ret, 'term_node');
1620          db_add_primary_key($ret, 'term_node', array('vid', 'tid', 'nid'));
1621        }
1622  
1623        // Make boxes.bid unsigned.
1624        db_drop_primary_key($ret, 'boxes');
1625        db_change_field($ret, 'boxes', 'bid', 'bid', array('type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE), array('primary key' => array('bid')));
1626  
1627        // Fix primary key
1628        db_drop_primary_key($ret, 'node');
1629        db_add_primary_key($ret, 'node', array('nid'));
1630  
1631        break;
1632  
1633      case 'mysql':
1634      case 'mysqli':
1635        // Rename key 'link' to 'url'.
1636        if (db_table_exists('aggregator_feed')) {
1637          db_drop_unique_key($ret, 'aggregator_feed', 'link');
1638          db_add_unique_key($ret, 'aggregator_feed', 'url', array('url'));
1639        }
1640  
1641        // Change to size => small.
1642        if (db_table_exists('boxes')) {
1643          db_change_field($ret, 'boxes', 'format', 'format', array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0));
1644        }
1645  
1646        // Change to size => small.
1647        // Rename index 'lid' to 'nid'.
1648        if (db_table_exists('comments')) {
1649          db_change_field($ret, 'comments', 'format', 'format', array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0));
1650          db_drop_index($ret, 'comments', 'lid');
1651          db_add_index($ret, 'comments', 'nid', array('nid'));
1652        }
1653  
1654        // Change to size => small.
1655        db_change_field($ret, 'cache', 'serialized', 'serialized', array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0));
1656        db_change_field($ret, 'cache_filter', 'serialized', 'serialized', array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0));
1657        db_change_field($ret, 'cache_page', 'serialized', 'serialized', array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0));
1658        db_change_field($ret, 'cache_form', 'serialized', 'serialized', array('type' => 'int', 'size' => 'small', 'not null' => TRUE, 'default' => 0));
1659  
1660        // Remove default => 0, set auto increment.
1661        $new_uid = 1 + db_result(db_query('SELECT MAX(uid) FROM {users}'));
1662        $ret[] = update_sql('UPDATE {users} SET uid = '. $new_uid .' WHERE uid = 0');
1663        db_drop_primary_key($ret, 'users');
1664        db_change_field($ret, 'users', 'uid', 'uid', array('type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE), array('primary key' => array('uid')));
1665        $ret[] = update_sql('UPDATE {users} SET uid = 0 WHERE uid = '. $new_uid);
1666  
1667        // Special field names.
1668        $map = array('node_revisions' => 'vid');
1669        // Make sure these tables have proper auto_increment fields.
1670        foreach (array('boxes', 'files', 'node', 'node_revisions') as $table) {
1671          $field = isset($map[$table]) ? $map[$table] : $table[0] .'id';
1672          db_drop_primary_key($ret, $table);
1673          db_change_field($ret, $table, $field, $field, array('type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE), array('primary key' => array($field)));
1674        }
1675  
1676        break;
1677    }
1678  
1679    return $ret;
1680  }
1681  
1682  /**
1683   * Create the tables for the new menu system.
1684   */
1685  function system_update_6020() {
1686    $ret = array();
1687  
1688    $schema['menu_router'] = array(
1689      'fields' => array(
1690        'path'             => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1691        'load_functions'   => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1692        'to_arg_functions' => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1693        'access_callback'  => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1694        'access_arguments' => array('type' => 'text', 'not null' => FALSE),
1695        'page_callback'    => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1696        'page_arguments'   => array('type' => 'text', 'not null' => FALSE),
1697        'fit'              => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
1698        'number_parts'     => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1699        'tab_parent'       => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1700        'tab_root'         => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1701        'title'            => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1702        'title_callback'   => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1703        'title_arguments'  => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1704        'type'             => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
1705        'block_callback'   => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1706        'description'      => array('type' => 'text', 'not null' => TRUE),
1707        'position'         => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1708        'weight'           => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
1709        'file'             => array('type' => 'text', 'size' => 'medium')
1710      ),
1711      'indexes' => array(
1712        'fit'        => array('fit'),
1713        'tab_parent' => array('tab_parent')
1714      ),
1715      'primary key' => array('path'),
1716    );
1717  
1718    $schema['menu_links'] = array(
1719      'fields' => array(
1720        'menu_name'    => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
1721        'mlid'         => array('type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE),
1722        'plid'         => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1723        'link_path'    => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1724        'router_path'  => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1725        'link_title'   => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1726        'options'      => array('type' => 'text', 'not null' => FALSE),
1727        'module'       => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => 'system'),
1728        'hidden'       => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1729        'external'     => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1730        'has_children' => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1731        'expanded'     => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1732        'weight'       => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
1733        'depth'        => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1734        'customized'   => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1735        'p1'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1736        'p2'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1737        'p3'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1738        'p4'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1739        'p5'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1740        'p6'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1741        'p7'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1742        'p8'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1743        'p9'           => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
1744        'updated'      => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'small'),
1745      ),
1746      'indexes' => array(
1747        'path_menu'              => array(array('link_path', 128), 'menu_name'),
1748        'menu_plid_expand_child' => array('menu_name', 'plid', 'expanded', 'has_children'),
1749        'menu_parents'           => array('menu_name', 'p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7', 'p8', 'p9'),
1750        'router_path'            => array(array('router_path', 128)),
1751      ),
1752      'primary key' => array('mlid'),
1753    );
1754  
1755    foreach ($schema as $name => $table) {
1756      db_create_table($ret, $name, $table);
1757    }
1758    return $ret;
1759  }
1760  
1761  /**
1762   * Migrate the menu items from the old menu system to the new menu_links table.
1763   */
1764  function system_update_6021() {
1765    $ret = array('#finished' => 0);
1766    $menus = array(
1767      'navigation' => array(
1768        'menu_name' => 'navigation',
1769        'title' => 'Navigation',
1770        'description' => 'The navigation menu is provided by Drupal and is the main interactive menu for any site. It is usually the only menu that contains personalized links for authenticated users, and is often not even visible to anonymous users.',
1771      ),
1772      'primary-links' => array(
1773        'menu_name' => 'primary-links',
1774        'title' => 'Primary links',
1775        'description' => 'Primary links are often used at the theme layer to show the major sections of a site. A typical representation for primary links would be tabs along the top.',
1776      ),
1777      'secondary-links' => array(
1778        'menu_name' => 'secondary-links',
1779        'title' => 'Secondary links',
1780        'description' => 'Secondary links are often used for pages like legal notices, contact details, and other secondary navigation items that play a lesser role than primary links.',
1781      ),
1782    );
1783    // Multi-part update
1784    if (!isset($_SESSION['system_update_6021'])) {
1785      db_add_field($ret, 'menu', 'converted', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0, 'size' => 'tiny'));
1786      $_SESSION['system_update_6021_max'] = db_result(db_query('SELECT COUNT(*) FROM {menu}'));
1787      $_SESSION['menu_menu_map'] = array(1 => 'navigation');
1788      // 0 => FALSE is for new menus, 1 => FALSE is for the navigation.
1789      $_SESSION['menu_item_map'] = array(0 => FALSE, 1 => FALSE);
1790      $table = array(
1791        'fields' => array(
1792          'menu_name'   => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
1793          'title'       => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
1794          'description' => array('type' => 'text', 'not null' => FALSE),
1795        ),
1796        'primary key' => array('menu_name'),
1797      );
1798      db_create_table($ret, 'menu_custom', $table);
1799      db_query("INSERT INTO {menu_custom} (menu_name, title, description) VALUES ('%s', '%s', '%s')", $menus['navigation']);
1800      $_SESSION['system_update_6021'] = 0;
1801    }
1802  
1803    $limit = 50;
1804    while ($limit-- && ($item = db_fetch_array(db_query_range('SELECT * FROM {menu} WHERE converted = 0', 0, 1)))) {
1805      // If it's not a menu...
1806      if ($item['pid']) {
1807        // Let's climb up until we find an item with a converted parent.
1808        $item_original = $item;
1809        while ($item && !isset($_SESSION['menu_item_map'][$item['pid']])) {
1810          $item = db_fetch_array(db_query('SELECT * FROM {menu} WHERE mid = %d', $item['pid']));
1811        }
1812        // This can only occur if the menu entry is a leftover in the menu table.
1813        // These do not appear in Drupal 5 anyways, so we skip them.
1814        if (!$item) {
1815          db_query('UPDATE {menu} SET converted = %d WHERE mid = %d', 1, $item_original['mid']);
1816          $_SESSION['system_update_6021']++;
1817          continue;
1818        }
1819      }
1820      // We need to recheck because item might have changed.
1821      if ($item['pid']) {
1822        // Fill the new fields.
1823        $item['link_title'] = $item['title'];
1824        $item['link_path'] = drupal_get_normal_path($item['path']);
1825        // We know the parent is already set. If it's not FALSE then it's an item.
1826        if ($_SESSION['menu_item_map'][$item['pid']]) {
1827          // The new menu system parent link id.
1828          $item['plid'] = $_SESSION['menu_item_map'][$item['pid']]['mlid'];
1829          // The new menu system menu name.
1830          $item['menu_name'] = $_SESSION['menu_item_map'][$item['pid']]['menu_name'];
1831        }
1832        else {
1833          // This a top level element.
1834          $item['plid'] = 0;
1835          // The menu name is stored among the menus.
1836          $item['menu_name'] = $_SESSION['menu_menu_map'][$item['pid']];
1837        }
1838        // Is the element visible in the menu block?
1839        $item['hidden'] = !($item['type'] & MENU_VISIBLE_IN_TREE);
1840        // Is it a custom(ized) element?
1841        if ($item['type'] & (MENU_CREATED_BY_ADMIN | MENU_MODIFIED_BY_ADMIN)) {
1842          $item['customized'] = TRUE;
1843        }
1844        // Items created via the menu module need to be assigned to it.
1845        if ($item['type'] & MENU_CREATED_BY_ADMIN) {
1846          $item['module'] = 'menu';
1847          $item['router_path'] = '';
1848          $item['updated'] = TRUE;
1849        }
1850        else {
1851          $item['module'] = 'system';
1852          $item['router_path'] = $item['path'];
1853          $item['updated'] = FALSE;
1854        }
1855        if ($item['description']) {
1856          $item['options']['attributes']['title'] = $item['description'];
1857        }      
1858        
1859        // Save the link.
1860        menu_link_save($item);
1861        $_SESSION['menu_item_map'][$item['mid']] = array('mlid' => $item['mlid'], 'menu_name' => $item['menu_name']);
1862      }
1863      elseif (!isset($_SESSION['menu_menu_map'][$item['mid']])) {
1864        $item['menu_name'] = 'menu-'. preg_replace('/[^a-zA-Z0-9]/', '-', strtolower($item['title']));
1865        $item['menu_name'] = substr($item['menu_name'], 0, 20);
1866        $original_menu_name = $item['menu_name'];
1867        $i = 0;
1868        while (db_result(db_query("SELECT menu_name FROM {menu_custom} WHERE menu_name = '%s'", $item['menu_name']))) {
1869          $item['menu_name'] = $original_menu_name . ($i++);
1870        }
1871        if ($item['path']) {
1872          // Another bunch of bogus entries. Apparently, these are leftovers
1873          // from Drupal 4.7 .
1874          $_SESSION['menu_bogus_menus'][] = $item['menu_name'];
1875        }
1876        else {
1877          // Add this menu to the list of custom menus.
1878          db_query("INSERT INTO {menu_custom} (menu_name, title, description) VALUES ('%s', '%s', '')", $item['menu_name'], $item['title']);
1879        }
1880        $_SESSION['menu_menu_map'][$item['mid']] = $item['menu_name'];
1881        $_SESSION['menu_item_map'][$item['mid']] = FALSE;
1882      }
1883      db_query('UPDATE {menu} SET converted = %d WHERE mid = %d', 1, $item['mid']);
1884      $_SESSION['system_update_6021']++;
1885    }
1886  
1887    if ($_SESSION['system_update_6021'] >= $_SESSION['system_update_6021_max']) {
1888      if (!empty($_SESSION['menu_bogus_menus'])) {
1889        // Remove entries in bogus menus. This is secure because we deleted
1890        // every non-alpanumeric character from the menu name.
1891        $ret[] = update_sql("DELETE FROM {menu_links} WHERE menu_name IN ('". implode("', '", $_SESSION['menu_bogus_menus']) ."')");
1892      }
1893  
1894      $menu_primary_menu = variable_get('menu_primary_menu', 0);
1895      // Ensure that we wind up with a system menu named 'primary-links'.
1896      if (isset($_SESSION['menu_menu_map'][2])) {
1897        // The primary links menu that ships with Drupal 5 has mid = 2.  If this
1898        // menu hasn't been deleted by the site admin, we use that.
1899        $updated_primary_links_menu = 2;
1900      }
1901      elseif (isset($_SESSION['menu_menu_map'][$menu_primary_menu]) && $menu_primary_menu > 1) {
1902        // Otherwise, we use the menu that is currently assigned to the primary
1903        // links region of the theme, as long as it exists and isn't the
1904        // Navigation menu.
1905        $updated_primary_links_menu = $menu_primary_menu;
1906      }
1907      else {
1908        // As a last resort, create 'primary-links' as a new menu.
1909        $updated_primary_links_menu = 0;
1910        db_query("INSERT INTO {menu_custom} (menu_name, title, description) VALUES ('%s', '%s', '%s')", $menus['primary-links']);
1911      }
1912  
1913      if ($updated_primary_links_menu) {
1914        // Change the existing menu name to 'primary-links'.
1915        $replace = array('%new_name' => 'primary-links', '%desc' => $menus['primary-links']['description'], '%old_name' => $_SESSION['menu_menu_map'][$updated_primary_links_menu]);
1916        $ret[] = update_sql(strtr("UPDATE {menu_custom} SET menu_name = '%new_name', description = '%desc' WHERE menu_name = '%old_name'", $replace));
1917        $ret[] = update_sql("UPDATE {menu_links} SET menu_name = 'primary-links' WHERE menu_name = '". $_SESSION['menu_menu_map'][$updated_primary_links_menu] ."'");
1918        $_SESSION['menu_menu_map'][$updated_primary_links_menu] = 'primary-links';
1919      }
1920  
1921      $menu_secondary_menu = variable_get('menu_secondary_menu', 0);
1922      // Ensure that we wind up with a system menu named 'secondary-links'.
1923      if (isset($_SESSION['menu_menu_map'][$menu_secondary_menu]) && $menu_secondary_menu > 1 && $menu_secondary_menu != $updated_primary_links_menu) {
1924        // We use the menu that is currently assigned to the secondary links
1925        // region of the theme, as long as (a) it exists, (b) it isn't the
1926        // Navigation menu, (c) it isn't the same menu we assigned as the
1927        // system 'primary-links' menu above, and (d) it isn't the same menu
1928        // assigned to the primary links region of the theme.
1929        $updated_secondary_links_menu = $menu_secondary_menu;
1930      }
1931      else {
1932        // Otherwise, create 'secondary-links' as a new menu.
1933        $updated_secondary_links_menu = 0;
1934        db_query("INSERT INTO {menu_custom} (menu_name, title, description) VALUES ('%s', '%s', '%s')", $menus['secondary-links']);
1935      }
1936  
1937      if ($updated_secondary_links_menu) {
1938        // Change the existing menu name to 'secondary-links'.
1939        $replace = array('%new_name' => 'secondary-links', '%desc' => $menus['secondary-links']['description'], '%old_name' => $_SESSION['menu_menu_map'][$updated_secondary_links_menu]);
1940        $ret[] = update_sql(strtr("UPDATE {menu_custom} SET menu_name = '%new_name', description = '%desc' WHERE menu_name = '%old_name'", $replace));
1941        $ret[] = update_sql("UPDATE {menu_links} SET menu_name = 'secondary-links' WHERE menu_name = '". $_SESSION['menu_menu_map'][$updated_secondary_links_menu] ."'");
1942        $_SESSION['menu_menu_map'][$updated_secondary_links_menu] = 'secondary-links';
1943      }
1944  
1945      // Update menu OTF preferences.
1946      $mid = variable_get('menu_parent_items', 0);
1947      $menu_name = ($mid && isset($_SESSION['menu_menu_map'][$mid])) ? $_SESSION['menu_menu_map'][$mid] : 'navigation';
1948      variable_set('menu_default_node_menu', $menu_name);
1949      variable_del('menu_parent_items');
1950  
1951      // Update the source of the primary and secondary links.
1952      $menu_name = ($menu_primary_menu && isset($_SESSION['menu_menu_map'][$menu_primary_menu])) ? $_SESSION['menu_menu_map'][$menu_primary_menu] : '';
1953      variable_set('menu_primary_links_source', $menu_name);
1954      variable_del('menu_primary_menu');
1955  
1956      $menu_name = ($menu_secondary_menu && isset($_SESSION['menu_menu_map'][$menu_secondary_menu])) ? $_SESSION['menu_menu_map'][$menu_secondary_menu] : '';
1957      variable_set('menu_secondary_links_source', $menu_name);
1958      variable_del('menu_secondary_menu');
1959  
1960      // Skip the navigation menu - it is handled by the user module.
1961      unset($_SESSION['menu_menu_map'][1]);
1962      // Update the deltas for all menu module blocks.
1963      foreach ($_SESSION['menu_menu_map'] as $mid => $menu_name) {
1964        // This is again secure because we deleted every non-alpanumeric
1965        // character from the menu name.
1966        $ret[] = update_sql("UPDATE {blocks} SET delta = '". $menu_name ."' WHERE module = 'menu' AND delta = '". $mid ."'");
1967        $ret[] = update_sql("UPDATE {blocks_roles} SET delta = '". $menu_name ."' WHERE module = 'menu' AND delta = '". $mid ."'");
1968      }
1969      $ret[] = array('success' => TRUE, 'query' => 'Relocated '. $_SESSION['system_update_6021'] .' existing items to the new menu system.');
1970      $ret[] = update_sql("DROP TABLE {menu}");
1971      unset($_SESSION['system_update_6021'], $_SESSION['system_update_6021_max'], $_SESSION['menu_menu_map'], $_SESSION['menu_item_map'], $_SESSION['menu_bogus_menus']);
1972      // Create the menu overview links - also calls menu_rebuild(). If menu is
1973      // disabled, then just call menu_rebuild.
1974      if (function_exists('menu_enable')) {
1975        menu_enable();
1976      }
1977      else {
1978        menu_rebuild();
1979      }
1980      $ret['#finished'] = 1;
1981    }
1982    else {
1983      $ret['#finished'] = $_SESSION['system_update_6021'] / $_SESSION['system_update_6021_max'];
1984    }
1985    return $ret;
1986  }
1987  
1988  /**
1989   * Update files tables to associate files to a uid by default instead of a nid.
1990   * Rename file_revisions to upload since it should only be used by the upload
1991   * module used by upload to link files to nodes.
1992   */
1993  function system_update_6022() {
1994    $ret = array();
1995  
1996    // Rename the nid field to vid, add status and timestamp fields, and indexes.
1997    db_drop_index($ret, 'files', 'nid');
1998    db_change_field($ret, 'files', 'nid', 'uid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
1999    db_add_field($ret, 'files', 'status', array('type' => 'int', 'not null' => TRUE, 'default' => 0));
2000    db_add_field($ret, 'files', 'timestamp', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
2001    db_add_index($ret, 'files', 'uid', array('uid'));
2002    db_add_index($ret, 'files', 'status', array('status'));
2003    db_add_index($ret, 'files', 'timestamp', array('timestamp'));
2004  
2005    // Rename the file_revisions table to upload then add nid column. Since we're
2006    // changing the table name we need to drop and re-add the indexes and
2007    // the primary key so both mysql and pgsql end up with the correct index
2008    // names.
2009    db_drop_primary_key($ret, 'file_revisions');
2010    db_drop_index($ret, 'file_revisions', 'vid');
2011    db_rename_table($ret, 'file_revisions', 'upload');
2012    db_add_field($ret, 'upload', 'nid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
2013    db_add_index($ret, 'upload', 'nid', array('nid'));
2014    db_add_primary_key($ret, 'upload', array('vid', 'fid'));
2015    db_add_index($ret, 'upload', 'fid', array('fid'));
2016  
2017    // The nid column was renamed to uid. Use the old nid to find the node's uid.
2018    update_sql('UPDATE {files} SET uid = (SELECT n.uid FROM {node} n WHERE {files}.uid = n.nid)');
2019    update_sql('UPDATE {upload} SET nid = (SELECT r.nid FROM {node_revisions} r WHERE {upload}.vid = r.vid)');
2020  
2021    // Mark all existing files as FILE_STATUS_PERMANENT.
2022    $ret[] = update_sql('UPDATE {files} SET status = 1');
2023  
2024    return $ret;
2025  }
2026  
2027  function system_update_6023() {
2028    $ret = array();
2029  
2030    // nid is DEFAULT 0
2031    db_drop_index($ret, 'node_revisions', 'nid');
2032    db_change_field($ret, 'node_revisions', 'nid', 'nid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
2033    db_add_index($ret, 'node_revisions', 'nid', array('nid'));
2034    return $ret;
2035  }
2036  
2037  /**
2038   * Add translation fields to nodes used by translation module.
2039   */
2040  function system_update_6024() {
2041    $ret = array();
2042    db_add_field($ret, 'node', 'tnid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
2043    db_add_field($ret, 'node', 'translate', array('type' => 'int', 'not null' => TRUE, 'default' => 0));
2044    db_add_index($ret, 'node', 'tnid', array('tnid'));
2045    db_add_index($ret, 'node', 'translate', array('translate'));
2046    return $ret;
2047  }
2048  
2049  /**
2050   * Increase the maximum length of node titles from 128 to 255.
2051   */
2052  function system_update_6025() {
2053    $ret = array();
2054    db_drop_index($ret, 'node', 'node_title_type');
2055    db_change_field($ret, 'node', 'title', 'title', array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''));
2056    db_add_index($ret, 'node', 'node_title_type', array('title', array('type', 4)));
2057    db_change_field($ret, 'node_revisions', 'title', 'title', array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''));
2058    return $ret;
2059  }
2060  
2061  /**
2062   * Display warning about new Update status module.
2063   */
2064  function system_update_6026() {
2065    $ret = array();
2066  
2067    // Notify user that new update module exists.
2068    drupal_set_message('Drupal can check periodically for important bug fixes and security releases using the new update status module. This module can be turned on from the <a href="'. url('admin/build/modules') .'">modules administration page</a>. For more information please read the <a href="http://drupal.org/handbook/modules/update">Update status handbook page</a>.');
2069  
2070    return $ret;
2071  }
2072  
2073  /**
2074   * Add block cache.
2075   */
2076  function system_update_6027() {
2077    $ret = array();
2078  
2079    // Create the blocks.cache column.
2080    db_add_field($ret, 'blocks', 'cache', array('type' => 'int', 'not null' => TRUE, 'default' => 1, 'size' => 'tiny'));
2081  
2082    // The cache_block table is created in update_fix_d6_requirements() since
2083    // calls to cache_clear_all() would otherwise cause warnings.
2084  
2085    // Fill in the values for the new 'cache' column in the {blocks} table.
2086    foreach (module_list() as $module) {
2087      if ($module_blocks = module_invoke($module, 'block', 'list')) {
2088        foreach ($module_blocks as $delta => $block) {
2089          if (isset($block['cache'])) {
2090            db_query("UPDATE {blocks} SET cache = %d WHERE module = '%s' AND delta = '%s'", $block['cache'], $module, $delta);
2091          }
2092        }
2093      }
2094    }
2095  
2096    return $ret;
2097  }
2098  
2099  /**
2100   * Add the node load cache table.
2101   */
2102  function system_update_6028() {
2103    // Removed node_load cache to discuss it more for Drupal 7.
2104    return array();
2105  }
2106  
2107  /**
2108   * Enable the dblog module on sites that upgrade, since otherwise
2109   * watchdog logging will stop unexpectedly.
2110   */
2111  function system_update_6029() {
2112    // The watchdog table is now owned by dblog, which is not yet
2113    // "installed" according to the system table, but the table already
2114    // exists.  We set the module as "installed" here to avoid an error
2115    // later.
2116    //
2117    // Although not the case for the initial D6 release, it is likely
2118    // that dblog.install will have its own update functions eventually.
2119    // However, dblog did not exist in D5 and this update is part of the
2120    // initial D6 release, so we know that dblog is not installed yet.
2121    // It is therefore correct to install it as version 0.  If
2122    // dblog updates exist, the next run of update.php will get them.
2123    drupal_set_installed_schema_version('dblog', 0);
2124    module_enable(array('dblog'));
2125    menu_rebuild();
2126    return array(array('success' => TRUE, 'query' => "'dblog' module enabled."));
2127  }
2128  
2129  /**
2130   * Add the tables required by actions.inc.
2131   */
2132  function system_update_6030() {
2133    $ret = array();
2134  
2135    // Rename the old contrib actions table if it exists so the contrib version
2136    // of the module can do something with the old data.
2137    if (db_table_exists('actions')) {
2138      db_rename_table($ret, 'actions', 'actions_old_contrib');
2139    }
2140  
2141    $schema['actions'] = array(
2142      'fields' => array(
2143        'aid' => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => '0'),
2144        'type' => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
2145        'callback' => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
2146        'parameters' => array('type' => 'text', 'not null' => TRUE, 'size' => 'big'),
2147        'description' => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => '0'),
2148      ),
2149      'primary key' => array('aid'),
2150    );
2151  
2152    $schema['actions_aid'] = array(
2153      'fields' => array(
2154        'aid' => array('type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE),
2155      ),
2156      'primary key' => array('aid'),
2157    );
2158  
2159    db_create_table($ret, 'actions', $schema['actions']);
2160    db_create_table($ret, 'actions_aid', $schema['actions_aid']);
2161  
2162    return $ret;
2163  }
2164  
2165  /**
2166   * Ensure that installer cannot be run again after updating from Drupal 5.x to 6.x
2167   * Actually, this is already done by system_update_6014(), so this is now a no-op.
2168   */
2169  function system_update_6031() {
2170    return array();
2171  }
2172  
2173  /**
2174   * profile_fields.name used to be nullable but is part of a unique key
2175   * and so shouldn't be.
2176   */
2177  function system_update_6032() {
2178    $ret = array();
2179    if (db_table_exists('profile_fields')) {
2180      db_drop_unique_key($ret, 'profile_fields', 'name');
2181      db_change_field($ret, 'profile_fields', 'name', 'name', array('type' => 'varchar', 'length' => 128, 'not null' => TRUE, 'default' => ''));
2182      db_add_unique_key($ret, 'profile_fields', 'name', array('name'));
2183    }
2184    return $ret;
2185  }
2186  
2187  /**
2188   * Change node_comment_statistics to be not autoincrement.
2189   */
2190  function system_update_6033() {
2191    $ret = array();
2192    if (db_table_exists('node_comment_statistics')) {
2193      // On pgsql but not mysql, db_change_field() drops all keys
2194      // involving the changed field, which in this case is the primary
2195      // key.  The normal approach is explicitly drop the pkey, change the
2196      // field, and re-create the pkey.
2197      //
2198      // Unfortunately, in this case that won't work on mysql; we CANNOT
2199      // drop the pkey because on mysql auto-increment fields must be
2200      // included in at least one key or index.
2201      //
2202      // Since we cannot drop the pkey before db_change_field(), after
2203      // db_change_field() we may or may not still have a pkey.  The
2204      // simple way out is to re-create the pkey only when using pgsql.
2205      // Realistic requirements trump idealistic purity.
2206      db_change_field($ret, 'node_comment_statistics', 'nid', 'nid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
2207      if ($GLOBALS['db_type'] == 'pgsql') {
2208        db_add_primary_key($ret, 'node_comment_statistics', array('nid'));
2209      }
2210    }
2211    return $ret;
2212  }
2213  
2214  /**
2215   * Rename permission "administer access control" to "administer permissions".
2216   */
2217  function system_update_6034() {
2218    $ret = array();
2219    $result = db_query("SELECT rid, perm FROM {permission} ORDER BY rid");
2220    while ($role = db_fetch_object($result)) {
2221      $renamed_permission = preg_replace('/administer access control/', 'administer permissions', $role->perm);
2222      if ($renamed_permission != $role->perm) {
2223        $ret[] = update_sql("UPDATE {permission} SET perm = '$renamed_permission' WHERE rid = $role->rid");
2224      }
2225    }
2226    return $ret;
2227  }
2228  
2229  /**
2230   * Change index on system table for better performance.
2231   */
2232  function system_update_6035() {
2233    $ret = array();
2234    db_drop_index($ret, 'system', 'weight');
2235    db_add_index($ret, 'system', 'modules', array(array('type', 12), 'status', 'weight', 'filename'));
2236    db_add_index($ret, 'system', 'bootstrap', array(array('type', 12), 'status', 'bootstrap', 'weight', 'filename'));
2237    return $ret;
2238  }
2239  
2240  /**
2241   * Change the search schema and indexing.
2242   *
2243   * The table data is preserved where possible in MYSQL and MYSQLi using
2244   * ALTER IGNORE. Other databases don't support that, so for them the
2245   * tables are dropped and re-created, and will need to be re-indexed
2246   * from scratch.
2247   */
2248  function system_update_6036() {
2249    $ret = array();
2250    if (db_table_exists('search_index')) {
2251      // Create the search_dataset.reindex column.
2252      db_add_field($ret, 'search_dataset', 'reindex', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
2253  
2254      // Drop the search_index.from fields which are no longer used.
2255      db_drop_index($ret, 'search_index', 'from_sid_type');
2256      db_drop_field($ret, 'search_index', 'fromsid');
2257      db_drop_field($ret, 'search_index', 'fromtype');
2258  
2259      // Drop the search_dataset.sid_type index, so that it can be made unique.
2260      db_drop_index($ret, 'search_dataset', 'sid_type');
2261  
2262      // Create the search_node_links Table.
2263      $search_node_links_schema = array(
2264        'fields' => array(
2265          'sid'      => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
2266          'type'     => array('type' => 'varchar', 'length' => 16, 'not null' => TRUE, 'default' => ''),
2267          'nid'      => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
2268          'caption'    => array('type' => 'text', 'size' => 'big', 'not null' => FALSE),
2269        ),
2270        'primary key' => array('sid', 'type', 'nid'),
2271        'indexes' => array('nid' => array('nid')),
2272      );
2273      db_create_table($ret, 'search_node_links', $search_node_links_schema);
2274  
2275      // with the change to search_dataset.reindex, the search queue is handled differently,
2276      // and this is no longer needed
2277      variable_del('node_cron_last');
2278  
2279      // Add a unique index for the search_index.
2280      if ($GLOBALS['db_type'] == 'mysql' || $GLOBALS['db_type'] == 'mysqli') {
2281        // Since it's possible that some existing sites have duplicates,
2282        // create the index using the IGNORE keyword, which ignores duplicate errors.
2283        // However, pgsql doesn't support it
2284        $ret[] = update_sql("ALTER IGNORE TABLE {search_index} ADD UNIQUE KEY word_sid_type (word, sid, type)");
2285        $ret[] = update_sql("ALTER IGNORE TABLE {search_dataset} ADD UNIQUE KEY sid_type (sid, type)");
2286  
2287        // Everything needs to be reindexed.
2288        $ret[] = update_sql("UPDATE {search_dataset} SET reindex = 1");
2289      }
2290      else {
2291        // Delete the existing tables if there are duplicate values
2292        if (db_result(db_query("SELECT sid FROM {search_dataset} GROUP BY sid, type HAVING COUNT(*) > 1")) || db_result(db_query("SELECT sid FROM {search_index} GROUP BY word, sid, type HAVING COUNT(*) > 1"))) {
2293          $ret[] = update_sql('DELETE FROM {search_dataset}');
2294          $ret[] = update_sql('DELETE FROM {search_index}');
2295          $ret[] = update_sql('DELETE FROM {search_total}');
2296        }
2297        else {
2298          // Everything needs to be reindexed.
2299          $ret[] = update_sql("UPDATE {search_dataset} SET reindex = 1");
2300        }
2301  
2302        // create the new indexes
2303        db_add_unique_key($ret, 'search_index', 'word_sid_type', array('word', 'sid', 'type'));
2304        db_add_unique_key($ret, 'search_dataset', 'sid_type', array('sid', 'type'));
2305      }
2306    }
2307    return $ret;
2308  }
2309  
2310  /**
2311   * Create consistent empty region for disabled blocks.
2312   */
2313  function system_update_6037() {
2314    $ret = array();
2315    db_change_field($ret, 'blocks', 'region', 'region', array('type' => 'varchar', 'length' => 64, 'not null' => TRUE, 'default' => ''));
2316    $ret[] = update_sql("UPDATE {blocks} SET region = '' WHERE status = 0");
2317    return $ret;
2318  }
2319  
2320  /**
2321   * Ensure that "Account" is not used as a Profile category.
2322   */
2323  function system_update_6038() {
2324    $ret = array();
2325    if (db_table_exists('profile_fields')) {
2326      $ret[] = update_sql("UPDATE {profile_fields} SET category = 'Account settings' WHERE LOWER(category) = 'account'");
2327      if ($affectedrows = db_affected_rows()) {
2328        drupal_set_message('There were '. $affectedrows .' profile fields that used a reserved category name. They have been assigned to the category "Account settings".');
2329      }
2330    }
2331    return $ret;
2332  }
2333  
2334  /**
2335   * Rename permissions "edit foo content" to "edit any foo content".
2336   * Also update poll module permission "create polls" to "create
2337   * poll content".
2338   */
2339  function system_update_6039() {
2340    $ret = array();
2341    $result = db_query("SELECT rid, perm FROM {permission} ORDER BY rid");
2342    while ($role = db_fetch_object($result)) {
2343      $renamed_permission = preg_replace('/(?<=^|,\ )edit\ ([a-zA-Z0-9_\-]+)\ content(?=,|$)/', 'edit any $1 content', $role->perm);
2344      $renamed_permission = preg_replace('/(?<=^|,\ )create\ polls(?=,|$)/', 'create poll content', $renamed_permission);
2345      if ($renamed_permission != $role->perm) {
2346        $ret[] = update_sql("UPDATE {permission} SET perm = '$renamed_permission' WHERE rid = $role->rid");
2347      }
2348    }
2349    return $ret;
2350  }
2351  
2352  /**
2353   * Add a weight column to the upload table.
2354   */
2355  function system_update_6040() {
2356    $ret = array();
2357    if (db_table_exists('upload')) {
2358      db_add_field($ret, 'upload', 'weight', array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'tiny'));
2359    }
2360    return $ret;
2361  }
2362  
2363  /**
2364   * Change forum vocabulary not to be required by default and set the weight of the forum.module 1 higher than the taxonomy.module.
2365   */
2366  function system_update_6041() {
2367    $weight = intval((db_result(db_query("SELECT weight FROM {system} WHERE name = 'taxonomy'"))) + 1);
2368    $ret = array();
2369    $vid = intval(variable_get('forum_nav_vocabulary', ''));
2370    if (db_table_exists('vocabulary') && $vid) {
2371      $ret[] = update_sql("UPDATE {vocabulary} SET required = 0 WHERE vid = " . $vid);
2372      $ret[] = update_sql("UPDATE {system} SET weight = ". $weight ." WHERE name = 'forum'");
2373    }
2374    return $ret;
2375  }
2376  
2377  /**
2378   * Upgrade recolored theme stylesheets to new array structure.
2379   */
2380  function system_update_6042() {
2381    foreach (list_themes() as $theme) {
2382      $stylesheet = variable_get('color_'. $theme->name .'_stylesheet', NULL);
2383      if (!empty($stylesheet)) {
2384        variable_set('color_'. $theme->name .'_stylesheets', array($stylesheet));
2385        variable_del('color_'. $theme->name .'_stylesheet');
2386      }
2387    }
2388    return array();
2389  }
2390  
2391  /**
2392   * Update table indices to make them more rational and useful.
2393   */
2394  function system_update_6043() {
2395    $ret = array();
2396    // Required modules first.
2397    // Add new system module indexes.
2398    db_add_index($ret, 'flood', 'allow', array('event', 'hostname', 'timestamp'));
2399    db_add_index($ret, 'history', 'nid', array('nid'));
2400    // Change length of theme field in {blocks} to be consistent with module, and
2401    // to avoid a MySQL error regarding a too-long index.  Also add new indices.
2402    db_change_field($ret, 'blocks', 'theme', 'theme', array('type' => 'varchar', 'length' => 64, 'not null' => TRUE, 'default' => ''),array(
2403                    'unique keys' => array('tmd' => array('theme', 'module', 'delta'),),
2404                    'indexes' => array('list' => array('theme', 'status', 'region', 'weight', 'module'),),));
2405    db_add_index($ret, 'blocks_roles', 'rid', array('rid'));
2406    // Improve filter module indices.
2407    db_drop_index($ret, 'filters', 'weight');
2408    db_add_unique_key($ret, 'filters', 'fmd', array('format', 'module', 'delta'));
2409    db_add_index($ret, 'filters', 'list', array('format', 'weight', 'module', 'delta'));
2410    // Drop unneeded keys form the node table.
2411    db_drop_index($ret, 'node', 'status');
2412    db_drop_unique_key($ret, 'node', 'nid_vid');
2413    // Improve user module indices.
2414    db_add_index($ret, 'users', 'mail', array('mail'));
2415    db_add_index($ret, 'users_roles', 'rid', array('rid'));
2416  
2417    // Optional modules - need to check if the tables exist.
2418    // Alter aggregator module's tables primary keys to make them more useful.
2419    if (db_table_exists('aggregator_category_feed')) {
2420      db_drop_primary_key($ret, 'aggregator_category_feed');
2421      db_add_primary_key($ret, 'aggregator_category_feed', array('cid', 'fid'));
2422      db_add_index($ret, 'aggregator_category_feed', 'fid', array('fid'));
2423    }
2424    if (db_table_exists('aggregator_category_item')) {
2425      db_drop_primary_key($ret, 'aggregator_category_item');
2426      db_add_primary_key($ret, 'aggregator_category_item', array('cid', 'iid'));
2427      db_add_index($ret, 'aggregator_category_item', 'iid', array('iid'));
2428    }
2429    // Alter contact module's table to add an index.
2430    if (db_table_exists('contact')) {
2431      db_add_index($ret, 'contact', 'list', array('weight', 'category'));
2432    }
2433    // Alter locale table to add a primary key, drop an index.
2434    if (db_table_exists('locales_target')) {
2435      db_add_primary_key($ret, 'locales_target', array('language', 'lid', 'plural'));
2436    }
2437    // Alter a poll module table to add a primary key.
2438    if (db_table_exists('poll_votes')) {
2439      db_drop_index($ret, 'poll_votes', 'nid');
2440      db_add_primary_key($ret, 'poll_votes', array('nid', 'uid', 'hostname'));
2441    }
2442    // Alter a profile module table to add a primary key.
2443    if (db_table_exists('profile_values')) {
2444      db_drop_index($ret, 'profile_values', 'uid');
2445      db_drop_index($ret, 'profile_values', 'fid');
2446      db_change_field($ret,'profile_values' ,'fid', 'fid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0,), array('indexes' => array('fid' => array('fid'),)));
2447      db_change_field($ret,'profile_values' ,'uid', 'uid', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0,));
2448      db_add_primary_key($ret, 'profile_values', array('uid', 'fid'));
2449    }
2450    // Alter a statistics module table to add an index.
2451    if (db_table_exists('accesslog')) {
2452      db_add_index($ret, 'accesslog', 'uid', array('uid'));
2453    }
2454    // Alter taxonomy module's tables.
2455    if (db_table_exists('term_data')) {
2456      db_drop_index($ret, 'term_data', 'vid');
2457      db_add_index($ret, 'term_data', 'vid_name', array('vid', 'name'));
2458      db_add_index($ret, 'term_data', 'taxonomy_tree', array('vid', 'weight', 'name'));
2459    }
2460    if (db_table_exists('term_node')) {
2461      db_drop_primary_key($ret, 'term_node');
2462      db_drop_index($ret, 'term_node', 'tid');
2463      db_add_primary_key($ret, 'term_node', array('tid', 'vid'));
2464    }
2465    if (db_table_exists('term_relation')) {
2466      db_drop_index($ret, 'term_relation', 'tid1');
2467      db_add_unique_key($ret, 'term_relation', 'tid1_tid2', array('tid1', 'tid2'));
2468    }
2469    if (db_table_exists('term_synonym')) {
2470      db_drop_index($ret, 'term_synonym', 'name');
2471      db_add_index($ret, 'term_synonym', 'name_tid', array('name', 'tid'));
2472    }
2473    if (db_table_exists('vocabulary')) {
2474      db_add_index($ret, 'vocabulary', 'list', array('weight', 'name'));
2475    }
2476    if (db_table_exists('vocabulary_node_types')) {
2477      db_drop_primary_key($ret, 'vocabulary_node_types');
2478      db_add_primary_key($ret, 'vocabulary_node_types', array('type', 'vid'));
2479      db_add_index($ret, 'vocabulary_node_types', 'vid', array('vid'));
2480    }
2481    // If we updated in RC1 or before ensure we don't update twice.
2482    variable_set('system_update_6043_RC2', TRUE);
2483  
2484    return $ret;
2485  }
2486  
2487  /**
2488   * RC1 to RC2 index cleanup.
2489   */
2490  function system_update_6044() {
2491    $ret = array();
2492  
2493    // Delete invalid entries in {term_node} after system_update_6001.
2494    $ret[] = update_sql("DELETE FROM {term_node} WHERE vid = 0");
2495  
2496    // Only execute the rest of this function if 6043 was run in RC1 or before.
2497    if (variable_get('system_update_6043_RC2', FALSE)) {
2498      variable_del('system_update_6043_RC2');
2499      return $ret;
2500    }
2501  
2502    // User module indices.
2503    db_drop_unique_key($ret, 'users', 'mail');
2504    db_add_index($ret, 'users', 'mail', array('mail'));
2505  
2506    // Optional modules - need to check if the tables exist.
2507    // Alter taxonomy module's tables.
2508    if (db_table_exists('term_data')) {
2509      db_drop_unique_key($ret, 'term_data', 'vid_name');
2510      db_add_index($ret, 'term_data', 'vid_name', array('vid', 'name'));
2511    }
2512    if (db_table_exists('term_synonym')) {
2513      db_drop_unique_key($ret, 'term_synonym', 'name_tid', array('name', 'tid'));
2514      db_add_index($ret, 'term_synonym', 'name_tid', array('name', 'tid'));
2515    }
2516  
2517    return $ret;
2518  }
2519  
2520  /**
2521   * Update blog, book and locale module permissions.
2522   *
2523   * Blog module got "edit own blog" replaced with the more granular "create
2524   * blog entries", "edit own blog entries" and "delete own blog entries"
2525   * permissions. We grant create and edit to previously privileged users, but
2526   * delete is not granted to be in line with other permission changes in Drupal 6.
2527   *
2528   * Book module's "edit book pages" was upgraded to the bogus "edit book content"
2529   * in Drupal 6 RC1 instead of "edit any book content", which would be correct.
2530   *
2531   * Locale module introduced "administer languages" and "translate interface"
2532   * in place of "administer locales".
2533   *
2534   * Modeled after system_update_6039().
2535   */
2536  function system_update_6045() {
2537    $ret = array();
2538    $result = db_query("SELECT rid, perm FROM {permission} ORDER BY rid");
2539    while ($role = db_fetch_object($result)) {
2540      $renamed_permission = preg_replace('/(?<=^|,\ )edit\ own\ blog(?=,|$)/', 'create blog entries, edit own blog entries', $role->perm);
2541      $renamed_permission = preg_replace('/(?<=^|,\ )edit\ book\ content(?=,|$)/', 'edit any book content', $renamed_permission);
2542      $renamed_permission = preg_replace('/(?<=^|,\ )administer\ locales(?=,|$)/', 'administer languages, translate interface', $renamed_permission);
2543      if ($renamed_permission != $role->perm) {
2544        $ret[] = update_sql("UPDATE {permission} SET perm = '$renamed_permission' WHERE rid = $role->rid");
2545      }
2546    }
2547  
2548    // Notify user that delete permissions may have been changed. This was in
2549    // effect since system_update_6039(), but there was no user notice.
2550    drupal_set_message('Drupal now has separate edit and delete permissions. Previously, users who were able to edit content were automatically allowed to delete it. For added security, delete permissions for individual core content types have been <strong>removed</strong> from all roles on your site (only roles with the "administer nodes" permission can now delete these types of content). If you would like to reenable any individual delete permissions, you can do this at the <a href="'. url('admin/user/permissions', array('fragment' => 'module-node')) .'">permissions page</a>.');
2551    return $ret;
2552  }
2553  
2554  /**
2555   * Ensure that the file_directory_path variable is set (using the old 5.x
2556   * default, if necessary), so that the changed 6.x default won't break
2557   * existing sites.
2558   */
2559  function system_update_6046() {
2560    $ret = array();
2561    if (!variable_get('file_directory_path', FALSE)) {
2562      variable_set('file_directory_path', 'files');
2563      $ret[] = array('success' => TRUE, 'query' => "variable_set('file_directory_path')");
2564    }
2565    return $ret;
2566  }
2567  
2568  /**
2569   * Fix cache mode for blocks inserted in system_install() in fresh installs of previous RC.
2570   */
2571  function system_update_6047() {
2572    $ret = array();
2573    $ret[] = update_sql("UPDATE {blocks} SET cache = -1 WHERE module = 'user' AND delta IN ('0', '1')");
2574    $ret[] = update_sql("UPDATE {blocks} SET cache = -1 WHERE module = 'system' AND delta = '0'");
2575    return $ret;
2576  }
2577  
2578  /**
2579   * @} End of "defgroup updates-5.x-to-6.x"
2580   */
2581  
2582  /**
2583   * @defgroup updates-6.x-extra Extra system updates for 6.x
2584   * @{
2585   */
2586  
2587  /**
2588  * Increase the size of the 'load_functions' and 'to_arg_functions' fields in table 'menu_router'.
2589  */
2590  function system_update_6048() {
2591    $ret = array();
2592    db_change_field($ret, 'menu_router', 'load_functions', 'load_functions', array('type' => 'text', 'not null' => TRUE,));
2593    db_change_field($ret, 'menu_router', 'to_arg_functions', 'to_arg_functions', array('type' => 'text', 'not null' => TRUE,));
2594  
2595    return $ret;
2596  }
2597  
2598  /**
2599   * Replace src index on the {url_alias} table with src, language.
2600   */
2601  function system_update_6049() {
2602    $ret = array();
2603    db_drop_index($ret, 'url_alias', 'src');
2604    db_add_index($ret, 'url_alias', 'src_language', array('src', 'language'));
2605    return $ret;
2606  }
2607  
2608  /**
2609   * Clear any menu router blobs stored in the cache table.
2610   */
2611  function system_update_6050() {
2612    $ret = array();
2613    cache_clear_all('router:', 'cache_menu', TRUE);
2614    return $ret;
2615  }
2616  
2617  /**
2618   * Create a signature_format column.
2619   */
2620  function system_update_6051() {
2621    $ret = array();
2622  
2623    if (!db_column_exists('users', 'signature_format')) {
2624  
2625      // Set future input formats to FILTER_FORMAT_DEFAULT to ensure a safe default
2626      // when incompatible modules insert into the users table. An actual format
2627      // will be assigned when users save their signature.
2628  
2629      $schema = array(
2630        'type' => 'int',
2631        'size' => 'small',
2632        'not null' => TRUE,
2633        'default' => FILTER_FORMAT_DEFAULT,
2634        'description' => 'The {filter_formats}.format of the signature.',
2635      );
2636  
2637      db_add_field($ret, 'users', 'signature_format', $schema);
2638  
2639      // Set the format of existing signatures to the current default input format.
2640      if ($current_default_filter = variable_get('filter_default_format', 0)) {
2641        $ret[] = update_sql("UPDATE {users} SET signature_format = ". $current_default_filter);
2642      }
2643  
2644      drupal_set_message("User signatures no longer inherit comment input formats. Each user's signature now has its own associated format that can be selected on the user's account page. Existing signatures have been set to your site's default input format.");
2645    }
2646  
2647    return $ret;
2648  }
2649  
2650  /**
2651   * Add a missing index on the {menu_router} table.
2652   */
2653  function system_update_6052() {
2654    $ret = array();
2655    db_add_index($ret, 'menu_router', 'tab_root_weight_title', array(array('tab_root', 64), 'weight', 'title'));
2656    return $ret;
2657  }
2658  
2659  /**
2660   * Add a {system} index on type and name.
2661   */
2662  function system_update_6053() {
2663    $ret = array();
2664    db_add_index($ret, 'system', 'type_name', array(array('type', 12), 'name'));
2665    return $ret;
2666  }
2667  
2668  /**
2669   * Add semaphore table.
2670   */
2671  function system_update_6054() {
2672    $ret = array();
2673  
2674    // The table may have already been added by update_fix_d6_requirements(), so
2675    // check for its existence before creating.
2676    if (!db_table_exists('semaphore')) {
2677      $schema['semaphore'] = array(
2678        'fields' => array(
2679          'name' => array(
2680            'type' => 'varchar',
2681            'length' => 255,
2682            'not null' => TRUE,
2683            'default' => ''),
2684          'value' => array(
2685            'type' => 'varchar',
2686            'length' => 255,
2687            'not null' => TRUE,
2688            'default' => ''),
2689          'expire' => array(
2690            'type' => 'float',
2691            'size' => 'big',
2692            'not null' => TRUE),
2693          ),
2694        'indexes' => array('expire' => array('expire')),
2695        'primary key' => array('name'),
2696      );
2697      db_create_table($ret, 'semaphore', $schema['semaphore']);
2698    }
2699  
2700    return $ret;
2701  }
2702  
2703  /**
2704   * Improve indexes on the {url_alias} table.
2705   */
2706  function system_update_6055() {
2707    $ret = array();
2708    db_drop_index($ret, 'url_alias', 'src_language');
2709    db_drop_unique_key($ret, 'url_alias', 'dst_language');
2710    db_add_index($ret, 'url_alias', 'src_language_pid', array('src', 'language', 'pid'));
2711    db_add_unique_key($ret, 'url_alias', 'dst_language_pid', array('dst', 'language', 'pid'));
2712    return $ret;
2713  }
2714  
2715  /**
2716   * @} End of "defgroup updates-6.x-extra"
2717   * The next series of updates should start at 7000.
2718   */
2719