includes/installer/DatabaseUpdater.php

   1 <?php
   2 /**
   3  * DBMS-specific updater helper.
   4  *
   5  * @file
   6  * @ingroup Deployment
   7  */
   8
   9 require_once( dirname(__FILE__) . '/../../maintenance/Maintenance.php' );
  10
  11 /**
  12  * Class for handling database updates. Roughly based off of updaters.inc, with
  13  * a few improvements :)
  14  *
  15  * @ingroup Deployment
  16  * @since 1.17
  17  */
  18 abstract class DatabaseUpdater {
  19
  20         /**
  21          * Array of updates to perform on the database
  22          *
  23          * @var array
  24          */
  25         protected $updates = array();
  26
  27         /**
  28          * List of extension-provided database updates
  29          * @var array
  30          */
  31         protected $extensionUpdates = array();
  32
  33         /**
  34          * Handle to the database subclass
  35          *
  36          * @var DatabaseBase
  37          */
  38         protected $db;
  39
  40         protected $shared = false;
  41
  42         protected $postDatabaseUpdateMaintenance = array(
  43                 'DeleteDefaultMessages',
  44                 'PopulateRevisionLength',
  45                 'PopulateRevisionSha1',
  46                 'PopulateImageSha1',
  47                 'FixExtLinksProtocolRelative',
  48         );
  49
  50         /**
  51          * Constructor
  52          *
  53          * @param $db DatabaseBase object to perform updates on
  54          * @param $shared bool Whether to perform updates on shared tables
  55          * @param $maintenance Maintenance Maintenance object which created us
  56          */
  57         protected function __construct( DatabaseBase &$db, $shared, Maintenance $maintenance = null ) {
  58                 $this->db = $db;
  59                 $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
  60                 $this->shared = $shared;
  61                 if ( $maintenance ) {
  62                         $this->maintenance = $maintenance;
  63                 } else {
  64                         $this->maintenance = new FakeMaintenance;
  65                 }
  66                 $this->maintenance->setDB( $db );
  67                 $this->initOldGlobals();
  68                 $this->loadExtensions();
  69                 wfRunHooks( 'LoadExtensionSchemaUpdates', array( $this ) );
  70         }
  71
  72         /**
  73          * Initialize all of the old globals. One day this should all become
  74          * something much nicer
  75          */
  76         private function initOldGlobals() {
  77                 global $wgExtNewTables, $wgExtNewFields, $wgExtPGNewFields,
  78                         $wgExtPGAlteredFields, $wgExtNewIndexes, $wgExtModifiedFields;
  79
  80                 # For extensions only, should be populated via hooks
  81                 # $wgDBtype should be checked to specifiy the proper file
  82                 $wgExtNewTables = array(); // table, dir
  83                 $wgExtNewFields = array(); // table, column, dir
  84                 $wgExtPGNewFields = array(); // table, column, column attributes; for PostgreSQL
  85                 $wgExtPGAlteredFields = array(); // table, column, new type, conversion method; for PostgreSQL
  86                 $wgExtNewIndexes = array(); // table, index, dir
  87                 $wgExtModifiedFields = array(); // table, index, dir
  88         }
  89
  90         /**
  91          * Loads LocalSettings.php, if needed, and initialises everything needed for LoadExtensionSchemaUpdates hook
  92          */
  93         private function loadExtensions() {
  94                 if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
  95                         return; // already loaded
  96                 }
  97                 $vars = Installer::getExistingLocalSettings();
  98                 if ( !$vars ) {
  99                         return; // no LocalSettings found
 100                 }
 101                 if ( !isset( $vars['wgHooks'] ) || !isset( $vars['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
 102                         return;
 103                 }
 104                 global $wgHooks, $wgAutoloadClasses;
 105                 $wgHooks['LoadExtensionSchemaUpdates'] = $vars['wgHooks']['LoadExtensionSchemaUpdates'];
 106                 $wgAutoloadClasses = $wgAutoloadClasses + $vars['wgAutoloadClasses'];
 107         }
 108
 109         /**
 110          * @throws MWException
 111          * @param DatabaseBase $db
 112          * @param bool $shared
 113          * @param null $maintenance
 114          * @return DatabaseUpdater
 115          */
 116         public static function newForDB( &$db, $shared = false, $maintenance = null ) {
 117                 $type = $db->getType();
 118                 if( in_array( $type, Installer::getDBTypes() ) ) {
 119                         $class = ucfirst( $type ) . 'Updater';
 120                         return new $class( $db, $shared, $maintenance );
 121                 } else {
 122                         throw new MWException( __METHOD__ . ' called for unsupported $wgDBtype' );
 123                 }
 124         }
 125
 126         /**
 127          * Get a database connection to run updates
 128          *
 129          * @return DatabaseBase
 130          */
 131         public function getDB() {
 132                 return $this->db;
 133         }
 134
 135         /**
 136          * Output some text. If we're running from web, escape the text first.
 137          *
 138          * @param $str String: Text to output
 139          */
 140         public function output( $str ) {
 141                 if ( $this->maintenance->isQuiet() ) {
 142                         return;
 143                 }
 144                 global $wgCommandLineMode;
 145                 if( !$wgCommandLineMode ) {
 146                         $str = htmlspecialchars( $str );
 147                 }
 148                 echo $str;
 149                 flush();
 150         }
 151
 152         /**
 153          * Add a new update coming from an extension. This should be called by
 154          * extensions while executing the LoadExtensionSchemaUpdates hook.
 155          *
 156          * @param $update Array: the update to run. Format is the following:
 157          *                first item is the callback function, it also can be a
 158          *                simple string with the name of a function in this class,
 159          *                following elements are parameters to the function.
 160          *                Note that callback functions will receive this object as
 161          *                first parameter.
 162          */
 163         public function addExtensionUpdate( Array $update ) {
 164                 $this->extensionUpdates[] = $update;
 165         }
 166
 167         /**
 168          * Convenience wrapper for addExtensionUpdate() when adding a new table (which
 169          * is the most common usage of updaters in an extension)
 170          * @param $tableName String Name of table to create
 171          * @param $sqlPath String Full path to the schema file
 172          */
 173         public function addExtensionTable( $tableName, $sqlPath ) {
 174                 $this->extensionUpdates[] = array( 'addTable', $tableName, $sqlPath, true );
 175         }
 176
 177         /**
 178          * @param $tableName string
 179          * @param $indexName string
 180          * @param $sqlPath string
 181          */
 182         public function addExtensionIndex( $tableName, $indexName, $sqlPath ) {
 183                 $this->extensionUpdates[] = array( 'addIndex', $tableName, $indexName, $sqlPath, true );
 184         }
 185
 186         /**
 187          * @param $tableName string
 188          * @param $columnName string
 189          * @param $sqlPath string
 190          */
 191         public function addExtensionField( $tableName, $columnName, $sqlPath ) {
 192                 $this->extensionUpdates[] = array( 'addField', $tableName, $columnName, $sqlPath, true );
 193         }
 194
 195         /**
 196          * Add a maintenance script to be run after the database updates are complete
 197          * @param $class string Name of a Maintenance subclass
 198          */
 199         public function addPostDatabaseUpdateMaintenance( $class ) {
 200                 $this->postDatabaseUpdateMaintenance[] = $class;
 201         }
 202
 203         /**
 204          * Get the list of extension-defined updates
 205          *
 206          * @return Array
 207          */
 208         protected function getExtensionUpdates() {
 209                 return $this->extensionUpdates;
 210         }
 211
 212         /**
 213          * @return array
 214          */
 215         public function getPostDatabaseUpdateMaintenance() {
 216                 return $this->postDatabaseUpdateMaintenance;
 217         }
 218
 219         /**
 220          * Do all the updates
 221          *
 222          * @param $what Array: what updates to perform
 223          */
 224         public function doUpdates( $what = array( 'core', 'extensions', 'purge', 'stats' ) ) {
 225                 global $wgVersion;
 226
 227                 $what = array_flip( $what );
 228                 if ( isset( $what['core'] ) ) {
 229                         $this->runUpdates( $this->getCoreUpdateList(), false );
 230                 }
 231                 if ( isset( $what['extensions'] ) ) {
 232                         $this->runUpdates( $this->getOldGlobalUpdates(), false );
 233                         $this->runUpdates( $this->getExtensionUpdates(), true );
 234                 }
 235
 236                 $this->setAppliedUpdates( $wgVersion, $this->updates );
 237
 238                 if( isset( $what['purge'] ) ) {
 239                         $this->purgeCache();
 240                         $this->rebuildLocalisationCache();
 241                 }
 242                 if ( isset( $what['stats'] ) ) {
 243                         $this->checkStats();
 244                 }
 245         }
 246
 247         /**
 248          * Helper function for doUpdates()
 249          *
 250          * @param $updates Array of updates to run
 251          * @param $passSelf Boolean: whether to pass this object we calling external
 252          *                  functions
 253          */
 254         private function runUpdates( array $updates, $passSelf ) {
 255                 foreach ( $updates as $params ) {
 256                         $func = array_shift( $params );
 257                         if( !is_array( $func ) && method_exists( $this, $func ) ) {
 258                                 $func = array( $this, $func );
 259                         } elseif ( $passSelf ) {
 260                                 array_unshift( $params, $this );
 261                         }
 262                         call_user_func_array( $func, $params );
 263                         flush();
 264                 }
 265                 $this->updates = array_merge( $this->updates, $updates );
 266         }
 267
 268         /**
 269          * @param $version
 270          * @param $updates array
 271          */
 272         protected function setAppliedUpdates( $version, $updates = array() ) {
 273                 $this->db->clearFlag( DBO_DDLMODE );
 274                 if( !$this->canUseNewUpdatelog() ) {
 275                         return;
 276                 }
 277                 $key = "updatelist-$version-" . time();
 278                 $this->db->insert( 'updatelog',
 279                         array( 'ul_key' => $key, 'ul_value' => serialize( $updates ) ),
 280                          __METHOD__ );
 281                 $this->db->setFlag( DBO_DDLMODE );
 282         }
 283
 284         /**
 285          * Helper function: check if the given key is present in the updatelog table.
 286          * Obviously, only use this for updates that occur after the updatelog table was
 287          * created!
 288          * @param $key String Name of the key to check for
 289          *
 290          * @return bool
 291          */
 292         public function updateRowExists( $key ) {
 293                 $row = $this->db->selectRow(
 294                         'updatelog',
 295                         '1',
 296                         array( 'ul_key' => $key ),
 297                         __METHOD__
 298                 );
 299                 return (bool)$row;
 300         }
 301
 302         /**
 303          * Helper function: Add a key to the updatelog table
 304          * Obviously, only use this for updates that occur after the updatelog table was
 305          * created!
 306          * @param $key String Name of key to insert
 307          * @param $val String [optional] value to insert along with the key
 308          */
 309         public function insertUpdateRow( $key, $val = null ) {
 310                 $this->db->clearFlag( DBO_DDLMODE );
 311                 $values = array( 'ul_key' => $key );
 312                 if( $val && $this->canUseNewUpdatelog() ) {
 313                         $values['ul_value'] = $val;
 314                 }
 315                 $this->db->insert( 'updatelog', $values, __METHOD__, 'IGNORE' );
 316                 $this->db->setFlag( DBO_DDLMODE );
 317         }
 318
 319         /**
 320          * Updatelog was changed in 1.17 to have a ul_value column so we can record
 321          * more information about what kind of updates we've done (that's what this
 322          * class does). Pre-1.17 wikis won't have this column, and really old wikis
 323          * might not even have updatelog at all
 324          *
 325          * @return boolean
 326          */
 327         protected function canUseNewUpdatelog() {
 328                 return $this->db->tableExists( 'updatelog', __METHOD__ ) &&
 329                         $this->db->fieldExists( 'updatelog', 'ul_value', __METHOD__ );
 330         }
 331
 332         /**
 333          * Before 1.17, we used to handle updates via stuff like
 334          * $wgExtNewTables/Fields/Indexes. This is nasty :) We refactored a lot
 335          * of this in 1.17 but we want to remain back-compatible for a while. So
 336          * load up these old global-based things into our update list.
 337          *
 338          * @return array
 339          */
 340         protected function getOldGlobalUpdates() {
 341                 global $wgExtNewFields, $wgExtNewTables, $wgExtModifiedFields,
 342                         $wgExtNewIndexes, $wgSharedDB, $wgSharedTables;
 343
 344                 $doUser = $this->shared ?
 345                         $wgSharedDB && in_array( 'user', $wgSharedTables ) :
 346                         !$wgSharedDB || !in_array( 'user', $wgSharedTables );
 347
 348                 $updates = array();
 349
 350                 foreach ( $wgExtNewTables as $tableRecord ) {
 351                         $updates[] = array(
 352                                 'addTable', $tableRecord[0], $tableRecord[1], true
 353                         );
 354                 }
 355
 356                 foreach ( $wgExtNewFields as $fieldRecord ) {
 357                         if ( $fieldRecord[0] != 'user' || $doUser ) {
 358                                 $updates[] = array(
 359                                         'addField', $fieldRecord[0], $fieldRecord[1],
 360                                                 $fieldRecord[2], true
 361                                 );
 362                         }
 363                 }
 364
 365                 foreach ( $wgExtNewIndexes as $fieldRecord ) {
 366                         $updates[] = array(
 367                                 'addIndex', $fieldRecord[0], $fieldRecord[1],
 368                                         $fieldRecord[2], true
 369                         );
 370                 }
 371
 372                 foreach ( $wgExtModifiedFields as $fieldRecord ) {
 373                         $updates[] = array(
 374                                 'modifyField', $fieldRecord[0], $fieldRecord[1],
 375                                         $fieldRecord[2], true
 376                         );
 377                 }
 378
 379                 return $updates;
 380         }
 381
 382         /**
 383          * Get an array of updates to perform on the database. Should return a
 384          * multi-dimensional array. The main key is the MediaWiki version (1.12,
 385          * 1.13...) with the values being arrays of updates, identical to how
 386          * updaters.inc did it (for now)
 387          *
 388          * @return Array
 389          */
 390         protected abstract function getCoreUpdateList();
 391
 392         /**
 393          * Applies a SQL patch
 394          * @param $path String Path to the patch file
 395          * @param $isFullPath Boolean Whether to treat $path as a relative or not
 396          */
 397         protected function applyPatch( $path, $isFullPath = false ) {
 398                 if ( $isFullPath ) {
 399                         $this->db->sourceFile( $path );
 400                 } else {
 401                         $this->db->sourceFile( $this->db->patchPath( $path ) );
 402                 }
 403         }
 404
 405         /**
 406          * Add a new table to the database
 407          * @param $name String Name of the new table
 408          * @param $patch String Path to the patch file
 409          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 410          */
 411         protected function addTable( $name, $patch, $fullpath = false ) {
 412                 if ( $this->db->tableExists( $name, __METHOD__ ) ) {
 413                         $this->output( "...$name table already exists.\n" );
 414                 } else {
 415                         $this->output( "Creating $name table..." );
 416                         $this->applyPatch( $patch, $fullpath );
 417                         $this->output( "ok\n" );
 418                 }
 419         }
 420
 421         /**
 422          * Add a new field to an existing table
 423          * @param $table String Name of the table to modify
 424          * @param $field String Name of the new field
 425          * @param $patch String Path to the patch file
 426          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 427          */
 428         protected function addField( $table, $field, $patch, $fullpath = false ) {
 429                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 430                         $this->output( "...$table table does not exist, skipping new field patch\n" );
 431                 } elseif ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 432                         $this->output( "...have $field field in $table table.\n" );
 433                 } else {
 434                         $this->output( "Adding $field field to table $table..." );
 435                         $this->applyPatch( $patch, $fullpath );
 436                         $this->output( "ok\n" );
 437                 }
 438         }
 439
 440         /**
 441          * Add a new index to an existing table
 442          * @param $table String Name of the table to modify
 443          * @param $index String Name of the new index
 444          * @param $patch String Path to the patch file
 445          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 446          */
 447         protected function addIndex( $table, $index, $patch, $fullpath = false ) {
 448                 if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 449                         $this->output( "...$index key already set on $table table.\n" );
 450                 } else {
 451                         $this->output( "Adding $index key to table $table... " );
 452                         $this->applyPatch( $patch, $fullpath );
 453                         $this->output( "ok\n" );
 454                 }
 455         }
 456
 457         /**
 458          * Drop a field from an existing table
 459          *
 460          * @param $table String Name of the table to modify
 461          * @param $field String Name of the old field
 462          * @param $patch String Path to the patch file
 463          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 464          */
 465         protected function dropField( $table, $field, $patch, $fullpath = false ) {
 466                 if ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 467                         $this->output( "Table $table contains $field field. Dropping... " );
 468                         $this->applyPatch( $patch, $fullpath );
 469                         $this->output( "ok\n" );
 470                 } else {
 471                         $this->output( "...$table table does not contain $field field.\n" );
 472                 }
 473         }
 474
 475         /**
 476          * Drop an index from an existing table
 477          *
 478          * @param $table String: Name of the table to modify
 479          * @param $index String: Name of the old index
 480          * @param $patch String: Path to the patch file
 481          * @param $fullpath Boolean: Whether to treat $patch path as a relative or not
 482          */
 483         protected function dropIndex( $table, $index, $patch, $fullpath = false ) {
 484                 if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 485                         $this->output( "Dropping $index key from table $table... " );
 486                         $this->applyPatch( $patch, $fullpath );
 487                         $this->output( "ok\n" );
 488                 } else {
 489                         $this->output( "...$index key doesn't exist.\n" );
 490                 }
 491         }
 492
 493         /**
 494          * @param $table string
 495          * @param $patch string
 496          * @param $fullpath bool
 497          */
 498         protected function dropTable( $table, $patch, $fullpath = false ) {
 499                 if ( $this->db->tableExists( $table, __METHOD__ ) ) {
 500                         $this->output( "Dropping table $table... " );
 501                         $this->applyPatch( $patch, $fullpath );
 502                         $this->output( "ok\n" );
 503                 } else {
 504                         $this->output( "...$table doesn't exist.\n" );
 505                 }
 506         }
 507
 508         /**
 509          * Modify an existing field
 510          *
 511          * @param $table String: name of the table to which the field belongs
 512          * @param $field String: name of the field to modify
 513          * @param $patch String: path to the patch file
 514          * @param $fullpath Boolean: whether to treat $patch path as a relative or not
 515          */
 516         public function modifyField( $table, $field, $patch, $fullpath = false ) {
 517                 $updateKey = "$table-$field-$patch";
 518                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 519                         $this->output( "...$table table does not exist, skipping modify field patch\n" );
 520                 } elseif ( !$this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 521                         $this->output( "...$field field does not exist in $table table, skipping modify field patch\n" );
 522                 } elseif( $this->updateRowExists( $updateKey ) ) {
 523                         $this->output( "...$field in table $table already modified by patch $patch\n" );
 524                 } else {
 525                         $this->output( "Modifying $field field of table $table..." );
 526                         $this->applyPatch( $patch, $fullpath );
 527                         $this->insertUpdateRow( $updateKey );
 528                         $this->output( "ok\n" );
 529                 }
 530         }
 531
 532         /**
 533          * Purge the objectcache table
 534          */
 535         protected function purgeCache() {
 536                 # We can't guarantee that the user will be able to use TRUNCATE,
 537                 # but we know that DELETE is available to us
 538                 $this->output( "Purging caches..." );
 539                 $this->db->delete( 'objectcache', '*', __METHOD__ );
 540                 $this->output( "done.\n" );
 541         }
 542
 543         /**
 544          * Check the site_stats table is not properly populated.
 545          */
 546         protected function checkStats() {
 547                 $this->output( "Checking site_stats row..." );
 548                 $row = $this->db->selectRow( 'site_stats', '*', array( 'ss_row_id' => 1 ), __METHOD__ );
 549                 if ( $row === false ) {
 550                         $this->output( "data is missing! rebuilding...\n" );
 551                 } elseif ( isset( $row->site_stats ) && $row->ss_total_pages == -1 ) {
 552                         $this->output( "missing ss_total_pages, rebuilding...\n" );
 553                 } else {
 554                         $this->output( "done.\n" );
 555                         return;
 556                 }
 557                 SiteStatsInit::doAllAndCommit( $this->db );
 558         }
 559
 560         # Common updater functions
 561
 562         /**
 563          * Sets the number of active users in the site_stats table
 564          */
 565         protected function doActiveUsersInit() {
 566                 $activeUsers = $this->db->selectField( 'site_stats', 'ss_active_users', false, __METHOD__ );
 567                 if ( $activeUsers == -1 ) {
 568                         $activeUsers = $this->db->selectField( 'recentchanges',
 569                                 'COUNT( DISTINCT rc_user_text )',
 570                                 array( 'rc_user != 0', 'rc_bot' => 0, "rc_log_type != 'newusers'" ), __METHOD__
 571                         );
 572                         $this->db->update( 'site_stats',
 573                                 array( 'ss_active_users' => intval( $activeUsers ) ),
 574                                 array( 'ss_row_id' => 1 ), __METHOD__, array( 'LIMIT' => 1 )
 575                         );
 576                 }
 577                 $this->output( "...ss_active_users user count set...\n" );
 578         }
 579
 580         /**
 581          * Populates the log_user_text field in the logging table
 582          */
 583         protected function doLogUsertextPopulation() {
 584                 if ( !$this->updateRowExists( 'populate log_usertext' ) ) {
 585                         $this->output(
 586                         "Populating log_user_text field, printing progress markers. For large\n" .
 587                         "databases, you may want to hit Ctrl-C and do this manually with\n" .
 588                         "maintenance/populateLogUsertext.php.\n" );
 589
 590                         $task = $this->maintenance->runChild( 'PopulateLogUsertext' );
 591                         $task->execute();
 592                 }
 593         }
 594
 595         /**
 596          * Migrate log params to new table and index for searching
 597          */
 598         protected function doLogSearchPopulation() {
 599                 if ( !$this->updateRowExists( 'populate log_search' ) ) {
 600                         $this->output(
 601                                 "Populating log_search table, printing progress markers. For large\n" .
 602                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
 603                                 "maintenance/populateLogSearch.php.\n" );
 604
 605                         $task = $this->maintenance->runChild( 'PopulateLogSearch' );
 606                         $task->execute();
 607                 }
 608         }
 609
 610         /**
 611          * Updates the timestamps in the transcache table
 612          */
 613         protected function doUpdateTranscacheField() {
 614                 if ( $this->updateRowExists( 'convert transcache field' ) ) {
 615                         $this->output( "...transcache tc_time already converted.\n" );
 616                         return;
 617                 }
 618
 619                 $this->output( "Converting tc_time from UNIX epoch to MediaWiki timestamp... " );
 620                 $this->applyPatch( 'patch-tc-timestamp.sql' );
 621                 $this->output( "ok\n" );
 622         }
 623
 624         /**
 625          * Update CategoryLinks collation
 626          */
 627         protected function doCollationUpdate() {
 628                 global $wgCategoryCollation;
 629                 if ( $this->db->selectField(
 630                         'categorylinks',
 631                         'COUNT(*)',
 632                         'cl_collation != ' . $this->db->addQuotes( $wgCategoryCollation ),
 633                         __METHOD__
 634                 ) == 0 ) {
 635                         $this->output( "...collations up-to-date.\n" );
 636                         return;
 637                 }
 638
 639                 $task = $this->maintenance->runChild( 'UpdateCollation' );
 640                 $task->execute();
 641         }
 642
 643         /**
 644          * Migrates user options from the user table blob to user_properties
 645          */
 646         protected function doMigrateUserOptions() {
 647                 $cl = $this->maintenance->runChild( 'ConvertUserOptions', 'convertUserOptions.php' );
 648                 $this->output( "Migrating remaining user_options... " );
 649                 $cl->execute();
 650                 $this->output( "done.\n" );
 651         }
 652
 653         /**
 654          * Rebuilds the localisation cache
 655          */
 656         protected function rebuildLocalisationCache() {
 657                 /**
 658                  * @var $cl RebuildLocalisationCache
 659                  */
 660                 $cl = $this->maintenance->runChild( 'RebuildLocalisationCache', 'rebuildLocalisationCache.php' );
 661                 $this->output( "Rebuilding localisation cache...\n" );
 662                 $cl->setForce();
 663                 $cl->execute();
 664                 $this->output( "Rebuilding localisation cache done.\n" );
 665         }
 666 }