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                 }
 241                 if ( isset( $what['stats'] ) ) {
 242                         $this->checkStats();
 243                 }
 244         }
 245
 246         /**
 247          * Helper function for doUpdates()
 248          *
 249          * @param $updates Array of updates to run
 250          * @param $passSelf Boolean: whether to pass this object we calling external
 251          *                  functions
 252          */
 253         private function runUpdates( array $updates, $passSelf ) {
 254                 foreach ( $updates as $params ) {
 255                         $func = array_shift( $params );
 256                         if( !is_array( $func ) && method_exists( $this, $func ) ) {
 257                                 $func = array( $this, $func );
 258                         } elseif ( $passSelf ) {
 259                                 array_unshift( $params, $this );
 260                         }
 261                         call_user_func_array( $func, $params );
 262                         flush();
 263                 }
 264                 $this->updates = array_merge( $this->updates, $updates );
 265         }
 266
 267         /**
 268          * @param $version
 269          * @param $updates array
 270          */
 271         protected function setAppliedUpdates( $version, $updates = array() ) {
 272                 $this->db->clearFlag( DBO_DDLMODE );
 273                 if( !$this->canUseNewUpdatelog() ) {
 274                         return;
 275                 }
 276                 $key = "updatelist-$version-" . time();
 277                 $this->db->insert( 'updatelog',
 278                         array( 'ul_key' => $key, 'ul_value' => serialize( $updates ) ),
 279                          __METHOD__ );
 280                 $this->db->setFlag( DBO_DDLMODE );
 281         }
 282
 283         /**
 284          * Helper function: check if the given key is present in the updatelog table.
 285          * Obviously, only use this for updates that occur after the updatelog table was
 286          * created!
 287          * @param $key String Name of the key to check for
 288          *
 289          * @return bool
 290          */
 291         public function updateRowExists( $key ) {
 292                 $row = $this->db->selectRow(
 293                         'updatelog',
 294                         '1',
 295                         array( 'ul_key' => $key ),
 296                         __METHOD__
 297                 );
 298                 return (bool)$row;
 299         }
 300
 301         /**
 302          * Helper function: Add a key to the updatelog table
 303          * Obviously, only use this for updates that occur after the updatelog table was
 304          * created!
 305          * @param $key String Name of key to insert
 306          * @param $val String [optional] value to insert along with the key
 307          */
 308         public function insertUpdateRow( $key, $val = null ) {
 309                 $this->db->clearFlag( DBO_DDLMODE );
 310                 $values = array( 'ul_key' => $key );
 311                 if( $val && $this->canUseNewUpdatelog() ) {
 312                         $values['ul_value'] = $val;
 313                 }
 314                 $this->db->insert( 'updatelog', $values, __METHOD__, 'IGNORE' );
 315                 $this->db->setFlag( DBO_DDLMODE );
 316         }
 317
 318         /**
 319          * Updatelog was changed in 1.17 to have a ul_value column so we can record
 320          * more information about what kind of updates we've done (that's what this
 321          * class does). Pre-1.17 wikis won't have this column, and really old wikis
 322          * might not even have updatelog at all
 323          *
 324          * @return boolean
 325          */
 326         protected function canUseNewUpdatelog() {
 327                 return $this->db->tableExists( 'updatelog', __METHOD__ ) &&
 328                         $this->db->fieldExists( 'updatelog', 'ul_value', __METHOD__ );
 329         }
 330
 331         /**
 332          * Before 1.17, we used to handle updates via stuff like
 333          * $wgExtNewTables/Fields/Indexes. This is nasty :) We refactored a lot
 334          * of this in 1.17 but we want to remain back-compatible for a while. So
 335          * load up these old global-based things into our update list.
 336          *
 337          * @return array
 338          */
 339         protected function getOldGlobalUpdates() {
 340                 global $wgExtNewFields, $wgExtNewTables, $wgExtModifiedFields,
 341                         $wgExtNewIndexes, $wgSharedDB, $wgSharedTables;
 342
 343                 $doUser = $this->shared ?
 344                         $wgSharedDB && in_array( 'user', $wgSharedTables ) :
 345                         !$wgSharedDB || !in_array( 'user', $wgSharedTables );
 346
 347                 $updates = array();
 348
 349                 foreach ( $wgExtNewTables as $tableRecord ) {
 350                         $updates[] = array(
 351                                 'addTable', $tableRecord[0], $tableRecord[1], true
 352                         );
 353                 }
 354
 355                 foreach ( $wgExtNewFields as $fieldRecord ) {
 356                         if ( $fieldRecord[0] != 'user' || $doUser ) {
 357                                 $updates[] = array(
 358                                         'addField', $fieldRecord[0], $fieldRecord[1],
 359                                                 $fieldRecord[2], true
 360                                 );
 361                         }
 362                 }
 363
 364                 foreach ( $wgExtNewIndexes as $fieldRecord ) {
 365                         $updates[] = array(
 366                                 'addIndex', $fieldRecord[0], $fieldRecord[1],
 367                                         $fieldRecord[2], true
 368                         );
 369                 }
 370
 371                 foreach ( $wgExtModifiedFields as $fieldRecord ) {
 372                         $updates[] = array(
 373                                 'modifyField', $fieldRecord[0], $fieldRecord[1],
 374                                         $fieldRecord[2], true
 375                         );
 376                 }
 377
 378                 return $updates;
 379         }
 380
 381         /**
 382          * Get an array of updates to perform on the database. Should return a
 383          * multi-dimensional array. The main key is the MediaWiki version (1.12,
 384          * 1.13...) with the values being arrays of updates, identical to how
 385          * updaters.inc did it (for now)
 386          *
 387          * @return Array
 388          */
 389         protected abstract function getCoreUpdateList();
 390
 391         /**
 392          * Applies a SQL patch
 393          * @param $path String Path to the patch file
 394          * @param $isFullPath Boolean Whether to treat $path as a relative or not
 395          */
 396         protected function applyPatch( $path, $isFullPath = false ) {
 397                 if ( $isFullPath ) {
 398                         $this->db->sourceFile( $path );
 399                 } else {
 400                         $this->db->sourceFile( $this->db->patchPath( $path ) );
 401                 }
 402         }
 403
 404         /**
 405          * Add a new table to the database
 406          * @param $name String Name of the new table
 407          * @param $patch String Path to the patch file
 408          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 409          */
 410         protected function addTable( $name, $patch, $fullpath = false ) {
 411                 if ( $this->db->tableExists( $name, __METHOD__ ) ) {
 412                         $this->output( "...$name table already exists.\n" );
 413                 } else {
 414                         $this->output( "Creating $name table..." );
 415                         $this->applyPatch( $patch, $fullpath );
 416                         $this->output( "ok\n" );
 417                 }
 418         }
 419
 420         /**
 421          * Add a new field to an existing table
 422          * @param $table String Name of the table to modify
 423          * @param $field String Name of the new field
 424          * @param $patch String Path to the patch file
 425          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 426          */
 427         protected function addField( $table, $field, $patch, $fullpath = false ) {
 428                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 429                         $this->output( "...$table table does not exist, skipping new field patch\n" );
 430                 } elseif ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 431                         $this->output( "...have $field field in $table table.\n" );
 432                 } else {
 433                         $this->output( "Adding $field field to table $table..." );
 434                         $this->applyPatch( $patch, $fullpath );
 435                         $this->output( "ok\n" );
 436                 }
 437         }
 438
 439         /**
 440          * Add a new index to an existing table
 441          * @param $table String Name of the table to modify
 442          * @param $index String Name of the new index
 443          * @param $patch String Path to the patch file
 444          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 445          */
 446         protected function addIndex( $table, $index, $patch, $fullpath = false ) {
 447                 if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 448                         $this->output( "...$index key already set on $table table.\n" );
 449                 } else {
 450                         $this->output( "Adding $index key to table $table... " );
 451                         $this->applyPatch( $patch, $fullpath );
 452                         $this->output( "ok\n" );
 453                 }
 454         }
 455
 456         /**
 457          * Drop a field from an existing table
 458          *
 459          * @param $table String Name of the table to modify
 460          * @param $field String Name of the old field
 461          * @param $patch String Path to the patch file
 462          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 463          */
 464         protected function dropField( $table, $field, $patch, $fullpath = false ) {
 465                 if ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 466                         $this->output( "Table $table contains $field field. Dropping... " );
 467                         $this->applyPatch( $patch, $fullpath );
 468                         $this->output( "ok\n" );
 469                 } else {
 470                         $this->output( "...$table table does not contain $field field.\n" );
 471                 }
 472         }
 473
 474         /**
 475          * Drop an index from an existing table
 476          *
 477          * @param $table String: Name of the table to modify
 478          * @param $index String: Name of the old index
 479          * @param $patch String: Path to the patch file
 480          * @param $fullpath Boolean: Whether to treat $patch path as a relative or not
 481          */
 482         protected function dropIndex( $table, $index, $patch, $fullpath = false ) {
 483                 if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 484                         $this->output( "Dropping $index key from table $table... " );
 485                         $this->applyPatch( $patch, $fullpath );
 486                         $this->output( "ok\n" );
 487                 } else {
 488                         $this->output( "...$index key doesn't exist.\n" );
 489                 }
 490         }
 491
 492         /**
 493          * @param $table string
 494          * @param $patch string
 495          * @param $fullpath bool
 496          */
 497         protected function dropTable( $table, $patch, $fullpath = false ) {
 498                 if ( $this->db->tableExists( $table, __METHOD__ ) ) {
 499                         $this->output( "Dropping table $table... " );
 500                         $this->applyPatch( $patch, $fullpath );
 501                         $this->output( "ok\n" );
 502                 } else {
 503                         $this->output( "...$table doesn't exist.\n" );
 504                 }
 505         }
 506
 507         /**
 508          * Modify an existing field
 509          *
 510          * @param $table String: name of the table to which the field belongs
 511          * @param $field String: name of the field to modify
 512          * @param $patch String: path to the patch file
 513          * @param $fullpath Boolean: whether to treat $patch path as a relative or not
 514          */
 515         public function modifyField( $table, $field, $patch, $fullpath = false ) {
 516                 $updateKey = "$table-$field-$patch";
 517                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 518                         $this->output( "...$table table does not exist, skipping modify field patch\n" );
 519                 } elseif ( !$this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 520                         $this->output( "...$field field does not exist in $table table, skipping modify field patch\n" );
 521                 } elseif( $this->updateRowExists( $updateKey ) ) {
 522                         $this->output( "...$field in table $table already modified by patch $patch\n" );
 523                 } else {
 524                         $this->output( "Modifying $field field of table $table..." );
 525                         $this->applyPatch( $patch, $fullpath );
 526                         $this->insertUpdateRow( $updateKey );
 527                         $this->output( "ok\n" );
 528                 }
 529         }
 530
 531         /**
 532          * Purge the objectcache table
 533          */
 534         protected function purgeCache() {
 535                 # We can't guarantee that the user will be able to use TRUNCATE,
 536                 # but we know that DELETE is available to us
 537                 $this->output( "Purging caches..." );
 538                 $this->db->delete( 'objectcache', '*', __METHOD__ );
 539                 $this->output( "done.\n" );
 540         }
 541
 542         /**
 543          * Check the site_stats table is not properly populated.
 544          */
 545         protected function checkStats() {
 546                 $this->output( "Checking site_stats row..." );
 547                 $row = $this->db->selectRow( 'site_stats', '*', array( 'ss_row_id' => 1 ), __METHOD__ );
 548                 if ( $row === false ) {
 549                         $this->output( "data is missing! rebuilding...\n" );
 550                 } elseif ( isset( $row->site_stats ) && $row->ss_total_pages == -1 ) {
 551                         $this->output( "missing ss_total_pages, rebuilding...\n" );
 552                 } else {
 553                         $this->output( "done.\n" );
 554                         return;
 555                 }
 556                 SiteStatsInit::doAllAndCommit( $this->db );
 557         }
 558
 559         # Common updater functions
 560
 561         /**
 562          * Sets the number of active users in the site_stats table
 563          */
 564         protected function doActiveUsersInit() {
 565                 $activeUsers = $this->db->selectField( 'site_stats', 'ss_active_users', false, __METHOD__ );
 566                 if ( $activeUsers == -1 ) {
 567                         $activeUsers = $this->db->selectField( 'recentchanges',
 568                                 'COUNT( DISTINCT rc_user_text )',
 569                                 array( 'rc_user != 0', 'rc_bot' => 0, "rc_log_type != 'newusers'" ), __METHOD__
 570                         );
 571                         $this->db->update( 'site_stats',
 572                                 array( 'ss_active_users' => intval( $activeUsers ) ),
 573                                 array( 'ss_row_id' => 1 ), __METHOD__, array( 'LIMIT' => 1 )
 574                         );
 575                 }
 576                 $this->output( "...ss_active_users user count set...\n" );
 577         }
 578
 579         /**
 580          * Populates the log_user_text field in the logging table
 581          */
 582         protected function doLogUsertextPopulation() {
 583                 if ( !$this->updateRowExists( 'populate log_usertext' ) ) {
 584                         $this->output(
 585                         "Populating log_user_text field, printing progress markers. For large\n" .
 586                         "databases, you may want to hit Ctrl-C and do this manually with\n" .
 587                         "maintenance/populateLogUsertext.php.\n" );
 588
 589                         $task = $this->maintenance->runChild( 'PopulateLogUsertext' );
 590                         $task->execute();
 591                 }
 592         }
 593
 594         /**
 595          * Migrate log params to new table and index for searching
 596          */
 597         protected function doLogSearchPopulation() {
 598                 if ( !$this->updateRowExists( 'populate log_search' ) ) {
 599                         $this->output(
 600                                 "Populating log_search table, printing progress markers. For large\n" .
 601                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
 602                                 "maintenance/populateLogSearch.php.\n" );
 603
 604                         $task = $this->maintenance->runChild( 'PopulateLogSearch' );
 605                         $task->execute();
 606                 }
 607         }
 608
 609         /**
 610          * Updates the timestamps in the transcache table
 611          */
 612         protected function doUpdateTranscacheField() {
 613                 if ( $this->updateRowExists( 'convert transcache field' ) ) {
 614                         $this->output( "...transcache tc_time already converted.\n" );
 615                         return;
 616                 }
 617
 618                 $this->output( "Converting tc_time from UNIX epoch to MediaWiki timestamp... " );
 619                 $this->applyPatch( 'patch-tc-timestamp.sql' );
 620                 $this->output( "ok\n" );
 621         }
 622
 623         /**
 624          * Update CategoryLinks collation
 625          */
 626         protected function doCollationUpdate() {
 627                 global $wgCategoryCollation;
 628                 if ( $this->db->selectField(
 629                         'categorylinks',
 630                         'COUNT(*)',
 631                         'cl_collation != ' . $this->db->addQuotes( $wgCategoryCollation ),
 632                         __METHOD__
 633                 ) == 0 ) {
 634                         $this->output( "...collations up-to-date.\n" );
 635                         return;
 636                 }
 637
 638                 $task = $this->maintenance->runChild( 'UpdateCollation' );
 639                 $task->execute();
 640         }
 641
 642         /**
 643          * Migrates user options from the user table blob to user_properties
 644          */
 645         protected function doMigrateUserOptions() {
 646                 $cl = $this->maintenance->runChild( 'ConvertUserOptions', 'convertUserOptions.php' );
 647                 $this->output( "Migrating remaining user_options... " );
 648                 $cl->execute();
 649                 $this->output( "done.\n" );
 650         }
 651
 652         /**
 653          * Rebuilds the localisation cache
 654          */
 655         protected function doRebuildLocalisationCache() {
 656                 /**
 657                  * @var $cl RebuildLocalisationCache
 658                  */
 659                 $cl = $this->maintenance->runChild( 'RebuildLocalisationCache', 'rebuildLocalisationCache.php' );
 660                 $this->output( "Rebuilding localisation cache...\n" );
 661                 $cl->setForce();
 662                 $cl->execute();
 663                 $this->output( "Rebuilding localisation cache done.\n" );
 664         }
 665 }