includes/installer/DatabaseUpdater.php

   1 <?php
   2 /**
   3  * DBMS-specific updater helper.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23 use Wikimedia\Rdbms\Database;
  24 use Wikimedia\Rdbms\IDatabase;
  25 use MediaWiki\MediaWikiServices;
  26
  27 require_once __DIR__ . '/../../maintenance/Maintenance.php';
  28
  29 /**
  30  * Class for handling database updates. Roughly based off of updaters.inc, with
  31  * a few improvements :)
  32  *
  33  * @ingroup Deployment
  34  * @since 1.17
  35  */
  36 abstract class DatabaseUpdater {
  37         /**
  38          * Array of updates to perform on the database
  39          *
  40          * @var array
  41          */
  42         protected $updates = [];
  43
  44         /**
  45          * Array of updates that were skipped
  46          *
  47          * @var array
  48          */
  49         protected $updatesSkipped = [];
  50
  51         /**
  52          * List of extension-provided database updates
  53          * @var array
  54          */
  55         protected $extensionUpdates = [];
  56
  57         /**
  58          * Handle to the database subclass
  59          *
  60          * @var Database
  61          */
  62         protected $db;
  63
  64         /**
  65          * @var Maintenance
  66          */
  67         protected $maintenance;
  68
  69         protected $shared = false;
  70
  71         /**
  72          * @var string[] Scripts to run after database update
  73          * Should be a subclass of LoggedUpdateMaintenance
  74          */
  75         protected $postDatabaseUpdateMaintenance = [
  76                 DeleteDefaultMessages::class,
  77                 PopulateRevisionLength::class,
  78                 PopulateRevisionSha1::class,
  79                 PopulateImageSha1::class,
  80                 FixExtLinksProtocolRelative::class,
  81                 PopulateFilearchiveSha1::class,
  82                 PopulateBacklinkNamespace::class,
  83                 FixDefaultJsonContentPages::class,
  84                 CleanupEmptyCategories::class,
  85                 AddRFCandPMIDInterwiki::class,
  86                 PopulatePPSortKey::class,
  87                 PopulateIpChanges::class,
  88         ];
  89
  90         /**
  91          * File handle for SQL output.
  92          *
  93          * @var resource
  94          */
  95         protected $fileHandle = null;
  96
  97         /**
  98          * Flag specifying whether or not to skip schema (e.g. SQL-only) updates.
  99          *
 100          * @var bool
 101          */
 102         protected $skipSchema = false;
 103
 104         /**
 105          * Hold the value of $wgContentHandlerUseDB during the upgrade.
 106          */
 107         protected $holdContentHandlerUseDB = true;
 108
 109         /**
 110          * @param Database &$db To perform updates on
 111          * @param bool $shared Whether to perform updates on shared tables
 112          * @param Maintenance|null $maintenance Maintenance object which created us
 113          */
 114         protected function __construct( Database &$db, $shared, Maintenance $maintenance = null ) {
 115                 $this->db = $db;
 116                 $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
 117                 $this->shared = $shared;
 118                 if ( $maintenance ) {
 119                         $this->maintenance = $maintenance;
 120                         $this->fileHandle = $maintenance->fileHandle;
 121                 } else {
 122                         $this->maintenance = new FakeMaintenance;
 123                 }
 124                 $this->maintenance->setDB( $db );
 125                 $this->initOldGlobals();
 126                 $this->loadExtensions();
 127                 Hooks::run( 'LoadExtensionSchemaUpdates', [ $this ] );
 128         }
 129
 130         /**
 131          * Initialize all of the old globals. One day this should all become
 132          * something much nicer
 133          */
 134         private function initOldGlobals() {
 135                 global $wgExtNewTables, $wgExtNewFields, $wgExtPGNewFields,
 136                         $wgExtPGAlteredFields, $wgExtNewIndexes, $wgExtModifiedFields;
 137
 138                 # For extensions only, should be populated via hooks
 139                 # $wgDBtype should be checked to specify the proper file
 140                 $wgExtNewTables = []; // table, dir
 141                 $wgExtNewFields = []; // table, column, dir
 142                 $wgExtPGNewFields = []; // table, column, column attributes; for PostgreSQL
 143                 $wgExtPGAlteredFields = []; // table, column, new type, conversion method; for PostgreSQL
 144                 $wgExtNewIndexes = []; // table, index, dir
 145                 $wgExtModifiedFields = []; // table, index, dir
 146         }
 147
 148         /**
 149          * Loads LocalSettings.php, if needed, and initialises everything needed for
 150          * LoadExtensionSchemaUpdates hook.
 151          */
 152         private function loadExtensions() {
 153                 if ( !defined( 'MEDIAWIKI_INSTALL' ) || defined( 'MW_EXTENSIONS_LOADED' ) ) {
 154                         return; // already loaded
 155                 }
 156                 $vars = Installer::getExistingLocalSettings();
 157
 158                 $registry = ExtensionRegistry::getInstance();
 159                 $queue = $registry->getQueue();
 160                 // Don't accidentally load extensions in the future
 161                 $registry->clearQueue();
 162
 163                 // This will automatically add "AutoloadClasses" to $wgAutoloadClasses
 164                 $data = $registry->readFromQueue( $queue );
 165                 $hooks = [];
 166                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
 167                         $hooks = $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'];
 168                 }
 169                 if ( $vars && isset( $vars['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
 170                         $hooks = array_merge_recursive( $hooks, $vars['wgHooks']['LoadExtensionSchemaUpdates'] );
 171                 }
 172                 global $wgHooks, $wgAutoloadClasses;
 173                 $wgHooks['LoadExtensionSchemaUpdates'] = $hooks;
 174                 if ( $vars && isset( $vars['wgAutoloadClasses'] ) ) {
 175                         $wgAutoloadClasses += $vars['wgAutoloadClasses'];
 176                 }
 177         }
 178
 179         /**
 180          * @param Database $db
 181          * @param bool $shared
 182          * @param Maintenance|null $maintenance
 183          *
 184          * @throws MWException
 185          * @return DatabaseUpdater
 186          */
 187         public static function newForDB( Database $db, $shared = false, Maintenance $maintenance = null ) {
 188                 $type = $db->getType();
 189                 if ( in_array( $type, Installer::getDBTypes() ) ) {
 190                         $class = ucfirst( $type ) . 'Updater';
 191
 192                         return new $class( $db, $shared, $maintenance );
 193                 } else {
 194                         throw new MWException( __METHOD__ . ' called for unsupported $wgDBtype' );
 195                 }
 196         }
 197
 198         /**
 199          * Get a database connection to run updates
 200          *
 201          * @return Database
 202          */
 203         public function getDB() {
 204                 return $this->db;
 205         }
 206
 207         /**
 208          * Output some text. If we're running from web, escape the text first.
 209          *
 210          * @param string $str Text to output
 211          */
 212         public function output( $str ) {
 213                 if ( $this->maintenance->isQuiet() ) {
 214                         return;
 215                 }
 216                 global $wgCommandLineMode;
 217                 if ( !$wgCommandLineMode ) {
 218                         $str = htmlspecialchars( $str );
 219                 }
 220                 echo $str;
 221                 flush();
 222         }
 223
 224         /**
 225          * Add a new update coming from an extension. This should be called by
 226          * extensions while executing the LoadExtensionSchemaUpdates hook.
 227          *
 228          * @since 1.17
 229          *
 230          * @param array $update The update to run. Format is [ $callback, $params... ]
 231          *   $callback is the method to call; either a DatabaseUpdater method name or a callable.
 232          *   Must be serializable (ie. no anonymous functions allowed). The rest of the parameters
 233          *   (if any) will be passed to the callback. The first parameter passed to the callback
 234          *   is always this object.
 235          */
 236         public function addExtensionUpdate( array $update ) {
 237                 $this->extensionUpdates[] = $update;
 238         }
 239
 240         /**
 241          * Convenience wrapper for addExtensionUpdate() when adding a new table (which
 242          * is the most common usage of updaters in an extension)
 243          *
 244          * @since 1.18
 245          *
 246          * @param string $tableName Name of table to create
 247          * @param string $sqlPath Full path to the schema file
 248          */
 249         public function addExtensionTable( $tableName, $sqlPath ) {
 250                 $this->extensionUpdates[] = [ 'addTable', $tableName, $sqlPath, true ];
 251         }
 252
 253         /**
 254          * @since 1.19
 255          *
 256          * @param string $tableName
 257          * @param string $indexName
 258          * @param string $sqlPath
 259          */
 260         public function addExtensionIndex( $tableName, $indexName, $sqlPath ) {
 261                 $this->extensionUpdates[] = [ 'addIndex', $tableName, $indexName, $sqlPath, true ];
 262         }
 263
 264         /**
 265          *
 266          * @since 1.19
 267          *
 268          * @param string $tableName
 269          * @param string $columnName
 270          * @param string $sqlPath
 271          */
 272         public function addExtensionField( $tableName, $columnName, $sqlPath ) {
 273                 $this->extensionUpdates[] = [ 'addField', $tableName, $columnName, $sqlPath, true ];
 274         }
 275
 276         /**
 277          *
 278          * @since 1.20
 279          *
 280          * @param string $tableName
 281          * @param string $columnName
 282          * @param string $sqlPath
 283          */
 284         public function dropExtensionField( $tableName, $columnName, $sqlPath ) {
 285                 $this->extensionUpdates[] = [ 'dropField', $tableName, $columnName, $sqlPath, true ];
 286         }
 287
 288         /**
 289          * Drop an index from an extension table
 290          *
 291          * @since 1.21
 292          *
 293          * @param string $tableName The table name
 294          * @param string $indexName The index name
 295          * @param string $sqlPath The path to the SQL change path
 296          */
 297         public function dropExtensionIndex( $tableName, $indexName, $sqlPath ) {
 298                 $this->extensionUpdates[] = [ 'dropIndex', $tableName, $indexName, $sqlPath, true ];
 299         }
 300
 301         /**
 302          *
 303          * @since 1.20
 304          *
 305          * @param string $tableName
 306          * @param string $sqlPath
 307          */
 308         public function dropExtensionTable( $tableName, $sqlPath ) {
 309                 $this->extensionUpdates[] = [ 'dropTable', $tableName, $sqlPath, true ];
 310         }
 311
 312         /**
 313          * Rename an index on an extension table
 314          *
 315          * @since 1.21
 316          *
 317          * @param string $tableName The table name
 318          * @param string $oldIndexName The old index name
 319          * @param string $newIndexName The new index name
 320          * @param string $sqlPath The path to the SQL change path
 321          * @param bool $skipBothIndexExistWarning Whether to warn if both the old
 322          * and the new indexes exist. [facultative; by default, false]
 323          */
 324         public function renameExtensionIndex( $tableName, $oldIndexName, $newIndexName,
 325                 $sqlPath, $skipBothIndexExistWarning = false
 326         ) {
 327                 $this->extensionUpdates[] = [
 328                         'renameIndex',
 329                         $tableName,
 330                         $oldIndexName,
 331                         $newIndexName,
 332                         $skipBothIndexExistWarning,
 333                         $sqlPath,
 334                         true
 335                 ];
 336         }
 337
 338         /**
 339          * @since 1.21
 340          *
 341          * @param string $tableName The table name
 342          * @param string $fieldName The field to be modified
 343          * @param string $sqlPath The path to the SQL patch
 344          */
 345         public function modifyExtensionField( $tableName, $fieldName, $sqlPath ) {
 346                 $this->extensionUpdates[] = [ 'modifyField', $tableName, $fieldName, $sqlPath, true ];
 347         }
 348
 349         /**
 350          * @since 1.31
 351          *
 352          * @param string $tableName The table name
 353          * @param string $sqlPath The path to the SQL patch
 354          */
 355         public function modifyExtensionTable( $tableName, $sqlPath ) {
 356                 $this->extensionUpdates[] = [ 'modifyTable', $tableName, $sqlPath, true ];
 357         }
 358
 359         /**
 360          *
 361          * @since 1.20
 362          *
 363          * @param string $tableName
 364          * @return bool
 365          */
 366         public function tableExists( $tableName ) {
 367                 return ( $this->db->tableExists( $tableName, __METHOD__ ) );
 368         }
 369
 370         /**
 371          * Add a maintenance script to be run after the database updates are complete.
 372          *
 373          * Script should subclass LoggedUpdateMaintenance
 374          *
 375          * @since 1.19
 376          *
 377          * @param string $class Name of a Maintenance subclass
 378          */
 379         public function addPostDatabaseUpdateMaintenance( $class ) {
 380                 $this->postDatabaseUpdateMaintenance[] = $class;
 381         }
 382
 383         /**
 384          * Get the list of extension-defined updates
 385          *
 386          * @return array
 387          */
 388         protected function getExtensionUpdates() {
 389                 return $this->extensionUpdates;
 390         }
 391
 392         /**
 393          * @since 1.17
 394          *
 395          * @return string[]
 396          */
 397         public function getPostDatabaseUpdateMaintenance() {
 398                 return $this->postDatabaseUpdateMaintenance;
 399         }
 400
 401         /**
 402          * @since 1.21
 403          *
 404          * Writes the schema updates desired to a file for the DB Admin to run.
 405          * @param array $schemaUpdate
 406          */
 407         private function writeSchemaUpdateFile( array $schemaUpdate = [] ) {
 408                 $updates = $this->updatesSkipped;
 409                 $this->updatesSkipped = [];
 410
 411                 foreach ( $updates as $funcList ) {
 412                         $func = $funcList[0];
 413                         $args = $funcList[1];
 414                         $origParams = $funcList[2];
 415                         $func( ...$args );
 416                         flush();
 417                         $this->updatesSkipped[] = $origParams;
 418                 }
 419         }
 420
 421         /**
 422          * Get appropriate schema variables in the current database connection.
 423          *
 424          * This should be called after any request data has been imported, but before
 425          * any write operations to the database. The result should be passed to the DB
 426          * setSchemaVars() method.
 427          *
 428          * @return array
 429          * @since 1.28
 430          */
 431         public function getSchemaVars() {
 432                 return []; // DB-type specific
 433         }
 434
 435         /**
 436          * Do all the updates
 437          *
 438          * @param array $what What updates to perform
 439          */
 440         public function doUpdates( array $what = [ 'core', 'extensions', 'stats' ] ) {
 441                 $this->db->setSchemaVars( $this->getSchemaVars() );
 442
 443                 $what = array_flip( $what );
 444                 $this->skipSchema = isset( $what['noschema'] ) || $this->fileHandle !== null;
 445                 if ( isset( $what['core'] ) ) {
 446                         $this->runUpdates( $this->getCoreUpdateList(), false );
 447                 }
 448                 if ( isset( $what['extensions'] ) ) {
 449                         $this->runUpdates( $this->getOldGlobalUpdates(), false );
 450                         $this->runUpdates( $this->getExtensionUpdates(), true );
 451                 }
 452
 453                 if ( isset( $what['stats'] ) ) {
 454                         $this->checkStats();
 455                 }
 456
 457                 if ( $this->fileHandle ) {
 458                         $this->skipSchema = false;
 459                         $this->writeSchemaUpdateFile();
 460                 }
 461         }
 462
 463         /**
 464          * Helper function for doUpdates()
 465          *
 466          * @param array $updates Array of updates to run
 467          * @param bool $passSelf Whether to pass this object we calling external functions
 468          */
 469         private function runUpdates( array $updates, $passSelf ) {
 470                 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
 471
 472                 $updatesDone = [];
 473                 $updatesSkipped = [];
 474                 foreach ( $updates as $params ) {
 475                         $origParams = $params;
 476                         $func = array_shift( $params );
 477                         if ( !is_array( $func ) && method_exists( $this, $func ) ) {
 478                                 $func = [ $this, $func ];
 479                         } elseif ( $passSelf ) {
 480                                 array_unshift( $params, $this );
 481                         }
 482                         $ret = $func( ...$params );
 483                         flush();
 484                         if ( $ret !== false ) {
 485                                 $updatesDone[] = $origParams;
 486                                 $lbFactory->waitForReplication();
 487                         } else {
 488                                 $updatesSkipped[] = [ $func, $params, $origParams ];
 489                         }
 490                 }
 491                 $this->updatesSkipped = array_merge( $this->updatesSkipped, $updatesSkipped );
 492                 $this->updates = array_merge( $this->updates, $updatesDone );
 493         }
 494
 495         /**
 496          * Helper function: check if the given key is present in the updatelog table.
 497          * Obviously, only use this for updates that occur after the updatelog table was
 498          * created!
 499          * @param string $key Name of the key to check for
 500          * @return bool
 501          */
 502         public function updateRowExists( $key ) {
 503                 $row = $this->db->selectRow(
 504                         'updatelog',
 505                         # T67813
 506                         '1 AS X',
 507                         [ 'ul_key' => $key ],
 508                         __METHOD__
 509                 );
 510
 511                 return (bool)$row;
 512         }
 513
 514         /**
 515          * Helper function: Add a key to the updatelog table
 516          * Obviously, only use this for updates that occur after the updatelog table was
 517          * created!
 518          * @param string $key Name of key to insert
 519          * @param string|null $val [optional] Value to insert along with the key
 520          */
 521         public function insertUpdateRow( $key, $val = null ) {
 522                 $this->db->clearFlag( DBO_DDLMODE );
 523                 $values = [ 'ul_key' => $key ];
 524                 if ( $val && $this->canUseNewUpdatelog() ) {
 525                         $values['ul_value'] = $val;
 526                 }
 527                 $this->db->insert( 'updatelog', $values, __METHOD__, 'IGNORE' );
 528                 $this->db->setFlag( DBO_DDLMODE );
 529         }
 530
 531         /**
 532          * Updatelog was changed in 1.17 to have a ul_value column so we can record
 533          * more information about what kind of updates we've done (that's what this
 534          * class does). Pre-1.17 wikis won't have this column, and really old wikis
 535          * might not even have updatelog at all
 536          *
 537          * @return bool
 538          */
 539         protected function canUseNewUpdatelog() {
 540                 return $this->db->tableExists( 'updatelog', __METHOD__ ) &&
 541                         $this->db->fieldExists( 'updatelog', 'ul_value', __METHOD__ );
 542         }
 543
 544         /**
 545          * Returns whether updates should be executed on the database table $name.
 546          * Updates will be prevented if the table is a shared table and it is not
 547          * specified to run updates on shared tables.
 548          *
 549          * @param string $name Table name
 550          * @return bool
 551          */
 552         protected function doTable( $name ) {
 553                 global $wgSharedDB, $wgSharedTables;
 554
 555                 // Don't bother to check $wgSharedTables if there isn't a shared database
 556                 // or the user actually also wants to do updates on the shared database.
 557                 if ( $wgSharedDB === null || $this->shared ) {
 558                         return true;
 559                 }
 560
 561                 if ( in_array( $name, $wgSharedTables ) ) {
 562                         $this->output( "...skipping update to shared table $name.\n" );
 563                         return false;
 564                 } else {
 565                         return true;
 566                 }
 567         }
 568
 569         /**
 570          * Before 1.17, we used to handle updates via stuff like
 571          * $wgExtNewTables/Fields/Indexes. This is nasty :) We refactored a lot
 572          * of this in 1.17 but we want to remain back-compatible for a while. So
 573          * load up these old global-based things into our update list.
 574          *
 575          * @return array
 576          */
 577         protected function getOldGlobalUpdates() {
 578                 global $wgExtNewFields, $wgExtNewTables, $wgExtModifiedFields,
 579                         $wgExtNewIndexes;
 580
 581                 $updates = [];
 582
 583                 foreach ( $wgExtNewTables as $tableRecord ) {
 584                         $updates[] = [
 585                                 'addTable', $tableRecord[0], $tableRecord[1], true
 586                         ];
 587                 }
 588
 589                 foreach ( $wgExtNewFields as $fieldRecord ) {
 590                         $updates[] = [
 591                                 'addField', $fieldRecord[0], $fieldRecord[1],
 592                                 $fieldRecord[2], true
 593                         ];
 594                 }
 595
 596                 foreach ( $wgExtNewIndexes as $fieldRecord ) {
 597                         $updates[] = [
 598                                 'addIndex', $fieldRecord[0], $fieldRecord[1],
 599                                 $fieldRecord[2], true
 600                         ];
 601                 }
 602
 603                 foreach ( $wgExtModifiedFields as $fieldRecord ) {
 604                         $updates[] = [
 605                                 'modifyField', $fieldRecord[0], $fieldRecord[1],
 606                                 $fieldRecord[2], true
 607                         ];
 608                 }
 609
 610                 return $updates;
 611         }
 612
 613         /**
 614          * Get an array of updates to perform on the database. Should return a
 615          * multi-dimensional array. The main key is the MediaWiki version (1.12,
 616          * 1.13...) with the values being arrays of updates, identical to how
 617          * updaters.inc did it (for now)
 618          *
 619          * @return array[]
 620          */
 621         abstract protected function getCoreUpdateList();
 622
 623         /**
 624          * Append an SQL fragment to the open file handle.
 625          *
 626          * @param string $filename File name to open
 627          */
 628         public function copyFile( $filename ) {
 629                 $this->db->sourceFile(
 630                         $filename,
 631                         null,
 632                         null,
 633                         __METHOD__,
 634                         [ $this, 'appendLine' ]
 635                 );
 636         }
 637
 638         /**
 639          * Append a line to the open filehandle.  The line is assumed to
 640          * be a complete SQL statement.
 641          *
 642          * This is used as a callback for sourceLine().
 643          *
 644          * @param string $line Text to append to the file
 645          * @return bool False to skip actually executing the file
 646          * @throws MWException
 647          */
 648         public function appendLine( $line ) {
 649                 $line = rtrim( $line ) . ";\n";
 650                 if ( fwrite( $this->fileHandle, $line ) === false ) {
 651                         throw new MWException( "trouble writing file" );
 652                 }
 653
 654                 return false;
 655         }
 656
 657         /**
 658          * Applies a SQL patch
 659          *
 660          * @param string $path Path to the patch file
 661          * @param bool $isFullPath Whether to treat $path as a relative or not
 662          * @param string|null $msg Description of the patch
 663          * @return bool False if patch is skipped.
 664          */
 665         protected function applyPatch( $path, $isFullPath = false, $msg = null ) {
 666                 if ( $msg === null ) {
 667                         $msg = "Applying $path patch";
 668                 }
 669                 if ( $this->skipSchema ) {
 670                         $this->output( "...skipping schema change ($msg).\n" );
 671
 672                         return false;
 673                 }
 674
 675                 $this->output( "$msg ..." );
 676
 677                 if ( !$isFullPath ) {
 678                         $path = $this->patchPath( $this->db, $path );
 679                 }
 680                 if ( $this->fileHandle !== null ) {
 681                         $this->copyFile( $path );
 682                 } else {
 683                         $this->db->sourceFile( $path );
 684                 }
 685                 $this->output( "done.\n" );
 686
 687                 return true;
 688         }
 689
 690         /**
 691          * Get the full path of a patch file. Originally based on archive()
 692          * from updaters.inc. Keep in mind this always returns a patch, as
 693          * it fails back to MySQL if no DB-specific patch can be found
 694          *
 695          * @param IDatabase $db
 696          * @param string $patch The name of the patch, like patch-something.sql
 697          * @return string Full path to patch file
 698          */
 699         public function patchPath( IDatabase $db, $patch ) {
 700                 global $IP;
 701
 702                 $dbType = $db->getType();
 703                 if ( file_exists( "$IP/maintenance/$dbType/archives/$patch" ) ) {
 704                         return "$IP/maintenance/$dbType/archives/$patch";
 705                 } else {
 706                         return "$IP/maintenance/archives/$patch";
 707                 }
 708         }
 709
 710         /**
 711          * Add a new table to the database
 712          *
 713          * @param string $name Name of the new table
 714          * @param string $patch Path to the patch file
 715          * @param bool $fullpath Whether to treat $patch path as a relative or not
 716          * @return bool False if this was skipped because schema changes are skipped
 717          */
 718         protected function addTable( $name, $patch, $fullpath = false ) {
 719                 if ( !$this->doTable( $name ) ) {
 720                         return true;
 721                 }
 722
 723                 if ( $this->db->tableExists( $name, __METHOD__ ) ) {
 724                         $this->output( "...$name table already exists.\n" );
 725                 } else {
 726                         return $this->applyPatch( $patch, $fullpath, "Creating $name table" );
 727                 }
 728
 729                 return true;
 730         }
 731
 732         /**
 733          * Add a new field to an existing table
 734          *
 735          * @param string $table Name of the table to modify
 736          * @param string $field Name of the new field
 737          * @param string $patch Path to the patch file
 738          * @param bool $fullpath Whether to treat $patch path as a relative or not
 739          * @return bool False if this was skipped because schema changes are skipped
 740          */
 741         protected function addField( $table, $field, $patch, $fullpath = false ) {
 742                 if ( !$this->doTable( $table ) ) {
 743                         return true;
 744                 }
 745
 746                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 747                         $this->output( "...$table table does not exist, skipping new field patch.\n" );
 748                 } elseif ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 749                         $this->output( "...have $field field in $table table.\n" );
 750                 } else {
 751                         return $this->applyPatch( $patch, $fullpath, "Adding $field field to table $table" );
 752                 }
 753
 754                 return true;
 755         }
 756
 757         /**
 758          * Add a new index to an existing table
 759          *
 760          * @param string $table Name of the table to modify
 761          * @param string $index Name of the new index
 762          * @param string $patch Path to the patch file
 763          * @param bool $fullpath Whether to treat $patch path as a relative or not
 764          * @return bool False if this was skipped because schema changes are skipped
 765          */
 766         protected function addIndex( $table, $index, $patch, $fullpath = false ) {
 767                 if ( !$this->doTable( $table ) ) {
 768                         return true;
 769                 }
 770
 771                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 772                         $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
 773                 } elseif ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 774                         $this->output( "...index $index already set on $table table.\n" );
 775                 } else {
 776                         return $this->applyPatch( $patch, $fullpath, "Adding index $index to table $table" );
 777                 }
 778
 779                 return true;
 780         }
 781
 782         /**
 783          * Add a new index to an existing table if none of the given indexes exist
 784          *
 785          * @param string $table Name of the table to modify
 786          * @param string[] $indexes Name of the indexes to check. $indexes[0] should
 787          *  be the one actually being added.
 788          * @param string $patch Path to the patch file
 789          * @param bool $fullpath Whether to treat $patch path as a relative or not
 790          * @return bool False if this was skipped because schema changes are skipped
 791          */
 792         protected function addIndexIfNoneExist( $table, $indexes, $patch, $fullpath = false ) {
 793                 if ( !$this->doTable( $table ) ) {
 794                         return true;
 795                 }
 796
 797                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 798                         $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
 799                         return true;
 800                 }
 801
 802                 $newIndex = $indexes[0];
 803                 foreach ( $indexes as $index ) {
 804                         if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 805                                 $this->output(
 806                                         "...skipping index $newIndex because index $index already set on $table table.\n"
 807                                 );
 808                                 return true;
 809                         }
 810                 }
 811
 812                 return $this->applyPatch( $patch, $fullpath, "Adding index $index to table $table" );
 813         }
 814
 815         /**
 816          * Drop a field from an existing table
 817          *
 818          * @param string $table Name of the table to modify
 819          * @param string $field Name of the old field
 820          * @param string $patch Path to the patch file
 821          * @param bool $fullpath Whether to treat $patch path as a relative or not
 822          * @return bool False if this was skipped because schema changes are skipped
 823          */
 824         protected function dropField( $table, $field, $patch, $fullpath = false ) {
 825                 if ( !$this->doTable( $table ) ) {
 826                         return true;
 827                 }
 828
 829                 if ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 830                         return $this->applyPatch( $patch, $fullpath, "Table $table contains $field field. Dropping" );
 831                 } else {
 832                         $this->output( "...$table table does not contain $field field.\n" );
 833                 }
 834
 835                 return true;
 836         }
 837
 838         /**
 839          * Drop an index from an existing table
 840          *
 841          * @param string $table Name of the table to modify
 842          * @param string $index Name of the index
 843          * @param string $patch Path to the patch file
 844          * @param bool $fullpath Whether to treat $patch path as a relative or not
 845          * @return bool False if this was skipped because schema changes are skipped
 846          */
 847         protected function dropIndex( $table, $index, $patch, $fullpath = false ) {
 848                 if ( !$this->doTable( $table ) ) {
 849                         return true;
 850                 }
 851
 852                 if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 853                         return $this->applyPatch( $patch, $fullpath, "Dropping $index index from table $table" );
 854                 } else {
 855                         $this->output( "...$index key doesn't exist.\n" );
 856                 }
 857
 858                 return true;
 859         }
 860
 861         /**
 862          * Rename an index from an existing table
 863          *
 864          * @param string $table Name of the table to modify
 865          * @param string $oldIndex Old name of the index
 866          * @param string $newIndex New name of the index
 867          * @param bool $skipBothIndexExistWarning Whether to warn if both the
 868          * old and the new indexes exist.
 869          * @param string $patch Path to the patch file
 870          * @param bool $fullpath Whether to treat $patch path as a relative or not
 871          * @return bool False if this was skipped because schema changes are skipped
 872          */
 873         protected function renameIndex( $table, $oldIndex, $newIndex,
 874                 $skipBothIndexExistWarning, $patch, $fullpath = false
 875         ) {
 876                 if ( !$this->doTable( $table ) ) {
 877                         return true;
 878                 }
 879
 880                 // First requirement: the table must exist
 881                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 882                         $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
 883
 884                         return true;
 885                 }
 886
 887                 // Second requirement: the new index must be missing
 888                 if ( $this->db->indexExists( $table, $newIndex, __METHOD__ ) ) {
 889                         $this->output( "...index $newIndex already set on $table table.\n" );
 890                         if ( !$skipBothIndexExistWarning &&
 891                                 $this->db->indexExists( $table, $oldIndex, __METHOD__ )
 892                         ) {
 893                                 $this->output( "...WARNING: $oldIndex still exists, despite it has " .
 894                                         "been renamed into $newIndex (which also exists).\n" .
 895                                         "            $oldIndex should be manually removed if not needed anymore.\n" );
 896                         }
 897
 898                         return true;
 899                 }
 900
 901                 // Third requirement: the old index must exist
 902                 if ( !$this->db->indexExists( $table, $oldIndex, __METHOD__ ) ) {
 903                         $this->output( "...skipping: index $oldIndex doesn't exist.\n" );
 904
 905                         return true;
 906                 }
 907
 908                 // Requirements have been satisfied, patch can be applied
 909                 return $this->applyPatch(
 910                         $patch,
 911                         $fullpath,
 912                         "Renaming index $oldIndex into $newIndex to table $table"
 913                 );
 914         }
 915
 916         /**
 917          * If the specified table exists, drop it, or execute the
 918          * patch if one is provided.
 919          *
 920          * Public @since 1.20
 921          *
 922          * @param string $table Table to drop.
 923          * @param string|bool $patch String of patch file that will drop the table. Default: false.
 924          * @param bool $fullpath Whether $patch is a full path. Default: false.
 925          * @return bool False if this was skipped because schema changes are skipped
 926          */
 927         public function dropTable( $table, $patch = false, $fullpath = false ) {
 928                 if ( !$this->doTable( $table ) ) {
 929                         return true;
 930                 }
 931
 932                 if ( $this->db->tableExists( $table, __METHOD__ ) ) {
 933                         $msg = "Dropping table $table";
 934
 935                         if ( $patch === false ) {
 936                                 $this->output( "$msg ..." );
 937                                 $this->db->dropTable( $table, __METHOD__ );
 938                                 $this->output( "done.\n" );
 939                         } else {
 940                                 return $this->applyPatch( $patch, $fullpath, $msg );
 941                         }
 942                 } else {
 943                         $this->output( "...$table doesn't exist.\n" );
 944                 }
 945
 946                 return true;
 947         }
 948
 949         /**
 950          * Modify an existing field
 951          *
 952          * @param string $table Name of the table to which the field belongs
 953          * @param string $field Name of the field to modify
 954          * @param string $patch Path to the patch file
 955          * @param bool $fullpath Whether to treat $patch path as a relative or not
 956          * @return bool False if this was skipped because schema changes are skipped
 957          */
 958         public function modifyField( $table, $field, $patch, $fullpath = false ) {
 959                 if ( !$this->doTable( $table ) ) {
 960                         return true;
 961                 }
 962
 963                 $updateKey = "$table-$field-$patch";
 964                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 965                         $this->output( "...$table table does not exist, skipping modify field patch.\n" );
 966                 } elseif ( !$this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 967                         $this->output( "...$field field does not exist in $table table, " .
 968                                 "skipping modify field patch.\n" );
 969                 } elseif ( $this->updateRowExists( $updateKey ) ) {
 970                         $this->output( "...$field in table $table already modified by patch $patch.\n" );
 971                 } else {
 972                         $apply = $this->applyPatch( $patch, $fullpath, "Modifying $field field of table $table" );
 973                         if ( $apply ) {
 974                                 $this->insertUpdateRow( $updateKey );
 975                         }
 976                         return $apply;
 977                 }
 978                 return true;
 979         }
 980
 981         /**
 982          * Modify an existing table, similar to modifyField. Intended for changes that
 983          *  touch more than one column on a table.
 984          *
 985          * @param string $table Name of the table to modify
 986          * @param string $patch Name of the patch file to apply
 987          * @param string|bool $fullpath Whether to treat $patch path as relative or not, defaults to false
 988          * @return bool False if this was skipped because of schema changes being skipped
 989          */
 990         public function modifyTable( $table, $patch, $fullpath = false ) {
 991                 if ( !$this->doTable( $table ) ) {
 992                         return true;
 993                 }
 994
 995                 $updateKey = "$table-$patch";
 996                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 997                         $this->output( "...$table table does not exist, skipping modify table patch.\n" );
 998                 } elseif ( $this->updateRowExists( $updateKey ) ) {
 999                         $this->output( "...table $table already modified by patch $patch.\n" );
1000                 } else {
1001                         $apply = $this->applyPatch( $patch, $fullpath, "Modifying table $table" );
1002                         if ( $apply ) {
1003                                 $this->insertUpdateRow( $updateKey );
1004                         }
1005                         return $apply;
1006                 }
1007                 return true;
1008         }
1009
1010         /**
1011          * Run a maintenance script
1012          *
1013          * This should only be used when the maintenance script must run before
1014          * later updates. If later updates don't depend on the script, add it to
1015          * DatabaseUpdater::$postDatabaseUpdateMaintenance instead.
1016          *
1017          * The script's execute() method must return true to indicate successful
1018          * completion, and must return false (or throw an exception) to indicate
1019          * unsuccessful completion.
1020          *
1021          * @since 1.32
1022          * @param string $class Maintenance subclass
1023          * @param string $script Script path and filename, usually "maintenance/fooBar.php"
1024          */
1025         public function runMaintenance( $class, $script ) {
1026                 $this->output( "Running $script...\n" );
1027                 $task = $this->maintenance->runChild( $class );
1028                 $ok = $task->execute();
1029                 if ( !$ok ) {
1030                         throw new RuntimeException( "Execution of $script did not complete successfully." );
1031                 }
1032                 $this->output( "done.\n" );
1033         }
1034
1035         /**
1036          * Set any .htaccess files or equivilent for storage repos
1037          *
1038          * Some zones (e.g. "temp") used to be public and may have been initialized as such
1039          */
1040         public function setFileAccess() {
1041                 $repo = RepoGroup::singleton()->getLocalRepo();
1042                 $zonePath = $repo->getZonePath( 'temp' );
1043                 if ( $repo->getBackend()->directoryExists( [ 'dir' => $zonePath ] ) ) {
1044                         // If the directory was never made, then it will have the right ACLs when it is made
1045                         $status = $repo->getBackend()->secure( [
1046                                 'dir' => $zonePath,
1047                                 'noAccess' => true,
1048                                 'noListing' => true
1049                         ] );
1050                         if ( $status->isOK() ) {
1051                                 $this->output( "Set the local repo temp zone container to be private.\n" );
1052                         } else {
1053                                 $this->output( "Failed to set the local repo temp zone container to be private.\n" );
1054                         }
1055                 }
1056         }
1057
1058         /**
1059          * Purge various database caches
1060          */
1061         public function purgeCache() {
1062                 global $wgLocalisationCacheConf;
1063                 // We can't guarantee that the user will be able to use TRUNCATE,
1064                 // but we know that DELETE is available to us
1065                 $this->output( "Purging caches..." );
1066
1067                 // ObjectCache
1068                 $this->db->delete( 'objectcache', '*', __METHOD__ );
1069
1070                 // LocalisationCache
1071                 if ( $wgLocalisationCacheConf['manualRecache'] ) {
1072                         $this->rebuildLocalisationCache();
1073                 }
1074
1075                 // ResourceLoader: Message cache
1076                 $blobStore = new MessageBlobStore();
1077                 $blobStore->clear();
1078
1079                 // ResourceLoader: File-dependency cache
1080                 $this->db->delete( 'module_deps', '*', __METHOD__ );
1081                 $this->output( "done.\n" );
1082         }
1083
1084         /**
1085          * Check the site_stats table is not properly populated.
1086          */
1087         protected function checkStats() {
1088                 $this->output( "...site_stats is populated..." );
1089                 $row = $this->db->selectRow( 'site_stats', '*', [ 'ss_row_id' => 1 ], __METHOD__ );
1090                 if ( $row === false ) {
1091                         $this->output( "data is missing! rebuilding...\n" );
1092                 } elseif ( isset( $row->site_stats ) && $row->ss_total_pages == -1 ) {
1093                         $this->output( "missing ss_total_pages, rebuilding...\n" );
1094                 } else {
1095                         $this->output( "done.\n" );
1096
1097                         return;
1098                 }
1099                 SiteStatsInit::doAllAndCommit( $this->db );
1100         }
1101
1102         # Common updater functions
1103
1104         /**
1105          * Sets the number of active users in the site_stats table
1106          */
1107         protected function doActiveUsersInit() {
1108                 $activeUsers = $this->db->selectField( 'site_stats', 'ss_active_users', '', __METHOD__ );
1109                 if ( $activeUsers == -1 ) {
1110                         $activeUsers = $this->db->selectField( 'recentchanges',
1111                                 'COUNT( DISTINCT rc_user_text )',
1112                                 [ 'rc_user != 0', 'rc_bot' => 0, "rc_log_type != 'newusers'" ], __METHOD__
1113                         );
1114                         $this->db->update( 'site_stats',
1115                                 [ 'ss_active_users' => intval( $activeUsers ) ],
1116                                 [ 'ss_row_id' => 1 ], __METHOD__, [ 'LIMIT' => 1 ]
1117                         );
1118                 }
1119                 $this->output( "...ss_active_users user count set...\n" );
1120         }
1121
1122         /**
1123          * Populates the log_user_text field in the logging table
1124          */
1125         protected function doLogUsertextPopulation() {
1126                 if ( !$this->updateRowExists( 'populate log_usertext' ) ) {
1127                         $this->output(
1128                                 "Populating log_user_text field, printing progress markers. For large\n" .
1129                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
1130                                 "maintenance/populateLogUsertext.php.\n"
1131                         );
1132
1133                         $task = $this->maintenance->runChild( PopulateLogUsertext::class );
1134                         $task->execute();
1135                         $this->output( "done.\n" );
1136                 }
1137         }
1138
1139         /**
1140          * Migrate log params to new table and index for searching
1141          */
1142         protected function doLogSearchPopulation() {
1143                 if ( !$this->updateRowExists( 'populate log_search' ) ) {
1144                         $this->output(
1145                                 "Populating log_search table, printing progress markers. For large\n" .
1146                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
1147                                 "maintenance/populateLogSearch.php.\n" );
1148
1149                         $task = $this->maintenance->runChild( PopulateLogSearch::class );
1150                         $task->execute();
1151                         $this->output( "done.\n" );
1152                 }
1153         }
1154
1155         /**
1156          * Updates the timestamps in the transcache table
1157          * @return bool
1158          */
1159         protected function doUpdateTranscacheField() {
1160                 if ( $this->updateRowExists( 'convert transcache field' ) ) {
1161                         $this->output( "...transcache tc_time already converted.\n" );
1162
1163                         return true;
1164                 }
1165
1166                 return $this->applyPatch( 'patch-tc-timestamp.sql', false,
1167                         "Converting tc_time from UNIX epoch to MediaWiki timestamp" );
1168         }
1169
1170         /**
1171          * Update CategoryLinks collation
1172          */
1173         protected function doCollationUpdate() {
1174                 global $wgCategoryCollation;
1175                 if ( $this->db->fieldExists( 'categorylinks', 'cl_collation', __METHOD__ ) ) {
1176                         if ( $this->db->selectField(
1177                                 'categorylinks',
1178                                 'COUNT(*)',
1179                                 'cl_collation != ' . $this->db->addQuotes( $wgCategoryCollation ),
1180                                 __METHOD__
1181                                 ) == 0
1182                         ) {
1183                                 $this->output( "...collations up-to-date.\n" );
1184
1185                                 return;
1186                         }
1187
1188                         $this->output( "Updating category collations..." );
1189                         $task = $this->maintenance->runChild( UpdateCollation::class );
1190                         $task->execute();
1191                         $this->output( "...done.\n" );
1192                 }
1193         }
1194
1195         /**
1196          * Migrates user options from the user table blob to user_properties
1197          */
1198         protected function doMigrateUserOptions() {
1199                 if ( $this->db->tableExists( 'user_properties' ) ) {
1200                         $cl = $this->maintenance->runChild( ConvertUserOptions::class, 'convertUserOptions.php' );
1201                         $cl->execute();
1202                         $this->output( "done.\n" );
1203                 }
1204         }
1205
1206         /**
1207          * Enable profiling table when it's turned on
1208          */
1209         protected function doEnableProfiling() {
1210                 global $wgProfiler;
1211
1212                 if ( !$this->doTable( 'profiling' ) ) {
1213                         return;
1214                 }
1215
1216                 $profileToDb = false;
1217                 if ( isset( $wgProfiler['output'] ) ) {
1218                         $out = $wgProfiler['output'];
1219                         if ( $out === 'db' ) {
1220                                 $profileToDb = true;
1221                         } elseif ( is_array( $out ) && in_array( 'db', $out ) ) {
1222                                 $profileToDb = true;
1223                         }
1224                 }
1225
1226                 if ( $profileToDb && !$this->db->tableExists( 'profiling', __METHOD__ ) ) {
1227                         $this->applyPatch( 'patch-profiling.sql', false, 'Add profiling table' );
1228                 }
1229         }
1230
1231         /**
1232          * Rebuilds the localisation cache
1233          */
1234         protected function rebuildLocalisationCache() {
1235                 /**
1236                  * @var $cl RebuildLocalisationCache
1237                  */
1238                 $cl = $this->maintenance->runChild(
1239                         RebuildLocalisationCache::class, 'rebuildLocalisationCache.php'
1240                 );
1241                 $this->output( "Rebuilding localisation cache...\n" );
1242                 $cl->setForce();
1243                 $cl->execute();
1244                 $this->output( "done.\n" );
1245         }
1246
1247         /**
1248          * Turns off content handler fields during parts of the upgrade
1249          * where they aren't available.
1250          */
1251         protected function disableContentHandlerUseDB() {
1252                 global $wgContentHandlerUseDB;
1253
1254                 if ( $wgContentHandlerUseDB ) {
1255                         $this->output( "Turning off Content Handler DB fields for this part of upgrade.\n" );
1256                         $this->holdContentHandlerUseDB = $wgContentHandlerUseDB;
1257                         $wgContentHandlerUseDB = false;
1258                 }
1259         }
1260
1261         /**
1262          * Turns content handler fields back on.
1263          */
1264         protected function enableContentHandlerUseDB() {
1265                 global $wgContentHandlerUseDB;
1266
1267                 if ( $this->holdContentHandlerUseDB ) {
1268                         $this->output( "Content Handler DB fields should be usable now.\n" );
1269                         $wgContentHandlerUseDB = $this->holdContentHandlerUseDB;
1270                 }
1271         }
1272
1273         /**
1274          * Migrate comments to the new 'comment' table
1275          * @since 1.30
1276          */
1277         protected function migrateComments() {
1278                 global $wgCommentTableSchemaMigrationStage;
1279                 if ( $wgCommentTableSchemaMigrationStage >= MIGRATION_WRITE_NEW &&
1280                         !$this->updateRowExists( 'MigrateComments' )
1281                 ) {
1282                         $this->output(
1283                                 "Migrating comments to the 'comments' table, printing progress markers. For large\n" .
1284                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
1285                                 "maintenance/migrateComments.php.\n"
1286                         );
1287                         $task = $this->maintenance->runChild( MigrateComments::class, 'migrateComments.php' );
1288                         $ok = $task->execute();
1289                         $this->output( $ok ? "done.\n" : "errors were encountered.\n" );
1290                 }
1291         }
1292
1293         /**
1294          * Migrate actors to the new 'actor' table
1295          * @since 1.31
1296          */
1297         protected function migrateActors() {
1298                 global $wgActorTableSchemaMigrationStage;
1299                 if ( $wgActorTableSchemaMigrationStage >= MIGRATION_WRITE_NEW &&
1300                         !$this->updateRowExists( 'MigrateActors' )
1301                 ) {
1302                         $this->output(
1303                                 "Migrating actors to the 'actor' table, printing progress markers. For large\n" .
1304                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
1305                                 "maintenance/migrateActors.php.\n"
1306                         );
1307                         $task = $this->maintenance->runChild( 'MigrateActors', 'migrateActors.php' );
1308                         $ok = $task->execute();
1309                         $this->output( $ok ? "done.\n" : "errors were encountered.\n" );
1310                 }
1311         }
1312
1313         /**
1314          * Migrate ar_text to modern storage
1315          * @since 1.31
1316          */
1317         protected function migrateArchiveText() {
1318                 if ( $this->db->fieldExists( 'archive', 'ar_text', __METHOD__ ) ) {
1319                         $this->output( "Migrating archive ar_text to modern storage.\n" );
1320                         $task = $this->maintenance->runChild( MigrateArchiveText::class, 'migrateArchiveText.php' );
1321                         $task->setForce();
1322                         if ( $task->execute() ) {
1323                                 $this->applyPatch( 'patch-drop-ar_text.sql', false,
1324                                         'Dropping ar_text and ar_flags columns' );
1325                         }
1326                 }
1327         }
1328
1329         /**
1330          * Populate ar_rev_id, then make it not nullable
1331          * @since 1.31
1332          */
1333          protected function populateArchiveRevId() {
1334                  $info = $this->db->fieldInfo( 'archive', 'ar_rev_id', __METHOD__ );
1335                  if ( !$info ) {
1336                          throw new MWException( 'Missing ar_rev_id field of archive table. Should not happen.' );
1337                  }
1338                  if ( $info->isNullable() ) {
1339                          $this->output( "Populating ar_rev_id.\n" );
1340                          $task = $this->maintenance->runChild( 'PopulateArchiveRevId', 'populateArchiveRevId.php' );
1341                          if ( $task->execute() ) {
1342                                  $this->applyPatch( 'patch-ar_rev_id-not-null.sql', false,
1343                                          'Making ar_rev_id not nullable' );
1344                          }
1345                  }
1346          }
1347
1348         /**
1349          * Populates the externallinks.el_index_60 field
1350          * @since 1.32
1351          */
1352         protected function populateExternallinksIndex60() {
1353                 if ( !$this->updateRowExists( 'populate externallinks.el_index_60' ) ) {
1354                         $this->output(
1355                                 "Populating el_index_60 field, printing progress markers. For large\n" .
1356                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
1357                                 "maintenance/populateExternallinksIndex60.php.\n"
1358                         );
1359                         $task = $this->maintenance->runChild( 'PopulateExternallinksIndex60',
1360                                 'populateExternallinksIndex60.php' );
1361                         $task->execute();
1362                         $this->output( "done.\n" );
1363                 }
1364         }
1365
1366         /**
1367          * Populates the MCR content tables
1368          * @since 1.32
1369          */
1370         protected function populateContentTables() {
1371                 global $wgMultiContentRevisionSchemaMigrationStage;
1372                 if ( ( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_NEW ) &&
1373                         !$this->updateRowExists( 'PopulateContentTables' )
1374                 ) {
1375                         $this->output(
1376                                 "Migrating revision data to the MCR 'slot' and 'content' tables, printing progress markers.\n" .
1377                                 "For large databases, you may want to hit Ctrl-C and do this manually with\n" .
1378                                 "maintenance/populateContentTables.php.\n"
1379                         );
1380                         $task = $this->maintenance->runChild(
1381                                 PopulateContentTables::class, 'populateContentTables.php'
1382                         );
1383                         $ok = $task->execute();
1384                         $this->output( $ok ? "done.\n" : "errors were encountered.\n" );
1385                         if ( $ok ) {
1386                                 $this->insertUpdateRow( 'PopulateContentTables' );
1387                         }
1388                 }
1389         }
1390 }