maintenance/namespaceDupes.php

   1 <?php
   2 /**
   3  * Check for articles to fix after adding/deleting namespaces
   4  *
   5  * Copyright © 2005-2007 Brion Vibber <brion@pobox.com>
   6  * https://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Maintenance
  25  */
  26
  27 require_once __DIR__ . '/Maintenance.php';
  28
  29 use MediaWiki\Linker\LinkTarget;
  30 use MediaWiki\MediaWikiServices;
  31 use Wikimedia\Rdbms\IResultWrapper;
  32 use Wikimedia\Rdbms\IMaintainableDatabase;
  33
  34 /**
  35  * Maintenance script that checks for articles to fix after
  36  * adding/deleting namespaces.
  37  *
  38  * @ingroup Maintenance
  39  */
  40 class NamespaceDupes extends Maintenance {
  41
  42         /**
  43          * @var IMaintainableDatabase
  44          */
  45         protected $db;
  46
  47         private $resolvablePages = 0;
  48         private $totalPages = 0;
  49
  50         private $resolvableLinks = 0;
  51         private $totalLinks = 0;
  52
  53         public function __construct() {
  54                 parent::__construct();
  55                 $this->addDescription( 'Find and fix pages affected by namespace addition/removal' );
  56                 $this->addOption( 'fix', 'Attempt to automatically fix errors' );
  57                 $this->addOption( 'merge', "Instead of renaming conflicts, do a history merge with " .
  58                         "the correct title" );
  59                 $this->addOption( 'add-suffix', "Dupes will be renamed with correct namespace with " .
  60                         "<text> appended after the article name", false, true );
  61                 $this->addOption( 'add-prefix', "Dupes will be renamed with correct namespace with " .
  62                         "<text> prepended before the article name", false, true );
  63                 $this->addOption( 'source-pseudo-namespace', "Move all pages with the given source " .
  64                         "prefix (with an implied colon following it). If --dest-namespace is not specified, " .
  65                         "the colon will be replaced with a hyphen.",
  66                         false, true );
  67                 $this->addOption( 'dest-namespace', "In combination with --source-pseudo-namespace, " .
  68                         "specify the namespace ID of the destination.", false, true );
  69                 $this->addOption( 'move-talk', "If this is specified, pages in the Talk namespace that " .
  70                         "begin with a conflicting prefix will be renamed, for example " .
  71                         "Talk:File:Foo -> File_Talk:Foo" );
  72         }
  73
  74         public function execute() {
  75                 $options = [
  76                         'fix' => $this->hasOption( 'fix' ),
  77                         'merge' => $this->hasOption( 'merge' ),
  78                         'add-suffix' => $this->getOption( 'add-suffix', '' ),
  79                         'add-prefix' => $this->getOption( 'add-prefix', '' ),
  80                         'move-talk' => $this->hasOption( 'move-talk' ),
  81                         'source-pseudo-namespace' => $this->getOption( 'source-pseudo-namespace', '' ),
  82                         'dest-namespace' => intval( $this->getOption( 'dest-namespace', 0 ) ) ];
  83
  84                 if ( $options['source-pseudo-namespace'] !== '' ) {
  85                         $retval = $this->checkPrefix( $options );
  86                 } else {
  87                         $retval = $this->checkAll( $options );
  88                 }
  89
  90                 if ( $retval ) {
  91                         $this->output( "\nLooks good!\n" );
  92                 } else {
  93                         $this->output( "\nOh noeees\n" );
  94                 }
  95         }
  96
  97         /**
  98          * Check all namespaces
  99          *
 100          * @param array $options Associative array of validated command-line options
 101          *
 102          * @return bool
 103          */
 104         private function checkAll( $options ) {
 105                 global $wgNamespaceAliases, $wgCapitalLinks;
 106
 107                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
 108                 $spaces = [];
 109
 110                 // List interwikis first, so they'll be overridden
 111                 // by any conflicting local namespaces.
 112                 foreach ( $this->getInterwikiList() as $prefix ) {
 113                         $name = $contLang->ucfirst( $prefix );
 114                         $spaces[$name] = 0;
 115                 }
 116
 117                 // Now pull in all canonical and alias namespaces...
 118                 foreach (
 119                         MediaWikiServices::getInstance()->getNamespaceInfo()->getCanonicalNamespaces()
 120                         as $ns => $name
 121                 ) {
 122                         // This includes $wgExtraNamespaces
 123                         if ( $name !== '' ) {
 124                                 $spaces[$name] = $ns;
 125                         }
 126                 }
 127                 foreach ( $contLang->getNamespaces() as $ns => $name ) {
 128                         if ( $name !== '' ) {
 129                                 $spaces[$name] = $ns;
 130                         }
 131                 }
 132                 foreach ( $wgNamespaceAliases as $name => $ns ) {
 133                         $spaces[$name] = $ns;
 134                 }
 135                 foreach ( $contLang->getNamespaceAliases() as $name => $ns ) {
 136                         $spaces[$name] = $ns;
 137                 }
 138
 139                 // We'll need to check for lowercase keys as well,
 140                 // since we're doing case-sensitive searches in the db.
 141                 foreach ( $spaces as $name => $ns ) {
 142                         $moreNames = [];
 143                         $moreNames[] = $contLang->uc( $name );
 144                         $moreNames[] = $contLang->ucfirst( $contLang->lc( $name ) );
 145                         $moreNames[] = $contLang->ucwords( $name );
 146                         $moreNames[] = $contLang->ucwords( $contLang->lc( $name ) );
 147                         $moreNames[] = $contLang->ucwordbreaks( $name );
 148                         $moreNames[] = $contLang->ucwordbreaks( $contLang->lc( $name ) );
 149                         if ( !$wgCapitalLinks ) {
 150                                 foreach ( $moreNames as $altName ) {
 151                                         $moreNames[] = $contLang->lcfirst( $altName );
 152                                 }
 153                                 $moreNames[] = $contLang->lcfirst( $name );
 154                         }
 155                         foreach ( array_unique( $moreNames ) as $altName ) {
 156                                 if ( $altName !== $name ) {
 157                                         $spaces[$altName] = $ns;
 158                                 }
 159                         }
 160                 }
 161
 162                 // Sort by namespace index, and if there are two with the same index,
 163                 // break the tie by sorting by name
 164                 $origSpaces = $spaces;
 165                 uksort( $spaces, function ( $a, $b ) use ( $origSpaces ) {
 166                         return $origSpaces[$a] <=> $origSpaces[$b]
 167                                 ?: $a <=> $b;
 168                 } );
 169
 170                 $ok = true;
 171                 foreach ( $spaces as $name => $ns ) {
 172                         $ok = $this->checkNamespace( $ns, $name, $options ) && $ok;
 173                 }
 174
 175                 $this->output( "{$this->totalPages} pages to fix, " .
 176                         "{$this->resolvablePages} were resolvable.\n\n" );
 177
 178                 foreach ( $spaces as $name => $ns ) {
 179                         if ( $ns != 0 ) {
 180                                 /* Fix up link destinations for non-interwiki links only.
 181                                  *
 182                                  * For example if a page has [[Foo:Bar]] and then a Foo namespace
 183                                  * is introduced, pagelinks needs to be updated to have
 184                                  * page_namespace = NS_FOO.
 185                                  *
 186                                  * If instead an interwiki prefix was introduced called "Foo",
 187                                  * the link should instead be moved to the iwlinks table. If a new
 188                                  * language is introduced called "Foo", or if there is a pagelink
 189                                  * [[fr:Bar]] when interlanguage magic links are turned on, the
 190                                  * link would have to be moved to the langlinks table. Let's put
 191                                  * those cases in the too-hard basket for now. The consequences are
 192                                  * not especially severe.
 193                                  * @fixme Handle interwiki links, and pagelinks to Category:, File:
 194                                  * which probably need reparsing.
 195                                  */
 196
 197                                 $this->checkLinkTable( 'pagelinks', 'pl', $ns, $name, $options );
 198                                 $this->checkLinkTable( 'templatelinks', 'tl', $ns, $name, $options );
 199
 200                                 // The redirect table has interwiki links randomly mixed in, we
 201                                 // need to filter those out. For example [[w:Foo:Bar]] would
 202                                 // have rd_interwiki=w and rd_namespace=0, which would match the
 203                                 // query for a conflicting namespace "Foo" if filtering wasn't done.
 204                                 $this->checkLinkTable( 'redirect', 'rd', $ns, $name, $options,
 205                                         [ 'rd_interwiki' => null ] );
 206                                 $this->checkLinkTable( 'redirect', 'rd', $ns, $name, $options,
 207                                         [ 'rd_interwiki' => '' ] );
 208                         }
 209                 }
 210
 211                 $this->output( "{$this->totalLinks} links to fix, " .
 212                         "{$this->resolvableLinks} were resolvable.\n" );
 213
 214                 return $ok;
 215         }
 216
 217         /**
 218          * Get the interwiki list
 219          *
 220          * @return array
 221          */
 222         private function getInterwikiList() {
 223                 $result = MediaWikiServices::getInstance()->getInterwikiLookup()->getAllPrefixes();
 224                 $prefixes = [];
 225                 foreach ( $result as $row ) {
 226                         $prefixes[] = $row['iw_prefix'];
 227                 }
 228
 229                 return $prefixes;
 230         }
 231
 232         /**
 233          * Check a given prefix and try to move it into the given destination namespace
 234          *
 235          * @param int $ns Destination namespace id
 236          * @param string $name
 237          * @param array $options Associative array of validated command-line options
 238          * @return bool
 239          */
 240         private function checkNamespace( $ns, $name, $options ) {
 241                 $targets = $this->getTargetList( $ns, $name, $options );
 242                 $count = $targets->numRows();
 243                 $this->totalPages += $count;
 244                 if ( $count == 0 ) {
 245                         return true;
 246                 }
 247
 248                 $dryRunNote = $options['fix'] ? '' : ' DRY RUN ONLY';
 249
 250                 $ok = true;
 251                 foreach ( $targets as $row ) {
 252                         // Find the new title and determine the action to take
 253
 254                         $newTitle = $this->getDestinationTitle(
 255                                 $ns, $name, $row->page_namespace, $row->page_title );
 256                         $logStatus = false;
 257                         if ( !$newTitle ) {
 258                                 $logStatus = 'invalid title';
 259                                 $action = 'abort';
 260                         } elseif ( $newTitle->exists() ) {
 261                                 if ( $options['merge'] ) {
 262                                         if ( $this->canMerge( $row->page_id, $newTitle, $logStatus ) ) {
 263                                                 $action = 'merge';
 264                                         } else {
 265                                                 $action = 'abort';
 266                                         }
 267                                 } elseif ( $options['add-prefix'] == '' && $options['add-suffix'] == '' ) {
 268                                         $action = 'abort';
 269                                         $logStatus = 'dest title exists and --add-prefix not specified';
 270                                 } else {
 271                                         $newTitle = $this->getAlternateTitle( $newTitle, $options );
 272                                         if ( !$newTitle ) {
 273                                                 $action = 'abort';
 274                                                 $logStatus = 'alternate title is invalid';
 275                                         } elseif ( $newTitle->exists() ) {
 276                                                 $action = 'abort';
 277                                                 $logStatus = 'title conflict';
 278                                         } else {
 279                                                 $action = 'move';
 280                                                 $logStatus = 'alternate';
 281                                         }
 282                                 }
 283                         } else {
 284                                 $action = 'move';
 285                                 $logStatus = 'no conflict';
 286                         }
 287
 288                         // Take the action or log a dry run message
 289
 290                         $logTitle = "id={$row->page_id} ns={$row->page_namespace} dbk={$row->page_title}";
 291                         $pageOK = true;
 292
 293                         switch ( $action ) {
 294                                 case 'abort':
 295                                         $this->output( "$logTitle *** $logStatus\n" );
 296                                         $pageOK = false;
 297                                         break;
 298                                 case 'move':
 299                                         $this->output( "$logTitle -> " .
 300                                                 $newTitle->getPrefixedDBkey() . " ($logStatus)$dryRunNote\n" );
 301
 302                                         if ( $options['fix'] ) {
 303                                                 $pageOK = $this->movePage( $row->page_id, $newTitle );
 304                                         }
 305                                         break;
 306                                 case 'merge':
 307                                         $this->output( "$logTitle => " .
 308                                                 $newTitle->getPrefixedDBkey() . " (merge)$dryRunNote\n" );
 309
 310                                         if ( $options['fix'] ) {
 311                                                 $pageOK = $this->mergePage( $row, $newTitle );
 312                                         }
 313                                         break;
 314                         }
 315
 316                         if ( $pageOK ) {
 317                                 $this->resolvablePages++;
 318                         } else {
 319                                 $ok = false;
 320                         }
 321                 }
 322
 323                 return $ok;
 324         }
 325
 326         /**
 327          * Check and repair the destination fields in a link table
 328          * @param string $table The link table name
 329          * @param string $fieldPrefix The field prefix in the link table
 330          * @param int $ns Destination namespace id
 331          * @param string $name
 332          * @param array $options Associative array of validated command-line options
 333          * @param array $extraConds Extra conditions for the SQL query
 334          */
 335         private function checkLinkTable( $table, $fieldPrefix, $ns, $name, $options,
 336                 $extraConds = []
 337         ) {
 338                 $dbw = $this->getDB( DB_MASTER );
 339
 340                 $batchConds = [];
 341                 $fromField = "{$fieldPrefix}_from";
 342                 $namespaceField = "{$fieldPrefix}_namespace";
 343                 $titleField = "{$fieldPrefix}_title";
 344                 $batchSize = 500;
 345                 while ( true ) {
 346                         $res = $dbw->select(
 347                                 $table,
 348                                 [ $fromField, $namespaceField, $titleField ],
 349                                 array_merge( $batchConds, $extraConds, [
 350                                         $namespaceField => 0,
 351                                         $titleField . $dbw->buildLike( "$name:", $dbw->anyString() )
 352                                 ] ),
 353                                 __METHOD__,
 354                                 [
 355                                         'ORDER BY' => [ $titleField, $fromField ],
 356                                         'LIMIT' => $batchSize
 357                                 ]
 358                         );
 359
 360                         if ( $res->numRows() == 0 ) {
 361                                 break;
 362                         }
 363                         foreach ( $res as $row ) {
 364                                 $logTitle = "from={$row->$fromField} ns={$row->$namespaceField} " .
 365                                         "dbk={$row->$titleField}";
 366                                 $destTitle = $this->getDestinationTitle(
 367                                         $ns, $name, $row->$namespaceField, $row->$titleField );
 368                                 $this->totalLinks++;
 369                                 if ( !$destTitle ) {
 370                                         $this->output( "$table $logTitle *** INVALID\n" );
 371                                         continue;
 372                                 }
 373                                 $this->resolvableLinks++;
 374                                 if ( !$options['fix'] ) {
 375                                         $this->output( "$table $logTitle -> " .
 376                                                 $destTitle->getPrefixedDBkey() . " DRY RUN\n" );
 377                                         continue;
 378                                 }
 379
 380                                 $dbw->update( $table,
 381                                         // SET
 382                                         [
 383                                                 $namespaceField => $destTitle->getNamespace(),
 384                                                 $titleField => $destTitle->getDBkey()
 385                                         ],
 386                                         // WHERE
 387                                         [
 388                                                 $namespaceField => 0,
 389                                                 $titleField => $row->$titleField,
 390                                                 $fromField => $row->$fromField
 391                                         ],
 392                                         __METHOD__,
 393                                         [ 'IGNORE' ]
 394                                 );
 395                                 $this->output( "$table $logTitle -> " .
 396                                         $destTitle->getPrefixedDBkey() . "\n" );
 397                         }
 398                         $encLastTitle = $dbw->addQuotes( $row->$titleField );
 399                         $encLastFrom = $dbw->addQuotes( $row->$fromField );
 400
 401                         $batchConds = [
 402                                 "$titleField > $encLastTitle " .
 403                                 "OR ($titleField = $encLastTitle AND $fromField > $encLastFrom)" ];
 404
 405                         wfWaitForSlaves();
 406                 }
 407         }
 408
 409         /**
 410          * Move the given pseudo-namespace, either replacing the colon with a hyphen
 411          * (useful for pseudo-namespaces that conflict with interwiki links) or move
 412          * them to another namespace if specified.
 413          * @param array $options Associative array of validated command-line options
 414          * @return bool
 415          */
 416         private function checkPrefix( $options ) {
 417                 $prefix = $options['source-pseudo-namespace'];
 418                 $ns = $options['dest-namespace'];
 419                 $this->output( "Checking prefix \"$prefix\" vs namespace $ns\n" );
 420
 421                 return $this->checkNamespace( $ns, $prefix, $options );
 422         }
 423
 424         /**
 425          * Find pages in main and talk namespaces that have a prefix of the new
 426          * namespace so we know titles that will need migrating
 427          *
 428          * @param int $ns Destination namespace id
 429          * @param string $name Prefix that is being made a namespace
 430          * @param array $options Associative array of validated command-line options
 431          *
 432          * @return IResultWrapper
 433          */
 434         private function getTargetList( $ns, $name, $options ) {
 435                 $dbw = $this->getDB( DB_MASTER );
 436
 437                 if (
 438                         $options['move-talk'] &&
 439                         MediaWikiServices::getInstance()->getNamespaceInfo()->isSubject( $ns )
 440                 ) {
 441                         $checkNamespaces = [ NS_MAIN, NS_TALK ];
 442                 } else {
 443                         $checkNamespaces = NS_MAIN;
 444                 }
 445
 446                 return $dbw->select( 'page',
 447                         [
 448                                 'page_id',
 449                                 'page_title',
 450                                 'page_namespace',
 451                         ],
 452                         [
 453                                 'page_namespace' => $checkNamespaces,
 454                                 'page_title' . $dbw->buildLike( "$name:", $dbw->anyString() ),
 455                         ],
 456                         __METHOD__
 457                 );
 458         }
 459
 460         /**
 461          * Get the preferred destination title for a given target page.
 462          * @param int $ns The destination namespace ID
 463          * @param string $name The conflicting prefix
 464          * @param int $sourceNs The source namespace
 465          * @param int $sourceDbk The source DB key (i.e. page_title)
 466          * @return Title|false
 467          */
 468         private function getDestinationTitle( $ns, $name, $sourceNs, $sourceDbk ) {
 469                 $dbk = substr( $sourceDbk, strlen( "$name:" ) );
 470                 if ( $ns == 0 ) {
 471                         // An interwiki; try an alternate encoding with '-' for ':'
 472                         $dbk = "$name-" . $dbk;
 473                 }
 474                 $destNS = $ns;
 475                 $nsInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
 476                 if ( $sourceNs == NS_TALK && $nsInfo->isSubject( $ns ) ) {
 477                         // This is an associated talk page moved with the --move-talk feature.
 478                         $destNS = $nsInfo->getTalk( $destNS );
 479                 }
 480                 $newTitle = Title::makeTitleSafe( $destNS, $dbk );
 481                 if ( !$newTitle || !$newTitle->canExist() ) {
 482                         return false;
 483                 }
 484                 return $newTitle;
 485         }
 486
 487         /**
 488          * Get an alternative title to move a page to. This is used if the
 489          * preferred destination title already exists.
 490          *
 491          * @param LinkTarget $linkTarget
 492          * @param array $options Associative array of validated command-line options
 493          * @return Title|bool
 494          */
 495         private function getAlternateTitle( LinkTarget $linkTarget, $options ) {
 496                 $prefix = $options['add-prefix'];
 497                 $suffix = $options['add-suffix'];
 498                 if ( $prefix == '' && $suffix == '' ) {
 499                         return false;
 500                 }
 501                 while ( true ) {
 502                         $dbk = $prefix . $linkTarget->getDBkey() . $suffix;
 503                         $title = Title::makeTitleSafe( $linkTarget->getNamespace(), $dbk );
 504                         if ( !$title ) {
 505                                 return false;
 506                         }
 507                         if ( !$title->exists() ) {
 508                                 return $title;
 509                         }
 510                 }
 511         }
 512
 513         /**
 514          * Move a page
 515          *
 516          * @param integer $id The page_id
 517          * @param LinkTarget $newLinkTarget The new title link target
 518          * @return bool
 519          */
 520         private function movePage( $id, LinkTarget $newLinkTarget ) {
 521                 $dbw = $this->getDB( DB_MASTER );
 522
 523                 $dbw->update( 'page',
 524                         [
 525                                 "page_namespace" => $newLinkTarget->getNamespace(),
 526                                 "page_title" => $newLinkTarget->getDBkey(),
 527                         ],
 528                         [
 529                                 "page_id" => $id,
 530                         ],
 531                         __METHOD__ );
 532
 533                 // Update *_from_namespace in links tables
 534                 $fromNamespaceTables = [
 535                         [ 'pagelinks', 'pl' ],
 536                         [ 'templatelinks', 'tl' ],
 537                         [ 'imagelinks', 'il' ] ];
 538                 foreach ( $fromNamespaceTables as $tableInfo ) {
 539                         list( $table, $fieldPrefix ) = $tableInfo;
 540                         $dbw->update( $table,
 541                                 // SET
 542                                 [ "{$fieldPrefix}_from_namespace" => $newLinkTarget->getNamespace() ],
 543                                 // WHERE
 544                                 [ "{$fieldPrefix}_from" => $id ],
 545                                 __METHOD__ );
 546                 }
 547
 548                 return true;
 549         }
 550
 551         /**
 552          * Determine if we can merge a page.
 553          * We check if an inaccessible revision would become the latest and
 554          * deny the merge if so -- it's theoretically possible to update the
 555          * latest revision, but opens a can of worms -- search engine updates,
 556          * recentchanges review, etc.
 557          *
 558          * @param integer $id The page_id
 559          * @param LinkTarget $linkTarget The new link target
 560          * @param string $logStatus This is set to the log status message on failure
 561          * @return bool
 562          */
 563         private function canMerge( $id, LinkTarget $linkTarget, &$logStatus ) {
 564                 $latestDest = Revision::newFromTitle( $linkTarget, 0, Revision::READ_LATEST );
 565                 $latestSource = Revision::newFromPageId( $id, 0, Revision::READ_LATEST );
 566                 if ( $latestSource->getTimestamp() > $latestDest->getTimestamp() ) {
 567                         $logStatus = 'cannot merge since source is later';
 568                         return false;
 569                 } else {
 570                         return true;
 571                 }
 572         }
 573
 574         /**
 575          * Merge page histories
 576          *
 577          * @param stdClass $row Page row
 578          * @param Title $newTitle The new title
 579          * @return bool
 580          */
 581         private function mergePage( $row, Title $newTitle ) {
 582                 $dbw = $this->getDB( DB_MASTER );
 583
 584                 $id = $row->page_id;
 585
 586                 // Construct the WikiPage object we will need later, while the
 587                 // page_id still exists. Note that this cannot use makeTitleSafe(),
 588                 // we are deliberately constructing an invalid title.
 589                 $sourceTitle = Title::makeTitle( $row->page_namespace, $row->page_title );
 590                 $sourceTitle->resetArticleID( $id );
 591                 $wikiPage = new WikiPage( $sourceTitle );
 592                 $wikiPage->loadPageData( 'fromdbmaster' );
 593
 594                 $destId = $newTitle->getArticleID();
 595                 $this->beginTransaction( $dbw, __METHOD__ );
 596                 $dbw->update( 'revision',
 597                         // SET
 598                         [ 'rev_page' => $destId ],
 599                         // WHERE
 600                         [ 'rev_page' => $id ],
 601                         __METHOD__ );
 602
 603                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
 604
 605                 $this->commitTransaction( $dbw, __METHOD__ );
 606
 607                 /* Call LinksDeletionUpdate to delete outgoing links from the old title,
 608                  * and update category counts.
 609                  *
 610                  * Calling external code with a fake broken Title is a fairly dubious
 611                  * idea. It's necessary because it's quite a lot of code to duplicate,
 612                  * but that also makes it fragile since it would be easy for someone to
 613                  * accidentally introduce an assumption of title validity to the code we
 614                  * are calling.
 615                  */
 616                 DeferredUpdates::addUpdate( new LinksDeletionUpdate( $wikiPage ) );
 617                 DeferredUpdates::doUpdates();
 618
 619                 return true;
 620         }
 621 }
 622
 623 $maintClass = NamespaceDupes::class;
 624 require_once RUN_MAINTENANCE_IF_MAIN;