134 lines
4.3 KiB
PHP
134 lines
4.3 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Maintenance
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*/
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require_once __DIR__ . '/Maintenance.php';
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/**
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* Maintenance script that clears rows of pages corrupted by MergeHistory, those
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* pages 'exist' but have no visible revision.
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*
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* These pages are completely inacessible via the UI due to revision/title mismatch
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* exceptions in RevisionStore and elsewhere.
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*
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* These are rows in page_table that have 'page_latest' entry with corresponding
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* 'rev_id' but no associated 'rev_page' entry in revision table. Such rows create
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* ghost pages because their 'page_latest' is actually living on different pages
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* (which possess the associated 'rev_page' on revision table now).
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*
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* @see https://phabricator.wikimedia.org/T263340
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* @see https://phabricator.wikimedia.org/T259022
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*/
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class FixMergeHistoryCorruption extends Maintenance {
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public function __construct() {
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parent::__construct();
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$this->addDescription( 'Delete pages corrupted by MergeHistory' );
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$this->addOption( 'ns', 'Namespace to restrict the query', false, true );
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$this->addOption( 'dry-run', 'Run in dry-mode' );
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$this->addOption( 'delete', 'Actually delete the found rows' );
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}
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public function execute() {
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$dbr = $this->getDB( DB_REPLICA );
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$dbw = $this->getDB( DB_PRIMARY );
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$dryRun = true;
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if ( $this->hasOption( 'dry-run' ) && $this->hasOption( 'delete' ) ) {
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$this->fatalError( 'Cannot do both --dry-run and --delete.' );
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} elseif ( $this->hasOption( 'delete' ) ) {
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$dryRun = false;
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} elseif ( !$this->hasOption( 'dry-run' ) ) {
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$this->fatalError( 'Either --dry-run or --delete must be specified.' );
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}
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$conds = [ 'page_id<>rev_page' ];
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if ( $this->hasOption( 'ns' ) ) {
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$conds['page_namespace'] = (int)$this->getOption( 'ns' );
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}
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$res = $dbr->newSelectQueryBuilder()
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->from( 'page' )
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->join( 'revision', null, 'page_latest=rev_id' )
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->fields( [ 'page_namespace', 'page_title', 'page_id' ] )
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->where( $conds )
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->caller( __METHOD__ )
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->fetchResultSet();
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$count = $res->numRows();
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if ( !$count ) {
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$this->output( "Nothing was found, no page matches the criteria.\n" );
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return;
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}
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$numDeleted = 0;
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$numUpdated = 0;
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foreach ( $res as $row ) {
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$title = Title::makeTitleSafe( $row->page_namespace, $row->page_title );
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if ( !$title ) {
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$this->output( "Skipping invalid title with page_id: $row->page_id\n" );
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continue;
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}
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$titleText = $title->getPrefixedDBkey();
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// Check if there are any revisions that have this $row->page_id as their
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// rev_page and select the largest which should be the newest revision.
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$revId = $dbr->selectField(
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'revision',
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'MAX(rev_id)',
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[ 'rev_page' => $row->page_id ],
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__METHOD__
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);
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if ( !$revId ) {
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if ( $dryRun ) {
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$this->output( "Would delete $titleText with page_id: $row->page_id\n" );
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} else {
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$this->output( "Deleting $titleText with page_id: $row->page_id\n" );
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$dbw->delete( 'page', [ 'page_id' => $row->page_id ], __METHOD__ );
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}
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$numDeleted++;
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} else {
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if ( $dryRun ) {
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$this->output( "Would update page_id $row->page_id to page_latest $revId\n" );
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} else {
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$this->output( "Updating page_id $row->page_id to page_latest $revId\n" );
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$dbw->update(
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'page',
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[ 'page_latest' => $revId ],
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[ 'page_id' => $row->page_id ],
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__METHOD__
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);
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}
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$numUpdated++;
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}
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}
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if ( !$dryRun ) {
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$this->output( "Updated $numUpdated row(s), deleted $numDeleted row(s)\n" );
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}
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}
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}
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$maintClass = FixMergeHistoryCorruption::class;
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require_once RUN_MAINTENANCE_IF_MAIN;
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