fixMergeHistoryCorruption.php

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<?php
require_once __DIR__ . '/Maintenance.php';
 
use MediaWiki\Title\Title;
 
class FixMergeHistoryCorruption extends Maintenance {
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Delete pages corrupted by MergeHistory' );
        $this->addOption( 'ns', 'Namespace to restrict the query', false, true );
        $this->addOption( 'dry-run', 'Run in dry-mode' );
        $this->addOption( 'delete', 'Actually delete the found rows' );
    }
 
    public function execute() {
        $dbr = $this->getDB( DB_REPLICA );
        $dbw = $this->getDB( DB_PRIMARY );
 
        $dryRun = true;
        if ( $this->hasOption( 'dry-run' ) && $this->hasOption( 'delete' ) ) {
            $this->fatalError( 'Cannot do both --dry-run and --delete.' );
        } elseif ( $this->hasOption( 'delete' ) ) {
            $dryRun = false;
        } elseif ( !$this->hasOption( 'dry-run' ) ) {
            $this->fatalError( 'Either --dry-run or --delete must be specified.' );
        }
 
        $conds = [ 'page_id<>rev_page' ];
        if ( $this->hasOption( 'ns' ) ) {
            $conds['page_namespace'] = (int)$this->getOption( 'ns' );
        }
 
        $res = $dbr->newSelectQueryBuilder()
            ->from( 'page' )
            ->join( 'revision', null, 'page_latest=rev_id' )
            ->fields( [ 'page_namespace', 'page_title', 'page_id' ] )
            ->where( $conds )
            ->caller( __METHOD__ )
            ->fetchResultSet();
 
        $count = $res->numRows();
 
        if ( !$count ) {
            $this->output( "Nothing was found, no page matches the criteria.\n" );
            return;
        }
 
        $numDeleted = 0;
        $numUpdated = 0;
 
        foreach ( $res as $row ) {
            $title = Title::makeTitleSafe( $row->page_namespace, $row->page_title );
            if ( !$title ) {
                $this->output( "Skipping invalid title with page_id: $row->page_id\n" );
                continue;
            }
            $titleText = $title->getPrefixedDBkey();
 
            // Check if there are any revisions that have this $row->page_id as their
            // rev_page and select the largest which should be the newest revision.
            $revId = $dbr->selectField(
                'revision',
                'MAX(rev_id)',
                [ 'rev_page' => $row->page_id ],
                __METHOD__
            );
 
            if ( !$revId ) {
                if ( $dryRun ) {
                    $this->output( "Would delete $titleText with page_id: $row->page_id\n" );
                } else {
                    $this->output( "Deleting $titleText with page_id: $row->page_id\n" );
                    $dbw->delete( 'page', [ 'page_id' => $row->page_id ], __METHOD__ );
                }
                $numDeleted++;
            } else {
                if ( $dryRun ) {
                    $this->output( "Would update page_id $row->page_id to page_latest $revId\n" );
                } else {
                    $this->output( "Updating page_id $row->page_id to page_latest $revId\n" );
                    $dbw->update(
                        'page',
                        [ 'page_latest' => $revId ],
                        [ 'page_id' => $row->page_id ],
                        __METHOD__
                    );
                }
                $numUpdated++;
            }
        }
 
        if ( !$dryRun ) {
            $this->output( "Updated $numUpdated row(s), deleted $numDeleted row(s)\n" );
        }
    }
}
 
$maintClass = FixMergeHistoryCorruption::class;
require_once RUN_MAINTENANCE_IF_MAIN;