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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Maintenance
*/
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\Title\Title;
/**
* Maintenance script that clears rows of pages corrupted by MergeHistory, those
* pages 'exist' but have no visible revision.
*
* These pages are completely inaccessible via the UI due to revision/title mismatch
* exceptions in RevisionStore and elsewhere.
*
* These are rows in page_table that have 'page_latest' entry with corresponding
* 'rev_id' but no associated 'rev_page' entry in revision table. Such rows create
* ghost pages because their 'page_latest' is actually living on different pages
* (which possess the associated 'rev_page' on revision table now).
*
* @see https://phabricator.wikimedia.org/T263340
* @see https://phabricator.wikimedia.org/T259022
*/
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->getReplicaDB();
$dbw = $this->getPrimaryDB();
$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->newSelectQueryBuilder()
->select( 'MAX(rev_id)' )
->from( 'revision' )
->where( [ 'rev_page' => $row->page_id ] )
->caller( __METHOD__ )->fetchField();
if ( !$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->newDeleteQueryBuilder()
->deleteFrom( 'page' )
->where( [ 'page_id' => $row->page_id ] )
->caller( __METHOD__ )->execute();
}
$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->newUpdateQueryBuilder()
->update( 'page' )
->set( [ 'page_latest' => $revId ] )
->where( [ 'page_id' => $row->page_id ] )
->caller( __METHOD__ )->execute();
}
$numUpdated++;
}
}
if ( !$dryRun ) {
$this->output( "Updated $numUpdated row(s), deleted $numDeleted row(s)\n" );
}
}
}
// @codeCoverageIgnoreStart
$maintClass = FixMergeHistoryCorruption::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd