fixDoubleRedirects.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class FixDoubleRedirects extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Script to fix double redirects' );
        $this->addOption( 'async', 'Don\'t fix anything directly, just queue the jobs' );
        $this->addOption( 'title', 'Fix only redirects pointing to this page', false, true );
        $this->addOption( 'dry-run', 'Perform a dry run, fix nothing' );
    }

    public function execute() {
        $async = $this->hasOption( 'async' );
        $dryrun = $this->hasOption( 'dry-run' );

        if ( $this->hasOption( 'title' ) ) {
            $title = Title::newFromText( $this->getOption( 'title' ) );
            if ( !$title || !$title->isRedirect() ) {
                $this->fatalError( $title->getPrefixedText() . " is not a redirect!\n" );
            }
        } else {
            $title = null;
        }

        $dbr = $this->getDB( DB_REPLICA );

        // See also SpecialDoubleRedirects
        $tables = [
            'redirect',
            'pa' => 'page',
            'pb' => 'page',
        ];
        $fields = [
            'pa.page_namespace AS pa_namespace',
            'pa.page_title AS pa_title',
            'pb.page_namespace AS pb_namespace',
            'pb.page_title AS pb_title',
        ];
        $conds = [
            'rd_from = pa.page_id',
            'rd_namespace = pb.page_namespace',
            'rd_title = pb.page_title',
            'rd_interwiki IS NULL OR rd_interwiki = ' . $dbr->addQuotes( '' ), // T42352
            'pb.page_is_redirect' => 1,
        ];

        if ( $title != null ) {
            $conds['pb.page_namespace'] = $title->getNamespace();
            $conds['pb.page_title'] = $title->getDBkey();
        }
        // TODO: support batch querying

        $res = $dbr->select( $tables, $fields, $conds, __METHOD__ );

        if ( !$res->numRows() ) {
            $this->output( "No double redirects found.\n" );

            return;
        }

        $jobs = [];
        $processedTitles = "\n";
        $n = 0;
        foreach ( $res as $row ) {
            $titleA = Title::makeTitle( $row->pa_namespace, $row->pa_title );
            $titleB = Title::makeTitle( $row->pb_namespace, $row->pb_title );

            $processedTitles .= "* [[$titleA]]\n";

            $job = new DoubleRedirectJob( $titleA, [
                'reason' => 'maintenance',
                'redirTitle' => $titleB->getPrefixedDBkey()
            ] );

            if ( !$async ) {
                $success = ( $dryrun ? true : $job->run() );
                if ( !$success ) {
                    $this->error( "Error fixing " . $titleA->getPrefixedText()
                        . ": " . $job->getLastError() . "\n" );
                }
            } else {
                $jobs[] = $job;
                // @todo FIXME: Hardcoded constant 10000 copied from DoubleRedirectJob class
                if ( count( $jobs ) > 10000 ) {
                    $this->queueJobs( $jobs, $dryrun );
                    $jobs = [];
                }
            }

            if ( ++$n % 100 == 0 ) {
                $this->output( "$n...\n" );
            }
        }

        if ( count( $jobs ) ) {
            $this->queueJobs( $jobs, $dryrun );
        }
        $this->output( "$n double redirects processed" . $processedTitles . "\n" );
    }

    protected function queueJobs( $jobs, $dryrun = false ) {
        $this->output( "Queuing batch of " . count( $jobs ) . " double redirects.\n" );
        JobQueueGroup::singleton()->push( $dryrun ? [] : $jobs );
    }
}

$maintClass = FixDoubleRedirects::class;
require_once RUN_MAINTENANCE_IF_MAIN;