orphans.php

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<?php
require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class Orphans extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Look for 'orphan' revisions hooked to pages which don't exist\n" .
                                                                "And 'childless' pages with no revisions\n" .
                                                                "Then, kill the poor widows and orphans\n" .
                                                                "Man this is depressing";
                $this->addOption( 'fix', 'Actually fix broken entries' );
        }

        public function execute() {
                global $wgTitle;
                $wgTitle = Title::newFromText( 'Orphan revision cleanup script' );
                $this->checkOrphans( $this->hasOption( 'fix' ) );
                $this->checkSeparation( $this->hasOption( 'fix' ) );
                # Does not work yet, do not use
                # $this->checkWidows( $this->hasOption( 'fix' ) );
        }

        private function lockTables( $db, $extraTable = array() ) {
                $tbls = array( 'page', 'revision', 'redirect' );
                if ( $extraTable ) {
                        $tbls = array_merge( $tbls, $extraTable );
                }
                $db->lockTables( array(), $tbls, __METHOD__, false );
        }

        private function checkOrphans( $fix ) {
                $dbw = wfGetDB( DB_MASTER );
                $page = $dbw->tableName( 'page' );
                $revision = $dbw->tableName( 'revision' );

                if ( $fix ) {
                        $this->lockTables( $dbw );
                }

                $this->output( "Checking for orphan revision table entries... (this may take a while on a large wiki)\n" );
                $result = $dbw->query( "
                        SELECT *
                        FROM $revision LEFT OUTER JOIN $page ON rev_page=page_id
                        WHERE page_id IS NULL
                " );
                $orphans = $dbw->numRows( $result );
                if ( $orphans > 0 ) {
                        global $wgContLang;
                        $this->output( "$orphans orphan revisions...\n" );
                        $this->output( sprintf( "%10s %10s %14s %20s %s\n", 'rev_id', 'rev_page', 'rev_timestamp', 'rev_user_text', 'rev_comment' ) );
                        foreach ( $result as $row ) {
                                $comment = ( $row->rev_comment == '' )
                                        ? ''
                                        : '(' . $wgContLang->truncate( $row->rev_comment, 40 ) . ')';
                                $this->output( sprintf( "%10d %10d %14s %20s %s\n",
                                        $row->rev_id,
                                        $row->rev_page,
                                        $row->rev_timestamp,
                                        $wgContLang->truncate( $row->rev_user_text, 17 ),
                                        $comment ) );
                                if ( $fix ) {
                                        $dbw->delete( 'revision', array( 'rev_id' => $row->rev_id ) );
                                }
                        }
                        if ( !$fix ) {
                                $this->output( "Run again with --fix to remove these entries automatically.\n" );
                        }
                } else {
                        $this->output( "No orphans! Yay!\n" );
                }

                if ( $fix ) {
                        $dbw->unlockTables( __METHOD__ );
                }
        }

        private function checkWidows( $fix ) {
                $dbw = wfGetDB( DB_MASTER );
                $page = $dbw->tableName( 'page' );
                $revision = $dbw->tableName( 'revision' );

                if ( $fix ) {
                        $this->lockTables( $dbw );
                }

                $this->output( "\nChecking for childless page table entries... (this may take a while on a large wiki)\n" );
                $result = $dbw->query( "
                        SELECT *
                        FROM $page LEFT OUTER JOIN $revision ON page_latest=rev_id
                        WHERE rev_id IS NULL
                " );
                $widows = $dbw->numRows( $result );
                if ( $widows > 0 ) {
                        $this->output( "$widows childless pages...\n" );
                        $this->output( sprintf( "%10s %11s %2s %s\n", 'page_id', 'page_latest', 'ns', 'page_title' ) );
                        foreach ( $result as $row ) {
                                printf( "%10d %11d %2d %s\n",
                                        $row->page_id,
                                        $row->page_latest,
                                        $row->page_namespace,
                                        $row->page_title );
                                if ( $fix ) {
                                        $dbw->delete( 'page', array( 'page_id' => $row->page_id ) );
                                }
                        }
                        if ( !$fix ) {
                                $this->output( "Run again with --fix to remove these entries automatically.\n" );
                        }
                } else {
                        $this->output( "No childless pages! Yay!\n" );
                }

                if ( $fix ) {
                        $dbw->unlockTables( __METHOD__ );
                }
        }

        private function checkSeparation( $fix ) {
                $dbw = wfGetDB( DB_MASTER );
                $page     = $dbw->tableName( 'page' );
                $revision = $dbw->tableName( 'revision' );

                if ( $fix ) {
                        $this->lockTables( $dbw, array( 'user', 'text' ) );
                }

                $this->output( "\nChecking for pages whose page_latest links are incorrect... (this may take a while on a large wiki)\n" );
                $result = $dbw->query( "
                        SELECT *
                        FROM $page LEFT OUTER JOIN $revision ON page_latest=rev_id
                " );
                $found = 0;
                foreach ( $result as $row ) {
                        $result2 = $dbw->query( "
                                SELECT MAX(rev_timestamp) as max_timestamp
                                FROM $revision
                                WHERE rev_page=$row->page_id
                        " );
                        $row2 = $dbw->fetchObject( $result2 );
                        if ( $row2 ) {
                                if ( $row->rev_timestamp != $row2->max_timestamp ) {
                                        if ( $found == 0 ) {
                                                $this->output( sprintf( "%10s %10s %14s %14s\n",
                                                        'page_id', 'rev_id', 'timestamp', 'max timestamp' ) );
                                        }
                                        ++$found;
                                        $this->output( sprintf( "%10d %10d %14s %14s\n",
                                                $row->page_id,
                                                $row->page_latest,
                                                $row->rev_timestamp,
                                                $row2->max_timestamp ) );
                                        if ( $fix ) {
                                                # ...
                                                $maxId = $dbw->selectField(
                                                        'revision',
                                                        'rev_id',
                                                        array(
                                                                'rev_page'      => $row->page_id,
                                                                'rev_timestamp' => $row2->max_timestamp ) );
                                                $this->output( "... updating to revision $maxId\n" );
                                                $maxRev = Revision::newFromId( $maxId );
                                                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                                                $article = WikiPage::factory( $title );
                                                $article->updateRevisionOn( $dbw, $maxRev );
                                        }
                                }
                        } else {
                                $this->output( "wtf\n" );
                        }
                }

                if ( $found ) {
                        $this->output( "Found $found pages with incorrect latest revision.\n" );
                } else {
                        $this->output( "No pages with incorrect latest revision. Yay!\n" );
                }
                if ( !$fix && $found > 0 ) {
                        $this->output( "Run again with --fix to remove these entries automatically.\n" );
                }

                if ( $fix ) {
                        $dbw->unlockTables( __METHOD__ );
                }
        }
}

$maintClass = "Orphans";
require_once( RUN_MAINTENANCE_IF_MAIN );