maintenance/deleteOrphanedRevisions.php

   1 <?php
   2 /**
   3  * Delete revisions which refer to a nonexisting page.
   4  * Sometimes manual deletion done in a rush leaves crap in the database.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  * @ingroup Maintenance
  23  * @author Rob Church <robchur@gmail.com>
  24  * @todo More efficient cleanup of text records
  25  */
  26
  27 require_once __DIR__ . '/Maintenance.php';
  28
  29 /**
  30  * Maintenance script that deletes revisions which refer to a nonexisting page.
  31  *
  32  * @ingroup Maintenance
  33  */
  34 class DeleteOrphanedRevisions extends Maintenance {
  35         public function __construct() {
  36                 parent::__construct();
  37                 $this->mDescription = "Maintenance script to delete revisions which refer to a nonexisting page";
  38                 $this->addOption( 'report', 'Prints out a count of affected revisions but doesn\'t delete them' );
  39         }
  40
  41         public function execute() {
  42                 $this->output( "Delete Orphaned Revisions\n" );
  43
  44                 $report = $this->hasOption( 'report' );
  45
  46                 $dbw = $this->getDB( DB_MASTER );
  47                 $this->beginTransaction( $dbw, __METHOD__ );
  48                 list( $page, $revision ) = $dbw->tableNamesN( 'page', 'revision' );
  49
  50                 # Find all the orphaned revisions
  51                 $this->output( "Checking for orphaned revisions..." );
  52                 $sql = "SELECT rev_id FROM {$revision} LEFT JOIN {$page} ON rev_page = page_id "
  53                         . "WHERE page_namespace IS NULL";
  54                 $res = $dbw->query( $sql, 'deleteOrphanedRevisions' );
  55
  56                 # Stash 'em all up for deletion (if needed)
  57                 $revisions = array();
  58                 foreach ( $res as $row ) {
  59                         $revisions[] = $row->rev_id;
  60                 }
  61                 $count = count( $revisions );
  62                 $this->output( "found {$count}.\n" );
  63
  64                 # Nothing to do?
  65                 if ( $report || $count == 0 ) {
  66                         $this->commitTransaction( $dbw, __METHOD__ );
  67                         exit( 0 );
  68                 }
  69
  70                 # Delete each revision
  71                 $this->output( "Deleting..." );
  72                 $this->deleteRevs( $revisions, $dbw );
  73                 $this->output( "done.\n" );
  74
  75                 # Close the transaction and call the script to purge unused text records
  76                 $this->commitTransaction( $dbw, __METHOD__ );
  77                 $this->purgeRedundantText( true );
  78         }
  79
  80         /**
  81          * Delete one or more revisions from the database
  82          * Do this inside a transaction
  83          *
  84          * @param array $id Array of revision id values
  85          * @param DatabaseBase $dbw DatabaseBase class (needs to be a master)
  86          */
  87         private function deleteRevs( $id, &$dbw ) {
  88                 if ( !is_array( $id ) ) {
  89                         $id = array( $id );
  90                 }
  91                 $dbw->delete( 'revision', array( 'rev_id' => $id ), __METHOD__ );
  92         }
  93 }
  94
  95 $maintClass = "DeleteOrphanedRevisions";
  96 require_once RUN_MAINTENANCE_IF_MAIN;