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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | * @ingroup Maintenance |
| 20 | */ |
| 21 | |
| 22 | require_once __DIR__ . '/Maintenance.php'; |
| 23 | |
| 24 | use MediaWiki\Title\Title; |
| 25 | |
| 26 | /** |
| 27 | * Maintenance script that clears rows of pages corrupted by MergeHistory, those |
| 28 | * pages 'exist' but have no visible revision. |
| 29 | * |
| 30 | * These pages are completely inaccessible via the UI due to revision/title mismatch |
| 31 | * exceptions in RevisionStore and elsewhere. |
| 32 | * |
| 33 | * These are rows in page_table that have 'page_latest' entry with corresponding |
| 34 | * 'rev_id' but no associated 'rev_page' entry in revision table. Such rows create |
| 35 | * ghost pages because their 'page_latest' is actually living on different pages |
| 36 | * (which possess the associated 'rev_page' on revision table now). |
| 37 | * |
| 38 | * @see https://phabricator.wikimedia.org/T263340 |
| 39 | * @see https://phabricator.wikimedia.org/T259022 |
| 40 | */ |
| 41 | class FixMergeHistoryCorruption extends Maintenance { |
| 42 | |
| 43 | public function __construct() { |
| 44 | parent::__construct(); |
| 45 | $this->addDescription( 'Delete pages corrupted by MergeHistory' ); |
| 46 | $this->addOption( 'ns', 'Namespace to restrict the query', false, true ); |
| 47 | $this->addOption( 'dry-run', 'Run in dry-mode' ); |
| 48 | $this->addOption( 'delete', 'Actually delete the found rows' ); |
| 49 | } |
| 50 | |
| 51 | public function execute() { |
| 52 | $dbr = $this->getReplicaDB(); |
| 53 | $dbw = $this->getPrimaryDB(); |
| 54 | |
| 55 | $dryRun = true; |
| 56 | if ( $this->hasOption( 'dry-run' ) && $this->hasOption( 'delete' ) ) { |
| 57 | $this->fatalError( 'Cannot do both --dry-run and --delete.' ); |
| 58 | } elseif ( $this->hasOption( 'delete' ) ) { |
| 59 | $dryRun = false; |
| 60 | } elseif ( !$this->hasOption( 'dry-run' ) ) { |
| 61 | $this->fatalError( 'Either --dry-run or --delete must be specified.' ); |
| 62 | } |
| 63 | |
| 64 | $conds = [ 'page_id<>rev_page' ]; |
| 65 | if ( $this->hasOption( 'ns' ) ) { |
| 66 | $conds['page_namespace'] = (int)$this->getOption( 'ns' ); |
| 67 | } |
| 68 | |
| 69 | $res = $dbr->newSelectQueryBuilder() |
| 70 | ->from( 'page' ) |
| 71 | ->join( 'revision', null, 'page_latest=rev_id' ) |
| 72 | ->fields( [ 'page_namespace', 'page_title', 'page_id' ] ) |
| 73 | ->where( $conds ) |
| 74 | ->caller( __METHOD__ ) |
| 75 | ->fetchResultSet(); |
| 76 | |
| 77 | $count = $res->numRows(); |
| 78 | |
| 79 | if ( !$count ) { |
| 80 | $this->output( "Nothing was found, no page matches the criteria.\n" ); |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | $numDeleted = 0; |
| 85 | $numUpdated = 0; |
| 86 | |
| 87 | foreach ( $res as $row ) { |
| 88 | $title = Title::makeTitleSafe( $row->page_namespace, $row->page_title ); |
| 89 | if ( !$title ) { |
| 90 | $this->output( "Skipping invalid title with page_id: $row->page_id\n" ); |
| 91 | continue; |
| 92 | } |
| 93 | $titleText = $title->getPrefixedDBkey(); |
| 94 | |
| 95 | // Check if there are any revisions that have this $row->page_id as their |
| 96 | // rev_page and select the largest which should be the newest revision. |
| 97 | $revId = $dbr->newSelectQueryBuilder() |
| 98 | ->select( 'MAX(rev_id)' ) |
| 99 | ->from( 'revision' ) |
| 100 | ->where( [ 'rev_page' => $row->page_id ] ) |
| 101 | ->caller( __METHOD__ )->fetchField(); |
| 102 | |
| 103 | if ( !$revId ) { |
| 104 | if ( $dryRun ) { |
| 105 | $this->output( "Would delete $titleText with page_id: $row->page_id\n" ); |
| 106 | } else { |
| 107 | $this->output( "Deleting $titleText with page_id: $row->page_id\n" ); |
| 108 | $dbw->newDeleteQueryBuilder() |
| 109 | ->deleteFrom( 'page' ) |
| 110 | ->where( [ 'page_id' => $row->page_id ] ) |
| 111 | ->caller( __METHOD__ )->execute(); |
| 112 | } |
| 113 | $numDeleted++; |
| 114 | } else { |
| 115 | if ( $dryRun ) { |
| 116 | $this->output( "Would update page_id $row->page_id to page_latest $revId\n" ); |
| 117 | } else { |
| 118 | $this->output( "Updating page_id $row->page_id to page_latest $revId\n" ); |
| 119 | $dbw->newUpdateQueryBuilder() |
| 120 | ->update( 'page' ) |
| 121 | ->set( [ 'page_latest' => $revId ] ) |
| 122 | ->where( [ 'page_id' => $row->page_id ] ) |
| 123 | ->caller( __METHOD__ )->execute(); |
| 124 | } |
| 125 | $numUpdated++; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | if ( !$dryRun ) { |
| 130 | $this->output( "Updated $numUpdated row(s), deleted $numDeleted row(s)\n" ); |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | $maintClass = FixMergeHistoryCorruption::class; |
| 136 | require_once RUN_MAINTENANCE_IF_MAIN; |