summaryrefslogtreecommitdiff
path: root/maintenance/orphans.php
blob: b4d255ab8abacbe0bb99315f82d2a2e561a21239 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
<?php
/**
 * Look for 'orphan' revisions hooked to pages which don't exist and
 * 'childless' pages with no revisions.
 * Then, kill the poor widows and orphans.
 * Man this is depressing.
 *
 * Copyright © 2005 Brion Vibber <brion@pobox.com>
 * http://www.mediawiki.org/
 *
 * 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
 * @author <brion@pobox.com>
 * @ingroup Maintenance
 */

require_once __DIR__ . '/Maintenance.php';

/**
 * Maintenance script that looks for 'orphan' revisions hooked to pages which
 * don't exist and 'childless' pages with no revisions.
 *
 * @ingroup Maintenance
 */
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' ) );
	}

	/**
	 * Lock the appropriate tables for the script
	 * @param $db DatabaseBase object
	 * @param $extraTable String The name of any extra tables to lock (eg: text)
	 */
	private function lockTables( $db, $extraTable = array() ) {
		$tbls = array( 'page', 'revision', 'redirect' );
		if ( $extraTable ) {
			$tbls = array_merge( $tbls, $extraTable );
		}
		$db->lockTables( array(), $tbls, __METHOD__, false );
	}

	/**
	 * Check for orphan revisions
	 * @param $fix bool Whether to fix broken revisions when found
	 */
	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 = $result->numRows();
		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__ );
		}
	}

	/**
	 * @param $fix bool
	 * @todo DON'T USE THIS YET! It will remove entries which have children,
	 *       but which aren't properly attached (eg if page_latest is bogus
	 *       but valid revisions do exist)
	 */
	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 = $result->numRows();
		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__ );
		}
	}

	/**
	 * Check for pages where page_latest is wrong
	 * @param $fix bool Whether to fix broken entries
	 */
	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;