129 lines
4.2 KiB
PHP
129 lines
4.2 KiB
PHP
<?php
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/**
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* Fixes timestamp corruption caused by one or more webservers temporarily
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* being set to the wrong time.
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* The time offset must be known and consistent. Start and end times
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* (in 14-character format) restrict the search, and must bracket the damage.
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* There must be a majority of good timestamps in the search period.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Maintenance
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*/
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require_once __DIR__ . '/Maintenance.php';
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/**
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* Maintenance script that fixes timestamp corruption caused by one or
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* more webservers temporarily being set to the wrong time.
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*
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* @ingroup Maintenance
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*/
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class FixTimestamps extends Maintenance {
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public function __construct() {
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parent::__construct();
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$this->addDescription( '' );
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$this->addArg( 'offset', '' );
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$this->addArg( 'start', 'Starting timestamp' );
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$this->addArg( 'end', 'Ending timestamp' );
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}
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public function execute() {
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$offset = $this->getArg( 0 ) * 3600;
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$start = $this->getArg( 1 );
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$end = $this->getArg( 2 );
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// maximum normal clock offset
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$grace = 60;
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# Find bounding revision IDs
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$dbw = $this->getDB( DB_PRIMARY );
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$revisionTable = $dbw->tableName( 'revision' );
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$res = $dbw->query( "SELECT MIN(rev_id) as minrev, MAX(rev_id) as maxrev FROM $revisionTable " .
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"WHERE rev_timestamp BETWEEN '{$start}' AND '{$end}'", __METHOD__ );
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$row = $dbw->fetchObject( $res );
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if ( $row->minrev === null ) {
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$this->fatalError( "No revisions in search period." );
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}
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$minRev = $row->minrev;
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$maxRev = $row->maxrev;
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# Select all timestamps and IDs
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$sql = "SELECT rev_id, rev_timestamp FROM $revisionTable " .
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"WHERE rev_id BETWEEN $minRev AND $maxRev";
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if ( $offset > 0 ) {
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$sql .= " ORDER BY rev_id DESC";
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$expectedSign = -1;
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} else {
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$expectedSign = 1;
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}
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$res = $dbw->query( $sql, __METHOD__ );
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$lastNormal = 0;
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$badRevs = [];
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$numGoodRevs = 0;
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foreach ( $res as $row ) {
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$timestamp = wfTimestamp( TS_UNIX, $row->rev_timestamp );
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$delta = $timestamp - $lastNormal;
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$sign = $delta == 0 ? 0 : $delta / abs( $delta );
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if ( $sign == 0 || $sign == $expectedSign ) {
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// Monotonic change
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$lastNormal = $timestamp;
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++$numGoodRevs;
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} elseif ( abs( $delta ) <= $grace ) {
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// Non-monotonic change within grace interval
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++$numGoodRevs;
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} else {
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// Non-monotonic change larger than grace interval
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$badRevs[] = $row->rev_id;
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}
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}
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$numBadRevs = count( $badRevs );
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if ( $numBadRevs > $numGoodRevs ) {
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$this->fatalError(
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"The majority of revisions in the search interval are marked as bad.
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Are you sure the offset ($offset) has the right sign? Positive means the clock
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was incorrectly set forward, negative means the clock was incorrectly set back.
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If the offset is right, then increase the search interval until there are enough
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good revisions to provide a majority reference." );
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} elseif ( $numBadRevs == 0 ) {
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$this->output( "No bad revisions found.\n" );
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return;
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}
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$this->output( sprintf( "Fixing %d revisions (%.2f%% of revisions in search interval)\n",
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$numBadRevs, $numBadRevs / ( $numGoodRevs + $numBadRevs ) * 100 ) );
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$fixup = -$offset;
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$sql = "UPDATE $revisionTable " .
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"SET rev_timestamp="
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. "DATE_FORMAT(DATE_ADD(rev_timestamp, INTERVAL $fixup SECOND), '%Y%m%d%H%i%s') " .
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"WHERE rev_id IN (" . $dbw->makeList( $badRevs ) . ')';
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$dbw->query( $sql, __METHOD__ );
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$this->output( "Done\n" );
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}
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}
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$maintClass = FixTimestamps::class;
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require_once RUN_MAINTENANCE_IF_MAIN;
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