update.php

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<?php
if ( !function_exists( 'version_compare' ) || ( version_compare( phpversion(), '5.3.2' ) < 0 ) ) {
    require dirname( __FILE__ ) . '/../includes/PHPVersionError.php';
    wfPHPVersionError( 'cli' );
}

$wgUseMasterForMaintenance = true;
require_once __DIR__ . '/Maintenance.php';

class UpdateMediaWiki extends Maintenance {
    function __construct() {
        parent::__construct();
        $this->mDescription = "MediaWiki database updater";
        $this->addOption( 'skip-compat-checks', 'Skips compatibility checks, mostly for developers' );
        $this->addOption( 'quick', 'Skip 5 second countdown before starting' );
        $this->addOption( 'doshared', 'Also update shared tables' );
        $this->addOption( 'nopurge', 'Do not purge the objectcache table after updates' );
        $this->addOption( 'noschema', 'Only do the updates that are not done during schema updates' );
        $this->addOption( 'schema', 'Output SQL to do the schema updates instead of doing them.  Works even when $wgAllowSchemaUpdates is false', false, true );
        $this->addOption( 'force', 'Override when $wgAllowSchemaUpdates disables this script' );
    }

    function getDbType() {
        /* If we used the class constant PHP4 would give a parser error here */
        return 2 /* Maintenance::DB_ADMIN */;
    }

    function compatChecks() {
        // Avoid syntax error in PHP4
        $minimumPcreVersion = constant( 'Installer::MINIMUM_PCRE_VERSION' );

        list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
        if ( version_compare( $pcreVersion, $minimumPcreVersion, '<' ) ) {
            $this->error(
                "PCRE $minimumPcreVersion or later is required.\n" .
                "Your PHP binary is linked with PCRE $pcreVersion.\n\n" .
                "More information:\n" .
                "https://www.mediawiki.org/wiki/Manual:Errors_and_symptoms/PCRE\n\n" .
                "ABORTING.\n",
                true );
        }

        $test = new PhpXmlBugTester();
        if ( !$test->ok ) {
            $this->error(
                "Your system has a combination of PHP and libxml2 versions which is buggy\n" .
                "and can cause hidden data corruption in MediaWiki and other web apps.\n" .
                "Upgrade to PHP 5.2.9 or later and libxml2 2.7.3 or later!\n" .
                "ABORTING (see http://bugs.php.net/bug.php?id=45996).\n",
                true );
        }

        $test = new PhpRefCallBugTester;
        $test->execute();
        if ( !$test->ok ) {
            $ver = phpversion();
            $this->error(
                "PHP $ver is not compatible with MediaWiki due to a bug involving\n" .
                "reference parameters to __call. Upgrade to PHP 5.3.2 or higher, or \n" .
                "downgrade to PHP 5.3.0 to fix this.\n" .
                "ABORTING (see http://bugs.php.net/bug.php?id=50394 for details)\n",
                true );
        }
    }

    function execute() {
        global $wgVersion, $wgTitle, $wgLang, $wgAllowSchemaUpdates;

        if ( !$wgAllowSchemaUpdates && !( $this->hasOption( 'force' ) || $this->hasOption( 'schema' ) || $this->hasOption( 'noschema' ) ) ) {
            $this->error( "Do not run update.php on this wiki. If you're seeing this you should\n"
                . "probably ask for some help in performing your schema updates or use\n"
                . "the --noschema and --schema options to get an SQL file for someone\n"
                . "else to inspect and run.\n\n"
                . "If you know what you are doing, you can continue with --force\n", true );
        }

        $this->fileHandle = null;
        if ( substr( $this->getOption( 'schema' ), 0, 2 ) === "--" ) {
            $this->error( "The --schema option requires a file as an argument.\n", true );
        } elseif ( $this->hasOption( 'schema' ) ) {
            $file = $this->getOption( 'schema' );
            $this->fileHandle = fopen( $file, "w" );
            if ( $this->fileHandle === false ) {
                $err = error_get_last();
                $this->error( "Problem opening the schema file for writing: $file\n\t{$err['message']}", true );
            }
        }

        $wgLang = Language::factory( 'en' );
        $wgTitle = Title::newFromText( "MediaWiki database updater" );

        $this->output( "MediaWiki {$wgVersion} Updater\n\n" );

        wfWaitForSlaves( 5 ); // let's not kill databases, shall we? ;) --tor

        if ( !$this->hasOption( 'skip-compat-checks' ) ) {
            $this->compatChecks();
        } else {
            $this->output( "Skipping compatibility checks, proceed at your own risk (Ctrl+C to abort)\n" );
            wfCountdown( 5 );
        }

        # Attempt to connect to the database as a privileged user
        # This will vomit up an error if there are permissions problems
        $db = wfGetDB( DB_MASTER );

        $this->output( "Going to run database updates for " . wfWikiID() . "\n" );
        if ( $db->getType() === 'sqlite' ) {
            $this->output( "Using SQLite file: '{$db->mDatabaseFile}'\n" );
        }
        $this->output( "Depending on the size of your database this may take a while!\n" );

        if ( !$this->hasOption( 'quick' ) ) {
            $this->output( "Abort with control-c in the next five seconds (skip this countdown with --quick) ... " );
            wfCountDown( 5 );
        }

        $shared = $this->hasOption( 'doshared' );

        $updates = array( 'core', 'extensions' );
        if ( !$this->hasOption( 'schema' ) ) {
            if ( $this->hasOption( 'noschema' ) ) {
                $updates[] = 'noschema';
            }
            $updates[] = 'stats';
        }

        $updater = DatabaseUpdater::newForDb( $db, $shared, $this );
        $updater->doUpdates( $updates );

        foreach ( $updater->getPostDatabaseUpdateMaintenance() as $maint ) {
            $child = $this->runChild( $maint );

            // LoggedUpdateMaintenance is checking the updatelog itself
            $isLoggedUpdate = is_a( $child, 'LoggedUpdateMaintenance' );

            if ( !$isLoggedUpdate && $updater->updateRowExists( $maint ) ) {
                continue;
            }

            $child->execute();
            if ( !$isLoggedUpdate ) {
                $updater->insertUpdateRow( $maint );
            }
        }

        if ( !$this->hasOption( 'nopurge' ) ) {
            $updater->purgeCache();
        }

        $this->output( "\nDone.\n" );
    }

    function afterFinalSetup() {
        global $wgLocalisationCacheConf;

        # Don't try to access the database
        # This needs to be disabled early since extensions will try to use the l10n
        # cache from $wgExtensionFunctions (bug 20471)
        $wgLocalisationCacheConf = array(
            'class' => 'LocalisationCache',
            'storeClass' => 'LCStore_Null',
            'storeDirectory' => false,
            'manualRecache' => false,
        );
    }
}

$maintClass = 'UpdateMediaWiki';
require_once RUN_MAINTENANCE_IF_MAIN;