includes/installer/Installer.php

   1 <?php
   2 /**
   3  * Base code for MediaWiki installer.
   4  *
   5  * DO NOT PATCH THIS FILE IF YOU NEED TO CHANGE INSTALLER BEHAVIOR IN YOUR PACKAGE!
   6  * See mw-config/overrides/README for details.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Deployment
  25  */
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * This documentation group collects source code files with deployment functionality.
  30  *
  31  * @defgroup Deployment Deployment
  32  */
  33
  34 /**
  35  * Base installer class.
  36  *
  37  * This class provides the base for installation and update functionality
  38  * for both MediaWiki core and extensions.
  39  *
  40  * @ingroup Deployment
  41  * @since 1.17
  42  */
  43 abstract class Installer {
  44
  45         /**
  46          * The oldest version of PCRE we can support.
  47          *
  48          * Defining this is necessary because PHP may be linked with a system version
  49          * of PCRE, which may be older than that bundled with the minimum PHP version.
  50          */
  51         const MINIMUM_PCRE_VERSION = '7.2';
  52
  53         /**
  54          * @var array
  55          */
  56         protected $settings;
  57
  58         /**
  59          * List of detected DBs, access using getCompiledDBs().
  60          *
  61          * @var array
  62          */
  63         protected $compiledDBs;
  64
  65         /**
  66          * Cached DB installer instances, access using getDBInstaller().
  67          *
  68          * @var array
  69          */
  70         protected $dbInstallers = [];
  71
  72         /**
  73          * Minimum memory size in MB.
  74          *
  75          * @var int
  76          */
  77         protected $minMemorySize = 50;
  78
  79         /**
  80          * Cached Title, used by parse().
  81          *
  82          * @var Title
  83          */
  84         protected $parserTitle;
  85
  86         /**
  87          * Cached ParserOptions, used by parse().
  88          *
  89          * @var ParserOptions
  90          */
  91         protected $parserOptions;
  92
  93         /**
  94          * Known database types. These correspond to the class names <type>Installer,
  95          * and are also MediaWiki database types valid for $wgDBtype.
  96          *
  97          * To add a new type, create a <type>Installer class and a Database<type>
  98          * class, and add a config-type-<type> message to MessagesEn.php.
  99          *
 100          * @var array
 101          */
 102         protected static $dbTypes = [
 103                 'mysql',
 104                 'postgres',
 105                 'oracle',
 106                 'mssql',
 107                 'sqlite',
 108         ];
 109
 110         /**
 111          * A list of environment check methods called by doEnvironmentChecks().
 112          * These may output warnings using showMessage(), and/or abort the
 113          * installation process by returning false.
 114          *
 115          * For the WebInstaller these are only called on the Welcome page,
 116          * if these methods have side-effects that should affect later page loads
 117          * (as well as the generated stylesheet), use envPreps instead.
 118          *
 119          * @var array
 120          */
 121         protected $envChecks = [
 122                 'envCheckDB',
 123                 'envCheckBrokenXML',
 124                 'envCheckPCRE',
 125                 'envCheckMemory',
 126                 'envCheckCache',
 127                 'envCheckModSecurity',
 128                 'envCheckDiff3',
 129                 'envCheckGraphics',
 130                 'envCheckGit',
 131                 'envCheckServer',
 132                 'envCheckPath',
 133                 'envCheckShellLocale',
 134                 'envCheckUploadsDirectory',
 135                 'envCheckLibicu',
 136                 'envCheckSuhosinMaxValueLength',
 137         ];
 138
 139         /**
 140          * A list of environment preparation methods called by doEnvironmentPreps().
 141          *
 142          * @var array
 143          */
 144         protected $envPreps = [
 145                 'envPrepServer',
 146                 'envPrepPath',
 147         ];
 148
 149         /**
 150          * MediaWiki configuration globals that will eventually be passed through
 151          * to LocalSettings.php. The names only are given here, the defaults
 152          * typically come from DefaultSettings.php.
 153          *
 154          * @var array
 155          */
 156         protected $defaultVarNames = [
 157                 'wgSitename',
 158                 'wgPasswordSender',
 159                 'wgLanguageCode',
 160                 'wgRightsIcon',
 161                 'wgRightsText',
 162                 'wgRightsUrl',
 163                 'wgEnableEmail',
 164                 'wgEnableUserEmail',
 165                 'wgEnotifUserTalk',
 166                 'wgEnotifWatchlist',
 167                 'wgEmailAuthentication',
 168                 'wgDBname',
 169                 'wgDBtype',
 170                 'wgDiff3',
 171                 'wgImageMagickConvertCommand',
 172                 'wgGitBin',
 173                 'IP',
 174                 'wgScriptPath',
 175                 'wgMetaNamespace',
 176                 'wgDeletedDirectory',
 177                 'wgEnableUploads',
 178                 'wgShellLocale',
 179                 'wgSecretKey',
 180                 'wgUseInstantCommons',
 181                 'wgUpgradeKey',
 182                 'wgDefaultSkin',
 183                 'wgPingback',
 184         ];
 185
 186         /**
 187          * Variables that are stored alongside globals, and are used for any
 188          * configuration of the installation process aside from the MediaWiki
 189          * configuration. Map of names to defaults.
 190          *
 191          * @var array
 192          */
 193         protected $internalDefaults = [
 194                 '_UserLang' => 'en',
 195                 '_Environment' => false,
 196                 '_RaiseMemory' => false,
 197                 '_UpgradeDone' => false,
 198                 '_InstallDone' => false,
 199                 '_Caches' => [],
 200                 '_InstallPassword' => '',
 201                 '_SameAccount' => true,
 202                 '_CreateDBAccount' => false,
 203                 '_NamespaceType' => 'site-name',
 204                 '_AdminName' => '', // will be set later, when the user selects language
 205                 '_AdminPassword' => '',
 206                 '_AdminPasswordConfirm' => '',
 207                 '_AdminEmail' => '',
 208                 '_Subscribe' => false,
 209                 '_SkipOptional' => 'continue',
 210                 '_RightsProfile' => 'wiki',
 211                 '_LicenseCode' => 'none',
 212                 '_CCDone' => false,
 213                 '_Extensions' => [],
 214                 '_Skins' => [],
 215                 '_MemCachedServers' => '',
 216                 '_UpgradeKeySupplied' => false,
 217                 '_ExistingDBSettings' => false,
 218
 219                 // $wgLogo is probably wrong (bug 48084); set something that will work.
 220                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 221                 'wgLogo' => '$wgResourceBasePath/resources/assets/wiki.png',
 222                 'wgAuthenticationTokenVersion' => 1,
 223         ];
 224
 225         /**
 226          * The actual list of installation steps. This will be initialized by getInstallSteps()
 227          *
 228          * @var array
 229          */
 230         private $installSteps = [];
 231
 232         /**
 233          * Extra steps for installation, for things like DatabaseInstallers to modify
 234          *
 235          * @var array
 236          */
 237         protected $extraInstallSteps = [];
 238
 239         /**
 240          * Known object cache types and the functions used to test for their existence.
 241          *
 242          * @var array
 243          */
 244         protected $objectCaches = [
 245                 'xcache' => 'xcache_get',
 246                 'apc' => 'apc_fetch',
 247                 'wincache' => 'wincache_ucache_get'
 248         ];
 249
 250         /**
 251          * User rights profiles.
 252          *
 253          * @var array
 254          */
 255         public $rightsProfiles = [
 256                 'wiki' => [],
 257                 'no-anon' => [
 258                         '*' => [ 'edit' => false ]
 259                 ],
 260                 'fishbowl' => [
 261                         '*' => [
 262                                 'createaccount' => false,
 263                                 'edit' => false,
 264                         ],
 265                 ],
 266                 'private' => [
 267                         '*' => [
 268                                 'createaccount' => false,
 269                                 'edit' => false,
 270                                 'read' => false,
 271                         ],
 272                 ],
 273         ];
 274
 275         /**
 276          * License types.
 277          *
 278          * @var array
 279          */
 280         public $licenses = [
 281                 'cc-by' => [
 282                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 283                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 284                 ],
 285                 'cc-by-sa' => [
 286                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 287                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 288                 ],
 289                 'cc-by-nc-sa' => [
 290                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 291                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 292                 ],
 293                 'cc-0' => [
 294                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 295                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 296                 ],
 297                 'pd' => [
 298                         'url' => '',
 299                         'icon' => '$wgResourceBasePath/resources/assets/licenses/public-domain.png',
 300                 ],
 301                 'gfdl' => [
 302                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 303                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 304                 ],
 305                 'none' => [
 306                         'url' => '',
 307                         'icon' => '',
 308                         'text' => ''
 309                 ],
 310                 'cc-choose' => [
 311                         // Details will be filled in by the selector.
 312                         'url' => '',
 313                         'icon' => '',
 314                         'text' => '',
 315                 ],
 316         ];
 317
 318         /**
 319          * URL to mediawiki-announce subscription
 320          */
 321         protected $mediaWikiAnnounceUrl =
 322                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 323
 324         /**
 325          * Supported language codes for Mailman
 326          */
 327         protected $mediaWikiAnnounceLanguages = [
 328                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 329                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 330                 'sl', 'sr', 'sv', 'tr', 'uk'
 331         ];
 332
 333         /**
 334          * UI interface for displaying a short message
 335          * The parameters are like parameters to wfMessage().
 336          * The messages will be in wikitext format, which will be converted to an
 337          * output format such as HTML or text before being sent to the user.
 338          * @param string $msg
 339          */
 340         abstract public function showMessage( $msg /*, ... */ );
 341
 342         /**
 343          * Same as showMessage(), but for displaying errors
 344          * @param string $msg
 345          */
 346         abstract public function showError( $msg /*, ... */ );
 347
 348         /**
 349          * Show a message to the installing user by using a Status object
 350          * @param Status $status
 351          */
 352         abstract public function showStatusMessage( Status $status );
 353
 354         /**
 355          * Constructs a Config object that contains configuration settings that should be
 356          * overwritten for the installation process.
 357          *
 358          * @since 1.27
 359          *
 360          * @param Config $baseConfig
 361          *
 362          * @return Config The config to use during installation.
 363          */
 364         public static function getInstallerConfig( Config $baseConfig ) {
 365                 $configOverrides = new HashConfig();
 366
 367                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 368                 // bug T113843
 369                 $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
 370
 371                 $objectCaches = [
 372                                 CACHE_NONE => $emptyCache,
 373                                 CACHE_DB => $emptyCache,
 374                                 CACHE_ANYTHING => $emptyCache,
 375                                 CACHE_MEMCACHED => $emptyCache,
 376                         ] + $baseConfig->get( 'ObjectCaches' );
 377
 378                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 379
 380                 // Load the installer's i18n.
 381                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 382                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 383
 384                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 385
 386                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 387
 388                 // make sure we use the installer config as the main config
 389                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 390                 $configRegistry['main'] = function() use ( $installerConfig ) {
 391                         return $installerConfig;
 392                 };
 393
 394                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 395
 396                 return $installerConfig;
 397         }
 398
 399         /**
 400          * Constructor, always call this from child classes.
 401          */
 402         public function __construct() {
 403                 global $wgMemc, $wgUser, $wgObjectCaches;
 404
 405                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 406                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 407
 408                 // Reset all services and inject config overrides
 409                 MediaWiki\MediaWikiServices::resetGlobalInstance( $installerConfig );
 410
 411                 // Don't attempt to load user language options (T126177)
 412                 // This will be overridden in the web installer with the user-specified language
 413                 RequestContext::getMain()->setLanguage( 'en' );
 414
 415                 // Disable the i18n cache
 416                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 417                 Language::getLocalisationCache()->disableBackend();
 418
 419                 // Disable all global services, since we don't have any configuration yet!
 420                 MediaWiki\MediaWikiServices::disableStorageBackend();
 421
 422                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 423                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 424                 $wgObjectCaches = MediaWikiServices::getInstance()->getMainConfig()->get( 'ObjectCaches' );
 425                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 426
 427                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 428                 $wgUser = User::newFromId( 0 );
 429                 RequestContext::getMain()->setUser( $wgUser );
 430
 431                 $this->settings = $this->internalDefaults;
 432
 433                 foreach ( $this->defaultVarNames as $var ) {
 434                         $this->settings[$var] = $GLOBALS[$var];
 435                 }
 436
 437                 $this->doEnvironmentPreps();
 438
 439                 $this->compiledDBs = [];
 440                 foreach ( self::getDBTypes() as $type ) {
 441                         $installer = $this->getDBInstaller( $type );
 442
 443                         if ( !$installer->isCompiled() ) {
 444                                 continue;
 445                         }
 446                         $this->compiledDBs[] = $type;
 447                 }
 448
 449                 $this->parserTitle = Title::newFromText( 'Installer' );
 450                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 451                 $this->parserOptions->setEditSection( false );
 452         }
 453
 454         /**
 455          * Get a list of known DB types.
 456          *
 457          * @return array
 458          */
 459         public static function getDBTypes() {
 460                 return self::$dbTypes;
 461         }
 462
 463         /**
 464          * Do initial checks of the PHP environment. Set variables according to
 465          * the observed environment.
 466          *
 467          * It's possible that this may be called under the CLI SAPI, not the SAPI
 468          * that the wiki will primarily run under. In that case, the subclass should
 469          * initialise variables such as wgScriptPath, before calling this function.
 470          *
 471          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 472          * and that sessions are working.
 473          *
 474          * @return Status
 475          */
 476         public function doEnvironmentChecks() {
 477                 // Php version has already been checked by entry scripts
 478                 // Show message here for information purposes
 479                 if ( wfIsHHVM() ) {
 480                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 481                 } else {
 482                         $this->showMessage( 'config-env-php', PHP_VERSION );
 483                 }
 484
 485                 $good = true;
 486                 // Must go here because an old version of PCRE can prevent other checks from completing
 487                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 488                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 489                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 490                         $good = false;
 491                 } else {
 492                         foreach ( $this->envChecks as $check ) {
 493                                 $status = $this->$check();
 494                                 if ( $status === false ) {
 495                                         $good = false;
 496                                 }
 497                         }
 498                 }
 499
 500                 $this->setVar( '_Environment', $good );
 501
 502                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 503         }
 504
 505         public function doEnvironmentPreps() {
 506                 foreach ( $this->envPreps as $prep ) {
 507                         $this->$prep();
 508                 }
 509         }
 510
 511         /**
 512          * Set a MW configuration variable, or internal installer configuration variable.
 513          *
 514          * @param string $name
 515          * @param mixed $value
 516          */
 517         public function setVar( $name, $value ) {
 518                 $this->settings[$name] = $value;
 519         }
 520
 521         /**
 522          * Get an MW configuration variable, or internal installer configuration variable.
 523          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 524          * Installer variables are typically prefixed by an underscore.
 525          *
 526          * @param string $name
 527          * @param mixed $default
 528          *
 529          * @return mixed
 530          */
 531         public function getVar( $name, $default = null ) {
 532                 if ( !isset( $this->settings[$name] ) ) {
 533                         return $default;
 534                 } else {
 535                         return $this->settings[$name];
 536                 }
 537         }
 538
 539         /**
 540          * Get a list of DBs supported by current PHP setup
 541          *
 542          * @return array
 543          */
 544         public function getCompiledDBs() {
 545                 return $this->compiledDBs;
 546         }
 547
 548         /**
 549          * Get an instance of DatabaseInstaller for the specified DB type.
 550          *
 551          * @param mixed $type DB installer for which is needed, false to use default.
 552          *
 553          * @return DatabaseInstaller
 554          */
 555         public function getDBInstaller( $type = false ) {
 556                 if ( !$type ) {
 557                         $type = $this->getVar( 'wgDBtype' );
 558                 }
 559
 560                 $type = strtolower( $type );
 561
 562                 if ( !isset( $this->dbInstallers[$type] ) ) {
 563                         $class = ucfirst( $type ) . 'Installer';
 564                         $this->dbInstallers[$type] = new $class( $this );
 565                 }
 566
 567                 return $this->dbInstallers[$type];
 568         }
 569
 570         /**
 571          * Determine if LocalSettings.php exists. If it does, return its variables.
 572          *
 573          * @return array
 574          */
 575         public static function getExistingLocalSettings() {
 576                 global $IP;
 577
 578                 // You might be wondering why this is here. Well if you don't do this
 579                 // then some poorly-formed extensions try to call their own classes
 580                 // after immediately registering them. We really need to get extension
 581                 // registration out of the global scope and into a real format.
 582                 // @see https://phabricator.wikimedia.org/T69440
 583                 global $wgAutoloadClasses;
 584                 $wgAutoloadClasses = [];
 585
 586                 // @codingStandardsIgnoreStart
 587                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 588                 // Define the required globals here, to ensure, the functions can do it work correctly.
 589                 global $wgExtensionDirectory, $wgStyleDirectory;
 590                 // @codingStandardsIgnoreEnd
 591
 592                 MediaWiki\suppressWarnings();
 593                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 594                 MediaWiki\restoreWarnings();
 595
 596                 if ( !$_lsExists ) {
 597                         return false;
 598                 }
 599                 unset( $_lsExists );
 600
 601                 require "$IP/includes/DefaultSettings.php";
 602                 require "$IP/LocalSettings.php";
 603
 604                 return get_defined_vars();
 605         }
 606
 607         /**
 608          * Get a fake password for sending back to the user in HTML.
 609          * This is a security mechanism to avoid compromise of the password in the
 610          * event of session ID compromise.
 611          *
 612          * @param string $realPassword
 613          *
 614          * @return string
 615          */
 616         public function getFakePassword( $realPassword ) {
 617                 return str_repeat( '*', strlen( $realPassword ) );
 618         }
 619
 620         /**
 621          * Set a variable which stores a password, except if the new value is a
 622          * fake password in which case leave it as it is.
 623          *
 624          * @param string $name
 625          * @param mixed $value
 626          */
 627         public function setPassword( $name, $value ) {
 628                 if ( !preg_match( '/^\*+$/', $value ) ) {
 629                         $this->setVar( $name, $value );
 630                 }
 631         }
 632
 633         /**
 634          * On POSIX systems return the primary group of the webserver we're running under.
 635          * On other systems just returns null.
 636          *
 637          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 638          * webserver user before he can install.
 639          *
 640          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 641          *
 642          * @return mixed
 643          */
 644         public static function maybeGetWebserverPrimaryGroup() {
 645                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 646                         # I don't know this, this isn't UNIX.
 647                         return null;
 648                 }
 649
 650                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 651                 # not whoever owns the current script.
 652                 $gid = posix_getegid();
 653                 $group = posix_getpwuid( $gid )['name'];
 654
 655                 return $group;
 656         }
 657
 658         /**
 659          * Convert wikitext $text to HTML.
 660          *
 661          * This is potentially error prone since many parser features require a complete
 662          * installed MW database. The solution is to just not use those features when you
 663          * write your messages. This appears to work well enough. Basic formatting and
 664          * external links work just fine.
 665          *
 666          * But in case a translator decides to throw in a "#ifexist" or internal link or
 667          * whatever, this function is guarded to catch the attempted DB access and to present
 668          * some fallback text.
 669          *
 670          * @param string $text
 671          * @param bool $lineStart
 672          * @return string
 673          */
 674         public function parse( $text, $lineStart = false ) {
 675                 global $wgParser;
 676
 677                 try {
 678                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 679                         $html = $out->getText();
 680                 } catch ( DBAccessError $e ) {
 681                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 682
 683                         if ( !empty( $this->debug ) ) {
 684                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 685                         }
 686                 }
 687
 688                 return $html;
 689         }
 690
 691         /**
 692          * @return ParserOptions
 693          */
 694         public function getParserOptions() {
 695                 return $this->parserOptions;
 696         }
 697
 698         public function disableLinkPopups() {
 699                 $this->parserOptions->setExternalLinkTarget( false );
 700         }
 701
 702         public function restoreLinkPopups() {
 703                 global $wgExternalLinkTarget;
 704                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 705         }
 706
 707         /**
 708          * Install step which adds a row to the site_stats table with appropriate
 709          * initial values.
 710          *
 711          * @param DatabaseInstaller $installer
 712          *
 713          * @return Status
 714          */
 715         public function populateSiteStats( DatabaseInstaller $installer ) {
 716                 $status = $installer->getConnection();
 717                 if ( !$status->isOK() ) {
 718                         return $status;
 719                 }
 720                 $status->value->insert(
 721                         'site_stats',
 722                         [
 723                                 'ss_row_id' => 1,
 724                                 'ss_total_edits' => 0,
 725                                 'ss_good_articles' => 0,
 726                                 'ss_total_pages' => 0,
 727                                 'ss_users' => 0,
 728                                 'ss_images' => 0
 729                         ],
 730                         __METHOD__, 'IGNORE'
 731                 );
 732
 733                 return Status::newGood();
 734         }
 735
 736         /**
 737          * Environment check for DB types.
 738          * @return bool
 739          */
 740         protected function envCheckDB() {
 741                 global $wgLang;
 742
 743                 $allNames = [];
 744
 745                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 746                 // config-type-sqlite
 747                 foreach ( self::getDBTypes() as $name ) {
 748                         $allNames[] = wfMessage( "config-type-$name" )->text();
 749                 }
 750
 751                 $databases = $this->getCompiledDBs();
 752
 753                 $databases = array_flip( $databases );
 754                 foreach ( array_keys( $databases ) as $db ) {
 755                         $installer = $this->getDBInstaller( $db );
 756                         $status = $installer->checkPrerequisites();
 757                         if ( !$status->isGood() ) {
 758                                 $this->showStatusMessage( $status );
 759                         }
 760                         if ( !$status->isOK() ) {
 761                                 unset( $databases[$db] );
 762                         }
 763                 }
 764                 $databases = array_flip( $databases );
 765                 if ( !$databases ) {
 766                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 767
 768                         // @todo FIXME: This only works for the web installer!
 769                         return false;
 770                 }
 771
 772                 return true;
 773         }
 774
 775         /**
 776          * Some versions of libxml+PHP break < and > encoding horribly
 777          * @return bool
 778          */
 779         protected function envCheckBrokenXML() {
 780                 $test = new PhpXmlBugTester();
 781                 if ( !$test->ok ) {
 782                         $this->showError( 'config-brokenlibxml' );
 783
 784                         return false;
 785                 }
 786
 787                 return true;
 788         }
 789
 790         /**
 791          * Environment check for the PCRE module.
 792          *
 793          * @note If this check were to fail, the parser would
 794          *   probably throw an exception before the result
 795          *   of this check is shown to the user.
 796          * @return bool
 797          */
 798         protected function envCheckPCRE() {
 799                 MediaWiki\suppressWarnings();
 800                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 801                 // Need to check for \p support too, as PCRE can be compiled
 802                 // with utf8 support, but not unicode property support.
 803                 // check that \p{Zs} (space separators) matches
 804                 // U+3000 (Ideographic space)
 805                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 806                 MediaWiki\restoreWarnings();
 807                 if ( $regexd != '--' || $regexprop != '--' ) {
 808                         $this->showError( 'config-pcre-no-utf8' );
 809
 810                         return false;
 811                 }
 812
 813                 return true;
 814         }
 815
 816         /**
 817          * Environment check for available memory.
 818          * @return bool
 819          */
 820         protected function envCheckMemory() {
 821                 $limit = ini_get( 'memory_limit' );
 822
 823                 if ( !$limit || $limit == -1 ) {
 824                         return true;
 825                 }
 826
 827                 $n = wfShorthandToInteger( $limit );
 828
 829                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 830                         $newLimit = "{$this->minMemorySize}M";
 831
 832                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 833                                 $this->showMessage( 'config-memory-bad', $limit );
 834                         } else {
 835                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 836                                 $this->setVar( '_RaiseMemory', true );
 837                         }
 838                 }
 839
 840                 return true;
 841         }
 842
 843         /**
 844          * Environment check for compiled object cache types.
 845          */
 846         protected function envCheckCache() {
 847                 $caches = [];
 848                 foreach ( $this->objectCaches as $name => $function ) {
 849                         if ( function_exists( $function ) ) {
 850                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 851                                         continue;
 852                                 }
 853                                 $caches[$name] = true;
 854                         }
 855                 }
 856
 857                 if ( !$caches ) {
 858                         $key = 'config-no-cache-apcu';
 859                         $this->showMessage( $key );
 860                 }
 861
 862                 $this->setVar( '_Caches', $caches );
 863         }
 864
 865         /**
 866          * Scare user to death if they have mod_security or mod_security2
 867          * @return bool
 868          */
 869         protected function envCheckModSecurity() {
 870                 if ( self::apacheModulePresent( 'mod_security' )
 871                         || self::apacheModulePresent( 'mod_security2' ) ) {
 872                         $this->showMessage( 'config-mod-security' );
 873                 }
 874
 875                 return true;
 876         }
 877
 878         /**
 879          * Search for GNU diff3.
 880          * @return bool
 881          */
 882         protected function envCheckDiff3() {
 883                 $names = [ "gdiff3", "diff3", "diff3.exe" ];
 884                 $versionInfo = [ '$1 --version 2>&1', 'GNU diffutils' ];
 885
 886                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 887
 888                 if ( $diff3 ) {
 889                         $this->setVar( 'wgDiff3', $diff3 );
 890                 } else {
 891                         $this->setVar( 'wgDiff3', false );
 892                         $this->showMessage( 'config-diff3-bad' );
 893                 }
 894
 895                 return true;
 896         }
 897
 898         /**
 899          * Environment check for ImageMagick and GD.
 900          * @return bool
 901          */
 902         protected function envCheckGraphics() {
 903                 $names = [ wfIsWindows() ? 'convert.exe' : 'convert' ];
 904                 $versionInfo = [ '$1 -version', 'ImageMagick' ];
 905                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 906
 907                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 908                 if ( $convert ) {
 909                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 910                         $this->showMessage( 'config-imagemagick', $convert );
 911
 912                         return true;
 913                 } elseif ( function_exists( 'imagejpeg' ) ) {
 914                         $this->showMessage( 'config-gd' );
 915                 } else {
 916                         $this->showMessage( 'config-no-scaling' );
 917                 }
 918
 919                 return true;
 920         }
 921
 922         /**
 923          * Search for git.
 924          *
 925          * @since 1.22
 926          * @return bool
 927          */
 928         protected function envCheckGit() {
 929                 $names = [ wfIsWindows() ? 'git.exe' : 'git' ];
 930                 $versionInfo = [ '$1 --version', 'git version' ];
 931
 932                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 933
 934                 if ( $git ) {
 935                         $this->setVar( 'wgGitBin', $git );
 936                         $this->showMessage( 'config-git', $git );
 937                 } else {
 938                         $this->setVar( 'wgGitBin', false );
 939                         $this->showMessage( 'config-git-bad' );
 940                 }
 941
 942                 return true;
 943         }
 944
 945         /**
 946          * Environment check to inform user which server we've assumed.
 947          *
 948          * @return bool
 949          */
 950         protected function envCheckServer() {
 951                 $server = $this->envGetDefaultServer();
 952                 if ( $server !== null ) {
 953                         $this->showMessage( 'config-using-server', $server );
 954                 }
 955                 return true;
 956         }
 957
 958         /**
 959          * Environment check to inform user which paths we've assumed.
 960          *
 961          * @return bool
 962          */
 963         protected function envCheckPath() {
 964                 $this->showMessage(
 965                         'config-using-uri',
 966                         $this->getVar( 'wgServer' ),
 967                         $this->getVar( 'wgScriptPath' )
 968                 );
 969                 return true;
 970         }
 971
 972         /**
 973          * Environment check for preferred locale in shell
 974          * @return bool
 975          */
 976         protected function envCheckShellLocale() {
 977                 $os = php_uname( 's' );
 978                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 979
 980                 if ( !in_array( $os, $supported ) ) {
 981                         return true;
 982                 }
 983
 984                 # Get a list of available locales.
 985                 $ret = false;
 986                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 987
 988                 if ( $ret ) {
 989                         return true;
 990                 }
 991
 992                 $lines = array_map( 'trim', explode( "\n", $lines ) );
 993                 $candidatesByLocale = [];
 994                 $candidatesByLang = [];
 995
 996                 foreach ( $lines as $line ) {
 997                         if ( $line === '' ) {
 998                                 continue;
 999                         }
1000
1001                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1002                                 continue;
1003                         }
1004
1005                         list( , $lang, , , ) = $m;
1006
1007                         $candidatesByLocale[$m[0]] = $m;
1008                         $candidatesByLang[$lang][] = $m;
1009                 }
1010
1011                 # Try the current value of LANG.
1012                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1013                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1014
1015                         return true;
1016                 }
1017
1018                 # Try the most common ones.
1019                 $commonLocales = [ 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1020                 foreach ( $commonLocales as $commonLocale ) {
1021                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1022                                 $this->setVar( 'wgShellLocale', $commonLocale );
1023
1024                                 return true;
1025                         }
1026                 }
1027
1028                 # Is there an available locale in the Wiki's language?
1029                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1030
1031                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1032                         $m = reset( $candidatesByLang[$wikiLang] );
1033                         $this->setVar( 'wgShellLocale', $m[0] );
1034
1035                         return true;
1036                 }
1037
1038                 # Are there any at all?
1039                 if ( count( $candidatesByLocale ) ) {
1040                         $m = reset( $candidatesByLocale );
1041                         $this->setVar( 'wgShellLocale', $m[0] );
1042
1043                         return true;
1044                 }
1045
1046                 # Give up.
1047                 return true;
1048         }
1049
1050         /**
1051          * Environment check for the permissions of the uploads directory
1052          * @return bool
1053          */
1054         protected function envCheckUploadsDirectory() {
1055                 global $IP;
1056
1057                 $dir = $IP . '/images/';
1058                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1059                 $safe = !$this->dirIsExecutable( $dir, $url );
1060
1061                 if ( !$safe ) {
1062                         $this->showMessage( 'config-uploads-not-safe', $dir );
1063                 }
1064
1065                 return true;
1066         }
1067
1068         /**
1069          * Checks if suhosin.get.max_value_length is set, and if so generate
1070          * a warning because it decreases ResourceLoader performance.
1071          * @return bool
1072          */
1073         protected function envCheckSuhosinMaxValueLength() {
1074                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1075                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1076                         // Only warn if the value is below the sane 1024
1077                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1078                 }
1079
1080                 return true;
1081         }
1082
1083         /**
1084          * Convert a hex string representing a Unicode code point to that code point.
1085          * @param string $c
1086          * @return string
1087          */
1088         protected function unicodeChar( $c ) {
1089                 $c = hexdec( $c );
1090                 if ( $c <= 0x7F ) {
1091                         return chr( $c );
1092                 } elseif ( $c <= 0x7FF ) {
1093                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1094                 } elseif ( $c <= 0xFFFF ) {
1095                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1096                                 chr( 0x80 | $c & 0x3F );
1097                 } elseif ( $c <= 0x10FFFF ) {
1098                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1099                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1100                                 chr( 0x80 | $c & 0x3F );
1101                 } else {
1102                         return false;
1103                 }
1104         }
1105
1106         /**
1107          * Check the libicu version
1108          */
1109         protected function envCheckLibicu() {
1110                 /**
1111                  * This needs to be updated something that the latest libicu
1112                  * will properly normalize.  This normalization was found at
1113                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1114                  * Note that we use the hex representation to create the code
1115                  * points in order to avoid any Unicode-destroying during transit.
1116                  */
1117                 $not_normal_c = $this->unicodeChar( "FA6C" );
1118                 $normal_c = $this->unicodeChar( "242EE" );
1119
1120                 $useNormalizer = 'php';
1121                 $needsUpdate = false;
1122
1123                 if ( function_exists( 'normalizer_normalize' ) ) {
1124                         $useNormalizer = 'intl';
1125                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1126                         if ( $intl !== $normal_c ) {
1127                                 $needsUpdate = true;
1128                         }
1129                 }
1130
1131                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1132                 if ( $useNormalizer === 'php' ) {
1133                         $this->showMessage( 'config-unicode-pure-php-warning' );
1134                 } else {
1135                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1136                         if ( $needsUpdate ) {
1137                                 $this->showMessage( 'config-unicode-update-warning' );
1138                         }
1139                 }
1140         }
1141
1142         /**
1143          * Environment prep for the server hostname.
1144          */
1145         protected function envPrepServer() {
1146                 $server = $this->envGetDefaultServer();
1147                 if ( $server !== null ) {
1148                         $this->setVar( 'wgServer', $server );
1149                 }
1150         }
1151
1152         /**
1153          * Helper function to be called from envPrepServer()
1154          * @return string
1155          */
1156         abstract protected function envGetDefaultServer();
1157
1158         /**
1159          * Environment prep for setting $IP and $wgScriptPath.
1160          */
1161         protected function envPrepPath() {
1162                 global $IP;
1163                 $IP = dirname( dirname( __DIR__ ) );
1164                 $this->setVar( 'IP', $IP );
1165         }
1166
1167         /**
1168          * Get an array of likely places we can find executables. Check a bunch
1169          * of known Unix-like defaults, as well as the PATH environment variable
1170          * (which should maybe make it work for Windows?)
1171          *
1172          * @return array
1173          */
1174         protected static function getPossibleBinPaths() {
1175                 return array_merge(
1176                         [ '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1177                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ],
1178                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1179                 );
1180         }
1181
1182         /**
1183          * Search a path for any of the given executable names. Returns the
1184          * executable name if found. Also checks the version string returned
1185          * by each executable.
1186          *
1187          * Used only by environment checks.
1188          *
1189          * @param string $path Path to search
1190          * @param array $names Array of executable names
1191          * @param array|bool $versionInfo False or array with two members:
1192          *   0 => Command to run for version check, with $1 for the full executable name
1193          *   1 => String to compare the output with
1194          *
1195          * If $versionInfo is not false, only executables with a version
1196          * matching $versionInfo[1] will be returned.
1197          * @return bool|string
1198          */
1199         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1200                 if ( !is_array( $names ) ) {
1201                         $names = [ $names ];
1202                 }
1203
1204                 foreach ( $names as $name ) {
1205                         $command = $path . DIRECTORY_SEPARATOR . $name;
1206
1207                         MediaWiki\suppressWarnings();
1208                         $file_exists = is_executable( $command );
1209                         MediaWiki\restoreWarnings();
1210
1211                         if ( $file_exists ) {
1212                                 if ( !$versionInfo ) {
1213                                         return $command;
1214                                 }
1215
1216                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1217                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1218                                         return $command;
1219                                 }
1220                         }
1221                 }
1222
1223                 return false;
1224         }
1225
1226         /**
1227          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1228          * @see locateExecutable()
1229          * @param array $names Array of possible names.
1230          * @param array|bool $versionInfo Default: false or array with two members:
1231          *   0 => Command to run for version check, with $1 for the full executable name
1232          *   1 => String to compare the output with
1233          *
1234          * If $versionInfo is not false, only executables with a version
1235          * matching $versionInfo[1] will be returned.
1236          * @return bool|string
1237          */
1238         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1239                 foreach ( self::getPossibleBinPaths() as $path ) {
1240                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1241                         if ( $exe !== false ) {
1242                                 return $exe;
1243                         }
1244                 }
1245
1246                 return false;
1247         }
1248
1249         /**
1250          * Checks if scripts located in the given directory can be executed via the given URL.
1251          *
1252          * Used only by environment checks.
1253          * @param string $dir
1254          * @param string $url
1255          * @return bool|int|string
1256          */
1257         public function dirIsExecutable( $dir, $url ) {
1258                 $scriptTypes = [
1259                         'php' => [
1260                                 "<?php echo 'ex' . 'ec';",
1261                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1262                         ],
1263                 ];
1264
1265                 // it would be good to check other popular languages here, but it'll be slow.
1266
1267                 MediaWiki\suppressWarnings();
1268
1269                 foreach ( $scriptTypes as $ext => $contents ) {
1270                         foreach ( $contents as $source ) {
1271                                 $file = 'exectest.' . $ext;
1272
1273                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1274                                         break;
1275                                 }
1276
1277                                 try {
1278                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1279                                 } catch ( Exception $e ) {
1280                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1281                                         $text = null;
1282                                 }
1283                                 unlink( $dir . $file );
1284
1285                                 if ( $text == 'exec' ) {
1286                                         MediaWiki\restoreWarnings();
1287
1288                                         return $ext;
1289                                 }
1290                         }
1291                 }
1292
1293                 MediaWiki\restoreWarnings();
1294
1295                 return false;
1296         }
1297
1298         /**
1299          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1300          *
1301          * @param string $moduleName Name of module to check.
1302          * @return bool
1303          */
1304         public static function apacheModulePresent( $moduleName ) {
1305                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1306                         return true;
1307                 }
1308                 // try it the hard way
1309                 ob_start();
1310                 phpinfo( INFO_MODULES );
1311                 $info = ob_get_clean();
1312
1313                 return strpos( $info, $moduleName ) !== false;
1314         }
1315
1316         /**
1317          * ParserOptions are constructed before we determined the language, so fix it
1318          *
1319          * @param Language $lang
1320          */
1321         public function setParserLanguage( $lang ) {
1322                 $this->parserOptions->setTargetLanguage( $lang );
1323                 $this->parserOptions->setUserLang( $lang );
1324         }
1325
1326         /**
1327          * Overridden by WebInstaller to provide lastPage parameters.
1328          * @param string $page
1329          * @return string
1330          */
1331         protected function getDocUrl( $page ) {
1332                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1333         }
1334
1335         /**
1336          * Finds extensions that follow the format /$directory/Name/Name.php,
1337          * and returns an array containing the value for 'Name' for each found extension.
1338          *
1339          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1340          *
1341          * @param string $directory Directory to search in
1342          * @return array
1343          */
1344         public function findExtensions( $directory = 'extensions' ) {
1345                 if ( $this->getVar( 'IP' ) === null ) {
1346                         return [];
1347                 }
1348
1349                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1350                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1351                         return [];
1352                 }
1353
1354                 // extensions -> extension.json, skins -> skin.json
1355                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1356
1357                 $dh = opendir( $extDir );
1358                 $exts = [];
1359                 while ( ( $file = readdir( $dh ) ) !== false ) {
1360                         if ( !is_dir( "$extDir/$file" ) ) {
1361                                 continue;
1362                         }
1363                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1364                                 $exts[] = $file;
1365                         }
1366                 }
1367                 closedir( $dh );
1368                 natcasesort( $exts );
1369
1370                 return $exts;
1371         }
1372
1373         /**
1374          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1375          * but will fall back to another if the default skin is missing and some other one is present
1376          * instead.
1377          *
1378          * @param string[] $skinNames Names of installed skins.
1379          * @return string
1380          */
1381         public function getDefaultSkin( array $skinNames ) {
1382                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1383                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1384                         return $defaultSkin;
1385                 } else {
1386                         return $skinNames[0];
1387                 }
1388         }
1389
1390         /**
1391          * Installs the auto-detected extensions.
1392          *
1393          * @return Status
1394          */
1395         protected function includeExtensions() {
1396                 global $IP;
1397                 $exts = $this->getVar( '_Extensions' );
1398                 $IP = $this->getVar( 'IP' );
1399
1400                 /**
1401                  * We need to include DefaultSettings before including extensions to avoid
1402                  * warnings about unset variables. However, the only thing we really
1403                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1404                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1405                  * but we're not opening that can of worms
1406                  * @see https://phabricator.wikimedia.org/T28857
1407                  */
1408                 global $wgAutoloadClasses;
1409                 $wgAutoloadClasses = [];
1410                 $queue = [];
1411
1412                 require "$IP/includes/DefaultSettings.php";
1413
1414                 foreach ( $exts as $e ) {
1415                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1416                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1417                         } else {
1418                                 require_once "$IP/extensions/$e/$e.php";
1419                         }
1420                 }
1421
1422                 $registry = new ExtensionRegistry();
1423                 $data = $registry->readFromQueue( $queue );
1424                 $wgAutoloadClasses += $data['autoload'];
1425
1426                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1427                         $wgHooks['LoadExtensionSchemaUpdates'] : [];
1428
1429                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
1430                         $hooksWeWant = array_merge_recursive(
1431                                 $hooksWeWant,
1432                                 $data['globals']['wgHooks']['LoadExtensionSchemaUpdates']
1433                         );
1434                 }
1435                 // Unset everyone else's hooks. Lord knows what someone might be doing
1436                 // in ParserFirstCallInit (see bug 27171)
1437                 $GLOBALS['wgHooks'] = [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
1438
1439                 return Status::newGood();
1440         }
1441
1442         /**
1443          * Get an array of install steps. Should always be in the format of
1444          * array(
1445          *   'name'     => 'someuniquename',
1446          *   'callback' => array( $obj, 'method' ),
1447          * )
1448          * There must be a config-install-$name message defined per step, which will
1449          * be shown on install.
1450          *
1451          * @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
1452          * @return array
1453          */
1454         protected function getInstallSteps( DatabaseInstaller $installer ) {
1455                 $coreInstallSteps = [
1456                         [ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
1457                         [ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
1458                         [ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
1459                         [ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
1460                         [ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
1461                         [ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
1462                         [ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
1463                         [ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
1464                 ];
1465
1466                 // Build the array of install steps starting from the core install list,
1467                 // then adding any callbacks that wanted to attach after a given step
1468                 foreach ( $coreInstallSteps as $step ) {
1469                         $this->installSteps[] = $step;
1470                         if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
1471                                 $this->installSteps = array_merge(
1472                                         $this->installSteps,
1473                                         $this->extraInstallSteps[$step['name']]
1474                                 );
1475                         }
1476                 }
1477
1478                 // Prepend any steps that want to be at the beginning
1479                 if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
1480                         $this->installSteps = array_merge(
1481                                 $this->extraInstallSteps['BEGINNING'],
1482                                 $this->installSteps
1483                         );
1484                 }
1485
1486                 // Extensions should always go first, chance to tie into hooks and such
1487                 if ( count( $this->getVar( '_Extensions' ) ) ) {
1488                         array_unshift( $this->installSteps,
1489                                 [ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
1490                         );
1491                         $this->installSteps[] = [
1492                                 'name' => 'extension-tables',
1493                                 'callback' => [ $installer, 'createExtensionTables' ]
1494                         ];
1495                 }
1496
1497                 return $this->installSteps;
1498         }
1499
1500         /**
1501          * Actually perform the installation.
1502          *
1503          * @param callable $startCB A callback array for the beginning of each step
1504          * @param callable $endCB A callback array for the end of each step
1505          *
1506          * @return array Array of Status objects
1507          */
1508         public function performInstallation( $startCB, $endCB ) {
1509                 $installResults = [];
1510                 $installer = $this->getDBInstaller();
1511                 $installer->preInstall();
1512                 $steps = $this->getInstallSteps( $installer );
1513                 foreach ( $steps as $stepObj ) {
1514                         $name = $stepObj['name'];
1515                         call_user_func_array( $startCB, [ $name ] );
1516
1517                         // Perform the callback step
1518                         $status = call_user_func( $stepObj['callback'], $installer );
1519
1520                         // Output and save the results
1521                         call_user_func( $endCB, $name, $status );
1522                         $installResults[$name] = $status;
1523
1524                         // If we've hit some sort of fatal, we need to bail.
1525                         // Callback already had a chance to do output above.
1526                         if ( !$status->isOk() ) {
1527                                 break;
1528                         }
1529                 }
1530                 if ( $status->isOk() ) {
1531                         $this->setVar( '_InstallDone', true );
1532                 }
1533
1534                 return $installResults;
1535         }
1536
1537         /**
1538          * Generate $wgSecretKey. Will warn if we had to use an insecure random source.
1539          *
1540          * @return Status
1541          */
1542         public function generateKeys() {
1543                 $keys = [ 'wgSecretKey' => 64 ];
1544                 if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
1545                         $keys['wgUpgradeKey'] = 16;
1546                 }
1547
1548                 return $this->doGenerateKeys( $keys );
1549         }
1550
1551         /**
1552          * Generate a secret value for variables using our CryptRand generator.
1553          * Produce a warning if the random source was insecure.
1554          *
1555          * @param array $keys
1556          * @return Status
1557          */
1558         protected function doGenerateKeys( $keys ) {
1559                 $status = Status::newGood();
1560
1561                 $strong = true;
1562                 foreach ( $keys as $name => $length ) {
1563                         $secretKey = MWCryptRand::generateHex( $length, true );
1564                         if ( !MWCryptRand::wasStrong() ) {
1565                                 $strong = false;
1566                         }
1567
1568                         $this->setVar( $name, $secretKey );
1569                 }
1570
1571                 if ( !$strong ) {
1572                         $names = array_keys( $keys );
1573                         $names = preg_replace( '/^(.*)$/', '\$$1', $names );
1574                         global $wgLang;
1575                         $status->warning( 'config-insecure-keys', $wgLang->listToText( $names ), count( $names ) );
1576                 }
1577
1578                 return $status;
1579         }
1580
1581         /**
1582          * Create the first user account, grant it sysop and bureaucrat rights
1583          *
1584          * @return Status
1585          */
1586         protected function createSysop() {
1587                 $name = $this->getVar( '_AdminName' );
1588                 $user = User::newFromName( $name );
1589
1590                 if ( !$user ) {
1591                         // We should've validated this earlier anyway!
1592                         return Status::newFatal( 'config-admin-error-user', $name );
1593                 }
1594
1595                 if ( $user->idForName() == 0 ) {
1596                         $user->addToDatabase();
1597
1598                         try {
1599                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
1600                         } catch ( PasswordError $pwe ) {
1601                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
1602                         }
1603
1604                         $user->addGroup( 'sysop' );
1605                         $user->addGroup( 'bureaucrat' );
1606                         if ( $this->getVar( '_AdminEmail' ) ) {
1607                                 $user->setEmail( $this->getVar( '_AdminEmail' ) );
1608                         }
1609                         $user->saveSettings();
1610
1611                         // Update user count
1612                         $ssUpdate = new SiteStatsUpdate( 0, 0, 0, 0, 1 );
1613                         $ssUpdate->doUpdate();
1614                 }
1615                 $status = Status::newGood();
1616
1617                 if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
1618                         $this->subscribeToMediaWikiAnnounce( $status );
1619                 }
1620
1621                 return $status;
1622         }
1623
1624         /**
1625          * @param Status $s
1626          */
1627         private function subscribeToMediaWikiAnnounce( Status $s ) {
1628                 $params = [
1629                         'email' => $this->getVar( '_AdminEmail' ),
1630                         'language' => 'en',
1631                         'digest' => 0
1632                 ];
1633
1634                 // Mailman doesn't support as many languages as we do, so check to make
1635                 // sure their selected language is available
1636                 $myLang = $this->getVar( '_UserLang' );
1637                 if ( in_array( $myLang, $this->mediaWikiAnnounceLanguages ) ) {
1638                         $myLang = $myLang == 'pt-br' ? 'pt_BR' : $myLang; // rewrite to Mailman's pt_BR
1639                         $params['language'] = $myLang;
1640                 }
1641
1642                 if ( MWHttpRequest::canMakeRequests() ) {
1643                         $res = MWHttpRequest::factory( $this->mediaWikiAnnounceUrl,
1644                                 [ 'method' => 'POST', 'postData' => $params ], __METHOD__ )->execute();
1645                         if ( !$res->isOK() ) {
1646                                 $s->warning( 'config-install-subscribe-fail', $res->getMessage() );
1647                         }
1648                 } else {
1649                         $s->warning( 'config-install-subscribe-notpossible' );
1650                 }
1651         }
1652
1653         /**
1654          * Insert Main Page with default content.
1655          *
1656          * @param DatabaseInstaller $installer
1657          * @return Status
1658          */
1659         protected function createMainpage( DatabaseInstaller $installer ) {
1660                 $status = Status::newGood();
1661                 try {
1662                         $page = WikiPage::factory( Title::newMainPage() );
1663                         $content = new WikitextContent(
1664                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1665                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1666                         );
1667
1668                         $status = $page->doEditContent( $content,
1669                                 '',
1670                                 EDIT_NEW,
1671                                 false,
1672                                 User::newFromName( 'MediaWiki default' )
1673                         );
1674                 } catch ( Exception $e ) {
1675                         // using raw, because $wgShowExceptionDetails can not be set yet
1676                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1677                 }
1678
1679                 return $status;
1680         }
1681
1682         /**
1683          * Override the necessary bits of the config to run an installation.
1684          */
1685         public static function overrideConfig() {
1686                 // Use PHP's built-in session handling, since MediaWiki's
1687                 // SessionHandler can't work before we have an object cache set up.
1688                 define( 'MW_NO_SESSION_HANDLER', 1 );
1689
1690                 // Don't access the database
1691                 $GLOBALS['wgUseDatabaseMessages'] = false;
1692                 // Don't cache langconv tables
1693                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1694                 // Debug-friendly
1695                 $GLOBALS['wgShowExceptionDetails'] = true;
1696                 // Don't break forms
1697                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1698
1699                 // Extended debugging
1700                 $GLOBALS['wgShowSQLErrors'] = true;
1701                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1702
1703                 // Allow multiple ob_flush() calls
1704                 $GLOBALS['wgDisableOutputCompression'] = true;
1705
1706                 // Use a sensible cookie prefix (not my_wiki)
1707                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1708
1709                 // Some of the environment checks make shell requests, remove limits
1710                 $GLOBALS['wgMaxShellMemory'] = 0;
1711
1712                 // Override the default CookieSessionProvider with a dummy
1713                 // implementation that won't stomp on PHP's cookies.
1714                 $GLOBALS['wgSessionProviders'] = [
1715                         [
1716                                 'class' => 'InstallerSessionProvider',
1717                                 'args' => [ [
1718                                         'priority' => 1,
1719                                 ] ]
1720                         ]
1721                 ];
1722
1723                 // Don't try to use any object cache for SessionManager either.
1724                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1725         }
1726
1727         /**
1728          * Add an installation step following the given step.
1729          *
1730          * @param callable $callback A valid installation callback array, in this form:
1731          *    array( 'name' => 'some-unique-name', 'callback' => array( $obj, 'function' ) );
1732          * @param string $findStep The step to find. Omit to put the step at the beginning
1733          */
1734         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1735                 $this->extraInstallSteps[$findStep][] = $callback;
1736         }
1737
1738         /**
1739          * Disable the time limit for execution.
1740          * Some long-running pages (Install, Upgrade) will want to do this
1741          */
1742         protected function disableTimeLimit() {
1743                 MediaWiki\suppressWarnings();
1744                 set_time_limit( 0 );
1745                 MediaWiki\restoreWarnings();
1746         }
1747 }