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                 // $wgLogo is probably wrong (T50084); set something that will work.
 220                 // Single quotes work fine here, as LocalSettingsGenerator outputs this unescaped.
 221                 'wgLogo' => '$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                 'apcu' => 'apcu_fetch',
 248                 'wincache' => 'wincache_ucache_get'
 249         ];
 250
 251         /**
 252          * User rights profiles.
 253          *
 254          * @var array
 255          */
 256         public $rightsProfiles = [
 257                 'wiki' => [],
 258                 'no-anon' => [
 259                         '*' => [ 'edit' => false ]
 260                 ],
 261                 'fishbowl' => [
 262                         '*' => [
 263                                 'createaccount' => false,
 264                                 'edit' => false,
 265                         ],
 266                 ],
 267                 'private' => [
 268                         '*' => [
 269                                 'createaccount' => false,
 270                                 'edit' => false,
 271                                 'read' => false,
 272                         ],
 273                 ],
 274         ];
 275
 276         /**
 277          * License types.
 278          *
 279          * @var array
 280          */
 281         public $licenses = [
 282                 'cc-by' => [
 283                         'url' => 'https://creativecommons.org/licenses/by/4.0/',
 284                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
 285                 ],
 286                 'cc-by-sa' => [
 287                         'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
 288                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
 289                 ],
 290                 'cc-by-nc-sa' => [
 291                         'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
 292                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
 293                 ],
 294                 'cc-0' => [
 295                         'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
 296                         'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
 297                 ],
 298                 'gfdl' => [
 299                         'url' => 'https://www.gnu.org/copyleft/fdl.html',
 300                         'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
 301                 ],
 302                 'none' => [
 303                         'url' => '',
 304                         'icon' => '',
 305                         'text' => ''
 306                 ],
 307                 'cc-choose' => [
 308                         // Details will be filled in by the selector.
 309                         'url' => '',
 310                         'icon' => '',
 311                         'text' => '',
 312                 ],
 313         ];
 314
 315         /**
 316          * URL to mediawiki-announce subscription
 317          */
 318         protected $mediaWikiAnnounceUrl =
 319                 'https://lists.wikimedia.org/mailman/subscribe/mediawiki-announce';
 320
 321         /**
 322          * Supported language codes for Mailman
 323          */
 324         protected $mediaWikiAnnounceLanguages = [
 325                 'ca', 'cs', 'da', 'de', 'en', 'es', 'et', 'eu', 'fi', 'fr', 'hr', 'hu',
 326                 'it', 'ja', 'ko', 'lt', 'nl', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru',
 327                 'sl', 'sr', 'sv', 'tr', 'uk'
 328         ];
 329
 330         /**
 331          * UI interface for displaying a short message
 332          * The parameters are like parameters to wfMessage().
 333          * The messages will be in wikitext format, which will be converted to an
 334          * output format such as HTML or text before being sent to the user.
 335          * @param string $msg
 336          */
 337         abstract public function showMessage( $msg /*, ... */ );
 338
 339         /**
 340          * Same as showMessage(), but for displaying errors
 341          * @param string $msg
 342          */
 343         abstract public function showError( $msg /*, ... */ );
 344
 345         /**
 346          * Show a message to the installing user by using a Status object
 347          * @param Status $status
 348          */
 349         abstract public function showStatusMessage( Status $status );
 350
 351         /**
 352          * Constructs a Config object that contains configuration settings that should be
 353          * overwritten for the installation process.
 354          *
 355          * @since 1.27
 356          *
 357          * @param Config $baseConfig
 358          *
 359          * @return Config The config to use during installation.
 360          */
 361         public static function getInstallerConfig( Config $baseConfig ) {
 362                 $configOverrides = new HashConfig();
 363
 364                 // disable (problematic) object cache types explicitly, preserving all other (working) ones
 365                 // bug T113843
 366                 $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
 367
 368                 $objectCaches = [
 369                                 CACHE_NONE => $emptyCache,
 370                                 CACHE_DB => $emptyCache,
 371                                 CACHE_ANYTHING => $emptyCache,
 372                                 CACHE_MEMCACHED => $emptyCache,
 373                         ] + $baseConfig->get( 'ObjectCaches' );
 374
 375                 $configOverrides->set( 'ObjectCaches', $objectCaches );
 376
 377                 // Load the installer's i18n.
 378                 $messageDirs = $baseConfig->get( 'MessagesDirs' );
 379                 $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
 380
 381                 $configOverrides->set( 'MessagesDirs', $messageDirs );
 382
 383                 $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
 384
 385                 // make sure we use the installer config as the main config
 386                 $configRegistry = $baseConfig->get( 'ConfigRegistry' );
 387                 $configRegistry['main'] = function() use ( $installerConfig ) {
 388                         return $installerConfig;
 389                 };
 390
 391                 $configOverrides->set( 'ConfigRegistry', $configRegistry );
 392
 393                 return $installerConfig;
 394         }
 395
 396         /**
 397          * Constructor, always call this from child classes.
 398          */
 399         public function __construct() {
 400                 global $wgMemc, $wgUser, $wgObjectCaches;
 401
 402                 $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
 403                 $installerConfig = self::getInstallerConfig( $defaultConfig );
 404
 405                 // Reset all services and inject config overrides
 406                 MediaWiki\MediaWikiServices::resetGlobalInstance( $installerConfig );
 407
 408                 // Don't attempt to load user language options (T126177)
 409                 // This will be overridden in the web installer with the user-specified language
 410                 RequestContext::getMain()->setLanguage( 'en' );
 411
 412                 // Disable the i18n cache
 413                 // TODO: manage LocalisationCache singleton in MediaWikiServices
 414                 Language::getLocalisationCache()->disableBackend();
 415
 416                 // Disable all global services, since we don't have any configuration yet!
 417                 MediaWiki\MediaWikiServices::disableStorageBackend();
 418
 419                 // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
 420                 // SqlBagOStuff will then throw since we just disabled wfGetDB)
 421                 $wgObjectCaches = MediaWikiServices::getInstance()->getMainConfig()->get( 'ObjectCaches' );
 422                 $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 423
 424                 // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
 425                 $wgUser = User::newFromId( 0 );
 426                 RequestContext::getMain()->setUser( $wgUser );
 427
 428                 $this->settings = $this->internalDefaults;
 429
 430                 foreach ( $this->defaultVarNames as $var ) {
 431                         $this->settings[$var] = $GLOBALS[$var];
 432                 }
 433
 434                 $this->doEnvironmentPreps();
 435
 436                 $this->compiledDBs = [];
 437                 foreach ( self::getDBTypes() as $type ) {
 438                         $installer = $this->getDBInstaller( $type );
 439
 440                         if ( !$installer->isCompiled() ) {
 441                                 continue;
 442                         }
 443                         $this->compiledDBs[] = $type;
 444                 }
 445
 446                 $this->parserTitle = Title::newFromText( 'Installer' );
 447                 $this->parserOptions = new ParserOptions( $wgUser ); // language will be wrong :(
 448                 $this->parserOptions->setEditSection( false );
 449                 // Don't try to access DB before user language is initialised
 450                 $this->setParserLanguage( Language::factory( 'en' ) );
 451         }
 452
 453         /**
 454          * Get a list of known DB types.
 455          *
 456          * @return array
 457          */
 458         public static function getDBTypes() {
 459                 return self::$dbTypes;
 460         }
 461
 462         /**
 463          * Do initial checks of the PHP environment. Set variables according to
 464          * the observed environment.
 465          *
 466          * It's possible that this may be called under the CLI SAPI, not the SAPI
 467          * that the wiki will primarily run under. In that case, the subclass should
 468          * initialise variables such as wgScriptPath, before calling this function.
 469          *
 470          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 471          * and that sessions are working.
 472          *
 473          * @return Status
 474          */
 475         public function doEnvironmentChecks() {
 476                 // Php version has already been checked by entry scripts
 477                 // Show message here for information purposes
 478                 if ( wfIsHHVM() ) {
 479                         $this->showMessage( 'config-env-hhvm', HHVM_VERSION );
 480                 } else {
 481                         $this->showMessage( 'config-env-php', PHP_VERSION );
 482                 }
 483
 484                 $good = true;
 485                 // Must go here because an old version of PCRE can prevent other checks from completing
 486                 list( $pcreVersion ) = explode( ' ', PCRE_VERSION, 2 );
 487                 if ( version_compare( $pcreVersion, self::MINIMUM_PCRE_VERSION, '<' ) ) {
 488                         $this->showError( 'config-pcre-old', self::MINIMUM_PCRE_VERSION, $pcreVersion );
 489                         $good = false;
 490                 } else {
 491                         foreach ( $this->envChecks as $check ) {
 492                                 $status = $this->$check();
 493                                 if ( $status === false ) {
 494                                         $good = false;
 495                                 }
 496                         }
 497                 }
 498
 499                 $this->setVar( '_Environment', $good );
 500
 501                 return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
 502         }
 503
 504         public function doEnvironmentPreps() {
 505                 foreach ( $this->envPreps as $prep ) {
 506                         $this->$prep();
 507                 }
 508         }
 509
 510         /**
 511          * Set a MW configuration variable, or internal installer configuration variable.
 512          *
 513          * @param string $name
 514          * @param mixed $value
 515          */
 516         public function setVar( $name, $value ) {
 517                 $this->settings[$name] = $value;
 518         }
 519
 520         /**
 521          * Get an MW configuration variable, or internal installer configuration variable.
 522          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 523          * Installer variables are typically prefixed by an underscore.
 524          *
 525          * @param string $name
 526          * @param mixed $default
 527          *
 528          * @return mixed
 529          */
 530         public function getVar( $name, $default = null ) {
 531                 if ( !isset( $this->settings[$name] ) ) {
 532                         return $default;
 533                 } else {
 534                         return $this->settings[$name];
 535                 }
 536         }
 537
 538         /**
 539          * Get a list of DBs supported by current PHP setup
 540          *
 541          * @return array
 542          */
 543         public function getCompiledDBs() {
 544                 return $this->compiledDBs;
 545         }
 546
 547         /**
 548          * Get an instance of DatabaseInstaller for the specified DB type.
 549          *
 550          * @param mixed $type DB installer for which is needed, false to use default.
 551          *
 552          * @return DatabaseInstaller
 553          */
 554         public function getDBInstaller( $type = false ) {
 555                 if ( !$type ) {
 556                         $type = $this->getVar( 'wgDBtype' );
 557                 }
 558
 559                 $type = strtolower( $type );
 560
 561                 if ( !isset( $this->dbInstallers[$type] ) ) {
 562                         $class = ucfirst( $type ) . 'Installer';
 563                         $this->dbInstallers[$type] = new $class( $this );
 564                 }
 565
 566                 return $this->dbInstallers[$type];
 567         }
 568
 569         /**
 570          * Determine if LocalSettings.php exists. If it does, return its variables.
 571          *
 572          * @return array|false
 573          */
 574         public static function getExistingLocalSettings() {
 575                 global $IP;
 576
 577                 // You might be wondering why this is here. Well if you don't do this
 578                 // then some poorly-formed extensions try to call their own classes
 579                 // after immediately registering them. We really need to get extension
 580                 // registration out of the global scope and into a real format.
 581                 // @see https://phabricator.wikimedia.org/T69440
 582                 global $wgAutoloadClasses;
 583                 $wgAutoloadClasses = [];
 584
 585                 // @codingStandardsIgnoreStart
 586                 // LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
 587                 // Define the required globals here, to ensure, the functions can do it work correctly.
 588                 global $wgExtensionDirectory, $wgStyleDirectory;
 589                 // @codingStandardsIgnoreEnd
 590
 591                 MediaWiki\suppressWarnings();
 592                 $_lsExists = file_exists( "$IP/LocalSettings.php" );
 593                 MediaWiki\restoreWarnings();
 594
 595                 if ( !$_lsExists ) {
 596                         return false;
 597                 }
 598                 unset( $_lsExists );
 599
 600                 require "$IP/includes/DefaultSettings.php";
 601                 require "$IP/LocalSettings.php";
 602
 603                 return get_defined_vars();
 604         }
 605
 606         /**
 607          * Get a fake password for sending back to the user in HTML.
 608          * This is a security mechanism to avoid compromise of the password in the
 609          * event of session ID compromise.
 610          *
 611          * @param string $realPassword
 612          *
 613          * @return string
 614          */
 615         public function getFakePassword( $realPassword ) {
 616                 return str_repeat( '*', strlen( $realPassword ) );
 617         }
 618
 619         /**
 620          * Set a variable which stores a password, except if the new value is a
 621          * fake password in which case leave it as it is.
 622          *
 623          * @param string $name
 624          * @param mixed $value
 625          */
 626         public function setPassword( $name, $value ) {
 627                 if ( !preg_match( '/^\*+$/', $value ) ) {
 628                         $this->setVar( $name, $value );
 629                 }
 630         }
 631
 632         /**
 633          * On POSIX systems return the primary group of the webserver we're running under.
 634          * On other systems just returns null.
 635          *
 636          * This is used to advice the user that he should chgrp his mw-config/data/images directory as the
 637          * webserver user before he can install.
 638          *
 639          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 640          *
 641          * @return mixed
 642          */
 643         public static function maybeGetWebserverPrimaryGroup() {
 644                 if ( !function_exists( 'posix_getegid' ) || !function_exists( 'posix_getpwuid' ) ) {
 645                         # I don't know this, this isn't UNIX.
 646                         return null;
 647                 }
 648
 649                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 650                 # not whoever owns the current script.
 651                 $gid = posix_getegid();
 652                 $group = posix_getpwuid( $gid )['name'];
 653
 654                 return $group;
 655         }
 656
 657         /**
 658          * Convert wikitext $text to HTML.
 659          *
 660          * This is potentially error prone since many parser features require a complete
 661          * installed MW database. The solution is to just not use those features when you
 662          * write your messages. This appears to work well enough. Basic formatting and
 663          * external links work just fine.
 664          *
 665          * But in case a translator decides to throw in a "#ifexist" or internal link or
 666          * whatever, this function is guarded to catch the attempted DB access and to present
 667          * some fallback text.
 668          *
 669          * @param string $text
 670          * @param bool $lineStart
 671          * @return string
 672          */
 673         public function parse( $text, $lineStart = false ) {
 674                 global $wgParser;
 675
 676                 try {
 677                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 678                         $html = $out->getText();
 679                 } catch ( MediaWiki\Services\ServiceDisabledException $e ) {
 680                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 681
 682                         if ( !empty( $this->debug ) ) {
 683                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 684                         }
 685                 }
 686
 687                 return $html;
 688         }
 689
 690         /**
 691          * @return ParserOptions
 692          */
 693         public function getParserOptions() {
 694                 return $this->parserOptions;
 695         }
 696
 697         public function disableLinkPopups() {
 698                 $this->parserOptions->setExternalLinkTarget( false );
 699         }
 700
 701         public function restoreLinkPopups() {
 702                 global $wgExternalLinkTarget;
 703                 $this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
 704         }
 705
 706         /**
 707          * Install step which adds a row to the site_stats table with appropriate
 708          * initial values.
 709          *
 710          * @param DatabaseInstaller $installer
 711          *
 712          * @return Status
 713          */
 714         public function populateSiteStats( DatabaseInstaller $installer ) {
 715                 $status = $installer->getConnection();
 716                 if ( !$status->isOK() ) {
 717                         return $status;
 718                 }
 719                 $status->value->insert(
 720                         'site_stats',
 721                         [
 722                                 'ss_row_id' => 1,
 723                                 'ss_total_edits' => 0,
 724                                 'ss_good_articles' => 0,
 725                                 'ss_total_pages' => 0,
 726                                 'ss_users' => 0,
 727                                 'ss_images' => 0
 728                         ],
 729                         __METHOD__, 'IGNORE'
 730                 );
 731
 732                 return Status::newGood();
 733         }
 734
 735         /**
 736          * Environment check for DB types.
 737          * @return bool
 738          */
 739         protected function envCheckDB() {
 740                 global $wgLang;
 741
 742                 $allNames = [];
 743
 744                 // Messages: config-type-mysql, config-type-postgres, config-type-oracle,
 745                 // config-type-sqlite
 746                 foreach ( self::getDBTypes() as $name ) {
 747                         $allNames[] = wfMessage( "config-type-$name" )->text();
 748                 }
 749
 750                 $databases = $this->getCompiledDBs();
 751
 752                 $databases = array_flip( $databases );
 753                 foreach ( array_keys( $databases ) as $db ) {
 754                         $installer = $this->getDBInstaller( $db );
 755                         $status = $installer->checkPrerequisites();
 756                         if ( !$status->isGood() ) {
 757                                 $this->showStatusMessage( $status );
 758                         }
 759                         if ( !$status->isOK() ) {
 760                                 unset( $databases[$db] );
 761                         }
 762                 }
 763                 $databases = array_flip( $databases );
 764                 if ( !$databases ) {
 765                         $this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
 766
 767                         // @todo FIXME: This only works for the web installer!
 768                         return false;
 769                 }
 770
 771                 return true;
 772         }
 773
 774         /**
 775          * Some versions of libxml+PHP break < and > encoding horribly
 776          * @return bool
 777          */
 778         protected function envCheckBrokenXML() {
 779                 $test = new PhpXmlBugTester();
 780                 if ( !$test->ok ) {
 781                         $this->showError( 'config-brokenlibxml' );
 782
 783                         return false;
 784                 }
 785
 786                 return true;
 787         }
 788
 789         /**
 790          * Environment check for the PCRE module.
 791          *
 792          * @note If this check were to fail, the parser would
 793          *   probably throw an exception before the result
 794          *   of this check is shown to the user.
 795          * @return bool
 796          */
 797         protected function envCheckPCRE() {
 798                 MediaWiki\suppressWarnings();
 799                 $regexd = preg_replace( '/[\x{0430}-\x{04FF}]/iu', '', '-АБВГД-' );
 800                 // Need to check for \p support too, as PCRE can be compiled
 801                 // with utf8 support, but not unicode property support.
 802                 // check that \p{Zs} (space separators) matches
 803                 // U+3000 (Ideographic space)
 804                 $regexprop = preg_replace( '/\p{Zs}/u', '', "-\xE3\x80\x80-" );
 805                 MediaWiki\restoreWarnings();
 806                 if ( $regexd != '--' || $regexprop != '--' ) {
 807                         $this->showError( 'config-pcre-no-utf8' );
 808
 809                         return false;
 810                 }
 811
 812                 return true;
 813         }
 814
 815         /**
 816          * Environment check for available memory.
 817          * @return bool
 818          */
 819         protected function envCheckMemory() {
 820                 $limit = ini_get( 'memory_limit' );
 821
 822                 if ( !$limit || $limit == -1 ) {
 823                         return true;
 824                 }
 825
 826                 $n = wfShorthandToInteger( $limit );
 827
 828                 if ( $n < $this->minMemorySize * 1024 * 1024 ) {
 829                         $newLimit = "{$this->minMemorySize}M";
 830
 831                         if ( ini_set( "memory_limit", $newLimit ) === false ) {
 832                                 $this->showMessage( 'config-memory-bad', $limit );
 833                         } else {
 834                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 835                                 $this->setVar( '_RaiseMemory', true );
 836                         }
 837                 }
 838
 839                 return true;
 840         }
 841
 842         /**
 843          * Environment check for compiled object cache types.
 844          */
 845         protected function envCheckCache() {
 846                 $caches = [];
 847                 foreach ( $this->objectCaches as $name => $function ) {
 848                         if ( function_exists( $function ) ) {
 849                                 if ( $name == 'xcache' && !wfIniGetBool( 'xcache.var_size' ) ) {
 850                                         continue;
 851                                 }
 852                                 $caches[$name] = true;
 853                         }
 854                 }
 855
 856                 if ( !$caches ) {
 857                         $key = 'config-no-cache-apcu';
 858                         $this->showMessage( $key );
 859                 }
 860
 861                 $this->setVar( '_Caches', $caches );
 862         }
 863
 864         /**
 865          * Scare user to death if they have mod_security or mod_security2
 866          * @return bool
 867          */
 868         protected function envCheckModSecurity() {
 869                 if ( self::apacheModulePresent( 'mod_security' )
 870                         || self::apacheModulePresent( 'mod_security2' ) ) {
 871                         $this->showMessage( 'config-mod-security' );
 872                 }
 873
 874                 return true;
 875         }
 876
 877         /**
 878          * Search for GNU diff3.
 879          * @return bool
 880          */
 881         protected function envCheckDiff3() {
 882                 $names = [ "gdiff3", "diff3", "diff3.exe" ];
 883                 $versionInfo = [ '$1 --version 2>&1', 'GNU diffutils' ];
 884
 885                 $diff3 = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 886
 887                 if ( $diff3 ) {
 888                         $this->setVar( 'wgDiff3', $diff3 );
 889                 } else {
 890                         $this->setVar( 'wgDiff3', false );
 891                         $this->showMessage( 'config-diff3-bad' );
 892                 }
 893
 894                 return true;
 895         }
 896
 897         /**
 898          * Environment check for ImageMagick and GD.
 899          * @return bool
 900          */
 901         protected function envCheckGraphics() {
 902                 $names = [ wfIsWindows() ? 'convert.exe' : 'convert' ];
 903                 $versionInfo = [ '$1 -version', 'ImageMagick' ];
 904                 $convert = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 905
 906                 $this->setVar( 'wgImageMagickConvertCommand', '' );
 907                 if ( $convert ) {
 908                         $this->setVar( 'wgImageMagickConvertCommand', $convert );
 909                         $this->showMessage( 'config-imagemagick', $convert );
 910
 911                         return true;
 912                 } elseif ( function_exists( 'imagejpeg' ) ) {
 913                         $this->showMessage( 'config-gd' );
 914                 } else {
 915                         $this->showMessage( 'config-no-scaling' );
 916                 }
 917
 918                 return true;
 919         }
 920
 921         /**
 922          * Search for git.
 923          *
 924          * @since 1.22
 925          * @return bool
 926          */
 927         protected function envCheckGit() {
 928                 $names = [ wfIsWindows() ? 'git.exe' : 'git' ];
 929                 $versionInfo = [ '$1 --version', 'git version' ];
 930
 931                 $git = self::locateExecutableInDefaultPaths( $names, $versionInfo );
 932
 933                 if ( $git ) {
 934                         $this->setVar( 'wgGitBin', $git );
 935                         $this->showMessage( 'config-git', $git );
 936                 } else {
 937                         $this->setVar( 'wgGitBin', false );
 938                         $this->showMessage( 'config-git-bad' );
 939                 }
 940
 941                 return true;
 942         }
 943
 944         /**
 945          * Environment check to inform user which server we've assumed.
 946          *
 947          * @return bool
 948          */
 949         protected function envCheckServer() {
 950                 $server = $this->envGetDefaultServer();
 951                 if ( $server !== null ) {
 952                         $this->showMessage( 'config-using-server', $server );
 953                 }
 954                 return true;
 955         }
 956
 957         /**
 958          * Environment check to inform user which paths we've assumed.
 959          *
 960          * @return bool
 961          */
 962         protected function envCheckPath() {
 963                 $this->showMessage(
 964                         'config-using-uri',
 965                         $this->getVar( 'wgServer' ),
 966                         $this->getVar( 'wgScriptPath' )
 967                 );
 968                 return true;
 969         }
 970
 971         /**
 972          * Environment check for preferred locale in shell
 973          * @return bool
 974          */
 975         protected function envCheckShellLocale() {
 976                 $os = php_uname( 's' );
 977                 $supported = [ 'Linux', 'SunOS', 'HP-UX', 'Darwin' ]; # Tested these
 978
 979                 if ( !in_array( $os, $supported ) ) {
 980                         return true;
 981                 }
 982
 983                 # Get a list of available locales.
 984                 $ret = false;
 985                 $lines = wfShellExec( '/usr/bin/locale -a', $ret );
 986
 987                 if ( $ret ) {
 988                         return true;
 989                 }
 990
 991                 $lines = array_map( 'trim', explode( "\n", $lines ) );
 992                 $candidatesByLocale = [];
 993                 $candidatesByLang = [];
 994
 995                 foreach ( $lines as $line ) {
 996                         if ( $line === '' ) {
 997                                 continue;
 998                         }
 999
1000                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
1001                                 continue;
1002                         }
1003
1004                         list( , $lang, , , ) = $m;
1005
1006                         $candidatesByLocale[$m[0]] = $m;
1007                         $candidatesByLang[$lang][] = $m;
1008                 }
1009
1010                 # Try the current value of LANG.
1011                 if ( isset( $candidatesByLocale[getenv( 'LANG' )] ) ) {
1012                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
1013
1014                         return true;
1015                 }
1016
1017                 # Try the most common ones.
1018                 $commonLocales = [ 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' ];
1019                 foreach ( $commonLocales as $commonLocale ) {
1020                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
1021                                 $this->setVar( 'wgShellLocale', $commonLocale );
1022
1023                                 return true;
1024                         }
1025                 }
1026
1027                 # Is there an available locale in the Wiki's language?
1028                 $wikiLang = $this->getVar( 'wgLanguageCode' );
1029
1030                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
1031                         $m = reset( $candidatesByLang[$wikiLang] );
1032                         $this->setVar( 'wgShellLocale', $m[0] );
1033
1034                         return true;
1035                 }
1036
1037                 # Are there any at all?
1038                 if ( count( $candidatesByLocale ) ) {
1039                         $m = reset( $candidatesByLocale );
1040                         $this->setVar( 'wgShellLocale', $m[0] );
1041
1042                         return true;
1043                 }
1044
1045                 # Give up.
1046                 return true;
1047         }
1048
1049         /**
1050          * Environment check for the permissions of the uploads directory
1051          * @return bool
1052          */
1053         protected function envCheckUploadsDirectory() {
1054                 global $IP;
1055
1056                 $dir = $IP . '/images/';
1057                 $url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
1058                 $safe = !$this->dirIsExecutable( $dir, $url );
1059
1060                 if ( !$safe ) {
1061                         $this->showMessage( 'config-uploads-not-safe', $dir );
1062                 }
1063
1064                 return true;
1065         }
1066
1067         /**
1068          * Checks if suhosin.get.max_value_length is set, and if so generate
1069          * a warning because it decreases ResourceLoader performance.
1070          * @return bool
1071          */
1072         protected function envCheckSuhosinMaxValueLength() {
1073                 $maxValueLength = ini_get( 'suhosin.get.max_value_length' );
1074                 if ( $maxValueLength > 0 && $maxValueLength < 1024 ) {
1075                         // Only warn if the value is below the sane 1024
1076                         $this->showMessage( 'config-suhosin-max-value-length', $maxValueLength );
1077                 }
1078
1079                 return true;
1080         }
1081
1082         /**
1083          * Convert a hex string representing a Unicode code point to that code point.
1084          * @param string $c
1085          * @return string|false
1086          */
1087         protected function unicodeChar( $c ) {
1088                 $c = hexdec( $c );
1089                 if ( $c <= 0x7F ) {
1090                         return chr( $c );
1091                 } elseif ( $c <= 0x7FF ) {
1092                         return chr( 0xC0 | $c >> 6 ) . chr( 0x80 | $c & 0x3F );
1093                 } elseif ( $c <= 0xFFFF ) {
1094                         return chr( 0xE0 | $c >> 12 ) . chr( 0x80 | $c >> 6 & 0x3F ) .
1095                                 chr( 0x80 | $c & 0x3F );
1096                 } elseif ( $c <= 0x10FFFF ) {
1097                         return chr( 0xF0 | $c >> 18 ) . chr( 0x80 | $c >> 12 & 0x3F ) .
1098                                 chr( 0x80 | $c >> 6 & 0x3F ) .
1099                                 chr( 0x80 | $c & 0x3F );
1100                 } else {
1101                         return false;
1102                 }
1103         }
1104
1105         /**
1106          * Check the libicu version
1107          */
1108         protected function envCheckLibicu() {
1109                 /**
1110                  * This needs to be updated something that the latest libicu
1111                  * will properly normalize.  This normalization was found at
1112                  * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
1113                  * Note that we use the hex representation to create the code
1114                  * points in order to avoid any Unicode-destroying during transit.
1115                  */
1116                 $not_normal_c = $this->unicodeChar( "FA6C" );
1117                 $normal_c = $this->unicodeChar( "242EE" );
1118
1119                 $useNormalizer = 'php';
1120                 $needsUpdate = false;
1121
1122                 if ( function_exists( 'normalizer_normalize' ) ) {
1123                         $useNormalizer = 'intl';
1124                         $intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
1125                         if ( $intl !== $normal_c ) {
1126                                 $needsUpdate = true;
1127                         }
1128                 }
1129
1130                 // Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
1131                 if ( $useNormalizer === 'php' ) {
1132                         $this->showMessage( 'config-unicode-pure-php-warning' );
1133                 } else {
1134                         $this->showMessage( 'config-unicode-using-' . $useNormalizer );
1135                         if ( $needsUpdate ) {
1136                                 $this->showMessage( 'config-unicode-update-warning' );
1137                         }
1138                 }
1139         }
1140
1141         /**
1142          * Environment prep for the server hostname.
1143          */
1144         protected function envPrepServer() {
1145                 $server = $this->envGetDefaultServer();
1146                 if ( $server !== null ) {
1147                         $this->setVar( 'wgServer', $server );
1148                 }
1149         }
1150
1151         /**
1152          * Helper function to be called from envPrepServer()
1153          * @return string
1154          */
1155         abstract protected function envGetDefaultServer();
1156
1157         /**
1158          * Environment prep for setting $IP and $wgScriptPath.
1159          */
1160         protected function envPrepPath() {
1161                 global $IP;
1162                 $IP = dirname( dirname( __DIR__ ) );
1163                 $this->setVar( 'IP', $IP );
1164         }
1165
1166         /**
1167          * Get an array of likely places we can find executables. Check a bunch
1168          * of known Unix-like defaults, as well as the PATH environment variable
1169          * (which should maybe make it work for Windows?)
1170          *
1171          * @return array
1172          */
1173         protected static function getPossibleBinPaths() {
1174                 return array_merge(
1175                         [ '/usr/bin', '/usr/local/bin', '/opt/csw/bin',
1176                                 '/usr/gnu/bin', '/usr/sfw/bin', '/sw/bin', '/opt/local/bin' ],
1177                         explode( PATH_SEPARATOR, getenv( 'PATH' ) )
1178                 );
1179         }
1180
1181         /**
1182          * Search a path for any of the given executable names. Returns the
1183          * executable name if found. Also checks the version string returned
1184          * by each executable.
1185          *
1186          * Used only by environment checks.
1187          *
1188          * @param string $path Path to search
1189          * @param array $names Array of executable names
1190          * @param array|bool $versionInfo False or array with two members:
1191          *   0 => Command to run for version check, with $1 for the full executable name
1192          *   1 => String to compare the output with
1193          *
1194          * If $versionInfo is not false, only executables with a version
1195          * matching $versionInfo[1] will be returned.
1196          * @return bool|string
1197          */
1198         public static function locateExecutable( $path, $names, $versionInfo = false ) {
1199                 if ( !is_array( $names ) ) {
1200                         $names = [ $names ];
1201                 }
1202
1203                 foreach ( $names as $name ) {
1204                         $command = $path . DIRECTORY_SEPARATOR . $name;
1205
1206                         MediaWiki\suppressWarnings();
1207                         $file_exists = is_executable( $command );
1208                         MediaWiki\restoreWarnings();
1209
1210                         if ( $file_exists ) {
1211                                 if ( !$versionInfo ) {
1212                                         return $command;
1213                                 }
1214
1215                                 $file = str_replace( '$1', wfEscapeShellArg( $command ), $versionInfo[0] );
1216                                 if ( strstr( wfShellExec( $file ), $versionInfo[1] ) !== false ) {
1217                                         return $command;
1218                                 }
1219                         }
1220                 }
1221
1222                 return false;
1223         }
1224
1225         /**
1226          * Same as locateExecutable(), but checks in getPossibleBinPaths() by default
1227          * @see locateExecutable()
1228          * @param array $names Array of possible names.
1229          * @param array|bool $versionInfo Default: false or array with two members:
1230          *   0 => Command to run for version check, with $1 for the full executable name
1231          *   1 => String to compare the output with
1232          *
1233          * If $versionInfo is not false, only executables with a version
1234          * matching $versionInfo[1] will be returned.
1235          * @return bool|string
1236          */
1237         public static function locateExecutableInDefaultPaths( $names, $versionInfo = false ) {
1238                 foreach ( self::getPossibleBinPaths() as $path ) {
1239                         $exe = self::locateExecutable( $path, $names, $versionInfo );
1240                         if ( $exe !== false ) {
1241                                 return $exe;
1242                         }
1243                 }
1244
1245                 return false;
1246         }
1247
1248         /**
1249          * Checks if scripts located in the given directory can be executed via the given URL.
1250          *
1251          * Used only by environment checks.
1252          * @param string $dir
1253          * @param string $url
1254          * @return bool|int|string
1255          */
1256         public function dirIsExecutable( $dir, $url ) {
1257                 $scriptTypes = [
1258                         'php' => [
1259                                 "<?php echo 'ex' . 'ec';",
1260                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
1261                         ],
1262                 ];
1263
1264                 // it would be good to check other popular languages here, but it'll be slow.
1265
1266                 MediaWiki\suppressWarnings();
1267
1268                 foreach ( $scriptTypes as $ext => $contents ) {
1269                         foreach ( $contents as $source ) {
1270                                 $file = 'exectest.' . $ext;
1271
1272                                 if ( !file_put_contents( $dir . $file, $source ) ) {
1273                                         break;
1274                                 }
1275
1276                                 try {
1277                                         $text = Http::get( $url . $file, [ 'timeout' => 3 ], __METHOD__ );
1278                                 } catch ( Exception $e ) {
1279                                         // Http::get throws with allow_url_fopen = false and no curl extension.
1280                                         $text = null;
1281                                 }
1282                                 unlink( $dir . $file );
1283
1284                                 if ( $text == 'exec' ) {
1285                                         MediaWiki\restoreWarnings();
1286
1287                                         return $ext;
1288                                 }
1289                         }
1290                 }
1291
1292                 MediaWiki\restoreWarnings();
1293
1294                 return false;
1295         }
1296
1297         /**
1298          * Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
1299          *
1300          * @param string $moduleName Name of module to check.
1301          * @return bool
1302          */
1303         public static function apacheModulePresent( $moduleName ) {
1304                 if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
1305                         return true;
1306                 }
1307                 // try it the hard way
1308                 ob_start();
1309                 phpinfo( INFO_MODULES );
1310                 $info = ob_get_clean();
1311
1312                 return strpos( $info, $moduleName ) !== false;
1313         }
1314
1315         /**
1316          * ParserOptions are constructed before we determined the language, so fix it
1317          *
1318          * @param Language $lang
1319          */
1320         public function setParserLanguage( $lang ) {
1321                 $this->parserOptions->setTargetLanguage( $lang );
1322                 $this->parserOptions->setUserLang( $lang );
1323         }
1324
1325         /**
1326          * Overridden by WebInstaller to provide lastPage parameters.
1327          * @param string $page
1328          * @return string
1329          */
1330         protected function getDocUrl( $page ) {
1331                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
1332         }
1333
1334         /**
1335          * Finds extensions that follow the format /$directory/Name/Name.php,
1336          * and returns an array containing the value for 'Name' for each found extension.
1337          *
1338          * Reasonable values for $directory include 'extensions' (the default) and 'skins'.
1339          *
1340          * @param string $directory Directory to search in
1341          * @return array
1342          */
1343         public function findExtensions( $directory = 'extensions' ) {
1344                 if ( $this->getVar( 'IP' ) === null ) {
1345                         return [];
1346                 }
1347
1348                 $extDir = $this->getVar( 'IP' ) . '/' . $directory;
1349                 if ( !is_readable( $extDir ) || !is_dir( $extDir ) ) {
1350                         return [];
1351                 }
1352
1353                 // extensions -> extension.json, skins -> skin.json
1354                 $jsonFile = substr( $directory, 0, strlen( $directory ) -1 ) . '.json';
1355
1356                 $dh = opendir( $extDir );
1357                 $exts = [];
1358                 while ( ( $file = readdir( $dh ) ) !== false ) {
1359                         if ( !is_dir( "$extDir/$file" ) ) {
1360                                 continue;
1361                         }
1362                         if ( file_exists( "$extDir/$file/$jsonFile" ) || file_exists( "$extDir/$file/$file.php" ) ) {
1363                                 $exts[] = $file;
1364                         }
1365                 }
1366                 closedir( $dh );
1367                 natcasesort( $exts );
1368
1369                 return $exts;
1370         }
1371
1372         /**
1373          * Returns a default value to be used for $wgDefaultSkin: normally the one set in DefaultSettings,
1374          * but will fall back to another if the default skin is missing and some other one is present
1375          * instead.
1376          *
1377          * @param string[] $skinNames Names of installed skins.
1378          * @return string
1379          */
1380         public function getDefaultSkin( array $skinNames ) {
1381                 $defaultSkin = $GLOBALS['wgDefaultSkin'];
1382                 if ( !$skinNames || in_array( $defaultSkin, $skinNames ) ) {
1383                         return $defaultSkin;
1384                 } else {
1385                         return $skinNames[0];
1386                 }
1387         }
1388
1389         /**
1390          * Installs the auto-detected extensions.
1391          *
1392          * @return Status
1393          */
1394         protected function includeExtensions() {
1395                 global $IP;
1396                 $exts = $this->getVar( '_Extensions' );
1397                 $IP = $this->getVar( 'IP' );
1398
1399                 /**
1400                  * We need to include DefaultSettings before including extensions to avoid
1401                  * warnings about unset variables. However, the only thing we really
1402                  * want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
1403                  * if the extension has hidden hook registration in $wgExtensionFunctions,
1404                  * but we're not opening that can of worms
1405                  * @see https://phabricator.wikimedia.org/T28857
1406                  */
1407                 global $wgAutoloadClasses;
1408                 $wgAutoloadClasses = [];
1409                 $queue = [];
1410
1411                 require "$IP/includes/DefaultSettings.php";
1412
1413                 foreach ( $exts as $e ) {
1414                         if ( file_exists( "$IP/extensions/$e/extension.json" ) ) {
1415                                 $queue["$IP/extensions/$e/extension.json"] = 1;
1416                         } else {
1417                                 require_once "$IP/extensions/$e/$e.php";
1418                         }
1419                 }
1420
1421                 $registry = new ExtensionRegistry();
1422                 $data = $registry->readFromQueue( $queue );
1423                 $wgAutoloadClasses += $data['autoload'];
1424
1425                 $hooksWeWant = isset( $wgHooks['LoadExtensionSchemaUpdates'] ) ?
1426                         /** @suppress PhanUndeclaredVariable $wgHooks is set by DefaultSettings */
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 T29171)
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          * [
1445          *   'name'     => 'someuniquename',
1446          *   'callback' => [ $obj, 'method' ],
1447          * ]
1448          * There must be a config-install-$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                 $title = Title::newMainPage();
1662                 if ( $title->exists() ) {
1663                         $status->warning( 'config-install-mainpage-exists' );
1664                         return $status;
1665                 }
1666                 try {
1667                         $page = WikiPage::factory( $title );
1668                         $content = new WikitextContent(
1669                                 wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
1670                                 wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
1671                         );
1672
1673                         $status = $page->doEditContent( $content,
1674                                 '',
1675                                 EDIT_NEW,
1676                                 false,
1677                                 User::newFromName( 'MediaWiki default' )
1678                         );
1679                 } catch ( Exception $e ) {
1680                         // using raw, because $wgShowExceptionDetails can not be set yet
1681                         $status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
1682                 }
1683
1684                 return $status;
1685         }
1686
1687         /**
1688          * Override the necessary bits of the config to run an installation.
1689          */
1690         public static function overrideConfig() {
1691                 // Use PHP's built-in session handling, since MediaWiki's
1692                 // SessionHandler can't work before we have an object cache set up.
1693                 define( 'MW_NO_SESSION_HANDLER', 1 );
1694
1695                 // Don't access the database
1696                 $GLOBALS['wgUseDatabaseMessages'] = false;
1697                 // Don't cache langconv tables
1698                 $GLOBALS['wgLanguageConverterCacheType'] = CACHE_NONE;
1699                 // Debug-friendly
1700                 $GLOBALS['wgShowExceptionDetails'] = true;
1701                 // Don't break forms
1702                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
1703
1704                 // Extended debugging
1705                 $GLOBALS['wgShowSQLErrors'] = true;
1706                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
1707
1708                 // Allow multiple ob_flush() calls
1709                 $GLOBALS['wgDisableOutputCompression'] = true;
1710
1711                 // Use a sensible cookie prefix (not my_wiki)
1712                 $GLOBALS['wgCookiePrefix'] = 'mw_installer';
1713
1714                 // Some of the environment checks make shell requests, remove limits
1715                 $GLOBALS['wgMaxShellMemory'] = 0;
1716
1717                 // Override the default CookieSessionProvider with a dummy
1718                 // implementation that won't stomp on PHP's cookies.
1719                 $GLOBALS['wgSessionProviders'] = [
1720                         [
1721                                 'class' => 'InstallerSessionProvider',
1722                                 'args' => [ [
1723                                         'priority' => 1,
1724                                 ] ]
1725                         ]
1726                 ];
1727
1728                 // Don't try to use any object cache for SessionManager either.
1729                 $GLOBALS['wgSessionCacheType'] = CACHE_NONE;
1730         }
1731
1732         /**
1733          * Add an installation step following the given step.
1734          *
1735          * @param callable $callback A valid installation callback array, in this form:
1736          *    [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
1737          * @param string $findStep The step to find. Omit to put the step at the beginning
1738          */
1739         public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
1740                 $this->extraInstallSteps[$findStep][] = $callback;
1741         }
1742
1743         /**
1744          * Disable the time limit for execution.
1745          * Some long-running pages (Install, Upgrade) will want to do this
1746          */
1747         protected function disableTimeLimit() {
1748                 MediaWiki\suppressWarnings();
1749                 set_time_limit( 0 );
1750                 MediaWiki\restoreWarnings();
1751         }
1752 }