includes/installer/Installer.php

   1 <?php
   2
   3 /**
   4  * Base installer class
   5  * Handles everything that is independent of user interface
   6  */
   7 abstract class Installer {
   8         var $settings, $output;
   9
  10         /**
  11          * MediaWiki configuration globals that will eventually be passed through
  12          * to LocalSettings.php. The names only are given here, the defaults
  13          * typically come from DefaultSettings.php.
  14          * @protected
  15          */
  16         var $defaultVarNames = array(
  17                 'wgSitename',
  18                 'wgPasswordSender',
  19                 'wgLanguageCode',
  20                 'wgRightsIcon',
  21                 'wgRightsText',
  22                 'wgRightsUrl',
  23                 'wgMainCacheType',
  24                 'wgEnableEmail',
  25                 'wgEnableUserEmail',
  26                 'wgEnotifUserTalk',
  27                 'wgEnotifWatchlist',
  28                 'wgEmailAuthentication',
  29                 'wgDBtype',
  30                 'wgDiff3',
  31                 'wgImageMagickConvertCommand',
  32                 'IP',
  33                 'wgScriptPath',
  34                 'wgScriptExtension',
  35                 'wgMetaNamespace',
  36 //              'wgDeletedDirectory',
  37                 'wgEnableUploads',
  38                 'wgLogo',
  39                 'wgShellLocale',
  40                 'wgSecretKey',
  41         );
  42
  43         /**
  44          * Variables that are stored alongside globals, and are used for any
  45          * configuration of the installation process aside from the MediaWiki
  46          * configuration. Map of names to defaults.
  47          * @protected
  48          */
  49         var $internalDefaults = array(
  50                 '_UserLang' => 'en',
  51                 '_Environment' => false,
  52                 '_CompiledDBs' => array(),
  53                 '_SafeMode' => false,
  54                 '_RaiseMemory' => false,
  55                 '_UpgradeDone' => false,
  56                 '_Caches' => array(),
  57                 '_InstallUser' => 'root',
  58                 '_InstallPassword' => '',
  59                 '_SameAccount' => true,
  60                 '_CreateDBAccount' => false,
  61                 '_NamespaceType' => 'site-name',
  62                 '_AdminName' => null, // will be set later, when the user selects language
  63                 '_AdminPassword' => '',
  64                 '_AdminPassword2' => '',
  65                 '_AdminEmail' => '',
  66                 '_Subscribe' => false,
  67                 '_SkipOptional' => 'continue',
  68                 '_RightsProfile' => 'wiki',
  69                 '_LicenseCode' => 'none',
  70                 '_CCDone' => false,
  71                 '_Extensions' => array(),
  72                 '_MemCachedServers' => '',
  73         );
  74
  75         /**
  76          * Known database types. These correspond to the class names <type>Installer,
  77          * and are also MediaWiki database types valid for $wgDBtype.
  78          *
  79          * To add a new type, create a <type>Installer class and a Database<type>
  80          * class, and add a config-type-<type> message to MessagesEn.php.
  81          * @private
  82          */
  83         var $dbTypes = array(
  84                 'mysql',
  85                 'postgres',
  86                 'sqlite',
  87                 'oracle'
  88         );
  89
  90         /**
  91          * Minimum memory size in MB
  92          */
  93         private $minMemorySize = 50;
  94
  95         /**
  96          * Cached DB installer instances, access using getDBInstaller()
  97          * @private
  98          */
  99         var $dbInstallers = array();
 100
 101         /**
 102          * A list of environment check methods called by doEnvironmentChecks().
 103          * These may output warnings using showMessage(), and/or abort the
 104          * installation process by returning false.
 105          * @protected
 106          */
 107         var $envChecks = array(
 108                 'envLatestVersion',
 109                 'envCheckDB',
 110                 'envCheckRegisterGlobals',
 111                 'envCheckMagicQuotes',
 112                 'envCheckMagicSybase',
 113                 'envCheckMbstring',
 114                 'envCheckZE1',
 115                 'envCheckSafeMode',
 116                 'envCheckXML',
 117                 'envCheckPCRE',
 118                 'envCheckMemory',
 119                 'envCheckCache',
 120                 'envCheckDiff3',
 121                 'envCheckGraphics',
 122                 'envCheckPath',
 123                 'envCheckWriteableDir',
 124                 'envCheckExtension',
 125                 'envCheckShellLocale',
 126                 'envCheckUploadsDirectory',
 127         );
 128
 129         var $installSteps = array(
 130                 'database',
 131                 'tables',
 132                 'interwiki',
 133                 'secretkey',
 134                 'sysop',
 135                 'localsettings',
 136         );
 137
 138         /**
 139          * Known object cache types and the functions used to test for their existence
 140          * @protected
 141          */
 142         var $objectCaches = array(
 143                 'xcache' => 'xcache_get',
 144                 'apc' => 'apc_fetch',
 145                 'eaccel' => 'eaccelerator_get',
 146                 'wincache' => 'wincache_ucache_get'
 147         );
 148
 149         /**
 150          * User rights profiles
 151          */
 152         var $rightsProfiles = array(
 153                 'wiki' => array(),
 154                 'no-anon' => array(
 155                         '*' => array( 'edit' => false )
 156                 ),
 157                 'fishbowl' => array(
 158                         '*' => array(
 159                                 'createaccount' => false,
 160                                 'edit' => false,
 161                         ),
 162                 ),
 163                 'private' => array(
 164                         '*' => array(
 165                                 'createaccount' => false,
 166                                 'edit' => false,
 167                                 'read' => false,
 168                         ),
 169                 ),
 170         );
 171
 172         /**
 173          * License types
 174          */
 175         var $licenses = array(
 176                 'none' => array(
 177                         'url' => '',
 178                         'icon' => '',
 179                         'text' => ''
 180                 ),
 181                 'cc-by-sa' => array(
 182                         'url' => 'http://creativecommons.org/licenses/by-sa/3.0/',
 183                         'icon' => '{$wgStylePath}/common/images/cc-by-sa.png',
 184                 ),
 185                 'cc-by-nc-sa' => array(
 186                         'url' => 'http://creativecommons.org/licenses/by-nc-sa/3.0/',
 187                         'icon' => '{$wgStylePath}/common/images/cc-by-nc-sa.png',
 188                 ),
 189                 'pd' => array(
 190                         'url' => 'http://creativecommons.org/licenses/publicdomain/',
 191                         'icon' => '{$wgStylePath}/common/images/public-domain.png',
 192                 ),
 193                 'gfdl-old' => array(
 194                         'url' => 'http://www.gnu.org/licenses/old-licenses/fdl-1.2.html',
 195                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 196                 ),
 197                 'gfdl-current' => array(
 198                         'url' => 'http://www.gnu.org/copyleft/fdl.html',
 199                         'icon' => '{$wgStylePath}/common/images/gnu-fdl.png',
 200                 ),
 201                 'cc-choose' => array(
 202                         // details will be filled in by the selector
 203                         'url' => '',
 204                         'icon' => '',
 205                         'text' => '',
 206                 ),
 207         );
 208         /**
 209          * Cached Title and ParserOptions used by parse()
 210          * @private
 211          */
 212         var $parserTitle, $parserOptions;
 213
 214         /**
 215          * Constructor, always call this from child classes
 216          */
 217         function __construct() {
 218                 // Disable the i18n cache and LoadBalancer
 219                 Language::getLocalisationCache()->disableBackend();
 220                 LBFactory::disableBackend();
 221
 222                 // Load the installer's i18n file
 223                 global $wgExtensionMessagesFiles;
 224                 $wgExtensionMessagesFiles['MediawikiInstaller'] =
 225                         './includes/installer/Installer.i18n.php';
 226
 227
 228                 $this->settings = $this->internalDefaults;
 229                 foreach ( $this->defaultVarNames as $var ) {
 230                         $this->settings[$var] = $GLOBALS[$var];
 231                 }
 232                 foreach ( $this->dbTypes as $type ) {
 233                         $installer = $this->getDBInstaller( $type );
 234                         if ( !$installer->isCompiled() ) {
 235                                 continue;
 236                         }
 237                         $defaults = $installer->getGlobalDefaults();
 238                         foreach ( $installer->getGlobalNames() as $var ) {
 239                                 if ( isset( $defaults[$var] ) ) {
 240                                         $this->settings[$var] = $defaults[$var];
 241                                 } else {
 242                                         $this->settings[$var] = $GLOBALS[$var];
 243                                 }
 244                         }
 245                 }
 246
 247                 $this->parserTitle = Title::newFromText( 'Installer' );
 248                 $this->parserOptions = new ParserOptions;
 249                 $this->parserOptions->setEditSection( false );
 250         }
 251
 252         /**
 253          * UI interface for displaying a short message
 254          * The parameters are like parameters to wfMsg().
 255          * The messages will be in wikitext format, which will be converted to an
 256          * output format such as HTML or text before being sent to the user.
 257          */
 258         abstract function showMessage( $msg /*, ... */ );
 259
 260         abstract function showStatusError( $status );
 261
 262         /**
 263          * Get a list of known DB types
 264          */
 265         function getDBTypes() {
 266                 return $this->dbTypes;
 267         }
 268
 269         /**
 270          * Get an instance of InstallerDBType for the specified DB type
 271          * @param $type Mixed: DB installer for which is needed, false to use default
 272          */
 273         function getDBInstaller( $type = false ) {
 274                 if ( !$type ) {
 275                         $type = $this->getVar( 'wgDBtype' );
 276                 }
 277                 if ( !isset( $this->dbInstallers[$type] ) ) {
 278                         $class = ucfirst( $type ). 'Installer';
 279                         $this->dbInstallers[$type] = new $class( $this );
 280                 }
 281                 return $this->dbInstallers[$type];
 282         }
 283
 284         /**
 285          * Do initial checks of the PHP environment. Set variables according to
 286          * the observed environment.
 287          *
 288          * It's possible that this may be called under the CLI SAPI, not the SAPI
 289          * that the wiki will primarily run under. In that case, the subclass should
 290          * initialise variables such as wgScriptPath, before calling this function.
 291          *
 292          * Under the web subclass, it can already be assumed that PHP 5+ is in use
 293          * and that sessions are working.
 294          */
 295         function doEnvironmentChecks() {
 296                 $this->showMessage( 'config-env-php', phpversion() );
 297
 298                 $good = true;
 299                 foreach ( $this->envChecks as $check ) {
 300                         $status = $this->$check();
 301                         if ( $status === false ) {
 302                                 $good = false;
 303                         }
 304                 }
 305                 $this->setVar( '_Environment', $good );
 306                 if ( $good ) {
 307                         $this->showMessage( 'config-env-good' );
 308                 } else {
 309                         $this->showMessage( 'config-env-bad' );
 310                 }
 311                 return $good;
 312         }
 313
 314         /**
 315          * Get an MW configuration variable, or internal installer configuration variable.
 316          * The defaults come from $GLOBALS (ultimately DefaultSettings.php).
 317          * Installer variables are typically prefixed by an underscore.
 318          */
 319         function getVar( $name, $default = null ) {
 320                 if ( !isset( $this->settings[$name] ) ) {
 321                         return $default;
 322                 } else {
 323                         return $this->settings[$name];
 324                 }
 325         }
 326
 327         /**
 328          * Set a MW configuration variable, or internal installer configuration variable.
 329          */
 330         function setVar( $name, $value ) {
 331                 $this->settings[$name] = $value;
 332         }
 333
 334         /**
 335          * Exports all wg* variables stored by the installer into global scope
 336          */
 337         function exportVars() {
 338                 foreach ( $this->settings as $name => $value ) {
 339                         if ( substr( $name, 0, 2 ) == 'wg' ) {
 340                                 $GLOBALS[$name] = $value;
 341                         }
 342                 }
 343         }
 344
 345         /**
 346          * Get a fake password for sending back to the user in HTML.
 347          * This is a security mechanism to avoid compromise of the password in the
 348          * event of session ID compromise.
 349          */
 350         function getFakePassword( $realPassword ) {
 351                 return str_repeat( '*', strlen( $realPassword ) );
 352         }
 353
 354         /**
 355          * Set a variable which stores a password, except if the new value is a
 356          * fake password in which case leave it as it is.
 357          */
 358         function setPassword( $name, $value ) {
 359                 if ( !preg_match( '/^\*+$/', $value ) ) {
 360                         $this->setVar( $name, $value );
 361                 }
 362         }
 363
 364         /** Check if we're installing the latest version */
 365         function envLatestVersion() {
 366                 global $wgVersion;
 367                 $latestInfoUrl = 'http://www.mediawiki.org/w/api.php?action=mwreleases&format=json';
 368                 $latestInfo = Http::get( $latestInfoUrl );
 369                 if( !$latestInfo ) {
 370                         $this->showMessage( 'config-env-latest-can-not-check', $latestInfoUrl );
 371                         return;
 372                 }
 373                 $latestInfo = FormatJson::decode($latestInfo);
 374                 if ($latestInfo === false || !isset( $latestInfo->mwreleases ) ) {
 375                         # For when the request is successful but there's e.g. some silly man in
 376                         # the middle firewall blocking us, e.g. one of those annoying airport ones
 377                         $this->showMessage( 'config-env-latest-data-invalid', $latestInfoUrl );
 378                         return;
 379                 }
 380                 foreach( $latestInfo->mwreleases as $rel ) {
 381                         if( isset( $rel->current ) )
 382                                 $currentVersion = $rel->version;
 383                 }
 384                 if( version_compare( $wgVersion, $currentVersion, '<' ) ) {
 385                         $this->showMessage( 'config-env-latest-old' );
 386                         $this->showHelpBox( 'config-env-latest-help', $wgVersion, $currentVersion );
 387                 } elseif( version_compare( $wgVersion, $currentVersion, '>' ) ) {
 388                         $this->showMessage( 'config-env-latest-new' );
 389                 }
 390                 $this->showMessage( 'config-env-latest-ok' );
 391         }
 392
 393         /** Environment check for DB types */
 394         function envCheckDB() {
 395                 $compiledDBs = array();
 396                 $goodNames = array();
 397                 $allNames = array();
 398                 foreach ( $this->dbTypes as $name ) {
 399                         $db = $this->getDBInstaller( $name );
 400                         $readableName = wfMsg( 'config-type-' . $name );
 401                         if ( $db->isCompiled() ) {
 402                                 $compiledDBs[] = $name;
 403                                 $goodNames[] = $readableName;
 404                         }
 405                         $allNames[] = $readableName;
 406                 }
 407                 $this->setVar( '_CompiledDBs', $compiledDBs );
 408
 409                 global $wgLang;
 410                 if ( !$compiledDBs ) {
 411                         $this->showMessage( 'config-no-db' );
 412                         $this->showHelpBox( 'config-no-db-help', $wgLang->commaList( $allNames ) );
 413                         return false;
 414                 }
 415                 $this->showMessage( 'config-have-db', $wgLang->commaList( $goodNames ) );
 416         }
 417
 418         /** Environment check for register_globals */
 419         function envCheckRegisterGlobals() {
 420                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 421                         $this->showMessage( 'config-register-globals' );
 422                 }
 423         }
 424
 425         /** Environment check for magic_quotes_runtime */
 426         function envCheckMagicQuotes() {
 427                 if( wfIniGetBool( "magic_quotes_runtime" ) ) {
 428                         $this->showMessage( 'config-magic-quotes-runtime' );
 429                         return false;
 430                 }
 431         }
 432
 433         /** Environment check for magic_quotes_sybase */
 434         function envCheckMagicSybase() {
 435                 if ( wfIniGetBool( 'magic_quotes_sybase' ) ) {
 436                         $this->showMessage( 'config-magic-quotes-sybase' );
 437                         return false;
 438                 }
 439         }
 440
 441         /* Environment check for mbstring.func_overload */
 442         function envCheckMbstring() {
 443                 if ( wfIniGetBool( 'mbstring.func_overload' ) ) {
 444                         $this->showMessage( 'config-mbstring' );
 445                         return false;
 446                 }
 447         }
 448
 449         /** Environment check for zend.ze1_compatibility_mode */
 450         function envCheckZE1() {
 451                 if ( wfIniGetBool( 'zend.ze1_compatibility_mode' ) ) {
 452                         $this->showMessage( 'config-ze1' );
 453                         return false;
 454                 }
 455         }
 456
 457         /** Environment check for safe_mode */
 458         function envCheckSafeMode() {
 459                 if ( wfIniGetBool( 'safe_mode' ) ) {
 460                         $this->setVar( '_SafeMode', true );
 461                         $this->showMessage( 'config-safe-mode' );
 462                 }
 463         }
 464
 465         /** Environment check for the XML module */
 466         function envCheckXML() {
 467                 if ( !function_exists( "utf8_encode" ) ) {
 468                         $this->showMessage( 'config-xml-bad' );
 469                         return false;
 470                 }
 471                 $this->showMessage( 'config-xml-good' );
 472         }
 473
 474         /** Environment check for the PCRE module */
 475         function envCheckPCRE() {
 476                 if ( !function_exists( 'preg_match' ) ) {
 477                         $this->showMessage( 'config-pcre' );
 478                         return false;
 479                 }
 480         }
 481
 482         /** Environment check for available memory */
 483         function envCheckMemory() {
 484                 $limit = ini_get( 'memory_limit' );
 485                 if ( !$limit || $limit == -1 ) {
 486                         $this->showMessage( 'config-memory-none' );
 487                         return true;
 488                 }
 489                 $n = intval( $limit );
 490                 if( preg_match( '/^([0-9]+)[Mm]$/', trim( $limit ), $m ) ) {
 491                         $n = intval( $m[1] * (1024*1024) );
 492                 }
 493                 if( $n < $this->minMemorySize*1024*1024 ) {
 494                         $newLimit = "{$this->minMemorySize}M";
 495                         if( false === ini_set( "memory_limit", $newLimit ) ) {
 496                                 $this->showMessage( 'config-memory-bad', $limit );
 497                         } else {
 498                                 $this->showMessage( 'config-memory-raised', $limit, $newLimit );
 499                                 $this->setVar( '_RaiseMemory', true );
 500                         }
 501                 } else {
 502                         $this->showMessage( 'config-memory-ok', $limit );
 503                 }
 504         }
 505
 506         /** Environment check for compiled object cache types */
 507         function envCheckCache() {
 508                 $caches = array();
 509                 foreach ( $this->objectCaches as $name => $function ) {
 510                         if ( function_exists( $function ) ) {
 511                                 $caches[$name] = true;
 512                                 $this->showMessage( 'config-' . $name );
 513                         }
 514                 }
 515                 if ( !$caches ) {
 516                         $this->showMessage( 'config-no-cache' );
 517                 }
 518                 $this->setVar( '_Caches', $caches );
 519         }
 520
 521         /** Search for GNU diff3 */
 522         function envCheckDiff3() {
 523                 $paths = array_merge(
 524                         array(
 525                                 "/usr/bin",
 526                                 "/usr/local/bin",
 527                                 "/opt/csw/bin",
 528                                 "/usr/gnu/bin",
 529                                 "/usr/sfw/bin" ),
 530                         explode( PATH_SEPARATOR, getenv( "PATH" ) ) );
 531                 $names = array( "gdiff3", "diff3", "diff3.exe" );
 532
 533                 $versionInfo = array( '$1 --version 2>&1', 'diff3 (GNU diffutils)' );
 534                 $haveDiff3 = false;
 535                 foreach ( $paths as $path ) {
 536                         $exe = $this->locateExecutable( $path, $names, $versionInfo );
 537                         if ($exe !== false) {
 538                                 $this->setVar( 'wgDiff3', $exe );
 539                                 $haveDiff3 = true;
 540                                 break;
 541                         }
 542                 }
 543                 if ( $haveDiff3 ) {
 544                         $this->showMessage( 'config-diff3-good', $exe );
 545                 } else {
 546                         $this->setVar( 'wgDiff3', false );
 547                         $this->showMessage( 'config-diff3-bad' );
 548                 }
 549         }
 550
 551         /**
 552          * Search a path for any of the given executable names. Returns the
 553          * executable name if found. Also checks the version string returned
 554          * by each executable
 555          *
 556          * @param $path String: path to search
 557          * @param $names Array of executable names
 558          * @param $versionInfo Boolean false or array with two members:
 559          *       0 => Command to run for version check, with $1 for the path
 560          *       1 => String to compare the output with
 561          *
 562          * If $versionInfo is not false, only executables with a version
 563          * matching $versionInfo[1] will be returned.
 564          */
 565         function locateExecutable( $path, $names, $versionInfo = false ) {
 566                 if (!is_array($names))
 567                         $names = array($names);
 568
 569                 foreach ($names as $name) {
 570                         $command = "$path/$name";
 571                         if ( @file_exists( $command ) ) {
 572                                 if ( !$versionInfo )
 573                                         return $command;
 574
 575                                 $file = str_replace( '$1', $command, $versionInfo[0] );
 576                                 if ( strstr( wfShellExec( $file ), $versionInfo[1]) !== false )
 577                                         return $command;
 578                         }
 579                 }
 580                 return false;
 581         }
 582
 583         /** Environment check for ImageMagick and GD */
 584         function envCheckGraphics() {
 585                 $imcheck = array( "/usr/bin", "/opt/csw/bin", "/usr/local/bin", "/sw/bin", "/opt/local/bin" );
 586                 foreach( $imcheck as $dir ) {
 587                         $im = "$dir/convert";
 588                         if( @file_exists( $im ) ) {
 589                                 $this->showMessage( 'config-imagemagick', $im );
 590                                 $this->setVar( 'wgImageMagickConvertCommand', $im );
 591                                 return true;
 592                         }
 593                 }
 594                 if ( function_exists( 'imagejpeg' ) ) {
 595                         $this->showMessage( 'config-gd' );
 596                         return true;
 597                 }
 598                 $this->showMessage( 'no-scaling' );
 599         }
 600
 601         /** Environment check for setting $IP and $wgScriptPath */
 602         function envCheckPath() {
 603                 $IP = dirname( dirname( dirname( __FILE__ ) ) );
 604                 $this->setVar( 'IP', $IP );
 605                 $this->showMessage( 'config-dir', $IP );
 606
 607                 // PHP_SELF isn't available sometimes, such as when PHP is CGI but
 608                 // cgi.fix_pathinfo is disabled. In that case, fall back to SCRIPT_NAME
 609                 // to get the path to the current script... hopefully it's reliable. SIGH
 610                 if ( !empty( $_SERVER['PHP_SELF'] ) ) {
 611                         $path = $_SERVER['PHP_SELF'];
 612                 } elseif ( !empty( $_SERVER['SCRIPT_NAME'] ) ) {
 613                         $path = $_SERVER['SCRIPT_NAME'];
 614                 } elseif ( $this->getVar( 'wgScriptPath' ) ) {
 615                         // Some kind soul has set it for us already (e.g. debconf)
 616                         return true;
 617                 } else {
 618                         $this->showMessage( 'config-no-uri' );
 619                         return false;
 620                 }
 621                 $uri = preg_replace( '{^(.*)/config.*$}', '$1', $path );
 622                 $this->setVar( 'wgScriptPath', $uri );
 623                 $this->showMessage( 'config-uri', $uri );
 624         }
 625
 626         /** Environment check for writable config/ directory */
 627         function envCheckWriteableDir() {
 628                 $ipDir = $this->getVar( 'IP' );
 629                 $configDir = $ipDir . '/config';
 630                 if( !is_writeable( $configDir ) ) {
 631                         $webserverGroup = self::maybeGetWebserverPrimaryGroup();
 632                         if ( $webserverGroup !== null ) {
 633                                 $this->showMessage( 'config-dir-not-writable-group', $ipDir, $webserverGroup );
 634                         } else {
 635                                 $this->showMessage( 'config-dir-not-writable-nogroup', $ipDir, $webserverGroup );
 636                         }
 637                         return false;
 638                 }
 639         }
 640
 641         /** Environment check for setting the preferred PHP file extension */
 642         function envCheckExtension() {
 643                 // FIXME: detect this properly
 644                 if ( defined( 'MW_INSTALL_PHP5_EXT' ) ) {
 645                         $ext = 'php5';
 646                 } else {
 647                         $ext = 'php';
 648                 }
 649                 $this->setVar( 'wgScriptExtension', ".$ext" );
 650                 $this->showMessage( 'config-file-extension', $ext );
 651         }
 652
 653         function envCheckShellLocale() {
 654                 # Give up now if we're in safe mode or open_basedir
 655                 # It's theoretically possible but tricky to work with
 656                 if ( wfIniGetBool( "safe_mode" ) || ini_get( 'open_basedir' ) || !function_exists( 'exec' ) ) {
 657                         return true;
 658                 }
 659
 660                 $os = php_uname( 's' );
 661                 $supported = array( 'Linux', 'SunOS', 'HP-UX' ); # Tested these
 662                 if ( !in_array( $os, $supported ) ) {
 663                         return true;
 664                 }
 665
 666                 # Get a list of available locales
 667                 $lines = $ret = false;
 668                 exec( '/usr/bin/locale -a', $lines, $ret );
 669                 if ( $ret ) {
 670                         return true;
 671                 }
 672
 673                 $lines = wfArrayMap( 'trim', $lines );
 674                 $candidatesByLocale = array();
 675                 $candidatesByLang = array();
 676                 foreach ( $lines as $line ) {
 677                         if ( $line === '' ) {
 678                                 continue;
 679                         }
 680                         if ( !preg_match( '/^([a-zA-Z]+)(_[a-zA-Z]+|)\.(utf8|UTF-8)(@[a-zA-Z_]*|)$/i', $line, $m ) ) {
 681                                 continue;
 682                         }
 683                         list( $all, $lang, $territory, $charset, $modifier ) = $m;
 684                         $candidatesByLocale[$m[0]] = $m;
 685                         $candidatesByLang[$lang][] = $m;
 686                 }
 687
 688                 # Try the current value of LANG
 689                 if ( isset( $candidatesByLocale[ getenv( 'LANG' ) ] ) ) {
 690                         $this->setVar( 'wgShellLocale', getenv( 'LANG' ) );
 691                         $this->showMessage( 'config-shell-locale', getenv( 'LANG' ) );
 692                         return true;
 693                 }
 694
 695                 # Try the most common ones
 696                 $commonLocales = array( 'en_US.UTF-8', 'en_US.utf8', 'de_DE.UTF-8', 'de_DE.utf8' );
 697                 foreach ( $commonLocales as $commonLocale ) {
 698                         if ( isset( $candidatesByLocale[$commonLocale] ) ) {
 699                                 $this->setVar( 'wgShellLocale', $commonLocale );
 700                                 $this->showMessage( 'config-shell-locale', $commonLocale );
 701                                 return true;
 702                         }
 703                 }
 704
 705                 # Is there an available locale in the Wiki's language?
 706                 $wikiLang = $this->getVar( 'wgLanguageCode' );
 707                 if ( isset( $candidatesByLang[$wikiLang] ) ) {
 708                         $m = reset( $candidatesByLang[$wikiLang] );
 709                         $this->setVar( 'wgShellLocale', $m[0] );
 710                         $this->showMessage( 'config-shell-locale', $m[0] );
 711                         return true;
 712                 }
 713
 714                 # Are there any at all?
 715                 if ( count( $candidatesByLocale ) ) {
 716                         $m = reset( $candidatesByLocale );
 717                         $this->setVar( 'wgShellLocale', $m[0] );
 718                         $this->showMessage( 'config-shell-locale', $m[0] );
 719                         return true;
 720                 }
 721
 722                 # Give up
 723                 return true;
 724         }
 725
 726         function envCheckUploadsDirectory() {
 727                 global $IP, $wgServer;
 728                 $dir = $IP . '/images/';
 729                 $url = $wgServer . $this->getVar( 'wgScriptPath' ) . '/images/';
 730                 $safe = !$this->dirIsExecutable( $dir, $url );
 731                 if ( $safe ) {
 732                         $this->showMessage( 'config-uploads-safe' );
 733                 } else {
 734                         $this->showMessage( 'config-uploads-not-safe', $dir );
 735                 }
 736         }
 737
 738         /**
 739          * Checks if scripts located in the given directory can be executed via the given URL
 740          */
 741         function dirIsExecutable( $dir, $url ) {
 742                 $scriptTypes = array(
 743                         'php' => array(
 744                                 "<?php echo 'ex' . 'ec';",
 745                                 "#!/var/env php5\n<?php echo 'ex' . 'ec';",
 746                         ),
 747                 );
 748                 // it would be good to check other popular languages here, but it'll be slow
 749
 750                 wfSuppressWarnings();
 751                 foreach ( $scriptTypes as $ext => $contents ) {
 752                         foreach ( $contents as $source ) {
 753                                 $file = 'exectest.' . $ext;
 754                                 if ( !file_put_contents( $dir . $file, $source ) ) {
 755                                         break;
 756                                 }
 757                                 $text = Http::get( $url . $file );
 758                                 unlink( $dir . $file );
 759                                 if ( $text == 'exec' ) {
 760                                         wfRestoreWarnings();
 761                                         return $ext;
 762                                 }
 763                         }
 764                 }
 765                 wfRestoreWarnings();
 766                 return false;
 767         }
 768
 769         /**
 770          * Convert wikitext $text to HTML.
 771          *
 772          * This is potentially error prone since many parser features require a complete
 773          * installed MW database. The solution is to just not use those features when you
 774          * write your messages. This appears to work well enough. Basic formatting and
 775          * external links work just fine.
 776          *
 777          * But in case a translator decides to throw in a #ifexist or internal link or
 778          * whatever, this function is guarded to catch attempted DB access and to present
 779          * some fallback text.
 780          *
 781          * @param $text String
 782          * @param $lineStart Boolean
 783          * @return String
 784          */
 785         function parse( $text, $lineStart = false ) {
 786                 global $wgParser;
 787                 try {
 788                         $out = $wgParser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
 789                         $html = $out->getText();
 790                 } catch ( DBAccessError $e ) {
 791                         $html = '<!--DB access attempted during parse-->  ' . htmlspecialchars( $text );
 792                         if ( !empty( $this->debug ) ) {
 793                                 $html .= "<!--\n" . $e->getTraceAsString() . "\n-->";
 794                         }
 795                 }
 796                 return $html;
 797         }
 798
 799         /**
 800          * Extension tag hook for a documentation link
 801          */
 802         function docLink( $linkText, $attribs, $parser ) {
 803                 $url = $this->getDocUrl( $attribs['href'] );
 804                 return '<a href="' . htmlspecialchars( $url ) . '">' .
 805                         htmlspecialchars( $linkText ) .
 806                         '</a>';
 807         }
 808
 809         /**
 810          * Overridden by WebInstaller to provide lastPage parameters
 811          */
 812         protected function getDocUrl( $page ) {
 813                 return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $attribs['href'] );
 814         }
 815
 816         public function findExtensions() {
 817                 if( $this->getVar( 'IP' ) === null ) {
 818                         return false;
 819                 }
 820                 $exts = array();
 821                 $dir = $this->getVar( 'IP' ) . '/extensions';
 822                 $dh = opendir( $dir );
 823                 while ( ( $file = readdir( $dh ) ) !== false ) {
 824                         if( file_exists( "$dir/$file/$file.php" ) ) {
 825                                 $exts[] = $file;
 826                         }
 827                 }
 828                 $this->setVar( '_Extensions', $exts );
 829                 return $exts;
 830         }
 831
 832         public function getInstallSteps() {
 833                 if( $this->getVar( '_UpgradeDone' ) ) {
 834                         $this->installSteps = array( 'localsettings' );
 835                 }
 836                 if( count( $this->getVar( '_Extensions' ) ) ) {
 837                         array_unshift( $this->installSteps, 'extensions' );
 838                 }
 839                 return $this->installSteps;
 840         }
 841
 842         public function installExtensions() {
 843                 global $wgHooks, $wgAutoloadClasses;
 844                 $exts = $this->getVar( '_Extensions' );
 845                 $path = $this->getVar( 'IP' ) . '/extensions';
 846                 foreach( $exts as $e ) {
 847                         require( "$path/$e/$e.php" );
 848                 }
 849                 return Status::newGood();
 850         }
 851
 852         public function installDatabase() {
 853                 $installer = $this->getDBInstaller( $this->getVar( 'wgDBtype' ) );
 854                 $status = $installer->setupDatabase();
 855                 return $status;
 856         }
 857
 858         public function installTables() {
 859                 $installer = $this->getDBInstaller();
 860                 $status = $installer->createTables();
 861                 if( $status->isGood() ) {
 862                         LBFactory::enableBackend();
 863                 }
 864                 return $status;
 865         }
 866
 867         public function installInterwiki() {
 868                 $installer = $this->getDBInstaller();
 869                 return $installer->populateInterwikiTable();
 870         }
 871
 872         public function installSecretKey() {
 873                 $file = wfIsWindows() ? null : @fopen( "/dev/urandom", "r" );
 874                 if ( $file ) {
 875                         $secretKey = bin2hex( fread( $file, 32 ) );
 876                         fclose( $file );
 877                 } else {
 878                         $secretKey = "";
 879                         for ( $i=0; $i<8; $i++ ) {
 880                                 $secretKey .= dechex(mt_rand(0, 0x7fffffff));
 881                         }
 882                         $this->output->addWarningMsg( 'config-insecure-secretkey' );
 883                 }
 884                 $this->setVar( 'wgSecretKey', $secretKey );
 885                 return Status::newGood();
 886         }
 887
 888         public function installSysop() {
 889                 $name = $this->getVar( '_AdminName' );
 890                 $user = User::newFromName( $name );
 891                 if ( !$user ) {
 892                         // we should've validated this earlier anyway!
 893                         return Status::newFatal( 'config-admin-error-user', $name );
 894                 }
 895                 if ( $user->idForName() == 0 ) {
 896                         $user->addToDatabase();
 897                         try {
 898                                 $user->setPassword( $this->getVar( '_AdminPassword' ) );
 899                         } catch( PasswordError $pwe ) {
 900                                 return Status::newFatal( 'config-admin-error-password', $name, $pwe->getMessage() );
 901                         }
 902                         $user->addGroup( 'sysop' );
 903                         $user->addGroup( 'bureaucrat' );
 904                         $user->saveSettings();
 905                 }
 906                 return Status::newGood();
 907         }
 908
 909         public function installLocalsettings() {
 910                 $localSettings = new LocalSettingsGenerator( $this );
 911                 return $localSettings->writeLocalSettings();
 912         }
 913
 914         /**
 915          * On POSIX systems return the primary group of the webserver we're running under.
 916          * On other systems just returns null.
 917          *
 918          * This is used to advice the user that he should chgrp his config/data/images directory as the
 919          * webserver user before he can install.
 920          *
 921          * Public because SqliteInstaller needs it, and doesn't subclass Installer.
 922          *
 923          * @return String
 924          */
 925         public static function maybeGetWebserverPrimaryGroup() {
 926                 if ( ! function_exists('posix_getegid') || ! function_exists('posix_getpwuid') ) {
 927                         # I don't know this, this isn't UNIX
 928                         return null;
 929                 }
 930
 931                 # posix_getegid() *not* getmygid() because we want the group of the webserver,
 932                 # not whoever owns the current script
 933                 $gid = posix_getegid();
 934                 $getpwuid = posix_getpwuid( $gid );
 935                 $group = $getpwuid["name"];
 936
 937                 return $group;
 938         }
 939
 940         /**
 941          * Override the necessary bits of the config to run an installation
 942          */
 943         public static function overrideConfig() {
 944                 define( 'MW_NO_SESSION', 1 );
 945
 946                 // Don't access the database
 947                 $GLOBALS['wgUseDatabaseMessages'] = false;
 948                 // Debug-friendly
 949                 $GLOBALS['wgShowExceptionDetails'] = true;
 950                 // Don't break forms
 951                 $GLOBALS['wgExternalLinkTarget'] = '_blank';
 952
 953                 // Extended debugging. Maybe disable before release?
 954                 $GLOBALS['wgShowSQLErrors'] = true;
 955                 $GLOBALS['wgShowDBErrorBacktrace'] = true;
 956         }
 957 }