includes/installer/PostgresInstaller.php

   1 <?php
   2 /**
   3  * PostgreSQL-specific installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 use Wikimedia\Rdbms\Database;
  25
  26 /**
  27  * Class for setting up the MediaWiki database using Postgres.
  28  *
  29  * @ingroup Deployment
  30  * @since 1.17
  31  */
  32 class PostgresInstaller extends DatabaseInstaller {
  33
  34         protected $globalNames = [
  35                 'wgDBserver',
  36                 'wgDBport',
  37                 'wgDBname',
  38                 'wgDBuser',
  39                 'wgDBpassword',
  40                 'wgDBmwschema',
  41         ];
  42
  43         protected $internalDefaults = [
  44                 '_InstallUser' => 'postgres',
  45         ];
  46
  47         public $minimumVersion = '8.3';
  48         public $maxRoleSearchDepth = 5;
  49
  50         protected $pgConns = [];
  51
  52         function getName() {
  53                 return 'postgres';
  54         }
  55
  56         public function isCompiled() {
  57                 return self::checkExtension( 'pgsql' );
  58         }
  59
  60         function getConnectForm() {
  61                 return $this->getTextBox(
  62                         'wgDBserver',
  63                         'config-db-host',
  64                         [],
  65                         $this->parent->getHelpBox( 'config-db-host-help' )
  66                 ) .
  67                         $this->getTextBox( 'wgDBport', 'config-db-port' ) .
  68                         Html::openElement( 'fieldset' ) .
  69                         Html::element( 'legend', [], wfMessage( 'config-db-wiki-settings' )->text() ) .
  70                         $this->getTextBox(
  71                                 'wgDBname',
  72                                 'config-db-name',
  73                                 [],
  74                                 $this->parent->getHelpBox( 'config-db-name-help' )
  75                         ) .
  76                         $this->getTextBox(
  77                                 'wgDBmwschema',
  78                                 'config-db-schema',
  79                                 [],
  80                                 $this->parent->getHelpBox( 'config-db-schema-help' )
  81                         ) .
  82                         Html::closeElement( 'fieldset' ) .
  83                         $this->getInstallUserBox();
  84         }
  85
  86         function submitConnectForm() {
  87                 // Get variables from the request
  88                 $newValues = $this->setVarsFromRequest( [
  89                         'wgDBserver',
  90                         'wgDBport',
  91                         'wgDBname',
  92                         'wgDBmwschema'
  93                 ] );
  94
  95                 // Validate them
  96                 $status = Status::newGood();
  97                 if ( !strlen( $newValues['wgDBname'] ) ) {
  98                         $status->fatal( 'config-missing-db-name' );
  99                 } elseif ( !preg_match( '/^[a-zA-Z0-9_]+$/', $newValues['wgDBname'] ) ) {
 100                         $status->fatal( 'config-invalid-db-name', $newValues['wgDBname'] );
 101                 }
 102                 if ( !preg_match( '/^[a-zA-Z0-9_]*$/', $newValues['wgDBmwschema'] ) ) {
 103                         $status->fatal( 'config-invalid-schema', $newValues['wgDBmwschema'] );
 104                 }
 105
 106                 // Submit user box
 107                 if ( $status->isOK() ) {
 108                         $status->merge( $this->submitInstallUserBox() );
 109                 }
 110                 if ( !$status->isOK() ) {
 111                         return $status;
 112                 }
 113
 114                 $status = $this->getPgConnection( 'create-db' );
 115                 if ( !$status->isOK() ) {
 116                         return $status;
 117                 }
 118                 /**
 119                  * @var $conn Database
 120                  */
 121                 $conn = $status->value;
 122
 123                 // Check version
 124                 $version = $conn->getServerVersion();
 125                 if ( version_compare( $version, $this->minimumVersion ) < 0 ) {
 126                         return Status::newFatal( 'config-postgres-old', $this->minimumVersion, $version );
 127                 }
 128
 129                 $this->setVar( 'wgDBuser', $this->getVar( '_InstallUser' ) );
 130                 $this->setVar( 'wgDBpassword', $this->getVar( '_InstallPassword' ) );
 131
 132                 return Status::newGood();
 133         }
 134
 135         public function getConnection() {
 136                 $status = $this->getPgConnection( 'create-tables' );
 137                 if ( $status->isOK() ) {
 138                         $this->db = $status->value;
 139                 }
 140
 141                 return $status;
 142         }
 143
 144         public function openConnection() {
 145                 return $this->openPgConnection( 'create-tables' );
 146         }
 147
 148         /**
 149          * Open a PG connection with given parameters
 150          * @param string $user User name
 151          * @param string $password Password
 152          * @param string $dbName Database name
 153          * @param string $schema Database schema
 154          * @return Status
 155          */
 156         protected function openConnectionWithParams( $user, $password, $dbName, $schema ) {
 157                 $status = Status::newGood();
 158                 try {
 159                         $db = Database::factory( 'postgres', [
 160                                 'host' => $this->getVar( 'wgDBserver' ),
 161                                 'port' => $this->getVar( 'wgDBport' ),
 162                                 'user' => $user,
 163                                 'password' => $password,
 164                                 'dbname' => $dbName,
 165                                 'schema' => $schema,
 166                                 'keywordTableMap' => [ 'user' => 'mwuser', 'text' => 'pagecontent' ],
 167                         ] );
 168                         $status->value = $db;
 169                 } catch ( DBConnectionError $e ) {
 170                         $status->fatal( 'config-connection-error', $e->getMessage() );
 171                 }
 172
 173                 return $status;
 174         }
 175
 176         /**
 177          * Get a special type of connection
 178          * @param string $type See openPgConnection() for details.
 179          * @return Status
 180          */
 181         protected function getPgConnection( $type ) {
 182                 if ( isset( $this->pgConns[$type] ) ) {
 183                         return Status::newGood( $this->pgConns[$type] );
 184                 }
 185                 $status = $this->openPgConnection( $type );
 186
 187                 if ( $status->isOK() ) {
 188                         /**
 189                          * @var $conn Database
 190                          */
 191                         $conn = $status->value;
 192                         $conn->clearFlag( DBO_TRX );
 193                         $conn->commit( __METHOD__ );
 194                         $this->pgConns[$type] = $conn;
 195                 }
 196
 197                 return $status;
 198         }
 199
 200         /**
 201          * Get a connection of a specific PostgreSQL-specific type. Connections
 202          * of a given type are cached.
 203          *
 204          * PostgreSQL lacks cross-database operations, so after the new database is
 205          * created, you need to make a separate connection to connect to that
 206          * database and add tables to it.
 207          *
 208          * New tables are owned by the user that creates them, and MediaWiki's
 209          * PostgreSQL support has always assumed that the table owner will be
 210          * $wgDBuser. So before we create new tables, we either need to either
 211          * connect as the other user or to execute a SET ROLE command. Using a
 212          * separate connection for this allows us to avoid accidental cross-module
 213          * dependencies.
 214          *
 215          * @param string $type The type of connection to get:
 216          *    - create-db:     A connection for creating DBs, suitable for pre-
 217          *                     installation.
 218          *    - create-schema: A connection to the new DB, for creating schemas and
 219          *                     other similar objects in the new DB.
 220          *    - create-tables: A connection with a role suitable for creating tables.
 221          *
 222          * @throws MWException
 223          * @return Status On success, a connection object will be in the value member.
 224          */
 225         protected function openPgConnection( $type ) {
 226                 switch ( $type ) {
 227                         case 'create-db':
 228                                 return $this->openConnectionToAnyDB(
 229                                         $this->getVar( '_InstallUser' ),
 230                                         $this->getVar( '_InstallPassword' ) );
 231                         case 'create-schema':
 232                                 return $this->openConnectionWithParams(
 233                                         $this->getVar( '_InstallUser' ),
 234                                         $this->getVar( '_InstallPassword' ),
 235                                         $this->getVar( 'wgDBname' ),
 236                                         $this->getVar( 'wgDBmwschema' ) );
 237                         case 'create-tables':
 238                                 $status = $this->openPgConnection( 'create-schema' );
 239                                 if ( $status->isOK() ) {
 240                                         /**
 241                                          * @var $conn Database
 242                                          */
 243                                         $conn = $status->value;
 244                                         $safeRole = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 245                                         $conn->query( "SET ROLE $safeRole" );
 246                                 }
 247
 248                                 return $status;
 249                         default:
 250                                 throw new MWException( "Invalid special connection type: \"$type\"" );
 251                 }
 252         }
 253
 254         public function openConnectionToAnyDB( $user, $password ) {
 255                 $dbs = [
 256                         'template1',
 257                         'postgres',
 258                 ];
 259                 if ( !in_array( $this->getVar( 'wgDBname' ), $dbs ) ) {
 260                         array_unshift( $dbs, $this->getVar( 'wgDBname' ) );
 261                 }
 262                 $conn = false;
 263                 $status = Status::newGood();
 264                 foreach ( $dbs as $db ) {
 265                         try {
 266                                 $p = [
 267                                         'host' => $this->getVar( 'wgDBserver' ),
 268                                         'user' => $user,
 269                                         'password' => $password,
 270                                         'dbname' => $db
 271                                 ];
 272                                 $conn = Database::factory( 'postgres', $p );
 273                         } catch ( DBConnectionError $error ) {
 274                                 $conn = false;
 275                                 $status->fatal( 'config-pg-test-error', $db,
 276                                         $error->getMessage() );
 277                         }
 278                         if ( $conn !== false ) {
 279                                 break;
 280                         }
 281                 }
 282                 if ( $conn !== false ) {
 283                         return Status::newGood( $conn );
 284                 } else {
 285                         return $status;
 286                 }
 287         }
 288
 289         protected function getInstallUserPermissions() {
 290                 $status = $this->getPgConnection( 'create-db' );
 291                 if ( !$status->isOK() ) {
 292                         return false;
 293                 }
 294                 /**
 295                  * @var $conn Database
 296                  */
 297                 $conn = $status->value;
 298                 $superuser = $this->getVar( '_InstallUser' );
 299
 300                 $row = $conn->selectRow( '"pg_catalog"."pg_roles"', '*',
 301                         [ 'rolname' => $superuser ], __METHOD__ );
 302
 303                 return $row;
 304         }
 305
 306         protected function canCreateAccounts() {
 307                 $perms = $this->getInstallUserPermissions();
 308                 if ( !$perms ) {
 309                         return false;
 310                 }
 311
 312                 return $perms->rolsuper === 't' || $perms->rolcreaterole === 't';
 313         }
 314
 315         protected function isSuperUser() {
 316                 $perms = $this->getInstallUserPermissions();
 317                 if ( !$perms ) {
 318                         return false;
 319                 }
 320
 321                 return $perms->rolsuper === 't';
 322         }
 323
 324         public function getSettingsForm() {
 325                 if ( $this->canCreateAccounts() ) {
 326                         $noCreateMsg = false;
 327                 } else {
 328                         $noCreateMsg = 'config-db-web-no-create-privs';
 329                 }
 330                 $s = $this->getWebUserBox( $noCreateMsg );
 331
 332                 return $s;
 333         }
 334
 335         public function submitSettingsForm() {
 336                 $status = $this->submitWebUserBox();
 337                 if ( !$status->isOK() ) {
 338                         return $status;
 339                 }
 340
 341                 $same = $this->getVar( 'wgDBuser' ) === $this->getVar( '_InstallUser' );
 342
 343                 if ( $same ) {
 344                         $exists = true;
 345                 } else {
 346                         // Check if the web user exists
 347                         // Connect to the database with the install user
 348                         $status = $this->getPgConnection( 'create-db' );
 349                         if ( !$status->isOK() ) {
 350                                 return $status;
 351                         }
 352                         $exists = $status->value->roleExists( $this->getVar( 'wgDBuser' ) );
 353                 }
 354
 355                 // Validate the create checkbox
 356                 if ( $this->canCreateAccounts() && !$same && !$exists ) {
 357                         $create = $this->getVar( '_CreateDBAccount' );
 358                 } else {
 359                         $this->setVar( '_CreateDBAccount', false );
 360                         $create = false;
 361                 }
 362
 363                 if ( !$create && !$exists ) {
 364                         if ( $this->canCreateAccounts() ) {
 365                                 $msg = 'config-install-user-missing-create';
 366                         } else {
 367                                 $msg = 'config-install-user-missing';
 368                         }
 369
 370                         return Status::newFatal( $msg, $this->getVar( 'wgDBuser' ) );
 371                 }
 372
 373                 if ( !$exists ) {
 374                         // No more checks to do
 375                         return Status::newGood();
 376                 }
 377
 378                 // Existing web account. Test the connection.
 379                 $status = $this->openConnectionToAnyDB(
 380                         $this->getVar( 'wgDBuser' ),
 381                         $this->getVar( 'wgDBpassword' ) );
 382                 if ( !$status->isOK() ) {
 383                         return $status;
 384                 }
 385
 386                 // The web user is conventionally the table owner in PostgreSQL
 387                 // installations. Make sure the install user is able to create
 388                 // objects on behalf of the web user.
 389                 if ( $same || $this->canCreateObjectsForWebUser() ) {
 390                         return Status::newGood();
 391                 } else {
 392                         return Status::newFatal( 'config-pg-not-in-role' );
 393                 }
 394         }
 395
 396         /**
 397          * Returns true if the install user is able to create objects owned
 398          * by the web user, false otherwise.
 399          * @return bool
 400          */
 401         protected function canCreateObjectsForWebUser() {
 402                 if ( $this->isSuperUser() ) {
 403                         return true;
 404                 }
 405
 406                 $status = $this->getPgConnection( 'create-db' );
 407                 if ( !$status->isOK() ) {
 408                         return false;
 409                 }
 410                 $conn = $status->value;
 411                 $installerId = $conn->selectField( '"pg_catalog"."pg_roles"', 'oid',
 412                         [ 'rolname' => $this->getVar( '_InstallUser' ) ], __METHOD__ );
 413                 $webId = $conn->selectField( '"pg_catalog"."pg_roles"', 'oid',
 414                         [ 'rolname' => $this->getVar( 'wgDBuser' ) ], __METHOD__ );
 415
 416                 return $this->isRoleMember( $conn, $installerId, $webId, $this->maxRoleSearchDepth );
 417         }
 418
 419         /**
 420          * Recursive helper for canCreateObjectsForWebUser().
 421          * @param Database $conn
 422          * @param int $targetMember Role ID of the member to look for
 423          * @param int $group Role ID of the group to look for
 424          * @param int $maxDepth Maximum recursive search depth
 425          * @return bool
 426          */
 427         protected function isRoleMember( $conn, $targetMember, $group, $maxDepth ) {
 428                 if ( $targetMember === $group ) {
 429                         // A role is always a member of itself
 430                         return true;
 431                 }
 432                 // Get all members of the given group
 433                 $res = $conn->select( '"pg_catalog"."pg_auth_members"', [ 'member' ],
 434                         [ 'roleid' => $group ], __METHOD__ );
 435                 foreach ( $res as $row ) {
 436                         if ( $row->member == $targetMember ) {
 437                                 // Found target member
 438                                 return true;
 439                         }
 440                         // Recursively search each member of the group to see if the target
 441                         // is a member of it, up to the given maximum depth.
 442                         if ( $maxDepth > 0 ) {
 443                                 if ( $this->isRoleMember( $conn, $targetMember, $row->member, $maxDepth - 1 ) ) {
 444                                         // Found member of member
 445                                         return true;
 446                                 }
 447                         }
 448                 }
 449
 450                 return false;
 451         }
 452
 453         public function preInstall() {
 454                 $createDbAccount = [
 455                         'name' => 'user',
 456                         'callback' => [ $this, 'setupUser' ],
 457                 ];
 458                 $commitCB = [
 459                         'name' => 'pg-commit',
 460                         'callback' => [ $this, 'commitChanges' ],
 461                 ];
 462                 $plpgCB = [
 463                         'name' => 'pg-plpgsql',
 464                         'callback' => [ $this, 'setupPLpgSQL' ],
 465                 ];
 466                 $schemaCB = [
 467                         'name' => 'schema',
 468                         'callback' => [ $this, 'setupSchema' ]
 469                 ];
 470
 471                 if ( $this->getVar( '_CreateDBAccount' ) ) {
 472                         $this->parent->addInstallStep( $createDbAccount, 'database' );
 473                 }
 474                 $this->parent->addInstallStep( $commitCB, 'interwiki' );
 475                 $this->parent->addInstallStep( $plpgCB, 'database' );
 476                 $this->parent->addInstallStep( $schemaCB, 'database' );
 477         }
 478
 479         function setupDatabase() {
 480                 $status = $this->getPgConnection( 'create-db' );
 481                 if ( !$status->isOK() ) {
 482                         return $status;
 483                 }
 484                 $conn = $status->value;
 485
 486                 $dbName = $this->getVar( 'wgDBname' );
 487
 488                 $exists = $conn->selectField( '"pg_catalog"."pg_database"', '1',
 489                         [ 'datname' => $dbName ], __METHOD__ );
 490                 if ( !$exists ) {
 491                         $safedb = $conn->addIdentifierQuotes( $dbName );
 492                         $conn->query( "CREATE DATABASE $safedb", __METHOD__ );
 493                 }
 494
 495                 return Status::newGood();
 496         }
 497
 498         function setupSchema() {
 499                 // Get a connection to the target database
 500                 $status = $this->getPgConnection( 'create-schema' );
 501                 if ( !$status->isOK() ) {
 502                         return $status;
 503                 }
 504                 $conn = $status->value;
 505
 506                 // Create the schema if necessary
 507                 $schema = $this->getVar( 'wgDBmwschema' );
 508                 $safeschema = $conn->addIdentifierQuotes( $schema );
 509                 $safeuser = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 510                 if ( !$conn->schemaExists( $schema ) ) {
 511                         try {
 512                                 $conn->query( "CREATE SCHEMA $safeschema AUTHORIZATION $safeuser" );
 513                         } catch ( DBQueryError $e ) {
 514                                 return Status::newFatal( 'config-install-pg-schema-failed',
 515                                         $this->getVar( '_InstallUser' ), $schema );
 516                         }
 517                 }
 518
 519                 // Select the new schema in the current connection
 520                 $conn->determineCoreSchema( $schema );
 521
 522                 return Status::newGood();
 523         }
 524
 525         function commitChanges() {
 526                 $this->db->commit( __METHOD__ );
 527
 528                 return Status::newGood();
 529         }
 530
 531         function setupUser() {
 532                 if ( !$this->getVar( '_CreateDBAccount' ) ) {
 533                         return Status::newGood();
 534                 }
 535
 536                 $status = $this->getPgConnection( 'create-db' );
 537                 if ( !$status->isOK() ) {
 538                         return $status;
 539                 }
 540                 $conn = $status->value;
 541
 542                 $safeuser = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 543                 $safepass = $conn->addQuotes( $this->getVar( 'wgDBpassword' ) );
 544
 545                 // Check if the user already exists
 546                 $userExists = $conn->roleExists( $this->getVar( 'wgDBuser' ) );
 547                 if ( !$userExists ) {
 548                         // Create the user
 549                         try {
 550                                 $sql = "CREATE ROLE $safeuser NOCREATEDB LOGIN PASSWORD $safepass";
 551
 552                                 // If the install user is not a superuser, we need to make the install
 553                                 // user a member of the new user's group, so that the install user will
 554                                 // be able to create a schema and other objects on behalf of the new user.
 555                                 if ( !$this->isSuperUser() ) {
 556                                         $sql .= ' ROLE' . $conn->addIdentifierQuotes( $this->getVar( '_InstallUser' ) );
 557                                 }
 558
 559                                 $conn->query( $sql, __METHOD__ );
 560                         } catch ( DBQueryError $e ) {
 561                                 return Status::newFatal( 'config-install-user-create-failed',
 562                                         $this->getVar( 'wgDBuser' ), $e->getMessage() );
 563                         }
 564                 }
 565
 566                 return Status::newGood();
 567         }
 568
 569         function getLocalSettings() {
 570                 $port = $this->getVar( 'wgDBport' );
 571                 $schema = $this->getVar( 'wgDBmwschema' );
 572
 573                 return "# Postgres specific settings
 574 \$wgDBport = \"{$port}\";
 575 \$wgDBmwschema = \"{$schema}\";";
 576         }
 577
 578         public function preUpgrade() {
 579                 global $wgDBuser, $wgDBpassword;
 580
 581                 # Normal user and password are selected after this step, so for now
 582                 # just copy these two
 583                 $wgDBuser = $this->getVar( '_InstallUser' );
 584                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 585         }
 586
 587         public function createTables() {
 588                 $schema = $this->getVar( 'wgDBmwschema' );
 589
 590                 $status = $this->getConnection();
 591                 if ( !$status->isOK() ) {
 592                         return $status;
 593                 }
 594
 595                 /** @var $conn DatabasePostgres */
 596                 $conn = $status->value;
 597
 598                 if ( $conn->tableExists( 'archive' ) ) {
 599                         $status->warning( 'config-install-tables-exist' );
 600                         $this->enableLB();
 601
 602                         return $status;
 603                 }
 604
 605                 $conn->begin( __METHOD__ );
 606
 607                 if ( !$conn->schemaExists( $schema ) ) {
 608                         $status->fatal( 'config-install-pg-schema-not-exist' );
 609
 610                         return $status;
 611                 }
 612                 $error = $conn->sourceFile( $this->getSchemaPath( $conn ) );
 613                 if ( $error !== true ) {
 614                         $conn->reportQueryError( $error, 0, '', __METHOD__ );
 615                         $conn->rollback( __METHOD__ );
 616                         $status->fatal( 'config-install-tables-failed', $error );
 617                 } else {
 618                         $conn->commit( __METHOD__ );
 619                 }
 620                 // Resume normal operations
 621                 if ( $status->isOK() ) {
 622                         $this->enableLB();
 623                 }
 624
 625                 return $status;
 626         }
 627
 628         public function getGlobalDefaults() {
 629                 // The default $wgDBmwschema is null, which breaks Postgres and other DBMSes that require
 630                 // the use of a schema, so we need to set it here
 631                 return array_merge( parent::getGlobalDefaults(), [
 632                         'wgDBmwschema' => 'mediawiki',
 633                 ] );
 634         }
 635
 636         public function setupPLpgSQL() {
 637                 // Connect as the install user, since it owns the database and so is
 638                 // the user that needs to run "CREATE LANGAUGE"
 639                 $status = $this->getPgConnection( 'create-schema' );
 640                 if ( !$status->isOK() ) {
 641                         return $status;
 642                 }
 643                 /**
 644                  * @var $conn Database
 645                  */
 646                 $conn = $status->value;
 647
 648                 $exists = $conn->selectField( '"pg_catalog"."pg_language"', 1,
 649                         [ 'lanname' => 'plpgsql' ], __METHOD__ );
 650                 if ( $exists ) {
 651                         // Already exists, nothing to do
 652                         return Status::newGood();
 653                 }
 654
 655                 // plpgsql is not installed, but if we have a pg_pltemplate table, we
 656                 // should be able to create it
 657                 $exists = $conn->selectField(
 658                         [ '"pg_catalog"."pg_class"', '"pg_catalog"."pg_namespace"' ],
 659                         1,
 660                         [
 661                                 'pg_namespace.oid=relnamespace',
 662                                 'nspname' => 'pg_catalog',
 663                                 'relname' => 'pg_pltemplate',
 664                         ],
 665                         __METHOD__ );
 666                 if ( $exists ) {
 667                         try {
 668                                 $conn->query( 'CREATE LANGUAGE plpgsql' );
 669                         } catch ( DBQueryError $e ) {
 670                                 return Status::newFatal( 'config-pg-no-plpgsql', $this->getVar( 'wgDBname' ) );
 671                         }
 672                 } else {
 673                         return Status::newFatal( 'config-pg-no-plpgsql', $this->getVar( 'wgDBname' ) );
 674                 }
 675
 676                 return Status::newGood();
 677         }
 678 }