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 use Wikimedia\Rdbms\DBQueryError;
  26 use Wikimedia\Rdbms\DBConnectionError;
  27
  28 /**
  29  * Class for setting up the MediaWiki database using Postgres.
  30  *
  31  * @ingroup Deployment
  32  * @since 1.17
  33  */
  34 class PostgresInstaller extends DatabaseInstaller {
  35
  36         protected $globalNames = [
  37                 'wgDBserver',
  38                 'wgDBport',
  39                 'wgDBname',
  40                 'wgDBuser',
  41                 'wgDBpassword',
  42                 'wgDBmwschema',
  43         ];
  44
  45         protected $internalDefaults = [
  46                 '_InstallUser' => 'postgres',
  47         ];
  48
  49         public $minimumVersion = '8.3';
  50         public $maxRoleSearchDepth = 5;
  51
  52         protected $pgConns = [];
  53
  54         function getName() {
  55                 return 'postgres';
  56         }
  57
  58         public function isCompiled() {
  59                 return self::checkExtension( 'pgsql' );
  60         }
  61
  62         function getConnectForm() {
  63                 return $this->getTextBox(
  64                         'wgDBserver',
  65                         'config-db-host',
  66                         [],
  67                         $this->parent->getHelpBox( 'config-db-host-help' )
  68                 ) .
  69                         $this->getTextBox( 'wgDBport', 'config-db-port' ) .
  70                         Html::openElement( 'fieldset' ) .
  71                         Html::element( 'legend', [], wfMessage( 'config-db-wiki-settings' )->text() ) .
  72                         $this->getTextBox(
  73                                 'wgDBname',
  74                                 'config-db-name',
  75                                 [],
  76                                 $this->parent->getHelpBox( 'config-db-name-help' )
  77                         ) .
  78                         $this->getTextBox(
  79                                 'wgDBmwschema',
  80                                 'config-db-schema',
  81                                 [],
  82                                 $this->parent->getHelpBox( 'config-db-schema-help' )
  83                         ) .
  84                         Html::closeElement( 'fieldset' ) .
  85                         $this->getInstallUserBox();
  86         }
  87
  88         function submitConnectForm() {
  89                 // Get variables from the request
  90                 $newValues = $this->setVarsFromRequest( [
  91                         'wgDBserver',
  92                         'wgDBport',
  93                         'wgDBname',
  94                         'wgDBmwschema'
  95                 ] );
  96
  97                 // Validate them
  98                 $status = Status::newGood();
  99                 if ( !strlen( $newValues['wgDBname'] ) ) {
 100                         $status->fatal( 'config-missing-db-name' );
 101                 } elseif ( !preg_match( '/^[a-zA-Z0-9_]+$/', $newValues['wgDBname'] ) ) {
 102                         $status->fatal( 'config-invalid-db-name', $newValues['wgDBname'] );
 103                 }
 104                 if ( !preg_match( '/^[a-zA-Z0-9_]*$/', $newValues['wgDBmwschema'] ) ) {
 105                         $status->fatal( 'config-invalid-schema', $newValues['wgDBmwschema'] );
 106                 }
 107
 108                 // Submit user box
 109                 if ( $status->isOK() ) {
 110                         $status->merge( $this->submitInstallUserBox() );
 111                 }
 112                 if ( !$status->isOK() ) {
 113                         return $status;
 114                 }
 115
 116                 $status = $this->getPgConnection( 'create-db' );
 117                 if ( !$status->isOK() ) {
 118                         return $status;
 119                 }
 120                 /**
 121                  * @var $conn Database
 122                  */
 123                 $conn = $status->value;
 124
 125                 // Check version
 126                 $version = $conn->getServerVersion();
 127                 if ( version_compare( $version, $this->minimumVersion ) < 0 ) {
 128                         return Status::newFatal( 'config-postgres-old', $this->minimumVersion, $version );
 129                 }
 130
 131                 $this->setVar( 'wgDBuser', $this->getVar( '_InstallUser' ) );
 132                 $this->setVar( 'wgDBpassword', $this->getVar( '_InstallPassword' ) );
 133
 134                 return Status::newGood();
 135         }
 136
 137         public function getConnection() {
 138                 $status = $this->getPgConnection( 'create-tables' );
 139                 if ( $status->isOK() ) {
 140                         $this->db = $status->value;
 141                 }
 142
 143                 return $status;
 144         }
 145
 146         public function openConnection() {
 147                 return $this->openPgConnection( 'create-tables' );
 148         }
 149
 150         /**
 151          * Open a PG connection with given parameters
 152          * @param string $user User name
 153          * @param string $password Password
 154          * @param string $dbName Database name
 155          * @param string $schema Database schema
 156          * @return Status
 157          */
 158         protected function openConnectionWithParams( $user, $password, $dbName, $schema ) {
 159                 $status = Status::newGood();
 160                 try {
 161                         $db = Database::factory( 'postgres', [
 162                                 'host' => $this->getVar( 'wgDBserver' ),
 163                                 'port' => $this->getVar( 'wgDBport' ),
 164                                 'user' => $user,
 165                                 'password' => $password,
 166                                 'dbname' => $dbName,
 167                                 'schema' => $schema,
 168                                 'keywordTableMap' => [ 'user' => 'mwuser', 'text' => 'pagecontent' ],
 169                         ] );
 170                         $status->value = $db;
 171                 } catch ( DBConnectionError $e ) {
 172                         $status->fatal( 'config-connection-error', $e->getMessage() );
 173                 }
 174
 175                 return $status;
 176         }
 177
 178         /**
 179          * Get a special type of connection
 180          * @param string $type See openPgConnection() for details.
 181          * @return Status
 182          */
 183         protected function getPgConnection( $type ) {
 184                 if ( isset( $this->pgConns[$type] ) ) {
 185                         return Status::newGood( $this->pgConns[$type] );
 186                 }
 187                 $status = $this->openPgConnection( $type );
 188
 189                 if ( $status->isOK() ) {
 190                         /**
 191                          * @var $conn Database
 192                          */
 193                         $conn = $status->value;
 194                         $conn->clearFlag( DBO_TRX );
 195                         $conn->commit( __METHOD__ );
 196                         $this->pgConns[$type] = $conn;
 197                 }
 198
 199                 return $status;
 200         }
 201
 202         /**
 203          * Get a connection of a specific PostgreSQL-specific type. Connections
 204          * of a given type are cached.
 205          *
 206          * PostgreSQL lacks cross-database operations, so after the new database is
 207          * created, you need to make a separate connection to connect to that
 208          * database and add tables to it.
 209          *
 210          * New tables are owned by the user that creates them, and MediaWiki's
 211          * PostgreSQL support has always assumed that the table owner will be
 212          * $wgDBuser. So before we create new tables, we either need to either
 213          * connect as the other user or to execute a SET ROLE command. Using a
 214          * separate connection for this allows us to avoid accidental cross-module
 215          * dependencies.
 216          *
 217          * @param string $type The type of connection to get:
 218          *    - create-db:     A connection for creating DBs, suitable for pre-
 219          *                     installation.
 220          *    - create-schema: A connection to the new DB, for creating schemas and
 221          *                     other similar objects in the new DB.
 222          *    - create-tables: A connection with a role suitable for creating tables.
 223          *
 224          * @throws MWException
 225          * @return Status On success, a connection object will be in the value member.
 226          */
 227         protected function openPgConnection( $type ) {
 228                 switch ( $type ) {
 229                         case 'create-db':
 230                                 return $this->openConnectionToAnyDB(
 231                                         $this->getVar( '_InstallUser' ),
 232                                         $this->getVar( '_InstallPassword' ) );
 233                         case 'create-schema':
 234                                 return $this->openConnectionWithParams(
 235                                         $this->getVar( '_InstallUser' ),
 236                                         $this->getVar( '_InstallPassword' ),
 237                                         $this->getVar( 'wgDBname' ),
 238                                         $this->getVar( 'wgDBmwschema' ) );
 239                         case 'create-tables':
 240                                 $status = $this->openPgConnection( 'create-schema' );
 241                                 if ( $status->isOK() ) {
 242                                         /**
 243                                          * @var $conn Database
 244                                          */
 245                                         $conn = $status->value;
 246                                         $safeRole = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 247                                         $conn->query( "SET ROLE $safeRole" );
 248                                 }
 249
 250                                 return $status;
 251                         default:
 252                                 throw new MWException( "Invalid special connection type: \"$type\"" );
 253                 }
 254         }
 255
 256         public function openConnectionToAnyDB( $user, $password ) {
 257                 $dbs = [
 258                         'template1',
 259                         'postgres',
 260                 ];
 261                 if ( !in_array( $this->getVar( 'wgDBname' ), $dbs ) ) {
 262                         array_unshift( $dbs, $this->getVar( 'wgDBname' ) );
 263                 }
 264                 $conn = false;
 265                 $status = Status::newGood();
 266                 foreach ( $dbs as $db ) {
 267                         try {
 268                                 $p = [
 269                                         'host' => $this->getVar( 'wgDBserver' ),
 270                                         'user' => $user,
 271                                         'password' => $password,
 272                                         'dbname' => $db
 273                                 ];
 274                                 $conn = Database::factory( 'postgres', $p );
 275                         } catch ( DBConnectionError $error ) {
 276                                 $conn = false;
 277                                 $status->fatal( 'config-pg-test-error', $db,
 278                                         $error->getMessage() );
 279                         }
 280                         if ( $conn !== false ) {
 281                                 break;
 282                         }
 283                 }
 284                 if ( $conn !== false ) {
 285                         return Status::newGood( $conn );
 286                 } else {
 287                         return $status;
 288                 }
 289         }
 290
 291         protected function getInstallUserPermissions() {
 292                 $status = $this->getPgConnection( 'create-db' );
 293                 if ( !$status->isOK() ) {
 294                         return false;
 295                 }
 296                 /**
 297                  * @var $conn Database
 298                  */
 299                 $conn = $status->value;
 300                 $superuser = $this->getVar( '_InstallUser' );
 301
 302                 $row = $conn->selectRow( '"pg_catalog"."pg_roles"', '*',
 303                         [ 'rolname' => $superuser ], __METHOD__ );
 304
 305                 return $row;
 306         }
 307
 308         protected function canCreateAccounts() {
 309                 $perms = $this->getInstallUserPermissions();
 310                 if ( !$perms ) {
 311                         return false;
 312                 }
 313
 314                 return $perms->rolsuper === 't' || $perms->rolcreaterole === 't';
 315         }
 316
 317         protected function isSuperUser() {
 318                 $perms = $this->getInstallUserPermissions();
 319                 if ( !$perms ) {
 320                         return false;
 321                 }
 322
 323                 return $perms->rolsuper === 't';
 324         }
 325
 326         public function getSettingsForm() {
 327                 if ( $this->canCreateAccounts() ) {
 328                         $noCreateMsg = false;
 329                 } else {
 330                         $noCreateMsg = 'config-db-web-no-create-privs';
 331                 }
 332                 $s = $this->getWebUserBox( $noCreateMsg );
 333
 334                 return $s;
 335         }
 336
 337         public function submitSettingsForm() {
 338                 $status = $this->submitWebUserBox();
 339                 if ( !$status->isOK() ) {
 340                         return $status;
 341                 }
 342
 343                 $same = $this->getVar( 'wgDBuser' ) === $this->getVar( '_InstallUser' );
 344
 345                 if ( $same ) {
 346                         $exists = true;
 347                 } else {
 348                         // Check if the web user exists
 349                         // Connect to the database with the install user
 350                         $status = $this->getPgConnection( 'create-db' );
 351                         if ( !$status->isOK() ) {
 352                                 return $status;
 353                         }
 354                         $exists = $status->value->roleExists( $this->getVar( 'wgDBuser' ) );
 355                 }
 356
 357                 // Validate the create checkbox
 358                 if ( $this->canCreateAccounts() && !$same && !$exists ) {
 359                         $create = $this->getVar( '_CreateDBAccount' );
 360                 } else {
 361                         $this->setVar( '_CreateDBAccount', false );
 362                         $create = false;
 363                 }
 364
 365                 if ( !$create && !$exists ) {
 366                         if ( $this->canCreateAccounts() ) {
 367                                 $msg = 'config-install-user-missing-create';
 368                         } else {
 369                                 $msg = 'config-install-user-missing';
 370                         }
 371
 372                         return Status::newFatal( $msg, $this->getVar( 'wgDBuser' ) );
 373                 }
 374
 375                 if ( !$exists ) {
 376                         // No more checks to do
 377                         return Status::newGood();
 378                 }
 379
 380                 // Existing web account. Test the connection.
 381                 $status = $this->openConnectionToAnyDB(
 382                         $this->getVar( 'wgDBuser' ),
 383                         $this->getVar( 'wgDBpassword' ) );
 384                 if ( !$status->isOK() ) {
 385                         return $status;
 386                 }
 387
 388                 // The web user is conventionally the table owner in PostgreSQL
 389                 // installations. Make sure the install user is able to create
 390                 // objects on behalf of the web user.
 391                 if ( $same || $this->canCreateObjectsForWebUser() ) {
 392                         return Status::newGood();
 393                 } else {
 394                         return Status::newFatal( 'config-pg-not-in-role' );
 395                 }
 396         }
 397
 398         /**
 399          * Returns true if the install user is able to create objects owned
 400          * by the web user, false otherwise.
 401          * @return bool
 402          */
 403         protected function canCreateObjectsForWebUser() {
 404                 if ( $this->isSuperUser() ) {
 405                         return true;
 406                 }
 407
 408                 $status = $this->getPgConnection( 'create-db' );
 409                 if ( !$status->isOK() ) {
 410                         return false;
 411                 }
 412                 $conn = $status->value;
 413                 $installerId = $conn->selectField( '"pg_catalog"."pg_roles"', 'oid',
 414                         [ 'rolname' => $this->getVar( '_InstallUser' ) ], __METHOD__ );
 415                 $webId = $conn->selectField( '"pg_catalog"."pg_roles"', 'oid',
 416                         [ 'rolname' => $this->getVar( 'wgDBuser' ) ], __METHOD__ );
 417
 418                 return $this->isRoleMember( $conn, $installerId, $webId, $this->maxRoleSearchDepth );
 419         }
 420
 421         /**
 422          * Recursive helper for canCreateObjectsForWebUser().
 423          * @param Database $conn
 424          * @param int $targetMember Role ID of the member to look for
 425          * @param int $group Role ID of the group to look for
 426          * @param int $maxDepth Maximum recursive search depth
 427          * @return bool
 428          */
 429         protected function isRoleMember( $conn, $targetMember, $group, $maxDepth ) {
 430                 if ( $targetMember === $group ) {
 431                         // A role is always a member of itself
 432                         return true;
 433                 }
 434                 // Get all members of the given group
 435                 $res = $conn->select( '"pg_catalog"."pg_auth_members"', [ 'member' ],
 436                         [ 'roleid' => $group ], __METHOD__ );
 437                 foreach ( $res as $row ) {
 438                         if ( $row->member == $targetMember ) {
 439                                 // Found target member
 440                                 return true;
 441                         }
 442                         // Recursively search each member of the group to see if the target
 443                         // is a member of it, up to the given maximum depth.
 444                         if ( $maxDepth > 0 ) {
 445                                 if ( $this->isRoleMember( $conn, $targetMember, $row->member, $maxDepth - 1 ) ) {
 446                                         // Found member of member
 447                                         return true;
 448                                 }
 449                         }
 450                 }
 451
 452                 return false;
 453         }
 454
 455         public function preInstall() {
 456                 $createDbAccount = [
 457                         'name' => 'user',
 458                         'callback' => [ $this, 'setupUser' ],
 459                 ];
 460                 $commitCB = [
 461                         'name' => 'pg-commit',
 462                         'callback' => [ $this, 'commitChanges' ],
 463                 ];
 464                 $plpgCB = [
 465                         'name' => 'pg-plpgsql',
 466                         'callback' => [ $this, 'setupPLpgSQL' ],
 467                 ];
 468                 $schemaCB = [
 469                         'name' => 'schema',
 470                         'callback' => [ $this, 'setupSchema' ]
 471                 ];
 472
 473                 if ( $this->getVar( '_CreateDBAccount' ) ) {
 474                         $this->parent->addInstallStep( $createDbAccount, 'database' );
 475                 }
 476                 $this->parent->addInstallStep( $commitCB, 'interwiki' );
 477                 $this->parent->addInstallStep( $plpgCB, 'database' );
 478                 $this->parent->addInstallStep( $schemaCB, 'database' );
 479         }
 480
 481         function setupDatabase() {
 482                 $status = $this->getPgConnection( 'create-db' );
 483                 if ( !$status->isOK() ) {
 484                         return $status;
 485                 }
 486                 $conn = $status->value;
 487
 488                 $dbName = $this->getVar( 'wgDBname' );
 489
 490                 $exists = $conn->selectField( '"pg_catalog"."pg_database"', '1',
 491                         [ 'datname' => $dbName ], __METHOD__ );
 492                 if ( !$exists ) {
 493                         $safedb = $conn->addIdentifierQuotes( $dbName );
 494                         $conn->query( "CREATE DATABASE $safedb", __METHOD__ );
 495                 }
 496
 497                 return Status::newGood();
 498         }
 499
 500         function setupSchema() {
 501                 // Get a connection to the target database
 502                 $status = $this->getPgConnection( 'create-schema' );
 503                 if ( !$status->isOK() ) {
 504                         return $status;
 505                 }
 506                 $conn = $status->value;
 507
 508                 // Create the schema if necessary
 509                 $schema = $this->getVar( 'wgDBmwschema' );
 510                 $safeschema = $conn->addIdentifierQuotes( $schema );
 511                 $safeuser = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 512                 if ( !$conn->schemaExists( $schema ) ) {
 513                         try {
 514                                 $conn->query( "CREATE SCHEMA $safeschema AUTHORIZATION $safeuser" );
 515                         } catch ( DBQueryError $e ) {
 516                                 return Status::newFatal( 'config-install-pg-schema-failed',
 517                                         $this->getVar( '_InstallUser' ), $schema );
 518                         }
 519                 }
 520
 521                 // Select the new schema in the current connection
 522                 $conn->determineCoreSchema( $schema );
 523
 524                 return Status::newGood();
 525         }
 526
 527         function commitChanges() {
 528                 $this->db->commit( __METHOD__ );
 529
 530                 return Status::newGood();
 531         }
 532
 533         function setupUser() {
 534                 if ( !$this->getVar( '_CreateDBAccount' ) ) {
 535                         return Status::newGood();
 536                 }
 537
 538                 $status = $this->getPgConnection( 'create-db' );
 539                 if ( !$status->isOK() ) {
 540                         return $status;
 541                 }
 542                 $conn = $status->value;
 543
 544                 $safeuser = $conn->addIdentifierQuotes( $this->getVar( 'wgDBuser' ) );
 545                 $safepass = $conn->addQuotes( $this->getVar( 'wgDBpassword' ) );
 546
 547                 // Check if the user already exists
 548                 $userExists = $conn->roleExists( $this->getVar( 'wgDBuser' ) );
 549                 if ( !$userExists ) {
 550                         // Create the user
 551                         try {
 552                                 $sql = "CREATE ROLE $safeuser NOCREATEDB LOGIN PASSWORD $safepass";
 553
 554                                 // If the install user is not a superuser, we need to make the install
 555                                 // user a member of the new user's group, so that the install user will
 556                                 // be able to create a schema and other objects on behalf of the new user.
 557                                 if ( !$this->isSuperUser() ) {
 558                                         $sql .= ' ROLE' . $conn->addIdentifierQuotes( $this->getVar( '_InstallUser' ) );
 559                                 }
 560
 561                                 $conn->query( $sql, __METHOD__ );
 562                         } catch ( DBQueryError $e ) {
 563                                 return Status::newFatal( 'config-install-user-create-failed',
 564                                         $this->getVar( 'wgDBuser' ), $e->getMessage() );
 565                         }
 566                 }
 567
 568                 return Status::newGood();
 569         }
 570
 571         function getLocalSettings() {
 572                 $port = $this->getVar( 'wgDBport' );
 573                 $schema = $this->getVar( 'wgDBmwschema' );
 574
 575                 return "# Postgres specific settings
 576 \$wgDBport = \"{$port}\";
 577 \$wgDBmwschema = \"{$schema}\";";
 578         }
 579
 580         public function preUpgrade() {
 581                 global $wgDBuser, $wgDBpassword;
 582
 583                 # Normal user and password are selected after this step, so for now
 584                 # just copy these two
 585                 $wgDBuser = $this->getVar( '_InstallUser' );
 586                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 587         }
 588
 589         public function createTables() {
 590                 $schema = $this->getVar( 'wgDBmwschema' );
 591
 592                 $status = $this->getConnection();
 593                 if ( !$status->isOK() ) {
 594                         return $status;
 595                 }
 596
 597                 /** @var DatabasePostgres $conn */
 598                 $conn = $status->value;
 599
 600                 if ( $conn->tableExists( 'archive' ) ) {
 601                         $status->warning( 'config-install-tables-exist' );
 602                         $this->enableLB();
 603
 604                         return $status;
 605                 }
 606
 607                 $conn->begin( __METHOD__ );
 608
 609                 if ( !$conn->schemaExists( $schema ) ) {
 610                         $status->fatal( 'config-install-pg-schema-not-exist' );
 611
 612                         return $status;
 613                 }
 614                 $error = $conn->sourceFile( $this->getSchemaPath( $conn ) );
 615                 if ( $error !== true ) {
 616                         $conn->reportQueryError( $error, 0, '', __METHOD__ );
 617                         $conn->rollback( __METHOD__ );
 618                         $status->fatal( 'config-install-tables-failed', $error );
 619                 } else {
 620                         $conn->commit( __METHOD__ );
 621                 }
 622                 // Resume normal operations
 623                 if ( $status->isOK() ) {
 624                         $this->enableLB();
 625                 }
 626
 627                 return $status;
 628         }
 629
 630         public function getGlobalDefaults() {
 631                 // The default $wgDBmwschema is null, which breaks Postgres and other DBMSes that require
 632                 // the use of a schema, so we need to set it here
 633                 return array_merge( parent::getGlobalDefaults(), [
 634                         'wgDBmwschema' => 'mediawiki',
 635                 ] );
 636         }
 637
 638         public function setupPLpgSQL() {
 639                 // Connect as the install user, since it owns the database and so is
 640                 // the user that needs to run "CREATE LANGAUGE"
 641                 $status = $this->getPgConnection( 'create-schema' );
 642                 if ( !$status->isOK() ) {
 643                         return $status;
 644                 }
 645                 /**
 646                  * @var $conn Database
 647                  */
 648                 $conn = $status->value;
 649
 650                 $exists = $conn->selectField( '"pg_catalog"."pg_language"', 1,
 651                         [ 'lanname' => 'plpgsql' ], __METHOD__ );
 652                 if ( $exists ) {
 653                         // Already exists, nothing to do
 654                         return Status::newGood();
 655                 }
 656
 657                 // plpgsql is not installed, but if we have a pg_pltemplate table, we
 658                 // should be able to create it
 659                 $exists = $conn->selectField(
 660                         [ '"pg_catalog"."pg_class"', '"pg_catalog"."pg_namespace"' ],
 661                         1,
 662                         [
 663                                 'pg_namespace.oid=relnamespace',
 664                                 'nspname' => 'pg_catalog',
 665                                 'relname' => 'pg_pltemplate',
 666                         ],
 667                         __METHOD__ );
 668                 if ( $exists ) {
 669                         try {
 670                                 $conn->query( 'CREATE LANGUAGE plpgsql' );
 671                         } catch ( DBQueryError $e ) {
 672                                 return Status::newFatal( 'config-pg-no-plpgsql', $this->getVar( 'wgDBname' ) );
 673                         }
 674                 } else {
 675                         return Status::newFatal( 'config-pg-no-plpgsql', $this->getVar( 'wgDBname' ) );
 676                 }
 677
 678                 return Status::newGood();
 679         }
 680 }