includes/installer/MysqlInstaller.php

   1 <?php
   2 /**
   3  * MySQL-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 /**
  25  * Class for setting up the MediaWiki database using MySQL.
  26  *
  27  * @ingroup Deployment
  28  * @since 1.17
  29  */
  30 class MysqlInstaller extends DatabaseInstaller {
  31
  32         protected $globalNames = array(
  33                 'wgDBserver',
  34                 'wgDBname',
  35                 'wgDBuser',
  36                 'wgDBpassword',
  37                 'wgDBprefix',
  38                 'wgDBTableOptions',
  39                 'wgDBmysql5',
  40         );
  41
  42         protected $internalDefaults = array(
  43                 '_MysqlEngine' => 'InnoDB',
  44                 '_MysqlCharset' => 'binary',
  45                 '_InstallUser' => 'root',
  46         );
  47
  48         public $supportedEngines = array( 'InnoDB', 'MyISAM' );
  49
  50         public $minimumVersion = '5.0.2';
  51
  52         public $webUserPrivs = array(
  53                 'DELETE',
  54                 'INSERT',
  55                 'SELECT',
  56                 'UPDATE',
  57                 'CREATE TEMPORARY TABLES',
  58         );
  59
  60         /**
  61          * @return string
  62          */
  63         public function getName() {
  64                 return 'mysql';
  65         }
  66
  67         /**
  68          * @return bool
  69          */
  70         public function isCompiled() {
  71                 return self::checkExtension( 'mysql' ) || self::checkExtension( 'mysqli' );
  72         }
  73
  74         /**
  75          * @return array
  76          */
  77         public function getGlobalDefaults() {
  78                 return array();
  79         }
  80
  81         /**
  82          * @return string
  83          */
  84         public function getConnectForm() {
  85                 return $this->getTextBox(
  86                         'wgDBserver',
  87                         'config-db-host',
  88                         array(),
  89                         $this->parent->getHelpBox( 'config-db-host-help' )
  90                 ) .
  91                         Html::openElement( 'fieldset' ) .
  92                         Html::element( 'legend', array(), wfMessage( 'config-db-wiki-settings' )->text() ) .
  93                         $this->getTextBox( 'wgDBname', 'config-db-name', array( 'dir' => 'ltr' ),
  94                                 $this->parent->getHelpBox( 'config-db-name-help' ) ) .
  95                         $this->getTextBox( 'wgDBprefix', 'config-db-prefix', array( 'dir' => 'ltr' ),
  96                                 $this->parent->getHelpBox( 'config-db-prefix-help' ) ) .
  97                         Html::closeElement( 'fieldset' ) .
  98                         $this->getInstallUserBox();
  99         }
 100
 101         public function submitConnectForm() {
 102                 // Get variables from the request.
 103                 $newValues = $this->setVarsFromRequest( array(
 104                         'wgDBserver', 'wgDBname', 'wgDBprefix', '_InstallUser', '_InstallPassword'
 105                 ) );
 106
 107                 // Validate them.
 108                 $status = Status::newGood();
 109                 if ( !strlen( $newValues['wgDBserver'] ) ) {
 110                         $status->fatal( 'config-missing-db-host' );
 111                 }
 112                 if ( !strlen( $newValues['wgDBname'] ) ) {
 113                         $status->fatal( 'config-missing-db-name' );
 114                 } elseif ( !preg_match( '/^[a-z0-9+_-]+$/i', $newValues['wgDBname'] ) ) {
 115                         $status->fatal( 'config-invalid-db-name', $newValues['wgDBname'] );
 116                 }
 117                 if ( !preg_match( '/^[a-z0-9_-]*$/i', $newValues['wgDBprefix'] ) ) {
 118                         $status->fatal( 'config-invalid-db-prefix', $newValues['wgDBprefix'] );
 119                 }
 120                 if ( !strlen( $newValues['_InstallUser'] ) ) {
 121                         $status->fatal( 'config-db-username-empty' );
 122                 }
 123                 if ( !strlen( $newValues['_InstallPassword'] ) ) {
 124                         $status->fatal( 'config-db-password-empty', $newValues['_InstallUser'] );
 125                 }
 126                 if ( !$status->isOK() ) {
 127                         return $status;
 128                 }
 129
 130                 // Submit user box
 131                 $status = $this->submitInstallUserBox();
 132                 if ( !$status->isOK() ) {
 133                         return $status;
 134                 }
 135
 136                 // Try to connect
 137                 $status = $this->getConnection();
 138                 if ( !$status->isOK() ) {
 139                         return $status;
 140                 }
 141                 /**
 142                  * @var $conn DatabaseBase
 143                  */
 144                 $conn = $status->value;
 145
 146                 // Check version
 147                 $version = $conn->getServerVersion();
 148                 if ( version_compare( $version, $this->minimumVersion ) < 0 ) {
 149                         return Status::newFatal( 'config-mysql-old', $this->minimumVersion, $version );
 150                 }
 151
 152                 return $status;
 153         }
 154
 155         /**
 156          * @return Status
 157          */
 158         public function openConnection() {
 159                 $status = Status::newGood();
 160                 try {
 161                         $db = DatabaseBase::factory( 'mysql', array(
 162                                 'host' => $this->getVar( 'wgDBserver' ),
 163                                 'user' => $this->getVar( '_InstallUser' ),
 164                                 'password' => $this->getVar( '_InstallPassword' ),
 165                                 'dbname' => false,
 166                                 'flags' => 0,
 167                                 'tablePrefix' => $this->getVar( 'wgDBprefix' ) ) );
 168                         $status->value = $db;
 169                 } catch ( DBConnectionError $e ) {
 170                         $status->fatal( 'config-connection-error', $e->getMessage() );
 171                 }
 172
 173                 return $status;
 174         }
 175
 176         public function preUpgrade() {
 177                 global $wgDBuser, $wgDBpassword;
 178
 179                 $status = $this->getConnection();
 180                 if ( !$status->isOK() ) {
 181                         $this->parent->showStatusError( $status );
 182
 183                         return;
 184                 }
 185                 /**
 186                  * @var $conn DatabaseBase
 187                  */
 188                 $conn = $status->value;
 189                 $conn->selectDB( $this->getVar( 'wgDBname' ) );
 190
 191                 # Determine existing default character set
 192                 if ( $conn->tableExists( "revision", __METHOD__ ) ) {
 193                         $revision = $conn->buildLike( $this->getVar( 'wgDBprefix' ) . 'revision' );
 194                         $res = $conn->query( "SHOW TABLE STATUS $revision", __METHOD__ );
 195                         $row = $conn->fetchObject( $res );
 196                         if ( !$row ) {
 197                                 $this->parent->showMessage( 'config-show-table-status' );
 198                                 $existingSchema = false;
 199                                 $existingEngine = false;
 200                         } else {
 201                                 if ( preg_match( '/^latin1/', $row->Collation ) ) {
 202                                         $existingSchema = 'latin1';
 203                                 } elseif ( preg_match( '/^utf8/', $row->Collation ) ) {
 204                                         $existingSchema = 'utf8';
 205                                 } elseif ( preg_match( '/^binary/', $row->Collation ) ) {
 206                                         $existingSchema = 'binary';
 207                                 } else {
 208                                         $existingSchema = false;
 209                                         $this->parent->showMessage( 'config-unknown-collation' );
 210                                 }
 211                                 if ( isset( $row->Engine ) ) {
 212                                         $existingEngine = $row->Engine;
 213                                 } else {
 214                                         $existingEngine = $row->Type;
 215                                 }
 216                         }
 217                 } else {
 218                         $existingSchema = false;
 219                         $existingEngine = false;
 220                 }
 221
 222                 if ( $existingSchema && $existingSchema != $this->getVar( '_MysqlCharset' ) ) {
 223                         $this->setVar( '_MysqlCharset', $existingSchema );
 224                 }
 225                 if ( $existingEngine && $existingEngine != $this->getVar( '_MysqlEngine' ) ) {
 226                         $this->setVar( '_MysqlEngine', $existingEngine );
 227                 }
 228
 229                 # Normal user and password are selected after this step, so for now
 230                 # just copy these two
 231                 $wgDBuser = $this->getVar( '_InstallUser' );
 232                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 233         }
 234
 235         /**
 236          * Get a list of storage engines that are available and supported
 237          *
 238          * @return array
 239          */
 240         public function getEngines() {
 241                 $status = $this->getConnection();
 242
 243                 /**
 244                  * @var $conn DatabaseBase
 245                  */
 246                 $conn = $status->value;
 247
 248                 $engines = array();
 249                 $res = $conn->query( 'SHOW ENGINES', __METHOD__ );
 250                 foreach ( $res as $row ) {
 251                         if ( $row->Support == 'YES' || $row->Support == 'DEFAULT' ) {
 252                                 $engines[] = $row->Engine;
 253                         }
 254                 }
 255                 $engines = array_intersect( $this->supportedEngines, $engines );
 256
 257                 return $engines;
 258         }
 259
 260         /**
 261          * Get a list of character sets that are available and supported
 262          *
 263          * @return array
 264          */
 265         public function getCharsets() {
 266                 return array( 'binary', 'utf8' );
 267         }
 268
 269         /**
 270          * Return true if the install user can create accounts
 271          *
 272          * @return bool
 273          */
 274         public function canCreateAccounts() {
 275                 $status = $this->getConnection();
 276                 if ( !$status->isOK() ) {
 277                         return false;
 278                 }
 279                 /** @var $conn DatabaseBase */
 280                 $conn = $status->value;
 281
 282                 // Get current account name
 283                 $currentName = $conn->selectField( '', 'CURRENT_USER()', '', __METHOD__ );
 284                 $parts = explode( '@', $currentName );
 285                 if ( count( $parts ) != 2 ) {
 286                         return false;
 287                 }
 288                 $quotedUser = $conn->addQuotes( $parts[0] ) .
 289                         '@' . $conn->addQuotes( $parts[1] );
 290
 291                 // The user needs to have INSERT on mysql.* to be able to CREATE USER
 292                 // The grantee will be double-quoted in this query, as required
 293                 $res = $conn->select( 'INFORMATION_SCHEMA.USER_PRIVILEGES', '*',
 294                         array( 'GRANTEE' => $quotedUser ), __METHOD__ );
 295                 $insertMysql = false;
 296                 $grantOptions = array_flip( $this->webUserPrivs );
 297                 foreach ( $res as $row ) {
 298                         if ( $row->PRIVILEGE_TYPE == 'INSERT' ) {
 299                                 $insertMysql = true;
 300                         }
 301                         if ( $row->IS_GRANTABLE ) {
 302                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 303                         }
 304                 }
 305
 306                 // Check for DB-specific privs for mysql.*
 307                 if ( !$insertMysql ) {
 308                         $row = $conn->selectRow( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 309                                 array(
 310                                         'GRANTEE' => $quotedUser,
 311                                         'TABLE_SCHEMA' => 'mysql',
 312                                         'PRIVILEGE_TYPE' => 'INSERT',
 313                                 ), __METHOD__ );
 314                         if ( $row ) {
 315                                 $insertMysql = true;
 316                         }
 317                 }
 318
 319                 if ( !$insertMysql ) {
 320                         return false;
 321                 }
 322
 323                 // Check for DB-level grant options
 324                 $res = $conn->select( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 325                         array(
 326                                 'GRANTEE' => $quotedUser,
 327                                 'IS_GRANTABLE' => 1,
 328                         ), __METHOD__ );
 329                 foreach ( $res as $row ) {
 330                         $regex = $conn->likeToRegex( $row->TABLE_SCHEMA );
 331                         if ( preg_match( $regex, $this->getVar( 'wgDBname' ) ) ) {
 332                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 333                         }
 334                 }
 335                 if ( count( $grantOptions ) ) {
 336                         // Can't grant everything
 337                         return false;
 338                 }
 339
 340                 return true;
 341         }
 342
 343         /**
 344          * @return string
 345          */
 346         public function getSettingsForm() {
 347                 if ( $this->canCreateAccounts() ) {
 348                         $noCreateMsg = false;
 349                 } else {
 350                         $noCreateMsg = 'config-db-web-no-create-privs';
 351                 }
 352                 $s = $this->getWebUserBox( $noCreateMsg );
 353
 354                 // Do engine selector
 355                 $engines = $this->getEngines();
 356                 // If the current default engine is not supported, use an engine that is
 357                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 358                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 359                 }
 360
 361                 $s .= Xml::openElement( 'div', array(
 362                         'id' => 'dbMyisamWarning'
 363                 ) );
 364                 $myisamWarning = 'config-mysql-myisam-dep';
 365                 if ( count( $engines ) === 1 ) {
 366                         $myisamWarning = 'config-mysql-only-myisam-dep';
 367                 }
 368                 $s .= $this->parent->getWarningBox( wfMessage( $myisamWarning )->text() );
 369                 $s .= Xml::closeElement( 'div' );
 370
 371                 if ( $this->getVar( '_MysqlEngine' ) != 'MyISAM' ) {
 372                         $s .= Xml::openElement( 'script', array( 'type' => 'text/javascript' ) );
 373                         $s .= '$(\'#dbMyisamWarning\').hide();';
 374                         $s .= Xml::closeElement( 'script' );
 375                 }
 376
 377                 if ( count( $engines ) >= 2 ) {
 378                         // getRadioSet() builds a set of labeled radio buttons.
 379                         // For grep: The following messages are used as the item labels:
 380                         // config-mysql-innodb, config-mysql-myisam
 381                         $s .= $this->getRadioSet( array(
 382                                 'var' => '_MysqlEngine',
 383                                 'label' => 'config-mysql-engine',
 384                                 'itemLabelPrefix' => 'config-mysql-',
 385                                 'values' => $engines,
 386                                 'itemAttribs' => array(
 387                                         'MyISAM' => array(
 388                                                 'class' => 'showHideRadio',
 389                                                 'rel' => 'dbMyisamWarning'
 390                                         ),
 391                                         'InnoDB' => array(
 392                                                 'class' => 'hideShowRadio',
 393                                                 'rel' => 'dbMyisamWarning'
 394                                         )
 395                                 )
 396                         ) );
 397                         $s .= $this->parent->getHelpBox( 'config-mysql-engine-help' );
 398                 }
 399
 400                 // If the current default charset is not supported, use a charset that is
 401                 $charsets = $this->getCharsets();
 402                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 403                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 404                 }
 405
 406                 // Do charset selector
 407                 if ( count( $charsets ) >= 2 ) {
 408                         // getRadioSet() builds a set of labeled radio buttons.
 409                         // For grep: The following messages are used as the item labels:
 410                         // config-mysql-binary, config-mysql-utf8
 411                         $s .= $this->getRadioSet( array(
 412                                 'var' => '_MysqlCharset',
 413                                 'label' => 'config-mysql-charset',
 414                                 'itemLabelPrefix' => 'config-mysql-',
 415                                 'values' => $charsets
 416                         ) );
 417                         $s .= $this->parent->getHelpBox( 'config-mysql-charset-help' );
 418                 }
 419
 420                 return $s;
 421         }
 422
 423         /**
 424          * @return Status
 425          */
 426         public function submitSettingsForm() {
 427                 $this->setVarsFromRequest( array( '_MysqlEngine', '_MysqlCharset' ) );
 428                 $status = $this->submitWebUserBox();
 429                 if ( !$status->isOK() ) {
 430                         return $status;
 431                 }
 432
 433                 // Validate the create checkbox
 434                 $canCreate = $this->canCreateAccounts();
 435                 if ( !$canCreate ) {
 436                         $this->setVar( '_CreateDBAccount', false );
 437                         $create = false;
 438                 } else {
 439                         $create = $this->getVar( '_CreateDBAccount' );
 440                 }
 441
 442                 if ( !$create ) {
 443                         // Test the web account
 444                         try {
 445                                 DatabaseBase::factory( 'mysql', array(
 446                                         'host' => $this->getVar( 'wgDBserver' ),
 447                                         'user' => $this->getVar( 'wgDBuser' ),
 448                                         'password' => $this->getVar( 'wgDBpassword' ),
 449                                         'dbname' => false,
 450                                         'flags' => 0,
 451                                         'tablePrefix' => $this->getVar( 'wgDBprefix' )
 452                                 ) );
 453                         } catch ( DBConnectionError $e ) {
 454                                 return Status::newFatal( 'config-connection-error', $e->getMessage() );
 455                         }
 456                 }
 457
 458                 // Validate engines and charsets
 459                 // This is done pre-submit already so it's just for security
 460                 $engines = $this->getEngines();
 461                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 462                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 463                 }
 464                 $charsets = $this->getCharsets();
 465                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 466                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 467                 }
 468
 469                 return Status::newGood();
 470         }
 471
 472         public function preInstall() {
 473                 # Add our user callback to installSteps, right before the tables are created.
 474                 $callback = array(
 475                         'name' => 'user',
 476                         'callback' => array( $this, 'setupUser' ),
 477                 );
 478                 $this->parent->addInstallStep( $callback, 'tables' );
 479         }
 480
 481         /**
 482          * @return Status
 483          */
 484         public function setupDatabase() {
 485                 $status = $this->getConnection();
 486                 if ( !$status->isOK() ) {
 487                         return $status;
 488                 }
 489                 /** @var DatabaseBase $conn */
 490                 $conn = $status->value;
 491                 $dbName = $this->getVar( 'wgDBname' );
 492                 if ( !$conn->selectDB( $dbName ) ) {
 493                         $conn->query(
 494                                 "CREATE DATABASE " . $conn->addIdentifierQuotes( $dbName ) . "CHARACTER SET utf8",
 495                                 __METHOD__
 496                         );
 497                         $conn->selectDB( $dbName );
 498                 }
 499                 $this->setupSchemaVars();
 500
 501                 return $status;
 502         }
 503
 504         /**
 505          * @return Status
 506          */
 507         public function setupUser() {
 508                 $dbUser = $this->getVar( 'wgDBuser' );
 509                 if ( $dbUser == $this->getVar( '_InstallUser' ) ) {
 510                         return Status::newGood();
 511                 }
 512                 $status = $this->getConnection();
 513                 if ( !$status->isOK() ) {
 514                         return $status;
 515                 }
 516
 517                 $this->setupSchemaVars();
 518                 $dbName = $this->getVar( 'wgDBname' );
 519                 $this->db->selectDB( $dbName );
 520                 $server = $this->getVar( 'wgDBserver' );
 521                 $password = $this->getVar( 'wgDBpassword' );
 522                 $grantableNames = array();
 523
 524                 if ( $this->getVar( '_CreateDBAccount' ) ) {
 525                         // Before we blindly try to create a user that already has access,
 526                         try { // first attempt to connect to the database
 527                                 DatabaseBase::factory( 'mysql', array(
 528                                         'host' => $server,
 529                                         'user' => $dbUser,
 530                                         'password' => $password,
 531                                         'dbname' => false,
 532                                         'flags' => 0,
 533                                         'tablePrefix' => $this->getVar( 'wgDBprefix' )
 534                                 ) );
 535                                 $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 536                                 $tryToCreate = false;
 537                         } catch ( DBConnectionError $e ) {
 538                                 $tryToCreate = true;
 539                         }
 540                 } else {
 541                         $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 542                         $tryToCreate = false;
 543                 }
 544
 545                 if ( $tryToCreate ) {
 546                         $createHostList = array(
 547                                 $server,
 548                                 'localhost',
 549                                 'localhost.localdomain',
 550                                 '%'
 551                         );
 552
 553                         $createHostList = array_unique( $createHostList );
 554                         $escPass = $this->db->addQuotes( $password );
 555
 556                         foreach ( $createHostList as $host ) {
 557                                 $fullName = $this->buildFullUserName( $dbUser, $host );
 558                                 if ( !$this->userDefinitelyExists( $dbUser, $host ) ) {
 559                                         try {
 560                                                 $this->db->begin( __METHOD__ );
 561                                                 $this->db->query( "CREATE USER $fullName IDENTIFIED BY $escPass", __METHOD__ );
 562                                                 $this->db->commit( __METHOD__ );
 563                                                 $grantableNames[] = $fullName;
 564                                         } catch ( DBQueryError $dqe ) {
 565                                                 if ( $this->db->lastErrno() == 1396 /* ER_CANNOT_USER */ ) {
 566                                                         // User (probably) already exists
 567                                                         $this->db->rollback( __METHOD__ );
 568                                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 569                                                         $grantableNames[] = $fullName;
 570                                                         break;
 571                                                 } else {
 572                                                         // If we couldn't create for some bizzare reason and the
 573                                                         // user probably doesn't exist, skip the grant
 574                                                         $this->db->rollback( __METHOD__ );
 575                                                         $status->warning( 'config-install-user-create-failed', $dbUser, $dqe->getText() );
 576                                                 }
 577                                         }
 578                                 } else {
 579                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 580                                         $grantableNames[] = $fullName;
 581                                         break;
 582                                 }
 583                         }
 584                 }
 585
 586                 // Try to grant to all the users we know exist or we were able to create
 587                 $dbAllTables = $this->db->addIdentifierQuotes( $dbName ) . '.*';
 588                 foreach ( $grantableNames as $name ) {
 589                         try {
 590                                 $this->db->begin( __METHOD__ );
 591                                 $this->db->query( "GRANT ALL PRIVILEGES ON $dbAllTables TO $name", __METHOD__ );
 592                                 $this->db->commit( __METHOD__ );
 593                         } catch ( DBQueryError $dqe ) {
 594                                 $this->db->rollback( __METHOD__ );
 595                                 $status->fatal( 'config-install-user-grant-failed', $dbUser, $dqe->getText() );
 596                         }
 597                 }
 598
 599                 return $status;
 600         }
 601
 602         /**
 603          * Return a formal 'User'@'Host' username for use in queries
 604          * @param string $name Username, quotes will be added
 605          * @param string $host Hostname, quotes will be added
 606          * @return string
 607          */
 608         private function buildFullUserName( $name, $host ) {
 609                 return $this->db->addQuotes( $name ) . '@' . $this->db->addQuotes( $host );
 610         }
 611
 612         /**
 613          * Try to see if the user account exists. Our "superuser" may not have
 614          * access to mysql.user, so false means "no" or "maybe"
 615          * @param string $host Hostname to check
 616          * @param string $user Username to check
 617          * @return bool
 618          */
 619         private function userDefinitelyExists( $host, $user ) {
 620                 try {
 621                         $res = $this->db->selectRow( 'mysql.user', array( 'Host', 'User' ),
 622                                 array( 'Host' => $host, 'User' => $user ), __METHOD__ );
 623
 624                         return (bool)$res;
 625                 } catch ( DBQueryError $dqe ) {
 626                         return false;
 627                 }
 628         }
 629
 630         /**
 631          * Return any table options to be applied to all tables that don't
 632          * override them.
 633          *
 634          * @return string
 635          */
 636         protected function getTableOptions() {
 637                 $options = array();
 638                 if ( $this->getVar( '_MysqlEngine' ) !== null ) {
 639                         $options[] = "ENGINE=" . $this->getVar( '_MysqlEngine' );
 640                 }
 641                 if ( $this->getVar( '_MysqlCharset' ) !== null ) {
 642                         $options[] = 'DEFAULT CHARSET=' . $this->getVar( '_MysqlCharset' );
 643                 }
 644
 645                 return implode( ', ', $options );
 646         }
 647
 648         /**
 649          * Get variables to substitute into tables.sql and the SQL patch files.
 650          *
 651          * @return array
 652          */
 653         public function getSchemaVars() {
 654                 return array(
 655                         'wgDBTableOptions' => $this->getTableOptions(),
 656                         'wgDBname' => $this->getVar( 'wgDBname' ),
 657                         'wgDBuser' => $this->getVar( 'wgDBuser' ),
 658                         'wgDBpassword' => $this->getVar( 'wgDBpassword' ),
 659                 );
 660         }
 661
 662         public function getLocalSettings() {
 663                 $dbmysql5 = wfBoolToStr( $this->getVar( 'wgDBmysql5', true ) );
 664                 $prefix = LocalSettingsGenerator::escapePhpString( $this->getVar( 'wgDBprefix' ) );
 665                 $tblOpts = LocalSettingsGenerator::escapePhpString( $this->getTableOptions() );
 666
 667                 return "# MySQL specific settings
 668 \$wgDBprefix = \"{$prefix}\";
 669
 670 # MySQL table options to use during installation or update
 671 \$wgDBTableOptions = \"{$tblOpts}\";
 672
 673 # Experimental charset support for MySQL 5.0.
 674 \$wgDBmysql5 = {$dbmysql5};";
 675         }
 676 }