includes/installer/DatabaseUpdater.php

   1 <?php
   2 /**
   3  * DBMS-specific updater helper.
   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 require_once __DIR__ . '/../../maintenance/Maintenance.php';
  25
  26 /**
  27  * Class for handling database updates. Roughly based off of updaters.inc, with
  28  * a few improvements :)
  29  *
  30  * @ingroup Deployment
  31  * @since 1.17
  32  */
  33 abstract class DatabaseUpdater {
  34         protected static $updateCounter = 0;
  35
  36         /**
  37          * Array of updates to perform on the database
  38          *
  39          * @var array
  40          */
  41         protected $updates = [];
  42
  43         /**
  44          * Array of updates that were skipped
  45          *
  46          * @var array
  47          */
  48         protected $updatesSkipped = [];
  49
  50         /**
  51          * List of extension-provided database updates
  52          * @var array
  53          */
  54         protected $extensionUpdates = [];
  55
  56         /**
  57          * Handle to the database subclass
  58          *
  59          * @var DatabaseBase
  60          */
  61         protected $db;
  62
  63         protected $shared = false;
  64
  65         /**
  66          * @var string[] Scripts to run after database update
  67          * Should be a subclass of LoggedUpdateMaintenance
  68          */
  69         protected $postDatabaseUpdateMaintenance = [
  70                 DeleteDefaultMessages::class,
  71                 PopulateRevisionLength::class,
  72                 PopulateRevisionSha1::class,
  73                 PopulateImageSha1::class,
  74                 FixExtLinksProtocolRelative::class,
  75                 PopulateFilearchiveSha1::class,
  76                 PopulateBacklinkNamespace::class,
  77                 FixDefaultJsonContentPages::class,
  78                 CleanupEmptyCategories::class,
  79         ];
  80
  81         /**
  82          * File handle for SQL output.
  83          *
  84          * @var resource
  85          */
  86         protected $fileHandle = null;
  87
  88         /**
  89          * Flag specifying whether or not to skip schema (e.g. SQL-only) updates.
  90          *
  91          * @var bool
  92          */
  93         protected $skipSchema = false;
  94
  95         /**
  96          * Hold the value of $wgContentHandlerUseDB during the upgrade.
  97          */
  98         protected $holdContentHandlerUseDB = true;
  99
 100         /**
 101          * Constructor
 102          *
 103          * @param DatabaseBase $db To perform updates on
 104          * @param bool $shared Whether to perform updates on shared tables
 105          * @param Maintenance $maintenance Maintenance object which created us
 106          */
 107         protected function __construct( DatabaseBase &$db, $shared, Maintenance $maintenance = null ) {
 108                 $this->db = $db;
 109                 $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
 110                 $this->shared = $shared;
 111                 if ( $maintenance ) {
 112                         $this->maintenance = $maintenance;
 113                         $this->fileHandle = $maintenance->fileHandle;
 114                 } else {
 115                         $this->maintenance = new FakeMaintenance;
 116                 }
 117                 $this->maintenance->setDB( $db );
 118                 $this->initOldGlobals();
 119                 $this->loadExtensions();
 120                 Hooks::run( 'LoadExtensionSchemaUpdates', [ $this ] );
 121         }
 122
 123         /**
 124          * Initialize all of the old globals. One day this should all become
 125          * something much nicer
 126          */
 127         private function initOldGlobals() {
 128                 global $wgExtNewTables, $wgExtNewFields, $wgExtPGNewFields,
 129                         $wgExtPGAlteredFields, $wgExtNewIndexes, $wgExtModifiedFields;
 130
 131                 # For extensions only, should be populated via hooks
 132                 # $wgDBtype should be checked to specifiy the proper file
 133                 $wgExtNewTables = []; // table, dir
 134                 $wgExtNewFields = []; // table, column, dir
 135                 $wgExtPGNewFields = []; // table, column, column attributes; for PostgreSQL
 136                 $wgExtPGAlteredFields = []; // table, column, new type, conversion method; for PostgreSQL
 137                 $wgExtNewIndexes = []; // table, index, dir
 138                 $wgExtModifiedFields = []; // table, index, dir
 139         }
 140
 141         /**
 142          * Loads LocalSettings.php, if needed, and initialises everything needed for
 143          * LoadExtensionSchemaUpdates hook.
 144          */
 145         private function loadExtensions() {
 146                 if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
 147                         return; // already loaded
 148                 }
 149                 $vars = Installer::getExistingLocalSettings();
 150
 151                 $registry = ExtensionRegistry::getInstance();
 152                 $queue = $registry->getQueue();
 153                 // Don't accidentally load extensions in the future
 154                 $registry->clearQueue();
 155
 156                 // This will automatically add "AutoloadClasses" to $wgAutoloadClasses
 157                 $data = $registry->readFromQueue( $queue );
 158                 $hooks = [ 'wgHooks' => [ 'LoadExtensionSchemaUpdates' => [] ] ];
 159                 if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
 160                         $hooks = $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'];
 161                 }
 162                 if ( $vars && isset( $vars['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
 163                         $hooks = array_merge_recursive( $hooks, $vars['wgHooks']['LoadExtensionSchemaUpdates'] );
 164                 }
 165                 global $wgHooks, $wgAutoloadClasses;
 166                 $wgHooks['LoadExtensionSchemaUpdates'] = $hooks;
 167                 if ( $vars && isset( $vars['wgAutoloadClasses'] ) ) {
 168                         $wgAutoloadClasses += $vars['wgAutoloadClasses'];
 169                 }
 170         }
 171
 172         /**
 173          * @param DatabaseBase $db
 174          * @param bool $shared
 175          * @param Maintenance $maintenance
 176          *
 177          * @throws MWException
 178          * @return DatabaseUpdater
 179          */
 180         public static function newForDB( &$db, $shared = false, $maintenance = null ) {
 181                 $type = $db->getType();
 182                 if ( in_array( $type, Installer::getDBTypes() ) ) {
 183                         $class = ucfirst( $type ) . 'Updater';
 184
 185                         return new $class( $db, $shared, $maintenance );
 186                 } else {
 187                         throw new MWException( __METHOD__ . ' called for unsupported $wgDBtype' );
 188                 }
 189         }
 190
 191         /**
 192          * Get a database connection to run updates
 193          *
 194          * @return DatabaseBase
 195          */
 196         public function getDB() {
 197                 return $this->db;
 198         }
 199
 200         /**
 201          * Output some text. If we're running from web, escape the text first.
 202          *
 203          * @param string $str Text to output
 204          */
 205         public function output( $str ) {
 206                 if ( $this->maintenance->isQuiet() ) {
 207                         return;
 208                 }
 209                 global $wgCommandLineMode;
 210                 if ( !$wgCommandLineMode ) {
 211                         $str = htmlspecialchars( $str );
 212                 }
 213                 echo $str;
 214                 flush();
 215         }
 216
 217         /**
 218          * Add a new update coming from an extension. This should be called by
 219          * extensions while executing the LoadExtensionSchemaUpdates hook.
 220          *
 221          * @since 1.17
 222          *
 223          * @param array $update The update to run. Format is the following:
 224          *                first item is the callback function, it also can be a
 225          *                simple string with the name of a function in this class,
 226          *                following elements are parameters to the function.
 227          *                Note that callback functions will receive this object as
 228          *                first parameter.
 229          */
 230         public function addExtensionUpdate( array $update ) {
 231                 $this->extensionUpdates[] = $update;
 232         }
 233
 234         /**
 235          * Convenience wrapper for addExtensionUpdate() when adding a new table (which
 236          * is the most common usage of updaters in an extension)
 237          *
 238          * @since 1.18
 239          *
 240          * @param string $tableName Name of table to create
 241          * @param string $sqlPath Full path to the schema file
 242          */
 243         public function addExtensionTable( $tableName, $sqlPath ) {
 244                 $this->extensionUpdates[] = [ 'addTable', $tableName, $sqlPath, true ];
 245         }
 246
 247         /**
 248          * @since 1.19
 249          *
 250          * @param string $tableName
 251          * @param string $indexName
 252          * @param string $sqlPath
 253          */
 254         public function addExtensionIndex( $tableName, $indexName, $sqlPath ) {
 255                 $this->extensionUpdates[] = [ 'addIndex', $tableName, $indexName, $sqlPath, true ];
 256         }
 257
 258         /**
 259          *
 260          * @since 1.19
 261          *
 262          * @param string $tableName
 263          * @param string $columnName
 264          * @param string $sqlPath
 265          */
 266         public function addExtensionField( $tableName, $columnName, $sqlPath ) {
 267                 $this->extensionUpdates[] = [ 'addField', $tableName, $columnName, $sqlPath, true ];
 268         }
 269
 270         /**
 271          *
 272          * @since 1.20
 273          *
 274          * @param string $tableName
 275          * @param string $columnName
 276          * @param string $sqlPath
 277          */
 278         public function dropExtensionField( $tableName, $columnName, $sqlPath ) {
 279                 $this->extensionUpdates[] = [ 'dropField', $tableName, $columnName, $sqlPath, true ];
 280         }
 281
 282         /**
 283          * Drop an index from an extension table
 284          *
 285          * @since 1.21
 286          *
 287          * @param string $tableName The table name
 288          * @param string $indexName The index name
 289          * @param string $sqlPath The path to the SQL change path
 290          */
 291         public function dropExtensionIndex( $tableName, $indexName, $sqlPath ) {
 292                 $this->extensionUpdates[] = [ 'dropIndex', $tableName, $indexName, $sqlPath, true ];
 293         }
 294
 295         /**
 296          *
 297          * @since 1.20
 298          *
 299          * @param string $tableName
 300          * @param string $sqlPath
 301          */
 302         public function dropExtensionTable( $tableName, $sqlPath ) {
 303                 $this->extensionUpdates[] = [ 'dropTable', $tableName, $sqlPath, true ];
 304         }
 305
 306         /**
 307          * Rename an index on an extension table
 308          *
 309          * @since 1.21
 310          *
 311          * @param string $tableName The table name
 312          * @param string $oldIndexName The old index name
 313          * @param string $newIndexName The new index name
 314          * @param string $sqlPath The path to the SQL change path
 315          * @param bool $skipBothIndexExistWarning Whether to warn if both the old
 316          * and the new indexes exist. [facultative; by default, false]
 317          */
 318         public function renameExtensionIndex( $tableName, $oldIndexName, $newIndexName,
 319                 $sqlPath, $skipBothIndexExistWarning = false
 320         ) {
 321                 $this->extensionUpdates[] = [
 322                         'renameIndex',
 323                         $tableName,
 324                         $oldIndexName,
 325                         $newIndexName,
 326                         $skipBothIndexExistWarning,
 327                         $sqlPath,
 328                         true
 329                 ];
 330         }
 331
 332         /**
 333          * @since 1.21
 334          *
 335          * @param string $tableName The table name
 336          * @param string $fieldName The field to be modified
 337          * @param string $sqlPath The path to the SQL change path
 338          */
 339         public function modifyExtensionField( $tableName, $fieldName, $sqlPath ) {
 340                 $this->extensionUpdates[] = [ 'modifyField', $tableName, $fieldName, $sqlPath, true ];
 341         }
 342
 343         /**
 344          *
 345          * @since 1.20
 346          *
 347          * @param string $tableName
 348          * @return bool
 349          */
 350         public function tableExists( $tableName ) {
 351                 return ( $this->db->tableExists( $tableName, __METHOD__ ) );
 352         }
 353
 354         /**
 355          * Add a maintenance script to be run after the database updates are complete.
 356          *
 357          * Script should subclass LoggedUpdateMaintenance
 358          *
 359          * @since 1.19
 360          *
 361          * @param string $class Name of a Maintenance subclass
 362          */
 363         public function addPostDatabaseUpdateMaintenance( $class ) {
 364                 $this->postDatabaseUpdateMaintenance[] = $class;
 365         }
 366
 367         /**
 368          * Get the list of extension-defined updates
 369          *
 370          * @return array
 371          */
 372         protected function getExtensionUpdates() {
 373                 return $this->extensionUpdates;
 374         }
 375
 376         /**
 377          * @since 1.17
 378          *
 379          * @return string[]
 380          */
 381         public function getPostDatabaseUpdateMaintenance() {
 382                 return $this->postDatabaseUpdateMaintenance;
 383         }
 384
 385         /**
 386          * @since 1.21
 387          *
 388          * Writes the schema updates desired to a file for the DB Admin to run.
 389          * @param array $schemaUpdate
 390          */
 391         private function writeSchemaUpdateFile( $schemaUpdate = [] ) {
 392                 $updates = $this->updatesSkipped;
 393                 $this->updatesSkipped = [];
 394
 395                 foreach ( $updates as $funcList ) {
 396                         $func = $funcList[0];
 397                         $arg = $funcList[1];
 398                         $origParams = $funcList[2];
 399                         call_user_func_array( $func, $arg );
 400                         flush();
 401                         $this->updatesSkipped[] = $origParams;
 402                 }
 403         }
 404
 405         /**
 406          * Do all the updates
 407          *
 408          * @param array $what What updates to perform
 409          */
 410         public function doUpdates( $what = [ 'core', 'extensions', 'stats' ] ) {
 411                 global $wgVersion;
 412
 413                 $what = array_flip( $what );
 414                 $this->skipSchema = isset( $what['noschema'] ) || $this->fileHandle !== null;
 415                 if ( isset( $what['core'] ) ) {
 416                         $this->runUpdates( $this->getCoreUpdateList(), false );
 417                 }
 418                 if ( isset( $what['extensions'] ) ) {
 419                         $this->runUpdates( $this->getOldGlobalUpdates(), false );
 420                         $this->runUpdates( $this->getExtensionUpdates(), true );
 421                 }
 422
 423                 if ( isset( $what['stats'] ) ) {
 424                         $this->checkStats();
 425                 }
 426
 427                 $this->setAppliedUpdates( $wgVersion, $this->updates );
 428
 429                 if ( $this->fileHandle ) {
 430                         $this->skipSchema = false;
 431                         $this->writeSchemaUpdateFile();
 432                         $this->setAppliedUpdates( "$wgVersion-schema", $this->updatesSkipped );
 433                 }
 434         }
 435
 436         /**
 437          * Helper function for doUpdates()
 438          *
 439          * @param array $updates Array of updates to run
 440          * @param bool $passSelf Whether to pass this object we calling external functions
 441          */
 442         private function runUpdates( array $updates, $passSelf ) {
 443                 $updatesDone = [];
 444                 $updatesSkipped = [];
 445                 foreach ( $updates as $params ) {
 446                         $origParams = $params;
 447                         $func = array_shift( $params );
 448                         if ( !is_array( $func ) && method_exists( $this, $func ) ) {
 449                                 $func = [ $this, $func ];
 450                         } elseif ( $passSelf ) {
 451                                 array_unshift( $params, $this );
 452                         }
 453                         $ret = call_user_func_array( $func, $params );
 454                         flush();
 455                         if ( $ret !== false ) {
 456                                 $updatesDone[] = $origParams;
 457                                 wfGetLBFactory()->waitForReplication();
 458                         } else {
 459                                 $updatesSkipped[] = [ $func, $params, $origParams ];
 460                         }
 461                 }
 462                 $this->updatesSkipped = array_merge( $this->updatesSkipped, $updatesSkipped );
 463                 $this->updates = array_merge( $this->updates, $updatesDone );
 464         }
 465
 466         /**
 467          * @param string $version
 468          * @param array $updates
 469          */
 470         protected function setAppliedUpdates( $version, $updates = [] ) {
 471                 $this->db->clearFlag( DBO_DDLMODE );
 472                 if ( !$this->canUseNewUpdatelog() ) {
 473                         return;
 474                 }
 475                 $key = "updatelist-$version-" . time() . self::$updateCounter;
 476                 self::$updateCounter++;
 477                 $this->db->insert( 'updatelog',
 478                         [ 'ul_key' => $key, 'ul_value' => serialize( $updates ) ],
 479                         __METHOD__ );
 480                 $this->db->setFlag( DBO_DDLMODE );
 481         }
 482
 483         /**
 484          * Helper function: check if the given key is present in the updatelog table.
 485          * Obviously, only use this for updates that occur after the updatelog table was
 486          * created!
 487          * @param string $key Name of the key to check for
 488          * @return bool
 489          */
 490         public function updateRowExists( $key ) {
 491                 $row = $this->db->selectRow(
 492                         'updatelog',
 493                         # Bug 65813
 494                         '1 AS X',
 495                         [ 'ul_key' => $key ],
 496                         __METHOD__
 497                 );
 498
 499                 return (bool)$row;
 500         }
 501
 502         /**
 503          * Helper function: Add a key to the updatelog table
 504          * Obviously, only use this for updates that occur after the updatelog table was
 505          * created!
 506          * @param string $key Name of key to insert
 507          * @param string $val [optional] Value to insert along with the key
 508          */
 509         public function insertUpdateRow( $key, $val = null ) {
 510                 $this->db->clearFlag( DBO_DDLMODE );
 511                 $values = [ 'ul_key' => $key ];
 512                 if ( $val && $this->canUseNewUpdatelog() ) {
 513                         $values['ul_value'] = $val;
 514                 }
 515                 $this->db->insert( 'updatelog', $values, __METHOD__, 'IGNORE' );
 516                 $this->db->setFlag( DBO_DDLMODE );
 517         }
 518
 519         /**
 520          * Updatelog was changed in 1.17 to have a ul_value column so we can record
 521          * more information about what kind of updates we've done (that's what this
 522          * class does). Pre-1.17 wikis won't have this column, and really old wikis
 523          * might not even have updatelog at all
 524          *
 525          * @return bool
 526          */
 527         protected function canUseNewUpdatelog() {
 528                 return $this->db->tableExists( 'updatelog', __METHOD__ ) &&
 529                         $this->db->fieldExists( 'updatelog', 'ul_value', __METHOD__ );
 530         }
 531
 532         /**
 533          * Returns whether updates should be executed on the database table $name.
 534          * Updates will be prevented if the table is a shared table and it is not
 535          * specified to run updates on shared tables.
 536          *
 537          * @param string $name Table name
 538          * @return bool
 539          */
 540         protected function doTable( $name ) {
 541                 global $wgSharedDB, $wgSharedTables;
 542
 543                 // Don't bother to check $wgSharedTables if there isn't a shared database
 544                 // or the user actually also wants to do updates on the shared database.
 545                 if ( $wgSharedDB === null || $this->shared ) {
 546                         return true;
 547                 }
 548
 549                 if ( in_array( $name, $wgSharedTables ) ) {
 550                         $this->output( "...skipping update to shared table $name.\n" );
 551                         return false;
 552                 } else {
 553                         return true;
 554                 }
 555         }
 556
 557         /**
 558          * Before 1.17, we used to handle updates via stuff like
 559          * $wgExtNewTables/Fields/Indexes. This is nasty :) We refactored a lot
 560          * of this in 1.17 but we want to remain back-compatible for a while. So
 561          * load up these old global-based things into our update list.
 562          *
 563          * @return array
 564          */
 565         protected function getOldGlobalUpdates() {
 566                 global $wgExtNewFields, $wgExtNewTables, $wgExtModifiedFields,
 567                         $wgExtNewIndexes;
 568
 569                 $updates = [];
 570
 571                 foreach ( $wgExtNewTables as $tableRecord ) {
 572                         $updates[] = [
 573                                 'addTable', $tableRecord[0], $tableRecord[1], true
 574                         ];
 575                 }
 576
 577                 foreach ( $wgExtNewFields as $fieldRecord ) {
 578                         $updates[] = [
 579                                 'addField', $fieldRecord[0], $fieldRecord[1],
 580                                 $fieldRecord[2], true
 581                         ];
 582                 }
 583
 584                 foreach ( $wgExtNewIndexes as $fieldRecord ) {
 585                         $updates[] = [
 586                                 'addIndex', $fieldRecord[0], $fieldRecord[1],
 587                                 $fieldRecord[2], true
 588                         ];
 589                 }
 590
 591                 foreach ( $wgExtModifiedFields as $fieldRecord ) {
 592                         $updates[] = [
 593                                 'modifyField', $fieldRecord[0], $fieldRecord[1],
 594                                 $fieldRecord[2], true
 595                         ];
 596                 }
 597
 598                 return $updates;
 599         }
 600
 601         /**
 602          * Get an array of updates to perform on the database. Should return a
 603          * multi-dimensional array. The main key is the MediaWiki version (1.12,
 604          * 1.13...) with the values being arrays of updates, identical to how
 605          * updaters.inc did it (for now)
 606          *
 607          * @return array
 608          */
 609         abstract protected function getCoreUpdateList();
 610
 611         /**
 612          * Append an SQL fragment to the open file handle.
 613          *
 614          * @param string $filename File name to open
 615          */
 616         public function copyFile( $filename ) {
 617                 $this->db->sourceFile( $filename, false, false, false,
 618                         [ $this, 'appendLine' ]
 619                 );
 620         }
 621
 622         /**
 623          * Append a line to the open filehandle.  The line is assumed to
 624          * be a complete SQL statement.
 625          *
 626          * This is used as a callback for sourceLine().
 627          *
 628          * @param string $line Text to append to the file
 629          * @return bool False to skip actually executing the file
 630          * @throws MWException
 631          */
 632         public function appendLine( $line ) {
 633                 $line = rtrim( $line ) . ";\n";
 634                 if ( fwrite( $this->fileHandle, $line ) === false ) {
 635                         throw new MWException( "trouble writing file" );
 636                 }
 637
 638                 return false;
 639         }
 640
 641         /**
 642          * Applies a SQL patch
 643          *
 644          * @param string $path Path to the patch file
 645          * @param bool $isFullPath Whether to treat $path as a relative or not
 646          * @param string $msg Description of the patch
 647          * @return bool False if patch is skipped.
 648          */
 649         protected function applyPatch( $path, $isFullPath = false, $msg = null ) {
 650                 if ( $msg === null ) {
 651                         $msg = "Applying $path patch";
 652                 }
 653                 if ( $this->skipSchema ) {
 654                         $this->output( "...skipping schema change ($msg).\n" );
 655
 656                         return false;
 657                 }
 658
 659                 $this->output( "$msg ..." );
 660
 661                 if ( !$isFullPath ) {
 662                         $path = $this->db->patchPath( $path );
 663                 }
 664                 if ( $this->fileHandle !== null ) {
 665                         $this->copyFile( $path );
 666                 } else {
 667                         $this->db->sourceFile( $path );
 668                 }
 669                 $this->output( "done.\n" );
 670
 671                 return true;
 672         }
 673
 674         /**
 675          * Add a new table to the database
 676          *
 677          * @param string $name Name of the new table
 678          * @param string $patch Path to the patch file
 679          * @param bool $fullpath Whether to treat $patch path as a relative or not
 680          * @return bool False if this was skipped because schema changes are skipped
 681          */
 682         protected function addTable( $name, $patch, $fullpath = false ) {
 683                 if ( !$this->doTable( $name ) ) {
 684                         return true;
 685                 }
 686
 687                 if ( $this->db->tableExists( $name, __METHOD__ ) ) {
 688                         $this->output( "...$name table already exists.\n" );
 689                 } else {
 690                         return $this->applyPatch( $patch, $fullpath, "Creating $name table" );
 691                 }
 692
 693                 return true;
 694         }
 695
 696         /**
 697          * Add a new field to an existing table
 698          *
 699          * @param string $table Name of the table to modify
 700          * @param string $field Name of the new field
 701          * @param string $patch Path to the patch file
 702          * @param bool $fullpath Whether to treat $patch path as a relative or not
 703          * @return bool False if this was skipped because schema changes are skipped
 704          */
 705         protected function addField( $table, $field, $patch, $fullpath = false ) {
 706                 if ( !$this->doTable( $table ) ) {
 707                         return true;
 708                 }
 709
 710                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 711                         $this->output( "...$table table does not exist, skipping new field patch.\n" );
 712                 } elseif ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 713                         $this->output( "...have $field field in $table table.\n" );
 714                 } else {
 715                         return $this->applyPatch( $patch, $fullpath, "Adding $field field to table $table" );
 716                 }
 717
 718                 return true;
 719         }
 720
 721         /**
 722          * Add a new index to an existing table
 723          *
 724          * @param string $table Name of the table to modify
 725          * @param string $index Name of the new index
 726          * @param string $patch Path to the patch file
 727          * @param bool $fullpath Whether to treat $patch path as a relative or not
 728          * @return bool False if this was skipped because schema changes are skipped
 729          */
 730         protected function addIndex( $table, $index, $patch, $fullpath = false ) {
 731                 if ( !$this->doTable( $table ) ) {
 732                         return true;
 733                 }
 734
 735                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 736                         $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
 737                 } elseif ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 738                         $this->output( "...index $index already set on $table table.\n" );
 739                 } else {
 740                         return $this->applyPatch( $patch, $fullpath, "Adding index $index to table $table" );
 741                 }
 742
 743                 return true;
 744         }
 745
 746         /**
 747          * Drop a field from an existing table
 748          *
 749          * @param string $table Name of the table to modify
 750          * @param string $field Name of the old field
 751          * @param string $patch Path to the patch file
 752          * @param bool $fullpath Whether to treat $patch path as a relative or not
 753          * @return bool False if this was skipped because schema changes are skipped
 754          */
 755         protected function dropField( $table, $field, $patch, $fullpath = false ) {
 756                 if ( !$this->doTable( $table ) ) {
 757                         return true;
 758                 }
 759
 760                 if ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 761                         return $this->applyPatch( $patch, $fullpath, "Table $table contains $field field. Dropping" );
 762                 } else {
 763                         $this->output( "...$table table does not contain $field field.\n" );
 764                 }
 765
 766                 return true;
 767         }
 768
 769         /**
 770          * Drop an index from an existing table
 771          *
 772          * @param string $table Name of the table to modify
 773          * @param string $index Name of the index
 774          * @param string $patch Path to the patch file
 775          * @param bool $fullpath Whether to treat $patch path as a relative or not
 776          * @return bool False if this was skipped because schema changes are skipped
 777          */
 778         protected function dropIndex( $table, $index, $patch, $fullpath = false ) {
 779                 if ( !$this->doTable( $table ) ) {
 780                         return true;
 781                 }
 782
 783                 if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
 784                         return $this->applyPatch( $patch, $fullpath, "Dropping $index index from table $table" );
 785                 } else {
 786                         $this->output( "...$index key doesn't exist.\n" );
 787                 }
 788
 789                 return true;
 790         }
 791
 792         /**
 793          * Rename an index from an existing table
 794          *
 795          * @param string $table Name of the table to modify
 796          * @param string $oldIndex Old name of the index
 797          * @param string $newIndex New name of the index
 798          * @param bool $skipBothIndexExistWarning Whether to warn if both the
 799          * old and the new indexes exist.
 800          * @param string $patch Path to the patch file
 801          * @param bool $fullpath Whether to treat $patch path as a relative or not
 802          * @return bool False if this was skipped because schema changes are skipped
 803          */
 804         protected function renameIndex( $table, $oldIndex, $newIndex,
 805                 $skipBothIndexExistWarning, $patch, $fullpath = false
 806         ) {
 807                 if ( !$this->doTable( $table ) ) {
 808                         return true;
 809                 }
 810
 811                 // First requirement: the table must exist
 812                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 813                         $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
 814
 815                         return true;
 816                 }
 817
 818                 // Second requirement: the new index must be missing
 819                 if ( $this->db->indexExists( $table, $newIndex, __METHOD__ ) ) {
 820                         $this->output( "...index $newIndex already set on $table table.\n" );
 821                         if ( !$skipBothIndexExistWarning &&
 822                                 $this->db->indexExists( $table, $oldIndex, __METHOD__ )
 823                         ) {
 824                                 $this->output( "...WARNING: $oldIndex still exists, despite it has " .
 825                                         "been renamed into $newIndex (which also exists).\n" .
 826                                         "            $oldIndex should be manually removed if not needed anymore.\n" );
 827                         }
 828
 829                         return true;
 830                 }
 831
 832                 // Third requirement: the old index must exist
 833                 if ( !$this->db->indexExists( $table, $oldIndex, __METHOD__ ) ) {
 834                         $this->output( "...skipping: index $oldIndex doesn't exist.\n" );
 835
 836                         return true;
 837                 }
 838
 839                 // Requirements have been satisfied, patch can be applied
 840                 return $this->applyPatch(
 841                         $patch,
 842                         $fullpath,
 843                         "Renaming index $oldIndex into $newIndex to table $table"
 844                 );
 845         }
 846
 847         /**
 848          * If the specified table exists, drop it, or execute the
 849          * patch if one is provided.
 850          *
 851          * Public @since 1.20
 852          *
 853          * @param string $table Table to drop.
 854          * @param string|bool $patch String of patch file that will drop the table. Default: false.
 855          * @param bool $fullpath Whether $patch is a full path. Default: false.
 856          * @return bool False if this was skipped because schema changes are skipped
 857          */
 858         public function dropTable( $table, $patch = false, $fullpath = false ) {
 859                 if ( !$this->doTable( $table ) ) {
 860                         return true;
 861                 }
 862
 863                 if ( $this->db->tableExists( $table, __METHOD__ ) ) {
 864                         $msg = "Dropping table $table";
 865
 866                         if ( $patch === false ) {
 867                                 $this->output( "$msg ..." );
 868                                 $this->db->dropTable( $table, __METHOD__ );
 869                                 $this->output( "done.\n" );
 870                         } else {
 871                                 return $this->applyPatch( $patch, $fullpath, $msg );
 872                         }
 873                 } else {
 874                         $this->output( "...$table doesn't exist.\n" );
 875                 }
 876
 877                 return true;
 878         }
 879
 880         /**
 881          * Modify an existing field
 882          *
 883          * @param string $table Name of the table to which the field belongs
 884          * @param string $field Name of the field to modify
 885          * @param string $patch Path to the patch file
 886          * @param bool $fullpath Whether to treat $patch path as a relative or not
 887          * @return bool False if this was skipped because schema changes are skipped
 888          */
 889         public function modifyField( $table, $field, $patch, $fullpath = false ) {
 890                 if ( !$this->doTable( $table ) ) {
 891                         return true;
 892                 }
 893
 894                 $updateKey = "$table-$field-$patch";
 895                 if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
 896                         $this->output( "...$table table does not exist, skipping modify field patch.\n" );
 897                 } elseif ( !$this->db->fieldExists( $table, $field, __METHOD__ ) ) {
 898                         $this->output( "...$field field does not exist in $table table, " .
 899                                 "skipping modify field patch.\n" );
 900                 } elseif ( $this->updateRowExists( $updateKey ) ) {
 901                         $this->output( "...$field in table $table already modified by patch $patch.\n" );
 902                 } else {
 903                         $this->insertUpdateRow( $updateKey );
 904
 905                         return $this->applyPatch( $patch, $fullpath, "Modifying $field field of table $table" );
 906                 }
 907
 908                 return true;
 909         }
 910
 911         /**
 912          * Set any .htaccess files or equivilent for storage repos
 913          *
 914          * Some zones (e.g. "temp") used to be public and may have been initialized as such
 915          */
 916         public function setFileAccess() {
 917                 $repo = RepoGroup::singleton()->getLocalRepo();
 918                 $zonePath = $repo->getZonePath( 'temp' );
 919                 if ( $repo->getBackend()->directoryExists( [ 'dir' => $zonePath ] ) ) {
 920                         // If the directory was never made, then it will have the right ACLs when it is made
 921                         $status = $repo->getBackend()->secure( [
 922                                 'dir' => $zonePath,
 923                                 'noAccess' => true,
 924                                 'noListing' => true
 925                         ] );
 926                         if ( $status->isOK() ) {
 927                                 $this->output( "Set the local repo temp zone container to be private.\n" );
 928                         } else {
 929                                 $this->output( "Failed to set the local repo temp zone container to be private.\n" );
 930                         }
 931                 }
 932         }
 933
 934         /**
 935          * Purge the objectcache table
 936          */
 937         public function purgeCache() {
 938                 global $wgLocalisationCacheConf;
 939                 # We can't guarantee that the user will be able to use TRUNCATE,
 940                 # but we know that DELETE is available to us
 941                 $this->output( "Purging caches..." );
 942                 $this->db->delete( 'objectcache', '*', __METHOD__ );
 943                 if ( $wgLocalisationCacheConf['manualRecache'] ) {
 944                         $this->rebuildLocalisationCache();
 945                 }
 946                 $blobStore = new MessageBlobStore();
 947                 $blobStore->clear();
 948                 $this->db->delete( 'module_deps', '*', __METHOD__ );
 949                 $this->output( "done.\n" );
 950         }
 951
 952         /**
 953          * Check the site_stats table is not properly populated.
 954          */
 955         protected function checkStats() {
 956                 $this->output( "...site_stats is populated..." );
 957                 $row = $this->db->selectRow( 'site_stats', '*', [ 'ss_row_id' => 1 ], __METHOD__ );
 958                 if ( $row === false ) {
 959                         $this->output( "data is missing! rebuilding...\n" );
 960                 } elseif ( isset( $row->site_stats ) && $row->ss_total_pages == -1 ) {
 961                         $this->output( "missing ss_total_pages, rebuilding...\n" );
 962                 } else {
 963                         $this->output( "done.\n" );
 964
 965                         return;
 966                 }
 967                 SiteStatsInit::doAllAndCommit( $this->db );
 968         }
 969
 970         # Common updater functions
 971
 972         /**
 973          * Sets the number of active users in the site_stats table
 974          */
 975         protected function doActiveUsersInit() {
 976                 $activeUsers = $this->db->selectField( 'site_stats', 'ss_active_users', false, __METHOD__ );
 977                 if ( $activeUsers == -1 ) {
 978                         $activeUsers = $this->db->selectField( 'recentchanges',
 979                                 'COUNT( DISTINCT rc_user_text )',
 980                                 [ 'rc_user != 0', 'rc_bot' => 0, "rc_log_type != 'newusers'" ], __METHOD__
 981                         );
 982                         $this->db->update( 'site_stats',
 983                                 [ 'ss_active_users' => intval( $activeUsers ) ],
 984                                 [ 'ss_row_id' => 1 ], __METHOD__, [ 'LIMIT' => 1 ]
 985                         );
 986                 }
 987                 $this->output( "...ss_active_users user count set...\n" );
 988         }
 989
 990         /**
 991          * Populates the log_user_text field in the logging table
 992          */
 993         protected function doLogUsertextPopulation() {
 994                 if ( !$this->updateRowExists( 'populate log_usertext' ) ) {
 995                         $this->output(
 996                                 "Populating log_user_text field, printing progress markers. For large\n" .
 997                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
 998                                 "maintenance/populateLogUsertext.php.\n"
 999                         );
1000
1001                         $task = $this->maintenance->runChild( 'PopulateLogUsertext' );
1002                         $task->execute();
1003                         $this->output( "done.\n" );
1004                 }
1005         }
1006
1007         /**
1008          * Migrate log params to new table and index for searching
1009          */
1010         protected function doLogSearchPopulation() {
1011                 if ( !$this->updateRowExists( 'populate log_search' ) ) {
1012                         $this->output(
1013                                 "Populating log_search table, printing progress markers. For large\n" .
1014                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
1015                                 "maintenance/populateLogSearch.php.\n" );
1016
1017                         $task = $this->maintenance->runChild( 'PopulateLogSearch' );
1018                         $task->execute();
1019                         $this->output( "done.\n" );
1020                 }
1021         }
1022
1023         /**
1024          * Updates the timestamps in the transcache table
1025          * @return bool
1026          */
1027         protected function doUpdateTranscacheField() {
1028                 if ( $this->updateRowExists( 'convert transcache field' ) ) {
1029                         $this->output( "...transcache tc_time already converted.\n" );
1030
1031                         return true;
1032                 }
1033
1034                 return $this->applyPatch( 'patch-tc-timestamp.sql', false,
1035                         "Converting tc_time from UNIX epoch to MediaWiki timestamp" );
1036         }
1037
1038         /**
1039          * Update CategoryLinks collation
1040          */
1041         protected function doCollationUpdate() {
1042                 global $wgCategoryCollation;
1043                 if ( $this->db->fieldExists( 'categorylinks', 'cl_collation', __METHOD__ ) ) {
1044                         if ( $this->db->selectField(
1045                                 'categorylinks',
1046                                 'COUNT(*)',
1047                                 'cl_collation != ' . $this->db->addQuotes( $wgCategoryCollation ),
1048                                 __METHOD__
1049                                 ) == 0
1050                         ) {
1051                                 $this->output( "...collations up-to-date.\n" );
1052
1053                                 return;
1054                         }
1055
1056                         $this->output( "Updating category collations..." );
1057                         $task = $this->maintenance->runChild( 'UpdateCollation' );
1058                         $task->execute();
1059                         $this->output( "...done.\n" );
1060                 }
1061         }
1062
1063         /**
1064          * Migrates user options from the user table blob to user_properties
1065          */
1066         protected function doMigrateUserOptions() {
1067                 if ( $this->db->tableExists( 'user_properties' ) ) {
1068                         $cl = $this->maintenance->runChild( 'ConvertUserOptions', 'convertUserOptions.php' );
1069                         $cl->execute();
1070                         $this->output( "done.\n" );
1071                 }
1072         }
1073
1074         /**
1075          * Enable profiling table when it's turned on
1076          */
1077         protected function doEnableProfiling() {
1078                 global $wgProfiler;
1079
1080                 if ( !$this->doTable( 'profiling' ) ) {
1081                         return true;
1082                 }
1083
1084                 $profileToDb = false;
1085                 if ( isset( $wgProfiler['output'] ) ) {
1086                         $out = $wgProfiler['output'];
1087                         if ( $out === 'db' ) {
1088                                 $profileToDb = true;
1089                         } elseif ( is_array( $out ) && in_array( 'db', $out ) ) {
1090                                 $profileToDb = true;
1091                         }
1092                 }
1093
1094                 if ( $profileToDb && !$this->db->tableExists( 'profiling', __METHOD__ ) ) {
1095                         $this->applyPatch( 'patch-profiling.sql', false, 'Add profiling table' );
1096                 }
1097         }
1098
1099         /**
1100          * Rebuilds the localisation cache
1101          */
1102         protected function rebuildLocalisationCache() {
1103                 /**
1104                  * @var $cl RebuildLocalisationCache
1105                  */
1106                 $cl = $this->maintenance->runChild( 'RebuildLocalisationCache', 'rebuildLocalisationCache.php' );
1107                 $this->output( "Rebuilding localisation cache...\n" );
1108                 $cl->setForce();
1109                 $cl->execute();
1110                 $this->output( "done.\n" );
1111         }
1112
1113         /**
1114          * Turns off content handler fields during parts of the upgrade
1115          * where they aren't available.
1116          */
1117         protected function disableContentHandlerUseDB() {
1118                 global $wgContentHandlerUseDB;
1119
1120                 if ( $wgContentHandlerUseDB ) {
1121                         $this->output( "Turning off Content Handler DB fields for this part of upgrade.\n" );
1122                         $this->holdContentHandlerUseDB = $wgContentHandlerUseDB;
1123                         $wgContentHandlerUseDB = false;
1124                 }
1125         }
1126
1127         /**
1128          * Turns content handler fields back on.
1129          */
1130         protected function enableContentHandlerUseDB() {
1131                 global $wgContentHandlerUseDB;
1132
1133                 if ( $this->holdContentHandlerUseDB ) {
1134                         $this->output( "Content Handler DB fields should be usable now.\n" );
1135                         $wgContentHandlerUseDB = $this->holdContentHandlerUseDB;
1136                 }
1137         }
1138 }