maintenance/Maintenance.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @ingroup Maintenance
  20  * @defgroup Maintenance Maintenance
  21  */
  22
  23 // Bail on old versions of PHP, or if composer has not been run yet to install
  24 // dependencies. Using dirname( __FILE__ ) here because __DIR__ is PHP5.3+.
  25 require_once dirname( __FILE__ ) . '/../includes/PHPVersionCheck.php';
  26 wfEntryPointCheck( 'cli' );
  27
  28 /**
  29  * @defgroup MaintenanceArchive Maintenance archives
  30  * @ingroup Maintenance
  31  */
  32
  33 // Define this so scripts can easily find doMaintenance.php
  34 define( 'RUN_MAINTENANCE_IF_MAIN', __DIR__ . '/doMaintenance.php' );
  35 define( 'DO_MAINTENANCE', RUN_MAINTENANCE_IF_MAIN ); // original name, harmless
  36
  37 $maintClass = false;
  38
  39 use MediaWiki\Logger\LoggerFactory;
  40
  41 /**
  42  * Abstract maintenance class for quickly writing and churning out
  43  * maintenance scripts with minimal effort. All that _must_ be defined
  44  * is the execute() method. See docs/maintenance.txt for more info
  45  * and a quick demo of how to use it.
  46  *
  47  * @author Chad Horohoe <chad@anyonecanedit.org>
  48  * @since 1.16
  49  * @ingroup Maintenance
  50  */
  51 abstract class Maintenance {
  52         /**
  53          * Constants for DB access type
  54          * @see Maintenance::getDbType()
  55          */
  56         const DB_NONE = 0;
  57         const DB_STD = 1;
  58         const DB_ADMIN = 2;
  59
  60         // Const for getStdin()
  61         const STDIN_ALL = 'all';
  62
  63         // This is the desired params
  64         protected $mParams = array();
  65
  66         // Array of mapping short parameters to long ones
  67         protected $mShortParamsMap = array();
  68
  69         // Array of desired args
  70         protected $mArgList = array();
  71
  72         // This is the list of options that were actually passed
  73         protected $mOptions = array();
  74
  75         // This is the list of arguments that were actually passed
  76         protected $mArgs = array();
  77
  78         // Name of the script currently running
  79         protected $mSelf;
  80
  81         // Special vars for params that are always used
  82         protected $mQuiet = false;
  83         protected $mDbUser, $mDbPass;
  84
  85         // A description of the script, children should change this
  86         protected $mDescription = '';
  87
  88         // Have we already loaded our user input?
  89         protected $mInputLoaded = false;
  90
  91         /**
  92          * Batch size. If a script supports this, they should set
  93          * a default with setBatchSize()
  94          *
  95          * @var int
  96          */
  97         protected $mBatchSize = null;
  98
  99         // Generic options added by addDefaultParams()
 100         private $mGenericParameters = array();
 101         // Generic options which might or not be supported by the script
 102         private $mDependantParameters = array();
 103
 104         /**
 105          * Used by getDB() / setDB()
 106          * @var DatabaseBase
 107          */
 108         private $mDb = null;
 109
 110         /**
 111          * Used when creating separate schema files.
 112          * @var resource
 113          */
 114         public $fileHandle;
 115
 116         /**
 117          * Accessible via getConfig()
 118          *
 119          * @var Config
 120          */
 121         private $config;
 122
 123         /**
 124          * Default constructor. Children should call this *first* if implementing
 125          * their own constructors
 126          */
 127         public function __construct() {
 128                 // Setup $IP, using MW_INSTALL_PATH if it exists
 129                 global $IP;
 130                 $IP = strval( getenv( 'MW_INSTALL_PATH' ) ) !== ''
 131                         ? getenv( 'MW_INSTALL_PATH' )
 132                         : realpath( __DIR__ . '/..' );
 133
 134                 $this->addDefaultParams();
 135                 register_shutdown_function( array( $this, 'outputChanneled' ), false );
 136         }
 137
 138         /**
 139          * Should we execute the maintenance script, or just allow it to be included
 140          * as a standalone class? It checks that the call stack only includes this
 141          * function and "requires" (meaning was called from the file scope)
 142          *
 143          * @return bool
 144          */
 145         public static function shouldExecute() {
 146                 global $wgCommandLineMode;
 147
 148                 if ( !function_exists( 'debug_backtrace' ) ) {
 149                         // If someone has a better idea...
 150                         return $wgCommandLineMode;
 151                 }
 152
 153                 $bt = debug_backtrace();
 154                 $count = count( $bt );
 155                 if ( $count < 2 ) {
 156                         return false; // sanity
 157                 }
 158                 if ( $bt[0]['class'] !== 'Maintenance' || $bt[0]['function'] !== 'shouldExecute' ) {
 159                         return false; // last call should be to this function
 160                 }
 161                 $includeFuncs = array( 'require_once', 'require', 'include', 'include_once' );
 162                 for ( $i = 1; $i < $count; $i++ ) {
 163                         if ( !in_array( $bt[$i]['function'], $includeFuncs ) ) {
 164                                 return false; // previous calls should all be "requires"
 165                         }
 166                 }
 167
 168                 return true;
 169         }
 170
 171         /**
 172          * Do the actual work. All child classes will need to implement this
 173          */
 174         abstract public function execute();
 175
 176         /**
 177          * Add a parameter to the script. Will be displayed on --help
 178          * with the associated description
 179          *
 180          * @param string $name The name of the param (help, version, etc)
 181          * @param string $description The description of the param to show on --help
 182          * @param bool $required Is the param required?
 183          * @param bool $withArg Is an argument required with this option?
 184          * @param string $shortName Character to use as short name
 185          */
 186         protected function addOption( $name, $description, $required = false,
 187                 $withArg = false, $shortName = false
 188         ) {
 189                 $this->mParams[$name] = array(
 190                         'desc' => $description,
 191                         'require' => $required,
 192                         'withArg' => $withArg,
 193                         'shortName' => $shortName
 194                 );
 195
 196                 if ( $shortName !== false ) {
 197                         $this->mShortParamsMap[$shortName] = $name;
 198                 }
 199         }
 200
 201         /**
 202          * Checks to see if a particular param exists.
 203          * @param string $name The name of the param
 204          * @return bool
 205          */
 206         protected function hasOption( $name ) {
 207                 return isset( $this->mOptions[$name] );
 208         }
 209
 210         /**
 211          * Get an option, or return the default
 212          * @param string $name The name of the param
 213          * @param mixed $default Anything you want, default null
 214          * @return mixed
 215          */
 216         protected function getOption( $name, $default = null ) {
 217                 if ( $this->hasOption( $name ) ) {
 218                         return $this->mOptions[$name];
 219                 } else {
 220                         // Set it so we don't have to provide the default again
 221                         $this->mOptions[$name] = $default;
 222
 223                         return $this->mOptions[$name];
 224                 }
 225         }
 226
 227         /**
 228          * Add some args that are needed
 229          * @param string $arg Name of the arg, like 'start'
 230          * @param string $description Short description of the arg
 231          * @param bool $required Is this required?
 232          */
 233         protected function addArg( $arg, $description, $required = true ) {
 234                 $this->mArgList[] = array(
 235                         'name' => $arg,
 236                         'desc' => $description,
 237                         'require' => $required
 238                 );
 239         }
 240
 241         /**
 242          * Remove an option.  Useful for removing options that won't be used in your script.
 243          * @param string $name The option to remove.
 244          */
 245         protected function deleteOption( $name ) {
 246                 unset( $this->mParams[$name] );
 247         }
 248
 249         /**
 250          * Set the description text.
 251          * @param string $text The text of the description
 252          */
 253         protected function addDescription( $text ) {
 254                 $this->mDescription = $text;
 255         }
 256
 257         /**
 258          * Does a given argument exist?
 259          * @param int $argId The integer value (from zero) for the arg
 260          * @return bool
 261          */
 262         protected function hasArg( $argId = 0 ) {
 263                 return isset( $this->mArgs[$argId] );
 264         }
 265
 266         /**
 267          * Get an argument.
 268          * @param int $argId The integer value (from zero) for the arg
 269          * @param mixed $default The default if it doesn't exist
 270          * @return mixed
 271          */
 272         protected function getArg( $argId = 0, $default = null ) {
 273                 return $this->hasArg( $argId ) ? $this->mArgs[$argId] : $default;
 274         }
 275
 276         /**
 277          * Set the batch size.
 278          * @param int $s The number of operations to do in a batch
 279          */
 280         protected function setBatchSize( $s = 0 ) {
 281                 $this->mBatchSize = $s;
 282
 283                 // If we support $mBatchSize, show the option.
 284                 // Used to be in addDefaultParams, but in order for that to
 285                 // work, subclasses would have to call this function in the constructor
 286                 // before they called parent::__construct which is just weird
 287                 // (and really wasn't done).
 288                 if ( $this->mBatchSize ) {
 289                         $this->addOption( 'batch-size', 'Run this many operations ' .
 290                                 'per batch, default: ' . $this->mBatchSize, false, true );
 291                         if ( isset( $this->mParams['batch-size'] ) ) {
 292                                 // This seems a little ugly...
 293                                 $this->mDependantParameters['batch-size'] = $this->mParams['batch-size'];
 294                         }
 295                 }
 296         }
 297
 298         /**
 299          * Get the script's name
 300          * @return string
 301          */
 302         public function getName() {
 303                 return $this->mSelf;
 304         }
 305
 306         /**
 307          * Return input from stdin.
 308          * @param int $len The number of bytes to read. If null, just return the handle.
 309          *   Maintenance::STDIN_ALL returns the full length
 310          * @return mixed
 311          */
 312         protected function getStdin( $len = null ) {
 313                 if ( $len == Maintenance::STDIN_ALL ) {
 314                         return file_get_contents( 'php://stdin' );
 315                 }
 316                 $f = fopen( 'php://stdin', 'rt' );
 317                 if ( !$len ) {
 318                         return $f;
 319                 }
 320                 $input = fgets( $f, $len );
 321                 fclose( $f );
 322
 323                 return rtrim( $input );
 324         }
 325
 326         /**
 327          * @return bool
 328          */
 329         public function isQuiet() {
 330                 return $this->mQuiet;
 331         }
 332
 333         /**
 334          * Throw some output to the user. Scripts can call this with no fears,
 335          * as we handle all --quiet stuff here
 336          * @param string $out The text to show to the user
 337          * @param mixed $channel Unique identifier for the channel. See function outputChanneled.
 338          */
 339         protected function output( $out, $channel = null ) {
 340                 if ( $this->mQuiet ) {
 341                         return;
 342                 }
 343                 if ( $channel === null ) {
 344                         $this->cleanupChanneled();
 345                         print $out;
 346                 } else {
 347                         $out = preg_replace( '/\n\z/', '', $out );
 348                         $this->outputChanneled( $out, $channel );
 349                 }
 350         }
 351
 352         /**
 353          * Throw an error to the user. Doesn't respect --quiet, so don't use
 354          * this for non-error output
 355          * @param string $err The error to display
 356          * @param int $die If > 0, go ahead and die out using this int as the code
 357          */
 358         protected function error( $err, $die = 0 ) {
 359                 $this->outputChanneled( false );
 360                 if ( PHP_SAPI == 'cli' ) {
 361                         fwrite( STDERR, $err . "\n" );
 362                 } else {
 363                         print $err;
 364                 }
 365                 $die = intval( $die );
 366                 if ( $die > 0 ) {
 367                         die( $die );
 368                 }
 369         }
 370
 371         private $atLineStart = true;
 372         private $lastChannel = null;
 373
 374         /**
 375          * Clean up channeled output.  Output a newline if necessary.
 376          */
 377         public function cleanupChanneled() {
 378                 if ( !$this->atLineStart ) {
 379                         print "\n";
 380                         $this->atLineStart = true;
 381                 }
 382         }
 383
 384         /**
 385          * Message outputter with channeled message support. Messages on the
 386          * same channel are concatenated, but any intervening messages in another
 387          * channel start a new line.
 388          * @param string $msg The message without trailing newline
 389          * @param string $channel Channel identifier or null for no
 390          *     channel. Channel comparison uses ===.
 391          */
 392         public function outputChanneled( $msg, $channel = null ) {
 393                 if ( $msg === false ) {
 394                         $this->cleanupChanneled();
 395
 396                         return;
 397                 }
 398
 399                 // End the current line if necessary
 400                 if ( !$this->atLineStart && $channel !== $this->lastChannel ) {
 401                         print "\n";
 402                 }
 403
 404                 print $msg;
 405
 406                 $this->atLineStart = false;
 407                 if ( $channel === null ) {
 408                         // For unchanneled messages, output trailing newline immediately
 409                         print "\n";
 410                         $this->atLineStart = true;
 411                 }
 412                 $this->lastChannel = $channel;
 413         }
 414
 415         /**
 416          * Does the script need different DB access? By default, we give Maintenance
 417          * scripts normal rights to the DB. Sometimes, a script needs admin rights
 418          * access for a reason and sometimes they want no access. Subclasses should
 419          * override and return one of the following values, as needed:
 420          *    Maintenance::DB_NONE  -  For no DB access at all
 421          *    Maintenance::DB_STD   -  For normal DB access, default
 422          *    Maintenance::DB_ADMIN -  For admin DB access
 423          * @return int
 424          */
 425         public function getDbType() {
 426                 return Maintenance::DB_STD;
 427         }
 428
 429         /**
 430          * Add the default parameters to the scripts
 431          */
 432         protected function addDefaultParams() {
 433
 434                 # Generic (non script dependant) options:
 435
 436                 $this->addOption( 'help', 'Display this help message', false, false, 'h' );
 437                 $this->addOption( 'quiet', 'Whether to supress non-error output', false, false, 'q' );
 438                 $this->addOption( 'conf', 'Location of LocalSettings.php, if not default', false, true );
 439                 $this->addOption( 'wiki', 'For specifying the wiki ID', false, true );
 440                 $this->addOption( 'globals', 'Output globals at the end of processing for debugging' );
 441                 $this->addOption(
 442                         'memory-limit',
 443                         'Set a specific memory limit for the script, '
 444                                 . '"max" for no limit or "default" to avoid changing it'
 445                 );
 446                 $this->addOption( 'server', "The protocol and server name to use in URLs, e.g. " .
 447                         "http://en.wikipedia.org. This is sometimes necessary because " .
 448                         "server name detection may fail in command line scripts.", false, true );
 449                 $this->addOption( 'profiler', 'Profiler output format (usually "text")', false, true );
 450
 451                 # Save generic options to display them separately in help
 452                 $this->mGenericParameters = $this->mParams;
 453
 454                 # Script dependant options:
 455
 456                 // If we support a DB, show the options
 457                 if ( $this->getDbType() > 0 ) {
 458                         $this->addOption( 'dbuser', 'The DB user to use for this script', false, true );
 459                         $this->addOption( 'dbpass', 'The password to use for this script', false, true );
 460                 }
 461
 462                 # Save additional script dependant options to display
 463                 # them separately in help
 464                 $this->mDependantParameters = array_diff_key( $this->mParams, $this->mGenericParameters );
 465         }
 466
 467         /**
 468          * @since 1.24
 469          * @return Config
 470          */
 471         public function getConfig() {
 472                 if ( $this->config === null ) {
 473                         $this->config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
 474                 }
 475
 476                 return $this->config;
 477         }
 478
 479         /**
 480          * @since 1.24
 481          * @param Config $config
 482          */
 483         public function setConfig( Config $config ) {
 484                 $this->config = $config;
 485         }
 486
 487         /**
 488          * Run a child maintenance script. Pass all of the current arguments
 489          * to it.
 490          * @param string $maintClass A name of a child maintenance class
 491          * @param string $classFile Full path of where the child is
 492          * @return Maintenance
 493          */
 494         public function runChild( $maintClass, $classFile = null ) {
 495                 // Make sure the class is loaded first
 496                 if ( !class_exists( $maintClass ) ) {
 497                         if ( $classFile ) {
 498                                 require_once $classFile;
 499                         }
 500                         if ( !class_exists( $maintClass ) ) {
 501                                 $this->error( "Cannot spawn child: $maintClass" );
 502                         }
 503                 }
 504
 505                 /**
 506                  * @var $child Maintenance
 507                  */
 508                 $child = new $maintClass();
 509                 $child->loadParamsAndArgs( $this->mSelf, $this->mOptions, $this->mArgs );
 510                 if ( !is_null( $this->mDb ) ) {
 511                         $child->setDB( $this->mDb );
 512                 }
 513
 514                 return $child;
 515         }
 516
 517         /**
 518          * Do some sanity checking and basic setup
 519          */
 520         public function setup() {
 521                 global $IP, $wgCommandLineMode, $wgRequestTime;
 522
 523                 # Abort if called from a web server
 524                 if ( isset( $_SERVER ) && isset( $_SERVER['REQUEST_METHOD'] ) ) {
 525                         $this->error( 'This script must be run from the command line', true );
 526                 }
 527
 528                 if ( $IP === null ) {
 529                         $this->error( "\$IP not set, aborting!\n" .
 530                                 '(Did you forget to call parent::__construct() in your maintenance script?)', 1 );
 531                 }
 532
 533                 # Make sure we can handle script parameters
 534                 if ( !defined( 'HPHP_VERSION' ) && !ini_get( 'register_argc_argv' ) ) {
 535                         $this->error( 'Cannot get command line arguments, register_argc_argv is set to false', true );
 536                 }
 537
 538                 // Send PHP warnings and errors to stderr instead of stdout.
 539                 // This aids in diagnosing problems, while keeping messages
 540                 // out of redirected output.
 541                 if ( ini_get( 'display_errors' ) ) {
 542                         ini_set( 'display_errors', 'stderr' );
 543                 }
 544
 545                 $this->loadParamsAndArgs();
 546                 $this->maybeHelp();
 547
 548                 # Set the memory limit
 549                 # Note we need to set it again later in cache LocalSettings changed it
 550                 $this->adjustMemoryLimit();
 551
 552                 # Set max execution time to 0 (no limit). PHP.net says that
 553                 # "When running PHP from the command line the default setting is 0."
 554                 # But sometimes this doesn't seem to be the case.
 555                 ini_set( 'max_execution_time', 0 );
 556
 557                 $wgRequestTime = microtime( true );
 558
 559                 # Define us as being in MediaWiki
 560                 define( 'MEDIAWIKI', true );
 561
 562                 $wgCommandLineMode = true;
 563
 564                 # Turn off output buffering if it's on
 565                 while ( ob_get_level() > 0 ) {
 566                         ob_end_flush();
 567                 }
 568
 569                 $this->validateParamsAndArgs();
 570         }
 571
 572         /**
 573          * Normally we disable the memory_limit when running admin scripts.
 574          * Some scripts may wish to actually set a limit, however, to avoid
 575          * blowing up unexpectedly. We also support a --memory-limit option,
 576          * to allow sysadmins to explicitly set one if they'd prefer to override
 577          * defaults (or for people using Suhosin which yells at you for trying
 578          * to disable the limits)
 579          * @return string
 580          */
 581         public function memoryLimit() {
 582                 $limit = $this->getOption( 'memory-limit', 'max' );
 583                 $limit = trim( $limit, "\" '" ); // trim quotes in case someone misunderstood
 584                 return $limit;
 585         }
 586
 587         /**
 588          * Adjusts PHP's memory limit to better suit our needs, if needed.
 589          */
 590         protected function adjustMemoryLimit() {
 591                 $limit = $this->memoryLimit();
 592                 if ( $limit == 'max' ) {
 593                         $limit = -1; // no memory limit
 594                 }
 595                 if ( $limit != 'default' ) {
 596                         ini_set( 'memory_limit', $limit );
 597                 }
 598         }
 599
 600         /**
 601          * Activate the profiler (assuming $wgProfiler is set)
 602          */
 603         protected function activateProfiler() {
 604                 global $wgProfiler, $wgProfileLimit, $wgTrxProfilerLimits;
 605
 606                 $output = $this->getOption( 'profiler' );
 607                 if ( !$output ) {
 608                         return;
 609                 }
 610
 611                 if ( is_array( $wgProfiler ) && isset( $wgProfiler['class'] ) ) {
 612                         $class = $wgProfiler['class'];
 613                         $profiler = new $class(
 614                                 array( 'sampling' => 1, 'output' => array( $output ) )
 615                                         + $wgProfiler
 616                                         + array( 'threshold' => $wgProfileLimit )
 617                         );
 618                         $profiler->setTemplated( true );
 619                         Profiler::replaceStubInstance( $profiler );
 620                 }
 621
 622                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 623                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 624                 $trxProfiler->setExpectations( $wgTrxProfilerLimits['Maintenance'], __METHOD__ );
 625         }
 626
 627         /**
 628          * Clear all params and arguments.
 629          */
 630         public function clearParamsAndArgs() {
 631                 $this->mOptions = array();
 632                 $this->mArgs = array();
 633                 $this->mInputLoaded = false;
 634         }
 635
 636         /**
 637          * Process command line arguments
 638          * $mOptions becomes an array with keys set to the option names
 639          * $mArgs becomes a zero-based array containing the non-option arguments
 640          *
 641          * @param string $self The name of the script, if any
 642          * @param array $opts An array of options, in form of key=>value
 643          * @param array $args An array of command line arguments
 644          */
 645         public function loadParamsAndArgs( $self = null, $opts = null, $args = null ) {
 646                 # If we were given opts or args, set those and return early
 647                 if ( $self ) {
 648                         $this->mSelf = $self;
 649                         $this->mInputLoaded = true;
 650                 }
 651                 if ( $opts ) {
 652                         $this->mOptions = $opts;
 653                         $this->mInputLoaded = true;
 654                 }
 655                 if ( $args ) {
 656                         $this->mArgs = $args;
 657                         $this->mInputLoaded = true;
 658                 }
 659
 660                 # If we've already loaded input (either by user values or from $argv)
 661                 # skip on loading it again. The array_shift() will corrupt values if
 662                 # it's run again and again
 663                 if ( $this->mInputLoaded ) {
 664                         $this->loadSpecialVars();
 665
 666                         return;
 667                 }
 668
 669                 global $argv;
 670                 $this->mSelf = array_shift( $argv );
 671
 672                 $options = array();
 673                 $args = array();
 674
 675                 # Parse arguments
 676                 for ( $arg = reset( $argv ); $arg !== false; $arg = next( $argv ) ) {
 677                         if ( $arg == '--' ) {
 678                                 # End of options, remainder should be considered arguments
 679                                 $arg = next( $argv );
 680                                 while ( $arg !== false ) {
 681                                         $args[] = $arg;
 682                                         $arg = next( $argv );
 683                                 }
 684                                 break;
 685                         } elseif ( substr( $arg, 0, 2 ) == '--' ) {
 686                                 # Long options
 687                                 $option = substr( $arg, 2 );
 688                                 if ( array_key_exists( $option, $options ) ) {
 689                                         $this->error( "\nERROR: $option parameter given twice\n" );
 690                                         $this->maybeHelp( true );
 691                                 }
 692                                 if ( isset( $this->mParams[$option] ) && $this->mParams[$option]['withArg'] ) {
 693                                         $param = next( $argv );
 694                                         if ( $param === false ) {
 695                                                 $this->error( "\nERROR: $option parameter needs a value after it\n" );
 696                                                 $this->maybeHelp( true );
 697                                         }
 698                                         $options[$option] = $param;
 699                                 } else {
 700                                         $bits = explode( '=', $option, 2 );
 701                                         if ( count( $bits ) > 1 ) {
 702                                                 $option = $bits[0];
 703                                                 $param = $bits[1];
 704                                         } else {
 705                                                 $param = 1;
 706                                         }
 707                                         $options[$option] = $param;
 708                                 }
 709                         } elseif ( $arg == '-' ) {
 710                                 # Lonely "-", often used to indicate stdin or stdout.
 711                                 $args[] = $arg;
 712                         } elseif ( substr( $arg, 0, 1 ) == '-' ) {
 713                                 # Short options
 714                                 $argLength = strlen( $arg );
 715                                 for ( $p = 1; $p < $argLength; $p++ ) {
 716                                         $option = $arg[$p];
 717                                         if ( !isset( $this->mParams[$option] ) && isset( $this->mShortParamsMap[$option] ) ) {
 718                                                 $option = $this->mShortParamsMap[$option];
 719                                         }
 720                                         if ( array_key_exists( $option, $options ) ) {
 721                                                 $this->error( "\nERROR: $option parameter given twice\n" );
 722                                                 $this->maybeHelp( true );
 723                                         }
 724                                         if ( isset( $this->mParams[$option]['withArg'] ) && $this->mParams[$option]['withArg'] ) {
 725                                                 $param = next( $argv );
 726                                                 if ( $param === false ) {
 727                                                         $this->error( "\nERROR: $option parameter needs a value after it\n" );
 728                                                         $this->maybeHelp( true );
 729                                                 }
 730                                                 $options[$option] = $param;
 731                                         } else {
 732                                                 $options[$option] = 1;
 733                                         }
 734                                 }
 735                         } else {
 736                                 $args[] = $arg;
 737                         }
 738                 }
 739
 740                 $this->mOptions = $options;
 741                 $this->mArgs = $args;
 742                 $this->loadSpecialVars();
 743                 $this->mInputLoaded = true;
 744         }
 745
 746         /**
 747          * Run some validation checks on the params, etc
 748          */
 749         protected function validateParamsAndArgs() {
 750                 $die = false;
 751                 # Check to make sure we've got all the required options
 752                 foreach ( $this->mParams as $opt => $info ) {
 753                         if ( $info['require'] && !$this->hasOption( $opt ) ) {
 754                                 $this->error( "Param $opt required!" );
 755                                 $die = true;
 756                         }
 757                 }
 758                 # Check arg list too
 759                 foreach ( $this->mArgList as $k => $info ) {
 760                         if ( $info['require'] && !$this->hasArg( $k ) ) {
 761                                 $this->error( 'Argument <' . $info['name'] . '> required!' );
 762                                 $die = true;
 763                         }
 764                 }
 765
 766                 if ( $die ) {
 767                         $this->maybeHelp( true );
 768                 }
 769         }
 770
 771         /**
 772          * Handle the special variables that are global to all scripts
 773          */
 774         protected function loadSpecialVars() {
 775                 if ( $this->hasOption( 'dbuser' ) ) {
 776                         $this->mDbUser = $this->getOption( 'dbuser' );
 777                 }
 778                 if ( $this->hasOption( 'dbpass' ) ) {
 779                         $this->mDbPass = $this->getOption( 'dbpass' );
 780                 }
 781                 if ( $this->hasOption( 'quiet' ) ) {
 782                         $this->mQuiet = true;
 783                 }
 784                 if ( $this->hasOption( 'batch-size' ) ) {
 785                         $this->mBatchSize = intval( $this->getOption( 'batch-size' ) );
 786                 }
 787         }
 788
 789         /**
 790          * Maybe show the help.
 791          * @param bool $force Whether to force the help to show, default false
 792          */
 793         protected function maybeHelp( $force = false ) {
 794                 if ( !$force && !$this->hasOption( 'help' ) ) {
 795                         return;
 796                 }
 797
 798                 $screenWidth = 80; // TODO: Calculate this!
 799                 $tab = "    ";
 800                 $descWidth = $screenWidth - ( 2 * strlen( $tab ) );
 801
 802                 ksort( $this->mParams );
 803                 $this->mQuiet = false;
 804
 805                 // Description ...
 806                 if ( $this->mDescription ) {
 807                         $this->output( "\n" . $this->mDescription . "\n" );
 808                 }
 809                 $output = "\nUsage: php " . basename( $this->mSelf );
 810
 811                 // ... append parameters ...
 812                 if ( $this->mParams ) {
 813                         $output .= " [--" . implode( array_keys( $this->mParams ), "|--" ) . "]";
 814                 }
 815
 816                 // ... and append arguments.
 817                 if ( $this->mArgList ) {
 818                         $output .= ' ';
 819                         foreach ( $this->mArgList as $k => $arg ) {
 820                                 if ( $arg['require'] ) {
 821                                         $output .= '<' . $arg['name'] . '>';
 822                                 } else {
 823                                         $output .= '[' . $arg['name'] . ']';
 824                                 }
 825                                 if ( $k < count( $this->mArgList ) - 1 ) {
 826                                         $output .= ' ';
 827                                 }
 828                         }
 829                 }
 830                 $this->output( "$output\n\n" );
 831
 832                 # TODO abstract some repetitive code below
 833
 834                 // Generic parameters
 835                 $this->output( "Generic maintenance parameters:\n" );
 836                 foreach ( $this->mGenericParameters as $par => $info ) {
 837                         if ( $info['shortName'] !== false ) {
 838                                 $par .= " (-{$info['shortName']})";
 839                         }
 840                         $this->output(
 841                                 wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 842                                         "\n$tab$tab" ) . "\n"
 843                         );
 844                 }
 845                 $this->output( "\n" );
 846
 847                 $scriptDependantParams = $this->mDependantParameters;
 848                 if ( count( $scriptDependantParams ) > 0 ) {
 849                         $this->output( "Script dependant parameters:\n" );
 850                         // Parameters description
 851                         foreach ( $scriptDependantParams as $par => $info ) {
 852                                 if ( $info['shortName'] !== false ) {
 853                                         $par .= " (-{$info['shortName']})";
 854                                 }
 855                                 $this->output(
 856                                         wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 857                                                 "\n$tab$tab" ) . "\n"
 858                                 );
 859                         }
 860                         $this->output( "\n" );
 861                 }
 862
 863                 // Script specific parameters not defined on construction by
 864                 // Maintenance::addDefaultParams()
 865                 $scriptSpecificParams = array_diff_key(
 866                         # all script parameters:
 867                         $this->mParams,
 868                         # remove the Maintenance default parameters:
 869                         $this->mGenericParameters,
 870                         $this->mDependantParameters
 871                 );
 872                 if ( count( $scriptSpecificParams ) > 0 ) {
 873                         $this->output( "Script specific parameters:\n" );
 874                         // Parameters description
 875                         foreach ( $scriptSpecificParams as $par => $info ) {
 876                                 if ( $info['shortName'] !== false ) {
 877                                         $par .= " (-{$info['shortName']})";
 878                                 }
 879                                 $this->output(
 880                                         wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 881                                                 "\n$tab$tab" ) . "\n"
 882                                 );
 883                         }
 884                         $this->output( "\n" );
 885                 }
 886
 887                 // Print arguments
 888                 if ( count( $this->mArgList ) > 0 ) {
 889                         $this->output( "Arguments:\n" );
 890                         // Arguments description
 891                         foreach ( $this->mArgList as $info ) {
 892                                 $openChar = $info['require'] ? '<' : '[';
 893                                 $closeChar = $info['require'] ? '>' : ']';
 894                                 $this->output(
 895                                         wordwrap( "$tab$openChar" . $info['name'] . "$closeChar: " .
 896                                                 $info['desc'], $descWidth, "\n$tab$tab" ) . "\n"
 897                                 );
 898                         }
 899                         $this->output( "\n" );
 900                 }
 901
 902                 die( 1 );
 903         }
 904
 905         /**
 906          * Handle some last-minute setup here.
 907          */
 908         public function finalSetup() {
 909                 global $wgCommandLineMode, $wgShowSQLErrors, $wgServer;
 910                 global $wgDBadminuser, $wgDBadminpassword;
 911                 global $wgDBuser, $wgDBpassword, $wgDBservers, $wgLBFactoryConf;
 912
 913                 # Turn off output buffering again, it might have been turned on in the settings files
 914                 if ( ob_get_level() ) {
 915                         ob_end_flush();
 916                 }
 917                 # Same with these
 918                 $wgCommandLineMode = true;
 919
 920                 # Override $wgServer
 921                 if ( $this->hasOption( 'server' ) ) {
 922                         $wgServer = $this->getOption( 'server', $wgServer );
 923                 }
 924
 925                 # If these were passed, use them
 926                 if ( $this->mDbUser ) {
 927                         $wgDBadminuser = $this->mDbUser;
 928                 }
 929                 if ( $this->mDbPass ) {
 930                         $wgDBadminpassword = $this->mDbPass;
 931                 }
 932
 933                 if ( $this->getDbType() == self::DB_ADMIN && isset( $wgDBadminuser ) ) {
 934                         $wgDBuser = $wgDBadminuser;
 935                         $wgDBpassword = $wgDBadminpassword;
 936
 937                         if ( $wgDBservers ) {
 938                                 /**
 939                                  * @var $wgDBservers array
 940                                  */
 941                                 foreach ( $wgDBservers as $i => $server ) {
 942                                         $wgDBservers[$i]['user'] = $wgDBuser;
 943                                         $wgDBservers[$i]['password'] = $wgDBpassword;
 944                                 }
 945                         }
 946                         if ( isset( $wgLBFactoryConf['serverTemplate'] ) ) {
 947                                 $wgLBFactoryConf['serverTemplate']['user'] = $wgDBuser;
 948                                 $wgLBFactoryConf['serverTemplate']['password'] = $wgDBpassword;
 949                         }
 950                         LBFactory::destroyInstance();
 951                 }
 952
 953                 // Per-script profiling; useful for debugging
 954                 $this->activateProfiler();
 955
 956                 $this->afterFinalSetup();
 957
 958                 $wgShowSQLErrors = true;
 959
 960                 MediaWiki\suppressWarnings();
 961                 set_time_limit( 0 );
 962                 MediaWiki\restoreWarnings();
 963
 964                 $this->adjustMemoryLimit();
 965         }
 966
 967         /**
 968          * Execute a callback function at the end of initialisation
 969          */
 970         protected function afterFinalSetup() {
 971                 if ( defined( 'MW_CMDLINE_CALLBACK' ) ) {
 972                         call_user_func( MW_CMDLINE_CALLBACK );
 973                 }
 974         }
 975
 976         /**
 977          * Potentially debug globals. Originally a feature only
 978          * for refreshLinks
 979          */
 980         public function globals() {
 981                 if ( $this->hasOption( 'globals' ) ) {
 982                         print_r( $GLOBALS );
 983                 }
 984         }
 985
 986         /**
 987          * Generic setup for most installs. Returns the location of LocalSettings
 988          * @return string
 989          */
 990         public function loadSettings() {
 991                 global $wgCommandLineMode, $IP;
 992
 993                 if ( isset( $this->mOptions['conf'] ) ) {
 994                         $settingsFile = $this->mOptions['conf'];
 995                 } elseif ( defined( "MW_CONFIG_FILE" ) ) {
 996                         $settingsFile = MW_CONFIG_FILE;
 997                 } else {
 998                         $settingsFile = "$IP/LocalSettings.php";
 999                 }
1000                 if ( isset( $this->mOptions['wiki'] ) ) {
1001                         $bits = explode( '-', $this->mOptions['wiki'] );
1002                         if ( count( $bits ) == 1 ) {
1003                                 $bits[] = '';
1004                         }
1005                         define( 'MW_DB', $bits[0] );
1006                         define( 'MW_PREFIX', $bits[1] );
1007                 }
1008
1009                 if ( !is_readable( $settingsFile ) ) {
1010                         $this->error( "A copy of your installation's LocalSettings.php\n" .
1011                                 "must exist and be readable in the source directory.\n" .
1012                                 "Use --conf to specify it.", true );
1013                 }
1014                 $wgCommandLineMode = true;
1015
1016                 return $settingsFile;
1017         }
1018
1019         /**
1020          * Support function for cleaning up redundant text records
1021          * @param bool $delete Whether or not to actually delete the records
1022          * @author Rob Church <robchur@gmail.com>
1023          */
1024         public function purgeRedundantText( $delete = true ) {
1025                 # Data should come off the master, wrapped in a transaction
1026                 $dbw = $this->getDB( DB_MASTER );
1027                 $dbw->begin( __METHOD__ );
1028
1029                 # Get "active" text records from the revisions table
1030                 $this->output( 'Searching for active text records in revisions table...' );
1031                 $res = $dbw->select( 'revision', 'rev_text_id', array(), __METHOD__, array( 'DISTINCT' ) );
1032                 foreach ( $res as $row ) {
1033                         $cur[] = $row->rev_text_id;
1034                 }
1035                 $this->output( "done.\n" );
1036
1037                 # Get "active" text records from the archive table
1038                 $this->output( 'Searching for active text records in archive table...' );
1039                 $res = $dbw->select( 'archive', 'ar_text_id', array(), __METHOD__, array( 'DISTINCT' ) );
1040                 foreach ( $res as $row ) {
1041                         # old pre-MW 1.5 records can have null ar_text_id's.
1042                         if ( $row->ar_text_id !== null ) {
1043                                 $cur[] = $row->ar_text_id;
1044                         }
1045                 }
1046                 $this->output( "done.\n" );
1047
1048                 # Get the IDs of all text records not in these sets
1049                 $this->output( 'Searching for inactive text records...' );
1050                 $cond = 'old_id NOT IN ( ' . $dbw->makeList( $cur ) . ' )';
1051                 $res = $dbw->select( 'text', 'old_id', array( $cond ), __METHOD__, array( 'DISTINCT' ) );
1052                 $old = array();
1053                 foreach ( $res as $row ) {
1054                         $old[] = $row->old_id;
1055                 }
1056                 $this->output( "done.\n" );
1057
1058                 # Inform the user of what we're going to do
1059                 $count = count( $old );
1060                 $this->output( "$count inactive items found.\n" );
1061
1062                 # Delete as appropriate
1063                 if ( $delete && $count ) {
1064                         $this->output( 'Deleting...' );
1065                         $dbw->delete( 'text', array( 'old_id' => $old ), __METHOD__ );
1066                         $this->output( "done.\n" );
1067                 }
1068
1069                 # Done
1070                 $dbw->commit( __METHOD__ );
1071         }
1072
1073         /**
1074          * Get the maintenance directory.
1075          * @return string
1076          */
1077         protected function getDir() {
1078                 return __DIR__;
1079         }
1080
1081         /**
1082          * Returns a database to be used by current maintenance script. It can be set by setDB().
1083          * If not set, wfGetDB() will be used.
1084          * This function has the same parameters as wfGetDB()
1085          *
1086          * @return DatabaseBase
1087          */
1088         protected function getDB( $db, $groups = array(), $wiki = false ) {
1089                 if ( is_null( $this->mDb ) ) {
1090                         return wfGetDB( $db, $groups, $wiki );
1091                 } else {
1092                         return $this->mDb;
1093                 }
1094         }
1095
1096         /**
1097          * Sets database object to be returned by getDB().
1098          *
1099          * @param DatabaseBase $db Database object to be used
1100          */
1101         public function setDB( $db ) {
1102                 $this->mDb = $db;
1103         }
1104
1105         /**
1106          * Lock the search index
1107          * @param DatabaseBase &$db
1108          */
1109         private function lockSearchindex( $db ) {
1110                 $write = array( 'searchindex' );
1111                 $read = array( 'page', 'revision', 'text', 'interwiki', 'l10n_cache', 'user', 'page_restrictions' );
1112                 $db->lockTables( $read, $write, __CLASS__ . '::' . __METHOD__ );
1113         }
1114
1115         /**
1116          * Unlock the tables
1117          * @param DatabaseBase &$db
1118          */
1119         private function unlockSearchindex( $db ) {
1120                 $db->unlockTables( __CLASS__ . '::' . __METHOD__ );
1121         }
1122
1123         /**
1124          * Unlock and lock again
1125          * Since the lock is low-priority, queued reads will be able to complete
1126          * @param DatabaseBase &$db
1127          */
1128         private function relockSearchindex( $db ) {
1129                 $this->unlockSearchindex( $db );
1130                 $this->lockSearchindex( $db );
1131         }
1132
1133         /**
1134          * Perform a search index update with locking
1135          * @param int $maxLockTime The maximum time to keep the search index locked.
1136          * @param string $callback The function that will update the function.
1137          * @param DatabaseBase $dbw
1138          * @param array $results
1139          */
1140         public function updateSearchIndex( $maxLockTime, $callback, $dbw, $results ) {
1141                 $lockTime = time();
1142
1143                 # Lock searchindex
1144                 if ( $maxLockTime ) {
1145                         $this->output( "   --- Waiting for lock ---" );
1146                         $this->lockSearchindex( $dbw );
1147                         $lockTime = time();
1148                         $this->output( "\n" );
1149                 }
1150
1151                 # Loop through the results and do a search update
1152                 foreach ( $results as $row ) {
1153                         # Allow reads to be processed
1154                         if ( $maxLockTime && time() > $lockTime + $maxLockTime ) {
1155                                 $this->output( "    --- Relocking ---" );
1156                                 $this->relockSearchindex( $dbw );
1157                                 $lockTime = time();
1158                                 $this->output( "\n" );
1159                         }
1160                         call_user_func( $callback, $dbw, $row );
1161                 }
1162
1163                 # Unlock searchindex
1164                 if ( $maxLockTime ) {
1165                         $this->output( "    --- Unlocking --" );
1166                         $this->unlockSearchindex( $dbw );
1167                         $this->output( "\n" );
1168                 }
1169         }
1170
1171         /**
1172          * Update the searchindex table for a given pageid
1173          * @param DatabaseBase $dbw A database write handle
1174          * @param int $pageId The page ID to update.
1175          * @return null|string
1176          */
1177         public function updateSearchIndexForPage( $dbw, $pageId ) {
1178                 // Get current revision
1179                 $rev = Revision::loadFromPageId( $dbw, $pageId );
1180                 $title = null;
1181                 if ( $rev ) {
1182                         $titleObj = $rev->getTitle();
1183                         $title = $titleObj->getPrefixedDBkey();
1184                         $this->output( "$title..." );
1185                         # Update searchindex
1186                         $u = new SearchUpdate( $pageId, $titleObj->getText(), $rev->getContent() );
1187                         $u->doUpdate();
1188                         $this->output( "\n" );
1189                 }
1190
1191                 return $title;
1192         }
1193
1194         /**
1195          * Wrapper for posix_isatty()
1196          * We default as considering stdin a tty (for nice readline methods)
1197          * but treating stout as not a tty to avoid color codes
1198          *
1199          * @param mixed $fd File descriptor
1200          * @return bool
1201          */
1202         public static function posix_isatty( $fd ) {
1203                 if ( !function_exists( 'posix_isatty' ) ) {
1204                         return !$fd;
1205                 } else {
1206                         return posix_isatty( $fd );
1207                 }
1208         }
1209
1210         /**
1211          * Prompt the console for input
1212          * @param string $prompt What to begin the line with, like '> '
1213          * @return string Response
1214          */
1215         public static function readconsole( $prompt = '> ' ) {
1216                 static $isatty = null;
1217                 if ( is_null( $isatty ) ) {
1218                         $isatty = self::posix_isatty( 0 /*STDIN*/ );
1219                 }
1220
1221                 if ( $isatty && function_exists( 'readline' ) ) {
1222                         $resp = readline( $prompt );
1223                         if ( $resp === null ) {
1224                                 // Workaround for https://github.com/facebook/hhvm/issues/4776
1225                                 return false;
1226                         } else {
1227                                 return $resp;
1228                         }
1229                 } else {
1230                         if ( $isatty ) {
1231                                 $st = self::readlineEmulation( $prompt );
1232                         } else {
1233                                 if ( feof( STDIN ) ) {
1234                                         $st = false;
1235                                 } else {
1236                                         $st = fgets( STDIN, 1024 );
1237                                 }
1238                         }
1239                         if ( $st === false ) {
1240                                 return false;
1241                         }
1242                         $resp = trim( $st );
1243
1244                         return $resp;
1245                 }
1246         }
1247
1248         /**
1249          * Emulate readline()
1250          * @param string $prompt What to begin the line with, like '> '
1251          * @return string
1252          */
1253         private static function readlineEmulation( $prompt ) {
1254                 $bash = Installer::locateExecutableInDefaultPaths( array( 'bash' ) );
1255                 if ( !wfIsWindows() && $bash ) {
1256                         $retval = false;
1257                         $encPrompt = wfEscapeShellArg( $prompt );
1258                         $command = "read -er -p $encPrompt && echo \"\$REPLY\"";
1259                         $encCommand = wfEscapeShellArg( $command );
1260                         $line = wfShellExec( "$bash -c $encCommand", $retval, array(), array( 'walltime' => 0 ) );
1261
1262                         if ( $retval == 0 ) {
1263                                 return $line;
1264                         } elseif ( $retval == 127 ) {
1265                                 // Couldn't execute bash even though we thought we saw it.
1266                                 // Shell probably spit out an error message, sorry :(
1267                                 // Fall through to fgets()...
1268                         } else {
1269                                 // EOF/ctrl+D
1270                                 return false;
1271                         }
1272                 }
1273
1274                 // Fallback... we'll have no editing controls, EWWW
1275                 if ( feof( STDIN ) ) {
1276                         return false;
1277                 }
1278                 print $prompt;
1279
1280                 return fgets( STDIN, 1024 );
1281         }
1282 }
1283
1284 /**
1285  * Fake maintenance wrapper, mostly used for the web installer/updater
1286  */
1287 class FakeMaintenance extends Maintenance {
1288         protected $mSelf = "FakeMaintenanceScript";
1289
1290         public function execute() {
1291                 return;
1292         }
1293 }
1294
1295 /**
1296  * Class for scripts that perform database maintenance and want to log the
1297  * update in `updatelog` so we can later skip it
1298  */
1299 abstract class LoggedUpdateMaintenance extends Maintenance {
1300         public function __construct() {
1301                 parent::__construct();
1302                 $this->addOption( 'force', 'Run the update even if it was completed already' );
1303                 $this->setBatchSize( 200 );
1304         }
1305
1306         public function execute() {
1307                 $db = $this->getDB( DB_MASTER );
1308                 $key = $this->getUpdateKey();
1309
1310                 if ( !$this->hasOption( 'force' )
1311                         && $db->selectRow( 'updatelog', '1', array( 'ul_key' => $key ), __METHOD__ )
1312                 ) {
1313                         $this->output( "..." . $this->updateSkippedMessage() . "\n" );
1314
1315                         return true;
1316                 }
1317
1318                 if ( !$this->doDBUpdates() ) {
1319                         return false;
1320                 }
1321
1322                 if ( $db->insert( 'updatelog', array( 'ul_key' => $key ), __METHOD__, 'IGNORE' ) ) {
1323                         return true;
1324                 } else {
1325                         $this->output( $this->updatelogFailedMessage() . "\n" );
1326
1327                         return false;
1328                 }
1329         }
1330
1331         /**
1332          * Message to show that the update was done already and was just skipped
1333          * @return string
1334          */
1335         protected function updateSkippedMessage() {
1336                 $key = $this->getUpdateKey();
1337
1338                 return "Update '{$key}' already logged as completed.";
1339         }
1340
1341         /**
1342          * Message to show that the update log was unable to log the completion of this update
1343          * @return string
1344          */
1345         protected function updatelogFailedMessage() {
1346                 $key = $this->getUpdateKey();
1347
1348                 return "Unable to log update '{$key}' as completed.";
1349         }
1350
1351         /**
1352          * Do the actual work. All child classes will need to implement this.
1353          * Return true to log the update as done or false (usually on failure).
1354          * @return bool
1355          */
1356         abstract protected function doDBUpdates();
1357
1358         /**
1359          * Get the update key name to go in the update log table
1360          * @return string
1361          */
1362         abstract protected function getUpdateKey();
1363 }