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 // Define this so scripts can easily find doMaintenance.php
  24 define( 'RUN_MAINTENANCE_IF_MAIN', dirname( __FILE__ ) . '/doMaintenance.php' );
  25 define( 'DO_MAINTENANCE', RUN_MAINTENANCE_IF_MAIN ); // original name, harmless
  26
  27 $maintClass = false;
  28
  29 // Make sure we're on PHP5 or better
  30 if ( version_compare( PHP_VERSION, '5.1.0' ) < 0 ) {
  31         die ( "Sorry! This version of MediaWiki requires PHP 5.1.x; you are running " .
  32                 PHP_VERSION . ".\n\n" .
  33                 "If you are sure you already have PHP 5.1.x or higher installed, it may be\n" .
  34                 "installed in a different path from PHP " . PHP_VERSION . ". Check with your system\n" .
  35                 "administrator.\n" );
  36 }
  37
  38 // Wrapper for posix_isatty()
  39 if ( !function_exists( 'posix_isatty' ) ) {
  40         # We default as considering stdin a tty (for nice readline methods)
  41         # but treating stout as not a tty to avoid color codes
  42         function posix_isatty( $fd ) {
  43                 return !$fd;
  44         }
  45 }
  46
  47 /**
  48  * Abstract maintenance class for quickly writing and churning out
  49  * maintenance scripts with minimal effort. All that _must_ be defined
  50  * is the execute() method. See docs/maintenance.txt for more info
  51  * and a quick demo of how to use it.
  52  *
  53  * @author Chad Horohoe <chad@anyonecanedit.org>
  54  * @since 1.16
  55  * @ingroup Maintenance
  56  */
  57 abstract class Maintenance {
  58
  59         /**
  60          * Constants for DB access type
  61          * @see Maintenance::getDbType()
  62          */
  63         const DB_NONE  = 0;
  64         const DB_STD   = 1;
  65         const DB_ADMIN = 2;
  66
  67         // Const for getStdin()
  68         const STDIN_ALL = 'all';
  69
  70         // This is the desired params
  71         protected $mParams = array();
  72
  73         // Array of desired args
  74         protected $mArgList = array();
  75
  76         // This is the list of options that were actually passed
  77         protected $mOptions = array();
  78
  79         // This is the list of arguments that were actually passed
  80         protected $mArgs = array();
  81
  82         // Name of the script currently running
  83         protected $mSelf;
  84
  85         // Special vars for params that are always used
  86         protected $mQuiet = false;
  87         protected $mDbUser, $mDbPass;
  88
  89         // A description of the script, children should change this
  90         protected $mDescription = '';
  91
  92         // Have we already loaded our user input?
  93         protected $mInputLoaded = false;
  94
  95         // Batch size. If a script supports this, they should set
  96         // a default with setBatchSize()
  97         protected $mBatchSize = null;
  98
  99         /**
 100          * List of all the core maintenance scripts. This is added
 101          * to scripts added by extensions in $wgMaintenanceScripts
 102          * and returned by getMaintenanceScripts()
 103          */
 104         protected static $mCoreScripts = null;
 105
 106         /**
 107          * Default constructor. Children should call this *first* if implementing
 108          * their own constructors
 109          */
 110         public function __construct() {
 111                 // Setup $IP, using MW_INSTALL_PATH if it exists
 112                 global $IP;
 113                 $IP = strval( getenv( 'MW_INSTALL_PATH' ) ) !== ''
 114                         ? getenv( 'MW_INSTALL_PATH' )
 115                         : realpath( dirname( __FILE__ ) . '/..' );
 116
 117                 $this->addDefaultParams();
 118                 register_shutdown_function( array( $this, 'outputChanneled' ), false );
 119         }
 120
 121         /**
 122          * Should we execute the maintenance script, or just allow it to be included
 123          * as a standalone class? It checks that the call stack only includes this
 124          * function and a require (meaning was called from the file scope)
 125          *
 126          * @return Boolean
 127          */
 128         public static function shouldExecute() {
 129                 $bt = debug_backtrace();
 130                 if( count( $bt ) !== 2 ) {
 131                         return false;
 132                 }
 133                 return $bt[1]['function'] == 'require_once' &&
 134                         $bt[0]['class'] == 'Maintenance' &&
 135                         $bt[0]['function'] == 'shouldExecute';
 136         }
 137
 138         /**
 139          * Do the actual work. All child classes will need to implement this
 140          */
 141         abstract public function execute();
 142
 143         /**
 144          * Add a parameter to the script. Will be displayed on --help
 145          * with the associated description
 146          *
 147          * @param $name String: the name of the param (help, version, etc)
 148          * @param $description String: the description of the param to show on --help
 149          * @param $required Boolean: is the param required?
 150          * @param $withArg Boolean: is an argument required with this option?
 151          */
 152         protected function addOption( $name, $description, $required = false, $withArg = false ) {
 153                 $this->mParams[$name] = array( 'desc' => $description, 'require' => $required, 'withArg' => $withArg );
 154         }
 155
 156         /**
 157          * Checks to see if a particular param exists.
 158          * @param $name String: the name of the param
 159          * @return Boolean
 160          */
 161         protected function hasOption( $name ) {
 162                 return isset( $this->mOptions[$name] );
 163         }
 164
 165         /**
 166          * Get an option, or return the default
 167          * @param $name String: the name of the param
 168          * @param $default Mixed: anything you want, default null
 169          * @return Mixed
 170          */
 171         protected function getOption( $name, $default = null ) {
 172                 if ( $this->hasOption( $name ) ) {
 173                         return $this->mOptions[$name];
 174                 } else {
 175                         // Set it so we don't have to provide the default again
 176                         $this->mOptions[$name] = $default;
 177                         return $this->mOptions[$name];
 178                 }
 179         }
 180
 181         /**
 182          * Add some args that are needed
 183          * @param $arg String: name of the arg, like 'start'
 184          * @param $description String: short description of the arg
 185          * @param $required Boolean: is this required?
 186          */
 187         protected function addArg( $arg, $description, $required = true ) {
 188                 $this->mArgList[] = array(
 189                         'name' => $arg,
 190                         'desc' => $description,
 191                         'require' => $required
 192                 );
 193         }
 194
 195         /**
 196          * Remove an option.  Useful for removing options that won't be used in your script.
 197          * @param $name String: the option to remove.
 198          */
 199         protected function deleteOption( $name ) {
 200                 unset( $this->mParams[$name] );
 201         }
 202
 203         /**
 204          * Set the description text.
 205          * @param $text String: the text of the description
 206          */
 207         protected function addDescription( $text ) {
 208                 $this->mDescription = $text;
 209         }
 210
 211         /**
 212          * Does a given argument exist?
 213          * @param $argId Integer: the integer value (from zero) for the arg
 214          * @return Boolean
 215          */
 216         protected function hasArg( $argId = 0 ) {
 217                 return isset( $this->mArgs[$argId] );
 218         }
 219
 220         /**
 221          * Get an argument.
 222          * @param $argId Integer: the integer value (from zero) for the arg
 223          * @param $default Mixed: the default if it doesn't exist
 224          * @return mixed
 225          */
 226         protected function getArg( $argId = 0, $default = null ) {
 227                 return $this->hasArg( $argId ) ? $this->mArgs[$argId] : $default;
 228         }
 229
 230         /**
 231          * Set the batch size.
 232          * @param $s Integer: the number of operations to do in a batch
 233          */
 234         protected function setBatchSize( $s = 0 ) {
 235                 $this->mBatchSize = $s;
 236         }
 237
 238         /**
 239          * Get the script's name
 240          * @return String
 241          */
 242         public function getName() {
 243                 return $this->mSelf;
 244         }
 245
 246         /**
 247          * Return input from stdin.
 248          * @param $len Integer: the number of bytes to read. If null,
 249          *        just return the handle. Maintenance::STDIN_ALL returns
 250          *        the full length
 251          * @return Mixed
 252          */
 253         protected function getStdin( $len = null ) {
 254                 if ( $len == Maintenance::STDIN_ALL ) {
 255                         return file_get_contents( 'php://stdin' );
 256                 }
 257                 $f = fopen( 'php://stdin', 'rt' );
 258                 if ( !$len ) {
 259                         return $f;
 260                 }
 261                 $input = fgets( $f, $len );
 262                 fclose( $f );
 263                 return rtrim( $input );
 264         }
 265
 266         public function isQuiet() {
 267                 return $this->mQuiet;
 268         }
 269
 270         /**
 271          * Throw some output to the user. Scripts can call this with no fears,
 272          * as we handle all --quiet stuff here
 273          * @param $out String: the text to show to the user
 274          * @param $channel Mixed: unique identifier for the channel. See
 275          *     function outputChanneled.
 276          */
 277         protected function output( $out, $channel = null ) {
 278                 if ( $this->mQuiet ) {
 279                         return;
 280                 }
 281                 if ( $channel === null ) {
 282                         $this->cleanupChanneled();
 283
 284                         $f = fopen( 'php://stdout', 'w' );
 285                         fwrite( $f, $out );
 286                         fclose( $f );
 287                 }
 288                 else {
 289                         $out = preg_replace( '/\n\z/', '', $out );
 290                         $this->outputChanneled( $out, $channel );
 291                 }
 292         }
 293
 294         /**
 295          * Throw an error to the user. Doesn't respect --quiet, so don't use
 296          * this for non-error output
 297          * @param $err String: the error to display
 298          * @param $die Boolean: If true, go ahead and die out.
 299          */
 300         protected function error( $err, $die = false ) {
 301                 $this->outputChanneled( false );
 302                 if ( php_sapi_name() == 'cli' ) {
 303                         fwrite( STDERR, $err . "\n" );
 304                 } else {
 305                         $f = fopen( 'php://stderr', 'w' );
 306                         fwrite( $f, $err . "\n" );
 307                         fclose( $f );
 308                 }
 309                 if ( $die ) {
 310                         die();
 311                 }
 312         }
 313
 314         private $atLineStart = true;
 315         private $lastChannel = null;
 316
 317         /**
 318          * Clean up channeled output.  Output a newline if necessary.
 319          */
 320         public function cleanupChanneled() {
 321                 if ( !$this->atLineStart ) {
 322                         $handle = fopen( 'php://stdout', 'w' );
 323                         fwrite( $handle, "\n" );
 324                         fclose( $handle );
 325                         $this->atLineStart = true;
 326                 }
 327         }
 328
 329         /**
 330          * Message outputter with channeled message support. Messages on the
 331          * same channel are concatenated, but any intervening messages in another
 332          * channel start a new line.
 333          * @param $msg String: the message without trailing newline
 334          * @param $channel Channel identifier or null for no
 335          *     channel. Channel comparison uses ===.
 336          */
 337         public function outputChanneled( $msg, $channel = null ) {
 338                 if ( $msg === false ) {
 339                         $this->cleanupChanneled();
 340                         return;
 341                 }
 342
 343                 $handle = fopen( 'php://stdout', 'w' );
 344
 345                 // End the current line if necessary
 346                 if ( !$this->atLineStart && $channel !== $this->lastChannel ) {
 347                         fwrite( $handle, "\n" );
 348                 }
 349
 350                 fwrite( $handle, $msg );
 351
 352                 $this->atLineStart = false;
 353                 if ( $channel === null ) {
 354                         // For unchanneled messages, output trailing newline immediately
 355                         fwrite( $handle, "\n" );
 356                         $this->atLineStart = true;
 357                 }
 358                 $this->lastChannel = $channel;
 359
 360                 // Cleanup handle
 361                 fclose( $handle );
 362         }
 363
 364         /**
 365          * Does the script need different DB access? By default, we give Maintenance
 366          * scripts normal rights to the DB. Sometimes, a script needs admin rights
 367          * access for a reason and sometimes they want no access. Subclasses should
 368          * override and return one of the following values, as needed:
 369          *    Maintenance::DB_NONE  -  For no DB access at all
 370          *    Maintenance::DB_STD   -  For normal DB access, default
 371          *    Maintenance::DB_ADMIN -  For admin DB access
 372          * @return Integer
 373          */
 374         public function getDbType() {
 375                 return Maintenance::DB_STD;
 376         }
 377
 378         /**
 379          * Add the default parameters to the scripts
 380          */
 381         protected function addDefaultParams() {
 382                 $this->addOption( 'help', 'Display this help message' );
 383                 $this->addOption( 'quiet', 'Whether to supress non-error output' );
 384                 $this->addOption( 'conf', 'Location of LocalSettings.php, if not default', false, true );
 385                 $this->addOption( 'wiki', 'For specifying the wiki ID', false, true );
 386                 $this->addOption( 'globals', 'Output globals at the end of processing for debugging' );
 387                 $this->addOption( 'memory-limit', 'Set a specific memory limit for the script, "max" for no limit or "default" to avoid changing it' );
 388                 $this->addOption( 'server', "The protocol and server name to use in URLs, e.g. " .
 389                                 "http://en.wikipedia.org. This is sometimes necessary because " .
 390                                 "server name detection may fail in command line scripts.", false, true );
 391                 // If we support a DB, show the options
 392                 if ( $this->getDbType() > 0 ) {
 393                         $this->addOption( 'dbuser', 'The DB user to use for this script', false, true );
 394                         $this->addOption( 'dbpass', 'The password to use for this script', false, true );
 395                 }
 396                 // If we support $mBatchSize, show the option
 397                 if ( $this->mBatchSize ) {
 398                         $this->addOption( 'batch-size', 'Run this many operations ' .
 399                                 'per batch, default: ' . $this->mBatchSize, false, true );
 400                 }
 401         }
 402
 403         /**
 404          * Run a child maintenance script. Pass all of the current arguments
 405          * to it.
 406          * @param $maintClass String: a name of a child maintenance class
 407          * @param $classFile String: full path of where the child is
 408          * @return Maintenance child
 409          */
 410         public function runChild( $maintClass, $classFile = null ) {
 411                 // Make sure the class is loaded first
 412                 if ( !class_exists( $maintClass ) ) {
 413                         if ( $classFile ) {
 414                                 require_once( $classFile );
 415                         }
 416                         if ( !class_exists( $maintClass ) ) {
 417                                 $this->error( "Cannot spawn child: $maintClass" );
 418                         }
 419                 }
 420
 421                 $child = new $maintClass();
 422                 $child->loadParamsAndArgs( $this->mSelf, $this->mOptions, $this->mArgs );
 423                 return $child;
 424         }
 425
 426         /**
 427          * Do some sanity checking and basic setup
 428          */
 429         public function setup() {
 430                 global $wgCommandLineMode, $wgRequestTime;
 431
 432                 # Abort if called from a web server
 433                 if ( isset( $_SERVER ) && isset( $_SERVER['REQUEST_METHOD'] ) ) {
 434                         $this->error( 'This script must be run from the command line', true );
 435                 }
 436
 437                 # Make sure we can handle script parameters
 438                 if ( !ini_get( 'register_argc_argv' ) ) {
 439                         $this->error( 'Cannot get command line arguments, register_argc_argv is set to false', true );
 440                 }
 441
 442                 if ( version_compare( phpversion(), '5.2.4' ) >= 0 ) {
 443                         // Send PHP warnings and errors to stderr instead of stdout.
 444                         // This aids in diagnosing problems, while keeping messages
 445                         // out of redirected output.
 446                         if ( ini_get( 'display_errors' ) ) {
 447                                 ini_set( 'display_errors', 'stderr' );
 448                         }
 449
 450                         // Don't touch the setting on earlier versions of PHP,
 451                         // as setting it would disable output if you'd wanted it.
 452
 453                         // Note that exceptions are also sent to stderr when
 454                         // command-line mode is on, regardless of PHP version.
 455                 }
 456
 457                 $this->loadParamsAndArgs();
 458                 $this->maybeHelp();
 459
 460                 # Set the memory limit
 461                 # Note we need to set it again later in cache LocalSettings changed it
 462                 $this->adjustMemoryLimit();
 463
 464                 # Set max execution time to 0 (no limit). PHP.net says that
 465                 # "When running PHP from the command line the default setting is 0."
 466                 # But sometimes this doesn't seem to be the case.
 467                 ini_set( 'max_execution_time', 0 );
 468
 469                 $wgRequestTime = microtime( true );
 470
 471                 # Define us as being in MediaWiki
 472                 define( 'MEDIAWIKI', true );
 473
 474                 $wgCommandLineMode = true;
 475                 # Turn off output buffering if it's on
 476                 @ob_end_flush();
 477
 478                 $this->validateParamsAndArgs();
 479         }
 480
 481         /**
 482          * Normally we disable the memory_limit when running admin scripts.
 483          * Some scripts may wish to actually set a limit, however, to avoid
 484          * blowing up unexpectedly. We also support a --memory-limit option,
 485          * to allow sysadmins to explicitly set one if they'd prefer to override
 486          * defaults (or for people using Suhosin which yells at you for trying
 487          * to disable the limits)
 488          */
 489         public function memoryLimit() {
 490                 $limit = $this->getOption( 'memory-limit', 'max' );
 491                 $limit = trim( $limit, "\" '" ); // trim quotes in case someone misunderstood
 492                 return $limit;
 493         }
 494
 495         /**
 496          * Adjusts PHP's memory limit to better suit our needs, if needed.
 497          */
 498         protected function adjustMemoryLimit() {
 499                 $limit = $this->memoryLimit();
 500                 if ( $limit == 'max' ) {
 501                         $limit = -1; // no memory limit
 502                 }
 503                 if ( $limit != 'default' ) {
 504                         ini_set( 'memory_limit', $limit );
 505                 }
 506         }
 507
 508         /**
 509          * Clear all params and arguments.
 510          */
 511         public function clearParamsAndArgs() {
 512                 $this->mOptions = array();
 513                 $this->mArgs = array();
 514                 $this->mInputLoaded = false;
 515         }
 516
 517         /**
 518          * Process command line arguments
 519          * $mOptions becomes an array with keys set to the option names
 520          * $mArgs becomes a zero-based array containing the non-option arguments
 521          *
 522          * @param $self String The name of the script, if any
 523          * @param $opts Array An array of options, in form of key=>value
 524          * @param $args Array An array of command line arguments
 525          */
 526         public function loadParamsAndArgs( $self = null, $opts = null, $args = null ) {
 527                 # If we were given opts or args, set those and return early
 528                 if ( $self ) {
 529                         $this->mSelf = $self;
 530                         $this->mInputLoaded = true;
 531                 }
 532                 if ( $opts ) {
 533                         $this->mOptions = $opts;
 534                         $this->mInputLoaded = true;
 535                 }
 536                 if ( $args ) {
 537                         $this->mArgs = $args;
 538                         $this->mInputLoaded = true;
 539                 }
 540
 541                 # If we've already loaded input (either by user values or from $argv)
 542                 # skip on loading it again. The array_shift() will corrupt values if
 543                 # it's run again and again
 544                 if ( $this->mInputLoaded ) {
 545                         $this->loadSpecialVars();
 546                         return;
 547                 }
 548
 549                 global $argv;
 550                 $this->mSelf = array_shift( $argv );
 551
 552                 $options = array();
 553                 $args = array();
 554
 555                 # Parse arguments
 556                 for ( $arg = reset( $argv ); $arg !== false; $arg = next( $argv ) ) {
 557                         if ( $arg == '--' ) {
 558                                 # End of options, remainder should be considered arguments
 559                                 $arg = next( $argv );
 560                                 while ( $arg !== false ) {
 561                                         $args[] = $arg;
 562                                         $arg = next( $argv );
 563                                 }
 564                                 break;
 565                         } elseif ( substr( $arg, 0, 2 ) == '--' ) {
 566                                 # Long options
 567                                 $option = substr( $arg, 2 );
 568                                 if ( isset( $this->mParams[$option] ) && $this->mParams[$option]['withArg'] ) {
 569                                         $param = next( $argv );
 570                                         if ( $param === false ) {
 571                                                 $this->error( "\nERROR: $option needs a value after it\n" );
 572                                                 $this->maybeHelp( true );
 573                                         }
 574                                         $options[$option] = $param;
 575                                 } else {
 576                                         $bits = explode( '=', $option, 2 );
 577                                         if ( count( $bits ) > 1 ) {
 578                                                 $option = $bits[0];
 579                                                 $param = $bits[1];
 580                                         } else {
 581                                                 $param = 1;
 582                                         }
 583                                         $options[$option] = $param;
 584                                 }
 585                         } elseif ( substr( $arg, 0, 1 ) == '-' ) {
 586                                 # Short options
 587                                 for ( $p = 1; $p < strlen( $arg ); $p++ ) {
 588                                         $option = $arg { $p } ;
 589                                         if ( isset( $this->mParams[$option]['withArg'] ) && $this->mParams[$option]['withArg'] ) {
 590                                                 $param = next( $argv );
 591                                                 if ( $param === false ) {
 592                                                         $this->error( "\nERROR: $option needs a value after it\n" );
 593                                                         $this->maybeHelp( true );
 594                                                 }
 595                                                 $options[$option] = $param;
 596                                         } else {
 597                                                 $options[$option] = 1;
 598                                         }
 599                                 }
 600                         } else {
 601                                 $args[] = $arg;
 602                         }
 603                 }
 604
 605                 $this->mOptions = $options;
 606                 $this->mArgs = $args;
 607                 $this->loadSpecialVars();
 608                 $this->mInputLoaded = true;
 609         }
 610
 611         /**
 612          * Run some validation checks on the params, etc
 613          */
 614         protected function validateParamsAndArgs() {
 615                 $die = false;
 616                 # Check to make sure we've got all the required options
 617                 foreach ( $this->mParams as $opt => $info ) {
 618                         if ( $info['require'] && !$this->hasOption( $opt ) ) {
 619                                 $this->error( "Param $opt required!" );
 620                                 $die = true;
 621                         }
 622                 }
 623                 # Check arg list too
 624                 foreach ( $this->mArgList as $k => $info ) {
 625                         if ( $info['require'] && !$this->hasArg( $k ) ) {
 626                                 $this->error( 'Argument <' . $info['name'] . '> required!' );
 627                                 $die = true;
 628                         }
 629                 }
 630
 631                 if ( $die ) {
 632                         $this->maybeHelp( true );
 633                 }
 634         }
 635
 636         /**
 637          * Handle the special variables that are global to all scripts
 638          */
 639         protected function loadSpecialVars() {
 640                 if ( $this->hasOption( 'dbuser' ) ) {
 641                         $this->mDbUser = $this->getOption( 'dbuser' );
 642                 }
 643                 if ( $this->hasOption( 'dbpass' ) ) {
 644                         $this->mDbPass = $this->getOption( 'dbpass' );
 645                 }
 646                 if ( $this->hasOption( 'quiet' ) ) {
 647                         $this->mQuiet = true;
 648                 }
 649                 if ( $this->hasOption( 'batch-size' ) ) {
 650                         $this->mBatchSize = $this->getOption( 'batch-size' );
 651                 }
 652         }
 653
 654         /**
 655          * Maybe show the help.
 656          * @param $force boolean Whether to force the help to show, default false
 657          */
 658         protected function maybeHelp( $force = false ) {
 659                 if( !$force && !$this->hasOption( 'help' ) ) {
 660                         return;
 661                 }
 662
 663                 $screenWidth = 80; // TODO: Caculate this!
 664                 $tab = "    ";
 665                 $descWidth = $screenWidth - ( 2 * strlen( $tab ) );
 666
 667                 ksort( $this->mParams );
 668                 $this->mQuiet = false;
 669
 670                 // Description ...
 671                 if ( $this->mDescription ) {
 672                         $this->output( "\n" . $this->mDescription . "\n" );
 673                 }
 674                 $output = "\nUsage: php " . basename( $this->mSelf );
 675
 676                 // ... append parameters ...
 677                 if ( $this->mParams ) {
 678                         $output .= " [--" . implode( array_keys( $this->mParams ), "|--" ) . "]";
 679                 }
 680
 681                 // ... and append arguments.
 682                 if ( $this->mArgList ) {
 683                         $output .= ' ';
 684                         foreach ( $this->mArgList as $k => $arg ) {
 685                                 if ( $arg['require'] ) {
 686                                         $output .= '<' . $arg['name'] . '>';
 687                                 } else {
 688                                         $output .= '[' . $arg['name'] . ']';
 689                                 }
 690                                 if ( $k < count( $this->mArgList ) - 1 )
 691                                         $output .= ' ';
 692                         }
 693                 }
 694                 $this->output( "$output\n\n" );
 695
 696                 // Parameters description
 697                 foreach ( $this->mParams as $par => $info ) {
 698                         $this->output(
 699                                 wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 700                                                 "\n$tab$tab" ) . "\n"
 701                         );
 702                 }
 703
 704                 // Arguments description
 705                 foreach ( $this->mArgList as $info ) {
 706                         $openChar = $info['require'] ? '<' : '[';
 707                         $closeChar = $info['require'] ? '>' : ']';
 708                         $this->output(
 709                                 wordwrap( "$tab$openChar" . $info['name'] . "$closeChar: " .
 710                                         $info['desc'], $descWidth, "\n$tab$tab" ) . "\n"
 711                         );
 712                 }
 713
 714                 die( 1 );
 715         }
 716
 717         /**
 718          * Handle some last-minute setup here.
 719          */
 720         public function finalSetup() {
 721                 global $wgCommandLineMode, $wgShowSQLErrors, $wgServer;
 722                 global $wgProfiling, $wgDBadminuser, $wgDBadminpassword;
 723                 global $wgDBuser, $wgDBpassword, $wgDBservers, $wgLBFactoryConf;
 724
 725                 # Turn off output buffering again, it might have been turned on in the settings files
 726                 if ( ob_get_level() ) {
 727                         ob_end_flush();
 728                 }
 729                 # Same with these
 730                 $wgCommandLineMode = true;
 731
 732                 # Override $wgServer
 733                 if( $this->hasOption( 'server') ) {
 734                         $wgServer = $this->getOption( 'server', $wgServer );
 735                 }
 736
 737                 # If these were passed, use them
 738                 if ( $this->mDbUser ) {
 739                         $wgDBadminuser = $this->mDbUser;
 740                 }
 741                 if ( $this->mDbPass ) {
 742                         $wgDBadminpassword = $this->mDbPass;
 743                 }
 744
 745                 if ( $this->getDbType() == self::DB_ADMIN && isset( $wgDBadminuser ) ) {
 746                         $wgDBuser = $wgDBadminuser;
 747                         $wgDBpassword = $wgDBadminpassword;
 748
 749                         if ( $wgDBservers ) {
 750                                 foreach ( $wgDBservers as $i => $server ) {
 751                                         $wgDBservers[$i]['user'] = $wgDBuser;
 752                                         $wgDBservers[$i]['password'] = $wgDBpassword;
 753                                 }
 754                         }
 755                         if ( isset( $wgLBFactoryConf['serverTemplate'] ) ) {
 756                                 $wgLBFactoryConf['serverTemplate']['user'] = $wgDBuser;
 757                                 $wgLBFactoryConf['serverTemplate']['password'] = $wgDBpassword;
 758                         }
 759                         LBFactory::destroyInstance();
 760                 }
 761
 762                 $this->afterFinalSetup();
 763
 764                 $wgShowSQLErrors = true;
 765                 @set_time_limit( 0 );
 766                 $this->adjustMemoryLimit();
 767
 768                 $wgProfiling = false; // only for Profiler.php mode; avoids OOM errors
 769         }
 770
 771         /**
 772          * Execute a callback function at the end of initialisation
 773          */
 774         protected function afterFinalSetup() {
 775                 if ( defined( 'MW_CMDLINE_CALLBACK' ) ) {
 776                         call_user_func( MW_CMDLINE_CALLBACK );
 777                 }
 778         }
 779
 780         /**
 781          * Potentially debug globals. Originally a feature only
 782          * for refreshLinks
 783          */
 784         public function globals() {
 785                 if ( $this->hasOption( 'globals' ) ) {
 786                         print_r( $GLOBALS );
 787                 }
 788         }
 789
 790         /**
 791          * Do setup specific to WMF
 792          */
 793         public function loadWikimediaSettings() {
 794                 global $IP, $wgNoDBParam, $wgUseNormalUser, $wgConf, $site, $lang;
 795
 796                 if ( empty( $wgNoDBParam ) ) {
 797                         # Check if we were passed a db name
 798                         if ( isset( $this->mOptions['wiki'] ) ) {
 799                                 $db = $this->mOptions['wiki'];
 800                         } else {
 801                                 $db = array_shift( $this->mArgs );
 802                         }
 803                         list( $site, $lang ) = $wgConf->siteFromDB( $db );
 804
 805                         # If not, work out the language and site the old way
 806                         if ( is_null( $site ) || is_null( $lang ) ) {
 807                                 if ( !$db ) {
 808                                         $lang = 'aa';
 809                                 } else {
 810                                         $lang = $db;
 811                                 }
 812                                 if ( isset( $this->mArgs[0] ) ) {
 813                                         $site = array_shift( $this->mArgs );
 814                                 } else {
 815                                         $site = 'wikipedia';
 816                                 }
 817                         }
 818                 } else {
 819                         $lang = 'aa';
 820                         $site = 'wikipedia';
 821                 }
 822
 823                 # This is for the IRC scripts, which now run as the apache user
 824                 # The apache user doesn't have access to the wikiadmin_pass command
 825                 if ( $_ENV['USER'] == 'apache' ) {
 826                 # if ( posix_geteuid() == 48 ) {
 827                         $wgUseNormalUser = true;
 828                 }
 829
 830                 putenv( 'wikilang=' . $lang );
 831
 832                 ini_set( 'include_path', ".:$IP:$IP/includes:$IP/languages:$IP/maintenance" );
 833
 834                 if ( $lang == 'test' && $site == 'wikipedia' ) {
 835                         define( 'TESTWIKI', 1 );
 836                 }
 837         }
 838
 839         /**
 840          * Generic setup for most installs. Returns the location of LocalSettings
 841          * @return String
 842          */
 843         public function loadSettings() {
 844                 global $wgWikiFarm, $wgCommandLineMode, $IP;
 845
 846                 $wgWikiFarm = false;
 847                 if ( isset( $this->mOptions['conf'] ) ) {
 848                         $settingsFile = $this->mOptions['conf'];
 849                 } else if ( defined("MW_CONFIG_FILE") ) {
 850                         $settingsFile = MW_CONFIG_FILE;
 851                 } else {
 852                         $settingsFile = "$IP/LocalSettings.php";
 853                 }
 854                 if ( isset( $this->mOptions['wiki'] ) ) {
 855                         $bits = explode( '-', $this->mOptions['wiki'] );
 856                         if ( count( $bits ) == 1 ) {
 857                                 $bits[] = '';
 858                         }
 859                         define( 'MW_DB', $bits[0] );
 860                         define( 'MW_PREFIX', $bits[1] );
 861                 }
 862
 863                 if ( !is_readable( $settingsFile ) ) {
 864                         $this->error( "A copy of your installation's LocalSettings.php\n" .
 865                                                 "must exist and be readable in the source directory.\n" .
 866                                                 "Use --conf to specify it." , true );
 867                 }
 868                 $wgCommandLineMode = true;
 869                 return $settingsFile;
 870         }
 871
 872         /**
 873          * Support function for cleaning up redundant text records
 874          * @param $delete Boolean: whether or not to actually delete the records
 875          * @author Rob Church <robchur@gmail.com>
 876          */
 877         public function purgeRedundantText( $delete = true ) {
 878                 # Data should come off the master, wrapped in a transaction
 879                 $dbw = wfGetDB( DB_MASTER );
 880                 $dbw->begin();
 881
 882                 $tbl_arc = $dbw->tableName( 'archive' );
 883                 $tbl_rev = $dbw->tableName( 'revision' );
 884                 $tbl_txt = $dbw->tableName( 'text' );
 885
 886                 # Get "active" text records from the revisions table
 887                 $this->output( 'Searching for active text records in revisions table...' );
 888                 $res = $dbw->query( "SELECT DISTINCT rev_text_id FROM $tbl_rev" );
 889                 foreach ( $res as $row ) {
 890                         $cur[] = $row->rev_text_id;
 891                 }
 892                 $this->output( "done.\n" );
 893
 894                 # Get "active" text records from the archive table
 895                 $this->output( 'Searching for active text records in archive table...' );
 896                 $res = $dbw->query( "SELECT DISTINCT ar_text_id FROM $tbl_arc" );
 897                 foreach ( $res as $row ) {
 898                         $cur[] = $row->ar_text_id;
 899                 }
 900                 $this->output( "done.\n" );
 901
 902                 # Get the IDs of all text records not in these sets
 903                 $this->output( 'Searching for inactive text records...' );
 904                 $set = implode( ', ', $cur );
 905                 $res = $dbw->query( "SELECT old_id FROM $tbl_txt WHERE old_id NOT IN ( $set )" );
 906                 $old = array();
 907                 foreach ( $res as $row ) {
 908                         $old[] = $row->old_id;
 909                 }
 910                 $this->output( "done.\n" );
 911
 912                 # Inform the user of what we're going to do
 913                 $count = count( $old );
 914                 $this->output( "$count inactive items found.\n" );
 915
 916                 # Delete as appropriate
 917                 if ( $delete && $count ) {
 918                         $this->output( 'Deleting...' );
 919                         $set = implode( ', ', $old );
 920                         $dbw->query( "DELETE FROM $tbl_txt WHERE old_id IN ( $set )" );
 921                         $this->output( "done.\n" );
 922                 }
 923
 924                 # Done
 925                 $dbw->commit();
 926         }
 927
 928         /**
 929          * Get the maintenance directory.
 930          */
 931         protected function getDir() {
 932                 return dirname( __FILE__ );
 933         }
 934
 935         /**
 936          * Get the list of available maintenance scripts. Note
 937          * that if you call this _before_ calling doMaintenance
 938          * you won't have any extensions in it yet
 939          * @return Array
 940          */
 941         public static function getMaintenanceScripts() {
 942                 global $wgMaintenanceScripts;
 943                 return $wgMaintenanceScripts + self::getCoreScripts();
 944         }
 945
 946         /**
 947          * Return all of the core maintenance scripts
 948          * @return array
 949          */
 950         protected static function getCoreScripts() {
 951                 if ( !self::$mCoreScripts ) {
 952                         $paths = array(
 953                                 dirname( __FILE__ ),
 954                                 dirname( __FILE__ ) . '/gearman',
 955                                 dirname( __FILE__ ) . '/language',
 956                                 dirname( __FILE__ ) . '/storage',
 957                         );
 958                         self::$mCoreScripts = array();
 959                         foreach ( $paths as $p ) {
 960                                 $handle = opendir( $p );
 961                                 while ( ( $file = readdir( $handle ) ) !== false ) {
 962                                         if ( $file == 'Maintenance.php' ) {
 963                                                 continue;
 964                                         }
 965                                         $file = $p . '/' . $file;
 966                                         if ( is_dir( $file ) || !strpos( $file, '.php' ) ||
 967                                                 ( strpos( file_get_contents( $file ), '$maintClass' ) === false ) ) {
 968                                                 continue;
 969                                         }
 970                                         require( $file );
 971                                         $vars = get_defined_vars();
 972                                         if ( array_key_exists( 'maintClass', $vars ) ) {
 973                                                 self::$mCoreScripts[$vars['maintClass']] = $file;
 974                                         }
 975                                 }
 976                                 closedir( $handle );
 977                         }
 978                 }
 979                 return self::$mCoreScripts;
 980         }
 981
 982         /**
 983          * Lock the search index
 984          * @param &$db Database object
 985          */
 986         private function lockSearchindex( &$db ) {
 987                 $write = array( 'searchindex' );
 988                 $read = array( 'page', 'revision', 'text', 'interwiki', 'l10n_cache' );
 989                 $db->lockTables( $read, $write, __CLASS__ . '::' . __METHOD__ );
 990         }
 991
 992         /**
 993          * Unlock the tables
 994          * @param &$db Database object
 995          */
 996         private function unlockSearchindex( &$db ) {
 997                 $db->unlockTables(  __CLASS__ . '::' . __METHOD__ );
 998         }
 999
1000         /**
1001          * Unlock and lock again
1002          * Since the lock is low-priority, queued reads will be able to complete
1003          * @param &$db Database object
1004          */
1005         private function relockSearchindex( &$db ) {
1006                 $this->unlockSearchindex( $db );
1007                 $this->lockSearchindex( $db );
1008         }
1009
1010         /**
1011          * Perform a search index update with locking
1012          * @param $maxLockTime Integer: the maximum time to keep the search index locked.
1013          * @param $callback callback String: the function that will update the function.
1014          * @param $dbw Database object
1015          * @param $results
1016          */
1017         public function updateSearchIndex( $maxLockTime, $callback, $dbw, $results ) {
1018                 $lockTime = time();
1019
1020                 # Lock searchindex
1021                 if ( $maxLockTime ) {
1022                         $this->output( "   --- Waiting for lock ---" );
1023                         $this->lockSearchindex( $dbw );
1024                         $lockTime = time();
1025                         $this->output( "\n" );
1026                 }
1027
1028                 # Loop through the results and do a search update
1029                 foreach ( $results as $row ) {
1030                         # Allow reads to be processed
1031                         if ( $maxLockTime && time() > $lockTime + $maxLockTime ) {
1032                                 $this->output( "    --- Relocking ---" );
1033                                 $this->relockSearchindex( $dbw );
1034                                 $lockTime = time();
1035                                 $this->output( "\n" );
1036                         }
1037                         call_user_func( $callback, $dbw, $row );
1038                 }
1039
1040                 # Unlock searchindex
1041                 if ( $maxLockTime ) {
1042                         $this->output( "    --- Unlocking --" );
1043                         $this->unlockSearchindex( $dbw );
1044                         $this->output( "\n" );
1045                 }
1046
1047         }
1048
1049         /**
1050          * Update the searchindex table for a given pageid
1051          * @param $dbw Database: a database write handle
1052          * @param $pageId Integer: the page ID to update.
1053          */
1054         public function updateSearchIndexForPage( $dbw, $pageId ) {
1055                 // Get current revision
1056                 $rev = Revision::loadFromPageId( $dbw, $pageId );
1057                 $title = null;
1058                 if ( $rev ) {
1059                         $titleObj = $rev->getTitle();
1060                         $title = $titleObj->getPrefixedDBkey();
1061                         $this->output( "$title..." );
1062                         # Update searchindex
1063                         $u = new SearchUpdate( $pageId, $titleObj->getText(), $rev->getText() );
1064                         $u->doUpdate();
1065                         $this->output( "\n" );
1066                 }
1067                 return $title;
1068         }
1069
1070         /**
1071          * Prompt the console for input
1072          * @param $prompt String what to begin the line with, like '> '
1073          * @return String response
1074          */
1075         public static function readconsole( $prompt = '> ' ) {
1076                 static $isatty = null;
1077                 if ( is_null( $isatty ) ) {
1078                         $isatty = posix_isatty( 0 /*STDIN*/ );
1079                 }
1080
1081                 if ( $isatty && function_exists( 'readline' ) ) {
1082                         return readline( $prompt );
1083                 } else {
1084                         if ( $isatty ) {
1085                                 $st = self::readlineEmulation( $prompt );
1086                         } else {
1087                                 if ( feof( STDIN ) ) {
1088                                         $st = false;
1089                                 } else {
1090                                         $st = fgets( STDIN, 1024 );
1091                                 }
1092                         }
1093                         if ( $st === false ) return false;
1094                         $resp = trim( $st );
1095                         return $resp;
1096                 }
1097         }
1098
1099         /**
1100          * Emulate readline()
1101          * @param $prompt String what to begin the line with, like '> '
1102          * @return String
1103          */
1104         private static function readlineEmulation( $prompt ) {
1105                 $bash = Installer::locateExecutableInDefaultPaths( array( 'bash' ) );
1106                 if ( !wfIsWindows() && $bash ) {
1107                         $retval = false;
1108                         $encPrompt = wfEscapeShellArg( $prompt );
1109                         $command = "read -er -p $encPrompt && echo \"\$REPLY\"";
1110                         $encCommand = wfEscapeShellArg( $command );
1111                         $line = wfShellExec( "$bash -c $encCommand", $retval );
1112
1113                         if ( $retval == 0 ) {
1114                                 return $line;
1115                         } elseif ( $retval == 127 ) {
1116                                 // Couldn't execute bash even though we thought we saw it.
1117                                 // Shell probably spit out an error message, sorry :(
1118                                 // Fall through to fgets()...
1119                         } else {
1120                                 // EOF/ctrl+D
1121                                 return false;
1122                         }
1123                 }
1124
1125                 // Fallback... we'll have no editing controls, EWWW
1126                 if ( feof( STDIN ) ) {
1127                         return false;
1128                 }
1129                 print $prompt;
1130                 return fgets( STDIN, 1024 );
1131         }
1132 }
1133
1134 class FakeMaintenance extends Maintenance {
1135         protected $mSelf = "FakeMaintenanceScript";
1136         public function execute() {
1137                 return;
1138         }
1139 }
1140