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 ( !function_exists( 'version_compare' ) || version_compare( PHP_VERSION, '5.2.3' ) < 0 ) {
  31         require_once( dirname( __FILE__ ) . '/../includes/PHPVersionError.php' );
  32         wfPHPVersionError( 'cli' );
  33 }
  34
  35 /**
  36  * Abstract maintenance class for quickly writing and churning out
  37  * maintenance scripts with minimal effort. All that _must_ be defined
  38  * is the execute() method. See docs/maintenance.txt for more info
  39  * and a quick demo of how to use it.
  40  *
  41  * @author Chad Horohoe <chad@anyonecanedit.org>
  42  * @since 1.16
  43  * @ingroup Maintenance
  44  */
  45 abstract class Maintenance {
  46
  47         /**
  48          * Constants for DB access type
  49          * @see Maintenance::getDbType()
  50          */
  51         const DB_NONE  = 0;
  52         const DB_STD   = 1;
  53         const DB_ADMIN = 2;
  54
  55         // Const for getStdin()
  56         const STDIN_ALL = 'all';
  57
  58         // This is the desired params
  59         protected $mParams = array();
  60
  61         // Array of mapping short parameters to long ones
  62         protected $mShortParamsMap = array();
  63
  64         // Array of desired args
  65         protected $mArgList = array();
  66
  67         // This is the list of options that were actually passed
  68         protected $mOptions = array();
  69
  70         // This is the list of arguments that were actually passed
  71         protected $mArgs = array();
  72
  73         // Name of the script currently running
  74         protected $mSelf;
  75
  76         // Special vars for params that are always used
  77         protected $mQuiet = false;
  78         protected $mDbUser, $mDbPass;
  79
  80         // A description of the script, children should change this
  81         protected $mDescription = '';
  82
  83         // Have we already loaded our user input?
  84         protected $mInputLoaded = false;
  85
  86         /**
  87          * Batch size. If a script supports this, they should set
  88          * a default with setBatchSize()
  89          *
  90          * @var int
  91          */
  92         protected $mBatchSize = null;
  93
  94         // Generic options added by addDefaultParams()
  95         private $mGenericParameters = array();
  96         // Generic options which might or not be supported by the script
  97         private $mDependantParameters = array();
  98
  99         // Used by getDD() / setDB()
 100         private $mDb = null;
 101
 102         /**
 103          * List of all the core maintenance scripts. This is added
 104          * to scripts added by extensions in $wgMaintenanceScripts
 105          * and returned by getMaintenanceScripts()
 106          */
 107         protected static $mCoreScripts = null;
 108
 109         /**
 110          * Default constructor. Children should call this *first* if implementing
 111          * their own constructors
 112          */
 113         public function __construct() {
 114                 // Setup $IP, using MW_INSTALL_PATH if it exists
 115                 global $IP;
 116                 $IP = strval( getenv( 'MW_INSTALL_PATH' ) ) !== ''
 117                         ? getenv( 'MW_INSTALL_PATH' )
 118                         : realpath( dirname( __FILE__ ) . '/..' );
 119
 120                 $this->addDefaultParams();
 121                 register_shutdown_function( array( $this, 'outputChanneled' ), false );
 122         }
 123
 124         /**
 125          * Should we execute the maintenance script, or just allow it to be included
 126          * as a standalone class? It checks that the call stack only includes this
 127          * function and "requires" (meaning was called from the file scope)
 128          *
 129          * @return Boolean
 130          */
 131         public static function shouldExecute() {
 132                 $bt = debug_backtrace();
 133                 $count = count( $bt );
 134                 if ( $count < 2 ) {
 135                         return false; // sanity
 136                 }
 137                 if ( $bt[0]['class'] !== 'Maintenance' || $bt[0]['function'] !== 'shouldExecute' ) {
 138                         return false; // last call should be to this function
 139                 }
 140                 $includeFuncs = array( 'require_once', 'require', 'include', 'include_once' );
 141                 for( $i=1; $i < $count; $i++ ) {
 142                         if ( !in_array( $bt[$i]['function'], $includeFuncs ) ) {
 143                                 return false; // previous calls should all be "requires"
 144                         }
 145                 }
 146                 return true;
 147         }
 148
 149         /**
 150          * Do the actual work. All child classes will need to implement this
 151          */
 152         abstract public function execute();
 153
 154         /**
 155          * Add a parameter to the script. Will be displayed on --help
 156          * with the associated description
 157          *
 158          * @param $name String: the name of the param (help, version, etc)
 159          * @param $description String: the description of the param to show on --help
 160          * @param $required Boolean: is the param required?
 161          * @param $withArg Boolean: is an argument required with this option?
 162          * @param $shortName String: character to use as short name
 163          */
 164         protected function addOption( $name, $description, $required = false, $withArg = false, $shortName = false ) {
 165                 $this->mParams[$name] = array( 'desc' => $description, 'require' => $required, 'withArg' => $withArg, 'shortName' => $shortName );
 166                 if ( $shortName !== false ) {
 167                         $this->mShortParamsMap[$shortName] = $name;
 168                 }
 169         }
 170
 171         /**
 172          * Checks to see if a particular param exists.
 173          * @param $name String: the name of the param
 174          * @return Boolean
 175          */
 176         protected function hasOption( $name ) {
 177                 return isset( $this->mOptions[$name] );
 178         }
 179
 180         /**
 181          * Get an option, or return the default
 182          * @param $name String: the name of the param
 183          * @param $default Mixed: anything you want, default null
 184          * @return Mixed
 185          */
 186         protected function getOption( $name, $default = null ) {
 187                 if ( $this->hasOption( $name ) ) {
 188                         return $this->mOptions[$name];
 189                 } else {
 190                         // Set it so we don't have to provide the default again
 191                         $this->mOptions[$name] = $default;
 192                         return $this->mOptions[$name];
 193                 }
 194         }
 195
 196         /**
 197          * Add some args that are needed
 198          * @param $arg String: name of the arg, like 'start'
 199          * @param $description String: short description of the arg
 200          * @param $required Boolean: is this required?
 201          */
 202         protected function addArg( $arg, $description, $required = true ) {
 203                 $this->mArgList[] = array(
 204                         'name' => $arg,
 205                         'desc' => $description,
 206                         'require' => $required
 207                 );
 208         }
 209
 210         /**
 211          * Remove an option.  Useful for removing options that won't be used in your script.
 212          * @param $name String: the option to remove.
 213          */
 214         protected function deleteOption( $name ) {
 215                 unset( $this->mParams[$name] );
 216         }
 217
 218         /**
 219          * Set the description text.
 220          * @param $text String: the text of the description
 221          */
 222         protected function addDescription( $text ) {
 223                 $this->mDescription = $text;
 224         }
 225
 226         /**
 227          * Does a given argument exist?
 228          * @param $argId Integer: the integer value (from zero) for the arg
 229          * @return Boolean
 230          */
 231         protected function hasArg( $argId = 0 ) {
 232                 return isset( $this->mArgs[$argId] );
 233         }
 234
 235         /**
 236          * Get an argument.
 237          * @param $argId Integer: the integer value (from zero) for the arg
 238          * @param $default Mixed: the default if it doesn't exist
 239          * @return mixed
 240          */
 241         protected function getArg( $argId = 0, $default = null ) {
 242                 return $this->hasArg( $argId ) ? $this->mArgs[$argId] : $default;
 243         }
 244
 245         /**
 246          * Set the batch size.
 247          * @param $s Integer: the number of operations to do in a batch
 248          */
 249         protected function setBatchSize( $s = 0 ) {
 250                 $this->mBatchSize = $s;
 251
 252                 // If we support $mBatchSize, show the option.
 253                 // Used to be in addDefaultParams, but in order for that to
 254                 // work, subclasses would have to call this function in the constructor
 255                 // before they called parent::__construct which is just weird
 256                 // (and really wasn't done).
 257                 if ( $this->mBatchSize ) {
 258                         $this->addOption( 'batch-size', 'Run this many operations ' .
 259                                 'per batch, default: ' . $this->mBatchSize, false, true );
 260                         if ( isset( $this->mParams['batch-size'] ) ) {
 261                                 // This seems a little ugly...
 262                                 $this->mDependantParameters['batch-size'] = $this->mParams['batch-size'];
 263                         }
 264                 }
 265         }
 266
 267         /**
 268          * Get the script's name
 269          * @return String
 270          */
 271         public function getName() {
 272                 return $this->mSelf;
 273         }
 274
 275         /**
 276          * Return input from stdin.
 277          * @param $len Integer: the number of bytes to read. If null,
 278          *        just return the handle. Maintenance::STDIN_ALL returns
 279          *        the full length
 280          * @return Mixed
 281          */
 282         protected function getStdin( $len = null ) {
 283                 if ( $len == Maintenance::STDIN_ALL ) {
 284                         return file_get_contents( 'php://stdin' );
 285                 }
 286                 $f = fopen( 'php://stdin', 'rt' );
 287                 if ( !$len ) {
 288                         return $f;
 289                 }
 290                 $input = fgets( $f, $len );
 291                 fclose( $f );
 292                 return rtrim( $input );
 293         }
 294
 295         public function isQuiet() {
 296                 return $this->mQuiet;
 297         }
 298
 299         /**
 300          * Throw some output to the user. Scripts can call this with no fears,
 301          * as we handle all --quiet stuff here
 302          * @param $out String: the text to show to the user
 303          * @param $channel Mixed: unique identifier for the channel. See
 304          *     function outputChanneled.
 305          */
 306         protected function output( $out, $channel = null ) {
 307                 if ( $this->mQuiet ) {
 308                         return;
 309                 }
 310                 if ( $channel === null ) {
 311                         $this->cleanupChanneled();
 312                         if( php_sapi_name() == 'cli' ) {
 313                                 fwrite( STDOUT, $out );
 314                         } else {
 315                                 print( $out );
 316                         }
 317                 } else {
 318                         $out = preg_replace( '/\n\z/', '', $out );
 319                         $this->outputChanneled( $out, $channel );
 320                 }
 321         }
 322
 323         /**
 324          * Throw an error to the user. Doesn't respect --quiet, so don't use
 325          * this for non-error output
 326          * @param $err String: the error to display
 327          * @param $die Int: if > 0, go ahead and die out using this int as the code
 328          */
 329         protected function error( $err, $die = 0 ) {
 330                 $this->outputChanneled( false );
 331                 if ( php_sapi_name() == 'cli' ) {
 332                         fwrite( STDERR, $err . "\n" );
 333                 } else {
 334                         print $err;
 335                 }
 336                 $die = intval( $die );
 337                 if ( $die > 0 ) {
 338                         die( $die );
 339                 }
 340         }
 341
 342         private $atLineStart = true;
 343         private $lastChannel = null;
 344
 345         /**
 346          * Clean up channeled output.  Output a newline if necessary.
 347          */
 348         public function cleanupChanneled() {
 349                 if ( !$this->atLineStart ) {
 350                         if( php_sapi_name() == 'cli' ) {
 351                                 fwrite( STDOUT, "\n" );
 352                         } else {
 353                                 print "\n";
 354                         }
 355                         $this->atLineStart = true;
 356                 }
 357         }
 358
 359         /**
 360          * Message outputter with channeled message support. Messages on the
 361          * same channel are concatenated, but any intervening messages in another
 362          * channel start a new line.
 363          * @param $msg String: the message without trailing newline
 364          * @param $channel Channel identifier or null for no
 365          *     channel. Channel comparison uses ===.
 366          */
 367         public function outputChanneled( $msg, $channel = null ) {
 368                 if ( $msg === false ) {
 369                         $this->cleanupChanneled();
 370                         return;
 371                 }
 372
 373                 $cli = php_sapi_name() == 'cli';
 374
 375                 // End the current line if necessary
 376                 if ( !$this->atLineStart && $channel !== $this->lastChannel ) {
 377                         if( $cli ) {
 378                                 fwrite( STDOUT, "\n" );
 379                         } else {
 380                                 print "\n";
 381                         }
 382                 }
 383
 384                 if( $cli ) {
 385                         fwrite( STDOUT, $msg );
 386                 } else {
 387                         print $msg;
 388                 }
 389
 390                 $this->atLineStart = false;
 391                 if ( $channel === null ) {
 392                         // For unchanneled messages, output trailing newline immediately
 393                         if( $cli ) {
 394                                 fwrite( STDOUT, "\n" );
 395                         } else {
 396                                 print "\n";
 397                         }
 398                         $this->atLineStart = true;
 399                 }
 400                 $this->lastChannel = $channel;
 401         }
 402
 403         /**
 404          * Does the script need different DB access? By default, we give Maintenance
 405          * scripts normal rights to the DB. Sometimes, a script needs admin rights
 406          * access for a reason and sometimes they want no access. Subclasses should
 407          * override and return one of the following values, as needed:
 408          *    Maintenance::DB_NONE  -  For no DB access at all
 409          *    Maintenance::DB_STD   -  For normal DB access, default
 410          *    Maintenance::DB_ADMIN -  For admin DB access
 411          * @return Integer
 412          */
 413         public function getDbType() {
 414                 return Maintenance::DB_STD;
 415         }
 416
 417         /**
 418          * Add the default parameters to the scripts
 419          */
 420         protected function addDefaultParams() {
 421
 422                 # Generic (non script dependant) options:
 423
 424                 $this->addOption( 'help', 'Display this help message', false, false, 'h' );
 425                 $this->addOption( 'quiet', 'Whether to supress non-error output', false, false, 'q' );
 426                 $this->addOption( 'conf', 'Location of LocalSettings.php, if not default', false, true );
 427                 $this->addOption( 'wiki', 'For specifying the wiki ID', false, true );
 428                 $this->addOption( 'globals', 'Output globals at the end of processing for debugging' );
 429                 $this->addOption( 'memory-limit', 'Set a specific memory limit for the script, "max" for no limit or "default" to avoid changing it' );
 430                 $this->addOption( 'server', "The protocol and server name to use in URLs, e.g. " .
 431                                 "http://en.wikipedia.org. This is sometimes necessary because " .
 432                                 "server name detection may fail in command line scripts.", false, true );
 433
 434                 # Save generic options to display them separately in help
 435                 $this->mGenericParameters = $this->mParams ;
 436
 437                 # Script dependant options:
 438
 439                 // If we support a DB, show the options
 440                 if ( $this->getDbType() > 0 ) {
 441                         $this->addOption( 'dbuser', 'The DB user to use for this script', false, true );
 442                         $this->addOption( 'dbpass', 'The password to use for this script', false, true );
 443                 }
 444
 445                 # Save additional script dependant options to display
 446                 # them separately in help
 447                 $this->mDependantParameters = array_diff_key( $this->mParams, $this->mGenericParameters );
 448         }
 449
 450         /**
 451          * Run a child maintenance script. Pass all of the current arguments
 452          * to it.
 453          * @param $maintClass String: a name of a child maintenance class
 454          * @param $classFile String: full path of where the child is
 455          * @return Maintenance child
 456          */
 457         public function runChild( $maintClass, $classFile = null ) {
 458                 // Make sure the class is loaded first
 459                 if ( !MWInit::classExists( $maintClass ) ) {
 460                         if ( $classFile ) {
 461                                 require_once( $classFile );
 462                         }
 463                         if ( !MWInit::classExists( $maintClass ) ) {
 464                                 $this->error( "Cannot spawn child: $maintClass" );
 465                         }
 466                 }
 467
 468                 /**
 469                  * @var $child Maintenance
 470                  */
 471                 $child = new $maintClass();
 472                 $child->loadParamsAndArgs( $this->mSelf, $this->mOptions, $this->mArgs );
 473                 if ( !is_null( $this->mDb ) ) {
 474                         $child->setDB( $this->mDb );
 475                 }
 476                 return $child;
 477         }
 478
 479         /**
 480          * Do some sanity checking and basic setup
 481          */
 482         public function setup() {
 483                 global $wgCommandLineMode, $wgRequestTime;
 484
 485                 # Abort if called from a web server
 486                 if ( isset( $_SERVER ) && isset( $_SERVER['REQUEST_METHOD'] ) ) {
 487                         $this->error( 'This script must be run from the command line', true );
 488                 }
 489
 490                 # Make sure we can handle script parameters
 491                 if ( !function_exists( 'hphp_thread_set_warmup_enabled' ) && !ini_get( 'register_argc_argv' ) ) {
 492                         $this->error( 'Cannot get command line arguments, register_argc_argv is set to false', true );
 493                 }
 494
 495                 if ( version_compare( phpversion(), '5.2.4' ) >= 0 ) {
 496                         // Send PHP warnings and errors to stderr instead of stdout.
 497                         // This aids in diagnosing problems, while keeping messages
 498                         // out of redirected output.
 499                         if ( ini_get( 'display_errors' ) ) {
 500                                 ini_set( 'display_errors', 'stderr' );
 501                         }
 502
 503                         // Don't touch the setting on earlier versions of PHP,
 504                         // as setting it would disable output if you'd wanted it.
 505
 506                         // Note that exceptions are also sent to stderr when
 507                         // command-line mode is on, regardless of PHP version.
 508                 }
 509
 510                 $this->loadParamsAndArgs();
 511                 $this->maybeHelp();
 512
 513                 # Set the memory limit
 514                 # Note we need to set it again later in cache LocalSettings changed it
 515                 $this->adjustMemoryLimit();
 516
 517                 # Set max execution time to 0 (no limit). PHP.net says that
 518                 # "When running PHP from the command line the default setting is 0."
 519                 # But sometimes this doesn't seem to be the case.
 520                 ini_set( 'max_execution_time', 0 );
 521
 522                 $wgRequestTime = microtime( true );
 523
 524                 # Define us as being in MediaWiki
 525                 define( 'MEDIAWIKI', true );
 526
 527                 $wgCommandLineMode = true;
 528                 # Turn off output buffering if it's on
 529                 @ob_end_flush();
 530
 531                 $this->validateParamsAndArgs();
 532         }
 533
 534         /**
 535          * Normally we disable the memory_limit when running admin scripts.
 536          * Some scripts may wish to actually set a limit, however, to avoid
 537          * blowing up unexpectedly. We also support a --memory-limit option,
 538          * to allow sysadmins to explicitly set one if they'd prefer to override
 539          * defaults (or for people using Suhosin which yells at you for trying
 540          * to disable the limits)
 541          * @return string
 542          */
 543         public function memoryLimit() {
 544                 $limit = $this->getOption( 'memory-limit', 'max' );
 545                 $limit = trim( $limit, "\" '" ); // trim quotes in case someone misunderstood
 546                 return $limit;
 547         }
 548
 549         /**
 550          * Adjusts PHP's memory limit to better suit our needs, if needed.
 551          */
 552         protected function adjustMemoryLimit() {
 553                 $limit = $this->memoryLimit();
 554                 if ( $limit == 'max' ) {
 555                         $limit = -1; // no memory limit
 556                 }
 557                 if ( $limit != 'default' ) {
 558                         ini_set( 'memory_limit', $limit );
 559                 }
 560         }
 561
 562         /**
 563          * Clear all params and arguments.
 564          */
 565         public function clearParamsAndArgs() {
 566                 $this->mOptions = array();
 567                 $this->mArgs = array();
 568                 $this->mInputLoaded = false;
 569         }
 570
 571         /**
 572          * Process command line arguments
 573          * $mOptions becomes an array with keys set to the option names
 574          * $mArgs becomes a zero-based array containing the non-option arguments
 575          *
 576          * @param $self String The name of the script, if any
 577          * @param $opts Array An array of options, in form of key=>value
 578          * @param $args Array An array of command line arguments
 579          */
 580         public function loadParamsAndArgs( $self = null, $opts = null, $args = null ) {
 581                 # If we were given opts or args, set those and return early
 582                 if ( $self ) {
 583                         $this->mSelf = $self;
 584                         $this->mInputLoaded = true;
 585                 }
 586                 if ( $opts ) {
 587                         $this->mOptions = $opts;
 588                         $this->mInputLoaded = true;
 589                 }
 590                 if ( $args ) {
 591                         $this->mArgs = $args;
 592                         $this->mInputLoaded = true;
 593                 }
 594
 595                 # If we've already loaded input (either by user values or from $argv)
 596                 # skip on loading it again. The array_shift() will corrupt values if
 597                 # it's run again and again
 598                 if ( $this->mInputLoaded ) {
 599                         $this->loadSpecialVars();
 600                         return;
 601                 }
 602
 603                 global $argv;
 604                 $this->mSelf = array_shift( $argv );
 605
 606                 $options = array();
 607                 $args = array();
 608
 609                 # Parse arguments
 610                 for ( $arg = reset( $argv ); $arg !== false; $arg = next( $argv ) ) {
 611                         if ( $arg == '--' ) {
 612                                 # End of options, remainder should be considered arguments
 613                                 $arg = next( $argv );
 614                                 while ( $arg !== false ) {
 615                                         $args[] = $arg;
 616                                         $arg = next( $argv );
 617                                 }
 618                                 break;
 619                         } elseif ( substr( $arg, 0, 2 ) == '--' ) {
 620                                 # Long options
 621                                 $option = substr( $arg, 2 );
 622                                 if ( array_key_exists( $option, $options ) ) {
 623                                         $this->error( "\nERROR: $option parameter given twice\n" );
 624                                         $this->maybeHelp( true );
 625                                 }
 626                                 if ( isset( $this->mParams[$option] ) && $this->mParams[$option]['withArg'] ) {
 627                                         $param = next( $argv );
 628                                         if ( $param === false ) {
 629                                                 $this->error( "\nERROR: $option parameter needs a value after it\n" );
 630                                                 $this->maybeHelp( true );
 631                                         }
 632                                         $options[$option] = $param;
 633                                 } else {
 634                                         $bits = explode( '=', $option, 2 );
 635                                         if ( count( $bits ) > 1 ) {
 636                                                 $option = $bits[0];
 637                                                 $param = $bits[1];
 638                                         } else {
 639                                                 $param = 1;
 640                                         }
 641                                         $options[$option] = $param;
 642                                 }
 643                         } elseif ( substr( $arg, 0, 1 ) == '-' ) {
 644                                 # Short options
 645                                 for ( $p = 1; $p < strlen( $arg ); $p++ ) {
 646                                         $option = $arg { $p } ;
 647                                         if ( !isset( $this->mParams[$option] ) && isset( $this->mShortParamsMap[$option] ) ) {
 648                                                 $option = $this->mShortParamsMap[$option];
 649                                         }
 650                                         if ( array_key_exists( $option, $options ) ) {
 651                                                 $this->error( "\nERROR: $option parameter given twice\n" );
 652                                                 $this->maybeHelp( true );
 653                                         }
 654                                         if ( isset( $this->mParams[$option]['withArg'] ) && $this->mParams[$option]['withArg'] ) {
 655                                                 $param = next( $argv );
 656                                                 if ( $param === false ) {
 657                                                         $this->error( "\nERROR: $option parameter needs a value after it\n" );
 658                                                         $this->maybeHelp( true );
 659                                                 }
 660                                                 $options[$option] = $param;
 661                                         } else {
 662                                                 $options[$option] = 1;
 663                                         }
 664                                 }
 665                         } else {
 666                                 $args[] = $arg;
 667                         }
 668                 }
 669
 670                 $this->mOptions = $options;
 671                 $this->mArgs = $args;
 672                 $this->loadSpecialVars();
 673                 $this->mInputLoaded = true;
 674         }
 675
 676         /**
 677          * Run some validation checks on the params, etc
 678          */
 679         protected function validateParamsAndArgs() {
 680                 $die = false;
 681                 # Check to make sure we've got all the required options
 682                 foreach ( $this->mParams as $opt => $info ) {
 683                         if ( $info['require'] && !$this->hasOption( $opt ) ) {
 684                                 $this->error( "Param $opt required!" );
 685                                 $die = true;
 686                         }
 687                 }
 688                 # Check arg list too
 689                 foreach ( $this->mArgList as $k => $info ) {
 690                         if ( $info['require'] && !$this->hasArg( $k ) ) {
 691                                 $this->error( 'Argument <' . $info['name'] . '> required!' );
 692                                 $die = true;
 693                         }
 694                 }
 695
 696                 if ( $die ) {
 697                         $this->maybeHelp( true );
 698                 }
 699         }
 700
 701         /**
 702          * Handle the special variables that are global to all scripts
 703          */
 704         protected function loadSpecialVars() {
 705                 if ( $this->hasOption( 'dbuser' ) ) {
 706                         $this->mDbUser = $this->getOption( 'dbuser' );
 707                 }
 708                 if ( $this->hasOption( 'dbpass' ) ) {
 709                         $this->mDbPass = $this->getOption( 'dbpass' );
 710                 }
 711                 if ( $this->hasOption( 'quiet' ) ) {
 712                         $this->mQuiet = true;
 713                 }
 714                 if ( $this->hasOption( 'batch-size' ) ) {
 715                         $this->mBatchSize = intval( $this->getOption( 'batch-size' ) );
 716                 }
 717         }
 718
 719         /**
 720          * Maybe show the help.
 721          * @param $force boolean Whether to force the help to show, default false
 722          */
 723         protected function maybeHelp( $force = false ) {
 724                 if( !$force && !$this->hasOption( 'help' ) ) {
 725                         return;
 726                 }
 727
 728                 $screenWidth = 80; // TODO: Caculate this!
 729                 $tab = "    ";
 730                 $descWidth = $screenWidth - ( 2 * strlen( $tab ) );
 731
 732                 ksort( $this->mParams );
 733                 $this->mQuiet = false;
 734
 735                 // Description ...
 736                 if ( $this->mDescription ) {
 737                         $this->output( "\n" . $this->mDescription . "\n" );
 738                 }
 739                 $output = "\nUsage: php " . basename( $this->mSelf );
 740
 741                 // ... append parameters ...
 742                 if ( $this->mParams ) {
 743                         $output .= " [--" . implode( array_keys( $this->mParams ), "|--" ) . "]";
 744                 }
 745
 746                 // ... and append arguments.
 747                 if ( $this->mArgList ) {
 748                         $output .= ' ';
 749                         foreach ( $this->mArgList as $k => $arg ) {
 750                                 if ( $arg['require'] ) {
 751                                         $output .= '<' . $arg['name'] . '>';
 752                                 } else {
 753                                         $output .= '[' . $arg['name'] . ']';
 754                                 }
 755                                 if ( $k < count( $this->mArgList ) - 1 )
 756                                         $output .= ' ';
 757                         }
 758                 }
 759                 $this->output( "$output\n\n" );
 760
 761                 # TODO abstract some repetitive code below
 762
 763                 // Generic parameters
 764                 $this->output( "Generic maintenance parameters:\n" );
 765                 foreach ( $this->mGenericParameters as $par => $info ) {
 766                         if ( $info['shortName'] !== false ) {
 767                                 $par .= " (-{$info['shortName']})";
 768                         }
 769                         $this->output(
 770                                 wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 771                                                 "\n$tab$tab" ) . "\n"
 772                         );
 773                 }
 774                 $this->output( "\n" );
 775
 776                 $scriptDependantParams = $this->mDependantParameters;
 777                 if( count($scriptDependantParams) > 0 ) {
 778                         $this->output( "Script dependant parameters:\n" );
 779                         // Parameters description
 780                         foreach ( $scriptDependantParams as $par => $info ) {
 781                                 if ( $info['shortName'] !== false ) {
 782                                         $par .= " (-{$info['shortName']})";
 783                                 }
 784                                 $this->output(
 785                                         wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 786                                                         "\n$tab$tab" ) . "\n"
 787                                 );
 788                         }
 789                         $this->output( "\n" );
 790                 }
 791
 792
 793                 // Script specific parameters not defined on construction by
 794                 // Maintenance::addDefaultParams()
 795                 $scriptSpecificParams = array_diff_key(
 796                         # all script parameters:
 797                         $this->mParams,
 798                         # remove the Maintenance default parameters:
 799                         $this->mGenericParameters,
 800                         $this->mDependantParameters
 801                 );
 802                 if( count($scriptSpecificParams) > 0 ) {
 803                         $this->output( "Script specific parameters:\n" );
 804                         // Parameters description
 805                         foreach ( $scriptSpecificParams as $par => $info ) {
 806                                 if ( $info['shortName'] !== false ) {
 807                                         $par .= " (-{$info['shortName']})";
 808                                 }
 809                                 $this->output(
 810                                         wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 811                                                         "\n$tab$tab" ) . "\n"
 812                                 );
 813                         }
 814                         $this->output( "\n" );
 815                 }
 816
 817                 // Print arguments
 818                 if( count( $this->mArgList ) > 0 ) {
 819                         $this->output( "Arguments:\n" );
 820                         // Arguments description
 821                         foreach ( $this->mArgList as $info ) {
 822                                 $openChar = $info['require'] ? '<' : '[';
 823                                 $closeChar = $info['require'] ? '>' : ']';
 824                                 $this->output(
 825                                         wordwrap( "$tab$openChar" . $info['name'] . "$closeChar: " .
 826                                                 $info['desc'], $descWidth, "\n$tab$tab" ) . "\n"
 827                                 );
 828                         }
 829                         $this->output( "\n" );
 830                 }
 831
 832                 die( 1 );
 833         }
 834
 835         /**
 836          * Handle some last-minute setup here.
 837          */
 838         public function finalSetup() {
 839                 global $wgCommandLineMode, $wgShowSQLErrors, $wgServer;
 840                 global $wgDBadminuser, $wgDBadminpassword;
 841                 global $wgDBuser, $wgDBpassword, $wgDBservers, $wgLBFactoryConf;
 842
 843                 # Turn off output buffering again, it might have been turned on in the settings files
 844                 if ( ob_get_level() ) {
 845                         ob_end_flush();
 846                 }
 847                 # Same with these
 848                 $wgCommandLineMode = true;
 849
 850                 # Override $wgServer
 851                 if( $this->hasOption( 'server') ) {
 852                         $wgServer = $this->getOption( 'server', $wgServer );
 853                 }
 854
 855                 # If these were passed, use them
 856                 if ( $this->mDbUser ) {
 857                         $wgDBadminuser = $this->mDbUser;
 858                 }
 859                 if ( $this->mDbPass ) {
 860                         $wgDBadminpassword = $this->mDbPass;
 861                 }
 862
 863                 if ( $this->getDbType() == self::DB_ADMIN && isset( $wgDBadminuser ) ) {
 864                         $wgDBuser = $wgDBadminuser;
 865                         $wgDBpassword = $wgDBadminpassword;
 866
 867                         if ( $wgDBservers ) {
 868                                 /**
 869                                  * @var $wgDBservers array
 870                                  */
 871                                 foreach ( $wgDBservers as $i => $server ) {
 872                                         $wgDBservers[$i]['user'] = $wgDBuser;
 873                                         $wgDBservers[$i]['password'] = $wgDBpassword;
 874                                 }
 875                         }
 876                         if ( isset( $wgLBFactoryConf['serverTemplate'] ) ) {
 877                                 $wgLBFactoryConf['serverTemplate']['user'] = $wgDBuser;
 878                                 $wgLBFactoryConf['serverTemplate']['password'] = $wgDBpassword;
 879                         }
 880                         LBFactory::destroyInstance();
 881                 }
 882
 883                 $this->afterFinalSetup();
 884
 885                 $wgShowSQLErrors = true;
 886                 @set_time_limit( 0 );
 887                 $this->adjustMemoryLimit();
 888         }
 889
 890         /**
 891          * Execute a callback function at the end of initialisation
 892          */
 893         protected function afterFinalSetup() {
 894                 if ( defined( 'MW_CMDLINE_CALLBACK' ) ) {
 895                         call_user_func( MW_CMDLINE_CALLBACK );
 896                 }
 897         }
 898
 899         /**
 900          * Potentially debug globals. Originally a feature only
 901          * for refreshLinks
 902          */
 903         public function globals() {
 904                 if ( $this->hasOption( 'globals' ) ) {
 905                         print_r( $GLOBALS );
 906                 }
 907         }
 908
 909         /**
 910          * Generic setup for most installs. Returns the location of LocalSettings
 911          * @return String
 912          */
 913         public function loadSettings() {
 914                 global $wgCommandLineMode, $IP;
 915
 916                 if ( isset( $this->mOptions['conf'] ) ) {
 917                         $settingsFile = $this->mOptions['conf'];
 918                 } elseif ( defined("MW_CONFIG_FILE") ) {
 919                         $settingsFile = MW_CONFIG_FILE;
 920                 } else {
 921                         $settingsFile = "$IP/LocalSettings.php";
 922                 }
 923                 if ( isset( $this->mOptions['wiki'] ) ) {
 924                         $bits = explode( '-', $this->mOptions['wiki'] );
 925                         if ( count( $bits ) == 1 ) {
 926                                 $bits[] = '';
 927                         }
 928                         define( 'MW_DB', $bits[0] );
 929                         define( 'MW_PREFIX', $bits[1] );
 930                 }
 931
 932                 if ( !is_readable( $settingsFile ) ) {
 933                         $this->error( "A copy of your installation's LocalSettings.php\n" .
 934                                                 "must exist and be readable in the source directory.\n" .
 935                                                 "Use --conf to specify it." , true );
 936                 }
 937                 $wgCommandLineMode = true;
 938                 return $settingsFile;
 939         }
 940
 941         /**
 942          * Support function for cleaning up redundant text records
 943          * @param $delete Boolean: whether or not to actually delete the records
 944          * @author Rob Church <robchur@gmail.com>
 945          */
 946         public function purgeRedundantText( $delete = true ) {
 947                 # Data should come off the master, wrapped in a transaction
 948                 $dbw = $this->getDB( DB_MASTER );
 949                 $dbw->begin();
 950
 951                 $tbl_arc = $dbw->tableName( 'archive' );
 952                 $tbl_rev = $dbw->tableName( 'revision' );
 953                 $tbl_txt = $dbw->tableName( 'text' );
 954
 955                 # Get "active" text records from the revisions table
 956                 $this->output( 'Searching for active text records in revisions table...' );
 957                 $res = $dbw->query( "SELECT DISTINCT rev_text_id FROM $tbl_rev" );
 958                 foreach ( $res as $row ) {
 959                         $cur[] = $row->rev_text_id;
 960                 }
 961                 $this->output( "done.\n" );
 962
 963                 # Get "active" text records from the archive table
 964                 $this->output( 'Searching for active text records in archive table...' );
 965                 $res = $dbw->query( "SELECT DISTINCT ar_text_id FROM $tbl_arc" );
 966                 foreach ( $res as $row ) {
 967                         $cur[] = $row->ar_text_id;
 968                 }
 969                 $this->output( "done.\n" );
 970
 971                 # Get the IDs of all text records not in these sets
 972                 $this->output( 'Searching for inactive text records...' );
 973                 $set = implode( ', ', $cur );
 974                 $res = $dbw->query( "SELECT old_id FROM $tbl_txt WHERE old_id NOT IN ( $set )" );
 975                 $old = array();
 976                 foreach ( $res as $row ) {
 977                         $old[] = $row->old_id;
 978                 }
 979                 $this->output( "done.\n" );
 980
 981                 # Inform the user of what we're going to do
 982                 $count = count( $old );
 983                 $this->output( "$count inactive items found.\n" );
 984
 985                 # Delete as appropriate
 986                 if ( $delete && $count ) {
 987                         $this->output( 'Deleting...' );
 988                         $set = implode( ', ', $old );
 989                         $dbw->query( "DELETE FROM $tbl_txt WHERE old_id IN ( $set )" );
 990                         $this->output( "done.\n" );
 991                 }
 992
 993                 # Done
 994                 $dbw->commit();
 995         }
 996
 997         /**
 998          * Get the maintenance directory.
 999          * @return string
1000          */
1001         protected function getDir() {
1002                 return dirname( __FILE__ );
1003         }
1004
1005         /**
1006          * Get the list of available maintenance scripts. Note
1007          * that if you call this _before_ calling doMaintenance
1008          * you won't have any extensions in it yet
1009          * @return Array
1010          */
1011         public static function getMaintenanceScripts() {
1012                 global $wgMaintenanceScripts;
1013                 return $wgMaintenanceScripts + self::getCoreScripts();
1014         }
1015
1016         /**
1017          * Return all of the core maintenance scripts
1018          * @return array
1019          */
1020         protected static function getCoreScripts() {
1021                 if ( !self::$mCoreScripts ) {
1022                         $paths = array(
1023                                 dirname( __FILE__ ),
1024                                 dirname( __FILE__ ) . '/gearman',
1025                                 dirname( __FILE__ ) . '/language',
1026                                 dirname( __FILE__ ) . '/storage',
1027                         );
1028                         self::$mCoreScripts = array();
1029                         foreach ( $paths as $p ) {
1030                                 $handle = opendir( $p );
1031                                 while ( ( $file = readdir( $handle ) ) !== false ) {
1032                                         if ( $file == 'Maintenance.php' ) {
1033                                                 continue;
1034                                         }
1035                                         $file = $p . '/' . $file;
1036                                         if ( is_dir( $file ) || !strpos( $file, '.php' ) ||
1037                                                 ( strpos( file_get_contents( $file ), '$maintClass' ) === false ) ) {
1038                                                 continue;
1039                                         }
1040                                         require( $file );
1041                                         $vars = get_defined_vars();
1042                                         if ( array_key_exists( 'maintClass', $vars ) ) {
1043                                                 self::$mCoreScripts[$vars['maintClass']] = $file;
1044                                         }
1045                                 }
1046                                 closedir( $handle );
1047                         }
1048                 }
1049                 return self::$mCoreScripts;
1050         }
1051
1052         /**
1053          * Returns a database to be used by current maintenance script. It can be set by setDB().
1054          * If not set, wfGetDB() will be used.
1055          * This function has the same parameters as wfGetDB()
1056          *
1057          * @return DatabaseBase
1058          */
1059         protected function &getDB( $db, $groups = array(), $wiki = false ) {
1060                 if ( is_null( $this->mDb ) ) {
1061                         return wfGetDB( $db, $groups, $wiki );
1062                 } else {
1063                         return $this->mDb;
1064                 }
1065         }
1066
1067         /**
1068          * Sets database object to be returned by getDB().
1069          *
1070          * @param $db DatabaseBase: Database object to be used
1071          */
1072         public function setDB( &$db ) {
1073                 $this->mDb = $db;
1074         }
1075
1076         /**
1077          * Lock the search index
1078          * @param &$db Database object
1079          */
1080         private function lockSearchindex( &$db ) {
1081                 $write = array( 'searchindex' );
1082                 $read = array( 'page', 'revision', 'text', 'interwiki', 'l10n_cache' );
1083                 $db->lockTables( $read, $write, __CLASS__ . '::' . __METHOD__ );
1084         }
1085
1086         /**
1087          * Unlock the tables
1088          * @param &$db Database object
1089          */
1090         private function unlockSearchindex( &$db ) {
1091                 $db->unlockTables(  __CLASS__ . '::' . __METHOD__ );
1092         }
1093
1094         /**
1095          * Unlock and lock again
1096          * Since the lock is low-priority, queued reads will be able to complete
1097          * @param &$db Database object
1098          */
1099         private function relockSearchindex( &$db ) {
1100                 $this->unlockSearchindex( $db );
1101                 $this->lockSearchindex( $db );
1102         }
1103
1104         /**
1105          * Perform a search index update with locking
1106          * @param $maxLockTime Integer: the maximum time to keep the search index locked.
1107          * @param $callback callback String: the function that will update the function.
1108          * @param $dbw DatabaseBase object
1109          * @param $results
1110          */
1111         public function updateSearchIndex( $maxLockTime, $callback, $dbw, $results ) {
1112                 $lockTime = time();
1113
1114                 # Lock searchindex
1115                 if ( $maxLockTime ) {
1116                         $this->output( "   --- Waiting for lock ---" );
1117                         $this->lockSearchindex( $dbw );
1118                         $lockTime = time();
1119                         $this->output( "\n" );
1120                 }
1121
1122                 # Loop through the results and do a search update
1123                 foreach ( $results as $row ) {
1124                         # Allow reads to be processed
1125                         if ( $maxLockTime && time() > $lockTime + $maxLockTime ) {
1126                                 $this->output( "    --- Relocking ---" );
1127                                 $this->relockSearchindex( $dbw );
1128                                 $lockTime = time();
1129                                 $this->output( "\n" );
1130                         }
1131                         call_user_func( $callback, $dbw, $row );
1132                 }
1133
1134                 # Unlock searchindex
1135                 if ( $maxLockTime ) {
1136                         $this->output( "    --- Unlocking --" );
1137                         $this->unlockSearchindex( $dbw );
1138                         $this->output( "\n" );
1139                 }
1140
1141         }
1142
1143         /**
1144          * Update the searchindex table for a given pageid
1145          * @param $dbw Database: a database write handle
1146          * @param $pageId Integer: the page ID to update.
1147          * @return null|string
1148          */
1149         public function updateSearchIndexForPage( $dbw, $pageId ) {
1150                 // Get current revision
1151                 $rev = Revision::loadFromPageId( $dbw, $pageId );
1152                 $title = null;
1153                 if ( $rev ) {
1154                         $titleObj = $rev->getTitle();
1155                         $title = $titleObj->getPrefixedDBkey();
1156                         $this->output( "$title..." );
1157                         # Update searchindex
1158                         $u = new SearchUpdate( $pageId, $titleObj->getText(), $rev->getText() );
1159                         $u->doUpdate();
1160                         $this->output( "\n" );
1161                 }
1162                 return $title;
1163         }
1164
1165         /**
1166          * Wrapper for posix_isatty()
1167          * We default as considering stdin a tty (for nice readline methods)
1168          * but treating stout as not a tty to avoid color codes
1169          *
1170          * @param $fd int File descriptor
1171          * @return bool
1172          */
1173         public static function posix_isatty( $fd ) {
1174                 if ( !MWInit::functionExists( 'posix_isatty' ) ) {
1175                         return !$fd;
1176                 } else {
1177                         return posix_isatty( $fd );
1178                 }
1179         }
1180
1181         /**
1182          * Prompt the console for input
1183          * @param $prompt String what to begin the line with, like '> '
1184          * @return String response
1185          */
1186         public static function readconsole( $prompt = '> ' ) {
1187                 static $isatty = null;
1188                 if ( is_null( $isatty ) ) {
1189                         $isatty = self::posix_isatty( 0 /*STDIN*/ );
1190                 }
1191
1192                 if ( $isatty && function_exists( 'readline' ) ) {
1193                         return readline( $prompt );
1194                 } else {
1195                         if ( $isatty ) {
1196                                 $st = self::readlineEmulation( $prompt );
1197                         } else {
1198                                 if ( feof( STDIN ) ) {
1199                                         $st = false;
1200                                 } else {
1201                                         $st = fgets( STDIN, 1024 );
1202                                 }
1203                         }
1204                         if ( $st === false ) return false;
1205                         $resp = trim( $st );
1206                         return $resp;
1207                 }
1208         }
1209
1210         /**
1211          * Emulate readline()
1212          * @param $prompt String what to begin the line with, like '> '
1213          * @return String
1214          */
1215         private static function readlineEmulation( $prompt ) {
1216                 $bash = Installer::locateExecutableInDefaultPaths( array( 'bash' ) );
1217                 if ( !wfIsWindows() && $bash ) {
1218                         $retval = false;
1219                         $encPrompt = wfEscapeShellArg( $prompt );
1220                         $command = "read -er -p $encPrompt && echo \"\$REPLY\"";
1221                         $encCommand = wfEscapeShellArg( $command );
1222                         $line = wfShellExec( "$bash -c $encCommand", $retval );
1223
1224                         if ( $retval == 0 ) {
1225                                 return $line;
1226                         } elseif ( $retval == 127 ) {
1227                                 // Couldn't execute bash even though we thought we saw it.
1228                                 // Shell probably spit out an error message, sorry :(
1229                                 // Fall through to fgets()...
1230                         } else {
1231                                 // EOF/ctrl+D
1232                                 return false;
1233                         }
1234                 }
1235
1236                 // Fallback... we'll have no editing controls, EWWW
1237                 if ( feof( STDIN ) ) {
1238                         return false;
1239                 }
1240                 print $prompt;
1241                 return fgets( STDIN, 1024 );
1242         }
1243 }
1244
1245 /**
1246  * Fake maintenance wrapper, mostly used for the web installer/updater
1247  */
1248 class FakeMaintenance extends Maintenance {
1249         protected $mSelf = "FakeMaintenanceScript";
1250         public function execute() {
1251                 return;
1252         }
1253 }
1254
1255 /**
1256  * Class for scripts that perform database maintenance and want to log the
1257  * update in `updatelog` so we can later skip it
1258  */
1259 abstract class LoggedUpdateMaintenance extends Maintenance {
1260         public function __construct() {
1261                 parent::__construct();
1262                 $this->addOption( 'force', 'Run the update even if it was completed already' );
1263                 $this->setBatchSize( 200 );
1264         }
1265
1266         public function execute() {
1267                 $db = $this->getDB( DB_MASTER );
1268                 $key = $this->getUpdateKey();
1269
1270                 if ( !$this->hasOption( 'force' ) &&
1271                         $db->selectRow( 'updatelog', '1', array( 'ul_key' => $key ), __METHOD__ ) )
1272                 {
1273                         $this->output( "..." . $this->updateSkippedMessage() . "\n" );
1274                         return true;
1275                 }
1276
1277                 if ( !$this->doDBUpdates() ) {
1278                         return false;
1279                 }
1280
1281                 if (
1282                         $db->insert( 'updatelog', array( 'ul_key' => $key ), __METHOD__, 'IGNORE' ) )
1283                 {
1284                         return true;
1285                 } else {
1286                         $this->output( $this->updatelogFailedMessage() . "\n" );
1287                         return false;
1288                 }
1289         }
1290
1291         /**
1292          * Message to show that the update was done already and was just skipped
1293          * @return String
1294          */
1295         protected function updateSkippedMessage() {
1296                 $key = $this->getUpdateKey();
1297                 return "Update '{$key}' already logged as completed.";
1298         }
1299
1300         /**
1301          * Message to show the the update log was unable to log the completion of this update
1302          * @return String
1303          */
1304         protected function updatelogFailedMessage() {
1305                 $key = $this->getUpdateKey();
1306                 return "Unable to log update '{$key}' as completed.";
1307         }
1308
1309         /**
1310          * Do the actual work. All child classes will need to implement this.
1311          * Return true to log the update as done or false (usually on failure).
1312          * @return Bool
1313          */
1314         abstract protected function doDBUpdates();
1315
1316         /**
1317          * Get the update key name to go in the update log table
1318          * @return String
1319          */
1320         abstract protected function getUpdateKey();
1321 }