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 // Make sure we're on PHP5.3.3 or better
  24 if ( !function_exists( 'version_compare' ) || version_compare( PHP_VERSION, '5.3.3' ) < 0 ) {
  25         // We need to use dirname( __FILE__ ) here cause __DIR__ is PHP5.3+
  26         require_once dirname( __FILE__ ) . '/../includes/PHPVersionError.php';
  27         wfPHPVersionError( 'cli' );
  28 }
  29
  30 /**
  31  * @defgroup MaintenanceArchive Maintenance archives
  32  * @ingroup Maintenance
  33  */
  34
  35 // Define this so scripts can easily find doMaintenance.php
  36 define( 'RUN_MAINTENANCE_IF_MAIN', __DIR__ . '/doMaintenance.php' );
  37 define( 'DO_MAINTENANCE', RUN_MAINTENANCE_IF_MAIN ); // original name, harmless
  38
  39 $maintClass = false;
  40
  41 use MediaWiki\Logger\LoggerFactory;
  42
  43 /**
  44  * Abstract maintenance class for quickly writing and churning out
  45  * maintenance scripts with minimal effort. All that _must_ be defined
  46  * is the execute() method. See docs/maintenance.txt for more info
  47  * and a quick demo of how to use it.
  48  *
  49  * @author Chad Horohoe <chad@anyonecanedit.org>
  50  * @since 1.16
  51  * @ingroup Maintenance
  52  */
  53 abstract class Maintenance {
  54         /**
  55          * Constants for DB access type
  56          * @see Maintenance::getDbType()
  57          */
  58         const DB_NONE = 0;
  59         const DB_STD = 1;
  60         const DB_ADMIN = 2;
  61
  62         // Const for getStdin()
  63         const STDIN_ALL = 'all';
  64
  65         // This is the desired params
  66         protected $mParams = array();
  67
  68         // Array of mapping short parameters to long ones
  69         protected $mShortParamsMap = array();
  70
  71         // Array of desired args
  72         protected $mArgList = array();
  73
  74         // This is the list of options that were actually passed
  75         protected $mOptions = array();
  76
  77         // This is the list of arguments that were actually passed
  78         protected $mArgs = array();
  79
  80         // Name of the script currently running
  81         protected $mSelf;
  82
  83         // Special vars for params that are always used
  84         protected $mQuiet = false;
  85         protected $mDbUser, $mDbPass;
  86
  87         // A description of the script, children should change this
  88         protected $mDescription = '';
  89
  90         // Have we already loaded our user input?
  91         protected $mInputLoaded = false;
  92
  93         /**
  94          * Batch size. If a script supports this, they should set
  95          * a default with setBatchSize()
  96          *
  97          * @var int
  98          */
  99         protected $mBatchSize = null;
 100
 101         // Generic options added by addDefaultParams()
 102         private $mGenericParameters = array();
 103         // Generic options which might or not be supported by the script
 104         private $mDependantParameters = array();
 105
 106         /**
 107          * Used by getDB() / setDB()
 108          * @var DatabaseBase
 109          */
 110         private $mDb = null;
 111
 112         /**
 113          * Used when creating separate schema files.
 114          * @var resource
 115          */
 116         public $fileHandle;
 117
 118         /**
 119          * Accessible via getConfig()
 120          *
 121          * @var Config
 122          */
 123         private $config;
 124
 125         /**
 126          * Default constructor. Children should call this *first* if implementing
 127          * their own constructors
 128          */
 129         public function __construct() {
 130                 // Setup $IP, using MW_INSTALL_PATH if it exists
 131                 global $IP;
 132                 $IP = strval( getenv( 'MW_INSTALL_PATH' ) ) !== ''
 133                         ? getenv( 'MW_INSTALL_PATH' )
 134                         : realpath( __DIR__ . '/..' );
 135
 136                 $this->addDefaultParams();
 137                 register_shutdown_function( array( $this, 'outputChanneled' ), false );
 138         }
 139
 140         /**
 141          * Should we execute the maintenance script, or just allow it to be included
 142          * as a standalone class? It checks that the call stack only includes this
 143          * function and "requires" (meaning was called from the file scope)
 144          *
 145          * @return bool
 146          */
 147         public static function shouldExecute() {
 148                 global $wgCommandLineMode;
 149
 150                 if ( !function_exists( 'debug_backtrace' ) ) {
 151                         // If someone has a better idea...
 152                         return $wgCommandLineMode;
 153                 }
 154
 155                 $bt = debug_backtrace();
 156                 $count = count( $bt );
 157                 if ( $count < 2 ) {
 158                         return false; // sanity
 159                 }
 160                 if ( $bt[0]['class'] !== 'Maintenance' || $bt[0]['function'] !== 'shouldExecute' ) {
 161                         return false; // last call should be to this function
 162                 }
 163                 $includeFuncs = array( 'require_once', 'require', 'include', 'include_once' );
 164                 for ( $i = 1; $i < $count; $i++ ) {
 165                         if ( !in_array( $bt[$i]['function'], $includeFuncs ) ) {
 166                                 return false; // previous calls should all be "requires"
 167                         }
 168                 }
 169
 170                 return true;
 171         }
 172
 173         /**
 174          * Do the actual work. All child classes will need to implement this
 175          */
 176         abstract public function execute();
 177
 178         /**
 179          * Add a parameter to the script. Will be displayed on --help
 180          * with the associated description
 181          *
 182          * @param string $name The name of the param (help, version, etc)
 183          * @param string $description The description of the param to show on --help
 184          * @param bool $required Is the param required?
 185          * @param bool $withArg Is an argument required with this option?
 186          * @param string $shortName Character to use as short name
 187          */
 188         protected function addOption( $name, $description, $required = false,
 189                 $withArg = false, $shortName = false
 190         ) {
 191                 $this->mParams[$name] = array(
 192                         'desc' => $description,
 193                         'require' => $required,
 194                         'withArg' => $withArg,
 195                         'shortName' => $shortName
 196                 );
 197
 198                 if ( $shortName !== false ) {
 199                         $this->mShortParamsMap[$shortName] = $name;
 200                 }
 201         }
 202
 203         /**
 204          * Checks to see if a particular param exists.
 205          * @param string $name The name of the param
 206          * @return bool
 207          */
 208         protected function hasOption( $name ) {
 209                 return isset( $this->mOptions[$name] );
 210         }
 211
 212         /**
 213          * Get an option, or return the default
 214          * @param string $name The name of the param
 215          * @param mixed $default Anything you want, default null
 216          * @return mixed
 217          */
 218         protected function getOption( $name, $default = null ) {
 219                 if ( $this->hasOption( $name ) ) {
 220                         return $this->mOptions[$name];
 221                 } else {
 222                         // Set it so we don't have to provide the default again
 223                         $this->mOptions[$name] = $default;
 224
 225                         return $this->mOptions[$name];
 226                 }
 227         }
 228
 229         /**
 230          * Add some args that are needed
 231          * @param string $arg Name of the arg, like 'start'
 232          * @param string $description Short description of the arg
 233          * @param bool $required Is this required?
 234          */
 235         protected function addArg( $arg, $description, $required = true ) {
 236                 $this->mArgList[] = array(
 237                         'name' => $arg,
 238                         'desc' => $description,
 239                         'require' => $required
 240                 );
 241         }
 242
 243         /**
 244          * Remove an option.  Useful for removing options that won't be used in your script.
 245          * @param string $name The option to remove.
 246          */
 247         protected function deleteOption( $name ) {
 248                 unset( $this->mParams[$name] );
 249         }
 250
 251         /**
 252          * Set the description text.
 253          * @param string $text The text of the description
 254          */
 255         protected function addDescription( $text ) {
 256                 $this->mDescription = $text;
 257         }
 258
 259         /**
 260          * Does a given argument exist?
 261          * @param int $argId The integer value (from zero) for the arg
 262          * @return bool
 263          */
 264         protected function hasArg( $argId = 0 ) {
 265                 return isset( $this->mArgs[$argId] );
 266         }
 267
 268         /**
 269          * Get an argument.
 270          * @param int $argId The integer value (from zero) for the arg
 271          * @param mixed $default The default if it doesn't exist
 272          * @return mixed
 273          */
 274         protected function getArg( $argId = 0, $default = null ) {
 275                 return $this->hasArg( $argId ) ? $this->mArgs[$argId] : $default;
 276         }
 277
 278         /**
 279          * Set the batch size.
 280          * @param int $s The number of operations to do in a batch
 281          */
 282         protected function setBatchSize( $s = 0 ) {
 283                 $this->mBatchSize = $s;
 284
 285                 // If we support $mBatchSize, show the option.
 286                 // Used to be in addDefaultParams, but in order for that to
 287                 // work, subclasses would have to call this function in the constructor
 288                 // before they called parent::__construct which is just weird
 289                 // (and really wasn't done).
 290                 if ( $this->mBatchSize ) {
 291                         $this->addOption( 'batch-size', 'Run this many operations ' .
 292                                 'per batch, default: ' . $this->mBatchSize, false, true );
 293                         if ( isset( $this->mParams['batch-size'] ) ) {
 294                                 // This seems a little ugly...
 295                                 $this->mDependantParameters['batch-size'] = $this->mParams['batch-size'];
 296                         }
 297                 }
 298         }
 299
 300         /**
 301          * Get the script's name
 302          * @return string
 303          */
 304         public function getName() {
 305                 return $this->mSelf;
 306         }
 307
 308         /**
 309          * Return input from stdin.
 310          * @param int $len The number of bytes to read. If null, just return the handle.
 311          *   Maintenance::STDIN_ALL returns the full length
 312          * @return mixed
 313          */
 314         protected function getStdin( $len = null ) {
 315                 if ( $len == Maintenance::STDIN_ALL ) {
 316                         return file_get_contents( 'php://stdin' );
 317                 }
 318                 $f = fopen( 'php://stdin', 'rt' );
 319                 if ( !$len ) {
 320                         return $f;
 321                 }
 322                 $input = fgets( $f, $len );
 323                 fclose( $f );
 324
 325                 return rtrim( $input );
 326         }
 327
 328         /**
 329          * @return bool
 330          */
 331         public function isQuiet() {
 332                 return $this->mQuiet;
 333         }
 334
 335         /**
 336          * Throw some output to the user. Scripts can call this with no fears,
 337          * as we handle all --quiet stuff here
 338          * @param string $out The text to show to the user
 339          * @param mixed $channel Unique identifier for the channel. See function outputChanneled.
 340          */
 341         protected function output( $out, $channel = null ) {
 342                 if ( $this->mQuiet ) {
 343                         return;
 344                 }
 345                 if ( $channel === null ) {
 346                         $this->cleanupChanneled();
 347                         print $out;
 348                 } else {
 349                         $out = preg_replace( '/\n\z/', '', $out );
 350                         $this->outputChanneled( $out, $channel );
 351                 }
 352         }
 353
 354         /**
 355          * Throw an error to the user. Doesn't respect --quiet, so don't use
 356          * this for non-error output
 357          * @param string $err The error to display
 358          * @param int $die If > 0, go ahead and die out using this int as the code
 359          */
 360         protected function error( $err, $die = 0 ) {
 361                 $this->outputChanneled( false );
 362                 if ( PHP_SAPI == 'cli' ) {
 363                         fwrite( STDERR, $err . "\n" );
 364                 } else {
 365                         print $err;
 366                 }
 367                 $die = intval( $die );
 368                 if ( $die > 0 ) {
 369                         die( $die );
 370                 }
 371         }
 372
 373         private $atLineStart = true;
 374         private $lastChannel = null;
 375
 376         /**
 377          * Clean up channeled output.  Output a newline if necessary.
 378          */
 379         public function cleanupChanneled() {
 380                 if ( !$this->atLineStart ) {
 381                         print "\n";
 382                         $this->atLineStart = true;
 383                 }
 384         }
 385
 386         /**
 387          * Message outputter with channeled message support. Messages on the
 388          * same channel are concatenated, but any intervening messages in another
 389          * channel start a new line.
 390          * @param string $msg The message without trailing newline
 391          * @param string $channel Channel identifier or null for no
 392          *     channel. Channel comparison uses ===.
 393          */
 394         public function outputChanneled( $msg, $channel = null ) {
 395                 if ( $msg === false ) {
 396                         $this->cleanupChanneled();
 397
 398                         return;
 399                 }
 400
 401                 // End the current line if necessary
 402                 if ( !$this->atLineStart && $channel !== $this->lastChannel ) {
 403                         print "\n";
 404                 }
 405
 406                 print $msg;
 407
 408                 $this->atLineStart = false;
 409                 if ( $channel === null ) {
 410                         // For unchanneled messages, output trailing newline immediately
 411                         print "\n";
 412                         $this->atLineStart = true;
 413                 }
 414                 $this->lastChannel = $channel;
 415         }
 416
 417         /**
 418          * Does the script need different DB access? By default, we give Maintenance
 419          * scripts normal rights to the DB. Sometimes, a script needs admin rights
 420          * access for a reason and sometimes they want no access. Subclasses should
 421          * override and return one of the following values, as needed:
 422          *    Maintenance::DB_NONE  -  For no DB access at all
 423          *    Maintenance::DB_STD   -  For normal DB access, default
 424          *    Maintenance::DB_ADMIN -  For admin DB access
 425          * @return int
 426          */
 427         public function getDbType() {
 428                 return Maintenance::DB_STD;
 429         }
 430
 431         /**
 432          * Add the default parameters to the scripts
 433          */
 434         protected function addDefaultParams() {
 435
 436                 # Generic (non script dependant) options:
 437
 438                 $this->addOption( 'help', 'Display this help message', false, false, 'h' );
 439                 $this->addOption( 'quiet', 'Whether to supress non-error output', false, false, 'q' );
 440                 $this->addOption( 'conf', 'Location of LocalSettings.php, if not default', false, true );
 441                 $this->addOption( 'wiki', 'For specifying the wiki ID', false, true );
 442                 $this->addOption( 'globals', 'Output globals at the end of processing for debugging' );
 443                 $this->addOption(
 444                         'memory-limit',
 445                         'Set a specific memory limit for the script, '
 446                                 . '"max" for no limit or "default" to avoid changing it'
 447                 );
 448                 $this->addOption( 'server', "The protocol and server name to use in URLs, e.g. " .
 449                         "http://en.wikipedia.org. This is sometimes necessary because " .
 450                         "server name detection may fail in command line scripts.", false, true );
 451                 $this->addOption( 'profiler', 'Profiler output format (usually "text")', false, true );
 452
 453                 # Save generic options to display them separately in help
 454                 $this->mGenericParameters = $this->mParams;
 455
 456                 # Script dependant options:
 457
 458                 // If we support a DB, show the options
 459                 if ( $this->getDbType() > 0 ) {
 460                         $this->addOption( 'dbuser', 'The DB user to use for this script', false, true );
 461                         $this->addOption( 'dbpass', 'The password to use for this script', false, true );
 462                 }
 463
 464                 # Save additional script dependant options to display
 465                 # them separately in help
 466                 $this->mDependantParameters = array_diff_key( $this->mParams, $this->mGenericParameters );
 467         }
 468
 469         /**
 470          * @since 1.24
 471          * @return Config
 472          */
 473         public function getConfig() {
 474                 if ( $this->config === null ) {
 475                         $this->config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
 476                 }
 477
 478                 return $this->config;
 479         }
 480
 481         /**
 482          * @since 1.24
 483          * @param Config $config
 484          */
 485         public function setConfig( Config $config ) {
 486                 $this->config = $config;
 487         }
 488
 489         /**
 490          * Run a child maintenance script. Pass all of the current arguments
 491          * to it.
 492          * @param string $maintClass A name of a child maintenance class
 493          * @param string $classFile Full path of where the child is
 494          * @return Maintenance
 495          */
 496         public function runChild( $maintClass, $classFile = null ) {
 497                 // Make sure the class is loaded first
 498                 if ( !class_exists( $maintClass ) ) {
 499                         if ( $classFile ) {
 500                                 require_once $classFile;
 501                         }
 502                         if ( !class_exists( $maintClass ) ) {
 503                                 $this->error( "Cannot spawn child: $maintClass" );
 504                         }
 505                 }
 506
 507                 /**
 508                  * @var $child Maintenance
 509                  */
 510                 $child = new $maintClass();
 511                 $child->loadParamsAndArgs( $this->mSelf, $this->mOptions, $this->mArgs );
 512                 if ( !is_null( $this->mDb ) ) {
 513                         $child->setDB( $this->mDb );
 514                 }
 515
 516                 return $child;
 517         }
 518
 519         /**
 520          * Do some sanity checking and basic setup
 521          */
 522         public function setup() {
 523                 global $IP, $wgCommandLineMode, $wgRequestTime;
 524
 525                 # Abort if called from a web server
 526                 if ( isset( $_SERVER ) && isset( $_SERVER['REQUEST_METHOD'] ) ) {
 527                         $this->error( 'This script must be run from the command line', true );
 528                 }
 529
 530                 if ( $IP === null ) {
 531                         $this->error( "\$IP not set, aborting!\n" .
 532                                 '(Did you forget to call parent::__construct() in your maintenance script?)', 1 );
 533                 }
 534
 535                 # Make sure we can handle script parameters
 536                 if ( !defined( 'HPHP_VERSION' ) && !ini_get( 'register_argc_argv' ) ) {
 537                         $this->error( 'Cannot get command line arguments, register_argc_argv is set to false', true );
 538                 }
 539
 540                 // Send PHP warnings and errors to stderr instead of stdout.
 541                 // This aids in diagnosing problems, while keeping messages
 542                 // out of redirected output.
 543                 if ( ini_get( 'display_errors' ) ) {
 544                         ini_set( 'display_errors', 'stderr' );
 545                 }
 546
 547                 $this->loadParamsAndArgs();
 548                 $this->maybeHelp();
 549
 550                 # Set the memory limit
 551                 # Note we need to set it again later in cache LocalSettings changed it
 552                 $this->adjustMemoryLimit();
 553
 554                 # Set max execution time to 0 (no limit). PHP.net says that
 555                 # "When running PHP from the command line the default setting is 0."
 556                 # But sometimes this doesn't seem to be the case.
 557                 ini_set( 'max_execution_time', 0 );
 558
 559                 $wgRequestTime = microtime( true );
 560
 561                 # Define us as being in MediaWiki
 562                 define( 'MEDIAWIKI', true );
 563
 564                 $wgCommandLineMode = true;
 565
 566                 # Turn off output buffering if it's on
 567                 while ( ob_get_level() > 0 ) {
 568                         ob_end_flush();
 569                 }
 570
 571                 $this->validateParamsAndArgs();
 572         }
 573
 574         /**
 575          * Normally we disable the memory_limit when running admin scripts.
 576          * Some scripts may wish to actually set a limit, however, to avoid
 577          * blowing up unexpectedly. We also support a --memory-limit option,
 578          * to allow sysadmins to explicitly set one if they'd prefer to override
 579          * defaults (or for people using Suhosin which yells at you for trying
 580          * to disable the limits)
 581          * @return string
 582          */
 583         public function memoryLimit() {
 584                 $limit = $this->getOption( 'memory-limit', 'max' );
 585                 $limit = trim( $limit, "\" '" ); // trim quotes in case someone misunderstood
 586                 return $limit;
 587         }
 588
 589         /**
 590          * Adjusts PHP's memory limit to better suit our needs, if needed.
 591          */
 592         protected function adjustMemoryLimit() {
 593                 $limit = $this->memoryLimit();
 594                 if ( $limit == 'max' ) {
 595                         $limit = -1; // no memory limit
 596                 }
 597                 if ( $limit != 'default' ) {
 598                         ini_set( 'memory_limit', $limit );
 599                 }
 600         }
 601
 602         /**
 603          * Activate the profiler (assuming $wgProfiler is set)
 604          */
 605         protected function activateProfiler() {
 606                 global $wgProfiler, $wgTrxProfilerLimits;
 607
 608                 $output = $this->getOption( 'profiler' );
 609                 if ( !$output ) {
 610                         return;
 611                 }
 612
 613                 if ( is_array( $wgProfiler ) && isset( $wgProfiler['class'] ) ) {
 614                         $class = $wgProfiler['class'];
 615                         $profiler = new $class(
 616                                 array( 'sampling' => 1, 'output' => $output ) + $wgProfiler
 617                         );
 618                         $profiler->setTemplated( true );
 619                         Profiler::replaceStubInstance( $profiler );
 620                 }
 621
 622                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 623                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 624                 $trxProfiler->setExpectations( $wgTrxProfilerLimits['Maintenance'], __METHOD__ );
 625         }
 626
 627         /**
 628          * Clear all params and arguments.
 629          */
 630         public function clearParamsAndArgs() {
 631                 $this->mOptions = array();
 632                 $this->mArgs = array();
 633                 $this->mInputLoaded = false;
 634         }
 635
 636         /**
 637          * Process command line arguments
 638          * $mOptions becomes an array with keys set to the option names
 639          * $mArgs becomes a zero-based array containing the non-option arguments
 640          *
 641          * @param string $self The name of the script, if any
 642          * @param array $opts An array of options, in form of key=>value
 643          * @param array $args An array of command line arguments
 644          */
 645         public function loadParamsAndArgs( $self = null, $opts = null, $args = null ) {
 646                 # If we were given opts or args, set those and return early
 647                 if ( $self ) {
 648                         $this->mSelf = $self;
 649                         $this->mInputLoaded = true;
 650                 }
 651                 if ( $opts ) {
 652                         $this->mOptions = $opts;
 653                         $this->mInputLoaded = true;
 654                 }
 655                 if ( $args ) {
 656                         $this->mArgs = $args;
 657                         $this->mInputLoaded = true;
 658                 }
 659
 660                 # If we've already loaded input (either by user values or from $argv)
 661                 # skip on loading it again. The array_shift() will corrupt values if
 662                 # it's run again and again
 663                 if ( $this->mInputLoaded ) {
 664                         $this->loadSpecialVars();
 665
 666                         return;
 667                 }
 668
 669                 global $argv;
 670                 $this->mSelf = array_shift( $argv );
 671
 672                 $options = array();
 673                 $args = array();
 674
 675                 # Parse arguments
 676                 for ( $arg = reset( $argv ); $arg !== false; $arg = next( $argv ) ) {
 677                         if ( $arg == '--' ) {
 678                                 # End of options, remainder should be considered arguments
 679                                 $arg = next( $argv );
 680                                 while ( $arg !== false ) {
 681                                         $args[] = $arg;
 682                                         $arg = next( $argv );
 683                                 }
 684                                 break;
 685                         } elseif ( substr( $arg, 0, 2 ) == '--' ) {
 686                                 # Long options
 687                                 $option = substr( $arg, 2 );
 688                                 if ( array_key_exists( $option, $options ) ) {
 689                                         $this->error( "\nERROR: $option parameter given twice\n" );
 690                                         $this->maybeHelp( true );
 691                                 }
 692                                 if ( isset( $this->mParams[$option] ) && $this->mParams[$option]['withArg'] ) {
 693                                         $param = next( $argv );
 694                                         if ( $param === false ) {
 695                                                 $this->error( "\nERROR: $option parameter needs a value after it\n" );
 696                                                 $this->maybeHelp( true );
 697                                         }
 698                                         $options[$option] = $param;
 699                                 } else {
 700                                         $bits = explode( '=', $option, 2 );
 701                                         if ( count( $bits ) > 1 ) {
 702                                                 $option = $bits[0];
 703                                                 $param = $bits[1];
 704                                         } else {
 705                                                 $param = 1;
 706                                         }
 707                                         $options[$option] = $param;
 708                                 }
 709                         } elseif ( $arg == '-' ) {
 710                                 # Lonely "-", often used to indicate stdin or stdout.
 711                                 $args[] = $arg;
 712                         } elseif ( substr( $arg, 0, 1 ) == '-' ) {
 713                                 # Short options
 714                                 $argLength = strlen( $arg );
 715                                 for ( $p = 1; $p < $argLength; $p++ ) {
 716                                         $option = $arg[$p];
 717                                         if ( !isset( $this->mParams[$option] ) && isset( $this->mShortParamsMap[$option] ) ) {
 718                                                 $option = $this->mShortParamsMap[$option];
 719                                         }
 720                                         if ( array_key_exists( $option, $options ) ) {
 721                                                 $this->error( "\nERROR: $option parameter given twice\n" );
 722                                                 $this->maybeHelp( true );
 723                                         }
 724                                         if ( isset( $this->mParams[$option]['withArg'] ) && $this->mParams[$option]['withArg'] ) {
 725                                                 $param = next( $argv );
 726                                                 if ( $param === false ) {
 727                                                         $this->error( "\nERROR: $option parameter needs a value after it\n" );
 728                                                         $this->maybeHelp( true );
 729                                                 }
 730                                                 $options[$option] = $param;
 731                                         } else {
 732                                                 $options[$option] = 1;
 733                                         }
 734                                 }
 735                         } else {
 736                                 $args[] = $arg;
 737                         }
 738                 }
 739
 740                 $this->mOptions = $options;
 741                 $this->mArgs = $args;
 742                 $this->loadSpecialVars();
 743                 $this->mInputLoaded = true;
 744         }
 745
 746         /**
 747          * Run some validation checks on the params, etc
 748          */
 749         protected function validateParamsAndArgs() {
 750                 $die = false;
 751                 # Check to make sure we've got all the required options
 752                 foreach ( $this->mParams as $opt => $info ) {
 753                         if ( $info['require'] && !$this->hasOption( $opt ) ) {
 754                                 $this->error( "Param $opt required!" );
 755                                 $die = true;
 756                         }
 757                 }
 758                 # Check arg list too
 759                 foreach ( $this->mArgList as $k => $info ) {
 760                         if ( $info['require'] && !$this->hasArg( $k ) ) {
 761                                 $this->error( 'Argument <' . $info['name'] . '> required!' );
 762                                 $die = true;
 763                         }
 764                 }
 765
 766                 if ( $die ) {
 767                         $this->maybeHelp( true );
 768                 }
 769         }
 770
 771         /**
 772          * Handle the special variables that are global to all scripts
 773          */
 774         protected function loadSpecialVars() {
 775                 if ( $this->hasOption( 'dbuser' ) ) {
 776                         $this->mDbUser = $this->getOption( 'dbuser' );
 777                 }
 778                 if ( $this->hasOption( 'dbpass' ) ) {
 779                         $this->mDbPass = $this->getOption( 'dbpass' );
 780                 }
 781                 if ( $this->hasOption( 'quiet' ) ) {
 782                         $this->mQuiet = true;
 783                 }
 784                 if ( $this->hasOption( 'batch-size' ) ) {
 785                         $this->mBatchSize = intval( $this->getOption( 'batch-size' ) );
 786                 }
 787         }
 788
 789         /**
 790          * Maybe show the help.
 791          * @param bool $force Whether to force the help to show, default false
 792          */
 793         protected function maybeHelp( $force = false ) {
 794                 if ( !$force && !$this->hasOption( 'help' ) ) {
 795                         return;
 796                 }
 797
 798                 $screenWidth = 80; // TODO: Calculate this!
 799                 $tab = "    ";
 800                 $descWidth = $screenWidth - ( 2 * strlen( $tab ) );
 801
 802                 ksort( $this->mParams );
 803                 $this->mQuiet = false;
 804
 805                 // Description ...
 806                 if ( $this->mDescription ) {
 807                         $this->output( "\n" . $this->mDescription . "\n" );
 808                 }
 809                 $output = "\nUsage: php " . basename( $this->mSelf );
 810
 811                 // ... append parameters ...
 812                 if ( $this->mParams ) {
 813                         $output .= " [--" . implode( array_keys( $this->mParams ), "|--" ) . "]";
 814                 }
 815
 816                 // ... and append arguments.
 817                 if ( $this->mArgList ) {
 818                         $output .= ' ';
 819                         foreach ( $this->mArgList as $k => $arg ) {
 820                                 if ( $arg['require'] ) {
 821                                         $output .= '<' . $arg['name'] . '>';
 822                                 } else {
 823                                         $output .= '[' . $arg['name'] . ']';
 824                                 }
 825                                 if ( $k < count( $this->mArgList ) - 1 ) {
 826                                         $output .= ' ';
 827                                 }
 828                         }
 829                 }
 830                 $this->output( "$output\n\n" );
 831
 832                 # TODO abstract some repetitive code below
 833
 834                 // Generic parameters
 835                 $this->output( "Generic maintenance parameters:\n" );
 836                 foreach ( $this->mGenericParameters as $par => $info ) {
 837                         if ( $info['shortName'] !== false ) {
 838                                 $par .= " (-{$info['shortName']})";
 839                         }
 840                         $this->output(
 841                                 wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 842                                         "\n$tab$tab" ) . "\n"
 843                         );
 844                 }
 845                 $this->output( "\n" );
 846
 847                 $scriptDependantParams = $this->mDependantParameters;
 848                 if ( count( $scriptDependantParams ) > 0 ) {
 849                         $this->output( "Script dependant parameters:\n" );
 850                         // Parameters description
 851                         foreach ( $scriptDependantParams as $par => $info ) {
 852                                 if ( $info['shortName'] !== false ) {
 853                                         $par .= " (-{$info['shortName']})";
 854                                 }
 855                                 $this->output(
 856                                         wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 857                                                 "\n$tab$tab" ) . "\n"
 858                                 );
 859                         }
 860                         $this->output( "\n" );
 861                 }
 862
 863                 // Script specific parameters not defined on construction by
 864                 // Maintenance::addDefaultParams()
 865                 $scriptSpecificParams = array_diff_key(
 866                         # all script parameters:
 867                         $this->mParams,
 868                         # remove the Maintenance default parameters:
 869                         $this->mGenericParameters,
 870                         $this->mDependantParameters
 871                 );
 872                 if ( count( $scriptSpecificParams ) > 0 ) {
 873                         $this->output( "Script specific parameters:\n" );
 874                         // Parameters description
 875                         foreach ( $scriptSpecificParams as $par => $info ) {
 876                                 if ( $info['shortName'] !== false ) {
 877                                         $par .= " (-{$info['shortName']})";
 878                                 }
 879                                 $this->output(
 880                                         wordwrap( "$tab--$par: " . $info['desc'], $descWidth,
 881                                                 "\n$tab$tab" ) . "\n"
 882                                 );
 883                         }
 884                         $this->output( "\n" );
 885                 }
 886
 887                 // Print arguments
 888                 if ( count( $this->mArgList ) > 0 ) {
 889                         $this->output( "Arguments:\n" );
 890                         // Arguments description
 891                         foreach ( $this->mArgList as $info ) {
 892                                 $openChar = $info['require'] ? '<' : '[';
 893                                 $closeChar = $info['require'] ? '>' : ']';
 894                                 $this->output(
 895                                         wordwrap( "$tab$openChar" . $info['name'] . "$closeChar: " .
 896                                                 $info['desc'], $descWidth, "\n$tab$tab" ) . "\n"
 897                                 );
 898                         }
 899                         $this->output( "\n" );
 900                 }
 901
 902                 die( 1 );
 903         }
 904
 905         /**
 906          * Handle some last-minute setup here.
 907          */
 908         public function finalSetup() {
 909                 global $wgCommandLineMode, $wgShowSQLErrors, $wgServer;
 910                 global $wgDBadminuser, $wgDBadminpassword;
 911                 global $wgDBuser, $wgDBpassword, $wgDBservers, $wgLBFactoryConf;
 912
 913                 # Turn off output buffering again, it might have been turned on in the settings files
 914                 if ( ob_get_level() ) {
 915                         ob_end_flush();
 916                 }
 917                 # Same with these
 918                 $wgCommandLineMode = true;
 919
 920                 # Override $wgServer
 921                 if ( $this->hasOption( 'server' ) ) {
 922                         $wgServer = $this->getOption( 'server', $wgServer );
 923                 }
 924
 925                 # If these were passed, use them
 926                 if ( $this->mDbUser ) {
 927                         $wgDBadminuser = $this->mDbUser;
 928                 }
 929                 if ( $this->mDbPass ) {
 930                         $wgDBadminpassword = $this->mDbPass;
 931                 }
 932
 933                 if ( $this->getDbType() == self::DB_ADMIN && isset( $wgDBadminuser ) ) {
 934                         $wgDBuser = $wgDBadminuser;
 935                         $wgDBpassword = $wgDBadminpassword;
 936
 937                         if ( $wgDBservers ) {
 938                                 /**
 939                                  * @var $wgDBservers array
 940                                  */
 941                                 foreach ( $wgDBservers as $i => $server ) {
 942                                         $wgDBservers[$i]['user'] = $wgDBuser;
 943                                         $wgDBservers[$i]['password'] = $wgDBpassword;
 944                                 }
 945                         }
 946                         if ( isset( $wgLBFactoryConf['serverTemplate'] ) ) {
 947                                 $wgLBFactoryConf['serverTemplate']['user'] = $wgDBuser;
 948                                 $wgLBFactoryConf['serverTemplate']['password'] = $wgDBpassword;
 949                         }
 950                         LBFactory::destroyInstance();
 951                 }
 952
 953                 // Per-script profiling; useful for debugging
 954                 $this->activateProfiler();
 955
 956                 $this->afterFinalSetup();
 957
 958                 $wgShowSQLErrors = true;
 959
 960                 // @codingStandardsIgnoreStart Allow error suppression. wfSuppressWarnings()
 961                 // is not available.
 962                 @set_time_limit( 0 );
 963                 // @codingStandardsIgnoreStart
 964
 965                 $this->adjustMemoryLimit();
 966         }
 967
 968         /**
 969          * Execute a callback function at the end of initialisation
 970          */
 971         protected function afterFinalSetup() {
 972                 if ( defined( 'MW_CMDLINE_CALLBACK' ) ) {
 973                         call_user_func( MW_CMDLINE_CALLBACK );
 974                 }
 975         }
 976
 977         /**
 978          * Potentially debug globals. Originally a feature only
 979          * for refreshLinks
 980          */
 981         public function globals() {
 982                 if ( $this->hasOption( 'globals' ) ) {
 983                         print_r( $GLOBALS );
 984                 }
 985         }
 986
 987         /**
 988          * Generic setup for most installs. Returns the location of LocalSettings
 989          * @return string
 990          */
 991         public function loadSettings() {
 992                 global $wgCommandLineMode, $IP;
 993
 994                 if ( isset( $this->mOptions['conf'] ) ) {
 995                         $settingsFile = $this->mOptions['conf'];
 996                 } elseif ( defined( "MW_CONFIG_FILE" ) ) {
 997                         $settingsFile = MW_CONFIG_FILE;
 998                 } else {
 999                         $settingsFile = "$IP/LocalSettings.php";
1000                 }
1001                 if ( isset( $this->mOptions['wiki'] ) ) {
1002                         $bits = explode( '-', $this->mOptions['wiki'] );
1003                         if ( count( $bits ) == 1 ) {
1004                                 $bits[] = '';
1005                         }
1006                         define( 'MW_DB', $bits[0] );
1007                         define( 'MW_PREFIX', $bits[1] );
1008                 }
1009
1010                 if ( !is_readable( $settingsFile ) ) {
1011                         $this->error( "A copy of your installation's LocalSettings.php\n" .
1012                                 "must exist and be readable in the source directory.\n" .
1013                                 "Use --conf to specify it.", true );
1014                 }
1015                 $wgCommandLineMode = true;
1016
1017                 return $settingsFile;
1018         }
1019
1020         /**
1021          * Support function for cleaning up redundant text records
1022          * @param bool $delete Whether or not to actually delete the records
1023          * @author Rob Church <robchur@gmail.com>
1024          */
1025         public function purgeRedundantText( $delete = true ) {
1026                 # Data should come off the master, wrapped in a transaction
1027                 $dbw = $this->getDB( DB_MASTER );
1028                 $dbw->begin( __METHOD__ );
1029
1030                 # Get "active" text records from the revisions table
1031                 $this->output( 'Searching for active text records in revisions table...' );
1032                 $res = $dbw->select( 'revision', 'rev_text_id', array(), __METHOD__, array( 'DISTINCT' ) );
1033                 foreach ( $res as $row ) {
1034                         $cur[] = $row->rev_text_id;
1035                 }
1036                 $this->output( "done.\n" );
1037
1038                 # Get "active" text records from the archive table
1039                 $this->output( 'Searching for active text records in archive table...' );
1040                 $res = $dbw->select( 'archive', 'ar_text_id', array(), __METHOD__, array( 'DISTINCT' ) );
1041                 foreach ( $res as $row ) {
1042                         # old pre-MW 1.5 records can have null ar_text_id's.
1043                         if ( $row->ar_text_id !== null ) {
1044                                 $cur[] = $row->ar_text_id;
1045                         }
1046                 }
1047                 $this->output( "done.\n" );
1048
1049                 # Get the IDs of all text records not in these sets
1050                 $this->output( 'Searching for inactive text records...' );
1051                 $cond = 'old_id NOT IN ( ' . $dbw->makeList( $cur ) . ' )';
1052                 $res = $dbw->select( 'text', 'old_id', array( $cond ), __METHOD__, array( 'DISTINCT' ) );
1053                 $old = array();
1054                 foreach ( $res as $row ) {
1055                         $old[] = $row->old_id;
1056                 }
1057                 $this->output( "done.\n" );
1058
1059                 # Inform the user of what we're going to do
1060                 $count = count( $old );
1061                 $this->output( "$count inactive items found.\n" );
1062
1063                 # Delete as appropriate
1064                 if ( $delete && $count ) {
1065                         $this->output( 'Deleting...' );
1066                         $dbw->delete( 'text', array( 'old_id' => $old ), __METHOD__ );
1067                         $this->output( "done.\n" );
1068                 }
1069
1070                 # Done
1071                 $dbw->commit( __METHOD__ );
1072         }
1073
1074         /**
1075          * Get the maintenance directory.
1076          * @return string
1077          */
1078         protected function getDir() {
1079                 return __DIR__;
1080         }
1081
1082         /**
1083          * Returns a database to be used by current maintenance script. It can be set by setDB().
1084          * If not set, wfGetDB() will be used.
1085          * This function has the same parameters as wfGetDB()
1086          *
1087          * @return DatabaseBase
1088          */
1089         protected function getDB( $db, $groups = array(), $wiki = false ) {
1090                 if ( is_null( $this->mDb ) ) {
1091                         return wfGetDB( $db, $groups, $wiki );
1092                 } else {
1093                         return $this->mDb;
1094                 }
1095         }
1096
1097         /**
1098          * Sets database object to be returned by getDB().
1099          *
1100          * @param DatabaseBase $db Database object to be used
1101          */
1102         public function setDB( $db ) {
1103                 $this->mDb = $db;
1104         }
1105
1106         /**
1107          * Lock the search index
1108          * @param DatabaseBase &$db
1109          */
1110         private function lockSearchindex( $db ) {
1111                 $write = array( 'searchindex' );
1112                 $read = array( 'page', 'revision', 'text', 'interwiki', 'l10n_cache', 'user', 'page_restrictions' );
1113                 $db->lockTables( $read, $write, __CLASS__ . '::' . __METHOD__ );
1114         }
1115
1116         /**
1117          * Unlock the tables
1118          * @param DatabaseBase &$db
1119          */
1120         private function unlockSearchindex( $db ) {
1121                 $db->unlockTables( __CLASS__ . '::' . __METHOD__ );
1122         }
1123
1124         /**
1125          * Unlock and lock again
1126          * Since the lock is low-priority, queued reads will be able to complete
1127          * @param DatabaseBase &$db
1128          */
1129         private function relockSearchindex( $db ) {
1130                 $this->unlockSearchindex( $db );
1131                 $this->lockSearchindex( $db );
1132         }
1133
1134         /**
1135          * Perform a search index update with locking
1136          * @param int $maxLockTime The maximum time to keep the search index locked.
1137          * @param string $callback The function that will update the function.
1138          * @param DatabaseBase $dbw
1139          * @param array $results
1140          */
1141         public function updateSearchIndex( $maxLockTime, $callback, $dbw, $results ) {
1142                 $lockTime = time();
1143
1144                 # Lock searchindex
1145                 if ( $maxLockTime ) {
1146                         $this->output( "   --- Waiting for lock ---" );
1147                         $this->lockSearchindex( $dbw );
1148                         $lockTime = time();
1149                         $this->output( "\n" );
1150                 }
1151
1152                 # Loop through the results and do a search update
1153                 foreach ( $results as $row ) {
1154                         # Allow reads to be processed
1155                         if ( $maxLockTime && time() > $lockTime + $maxLockTime ) {
1156                                 $this->output( "    --- Relocking ---" );
1157                                 $this->relockSearchindex( $dbw );
1158                                 $lockTime = time();
1159                                 $this->output( "\n" );
1160                         }
1161                         call_user_func( $callback, $dbw, $row );
1162                 }
1163
1164                 # Unlock searchindex
1165                 if ( $maxLockTime ) {
1166                         $this->output( "    --- Unlocking --" );
1167                         $this->unlockSearchindex( $dbw );
1168                         $this->output( "\n" );
1169                 }
1170         }
1171
1172         /**
1173          * Update the searchindex table for a given pageid
1174          * @param DatabaseBase $dbw A database write handle
1175          * @param int $pageId The page ID to update.
1176          * @return null|string
1177          */
1178         public function updateSearchIndexForPage( $dbw, $pageId ) {
1179                 // Get current revision
1180                 $rev = Revision::loadFromPageId( $dbw, $pageId );
1181                 $title = null;
1182                 if ( $rev ) {
1183                         $titleObj = $rev->getTitle();
1184                         $title = $titleObj->getPrefixedDBkey();
1185                         $this->output( "$title..." );
1186                         # Update searchindex
1187                         $u = new SearchUpdate( $pageId, $titleObj->getText(), $rev->getContent() );
1188                         $u->doUpdate();
1189                         $this->output( "\n" );
1190                 }
1191
1192                 return $title;
1193         }
1194
1195         /**
1196          * Wrapper for posix_isatty()
1197          * We default as considering stdin a tty (for nice readline methods)
1198          * but treating stout as not a tty to avoid color codes
1199          *
1200          * @param mixed $fd File descriptor
1201          * @return bool
1202          */
1203         public static function posix_isatty( $fd ) {
1204                 if ( !function_exists( 'posix_isatty' ) ) {
1205                         return !$fd;
1206                 } else {
1207                         return posix_isatty( $fd );
1208                 }
1209         }
1210
1211         /**
1212          * Prompt the console for input
1213          * @param string $prompt What to begin the line with, like '> '
1214          * @return string Response
1215          */
1216         public static function readconsole( $prompt = '> ' ) {
1217                 static $isatty = null;
1218                 if ( is_null( $isatty ) ) {
1219                         $isatty = self::posix_isatty( 0 /*STDIN*/ );
1220                 }
1221
1222                 if ( $isatty && function_exists( 'readline' ) ) {
1223                         $resp = readline( $prompt );
1224                         if ( $resp === null ) {
1225                                 // Workaround for https://github.com/facebook/hhvm/issues/4776
1226                                 return false;
1227                         } else {
1228                                 return $resp;
1229                         }
1230                 } else {
1231                         if ( $isatty ) {
1232                                 $st = self::readlineEmulation( $prompt );
1233                         } else {
1234                                 if ( feof( STDIN ) ) {
1235                                         $st = false;
1236                                 } else {
1237                                         $st = fgets( STDIN, 1024 );
1238                                 }
1239                         }
1240                         if ( $st === false ) {
1241                                 return false;
1242                         }
1243                         $resp = trim( $st );
1244
1245                         return $resp;
1246                 }
1247         }
1248
1249         /**
1250          * Emulate readline()
1251          * @param string $prompt What to begin the line with, like '> '
1252          * @return string
1253          */
1254         private static function readlineEmulation( $prompt ) {
1255                 $bash = Installer::locateExecutableInDefaultPaths( array( 'bash' ) );
1256                 if ( !wfIsWindows() && $bash ) {
1257                         $retval = false;
1258                         $encPrompt = wfEscapeShellArg( $prompt );
1259                         $command = "read -er -p $encPrompt && echo \"\$REPLY\"";
1260                         $encCommand = wfEscapeShellArg( $command );
1261                         $line = wfShellExec( "$bash -c $encCommand", $retval, array(), array( 'walltime' => 0 ) );
1262
1263                         if ( $retval == 0 ) {
1264                                 return $line;
1265                         } elseif ( $retval == 127 ) {
1266                                 // Couldn't execute bash even though we thought we saw it.
1267                                 // Shell probably spit out an error message, sorry :(
1268                                 // Fall through to fgets()...
1269                         } else {
1270                                 // EOF/ctrl+D
1271                                 return false;
1272                         }
1273                 }
1274
1275                 // Fallback... we'll have no editing controls, EWWW
1276                 if ( feof( STDIN ) ) {
1277                         return false;
1278                 }
1279                 print $prompt;
1280
1281                 return fgets( STDIN, 1024 );
1282         }
1283 }
1284
1285 /**
1286  * Fake maintenance wrapper, mostly used for the web installer/updater
1287  */
1288 class FakeMaintenance extends Maintenance {
1289         protected $mSelf = "FakeMaintenanceScript";
1290
1291         public function execute() {
1292                 return;
1293         }
1294 }
1295
1296 /**
1297  * Class for scripts that perform database maintenance and want to log the
1298  * update in `updatelog` so we can later skip it
1299  */
1300 abstract class LoggedUpdateMaintenance extends Maintenance {
1301         public function __construct() {
1302                 parent::__construct();
1303                 $this->addOption( 'force', 'Run the update even if it was completed already' );
1304                 $this->setBatchSize( 200 );
1305         }
1306
1307         public function execute() {
1308                 $db = $this->getDB( DB_MASTER );
1309                 $key = $this->getUpdateKey();
1310
1311                 if ( !$this->hasOption( 'force' )
1312                         && $db->selectRow( 'updatelog', '1', array( 'ul_key' => $key ), __METHOD__ )
1313                 ) {
1314                         $this->output( "..." . $this->updateSkippedMessage() . "\n" );
1315
1316                         return true;
1317                 }
1318
1319                 if ( !$this->doDBUpdates() ) {
1320                         return false;
1321                 }
1322
1323                 if ( $db->insert( 'updatelog', array( 'ul_key' => $key ), __METHOD__, 'IGNORE' ) ) {
1324                         return true;
1325                 } else {
1326                         $this->output( $this->updatelogFailedMessage() . "\n" );
1327
1328                         return false;
1329                 }
1330         }
1331
1332         /**
1333          * Message to show that the update was done already and was just skipped
1334          * @return string
1335          */
1336         protected function updateSkippedMessage() {
1337                 $key = $this->getUpdateKey();
1338
1339                 return "Update '{$key}' already logged as completed.";
1340         }
1341
1342         /**
1343          * Message to show that the update log was unable to log the completion of this update
1344          * @return string
1345          */
1346         protected function updatelogFailedMessage() {
1347                 $key = $this->getUpdateKey();
1348
1349                 return "Unable to log update '{$key}' as completed.";
1350         }
1351
1352         /**
1353          * Do the actual work. All child classes will need to implement this.
1354          * Return true to log the update as done or false (usually on failure).
1355          * @return bool
1356          */
1357         abstract protected function doDBUpdates();
1358
1359         /**
1360          * Get the update key name to go in the update log table
1361          * @return string
1362          */
1363         abstract protected function getUpdateKey();
1364 }