includes/specials/SpecialVersion.php

   1 <?php
   2 /**
   3  * Implements Special:Version
   4  *
   5  * Copyright © 2005 Ævar Arnfjörð Bjarmason
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @ingroup SpecialPage
  24  */
  25
  26 /**
  27  * Give information about the version of MediaWiki, PHP, the DB and extensions
  28  *
  29  * @ingroup SpecialPage
  30  */
  31 class SpecialVersion extends SpecialPage {
  32
  33         protected $firstExtOpened = false;
  34
  35         protected static $extensionTypes = false;
  36
  37         protected static $viewvcUrls = array(
  38                 'svn+ssh://svn.wikimedia.org/svnroot/mediawiki' => 'http://svn.wikimedia.org/viewvc/mediawiki',
  39                 'http://svn.wikimedia.org/svnroot/mediawiki' => 'http://svn.wikimedia.org/viewvc/mediawiki',
  40                 # Doesn't work at the time of writing but maybe some day:
  41                 'https://svn.wikimedia.org/viewvc/mediawiki' => 'http://svn.wikimedia.org/viewvc/mediawiki',
  42         );
  43
  44         public function __construct(){
  45                 parent::__construct( 'Version' );
  46         }
  47
  48         /**
  49          * main()
  50          */
  51         public function execute( $par ) {
  52                 global $wgOut, $wgSpecialVersionShowHooks, $wgContLang;
  53
  54                 $this->setHeaders();
  55                 $this->outputHeader();
  56
  57                 $wgOut->addHTML( Xml::openElement( 'div',
  58                         array( 'dir' => $wgContLang->getDir() ) ) );
  59                 $text =
  60                         $this->getMediaWikiCredits() .
  61                         $this->softwareInformation() .
  62                         $this->getExtensionCredits();
  63                 if ( $wgSpecialVersionShowHooks ) {
  64                         $text .= $this->getWgHooks();
  65                 }
  66
  67                 $wgOut->addWikiText( $text );
  68                 $wgOut->addHTML( $this->IPInfo() );
  69                 $wgOut->addHTML( '</div>' );
  70         }
  71
  72         /**
  73          * Returns wiki text showing the license information.
  74          *
  75          * @return string
  76          */
  77         private static function getMediaWikiCredits() {
  78                 $ret = Xml::element( 'h2', array( 'id' => 'mw-version-license' ), wfMsg( 'version-license' ) );
  79
  80                 // This text is always left-to-right.
  81                 $ret .= '<div>';
  82                 $ret .= "__NOTOC__
  83                 " . self::getCopyrightAndAuthorList() . "\n
  84                 " . wfMsg( 'version-license-info' );
  85                 $ret .= '</div>';
  86
  87                 return str_replace( "\t\t", '', $ret ) . "\n";
  88         }
  89
  90         /**
  91          * Get the "Mediawiki is copyright 2001-20xx by lots of cool guys" text
  92          *
  93          * @return String
  94          */
  95         public static function getCopyrightAndAuthorList() {
  96                 global $wgLang;
  97
  98                 $authorList = array( 'Magnus Manske', 'Brion Vibber', 'Lee Daniel Crocker',
  99                         'Tim Starling', 'Erik Möller', 'Gabriel Wicke', 'Ævar Arnfjörð Bjarmason',
 100                         'Niklas Laxström', 'Domas Mituzas', 'Rob Church', 'Yuri Astrakhan',
 101                         'Aryeh Gregor', 'Aaron Schulz', 'Andrew Garrett', 'Raimond Spekking',
 102                         'Alexandre Emsenhuber', 'Siebrand Mazeland', 'Chad Horohoe',
 103                         wfMsg( 'version-poweredby-others' )
 104                 );
 105
 106                 return wfMsg( 'version-poweredby-credits', date( 'Y' ),
 107                         $wgLang->listToText( $authorList ) );
 108         }
 109
 110         /**
 111          * Returns wiki text showing the third party software versions (apache, php, mysql).
 112          *
 113          * @return string
 114          */
 115         static function softwareInformation() {
 116                 $dbr = wfGetDB( DB_SLAVE );
 117
 118                 // Put the software in an array of form 'name' => 'version'. All messages should
 119                 // be loaded here, so feel free to use wfMsg*() in the 'name'. Raw HTML or wikimarkup
 120                 // can be used.
 121                 $software = array();
 122                 $software['[http://www.mediawiki.org/ MediaWiki]'] = self::getVersionLinked();
 123                 $software['[http://www.php.net/ PHP]'] = phpversion() . " (" . php_sapi_name() . ")";
 124                 $software[$dbr->getSoftwareLink()] = $dbr->getServerInfo();
 125
 126                 // Allow a hook to add/remove items.
 127                 wfRunHooks( 'SoftwareInfo', array( &$software ) );
 128
 129                 $out = Xml::element( 'h2', array( 'id' => 'mw-version-software' ), wfMsg( 'version-software' ) ) .
 130                            Xml::openElement( 'table', array( 'class' => 'wikitable', 'id' => 'sv-software' ) ) .
 131                                 "<tr>
 132                                         <th>" . wfMsg( 'version-software-product' ) . "</th>
 133                                         <th>" . wfMsg( 'version-software-version' ) . "</th>
 134                                 </tr>\n";
 135
 136                 foreach( $software as $name => $version ) {
 137                         $out .= "<tr>
 138                                         <td>" . $name . "</td>
 139                                         <td>" . $version . "</td>
 140                                 </tr>\n";
 141                 }
 142
 143                 return $out . Xml::closeElement( 'table' );
 144         }
 145
 146         /**
 147          * Return a string of the MediaWiki version with SVN revision if available.
 148          *
 149          * @return mixed
 150          */
 151         public static function getVersion( $flags = '' ) {
 152                 global $wgVersion, $IP;
 153                 wfProfileIn( __METHOD__ );
 154
 155                 $info = self::getSvnInfo( $IP );
 156                 if ( !$info ) {
 157                         $version = $wgVersion;
 158                 } elseif( $flags === 'nodb' ) {
 159                         $version = "$wgVersion (r{$info['checkout-rev']})";
 160                 } else {
 161                         $version = $wgVersion . ' ' .
 162                                 wfMsg(
 163                                         'version-svn-revision',
 164                                         isset( $info['directory-rev'] ) ? $info['directory-rev'] : '',
 165                                         $info['checkout-rev']
 166                                 );
 167                 }
 168
 169                 wfProfileOut( __METHOD__ );
 170                 return $version;
 171         }
 172
 173         /**
 174          * Return a wikitext-formatted string of the MediaWiki version with a link to
 175          * the SVN revision if available.
 176          *
 177          * @return mixed
 178          */
 179         public static function getVersionLinked() {
 180                 global $wgVersion, $IP;
 181                 wfProfileIn( __METHOD__ );
 182
 183                 $info = self::getSvnInfo( $IP );
 184
 185                 if ( isset(  $info['checkout-rev'] ) ) {
 186                         $linkText = wfMsg(
 187                                 'version-svn-revision',
 188                                 isset( $info['directory-rev'] ) ? $info['directory-rev'] : '',
 189                                 $info['checkout-rev']
 190                         );
 191
 192                         if ( isset( $info['viewvc-url'] ) ) {
 193                                 $version = "$wgVersion [{$info['viewvc-url']} $linkText]";
 194                         } else {
 195                                 $version = "$wgVersion $linkText";
 196                         }
 197                 } else {
 198                         $version = $wgVersion;
 199                 }
 200
 201                 wfProfileOut( __METHOD__ );
 202                 return $version;
 203         }
 204
 205         /**
 206          * Returns an array with the base extension types.
 207          * Type is stored as array key, the message as array value.
 208          *
 209          * TODO: ideally this would return all extension types, including
 210          * those added by SpecialVersionExtensionTypes. This is not possible
 211          * since this hook is passing along $this though.
 212          *
 213          * @since 1.17
 214          *
 215          * @return array
 216          */
 217         public static function getExtensionTypes() {
 218                 if ( self::$extensionTypes === false ) {
 219                         self::$extensionTypes = array(
 220                                 'specialpage' => wfMsg( 'version-specialpages' ),
 221                                 'parserhook' => wfMsg( 'version-parserhooks' ),
 222                                 'variable' => wfMsg( 'version-variables' ),
 223                                 'media' => wfMsg( 'version-mediahandlers' ),
 224                                 'other' => wfMsg( 'version-other' ),
 225                         );
 226
 227                         wfRunHooks( 'ExtensionTypes', array( &self::$extensionTypes ) );
 228                 }
 229
 230                 return self::$extensionTypes;
 231         }
 232
 233         /**
 234          * Returns the internationalized name for an extension type.
 235          *
 236          * @since 1.17
 237          *
 238          * @param $type String
 239          *
 240          * @return string
 241          */
 242         public static function getExtensionTypeName( $type ) {
 243                 $types = self::getExtensionTypes();
 244                 return $types[$type];
 245         }
 246
 247         /**
 248          * Generate wikitext showing extensions name, URL, author and description.
 249          *
 250          * @return String: Wikitext
 251          */
 252         function getExtensionCredits() {
 253                 global $wgExtensionCredits, $wgExtensionFunctions, $wgParser, $wgSkinExtensionFunctions;
 254
 255                 if ( !count( $wgExtensionCredits ) && !count( $wgExtensionFunctions ) && !count( $wgSkinExtensionFunctions ) ) {
 256                         return '';
 257                 }
 258
 259                 $extensionTypes = self::getExtensionTypes();
 260
 261                 /**
 262                  * @deprecated as of 1.17, use hook ExtensionTypes instead.
 263                  */
 264                 wfRunHooks( 'SpecialVersionExtensionTypes', array( &$this, &$extensionTypes ) );
 265
 266                 $out = Xml::element( 'h2', array( 'id' => 'mw-version-ext' ), wfMsg( 'version-extensions' ) ) .
 267                         Xml::openElement( 'table', array( 'class' => 'wikitable', 'id' => 'sv-ext' ) );
 268
 269                 // Make sure the 'other' type is set to an array.
 270                 if ( !array_key_exists( 'other', $wgExtensionCredits ) ) {
 271                         $wgExtensionCredits['other'] = array();
 272                 }
 273
 274                 // Find all extensions that do not have a valid type and give them the type 'other'.
 275                 foreach ( $wgExtensionCredits as $type => $extensions ) {
 276                         if ( !array_key_exists( $type, $extensionTypes ) ) {
 277                                 $wgExtensionCredits['other'] = array_merge( $wgExtensionCredits['other'], $extensions );
 278                         }
 279                 }
 280
 281                 // Loop through the extension categories to display their extensions in the list.
 282                 foreach ( $extensionTypes as $type => $message ) {
 283                         if ( $type != 'other' ) {
 284                                 $out .= $this->getExtensionCategory( $type, $message );
 285                         }
 286                 }
 287
 288                 // We want the 'other' type to be last in the list.
 289                 $out .= $this->getExtensionCategory( 'other', $extensionTypes['other'] );
 290
 291                 if ( count( $wgExtensionFunctions ) ) {
 292                         $out .= $this->openExtType( wfMsg( 'version-extension-functions' ), 'extension-functions' );
 293                         $out .= '<tr><td colspan="4">' . $this->listToText( $wgExtensionFunctions ) . "</td></tr>\n";
 294                 }
 295
 296                 if ( $cnt = count( $tags = $wgParser->getTags() ) ) {
 297                         for ( $i = 0; $i < $cnt; ++$i )
 298                                 $tags[$i] = "&lt;{$tags[$i]}&gt;";
 299                         $out .= $this->openExtType( wfMsg( 'version-parser-extensiontags' ), 'parser-tags' );
 300                         $out .= '<tr><td colspan="4">' . $this->listToText( $tags ). "</td></tr>\n";
 301                 }
 302
 303                 if( $cnt = count( $fhooks = $wgParser->getFunctionHooks() ) ) {
 304                         $out .= $this->openExtType( wfMsg( 'version-parser-function-hooks' ), 'parser-function-hooks' );
 305                         $out .= '<tr><td colspan="4">' . $this->listToText( $fhooks ) . "</td></tr>\n";
 306                 }
 307
 308                 if ( count( $wgSkinExtensionFunctions ) ) {
 309                         $out .= $this->openExtType( wfMsg( 'version-skin-extension-functions' ), 'skin-extension-functions' );
 310                         $out .= '<tr><td colspan="4">' . $this->listToText( $wgSkinExtensionFunctions ) . "</td></tr>\n";
 311                 }
 312
 313                 $out .= Xml::closeElement( 'table' );
 314
 315                 return $out;
 316         }
 317
 318         /**
 319          * Creates and returns the HTML for a single extension category.
 320          *
 321          * @since 1.17
 322          *
 323          * @param $type String
 324          * @param $message String
 325          *
 326          * @return string
 327          */
 328         protected function getExtensionCategory( $type, $message ) {
 329                 global $wgExtensionCredits;
 330
 331                 $out = '';
 332
 333                 if ( array_key_exists( $type, $wgExtensionCredits ) && count( $wgExtensionCredits[$type] ) > 0 ) {
 334                         $out .= $this->openExtType( $message, 'credits-' . $type );
 335
 336                         usort( $wgExtensionCredits[$type], array( $this, 'compare' ) );
 337
 338                         foreach ( $wgExtensionCredits[$type] as $extension ) {
 339                                 $out .= $this->getCreditsForExtension( $extension );
 340                         }
 341                 }
 342
 343                 return $out;
 344         }
 345
 346         /**
 347          * Callback to sort extensions by type.
 348          */
 349         function compare( $a, $b ) {
 350                 global $wgLang;
 351                 if( $a['name'] === $b['name'] ) {
 352                         return 0;
 353                 } else {
 354                         return $wgLang->lc( $a['name'] ) > $wgLang->lc( $b['name'] )
 355                                 ? 1
 356                                 : -1;
 357                 }
 358         }
 359
 360         /**
 361          * Creates and formats the creidts for a single extension and returns this.
 362          *
 363          * @param $extension Array
 364          *
 365          * @return string
 366          */
 367         function getCreditsForExtension( array $extension ) {
 368                 $name = isset( $extension['name'] ) ? $extension['name'] : '[no name]';
 369
 370                 if ( isset( $extension['path'] ) ) {
 371                         $svnInfo = self::getSvnInfo( dirname($extension['path']) );
 372                         $directoryRev = isset( $svnInfo['directory-rev'] ) ? $svnInfo['directory-rev'] : null;
 373                         $checkoutRev = isset( $svnInfo['checkout-rev'] ) ? $svnInfo['checkout-rev'] : null;
 374                         $viewvcUrl = isset( $svnInfo['viewvc-url'] ) ? $svnInfo['viewvc-url'] : null;
 375                 } else {
 376                         $directoryRev = null;
 377                         $checkoutRev = null;
 378                         $viewvcUrl = null;
 379                 }
 380
 381                 # Make main link (or just the name if there is no URL).
 382                 if ( isset( $extension['url'] ) ) {
 383                         $mainLink = "[{$extension['url']} $name]";
 384                 } else {
 385                         $mainLink = $name;
 386                 }
 387
 388                 if ( isset( $extension['version'] ) ) {
 389                         $versionText = '<span class="mw-version-ext-version">' .
 390                                 wfMsg( 'version-version', $extension['version'] ) .
 391                                 '</span>';
 392                 } else {
 393                         $versionText = '';
 394                 }
 395
 396                 # Make subversion text/link.
 397                 if ( $checkoutRev ) {
 398                         $svnText = wfMsg( 'version-svn-revision', $directoryRev, $checkoutRev );
 399                         $svnText = isset( $viewvcUrl ) ? "[$viewvcUrl $svnText]" : $svnText;
 400                 } else {
 401                         $svnText = false;
 402                 }
 403
 404                 # Make description text.
 405                 $description = isset ( $extension['description'] ) ? $extension['description'] : '';
 406
 407                 if( isset ( $extension['descriptionmsg'] ) ) {
 408                         # Look for a localized description.
 409                         $descriptionMsg = $extension['descriptionmsg'];
 410
 411                         if( is_array( $descriptionMsg ) ) {
 412                                 $descriptionMsgKey = $descriptionMsg[0]; // Get the message key
 413                                 array_shift( $descriptionMsg ); // Shift out the message key to get the parameters only
 414                                 array_map( "htmlspecialchars", $descriptionMsg ); // For sanity
 415                                 $msg = wfMsg( $descriptionMsgKey, $descriptionMsg );
 416                         } else {
 417                                 $msg = wfMsg( $descriptionMsg );
 418                         }
 419                         if ( !wfEmptyMsg( $descriptionMsg, $msg ) && $msg != '' ) {
 420                                 $description = $msg;
 421                         }
 422                 }
 423
 424                 if ( $svnText !== false ) {
 425                         $extNameVer = "<tr>
 426                                 <td><em>$mainLink $versionText</em></td>
 427                                 <td><em>$svnText</em></td>";
 428                 } else {
 429                         $extNameVer = "<tr>
 430                                 <td colspan=\"2\"><em>$mainLink $versionText</em></td>";
 431                 }
 432
 433                 $author = isset ( $extension['author'] ) ? $extension['author'] : array();
 434                 $extDescAuthor = "<td>$description</td>
 435                         <td>" . $this->listToText( (array)$author, false ) . "</td>
 436                         </tr>\n";
 437
 438                 return $extNameVer . $extDescAuthor;
 439         }
 440
 441         /**
 442          * Generate wikitext showing hooks in $wgHooks.
 443          *
 444          * @return String: wikitext
 445          */
 446         private function getWgHooks() {
 447                 global $wgHooks;
 448
 449                 if ( count( $wgHooks ) ) {
 450                         $myWgHooks = $wgHooks;
 451                         ksort( $myWgHooks );
 452
 453                         $ret = Xml::element( 'h2', array( 'id' => 'mw-version-hooks' ), wfMsg( 'version-hooks' ) ) .
 454                                 Xml::openElement( 'table', array( 'class' => 'wikitable', 'id' => 'sv-hooks' ) ) .
 455                                 "<tr>
 456                                         <th>" . wfMsg( 'version-hook-name' ) . "</th>
 457                                         <th>" . wfMsg( 'version-hook-subscribedby' ) . "</th>
 458                                 </tr>\n";
 459
 460                         foreach ( $myWgHooks as $hook => $hooks )
 461                                 $ret .= "<tr>
 462                                                 <td>$hook</td>
 463                                                 <td>" . $this->listToText( $hooks ) . "</td>
 464                                         </tr>\n";
 465
 466                         $ret .= Xml::closeElement( 'table' );
 467                         return $ret;
 468                 } else
 469                         return '';
 470         }
 471
 472         private function openExtType( $text, $name = null ) {
 473                 $opt = array( 'colspan' => 4 );
 474                 $out = '';
 475
 476                 if( $this->firstExtOpened ) {
 477                         // Insert a spacing line
 478                         $out .= '<tr class="sv-space">' . Html::element( 'td', $opt ) . "</tr>\n";
 479                 }
 480                 $this->firstExtOpened = true;
 481
 482                 if( $name ) {
 483                         $opt['id'] = "sv-$name";
 484                 }
 485
 486                 $out .= "<tr>" . Xml::element( 'th', $opt, $text ) . "</tr>\n";
 487
 488                 return $out;
 489         }
 490
 491         /**
 492          * Get information about client's IP address.
 493          *
 494          * @return String: HTML fragment
 495          */
 496         private function IPInfo() {
 497                 $ip =  str_replace( '--', ' - ', htmlspecialchars( wfGetIP() ) );
 498                 return "<!-- visited from $ip -->\n" .
 499                         "<span style='display:none'>visited from $ip</span>";
 500         }
 501
 502         /**
 503          * Convert an array of items into a list for display.
 504          *
 505          * @param $list Array of elements to display
 506          * @param $sort Boolean: whether to sort the items in $list
 507          *
 508          * @return String
 509          */
 510         function listToText( $list, $sort = true ) {
 511                 $cnt = count( $list );
 512
 513                 if ( $cnt == 1 ) {
 514                         // Enforce always returning a string
 515                         return (string)self::arrayToString( $list[0] );
 516                 } elseif ( $cnt == 0 ) {
 517                         return '';
 518                 } else {
 519                         global $wgLang;
 520                         if ( $sort ) {
 521                                 sort( $list );
 522                         }
 523                         return $wgLang->listToText( array_map( array( __CLASS__, 'arrayToString' ), $list ) );
 524                 }
 525         }
 526
 527         /**
 528          * Convert an array or object to a string for display.
 529          *
 530          * @param $list Mixed: will convert an array to string if given and return
 531          *              the paramater unaltered otherwise
 532          *
 533          * @return Mixed
 534          */
 535         static function arrayToString( $list ) {
 536                 if( is_array( $list ) && count( $list ) == 1 )
 537                         $list = $list[0];
 538                 if( is_object( $list ) ) {
 539                         $class = get_class( $list );
 540                         return "($class)";
 541                 } elseif ( !is_array( $list ) ) {
 542                         return $list;
 543                 } else {
 544                         if( is_object( $list[0] ) )
 545                                 $class = get_class( $list[0] );
 546                         else
 547                                 $class = $list[0];
 548                         return "($class, {$list[1]})";
 549                 }
 550         }
 551
 552         /**
 553          * Get an associative array of information about a given path, from its .svn
 554          * subdirectory. Returns false on error, such as if the directory was not
 555          * checked out with subversion.
 556          *
 557          * Returned keys are:
 558          *    Required:
 559          *        checkout-rev          The revision which was checked out
 560          *    Optional:
 561          *        directory-rev         The revision when the directory was last modified
 562          *        url                   The subversion URL of the directory
 563          *        repo-url              The base URL of the repository
 564          *        viewvc-url            A ViewVC URL pointing to the checked-out revision
 565          */
 566         public static function getSvnInfo( $dir ) {
 567                 // http://svnbook.red-bean.com/nightly/en/svn.developer.insidewc.html
 568                 $entries = $dir . '/.svn/entries';
 569
 570                 if( !file_exists( $entries ) ) {
 571                         return false;
 572                 }
 573
 574                 $lines = file( $entries );
 575                 if ( !count( $lines ) ) {
 576                         return false;
 577                 }
 578
 579                 // check if file is xml (subversion release <= 1.3) or not (subversion release = 1.4)
 580                 if( preg_match( '/^<\?xml/', $lines[0] ) ) {
 581                         // subversion is release <= 1.3
 582                         if( !function_exists( 'simplexml_load_file' ) ) {
 583                                 // We could fall back to expat... YUCK
 584                                 return false;
 585                         }
 586
 587                         // SimpleXml whines about the xmlns...
 588                         wfSuppressWarnings();
 589                         $xml = simplexml_load_file( $entries );
 590                         wfRestoreWarnings();
 591
 592                         if( $xml ) {
 593                                 foreach( $xml->entry as $entry ) {
 594                                         if( $xml->entry[0]['name'] == '' ) {
 595                                                 // The directory entry should always have a revision marker.
 596                                                 if( $entry['revision'] ) {
 597                                                         return array( 'checkout-rev' => intval( $entry['revision'] ) );
 598                                                 }
 599                                         }
 600                                 }
 601                         }
 602
 603                         return false;
 604                 }
 605
 606                 // Subversion is release 1.4 or above.
 607                 if ( count( $lines ) < 11 ) {
 608                         return false;
 609                 }
 610
 611                 $info = array(
 612                         'checkout-rev' => intval( trim( $lines[3] ) ),
 613                         'url' => trim( $lines[4] ),
 614                         'repo-url' => trim( $lines[5] ),
 615                         'directory-rev' => intval( trim( $lines[10] ) )
 616                 );
 617
 618                 if ( isset( self::$viewvcUrls[$info['repo-url']] ) ) {
 619                         $viewvc = str_replace(
 620                                 $info['repo-url'],
 621                                 self::$viewvcUrls[$info['repo-url']],
 622                                 $info['url']
 623                         );
 624
 625                         $viewvc .= '/?pathrev=';
 626                         $viewvc .= urlencode( $info['checkout-rev'] );
 627                         $info['viewvc-url'] = $viewvc;
 628                 }
 629
 630                 return $info;
 631         }
 632
 633         /**
 634          * Retrieve the revision number of a Subversion working directory.
 635          *
 636          * @param $dir String: directory of the svn checkout
 637          *
 638          * @return Integer: revision number as int
 639          */
 640         public static function getSvnRevision( $dir ) {
 641                 $info = self::getSvnInfo( $dir );
 642
 643                 if ( $info === false ) {
 644                         return false;
 645                 } elseif ( isset( $info['checkout-rev'] ) ) {
 646                         return $info['checkout-rev'];
 647                 } else {
 648                         return false;
 649                 }
 650         }
 651
 652 }