includes/filebackend/FSFileBackend.php

   1 <?php
   2 /**
   3  * File system based backend.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup FileBackend
  22  * @author Aaron Schulz
  23  */
  24
  25 /**
  26  * @brief Class for a file system (FS) based file backend.
  27  *
  28  * All "containers" each map to a directory under the backend's base directory.
  29  * For backwards-compatibility, some container paths can be set to custom paths.
  30  * The wiki ID will not be used in any custom paths, so this should be avoided.
  31  *
  32  * Having directories with thousands of files will diminish performance.
  33  * Sharding can be accomplished by using FileRepo-style hash paths.
  34  *
  35  * Status messages should avoid mentioning the internal FS paths.
  36  * PHP warnings are assumed to be logged rather than output.
  37  *
  38  * @ingroup FileBackend
  39  * @since 1.19
  40  */
  41 class FSFileBackend extends FileBackendStore {
  42         /** @var string Directory holding the container directories */
  43         protected $basePath;
  44
  45         /** @var array Map of container names to root paths for custom container paths */
  46         protected $containerPaths = array();
  47
  48         /** @var int File permission mode */
  49         protected $fileMode;
  50
  51         /** @var string Required OS username to own files */
  52         protected $fileOwner;
  53
  54         /** @var string OS username running this script */
  55         protected $currentUser;
  56
  57         /** @var array */
  58         protected $hadWarningErrors = array();
  59
  60         /**
  61          * @see FileBackendStore::__construct()
  62          * Additional $config params include:
  63          *   - basePath       : File system directory that holds containers.
  64          *   - containerPaths : Map of container names to custom file system directories.
  65          *                      This should only be used for backwards-compatibility.
  66          *   - fileMode       : Octal UNIX file permissions to use on files stored.
  67          */
  68         public function __construct( array $config ) {
  69                 parent::__construct( $config );
  70
  71                 // Remove any possible trailing slash from directories
  72                 if ( isset( $config['basePath'] ) ) {
  73                         $this->basePath = rtrim( $config['basePath'], '/' ); // remove trailing slash
  74                 } else {
  75                         $this->basePath = null; // none; containers must have explicit paths
  76                 }
  77
  78                 if ( isset( $config['containerPaths'] ) ) {
  79                         $this->containerPaths = (array)$config['containerPaths'];
  80                         foreach ( $this->containerPaths as &$path ) {
  81                                 $path = rtrim( $path, '/' ); // remove trailing slash
  82                         }
  83                 }
  84
  85                 $this->fileMode = isset( $config['fileMode'] ) ? $config['fileMode'] : 0644;
  86                 if ( isset( $config['fileOwner'] ) && function_exists( 'posix_getuid' ) ) {
  87                         $this->fileOwner = $config['fileOwner'];
  88                         $info = posix_getpwuid( posix_getuid() );
  89                         $this->currentUser = $info['name']; // cache this, assuming it doesn't change
  90                 }
  91         }
  92
  93         public function getFeatures() {
  94                 return !wfIsWindows() ? FileBackend::ATTR_UNICODE_PATHS : 0;
  95         }
  96
  97         protected function resolveContainerPath( $container, $relStoragePath ) {
  98                 // Check that container has a root directory
  99                 if ( isset( $this->containerPaths[$container] ) || isset( $this->basePath ) ) {
 100                         // Check for sane relative paths (assume the base paths are OK)
 101                         if ( $this->isLegalRelPath( $relStoragePath ) ) {
 102                                 return $relStoragePath;
 103                         }
 104                 }
 105
 106                 return null;
 107         }
 108
 109         /**
 110          * Sanity check a relative file system path for validity
 111          *
 112          * @param string $path Normalized relative path
 113          * @return bool
 114          */
 115         protected function isLegalRelPath( $path ) {
 116                 // Check for file names longer than 255 chars
 117                 if ( preg_match( '![^/]{256}!', $path ) ) { // ext3/NTFS
 118                         return false;
 119                 }
 120                 if ( wfIsWindows() ) { // NTFS
 121                         return !preg_match( '![:*?"<>|]!', $path );
 122                 } else {
 123                         return true;
 124                 }
 125         }
 126
 127         /**
 128          * Given the short (unresolved) and full (resolved) name of
 129          * a container, return the file system path of the container.
 130          *
 131          * @param string $shortCont
 132          * @param string $fullCont
 133          * @return string|null
 134          */
 135         protected function containerFSRoot( $shortCont, $fullCont ) {
 136                 if ( isset( $this->containerPaths[$shortCont] ) ) {
 137                         return $this->containerPaths[$shortCont];
 138                 } elseif ( isset( $this->basePath ) ) {
 139                         return "{$this->basePath}/{$fullCont}";
 140                 }
 141
 142                 return null; // no container base path defined
 143         }
 144
 145         /**
 146          * Get the absolute file system path for a storage path
 147          *
 148          * @param string $storagePath Storage path
 149          * @return string|null
 150          */
 151         protected function resolveToFSPath( $storagePath ) {
 152                 list( $fullCont, $relPath ) = $this->resolveStoragePathReal( $storagePath );
 153                 if ( $relPath === null ) {
 154                         return null; // invalid
 155                 }
 156                 list( , $shortCont, ) = FileBackend::splitStoragePath( $storagePath );
 157                 $fsPath = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 158                 if ( $relPath != '' ) {
 159                         $fsPath .= "/{$relPath}";
 160                 }
 161
 162                 return $fsPath;
 163         }
 164
 165         public function isPathUsableInternal( $storagePath ) {
 166                 $fsPath = $this->resolveToFSPath( $storagePath );
 167                 if ( $fsPath === null ) {
 168                         return false; // invalid
 169                 }
 170                 $parentDir = dirname( $fsPath );
 171
 172                 if ( file_exists( $fsPath ) ) {
 173                         $ok = is_file( $fsPath ) && is_writable( $fsPath );
 174                 } else {
 175                         $ok = is_dir( $parentDir ) && is_writable( $parentDir );
 176                 }
 177
 178                 if ( $this->fileOwner !== null && $this->currentUser !== $this->fileOwner ) {
 179                         $ok = false;
 180                         trigger_error( __METHOD__ . ": PHP process owner is not '{$this->fileOwner}'." );
 181                 }
 182
 183                 return $ok;
 184         }
 185
 186         protected function doCreateInternal( array $params ) {
 187                 $status = Status::newGood();
 188
 189                 $dest = $this->resolveToFSPath( $params['dst'] );
 190                 if ( $dest === null ) {
 191                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 192
 193                         return $status;
 194                 }
 195
 196                 if ( !empty( $params['async'] ) ) { // deferred
 197                         $tempFile = TempFSFile::factory( 'create_', 'tmp' );
 198                         if ( !$tempFile ) {
 199                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 200
 201                                 return $status;
 202                         }
 203                         $this->trapWarnings();
 204                         $bytes = file_put_contents( $tempFile->getPath(), $params['content'] );
 205                         $this->untrapWarnings();
 206                         if ( $bytes === false ) {
 207                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 208
 209                                 return $status;
 210                         }
 211                         $cmd = implode( ' ', array(
 212                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 213                                 wfEscapeShellArg( $this->cleanPathSlashes( $tempFile->getPath() ) ),
 214                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 215                         ) );
 216                         $handler = function ( $errors, Status $status, array $params, $cmd ) {
 217                                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 218                                         $status->fatal( 'backend-fail-create', $params['dst'] );
 219                                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 220                                 }
 221                         };
 222                         $status->value = new FSFileOpHandle( $this, $params, $handler, $cmd, $dest );
 223                         $tempFile->bind( $status->value );
 224                 } else { // immediate write
 225                         $this->trapWarnings();
 226                         $bytes = file_put_contents( $dest, $params['content'] );
 227                         $this->untrapWarnings();
 228                         if ( $bytes === false ) {
 229                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 230
 231                                 return $status;
 232                         }
 233                         $this->chmod( $dest );
 234                 }
 235
 236                 return $status;
 237         }
 238
 239         protected function doStoreInternal( array $params ) {
 240                 $status = Status::newGood();
 241
 242                 $dest = $this->resolveToFSPath( $params['dst'] );
 243                 if ( $dest === null ) {
 244                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 245
 246                         return $status;
 247                 }
 248
 249                 if ( !empty( $params['async'] ) ) { // deferred
 250                         $cmd = implode( ' ', array(
 251                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 252                                 wfEscapeShellArg( $this->cleanPathSlashes( $params['src'] ) ),
 253                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 254                         ) );
 255                         $handler = function ( $errors, Status $status, array $params, $cmd ) {
 256                                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 257                                         $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 258                                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 259                                 }
 260                         };
 261                         $status->value = new FSFileOpHandle( $this, $params, $handler, $cmd, $dest );
 262                 } else { // immediate write
 263                         $this->trapWarnings();
 264                         $ok = copy( $params['src'], $dest );
 265                         $this->untrapWarnings();
 266                         // In some cases (at least over NFS), copy() returns true when it fails
 267                         if ( !$ok || ( filesize( $params['src'] ) !== filesize( $dest ) ) ) {
 268                                 if ( $ok ) { // PHP bug
 269                                         unlink( $dest ); // remove broken file
 270                                         trigger_error( __METHOD__ . ": copy() failed but returned true." );
 271                                 }
 272                                 $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 273
 274                                 return $status;
 275                         }
 276                         $this->chmod( $dest );
 277                 }
 278
 279                 return $status;
 280         }
 281
 282         protected function doCopyInternal( array $params ) {
 283                 $status = Status::newGood();
 284
 285                 $source = $this->resolveToFSPath( $params['src'] );
 286                 if ( $source === null ) {
 287                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 288
 289                         return $status;
 290                 }
 291
 292                 $dest = $this->resolveToFSPath( $params['dst'] );
 293                 if ( $dest === null ) {
 294                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 295
 296                         return $status;
 297                 }
 298
 299                 if ( !is_file( $source ) ) {
 300                         if ( empty( $params['ignoreMissingSource'] ) ) {
 301                                 $status->fatal( 'backend-fail-copy', $params['src'] );
 302                         }
 303
 304                         return $status; // do nothing; either OK or bad status
 305                 }
 306
 307                 if ( !empty( $params['async'] ) ) { // deferred
 308                         $cmd = implode( ' ', array(
 309                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 310                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) ),
 311                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 312                         ) );
 313                         $handler = function ( $errors, Status $status, array $params, $cmd ) {
 314                                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 315                                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 316                                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 317                                 }
 318                         };
 319                         $status->value = new FSFileOpHandle( $this, $params, $handler, $cmd, $dest );
 320                 } else { // immediate write
 321                         $this->trapWarnings();
 322                         $ok = ( $source === $dest ) ? true : copy( $source, $dest );
 323                         $this->untrapWarnings();
 324                         // In some cases (at least over NFS), copy() returns true when it fails
 325                         if ( !$ok || ( filesize( $source ) !== filesize( $dest ) ) ) {
 326                                 if ( $ok ) { // PHP bug
 327                                         $this->trapWarnings();
 328                                         unlink( $dest ); // remove broken file
 329                                         $this->untrapWarnings();
 330                                         trigger_error( __METHOD__ . ": copy() failed but returned true." );
 331                                 }
 332                                 $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 333
 334                                 return $status;
 335                         }
 336                         $this->chmod( $dest );
 337                 }
 338
 339                 return $status;
 340         }
 341
 342         protected function doMoveInternal( array $params ) {
 343                 $status = Status::newGood();
 344
 345                 $source = $this->resolveToFSPath( $params['src'] );
 346                 if ( $source === null ) {
 347                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 348
 349                         return $status;
 350                 }
 351
 352                 $dest = $this->resolveToFSPath( $params['dst'] );
 353                 if ( $dest === null ) {
 354                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 355
 356                         return $status;
 357                 }
 358
 359                 if ( !is_file( $source ) ) {
 360                         if ( empty( $params['ignoreMissingSource'] ) ) {
 361                                 $status->fatal( 'backend-fail-move', $params['src'] );
 362                         }
 363
 364                         return $status; // do nothing; either OK or bad status
 365                 }
 366
 367                 if ( !empty( $params['async'] ) ) { // deferred
 368                         $cmd = implode( ' ', array(
 369                                 wfIsWindows() ? 'MOVE /Y' : 'mv', // (overwrite)
 370                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) ),
 371                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 372                         ) );
 373                         $handler = function ( $errors, Status $status, array $params, $cmd ) {
 374                                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 375                                         $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 376                                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 377                                 }
 378                         };
 379                         $status->value = new FSFileOpHandle( $this, $params, $handler, $cmd );
 380                 } else { // immediate write
 381                         $this->trapWarnings();
 382                         $ok = ( $source === $dest ) ? true : rename( $source, $dest );
 383                         $this->untrapWarnings();
 384                         clearstatcache(); // file no longer at source
 385                         if ( !$ok ) {
 386                                 $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 387
 388                                 return $status;
 389                         }
 390                 }
 391
 392                 return $status;
 393         }
 394
 395         protected function doDeleteInternal( array $params ) {
 396                 $status = Status::newGood();
 397
 398                 $source = $this->resolveToFSPath( $params['src'] );
 399                 if ( $source === null ) {
 400                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 401
 402                         return $status;
 403                 }
 404
 405                 if ( !is_file( $source ) ) {
 406                         if ( empty( $params['ignoreMissingSource'] ) ) {
 407                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 408                         }
 409
 410                         return $status; // do nothing; either OK or bad status
 411                 }
 412
 413                 if ( !empty( $params['async'] ) ) { // deferred
 414                         $cmd = implode( ' ', array(
 415                                 wfIsWindows() ? 'DEL' : 'unlink',
 416                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) )
 417                         ) );
 418                         $handler = function ( $errors, Status $status, array $params, $cmd ) {
 419                                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 420                                         $status->fatal( 'backend-fail-delete', $params['src'] );
 421                                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 422                                 }
 423                         };
 424                         $status->value = new FSFileOpHandle( $this, $params, $handler, $cmd );
 425                 } else { // immediate write
 426                         $this->trapWarnings();
 427                         $ok = unlink( $source );
 428                         $this->untrapWarnings();
 429                         if ( !$ok ) {
 430                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 431
 432                                 return $status;
 433                         }
 434                 }
 435
 436                 return $status;
 437         }
 438
 439         /**
 440          * @param string $fullCont
 441          * @param string $dirRel
 442          * @param array $params
 443          * @return Status
 444          */
 445         protected function doPrepareInternal( $fullCont, $dirRel, array $params ) {
 446                 $status = Status::newGood();
 447                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 448                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 449                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 450                 $existed = is_dir( $dir ); // already there?
 451                 // Create the directory and its parents as needed...
 452                 $this->trapWarnings();
 453                 if ( !wfMkdirParents( $dir ) ) {
 454                         $status->fatal( 'directorycreateerror', $params['dir'] ); // fails on races
 455                 } elseif ( !is_writable( $dir ) ) {
 456                         $status->fatal( 'directoryreadonlyerror', $params['dir'] );
 457                 } elseif ( !is_readable( $dir ) ) {
 458                         $status->fatal( 'directorynotreadableerror', $params['dir'] );
 459                 }
 460                 $this->untrapWarnings();
 461                 // Respect any 'noAccess' or 'noListing' flags...
 462                 if ( is_dir( $dir ) && !$existed ) {
 463                         $status->merge( $this->doSecureInternal( $fullCont, $dirRel, $params ) );
 464                 }
 465
 466                 return $status;
 467         }
 468
 469         protected function doSecureInternal( $fullCont, $dirRel, array $params ) {
 470                 $status = Status::newGood();
 471                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 472                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 473                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 474                 // Seed new directories with a blank index.html, to prevent crawling...
 475                 if ( !empty( $params['noListing'] ) && !file_exists( "{$dir}/index.html" ) ) {
 476                         $this->trapWarnings();
 477                         $bytes = file_put_contents( "{$dir}/index.html", $this->indexHtmlPrivate() );
 478                         $this->untrapWarnings();
 479                         if ( $bytes === false ) {
 480                                 $status->fatal( 'backend-fail-create', $params['dir'] . '/index.html' );
 481                         }
 482                 }
 483                 // Add a .htaccess file to the root of the container...
 484                 if ( !empty( $params['noAccess'] ) && !file_exists( "{$contRoot}/.htaccess" ) ) {
 485                         $this->trapWarnings();
 486                         $bytes = file_put_contents( "{$contRoot}/.htaccess", $this->htaccessPrivate() );
 487                         $this->untrapWarnings();
 488                         if ( $bytes === false ) {
 489                                 $storeDir = "mwstore://{$this->name}/{$shortCont}";
 490                                 $status->fatal( 'backend-fail-create', "{$storeDir}/.htaccess" );
 491                         }
 492                 }
 493
 494                 return $status;
 495         }
 496
 497         protected function doPublishInternal( $fullCont, $dirRel, array $params ) {
 498                 $status = Status::newGood();
 499                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 500                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 501                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 502                 // Unseed new directories with a blank index.html, to allow crawling...
 503                 if ( !empty( $params['listing'] ) && is_file( "{$dir}/index.html" ) ) {
 504                         $exists = ( file_get_contents( "{$dir}/index.html" ) === $this->indexHtmlPrivate() );
 505                         $this->trapWarnings();
 506                         if ( $exists && !unlink( "{$dir}/index.html" ) ) { // reverse secure()
 507                                 $status->fatal( 'backend-fail-delete', $params['dir'] . '/index.html' );
 508                         }
 509                         $this->untrapWarnings();
 510                 }
 511                 // Remove the .htaccess file from the root of the container...
 512                 if ( !empty( $params['access'] ) && is_file( "{$contRoot}/.htaccess" ) ) {
 513                         $exists = ( file_get_contents( "{$contRoot}/.htaccess" ) === $this->htaccessPrivate() );
 514                         $this->trapWarnings();
 515                         if ( $exists && !unlink( "{$contRoot}/.htaccess" ) ) { // reverse secure()
 516                                 $storeDir = "mwstore://{$this->name}/{$shortCont}";
 517                                 $status->fatal( 'backend-fail-delete', "{$storeDir}/.htaccess" );
 518                         }
 519                         $this->untrapWarnings();
 520                 }
 521
 522                 return $status;
 523         }
 524
 525         protected function doCleanInternal( $fullCont, $dirRel, array $params ) {
 526                 $status = Status::newGood();
 527                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 528                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 529                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 530                 $this->trapWarnings();
 531                 if ( is_dir( $dir ) ) {
 532                         rmdir( $dir ); // remove directory if empty
 533                 }
 534                 $this->untrapWarnings();
 535
 536                 return $status;
 537         }
 538
 539         protected function doGetFileStat( array $params ) {
 540                 $source = $this->resolveToFSPath( $params['src'] );
 541                 if ( $source === null ) {
 542                         return false; // invalid storage path
 543                 }
 544
 545                 $this->trapWarnings(); // don't trust 'false' if there were errors
 546                 $stat = is_file( $source ) ? stat( $source ) : false; // regular files only
 547                 $hadError = $this->untrapWarnings();
 548
 549                 if ( $stat ) {
 550                         return array(
 551                                 'mtime' => wfTimestamp( TS_MW, $stat['mtime'] ),
 552                                 'size' => $stat['size']
 553                         );
 554                 } elseif ( !$hadError ) {
 555                         return false; // file does not exist
 556                 } else {
 557                         return null; // failure
 558                 }
 559         }
 560
 561         /**
 562          * @see FileBackendStore::doClearCache()
 563          */
 564         protected function doClearCache( array $paths = null ) {
 565                 clearstatcache(); // clear the PHP file stat cache
 566         }
 567
 568         protected function doDirectoryExists( $fullCont, $dirRel, array $params ) {
 569                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 570                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 571                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 572
 573                 $this->trapWarnings(); // don't trust 'false' if there were errors
 574                 $exists = is_dir( $dir );
 575                 $hadError = $this->untrapWarnings();
 576
 577                 return $hadError ? null : $exists;
 578         }
 579
 580         /**
 581          * @see FileBackendStore::getDirectoryListInternal()
 582          * @param string $fullCont
 583          * @param string $dirRel
 584          * @param array $params
 585          * @return array|null
 586          */
 587         public function getDirectoryListInternal( $fullCont, $dirRel, array $params ) {
 588                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 589                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 590                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 591                 $exists = is_dir( $dir );
 592                 if ( !$exists ) {
 593                         wfDebug( __METHOD__ . "() given directory does not exist: '$dir'\n" );
 594
 595                         return array(); // nothing under this dir
 596                 } elseif ( !is_readable( $dir ) ) {
 597                         wfDebug( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
 598
 599                         return null; // bad permissions?
 600                 }
 601
 602                 return new FSFileBackendDirList( $dir, $params );
 603         }
 604
 605         /**
 606          * @see FileBackendStore::getFileListInternal()
 607          * @param string $fullCont
 608          * @param string $dirRel
 609          * @param array $params
 610          * @return array|FSFileBackendFileList|null
 611          */
 612         public function getFileListInternal( $fullCont, $dirRel, array $params ) {
 613                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 614                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 615                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 616                 $exists = is_dir( $dir );
 617                 if ( !$exists ) {
 618                         wfDebug( __METHOD__ . "() given directory does not exist: '$dir'\n" );
 619
 620                         return array(); // nothing under this dir
 621                 } elseif ( !is_readable( $dir ) ) {
 622                         wfDebug( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
 623
 624                         return null; // bad permissions?
 625                 }
 626
 627                 return new FSFileBackendFileList( $dir, $params );
 628         }
 629
 630         protected function doGetLocalReferenceMulti( array $params ) {
 631                 $fsFiles = array(); // (path => FSFile)
 632
 633                 foreach ( $params['srcs'] as $src ) {
 634                         $source = $this->resolveToFSPath( $src );
 635                         if ( $source === null || !is_file( $source ) ) {
 636                                 $fsFiles[$src] = null; // invalid path or file does not exist
 637                         } else {
 638                                 $fsFiles[$src] = new FSFile( $source );
 639                         }
 640                 }
 641
 642                 return $fsFiles;
 643         }
 644
 645         protected function doGetLocalCopyMulti( array $params ) {
 646                 $tmpFiles = array(); // (path => TempFSFile)
 647
 648                 foreach ( $params['srcs'] as $src ) {
 649                         $source = $this->resolveToFSPath( $src );
 650                         if ( $source === null ) {
 651                                 $tmpFiles[$src] = null; // invalid path
 652                         } else {
 653                                 // Create a new temporary file with the same extension...
 654                                 $ext = FileBackend::extensionFromPath( $src );
 655                                 $tmpFile = TempFSFile::factory( 'localcopy_', $ext );
 656                                 if ( !$tmpFile ) {
 657                                         $tmpFiles[$src] = null;
 658                                 } else {
 659                                         $tmpPath = $tmpFile->getPath();
 660                                         // Copy the source file over the temp file
 661                                         $this->trapWarnings();
 662                                         $ok = copy( $source, $tmpPath );
 663                                         $this->untrapWarnings();
 664                                         if ( !$ok ) {
 665                                                 $tmpFiles[$src] = null;
 666                                         } else {
 667                                                 $this->chmod( $tmpPath );
 668                                                 $tmpFiles[$src] = $tmpFile;
 669                                         }
 670                                 }
 671                         }
 672                 }
 673
 674                 return $tmpFiles;
 675         }
 676
 677         protected function directoriesAreVirtual() {
 678                 return false;
 679         }
 680
 681         protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
 682                 $statuses = array();
 683
 684                 $pipes = array();
 685                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
 686                         $pipes[$index] = popen( "{$fileOpHandle->cmd} 2>&1", 'r' );
 687                 }
 688
 689                 $errs = array();
 690                 foreach ( $pipes as $index => $pipe ) {
 691                         // Result will be empty on success in *NIX. On Windows,
 692                         // it may be something like "        1 file(s) [copied|moved].".
 693                         $errs[$index] = stream_get_contents( $pipe );
 694                         fclose( $pipe );
 695                 }
 696
 697                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
 698                         $status = Status::newGood();
 699                         $function = $fileOpHandle->call;
 700                         $function( $errs[$index], $status, $fileOpHandle->params, $fileOpHandle->cmd );
 701                         $statuses[$index] = $status;
 702                         if ( $status->isOK() && $fileOpHandle->chmodPath ) {
 703                                 $this->chmod( $fileOpHandle->chmodPath );
 704                         }
 705                 }
 706
 707                 clearstatcache(); // files changed
 708                 return $statuses;
 709         }
 710
 711         /**
 712          * Chmod a file, suppressing the warnings
 713          *
 714          * @param string $path Absolute file system path
 715          * @return bool Success
 716          */
 717         protected function chmod( $path ) {
 718                 $this->trapWarnings();
 719                 $ok = chmod( $path, $this->fileMode );
 720                 $this->untrapWarnings();
 721
 722                 return $ok;
 723         }
 724
 725         /**
 726          * Return the text of an index.html file to hide directory listings
 727          *
 728          * @return string
 729          */
 730         protected function indexHtmlPrivate() {
 731                 return '';
 732         }
 733
 734         /**
 735          * Return the text of a .htaccess file to make a directory private
 736          *
 737          * @return string
 738          */
 739         protected function htaccessPrivate() {
 740                 return "Deny from all\n";
 741         }
 742
 743         /**
 744          * Clean up directory separators for the given OS
 745          *
 746          * @param string $path FS path
 747          * @return string
 748          */
 749         protected function cleanPathSlashes( $path ) {
 750                 return wfIsWindows() ? strtr( $path, '/', '\\' ) : $path;
 751         }
 752
 753         /**
 754          * Listen for E_WARNING errors and track whether any happen
 755          */
 756         protected function trapWarnings() {
 757                 $this->hadWarningErrors[] = false; // push to stack
 758                 set_error_handler( array( $this, 'handleWarning' ), E_WARNING );
 759         }
 760
 761         /**
 762          * Stop listening for E_WARNING errors and return true if any happened
 763          *
 764          * @return bool
 765          */
 766         protected function untrapWarnings() {
 767                 restore_error_handler(); // restore previous handler
 768                 return array_pop( $this->hadWarningErrors ); // pop from stack
 769         }
 770
 771         /**
 772          * @param int $errno
 773          * @param string $errstr
 774          * @return bool
 775          * @access private
 776          */
 777         public function handleWarning( $errno, $errstr ) {
 778                 wfDebugLog( 'FSFileBackend', $errstr ); // more detailed error logging
 779                 $this->hadWarningErrors[count( $this->hadWarningErrors ) - 1] = true;
 780
 781                 return true; // suppress from PHP handler
 782         }
 783 }
 784
 785 /**
 786  * @see FileBackendStoreOpHandle
 787  */
 788 class FSFileOpHandle extends FileBackendStoreOpHandle {
 789         public $cmd; // string; shell command
 790         public $chmodPath; // string; file to chmod
 791
 792         /**
 793          * @param FSFileBackend $backend
 794          * @param array $params
 795          * @param callable $call
 796          * @param string $cmd
 797          * @param int|null $chmodPath
 798          */
 799         public function __construct(
 800                 FSFileBackend $backend, array $params, $call, $cmd, $chmodPath = null
 801         ) {
 802                 $this->backend = $backend;
 803                 $this->params = $params;
 804                 $this->call = $call;
 805                 $this->cmd = $cmd;
 806                 $this->chmodPath = $chmodPath;
 807         }
 808 }
 809
 810 /**
 811  * Wrapper around RecursiveDirectoryIterator/DirectoryIterator that
 812  * catches exception or does any custom behavoir that we may want.
 813  * Do not use this class from places outside FSFileBackend.
 814  *
 815  * @ingroup FileBackend
 816  */
 817 abstract class FSFileBackendList implements Iterator {
 818         /** @var Iterator */
 819         protected $iter;
 820
 821         /** @var int */
 822         protected $suffixStart;
 823
 824         /** @var int */
 825         protected $pos = 0;
 826
 827         /** @var array */
 828         protected $params = array();
 829
 830         /**
 831          * @param string $dir File system directory
 832          * @param array $params
 833          */
 834         public function __construct( $dir, array $params ) {
 835                 $path = realpath( $dir ); // normalize
 836                 if ( $path === false ) {
 837                         $path = $dir;
 838                 }
 839                 $this->suffixStart = strlen( $path ) + 1; // size of "path/to/dir/"
 840                 $this->params = $params;
 841
 842                 try {
 843                         $this->iter = $this->initIterator( $path );
 844                 } catch ( UnexpectedValueException $e ) {
 845                         $this->iter = null; // bad permissions? deleted?
 846                 }
 847         }
 848
 849         /**
 850          * Return an appropriate iterator object to wrap
 851          *
 852          * @param string $dir File system directory
 853          * @return Iterator
 854          */
 855         protected function initIterator( $dir ) {
 856                 if ( !empty( $this->params['topOnly'] ) ) { // non-recursive
 857                         # Get an iterator that will get direct sub-nodes
 858                         return new DirectoryIterator( $dir );
 859                 } else { // recursive
 860                         # Get an iterator that will return leaf nodes (non-directories)
 861                         # RecursiveDirectoryIterator extends FilesystemIterator.
 862                         # FilesystemIterator::SKIP_DOTS default is inconsistent in PHP 5.3.x.
 863                         $flags = FilesystemIterator::CURRENT_AS_SELF | FilesystemIterator::SKIP_DOTS;
 864
 865                         return new RecursiveIteratorIterator(
 866                                 new RecursiveDirectoryIterator( $dir, $flags ),
 867                                 RecursiveIteratorIterator::CHILD_FIRST // include dirs
 868                         );
 869                 }
 870         }
 871
 872         /**
 873          * @see Iterator::key()
 874          * @return int
 875          */
 876         public function key() {
 877                 return $this->pos;
 878         }
 879
 880         /**
 881          * @see Iterator::current()
 882          * @return string|bool String or false
 883          */
 884         public function current() {
 885                 return $this->getRelPath( $this->iter->current()->getPathname() );
 886         }
 887
 888         /**
 889          * @see Iterator::next()
 890          * @throws FileBackendError
 891          */
 892         public function next() {
 893                 try {
 894                         $this->iter->next();
 895                         $this->filterViaNext();
 896                 } catch ( UnexpectedValueException $e ) { // bad permissions? deleted?
 897                         throw new FileBackendError( "File iterator gave UnexpectedValueException." );
 898                 }
 899                 ++$this->pos;
 900         }
 901
 902         /**
 903          * @see Iterator::rewind()
 904          * @throws FileBackendError
 905          */
 906         public function rewind() {
 907                 $this->pos = 0;
 908                 try {
 909                         $this->iter->rewind();
 910                         $this->filterViaNext();
 911                 } catch ( UnexpectedValueException $e ) { // bad permissions? deleted?
 912                         throw new FileBackendError( "File iterator gave UnexpectedValueException." );
 913                 }
 914         }
 915
 916         /**
 917          * @see Iterator::valid()
 918          * @return bool
 919          */
 920         public function valid() {
 921                 return $this->iter && $this->iter->valid();
 922         }
 923
 924         /**
 925          * Filter out items by advancing to the next ones
 926          */
 927         protected function filterViaNext() {
 928         }
 929
 930         /**
 931          * Return only the relative path and normalize slashes to FileBackend-style.
 932          * Uses the "real path" since the suffix is based upon that.
 933          *
 934          * @param string $dir
 935          * @return string
 936          */
 937         protected function getRelPath( $dir ) {
 938                 $path = realpath( $dir );
 939                 if ( $path === false ) {
 940                         $path = $dir;
 941                 }
 942
 943                 return strtr( substr( $path, $this->suffixStart ), '\\', '/' );
 944         }
 945 }
 946
 947 class FSFileBackendDirList extends FSFileBackendList {
 948         protected function filterViaNext() {
 949                 while ( $this->iter->valid() ) {
 950                         if ( $this->iter->current()->isDot() || !$this->iter->current()->isDir() ) {
 951                                 $this->iter->next(); // skip non-directories and dot files
 952                         } else {
 953                                 break;
 954                         }
 955                 }
 956         }
 957 }
 958
 959 class FSFileBackendFileList extends FSFileBackendList {
 960         protected function filterViaNext() {
 961                 while ( $this->iter->valid() ) {
 962                         if ( !$this->iter->current()->isFile() ) {
 963                                 $this->iter->next(); // skip non-files and dot files
 964                         } else {
 965                                 break;
 966                         }
 967                 }
 968         }
 969 }