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         protected function resolveContainerPath( $container, $relStoragePath ) {
  94                 // Check that container has a root directory
  95                 if ( isset( $this->containerPaths[$container] ) || isset( $this->basePath ) ) {
  96                         // Check for sane relative paths (assume the base paths are OK)
  97                         if ( $this->isLegalRelPath( $relStoragePath ) ) {
  98                                 return $relStoragePath;
  99                         }
 100                 }
 101
 102                 return null;
 103         }
 104
 105         /**
 106          * Sanity check a relative file system path for validity
 107          *
 108          * @param string $path Normalized relative path
 109          * @return bool
 110          */
 111         protected function isLegalRelPath( $path ) {
 112                 // Check for file names longer than 255 chars
 113                 if ( preg_match( '![^/]{256}!', $path ) ) { // ext3/NTFS
 114                         return false;
 115                 }
 116                 if ( wfIsWindows() ) { // NTFS
 117                         return !preg_match( '![:*?"<>|]!', $path );
 118                 } else {
 119                         return true;
 120                 }
 121         }
 122
 123         /**
 124          * Given the short (unresolved) and full (resolved) name of
 125          * a container, return the file system path of the container.
 126          *
 127          * @param string $shortCont
 128          * @param string $fullCont
 129          * @return string|null
 130          */
 131         protected function containerFSRoot( $shortCont, $fullCont ) {
 132                 if ( isset( $this->containerPaths[$shortCont] ) ) {
 133                         return $this->containerPaths[$shortCont];
 134                 } elseif ( isset( $this->basePath ) ) {
 135                         return "{$this->basePath}/{$fullCont}";
 136                 }
 137
 138                 return null; // no container base path defined
 139         }
 140
 141         /**
 142          * Get the absolute file system path for a storage path
 143          *
 144          * @param string $storagePath Storage path
 145          * @return string|null
 146          */
 147         protected function resolveToFSPath( $storagePath ) {
 148                 list( $fullCont, $relPath ) = $this->resolveStoragePathReal( $storagePath );
 149                 if ( $relPath === null ) {
 150                         return null; // invalid
 151                 }
 152                 list( , $shortCont, ) = FileBackend::splitStoragePath( $storagePath );
 153                 $fsPath = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 154                 if ( $relPath != '' ) {
 155                         $fsPath .= "/{$relPath}";
 156                 }
 157
 158                 return $fsPath;
 159         }
 160
 161         public function isPathUsableInternal( $storagePath ) {
 162                 $fsPath = $this->resolveToFSPath( $storagePath );
 163                 if ( $fsPath === null ) {
 164                         return false; // invalid
 165                 }
 166                 $parentDir = dirname( $fsPath );
 167
 168                 if ( file_exists( $fsPath ) ) {
 169                         $ok = is_file( $fsPath ) && is_writable( $fsPath );
 170                 } else {
 171                         $ok = is_dir( $parentDir ) && is_writable( $parentDir );
 172                 }
 173
 174                 if ( $this->fileOwner !== null && $this->currentUser !== $this->fileOwner ) {
 175                         $ok = false;
 176                         trigger_error( __METHOD__ . ": PHP process owner is not '{$this->fileOwner}'." );
 177                 }
 178
 179                 return $ok;
 180         }
 181
 182         protected function doCreateInternal( array $params ) {
 183                 $status = Status::newGood();
 184
 185                 $dest = $this->resolveToFSPath( $params['dst'] );
 186                 if ( $dest === null ) {
 187                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 188
 189                         return $status;
 190                 }
 191
 192                 if ( !empty( $params['async'] ) ) { // deferred
 193                         $tempFile = TempFSFile::factory( 'create_', 'tmp' );
 194                         if ( !$tempFile ) {
 195                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 196
 197                                 return $status;
 198                         }
 199                         $this->trapWarnings();
 200                         $bytes = file_put_contents( $tempFile->getPath(), $params['content'] );
 201                         $this->untrapWarnings();
 202                         if ( $bytes === false ) {
 203                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 204
 205                                 return $status;
 206                         }
 207                         $cmd = implode( ' ', array(
 208                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 209                                 wfEscapeShellArg( $this->cleanPathSlashes( $tempFile->getPath() ) ),
 210                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 211                         ) );
 212                         $status->value = new FSFileOpHandle( $this, $params, 'Create', $cmd, $dest );
 213                         $tempFile->bind( $status->value );
 214                 } else { // immediate write
 215                         $this->trapWarnings();
 216                         $bytes = file_put_contents( $dest, $params['content'] );
 217                         $this->untrapWarnings();
 218                         if ( $bytes === false ) {
 219                                 $status->fatal( 'backend-fail-create', $params['dst'] );
 220
 221                                 return $status;
 222                         }
 223                         $this->chmod( $dest );
 224                 }
 225
 226                 return $status;
 227         }
 228
 229         /**
 230          * @see FSFileBackend::doExecuteOpHandlesInternal()
 231          */
 232         protected function getResponseCreate( $errors, Status $status, array $params, $cmd ) {
 233                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 234                         $status->fatal( 'backend-fail-create', $params['dst'] );
 235                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 236                 }
 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                         $status->value = new FSFileOpHandle( $this, $params, 'Store', $cmd, $dest );
 256                 } else { // immediate write
 257                         $this->trapWarnings();
 258                         $ok = copy( $params['src'], $dest );
 259                         $this->untrapWarnings();
 260                         // In some cases (at least over NFS), copy() returns true when it fails
 261                         if ( !$ok || ( filesize( $params['src'] ) !== filesize( $dest ) ) ) {
 262                                 if ( $ok ) { // PHP bug
 263                                         unlink( $dest ); // remove broken file
 264                                         trigger_error( __METHOD__ . ": copy() failed but returned true." );
 265                                 }
 266                                 $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 267
 268                                 return $status;
 269                         }
 270                         $this->chmod( $dest );
 271                 }
 272
 273                 return $status;
 274         }
 275
 276         /**
 277          * @see FSFileBackend::doExecuteOpHandlesInternal()
 278          */
 279         protected function getResponseStore( $errors, Status $status, array $params, $cmd ) {
 280                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 281                         $status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
 282                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 283                 }
 284         }
 285
 286         protected function doCopyInternal( array $params ) {
 287                 $status = Status::newGood();
 288
 289                 $source = $this->resolveToFSPath( $params['src'] );
 290                 if ( $source === null ) {
 291                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 292
 293                         return $status;
 294                 }
 295
 296                 $dest = $this->resolveToFSPath( $params['dst'] );
 297                 if ( $dest === null ) {
 298                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 299
 300                         return $status;
 301                 }
 302
 303                 if ( !is_file( $source ) ) {
 304                         if ( empty( $params['ignoreMissingSource'] ) ) {
 305                                 $status->fatal( 'backend-fail-copy', $params['src'] );
 306                         }
 307
 308                         return $status; // do nothing; either OK or bad status
 309                 }
 310
 311                 if ( !empty( $params['async'] ) ) { // deferred
 312                         $cmd = implode( ' ', array(
 313                                 wfIsWindows() ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
 314                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) ),
 315                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 316                         ) );
 317                         $status->value = new FSFileOpHandle( $this, $params, 'Copy', $cmd, $dest );
 318                 } else { // immediate write
 319                         $this->trapWarnings();
 320                         $ok = ( $source === $dest ) ? true : copy( $source, $dest );
 321                         $this->untrapWarnings();
 322                         // In some cases (at least over NFS), copy() returns true when it fails
 323                         if ( !$ok || ( filesize( $source ) !== filesize( $dest ) ) ) {
 324                                 if ( $ok ) { // PHP bug
 325                                         $this->trapWarnings();
 326                                         unlink( $dest ); // remove broken file
 327                                         $this->untrapWarnings();
 328                                         trigger_error( __METHOD__ . ": copy() failed but returned true." );
 329                                 }
 330                                 $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 331
 332                                 return $status;
 333                         }
 334                         $this->chmod( $dest );
 335                 }
 336
 337                 return $status;
 338         }
 339
 340         /**
 341          * @see FSFileBackend::doExecuteOpHandlesInternal()
 342          */
 343         protected function getResponseCopy( $errors, Status $status, array $params, $cmd ) {
 344                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 345                         $status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
 346                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 347                 }
 348         }
 349
 350         protected function doMoveInternal( array $params ) {
 351                 $status = Status::newGood();
 352
 353                 $source = $this->resolveToFSPath( $params['src'] );
 354                 if ( $source === null ) {
 355                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 356
 357                         return $status;
 358                 }
 359
 360                 $dest = $this->resolveToFSPath( $params['dst'] );
 361                 if ( $dest === null ) {
 362                         $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 363
 364                         return $status;
 365                 }
 366
 367                 if ( !is_file( $source ) ) {
 368                         if ( empty( $params['ignoreMissingSource'] ) ) {
 369                                 $status->fatal( 'backend-fail-move', $params['src'] );
 370                         }
 371
 372                         return $status; // do nothing; either OK or bad status
 373                 }
 374
 375                 if ( !empty( $params['async'] ) ) { // deferred
 376                         $cmd = implode( ' ', array(
 377                                 wfIsWindows() ? 'MOVE /Y' : 'mv', // (overwrite)
 378                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) ),
 379                                 wfEscapeShellArg( $this->cleanPathSlashes( $dest ) )
 380                         ) );
 381                         $status->value = new FSFileOpHandle( $this, $params, 'Move', $cmd );
 382                 } else { // immediate write
 383                         $this->trapWarnings();
 384                         $ok = ( $source === $dest ) ? true : rename( $source, $dest );
 385                         $this->untrapWarnings();
 386                         clearstatcache(); // file no longer at source
 387                         if ( !$ok ) {
 388                                 $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 389
 390                                 return $status;
 391                         }
 392                 }
 393
 394                 return $status;
 395         }
 396
 397         /**
 398          * @see FSFileBackend::doExecuteOpHandlesInternal()
 399          */
 400         protected function getResponseMove( $errors, Status $status, array $params, $cmd ) {
 401                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 402                         $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 403                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 404                 }
 405         }
 406
 407         protected function doDeleteInternal( array $params ) {
 408                 $status = Status::newGood();
 409
 410                 $source = $this->resolveToFSPath( $params['src'] );
 411                 if ( $source === null ) {
 412                         $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 413
 414                         return $status;
 415                 }
 416
 417                 if ( !is_file( $source ) ) {
 418                         if ( empty( $params['ignoreMissingSource'] ) ) {
 419                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 420                         }
 421
 422                         return $status; // do nothing; either OK or bad status
 423                 }
 424
 425                 if ( !empty( $params['async'] ) ) { // deferred
 426                         $cmd = implode( ' ', array(
 427                                 wfIsWindows() ? 'DEL' : 'unlink',
 428                                 wfEscapeShellArg( $this->cleanPathSlashes( $source ) )
 429                         ) );
 430                         $status->value = new FSFileOpHandle( $this, $params, 'Copy', $cmd );
 431                 } else { // immediate write
 432                         $this->trapWarnings();
 433                         $ok = unlink( $source );
 434                         $this->untrapWarnings();
 435                         if ( !$ok ) {
 436                                 $status->fatal( 'backend-fail-delete', $params['src'] );
 437
 438                                 return $status;
 439                         }
 440                 }
 441
 442                 return $status;
 443         }
 444
 445         /**
 446          * @see FSFileBackend::doExecuteOpHandlesInternal()
 447          */
 448         protected function getResponseDelete( $errors, Status $status, array $params, $cmd ) {
 449                 if ( $errors !== '' && !( wfIsWindows() && $errors[0] === " " ) ) {
 450                         $status->fatal( 'backend-fail-delete', $params['src'] );
 451                         trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
 452                 }
 453         }
 454
 455         /**
 456          * @param string $fullCont
 457          * @param string $dirRel
 458          * @param array $params
 459          * @return Status
 460          */
 461         protected function doPrepareInternal( $fullCont, $dirRel, array $params ) {
 462                 $status = Status::newGood();
 463                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 464                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 465                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 466                 $existed = is_dir( $dir ); // already there?
 467                 // Create the directory and its parents as needed...
 468                 $this->trapWarnings();
 469                 if ( !wfMkdirParents( $dir ) ) {
 470                         $status->fatal( 'directorycreateerror', $params['dir'] ); // fails on races
 471                 } elseif ( !is_writable( $dir ) ) {
 472                         $status->fatal( 'directoryreadonlyerror', $params['dir'] );
 473                 } elseif ( !is_readable( $dir ) ) {
 474                         $status->fatal( 'directorynotreadableerror', $params['dir'] );
 475                 }
 476                 $this->untrapWarnings();
 477                 // Respect any 'noAccess' or 'noListing' flags...
 478                 if ( is_dir( $dir ) && !$existed ) {
 479                         $status->merge( $this->doSecureInternal( $fullCont, $dirRel, $params ) );
 480                 }
 481
 482                 return $status;
 483         }
 484
 485         protected function doSecureInternal( $fullCont, $dirRel, array $params ) {
 486                 $status = Status::newGood();
 487                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 488                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 489                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 490                 // Seed new directories with a blank index.html, to prevent crawling...
 491                 if ( !empty( $params['noListing'] ) && !file_exists( "{$dir}/index.html" ) ) {
 492                         $this->trapWarnings();
 493                         $bytes = file_put_contents( "{$dir}/index.html", $this->indexHtmlPrivate() );
 494                         $this->untrapWarnings();
 495                         if ( $bytes === false ) {
 496                                 $status->fatal( 'backend-fail-create', $params['dir'] . '/index.html' );
 497                         }
 498                 }
 499                 // Add a .htaccess file to the root of the container...
 500                 if ( !empty( $params['noAccess'] ) && !file_exists( "{$contRoot}/.htaccess" ) ) {
 501                         $this->trapWarnings();
 502                         $bytes = file_put_contents( "{$contRoot}/.htaccess", $this->htaccessPrivate() );
 503                         $this->untrapWarnings();
 504                         if ( $bytes === false ) {
 505                                 $storeDir = "mwstore://{$this->name}/{$shortCont}";
 506                                 $status->fatal( 'backend-fail-create', "{$storeDir}/.htaccess" );
 507                         }
 508                 }
 509
 510                 return $status;
 511         }
 512
 513         protected function doPublishInternal( $fullCont, $dirRel, array $params ) {
 514                 $status = Status::newGood();
 515                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 516                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 517                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 518                 // Unseed new directories with a blank index.html, to allow crawling...
 519                 if ( !empty( $params['listing'] ) && is_file( "{$dir}/index.html" ) ) {
 520                         $exists = ( file_get_contents( "{$dir}/index.html" ) === $this->indexHtmlPrivate() );
 521                         $this->trapWarnings();
 522                         if ( $exists && !unlink( "{$dir}/index.html" ) ) { // reverse secure()
 523                                 $status->fatal( 'backend-fail-delete', $params['dir'] . '/index.html' );
 524                         }
 525                         $this->untrapWarnings();
 526                 }
 527                 // Remove the .htaccess file from the root of the container...
 528                 if ( !empty( $params['access'] ) && is_file( "{$contRoot}/.htaccess" ) ) {
 529                         $exists = ( file_get_contents( "{$contRoot}/.htaccess" ) === $this->htaccessPrivate() );
 530                         $this->trapWarnings();
 531                         if ( $exists && !unlink( "{$contRoot}/.htaccess" ) ) { // reverse secure()
 532                                 $storeDir = "mwstore://{$this->name}/{$shortCont}";
 533                                 $status->fatal( 'backend-fail-delete', "{$storeDir}/.htaccess" );
 534                         }
 535                         $this->untrapWarnings();
 536                 }
 537
 538                 return $status;
 539         }
 540
 541         protected function doCleanInternal( $fullCont, $dirRel, array $params ) {
 542                 $status = Status::newGood();
 543                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 544                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 545                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 546                 $this->trapWarnings();
 547                 if ( is_dir( $dir ) ) {
 548                         rmdir( $dir ); // remove directory if empty
 549                 }
 550                 $this->untrapWarnings();
 551
 552                 return $status;
 553         }
 554
 555         protected function doGetFileStat( array $params ) {
 556                 $source = $this->resolveToFSPath( $params['src'] );
 557                 if ( $source === null ) {
 558                         return false; // invalid storage path
 559                 }
 560
 561                 $this->trapWarnings(); // don't trust 'false' if there were errors
 562                 $stat = is_file( $source ) ? stat( $source ) : false; // regular files only
 563                 $hadError = $this->untrapWarnings();
 564
 565                 if ( $stat ) {
 566                         return array(
 567                                 'mtime' => wfTimestamp( TS_MW, $stat['mtime'] ),
 568                                 'size' => $stat['size']
 569                         );
 570                 } elseif ( !$hadError ) {
 571                         return false; // file does not exist
 572                 } else {
 573                         return null; // failure
 574                 }
 575         }
 576
 577         /**
 578          * @see FileBackendStore::doClearCache()
 579          */
 580         protected function doClearCache( array $paths = null ) {
 581                 clearstatcache(); // clear the PHP file stat cache
 582         }
 583
 584         protected function doDirectoryExists( $fullCont, $dirRel, array $params ) {
 585                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 586                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 587                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 588
 589                 $this->trapWarnings(); // don't trust 'false' if there were errors
 590                 $exists = is_dir( $dir );
 591                 $hadError = $this->untrapWarnings();
 592
 593                 return $hadError ? null : $exists;
 594         }
 595
 596         /**
 597          * @see FileBackendStore::getDirectoryListInternal()
 598          * @param string $fullCont
 599          * @param string $dirRel
 600          * @param array $params
 601          * @return array|null
 602          */
 603         public function getDirectoryListInternal( $fullCont, $dirRel, array $params ) {
 604                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 605                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 606                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 607                 $exists = is_dir( $dir );
 608                 if ( !$exists ) {
 609                         wfDebug( __METHOD__ . "() given directory does not exist: '$dir'\n" );
 610
 611                         return array(); // nothing under this dir
 612                 } elseif ( !is_readable( $dir ) ) {
 613                         wfDebug( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
 614
 615                         return null; // bad permissions?
 616                 }
 617
 618                 return new FSFileBackendDirList( $dir, $params );
 619         }
 620
 621         /**
 622          * @see FileBackendStore::getFileListInternal()
 623          * @param string $fullCont
 624          * @param string $dirRel
 625          * @param array $params
 626          * @return array|FSFileBackendFileList|null
 627          */
 628         public function getFileListInternal( $fullCont, $dirRel, array $params ) {
 629                 list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
 630                 $contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
 631                 $dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
 632                 $exists = is_dir( $dir );
 633                 if ( !$exists ) {
 634                         wfDebug( __METHOD__ . "() given directory does not exist: '$dir'\n" );
 635
 636                         return array(); // nothing under this dir
 637                 } elseif ( !is_readable( $dir ) ) {
 638                         wfDebug( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
 639
 640                         return null; // bad permissions?
 641                 }
 642
 643                 return new FSFileBackendFileList( $dir, $params );
 644         }
 645
 646         protected function doGetLocalReferenceMulti( array $params ) {
 647                 $fsFiles = array(); // (path => FSFile)
 648
 649                 foreach ( $params['srcs'] as $src ) {
 650                         $source = $this->resolveToFSPath( $src );
 651                         if ( $source === null || !is_file( $source ) ) {
 652                                 $fsFiles[$src] = null; // invalid path or file does not exist
 653                         } else {
 654                                 $fsFiles[$src] = new FSFile( $source );
 655                         }
 656                 }
 657
 658                 return $fsFiles;
 659         }
 660
 661         protected function doGetLocalCopyMulti( array $params ) {
 662                 $tmpFiles = array(); // (path => TempFSFile)
 663
 664                 foreach ( $params['srcs'] as $src ) {
 665                         $source = $this->resolveToFSPath( $src );
 666                         if ( $source === null ) {
 667                                 $tmpFiles[$src] = null; // invalid path
 668                         } else {
 669                                 // Create a new temporary file with the same extension...
 670                                 $ext = FileBackend::extensionFromPath( $src );
 671                                 $tmpFile = TempFSFile::factory( 'localcopy_', $ext );
 672                                 if ( !$tmpFile ) {
 673                                         $tmpFiles[$src] = null;
 674                                 } else {
 675                                         $tmpPath = $tmpFile->getPath();
 676                                         // Copy the source file over the temp file
 677                                         $this->trapWarnings();
 678                                         $ok = copy( $source, $tmpPath );
 679                                         $this->untrapWarnings();
 680                                         if ( !$ok ) {
 681                                                 $tmpFiles[$src] = null;
 682                                         } else {
 683                                                 $this->chmod( $tmpPath );
 684                                                 $tmpFiles[$src] = $tmpFile;
 685                                         }
 686                                 }
 687                         }
 688                 }
 689
 690                 return $tmpFiles;
 691         }
 692
 693         protected function directoriesAreVirtual() {
 694                 return false;
 695         }
 696
 697         protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
 698                 $statuses = array();
 699
 700                 $pipes = array();
 701                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
 702                         $pipes[$index] = popen( "{$fileOpHandle->cmd} 2>&1", 'r' );
 703                 }
 704
 705                 $errs = array();
 706                 foreach ( $pipes as $index => $pipe ) {
 707                         // Result will be empty on success in *NIX. On Windows,
 708                         // it may be something like "        1 file(s) [copied|moved].".
 709                         $errs[$index] = stream_get_contents( $pipe );
 710                         fclose( $pipe );
 711                 }
 712
 713                 foreach ( $fileOpHandles as $index => $fileOpHandle ) {
 714                         $status = Status::newGood();
 715                         $function = 'getResponse' . $fileOpHandle->call;
 716                         $this->$function( $errs[$index], $status, $fileOpHandle->params, $fileOpHandle->cmd );
 717                         $statuses[$index] = $status;
 718                         if ( $status->isOK() && $fileOpHandle->chmodPath ) {
 719                                 $this->chmod( $fileOpHandle->chmodPath );
 720                         }
 721                 }
 722
 723                 clearstatcache(); // files changed
 724                 return $statuses;
 725         }
 726
 727         /**
 728          * Chmod a file, suppressing the warnings
 729          *
 730          * @param string $path Absolute file system path
 731          * @return bool Success
 732          */
 733         protected function chmod( $path ) {
 734                 $this->trapWarnings();
 735                 $ok = chmod( $path, $this->fileMode );
 736                 $this->untrapWarnings();
 737
 738                 return $ok;
 739         }
 740
 741         /**
 742          * Return the text of an index.html file to hide directory listings
 743          *
 744          * @return string
 745          */
 746         protected function indexHtmlPrivate() {
 747                 return '';
 748         }
 749
 750         /**
 751          * Return the text of a .htaccess file to make a directory private
 752          *
 753          * @return string
 754          */
 755         protected function htaccessPrivate() {
 756                 return "Deny from all\n";
 757         }
 758
 759         /**
 760          * Clean up directory separators for the given OS
 761          *
 762          * @param string $path FS path
 763          * @return string
 764          */
 765         protected function cleanPathSlashes( $path ) {
 766                 return wfIsWindows() ? strtr( $path, '/', '\\' ) : $path;
 767         }
 768
 769         /**
 770          * Listen for E_WARNING errors and track whether any happen
 771          */
 772         protected function trapWarnings() {
 773                 $this->hadWarningErrors[] = false; // push to stack
 774                 set_error_handler( array( $this, 'handleWarning' ), E_WARNING );
 775         }
 776
 777         /**
 778          * Stop listening for E_WARNING errors and return true if any happened
 779          *
 780          * @return bool
 781          */
 782         protected function untrapWarnings() {
 783                 restore_error_handler(); // restore previous handler
 784                 return array_pop( $this->hadWarningErrors ); // pop from stack
 785         }
 786
 787         /**
 788          * @param int $errno
 789          * @param string $errstr
 790          * @return bool
 791          * @access private
 792          */
 793         public function handleWarning( $errno, $errstr ) {
 794                 wfDebugLog( 'FSFileBackend', $errstr ); // more detailed error logging
 795                 $this->hadWarningErrors[count( $this->hadWarningErrors ) - 1] = true;
 796
 797                 return true; // suppress from PHP handler
 798         }
 799 }
 800
 801 /**
 802  * @see FileBackendStoreOpHandle
 803  */
 804 class FSFileOpHandle extends FileBackendStoreOpHandle {
 805         public $cmd; // string; shell command
 806         public $chmodPath; // string; file to chmod
 807
 808         /**
 809          * @param FSFileBackend $backend
 810          * @param array $params
 811          * @param string $call
 812          * @param string $cmd
 813          * @param int|null $chmodPath
 814          */
 815         public function __construct(
 816                 FSFileBackend $backend, array $params, $call, $cmd, $chmodPath = null
 817         ) {
 818                 $this->backend = $backend;
 819                 $this->params = $params;
 820                 $this->call = $call;
 821                 $this->cmd = $cmd;
 822                 $this->chmodPath = $chmodPath;
 823         }
 824 }
 825
 826 /**
 827  * Wrapper around RecursiveDirectoryIterator/DirectoryIterator that
 828  * catches exception or does any custom behavoir that we may want.
 829  * Do not use this class from places outside FSFileBackend.
 830  *
 831  * @ingroup FileBackend
 832  */
 833 abstract class FSFileBackendList implements Iterator {
 834         /** @var Iterator */
 835         protected $iter;
 836
 837         /** @var int */
 838         protected $suffixStart;
 839
 840         /** @var int */
 841         protected $pos = 0;
 842
 843         /** @var array */
 844         protected $params = array();
 845
 846         /**
 847          * @param string $dir file system directory
 848          * @param array $params
 849          */
 850         public function __construct( $dir, array $params ) {
 851                 $path = realpath( $dir ); // normalize
 852                 if ( $path === false ) {
 853                         $path = $dir;
 854                 }
 855                 $this->suffixStart = strlen( $path ) + 1; // size of "path/to/dir/"
 856                 $this->params = $params;
 857
 858                 try {
 859                         $this->iter = $this->initIterator( $path );
 860                 } catch ( UnexpectedValueException $e ) {
 861                         $this->iter = null; // bad permissions? deleted?
 862                 }
 863         }
 864
 865         /**
 866          * Return an appropriate iterator object to wrap
 867          *
 868          * @param string $dir file system directory
 869          * @return Iterator
 870          */
 871         protected function initIterator( $dir ) {
 872                 if ( !empty( $this->params['topOnly'] ) ) { // non-recursive
 873                         # Get an iterator that will get direct sub-nodes
 874                         return new DirectoryIterator( $dir );
 875                 } else { // recursive
 876                         # Get an iterator that will return leaf nodes (non-directories)
 877                         # RecursiveDirectoryIterator extends FilesystemIterator.
 878                         # FilesystemIterator::SKIP_DOTS default is inconsistent in PHP 5.3.x.
 879                         $flags = FilesystemIterator::CURRENT_AS_SELF | FilesystemIterator::SKIP_DOTS;
 880
 881                         return new RecursiveIteratorIterator(
 882                                 new RecursiveDirectoryIterator( $dir, $flags ),
 883                                 RecursiveIteratorIterator::CHILD_FIRST // include dirs
 884                         );
 885                 }
 886         }
 887
 888         /**
 889          * @see Iterator::key()
 890          * @return int
 891          */
 892         public function key() {
 893                 return $this->pos;
 894         }
 895
 896         /**
 897          * @see Iterator::current()
 898          * @return string|bool String or false
 899          */
 900         public function current() {
 901                 return $this->getRelPath( $this->iter->current()->getPathname() );
 902         }
 903
 904         /**
 905          * @see Iterator::next()
 906          * @throws FileBackendError
 907          */
 908         public function next() {
 909                 try {
 910                         $this->iter->next();
 911                         $this->filterViaNext();
 912                 } catch ( UnexpectedValueException $e ) { // bad permissions? deleted?
 913                         throw new FileBackendError( "File iterator gave UnexpectedValueException." );
 914                 }
 915                 ++$this->pos;
 916         }
 917
 918         /**
 919          * @see Iterator::rewind()
 920          * @throws FileBackendError
 921          */
 922         public function rewind() {
 923                 $this->pos = 0;
 924                 try {
 925                         $this->iter->rewind();
 926                         $this->filterViaNext();
 927                 } catch ( UnexpectedValueException $e ) { // bad permissions? deleted?
 928                         throw new FileBackendError( "File iterator gave UnexpectedValueException." );
 929                 }
 930         }
 931
 932         /**
 933          * @see Iterator::valid()
 934          * @return bool
 935          */
 936         public function valid() {
 937                 return $this->iter && $this->iter->valid();
 938         }
 939
 940         /**
 941          * Filter out items by advancing to the next ones
 942          */
 943         protected function filterViaNext() {
 944         }
 945
 946         /**
 947          * Return only the relative path and normalize slashes to FileBackend-style.
 948          * Uses the "real path" since the suffix is based upon that.
 949          *
 950          * @param string $dir
 951          * @return string
 952          */
 953         protected function getRelPath( $dir ) {
 954                 $path = realpath( $dir );
 955                 if ( $path === false ) {
 956                         $path = $dir;
 957                 }
 958
 959                 return strtr( substr( $path, $this->suffixStart ), '\\', '/' );
 960         }
 961 }
 962
 963 class FSFileBackendDirList extends FSFileBackendList {
 964         protected function filterViaNext() {
 965                 while ( $this->iter->valid() ) {
 966                         if ( $this->iter->current()->isDot() || !$this->iter->current()->isDir() ) {
 967                                 $this->iter->next(); // skip non-directories and dot files
 968                         } else {
 969                                 break;
 970                         }
 971                 }
 972         }
 973 }
 974
 975 class FSFileBackendFileList extends FSFileBackendList {
 976         protected function filterViaNext() {
 977                 while ( $this->iter->valid() ) {
 978                         if ( !$this->iter->current()->isFile() ) {
 979                                 $this->iter->next(); // skip non-files and dot files
 980                         } else {
 981                                 break;
 982                         }
 983                 }
 984         }
 985 }