Move FSFilebackend and MemoryFileBackend to /libs

Change-Id: Id38a2ef9e0e22537d0267b536f8a4dfd60c5b41d

1 files changed, 0 insertions, 984 deletions

diff --git a/includes/filebackend/FSFileBackend.php b/includes/filebackend/FSFileBackend.php
deleted file mode 100644
index ed1b4c00d35d..000000000000
--- a/includes/filebackend/FSFileBackend.php
+++ /dev/null
@@ -1,984 +0,0 @@
-<?php
-/**
- * File system based backend.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- * http://www.gnu.org/copyleft/gpl.html
- *
- * @file
- * @ingroup FileBackend
- * @author Aaron Schulz
- */
-
-/**
- * @brief Class for a file system (FS) based file backend.
- *
- * All "containers" each map to a directory under the backend's base directory.
- * For backwards-compatibility, some container paths can be set to custom paths.
- * The wiki ID will not be used in any custom paths, so this should be avoided.
- *
- * Having directories with thousands of files will diminish performance.
- * Sharding can be accomplished by using FileRepo-style hash paths.
- *
- * StatusValue messages should avoid mentioning the internal FS paths.
- * PHP warnings are assumed to be logged rather than output.
- *
- * @ingroup FileBackend
- * @since 1.19
- */
-class FSFileBackend extends FileBackendStore {
-	/** @var string Directory holding the container directories */
-	protected $basePath;
-
-	/** @var array Map of container names to root paths for custom container paths */
-	protected $containerPaths = [];
-
-	/** @var int File permission mode */
-	protected $fileMode;
-	/** @var int File permission mode */
-	protected $dirMode;
-
-	/** @var string Required OS username to own files */
-	protected $fileOwner;
-
-	/** @var bool */
-	protected $isWindows;
-	/** @var string OS username running this script */
-	protected $currentUser;
-
-	/** @var array */
-	protected $hadWarningErrors = [];
-
-	/**
-	 * @see FileBackendStore::__construct()
-	 * Additional $config params include:
-	 *   - basePath       : File system directory that holds containers.
-	 *   - containerPaths : Map of container names to custom file system directories.
-	 *                      This should only be used for backwards-compatibility.
-	 *   - fileMode       : Octal UNIX file permissions to use on files stored.
-	 *   - directoryMode  : Octal UNIX file permissions to use on directories created.
-	 * @param array $config
-	 */
-	public function __construct( array $config ) {
-		parent::__construct( $config );
-
-		$this->isWindows = ( strtoupper( substr( PHP_OS, 0, 3 ) ) === 'WIN' );
-		// Remove any possible trailing slash from directories
-		if ( isset( $config['basePath'] ) ) {
-			$this->basePath = rtrim( $config['basePath'], '/' ); // remove trailing slash
-		} else {
-			$this->basePath = null; // none; containers must have explicit paths
-		}
-
-		if ( isset( $config['containerPaths'] ) ) {
-			$this->containerPaths = (array)$config['containerPaths'];
-			foreach ( $this->containerPaths as &$path ) {
-				$path = rtrim( $path, '/' ); // remove trailing slash
-			}
-		}
-
-		$this->fileMode = isset( $config['fileMode'] ) ? $config['fileMode'] : 0644;
-		$this->dirMode = isset( $config['directoryMode'] ) ? $config['directoryMode'] : 0777;
-		if ( isset( $config['fileOwner'] ) && function_exists( 'posix_getuid' ) ) {
-			$this->fileOwner = $config['fileOwner'];
-			// cache this, assuming it doesn't change
-			$this->currentUser = posix_getpwuid( posix_getuid() )['name'];
-		}
-	}
-
-	public function getFeatures() {
-		return !$this->isWindows ? FileBackend::ATTR_UNICODE_PATHS : 0;
-	}
-
-	protected function resolveContainerPath( $container, $relStoragePath ) {
-		// Check that container has a root directory
-		if ( isset( $this->containerPaths[$container] ) || isset( $this->basePath ) ) {
-			// Check for sane relative paths (assume the base paths are OK)
-			if ( $this->isLegalRelPath( $relStoragePath ) ) {
-				return $relStoragePath;
-			}
-		}
-
-		return null;
-	}
-
-	/**
-	 * Sanity check a relative file system path for validity
-	 *
-	 * @param string $path Normalized relative path
-	 * @return bool
-	 */
-	protected function isLegalRelPath( $path ) {
-		// Check for file names longer than 255 chars
-		if ( preg_match( '![^/]{256}!', $path ) ) { // ext3/NTFS
-			return false;
-		}
-		if ( $this->isWindows ) { // NTFS
-			return !preg_match( '![:*?"<>|]!', $path );
-		} else {
-			return true;
-		}
-	}
-
-	/**
-	 * Given the short (unresolved) and full (resolved) name of
-	 * a container, return the file system path of the container.
-	 *
-	 * @param string $shortCont
-	 * @param string $fullCont
-	 * @return string|null
-	 */
-	protected function containerFSRoot( $shortCont, $fullCont ) {
-		if ( isset( $this->containerPaths[$shortCont] ) ) {
-			return $this->containerPaths[$shortCont];
-		} elseif ( isset( $this->basePath ) ) {
-			return "{$this->basePath}/{$fullCont}";
-		}
-
-		return null; // no container base path defined
-	}
-
-	/**
-	 * Get the absolute file system path for a storage path
-	 *
-	 * @param string $storagePath Storage path
-	 * @return string|null
-	 */
-	protected function resolveToFSPath( $storagePath ) {
-		list( $fullCont, $relPath ) = $this->resolveStoragePathReal( $storagePath );
-		if ( $relPath === null ) {
-			return null; // invalid
-		}
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $storagePath );
-		$fsPath = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		if ( $relPath != '' ) {
-			$fsPath .= "/{$relPath}";
-		}
-
-		return $fsPath;
-	}
-
-	public function isPathUsableInternal( $storagePath ) {
-		$fsPath = $this->resolveToFSPath( $storagePath );
-		if ( $fsPath === null ) {
-			return false; // invalid
-		}
-		$parentDir = dirname( $fsPath );
-
-		if ( file_exists( $fsPath ) ) {
-			$ok = is_file( $fsPath ) && is_writable( $fsPath );
-		} else {
-			$ok = is_dir( $parentDir ) && is_writable( $parentDir );
-		}
-
-		if ( $this->fileOwner !== null && $this->currentUser !== $this->fileOwner ) {
-			$ok = false;
-			trigger_error( __METHOD__ . ": PHP process owner is not '{$this->fileOwner}'." );
-		}
-
-		return $ok;
-	}
-
-	protected function doCreateInternal( array $params ) {
-		$status = $this->newStatus();
-
-		$dest = $this->resolveToFSPath( $params['dst'] );
-		if ( $dest === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		if ( !empty( $params['async'] ) ) { // deferred
-			$tempFile = TempFSFile::factory( 'create_', 'tmp', $this->tmpDirectory );
-			if ( !$tempFile ) {
-				$status->fatal( 'backend-fail-create', $params['dst'] );
-
-				return $status;
-			}
-			$this->trapWarnings();
-			$bytes = file_put_contents( $tempFile->getPath(), $params['content'] );
-			$this->untrapWarnings();
-			if ( $bytes === false ) {
-				$status->fatal( 'backend-fail-create', $params['dst'] );
-
-				return $status;
-			}
-			$cmd = implode( ' ', [
-				$this->isWindows ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
-				escapeshellarg( $this->cleanPathSlashes( $tempFile->getPath() ) ),
-				escapeshellarg( $this->cleanPathSlashes( $dest ) )
-			] );
-			$handler = function ( $errors, StatusValue $status, array $params, $cmd ) {
-				if ( $errors !== '' && !( $this->isWindows && $errors[0] === " " ) ) {
-					$status->fatal( 'backend-fail-create', $params['dst'] );
-					trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
-				}
-			};
-			$status->value = new FSFileOpHandle( $this, $params, $handler, $cmd, $dest );
-			$tempFile->bind( $status->value );
-		} else { // immediate write
-			$this->trapWarnings();
-			$bytes = file_put_contents( $dest, $params['content'] );
-			$this->untrapWarnings();
-			if ( $bytes === false ) {
-				$status->fatal( 'backend-fail-create', $params['dst'] );
-
-				return $status;
-			}
-			$this->chmod( $dest );
-		}
-
-		return $status;
-	}
-
-	protected function doStoreInternal( array $params ) {
-		$status = $this->newStatus();
-
-		$dest = $this->resolveToFSPath( $params['dst'] );
-		if ( $dest === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		if ( !empty( $params['async'] ) ) { // deferred
-			$cmd = implode( ' ', [
-				$this->isWindows ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
-				escapeshellarg( $this->cleanPathSlashes( $params['src'] ) ),
-				escapeshellarg( $this->cleanPathSlashes( $dest ) )
-			] );
-			$handler = function ( $errors, StatusValue $status, array $params, $cmd ) {
-				if ( $errors !== '' && !( $this->isWindows && $errors[0] === " " ) ) {
-					$status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
-					trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
-				}
-			};
-			$status->value = new FSFileOpHandle( $this, $params, $handler, $cmd, $dest );
-		} else { // immediate write
-			$this->trapWarnings();
-			$ok = copy( $params['src'], $dest );
-			$this->untrapWarnings();
-			// In some cases (at least over NFS), copy() returns true when it fails
-			if ( !$ok || ( filesize( $params['src'] ) !== filesize( $dest ) ) ) {
-				if ( $ok ) { // PHP bug
-					unlink( $dest ); // remove broken file
-					trigger_error( __METHOD__ . ": copy() failed but returned true." );
-				}
-				$status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
-
-				return $status;
-			}
-			$this->chmod( $dest );
-		}
-
-		return $status;
-	}
-
-	protected function doCopyInternal( array $params ) {
-		$status = $this->newStatus();
-
-		$source = $this->resolveToFSPath( $params['src'] );
-		if ( $source === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		$dest = $this->resolveToFSPath( $params['dst'] );
-		if ( $dest === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		if ( !is_file( $source ) ) {
-			if ( empty( $params['ignoreMissingSource'] ) ) {
-				$status->fatal( 'backend-fail-copy', $params['src'] );
-			}
-
-			return $status; // do nothing; either OK or bad status
-		}
-
-		if ( !empty( $params['async'] ) ) { // deferred
-			$cmd = implode( ' ', [
-				$this->isWindows ? 'COPY /B /Y' : 'cp', // (binary, overwrite)
-				escapeshellarg( $this->cleanPathSlashes( $source ) ),
-				escapeshellarg( $this->cleanPathSlashes( $dest ) )
-			] );
-			$handler = function ( $errors, StatusValue $status, array $params, $cmd ) {
-				if ( $errors !== '' && !( $this->isWindows && $errors[0] === " " ) ) {
-					$status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
-					trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
-				}
-			};
-			$status->value = new FSFileOpHandle( $this, $params, $handler, $cmd, $dest );
-		} else { // immediate write
-			$this->trapWarnings();
-			$ok = ( $source === $dest ) ? true : copy( $source, $dest );
-			$this->untrapWarnings();
-			// In some cases (at least over NFS), copy() returns true when it fails
-			if ( !$ok || ( filesize( $source ) !== filesize( $dest ) ) ) {
-				if ( $ok ) { // PHP bug
-					$this->trapWarnings();
-					unlink( $dest ); // remove broken file
-					$this->untrapWarnings();
-					trigger_error( __METHOD__ . ": copy() failed but returned true." );
-				}
-				$status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
-
-				return $status;
-			}
-			$this->chmod( $dest );
-		}
-
-		return $status;
-	}
-
-	protected function doMoveInternal( array $params ) {
-		$status = $this->newStatus();
-
-		$source = $this->resolveToFSPath( $params['src'] );
-		if ( $source === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		$dest = $this->resolveToFSPath( $params['dst'] );
-		if ( $dest === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		if ( !is_file( $source ) ) {
-			if ( empty( $params['ignoreMissingSource'] ) ) {
-				$status->fatal( 'backend-fail-move', $params['src'] );
-			}
-
-			return $status; // do nothing; either OK or bad status
-		}
-
-		if ( !empty( $params['async'] ) ) { // deferred
-			$cmd = implode( ' ', [
-				$this->isWindows ? 'MOVE /Y' : 'mv', // (overwrite)
-				escapeshellarg( $this->cleanPathSlashes( $source ) ),
-				escapeshellarg( $this->cleanPathSlashes( $dest ) )
-			] );
-			$handler = function ( $errors, StatusValue $status, array $params, $cmd ) {
-				if ( $errors !== '' && !( $this->isWindows && $errors[0] === " " ) ) {
-					$status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
-					trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
-				}
-			};
-			$status->value = new FSFileOpHandle( $this, $params, $handler, $cmd );
-		} else { // immediate write
-			$this->trapWarnings();
-			$ok = ( $source === $dest ) ? true : rename( $source, $dest );
-			$this->untrapWarnings();
-			clearstatcache(); // file no longer at source
-			if ( !$ok ) {
-				$status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
-
-				return $status;
-			}
-		}
-
-		return $status;
-	}
-
-	protected function doDeleteInternal( array $params ) {
-		$status = $this->newStatus();
-
-		$source = $this->resolveToFSPath( $params['src'] );
-		if ( $source === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		if ( !is_file( $source ) ) {
-			if ( empty( $params['ignoreMissingSource'] ) ) {
-				$status->fatal( 'backend-fail-delete', $params['src'] );
-			}
-
-			return $status; // do nothing; either OK or bad status
-		}
-
-		if ( !empty( $params['async'] ) ) { // deferred
-			$cmd = implode( ' ', [
-				$this->isWindows ? 'DEL' : 'unlink',
-				escapeshellarg( $this->cleanPathSlashes( $source ) )
-			] );
-			$handler = function ( $errors, StatusValue $status, array $params, $cmd ) {
-				if ( $errors !== '' && !( $this->isWindows && $errors[0] === " " ) ) {
-					$status->fatal( 'backend-fail-delete', $params['src'] );
-					trigger_error( "$cmd\n$errors", E_USER_WARNING ); // command output
-				}
-			};
-			$status->value = new FSFileOpHandle( $this, $params, $handler, $cmd );
-		} else { // immediate write
-			$this->trapWarnings();
-			$ok = unlink( $source );
-			$this->untrapWarnings();
-			if ( !$ok ) {
-				$status->fatal( 'backend-fail-delete', $params['src'] );
-
-				return $status;
-			}
-		}
-
-		return $status;
-	}
-
-	/**
-	 * @param string $fullCont
-	 * @param string $dirRel
-	 * @param array $params
-	 * @return StatusValue
-	 */
-	protected function doPrepareInternal( $fullCont, $dirRel, array $params ) {
-		$status = $this->newStatus();
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-		$existed = is_dir( $dir ); // already there?
-		// Create the directory and its parents as needed...
-		$this->trapWarnings();
-		if ( !$existed && !mkdir( $dir, $this->dirMode, true ) && !is_dir( $dir ) ) {
-			$this->logger->error( __METHOD__ . ": cannot create directory $dir" );
-			$status->fatal( 'directorycreateerror', $params['dir'] ); // fails on races
-		} elseif ( !is_writable( $dir ) ) {
-			$this->logger->error( __METHOD__ . ": directory $dir is read-only" );
-			$status->fatal( 'directoryreadonlyerror', $params['dir'] );
-		} elseif ( !is_readable( $dir ) ) {
-			$this->logger->error( __METHOD__ . ": directory $dir is not readable" );
-			$status->fatal( 'directorynotreadableerror', $params['dir'] );
-		}
-		$this->untrapWarnings();
-		// Respect any 'noAccess' or 'noListing' flags...
-		if ( is_dir( $dir ) && !$existed ) {
-			$status->merge( $this->doSecureInternal( $fullCont, $dirRel, $params ) );
-		}
-
-		return $status;
-	}
-
-	protected function doSecureInternal( $fullCont, $dirRel, array $params ) {
-		$status = $this->newStatus();
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-		// Seed new directories with a blank index.html, to prevent crawling...
-		if ( !empty( $params['noListing'] ) && !file_exists( "{$dir}/index.html" ) ) {
-			$this->trapWarnings();
-			$bytes = file_put_contents( "{$dir}/index.html", $this->indexHtmlPrivate() );
-			$this->untrapWarnings();
-			if ( $bytes === false ) {
-				$status->fatal( 'backend-fail-create', $params['dir'] . '/index.html' );
-			}
-		}
-		// Add a .htaccess file to the root of the container...
-		if ( !empty( $params['noAccess'] ) && !file_exists( "{$contRoot}/.htaccess" ) ) {
-			$this->trapWarnings();
-			$bytes = file_put_contents( "{$contRoot}/.htaccess", $this->htaccessPrivate() );
-			$this->untrapWarnings();
-			if ( $bytes === false ) {
-				$storeDir = "mwstore://{$this->name}/{$shortCont}";
-				$status->fatal( 'backend-fail-create', "{$storeDir}/.htaccess" );
-			}
-		}
-
-		return $status;
-	}
-
-	protected function doPublishInternal( $fullCont, $dirRel, array $params ) {
-		$status = $this->newStatus();
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-		// Unseed new directories with a blank index.html, to allow crawling...
-		if ( !empty( $params['listing'] ) && is_file( "{$dir}/index.html" ) ) {
-			$exists = ( file_get_contents( "{$dir}/index.html" ) === $this->indexHtmlPrivate() );
-			$this->trapWarnings();
-			if ( $exists && !unlink( "{$dir}/index.html" ) ) { // reverse secure()
-				$status->fatal( 'backend-fail-delete', $params['dir'] . '/index.html' );
-			}
-			$this->untrapWarnings();
-		}
-		// Remove the .htaccess file from the root of the container...
-		if ( !empty( $params['access'] ) && is_file( "{$contRoot}/.htaccess" ) ) {
-			$exists = ( file_get_contents( "{$contRoot}/.htaccess" ) === $this->htaccessPrivate() );
-			$this->trapWarnings();
-			if ( $exists && !unlink( "{$contRoot}/.htaccess" ) ) { // reverse secure()
-				$storeDir = "mwstore://{$this->name}/{$shortCont}";
-				$status->fatal( 'backend-fail-delete', "{$storeDir}/.htaccess" );
-			}
-			$this->untrapWarnings();
-		}
-
-		return $status;
-	}
-
-	protected function doCleanInternal( $fullCont, $dirRel, array $params ) {
-		$status = $this->newStatus();
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-		$this->trapWarnings();
-		if ( is_dir( $dir ) ) {
-			rmdir( $dir ); // remove directory if empty
-		}
-		$this->untrapWarnings();
-
-		return $status;
-	}
-
-	protected function doGetFileStat( array $params ) {
-		$source = $this->resolveToFSPath( $params['src'] );
-		if ( $source === null ) {
-			return false; // invalid storage path
-		}
-
-		$this->trapWarnings(); // don't trust 'false' if there were errors
-		$stat = is_file( $source ) ? stat( $source ) : false; // regular files only
-		$hadError = $this->untrapWarnings();
-
-		if ( $stat ) {
-			$ct = new ConvertibleTimestamp( $stat['mtime'] );
-
-			return [
-				'mtime' => $ct->getTimestamp( TS_MW ),
-				'size' => $stat['size']
-			];
-		} elseif ( !$hadError ) {
-			return false; // file does not exist
-		} else {
-			return null; // failure
-		}
-	}
-
-	protected function doClearCache( array $paths = null ) {
-		clearstatcache(); // clear the PHP file stat cache
-	}
-
-	protected function doDirectoryExists( $fullCont, $dirRel, array $params ) {
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-
-		$this->trapWarnings(); // don't trust 'false' if there were errors
-		$exists = is_dir( $dir );
-		$hadError = $this->untrapWarnings();
-
-		return $hadError ? null : $exists;
-	}
-
-	/**
-	 * @see FileBackendStore::getDirectoryListInternal()
-	 * @param string $fullCont
-	 * @param string $dirRel
-	 * @param array $params
-	 * @return array|null
-	 */
-	public function getDirectoryListInternal( $fullCont, $dirRel, array $params ) {
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-		$exists = is_dir( $dir );
-		if ( !$exists ) {
-			$this->logger->warning( __METHOD__ . "() given directory does not exist: '$dir'\n" );
-
-			return []; // nothing under this dir
-		} elseif ( !is_readable( $dir ) ) {
-			$this->logger->warning( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
-
-			return null; // bad permissions?
-		}
-
-		return new FSFileBackendDirList( $dir, $params );
-	}
-
-	/**
-	 * @see FileBackendStore::getFileListInternal()
-	 * @param string $fullCont
-	 * @param string $dirRel
-	 * @param array $params
-	 * @return array|FSFileBackendFileList|null
-	 */
-	public function getFileListInternal( $fullCont, $dirRel, array $params ) {
-		list( , $shortCont, ) = FileBackend::splitStoragePath( $params['dir'] );
-		$contRoot = $this->containerFSRoot( $shortCont, $fullCont ); // must be valid
-		$dir = ( $dirRel != '' ) ? "{$contRoot}/{$dirRel}" : $contRoot;
-		$exists = is_dir( $dir );
-		if ( !$exists ) {
-			$this->logger->warning( __METHOD__ . "() given directory does not exist: '$dir'\n" );
-
-			return []; // nothing under this dir
-		} elseif ( !is_readable( $dir ) ) {
-			$this->logger->warning( __METHOD__ . "() given directory is unreadable: '$dir'\n" );
-
-			return null; // bad permissions?
-		}
-
-		return new FSFileBackendFileList( $dir, $params );
-	}
-
-	protected function doGetLocalReferenceMulti( array $params ) {
-		$fsFiles = []; // (path => FSFile)
-
-		foreach ( $params['srcs'] as $src ) {
-			$source = $this->resolveToFSPath( $src );
-			if ( $source === null || !is_file( $source ) ) {
-				$fsFiles[$src] = null; // invalid path or file does not exist
-			} else {
-				$fsFiles[$src] = new FSFile( $source );
-			}
-		}
-
-		return $fsFiles;
-	}
-
-	protected function doGetLocalCopyMulti( array $params ) {
-		$tmpFiles = []; // (path => TempFSFile)
-
-		foreach ( $params['srcs'] as $src ) {
-			$source = $this->resolveToFSPath( $src );
-			if ( $source === null ) {
-				$tmpFiles[$src] = null; // invalid path
-			} else {
-				// Create a new temporary file with the same extension...
-				$ext = FileBackend::extensionFromPath( $src );
-				$tmpFile = TempFSFile::factory( 'localcopy_', $ext, $this->tmpDirectory );
-				if ( !$tmpFile ) {
-					$tmpFiles[$src] = null;
-				} else {
-					$tmpPath = $tmpFile->getPath();
-					// Copy the source file over the temp file
-					$this->trapWarnings();
-					$ok = copy( $source, $tmpPath );
-					$this->untrapWarnings();
-					if ( !$ok ) {
-						$tmpFiles[$src] = null;
-					} else {
-						$this->chmod( $tmpPath );
-						$tmpFiles[$src] = $tmpFile;
-					}
-				}
-			}
-		}
-
-		return $tmpFiles;
-	}
-
-	protected function directoriesAreVirtual() {
-		return false;
-	}
-
-	/**
-	 * @param FSFileOpHandle[] $fileOpHandles
-	 *
-	 * @return StatusValue[]
-	 */
-	protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
-		$statuses = [];
-
-		$pipes = [];
-		foreach ( $fileOpHandles as $index => $fileOpHandle ) {
-			$pipes[$index] = popen( "{$fileOpHandle->cmd} 2>&1", 'r' );
-		}
-
-		$errs = [];
-		foreach ( $pipes as $index => $pipe ) {
-			// Result will be empty on success in *NIX. On Windows,
-			// it may be something like "        1 file(s) [copied|moved].".
-			$errs[$index] = stream_get_contents( $pipe );
-			fclose( $pipe );
-		}
-
-		foreach ( $fileOpHandles as $index => $fileOpHandle ) {
-			$status = $this->newStatus();
-			$function = $fileOpHandle->call;
-			$function( $errs[$index], $status, $fileOpHandle->params, $fileOpHandle->cmd );
-			$statuses[$index] = $status;
-			if ( $status->isOK() && $fileOpHandle->chmodPath ) {
-				$this->chmod( $fileOpHandle->chmodPath );
-			}
-		}
-
-		clearstatcache(); // files changed
-		return $statuses;
-	}
-
-	/**
-	 * Chmod a file, suppressing the warnings
-	 *
-	 * @param string $path Absolute file system path
-	 * @return bool Success
-	 */
-	protected function chmod( $path ) {
-		$this->trapWarnings();
-		$ok = chmod( $path, $this->fileMode );
-		$this->untrapWarnings();
-
-		return $ok;
-	}
-
-	/**
-	 * Return the text of an index.html file to hide directory listings
-	 *
-	 * @return string
-	 */
-	protected function indexHtmlPrivate() {
-		return '';
-	}
-
-	/**
-	 * Return the text of a .htaccess file to make a directory private
-	 *
-	 * @return string
-	 */
-	protected function htaccessPrivate() {
-		return "Deny from all\n";
-	}
-
-	/**
-	 * Clean up directory separators for the given OS
-	 *
-	 * @param string $path FS path
-	 * @return string
-	 */
-	protected function cleanPathSlashes( $path ) {
-		return $this->isWindows ? strtr( $path, '/', '\\' ) : $path;
-	}
-
-	/**
-	 * Listen for E_WARNING errors and track whether any happen
-	 */
-	protected function trapWarnings() {
-		$this->hadWarningErrors[] = false; // push to stack
-		set_error_handler( [ $this, 'handleWarning' ], E_WARNING );
-	}
-
-	/**
-	 * Stop listening for E_WARNING errors and return true if any happened
-	 *
-	 * @return bool
-	 */
-	protected function untrapWarnings() {
-		restore_error_handler(); // restore previous handler
-		return array_pop( $this->hadWarningErrors ); // pop from stack
-	}
-
-	/**
-	 * @param int $errno
-	 * @param string $errstr
-	 * @return bool
-	 * @access private
-	 */
-	public function handleWarning( $errno, $errstr ) {
-		$this->logger->error( $errstr ); // more detailed error logging
-		$this->hadWarningErrors[count( $this->hadWarningErrors ) - 1] = true;
-
-		return true; // suppress from PHP handler
-	}
-}
-
-/**
- * @see FileBackendStoreOpHandle
- */
-class FSFileOpHandle extends FileBackendStoreOpHandle {
-	public $cmd; // string; shell command
-	public $chmodPath; // string; file to chmod
-
-	/**
-	 * @param FSFileBackend $backend
-	 * @param array $params
-	 * @param callable $call
-	 * @param string $cmd
-	 * @param int|null $chmodPath
-	 */
-	public function __construct(
-		FSFileBackend $backend, array $params, $call, $cmd, $chmodPath = null
-	) {
-		$this->backend = $backend;
-		$this->params = $params;
-		$this->call = $call;
-		$this->cmd = $cmd;
-		$this->chmodPath = $chmodPath;
-	}
-}
-
-/**
- * Wrapper around RecursiveDirectoryIterator/DirectoryIterator that
- * catches exception or does any custom behavoir that we may want.
- * Do not use this class from places outside FSFileBackend.
- *
- * @ingroup FileBackend
- */
-abstract class FSFileBackendList implements Iterator {
-	/** @var Iterator */
-	protected $iter;
-
-	/** @var int */
-	protected $suffixStart;
-
-	/** @var int */
-	protected $pos = 0;
-
-	/** @var array */
-	protected $params = [];
-
-	/**
-	 * @param string $dir File system directory
-	 * @param array $params
-	 */
-	public function __construct( $dir, array $params ) {
-		$path = realpath( $dir ); // normalize
-		if ( $path === false ) {
-			$path = $dir;
-		}
-		$this->suffixStart = strlen( $path ) + 1; // size of "path/to/dir/"
-		$this->params = $params;
-
-		try {
-			$this->iter = $this->initIterator( $path );
-		} catch ( UnexpectedValueException $e ) {
-			$this->iter = null; // bad permissions? deleted?
-		}
-	}
-
-	/**
-	 * Return an appropriate iterator object to wrap
-	 *
-	 * @param string $dir File system directory
-	 * @return Iterator
-	 */
-	protected function initIterator( $dir ) {
-		if ( !empty( $this->params['topOnly'] ) ) { // non-recursive
-			# Get an iterator that will get direct sub-nodes
-			return new DirectoryIterator( $dir );
-		} else { // recursive
-			# Get an iterator that will return leaf nodes (non-directories)
-			# RecursiveDirectoryIterator extends FilesystemIterator.
-			# FilesystemIterator::SKIP_DOTS default is inconsistent in PHP 5.3.x.
-			$flags = FilesystemIterator::CURRENT_AS_SELF | FilesystemIterator::SKIP_DOTS;
-
-			return new RecursiveIteratorIterator(
-				new RecursiveDirectoryIterator( $dir, $flags ),
-				RecursiveIteratorIterator::CHILD_FIRST // include dirs
-			);
-		}
-	}
-
-	/**
-	 * @see Iterator::key()
-	 * @return int
-	 */
-	public function key() {
-		return $this->pos;
-	}
-
-	/**
-	 * @see Iterator::current()
-	 * @return string|bool String or false
-	 */
-	public function current() {
-		return $this->getRelPath( $this->iter->current()->getPathname() );
-	}
-
-	/**
-	 * @see Iterator::next()
-	 * @throws FileBackendError
-	 */
-	public function next() {
-		try {
-			$this->iter->next();
-			$this->filterViaNext();
-		} catch ( UnexpectedValueException $e ) { // bad permissions? deleted?
-			throw new FileBackendError( "File iterator gave UnexpectedValueException." );
-		}
-		++$this->pos;
-	}
-
-	/**
-	 * @see Iterator::rewind()
-	 * @throws FileBackendError
-	 */
-	public function rewind() {
-		$this->pos = 0;
-		try {
-			$this->iter->rewind();
-			$this->filterViaNext();
-		} catch ( UnexpectedValueException $e ) { // bad permissions? deleted?
-			throw new FileBackendError( "File iterator gave UnexpectedValueException." );
-		}
-	}
-
-	/**
-	 * @see Iterator::valid()
-	 * @return bool
-	 */
-	public function valid() {
-		return $this->iter && $this->iter->valid();
-	}
-
-	/**
-	 * Filter out items by advancing to the next ones
-	 */
-	protected function filterViaNext() {
-	}
-
-	/**
-	 * Return only the relative path and normalize slashes to FileBackend-style.
-	 * Uses the "real path" since the suffix is based upon that.
-	 *
-	 * @param string $dir
-	 * @return string
-	 */
-	protected function getRelPath( $dir ) {
-		$path = realpath( $dir );
-		if ( $path === false ) {
-			$path = $dir;
-		}
-
-		return strtr( substr( $path, $this->suffixStart ), '\\', '/' );
-	}
-}
-
-class FSFileBackendDirList extends FSFileBackendList {
-	protected function filterViaNext() {
-		while ( $this->iter->valid() ) {
-			if ( $this->iter->current()->isDot() || !$this->iter->current()->isDir() ) {
-				$this->iter->next(); // skip non-directories and dot files
-			} else {
-				break;
-			}
-		}
-	}
-}
-
-class FSFileBackendFileList extends FSFileBackendList {
-	protected function filterViaNext() {
-		while ( $this->iter->valid() ) {
-			if ( !$this->iter->current()->isFile() ) {
-				$this->iter->next(); // skip non-files and dot files
-			} else {
-				break;
-			}
-		}
-	}
-}