FSFileBackend.php

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<?php
use Wikimedia\AtEase\AtEase;
use Wikimedia\Timestamp\ConvertibleTimestamp;
 
class FSFileBackend extends FileBackendStore {
    protected $basePath;
 
    protected $containerPaths;
 
    protected $dirMode;
    protected $fileMode;
    protected $fileOwner;
 
    protected $isWindows;
    protected $currentUser;
 
    private $warningTrapStack = [];
 
    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
        }
 
        $this->containerPaths = [];
        foreach ( ( $config['containerPaths'] ?? [] ) as $container => $path ) {
            $this->containerPaths[$container] = rtrim( $path, '/' ); // remove trailing slash
        }
 
        $this->fileMode = $config['fileMode'] ?? 0644;
        $this->dirMode = $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() {
        if ( $this->isWindows && version_compare( PHP_VERSION, '7.1', 'lt' ) ) {
            // PHP before 7.1 used 8-bit code page for filesystem paths on Windows;
            // See https://www.php.net/manual/en/migration71.windows-support.php
            return 0;
        } else {
            return self::ATTR_UNICODE_PATHS;
        }
    }
 
    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; // invalid
    }
 
    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;
        }
    }
 
    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
    }
 
    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 = $this->stageContentAsTempFile( $params );
            if ( !$tempFile ) {
                $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();
 
        $fsSrcPath = $this->resolveToFSPath( $params['src'] );
        if ( $fsSrcPath === null ) {
            $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 
            return $status;
        }
 
        $fsDstPath = $this->resolveToFSPath( $params['dst'] );
        if ( $fsDstPath === null ) {
            $status->fatal( 'backend-fail-invalidpath', $params['dst'] );
 
            return $status;
        }
 
        if ( $fsSrcPath === $fsDstPath ) {
            return $status; // no-op
        }
 
        $ignoreMissing = !empty( $params['ignoreMissingSource'] );
 
        if ( !empty( $params['async'] ) ) { // deferred
            // https://manpages.debian.org/buster/coreutils/mv.1.en.html
            // https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/move
            $encSrc = escapeshellarg( $this->cleanPathSlashes( $fsSrcPath ) );
            $encDst = escapeshellarg( $this->cleanPathSlashes( $fsDstPath ) );
            if ( $this->isWindows ) {
                $writeCmd = "MOVE /Y $encSrc $encDst";
                $cmd = $ignoreMissing ? "IF EXIST $encSrc $writeCmd" : $writeCmd;
            } else {
                $writeCmd = "mv -f $encSrc $encDst";
                $cmd = $ignoreMissing ? "test -f $encSrc && $writeCmd" : $writeCmd;
            }
            $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
            // Use rename() here since (a) this clears xattrs, (b) any threads still reading the
            // old inode are unaffected since it writes to a new inode, and (c) this is fast and
            // atomic within a file system volume (as is normally the case)
            $this->trapWarnings( '/: No such file or directory$/' );
            $moved = rename( $fsSrcPath, $fsDstPath );
            $hadError = $this->untrapWarnings();
            if ( $hadError || ( !$moved && !$ignoreMissing ) ) {
                $status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
 
                return $status;
            }
        }
 
        return $status;
    }
 
    protected function doDeleteInternal( array $params ) {
        $status = $this->newStatus();
 
        $fsSrcPath = $this->resolveToFSPath( $params['src'] );
        if ( $fsSrcPath === null ) {
            $status->fatal( 'backend-fail-invalidpath', $params['src'] );
 
            return $status;
        }
 
        $ignoreMissing = !empty( $params['ignoreMissingSource'] );
 
        if ( !empty( $params['async'] ) ) { // deferred
            // https://manpages.debian.org/buster/coreutils/rm.1.en.html
            // https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/del
            $encSrc = escapeshellarg( $this->cleanPathSlashes( $fsSrcPath ) );
            if ( $this->isWindows ) {
                $writeCmd = "DEL /Q $encSrc";
                $cmd = $ignoreMissing ? "IF EXIST $encSrc $writeCmd" : $writeCmd;
            } else {
                $cmd = $ignoreMissing ? "rm -f $encSrc" : "rm $encSrc";
            }
            $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
            $this->trapWarnings( '/: No such file or directory$/' );
            $deleted = unlink( $fsSrcPath );
            $hadError = $this->untrapWarnings();
            if ( $hadError || ( !$deleted && !$ignoreMissing ) ) {
                $status->fatal( 'backend-fail-delete', $params['src'] );
 
                return $status;
            }
        }
 
        return $status;
    }
 
    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( $dir ); // already there?
        // Create the directory and its parents as needed...
        AtEase::suppressWarnings();
        if ( !$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'] );
        }
        AtEase::restoreWarnings();
        // 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" ) ) {
            AtEase::suppressWarnings();
            $bytes = file_put_contents( "{$contRoot}/.htaccess", $this->htaccessPrivate() );
            AtEase::restoreWarnings();
            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() );
            if ( $exists && !$this->unlink( "{$dir}/index.html" ) ) { // reverse secure()
                $status->fatal( 'backend-fail-delete', $params['dir'] . '/index.html' );
            }
        }
        // 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() );
            if ( $exists && !$this->unlink( "{$contRoot}/.htaccess" ) ) { // reverse secure()
                $storeDir = "mwstore://{$this->name}/{$shortCont}";
                $status->fatal( 'backend-fail-delete', "{$storeDir}/.htaccess" );
            }
        }
 
        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;
        AtEase::suppressWarnings();
        rmdir( $dir ); // remove directory if empty
        AtEase::restoreWarnings();
 
        return $status;
    }
 
    protected function doGetFileStat( array $params ) {
        $source = $this->resolveToFSPath( $params['src'] );
        if ( $source === null ) {
            return self::$RES_ERROR; // 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 ( is_array( $stat ) ) {
            $ct = new ConvertibleTimestamp( $stat['mtime'] );
 
            return [
                'mtime' => $ct->getTimestamp( TS_MW ),
                'size' => $stat['size']
            ];
        }
 
        return $hadError ? self::$RES_ERROR : self::$RES_ABSENT;
    }
 
    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 $hadError ? self::$RES_ERROR : $exists;
    }
 
    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;
 
        $this->trapWarnings(); // don't trust 'false' if there were errors
        $exists = is_dir( $dir );
        $isReadable = $exists ? is_readable( $dir ) : false;
        $hadError = $this->untrapWarnings();
 
        if ( $isReadable ) {
            return new FSFileBackendDirList( $dir, $params );
        } elseif ( $exists ) {
            $this->logger->warning( __METHOD__ . ": given directory is unreadable: '$dir'" );
 
            return self::$RES_ERROR; // bad permissions?
        } elseif ( $hadError ) {
            $this->logger->warning( __METHOD__ . ": given directory was unreachable: '$dir'" );
 
            return self::$RES_ERROR;
        } else {
            $this->logger->info( __METHOD__ . ": given directory does not exist: '$dir'" );
 
            return []; // nothing under this dir
        }
    }
 
    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;
 
        $this->trapWarnings(); // don't trust 'false' if there were errors
        $exists = is_dir( $dir );
        $isReadable = $exists ? is_readable( $dir ) : false;
        $hadError = $this->untrapWarnings();
 
        if ( $exists && $isReadable ) {
            return new FSFileBackendFileList( $dir, $params );
        } elseif ( $exists ) {
            $this->logger->warning( __METHOD__ . ": given directory is unreadable: '$dir'\n" );
 
            return self::$RES_ERROR; // bad permissions?
        } elseif ( $hadError ) {
            $this->logger->warning( __METHOD__ . ": given directory was unreachable: '$dir'\n" );
 
            return self::$RES_ERROR;
        } else {
            $this->logger->info( __METHOD__ . ": given directory does not exist: '$dir'\n" );
 
            return []; // nothing under this dir
        }
    }
 
    protected function doGetLocalReferenceMulti( array $params ) {
        $fsFiles = []; // (path => FSFile)
 
        foreach ( $params['srcs'] as $src ) {
            $source = $this->resolveToFSPath( $src );
            if ( $source === null ) {
                $fsFiles[$src] = self::$RES_ERROR; // invalid path
                continue;
            }
 
            $this->trapWarnings(); // don't trust 'false' if there were errors
            $isFile = is_file( $source ); // regular files only
            $hadError = $this->untrapWarnings();
 
            if ( $isFile ) {
                $fsFiles[$src] = new FSFile( $source );
            } elseif ( $hadError ) {
                $fsFiles[$src] = self::$RES_ERROR;
            } else {
                $fsFiles[$src] = self::$RES_ABSENT;
            }
        }
 
        return $fsFiles;
    }
 
    protected function doGetLocalCopyMulti( array $params ) {
        $tmpFiles = []; // (path => TempFSFile)
 
        foreach ( $params['srcs'] as $src ) {
            $source = $this->resolveToFSPath( $src );
            if ( $source === null ) {
                $tmpFiles[$src] = self::$RES_ERROR; // invalid path
                continue;
            }
            // Create a new temporary file with the same extension...
            $ext = FileBackend::extensionFromPath( $src );
            $tmpFile = $this->tmpFileFactory->newTempFSFile( 'localcopy_', $ext );
            if ( !$tmpFile ) {
                $tmpFiles[$src] = self::$RES_ERROR;
                continue;
            }
 
            $tmpPath = $tmpFile->getPath();
            // Copy the source file over the temp file
            $this->trapWarnings(); // don't trust 'false' if there were errors
            $isFile = is_file( $source ); // regular files only
            $copySuccess = $isFile ? copy( $source, $tmpPath ) : false;
            $hadError = $this->untrapWarnings();
 
            if ( $copySuccess ) {
                $this->chmod( $tmpPath );
                $tmpFiles[$src] = $tmpFile;
            } elseif ( $hadError ) {
                $tmpFiles[$src] = self::$RES_ERROR; // copy failed
            } else {
                $tmpFiles[$src] = self::$RES_ABSENT;
            }
        }
 
        return $tmpFiles;
    }
 
    protected function directoriesAreVirtual() {
        return false;
    }
 
    protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
        $statuses = [];
 
        $pipes = [];
        $octalPermissions = '0' . decoct( $this->fileMode );
        foreach ( $fileOpHandles as $index => $fileOpHandle ) {
            $cmd = "{$fileOpHandle->cmd} 2>&1";
            // Add a post-operation chmod command for permissions cleanup if applicable
            if (
                !$this->isWindows &&
                $fileOpHandle->chmodPath !== null &&
                strlen( $octalPermissions ) == 4
            ) {
                $encPath = escapeshellarg( $fileOpHandle->chmodPath );
                $cmd .= " && chmod $octalPermissions $encPath 2>/dev/null";
            }
            $pipes[$index] = popen( $cmd, '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;
        }
 
        clearstatcache(); // files changed
 
        return $statuses;
    }
 
    protected function chmod( $path ) {
        if ( $this->isWindows ) {
            return true;
        }
 
        AtEase::suppressWarnings();
        $ok = chmod( $path, $this->fileMode );
        AtEase::restoreWarnings();
 
        return $ok;
    }
 
    protected function unlink( $path ) {
        AtEase::suppressWarnings();
        $ok = unlink( $path );
        AtEase::restoreWarnings();
 
        return $ok;
    }
 
    protected function stageContentAsTempFile( array $params ) {
        $content = $params['content'];
        $tempFile = $this->tmpFileFactory->newTempFSFile( 'create_', 'tmp' );
        if ( !$tempFile ) {
            return null;
        }
 
        AtEase::suppressWarnings();
        $tmpPath = $tempFile->getPath();
        if ( file_put_contents( $tmpPath, $content ) === false ) {
            $tempFile = null;
        }
        AtEase::restoreWarnings();
 
        return $tempFile;
    }
 
    protected function indexHtmlPrivate() {
        return '';
    }
 
    protected function htaccessPrivate() {
        return "Deny from all\n";
    }
 
    protected function cleanPathSlashes( $path ) {
        return $this->isWindows ? strtr( $path, '/', '\\' ) : $path;
    }
 
    protected function trapWarnings( $regexIgnore = null ) {
        $this->warningTrapStack[] = false;
        set_error_handler( function ( $errno, $errstr ) use ( $regexIgnore ) {
            if ( $regexIgnore === null || !preg_match( $regexIgnore, $errstr ) ) {
                $this->logger->error( $errstr );
                $this->warningTrapStack[count( $this->warningTrapStack ) - 1] = true;
            }
            return true; // suppress from PHP handler
        }, E_WARNING );
    }
 
    protected function untrapWarnings() {
        restore_error_handler();
 
        return array_pop( $this->warningTrapStack );
    }
}