// ************************************************************************** // * This file is part of the FreeFileSync project. It is distributed under * // * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 * // * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved * // ************************************************************************** #include "recycler.h" #include "file_access.h" #ifdef ZEN_WIN #include "thread.h" #ifdef ZEN_WIN_VISTA_AND_LATER #include "vista_file_op.h" #else #include "com_tools.h" #endif #elif defined ZEN_LINUX #include #include #include "scope_guard.h" #elif defined ZEN_MAC #include #endif using namespace zen; #ifdef ZEN_WIN void zen::recycleOrDelete(const std::vector& itempaths, const std::function& onRecycleItem) { if (itempaths.empty()) return; //warning: moving long file paths to recycler does not work! //both ::SHFileOperation() and ::IFileOperation cannot delete a folder named "System Volume Information" with normal attributes but shamelessly report success //both ::SHFileOperation() and ::IFileOperation can't handle \\?\-prefix! /* Performance test: delete 1000 files ------------------------------------ SHFileOperation - single file 33s SHFileOperation - multiple files 2,1s IFileOperation - single file 33s IFileOperation - multiple files 2,1s => SHFileOperation and IFileOperation have nearly IDENTICAL performance characteristics! Nevertheless, let's use IFileOperation for better error reporting (including details on locked files)! */ #ifdef ZEN_WIN_VISTA_AND_LATER vista::moveToRecycleBin(itempaths, onRecycleItem); //throw FileError #else //regular recycle bin usage: available since XP: 1. bad error reporting 2. early failure Zstring itempathsDoubleNull; for (const Zstring& itempath : itempaths) { itempathsDoubleNull += itempath; itempathsDoubleNull += L'\0'; } SHFILEOPSTRUCT fileOp = {}; fileOp.hwnd = nullptr; fileOp.wFunc = FO_DELETE; fileOp.pFrom = itempathsDoubleNull.c_str(); fileOp.pTo = nullptr; fileOp.fFlags = FOF_ALLOWUNDO | FOF_SILENT | FOF_NOCONFIRMATION | FOF_NOERRORUI; fileOp.fAnyOperationsAborted = false; fileOp.hNameMappings = nullptr; fileOp.lpszProgressTitle = nullptr; //"You should use fully-qualified path names with this function. Using it with relative path names is not thread safe." if (::SHFileOperation(&fileOp) != 0 || fileOp.fAnyOperationsAborted) { std::wstring itempathFmt = fmtPath(itempaths[0]); //probably not the correct file name for file lists larger than 1! if (itempaths.size() > 1) itempathFmt += L", ..."; //give at least some hint that there are multiple files, and the error need not be related to the first one throw FileError(replaceCpy(_("Unable to move %x to the recycle bin."), L"%x", itempathFmt)); } #endif } #endif bool zen::recycleOrDelete(const Zstring& itempath) //throw FileError { if (!somethingExists(itempath)) //[!] do not optimize away, OS X needs this for reliable detection of "recycle bin missing" return false; //neither file nor any other object with that name existing: no error situation, manual deletion relies on it! #ifdef ZEN_WIN recycleOrDelete({ itempath }, nullptr); //throw FileError #elif defined ZEN_LINUX GFile* file = ::g_file_new_for_path(itempath.c_str()); //never fails according to docu ZEN_ON_SCOPE_EXIT(g_object_unref(file);) GError* error = nullptr; ZEN_ON_SCOPE_EXIT(if (error) ::g_error_free(error);); if (!::g_file_trash(file, nullptr, &error)) { const std::wstring errorMsg = replaceCpy(_("Unable to move %x to the recycle bin."), L"%x", fmtPath(itempath)); if (!error) throw FileError(errorMsg, L"g_file_trash: unknown error."); //user should never see this //implement same behavior as in Windows: if recycler is not existing, delete permanently if (error->code == G_IO_ERROR_NOT_SUPPORTED) { struct ::stat fileInfo = {}; if (::lstat(itempath.c_str(), &fileInfo) != 0) return false; if (S_ISLNK(fileInfo.st_mode) || S_ISREG(fileInfo.st_mode)) removeFile(itempath); //throw FileError else if (S_ISDIR(fileInfo.st_mode)) removeDirectoryRecursively(itempath); //throw FileError return true; } throw FileError(errorMsg, replaceCpy(L"Glib Error Code %x:", L"%x", numberTo(error->code)) + L" " + utfCvrtTo(error->message)); //g_quark_to_string(error->domain) } #elif defined ZEN_MAC //we cannot use FSPathMoveObjectToTrashSync directly since it follows symlinks! static_assert(sizeof(Zchar) == sizeof(char), ""); const UInt8* itempathUtf8 = reinterpret_cast(itempath.c_str()); auto throwFileError = [&](OSStatus oss) { const std::wstring errorMsg = replaceCpy(_("Unable to move %x to the recycle bin."), L"%x", fmtPath(itempath)); std::wstring errorDescr = L"OSStatus Code " + numberTo(oss); if (const char* description = ::GetMacOSStatusCommentString(oss)) //found no documentation for proper use of GetMacOSStatusCommentString errorDescr += L": " + utfCvrtTo(description); throw FileError(errorMsg, errorDescr); }; FSRef objectRef = {}; //= POD structure not a pointer type! OSStatus rv = ::FSPathMakeRefWithOptions(itempathUtf8, //const UInt8 *path, kFSPathMakeRefDoNotFollowLeafSymlink, //OptionBits options, &objectRef, //FSRef *ref, nullptr); //Boolean *isDirectory if (rv != noErr) throwFileError(rv); //deprecated since OS X 10.8!!! "trashItemAtURL" should be used instead OSStatus rv2 = ::FSMoveObjectToTrashSync(&objectRef, //const FSRef *source, nullptr, //FSRef *target, kFSFileOperationDefaultOptions); //OptionBits options if (rv2 != noErr) { //implement same behavior as in Windows: if recycler is not existing, delete permanently if (rv2 == -120) //=="Directory not found or incomplete pathname." but should really be "recycle bin directory not found"! { struct ::stat fileInfo = {}; if (::lstat(itempath.c_str(), &fileInfo) != 0) return false; if (S_ISLNK(fileInfo.st_mode) || S_ISREG(fileInfo.st_mode)) removeFile(itempath); //throw FileError else if (S_ISDIR(fileInfo.st_mode)) removeDirectoryRecursively(itempath); //throw FileError return true; } throwFileError(rv2); } #endif return true; } #ifdef ZEN_WIN bool zen::recycleBinExists(const Zstring& dirPath, const std::function& onUpdateGui) //throw FileError { #ifdef ZEN_WIN_VISTA_AND_LATER return vista::supportsRecycleBin(dirPath); //throw FileError #else //excessive runtime if recycle bin exists, is full and drive is slow: auto ft = runAsync([dirPath]() -> HRESULT { try { ComInitializer ci; //throw SysError SHQUERYRBINFO recInfo = {}; recInfo.cbSize = sizeof(recInfo); return ::SHQueryRecycleBin(dirPath.c_str(), //__in_opt LPCTSTR pszRootPath, &recInfo); //__inout LPSHQUERYRBINFO pSHQueryRBInfo } catch (SysError&) { assert(false); return ERROR_GEN_FAILURE; } }); while (ft.wait_for(std::chrono::milliseconds(50)) != std::future_status::ready) if (onUpdateGui) onUpdateGui(); //may throw! return ft.get() == S_OK; #endif //1. ::SHQueryRecycleBin() is excessive: traverses whole $Recycle.Bin directory tree each time!!!! But it's safe and correct. //2. we can't simply buffer the ::SHQueryRecycleBin() based on volume serial number: // "subst S:\ C:\" => GetVolumeInformation() returns same serial for C:\ and S:\, but S:\ does not support recycle bin! //3. we would prefer to use CLSID_RecycleBinManager beginning with Vista... if only this interface were documented!!! //4. check directory existence of "C:\$Recycle.Bin, C:\RECYCLER, C:\RECYCLED" // -> not upward-compatible, wrong result for subst-alias: recycler assumed existing, although it is not! //5. alternative approach a'la Raymond Chen: https://blogs.msdn.microsoft.com/oldnewthing/20080918-00/?p=20843/ //caveat: might not be reliable, e.g. "subst"-alias of volume contains "$Recycle.Bin" although recycler is not available! /* Zstring rootPathPf = appendSeparator(&buffer[0]); const bool canUseFastCheckForRecycler = winXpOrLater(); if (!canUseFastCheckForRecycler) //== "checkForRecycleBin" return STATUS_REC_UNKNOWN; using namespace fileop; const DllFun checkRecycler(getDllName(), funName_checkRecycler); if (!checkRecycler) return STATUS_REC_UNKNOWN; //actually an error since we're >= XP //search root directories for recycle bin folder... WIN32_FIND_DATA dataRoot = {}; HANDLE hFindRoot = ::FindFirstFile(applyLongPathPrefix(rootPathPf + L'*').c_str(), &dataRoot); if (hFindRoot == INVALID_HANDLE_VALUE) return STATUS_REC_UNKNOWN; ZEN_ON_SCOPE_EXIT(FindClose(hFindRoot)); auto shouldSkip = [](const Zstring& shortname) { return shortname == L"." || shortname == L".."; }; do { if (!shouldSkip(dataRoot.cFileName) && (dataRoot.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0 && (dataRoot.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM ) != 0 && //risky to rely on these attributes!!! (dataRoot.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN ) != 0) // { WIN32_FIND_DATA dataChild = {}; const Zstring childDirPf = rootPathPf + dataRoot.cFileName + L"\\"; HANDLE hFindChild = ::FindFirstFile(applyLongPathPrefix(childDirPf + L'*').c_str(), &dataChild); if (hFindChild != INVALID_HANDLE_VALUE) //if we can't access a subdir, it's probably not the recycler { ZEN_ON_SCOPE_EXIT(FindClose(hFindChild)); do { if (!shouldSkip(dataChild.cFileName) && (dataChild.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) { bool isRecycler = false; if (checkRecycler((childDirPf + dataChild.cFileName).c_str(), isRecycler)) { if (isRecycler) return STATUS_REC_EXISTS; } else assert(false); } } while (::FindNextFile(hFindChild, &dataChild)); //ignore errors other than ERROR_NO_MORE_FILES } } } while (::FindNextFile(hFindRoot, &dataRoot)); // return STATUS_REC_MISSING; */ } #elif defined ZEN_LINUX || defined ZEN_MAC /* We really need access to a similar function to check whether a directory supports trashing and emit a warning if it does not! The following function looks perfect, alas it is restricted to local files and to the implementation of GIO only: gboolean _g_local_file_has_trash_dir(const char* dirpath, dev_t dir_dev); See: http://www.netmite.com/android/mydroid/2.0/external/bluetooth/glib/gio/glocalfileinfo.h Just checking for "G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH" is not correct, since we find in http://www.netmite.com/android/mydroid/2.0/external/bluetooth/glib/gio/glocalfileinfo.c g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH, writable && parent_info->has_trash_dir); => We're NOT interested in whether the specified folder can be trashed, but whether it supports thrashing its child elements! (Only support, not actual write access!) This renders G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH useless for this purpose. */ #endif