Mercurial > hg
view mercurial/win32.py @ 50757:19108906abaf stable
extensions: imp module is removed in Python 3.12 - use importlib to load files
imp has been deprecated for a long time, and has finally been removed in Python
3.12 .
imp was only used for loading extensions that has been specified with direct
.py path or path to a package directory. The same use cases can be achieved
quite simple with importlib, , possiby with small changes in corner cases with
undefined behaviour, such as extensions without .py source.
There might also be corner cases and undefined behaviour around use of
sys.modules and reloading.
author | Mads Kiilerich <mads@kiilerich.com> |
---|---|
date | Wed, 28 Jun 2023 14:23:13 +0200 |
parents | a9faacdc5943 |
children | 493034cc3265 |
line wrap: on
line source
# win32.py - utility functions that use win32 API # # Copyright 2005-2009 Olivia Mackall <olivia@selenic.com> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import ctypes import ctypes.wintypes as wintypes import errno import msvcrt import os import random import subprocess from typing import ( List, NoReturn, Optional, Tuple, ) from . import ( encoding, pycompat, ) # pytype: disable=module-attr _kernel32 = ctypes.windll.kernel32 _advapi32 = ctypes.windll.advapi32 _user32 = ctypes.windll.user32 _crypt32 = ctypes.windll.crypt32 # pytype: enable=module-attr _BOOL = ctypes.c_long _WORD = ctypes.c_ushort _DWORD = ctypes.c_ulong _UINT = ctypes.c_uint _LONG = ctypes.c_long _LPCSTR = _LPSTR = ctypes.c_char_p _HANDLE = ctypes.c_void_p _HWND = _HANDLE _PCCERT_CONTEXT = ctypes.c_void_p _MAX_PATH = wintypes.MAX_PATH _INVALID_HANDLE_VALUE = _HANDLE(-1).value # GetLastError _ERROR_SUCCESS = 0 _ERROR_NO_MORE_FILES = 18 _ERROR_INVALID_PARAMETER = 87 _ERROR_BROKEN_PIPE = 109 _ERROR_INSUFFICIENT_BUFFER = 122 _ERROR_NO_DATA = 232 # WPARAM is defined as UINT_PTR (unsigned type) # LPARAM is defined as LONG_PTR (signed type) if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p): _WPARAM = ctypes.c_ulong _LPARAM = ctypes.c_long elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p): _WPARAM = ctypes.c_ulonglong _LPARAM = ctypes.c_longlong class _FILETIME(ctypes.Structure): _fields_ = [('dwLowDateTime', _DWORD), ('dwHighDateTime', _DWORD)] class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure): _fields_ = [ ('dwFileAttributes', _DWORD), ('ftCreationTime', _FILETIME), ('ftLastAccessTime', _FILETIME), ('ftLastWriteTime', _FILETIME), ('dwVolumeSerialNumber', _DWORD), ('nFileSizeHigh', _DWORD), ('nFileSizeLow', _DWORD), ('nNumberOfLinks', _DWORD), ('nFileIndexHigh', _DWORD), ('nFileIndexLow', _DWORD), ] # CreateFile _FILE_SHARE_READ = 0x00000001 _FILE_SHARE_WRITE = 0x00000002 _FILE_SHARE_DELETE = 0x00000004 _OPEN_EXISTING = 3 _FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 # SetFileAttributes _FILE_ATTRIBUTE_NORMAL = 0x80 _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000 # Process Security and Access Rights _PROCESS_QUERY_INFORMATION = 0x0400 # GetExitCodeProcess _STILL_ACTIVE = 259 class _STARTUPINFO(ctypes.Structure): _fields_ = [ ('cb', _DWORD), ('lpReserved', _LPSTR), ('lpDesktop', _LPSTR), ('lpTitle', _LPSTR), ('dwX', _DWORD), ('dwY', _DWORD), ('dwXSize', _DWORD), ('dwYSize', _DWORD), ('dwXCountChars', _DWORD), ('dwYCountChars', _DWORD), ('dwFillAttribute', _DWORD), ('dwFlags', _DWORD), ('wShowWindow', _WORD), ('cbReserved2', _WORD), ('lpReserved2', ctypes.c_char_p), ('hStdInput', _HANDLE), ('hStdOutput', _HANDLE), ('hStdError', _HANDLE), ] class _PROCESS_INFORMATION(ctypes.Structure): _fields_ = [ ('hProcess', _HANDLE), ('hThread', _HANDLE), ('dwProcessId', _DWORD), ('dwThreadId', _DWORD), ] _CREATE_NO_WINDOW = 0x08000000 _SW_HIDE = 0 class _COORD(ctypes.Structure): _fields_ = [('X', ctypes.c_short), ('Y', ctypes.c_short)] class _SMALL_RECT(ctypes.Structure): _fields_ = [ ('Left', ctypes.c_short), ('Top', ctypes.c_short), ('Right', ctypes.c_short), ('Bottom', ctypes.c_short), ] class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): _fields_ = [ ('dwSize', _COORD), ('dwCursorPosition', _COORD), ('wAttributes', _WORD), ('srWindow', _SMALL_RECT), ('dwMaximumWindowSize', _COORD), ] _STD_OUTPUT_HANDLE = _DWORD(-11).value _STD_ERROR_HANDLE = _DWORD(-12).value # CERT_TRUST_STATUS dwErrorStatus CERT_TRUST_IS_PARTIAL_CHAIN = 0x10000 # CertCreateCertificateContext encodings X509_ASN_ENCODING = 0x00000001 PKCS_7_ASN_ENCODING = 0x00010000 # These structs are only complete enough to achieve what we need. class CERT_CHAIN_CONTEXT(ctypes.Structure): _fields_ = ( ("cbSize", _DWORD), # CERT_TRUST_STATUS struct ("dwErrorStatus", _DWORD), ("dwInfoStatus", _DWORD), ("cChain", _DWORD), ("rgpChain", ctypes.c_void_p), ("cLowerQualityChainContext", _DWORD), ("rgpLowerQualityChainContext", ctypes.c_void_p), ("fHasRevocationFreshnessTime", _BOOL), ("dwRevocationFreshnessTime", _DWORD), ) class CERT_USAGE_MATCH(ctypes.Structure): _fields_ = ( ("dwType", _DWORD), # CERT_ENHKEY_USAGE struct ("cUsageIdentifier", _DWORD), ("rgpszUsageIdentifier", ctypes.c_void_p), # LPSTR * ) class CERT_CHAIN_PARA(ctypes.Structure): _fields_ = ( ("cbSize", _DWORD), ("RequestedUsage", CERT_USAGE_MATCH), ("RequestedIssuancePolicy", CERT_USAGE_MATCH), ("dwUrlRetrievalTimeout", _DWORD), ("fCheckRevocationFreshnessTime", _BOOL), ("dwRevocationFreshnessTime", _DWORD), ("pftCacheResync", ctypes.c_void_p), # LPFILETIME ("pStrongSignPara", ctypes.c_void_p), # PCCERT_STRONG_SIGN_PARA ("dwStrongSignFlags", _DWORD), ) # types of parameters of C functions used (required by pypy) _crypt32.CertCreateCertificateContext.argtypes = [ _DWORD, # cert encoding ctypes.c_char_p, # cert _DWORD, ] # cert size _crypt32.CertCreateCertificateContext.restype = _PCCERT_CONTEXT _crypt32.CertGetCertificateChain.argtypes = [ ctypes.c_void_p, # HCERTCHAINENGINE _PCCERT_CONTEXT, ctypes.c_void_p, # LPFILETIME ctypes.c_void_p, # HCERTSTORE ctypes.c_void_p, # PCERT_CHAIN_PARA _DWORD, ctypes.c_void_p, # LPVOID ctypes.c_void_p, # PCCERT_CHAIN_CONTEXT * ] _crypt32.CertGetCertificateChain.restype = _BOOL _crypt32.CertFreeCertificateContext.argtypes = [_PCCERT_CONTEXT] _crypt32.CertFreeCertificateContext.restype = _BOOL _kernel32.CreateFileA.argtypes = [ _LPCSTR, _DWORD, _DWORD, ctypes.c_void_p, _DWORD, _DWORD, _HANDLE, ] _kernel32.CreateFileA.restype = _HANDLE _kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p] _kernel32.GetFileInformationByHandle.restype = _BOOL _kernel32.CloseHandle.argtypes = [_HANDLE] _kernel32.CloseHandle.restype = _BOOL try: _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p] _kernel32.CreateHardLinkA.restype = _BOOL except AttributeError: pass _kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD] _kernel32.SetFileAttributesA.restype = _BOOL _DRIVE_UNKNOWN = 0 _DRIVE_NO_ROOT_DIR = 1 _DRIVE_REMOVABLE = 2 _DRIVE_FIXED = 3 _DRIVE_REMOTE = 4 _DRIVE_CDROM = 5 _DRIVE_RAMDISK = 6 _kernel32.GetDriveTypeA.argtypes = [_LPCSTR] _kernel32.GetDriveTypeA.restype = _UINT _kernel32.GetVolumeInformationA.argtypes = [ _LPCSTR, ctypes.c_void_p, _DWORD, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, _DWORD, ] _kernel32.GetVolumeInformationA.restype = _BOOL _kernel32.GetVolumePathNameA.argtypes = [_LPCSTR, ctypes.c_void_p, _DWORD] _kernel32.GetVolumePathNameA.restype = _BOOL _kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD] _kernel32.OpenProcess.restype = _HANDLE _kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p] _kernel32.GetExitCodeProcess.restype = _BOOL _kernel32.GetLastError.argtypes = [] _kernel32.GetLastError.restype = _DWORD _kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD] _kernel32.GetModuleFileNameA.restype = _DWORD _kernel32.CreateProcessA.argtypes = [ _LPCSTR, _LPCSTR, ctypes.c_void_p, ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p, ctypes.c_void_p, ] _kernel32.CreateProcessA.restype = _BOOL _kernel32.ExitProcess.argtypes = [_UINT] _kernel32.ExitProcess.restype = None _kernel32.GetCurrentProcessId.argtypes = [] _kernel32.GetCurrentProcessId.restype = _DWORD # pytype: disable=module-attr _SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD) # pytype: enable=module-attr _kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL] _kernel32.SetConsoleCtrlHandler.restype = _BOOL _kernel32.SetConsoleMode.argtypes = [_HANDLE, _DWORD] _kernel32.SetConsoleMode.restype = _BOOL _kernel32.GetConsoleMode.argtypes = [_HANDLE, ctypes.c_void_p] _kernel32.GetConsoleMode.restype = _BOOL _kernel32.GetStdHandle.argtypes = [_DWORD] _kernel32.GetStdHandle.restype = _HANDLE _kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p] _kernel32.GetConsoleScreenBufferInfo.restype = _BOOL _advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p] _advapi32.GetUserNameA.restype = _BOOL _user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p] _user32.GetWindowThreadProcessId.restype = _DWORD _user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int] _user32.ShowWindow.restype = _BOOL # pytype: disable=module-attr _WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM) # pytype: enable=module-attr _user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM] _user32.EnumWindows.restype = _BOOL _kernel32.PeekNamedPipe.argtypes = [ _HANDLE, ctypes.c_void_p, _DWORD, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, ] _kernel32.PeekNamedPipe.restype = _BOOL def _raiseoserror(name: bytes) -> NoReturn: # Force the code to a signed int to avoid an 'int too large' error. # See https://bugs.python.org/issue28474 code = _kernel32.GetLastError() if code > 0x7FFFFFFF: code -= 2 ** 32 err = ctypes.WinError(code=code) # pytype: disable=module-attr raise OSError( err.errno, '%s: %s' % (encoding.strfromlocal(name), err.strerror) ) def _getfileinfo(name: bytes) -> _BY_HANDLE_FILE_INFORMATION: fh = _kernel32.CreateFileA( name, 0, _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE, None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None, ) if fh == _INVALID_HANDLE_VALUE: _raiseoserror(name) try: fi = _BY_HANDLE_FILE_INFORMATION() if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)): _raiseoserror(name) return fi finally: _kernel32.CloseHandle(fh) def checkcertificatechain(cert: bytes, build: bool = True) -> bool: """Tests the given certificate to see if there is a complete chain to a trusted root certificate. As a side effect, missing certificates are downloaded and installed unless ``build=False``. True is returned if a chain to a trusted root exists (even if built on the fly), otherwise False. NB: A chain to a trusted root does NOT imply that the certificate is valid. """ chainctxptr = ctypes.POINTER(CERT_CHAIN_CONTEXT) pchainctx = chainctxptr() chainpara = CERT_CHAIN_PARA( cbSize=ctypes.sizeof(CERT_CHAIN_PARA), RequestedUsage=CERT_USAGE_MATCH() ) certctx = _crypt32.CertCreateCertificateContext( X509_ASN_ENCODING, cert, len(cert) ) if certctx is None: _raiseoserror(b'CertCreateCertificateContext') flags = 0 if not build: flags |= 0x100 # CERT_CHAIN_DISABLE_AUTH_ROOT_AUTO_UPDATE try: # Building the certificate chain will update root certs as necessary. if not _crypt32.CertGetCertificateChain( None, # hChainEngine certctx, # pCertContext None, # pTime None, # hAdditionalStore ctypes.byref(chainpara), flags, None, # pvReserved ctypes.byref(pchainctx), ): _raiseoserror(b'CertGetCertificateChain') chainctx = pchainctx.contents return chainctx.dwErrorStatus & CERT_TRUST_IS_PARTIAL_CHAIN == 0 finally: if pchainctx: _crypt32.CertFreeCertificateChain(pchainctx) _crypt32.CertFreeCertificateContext(certctx) def oslink(src: bytes, dst: bytes) -> None: try: if not _kernel32.CreateHardLinkA(dst, src, None): _raiseoserror(src) except AttributeError: # Wine doesn't support this function _raiseoserror(src) def nlinks(name: bytes) -> int: '''return number of hardlinks for the given file''' return _getfileinfo(name).nNumberOfLinks def samefile(path1: bytes, path2: bytes) -> bool: '''Returns whether path1 and path2 refer to the same file or directory.''' res1 = _getfileinfo(path1) res2 = _getfileinfo(path2) return ( res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber and res1.nFileIndexHigh == res2.nFileIndexHigh and res1.nFileIndexLow == res2.nFileIndexLow ) def samedevice(path1: bytes, path2: bytes) -> bool: '''Returns whether path1 and path2 are on the same device.''' res1 = _getfileinfo(path1) res2 = _getfileinfo(path2) return res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber def peekpipe(pipe) -> int: handle = msvcrt.get_osfhandle(pipe.fileno()) # pytype: disable=module-attr avail = _DWORD() if not _kernel32.PeekNamedPipe( handle, None, 0, None, ctypes.byref(avail), None ): err = _kernel32.GetLastError() if err == _ERROR_BROKEN_PIPE: return 0 raise ctypes.WinError(err) # pytype: disable=module-attr return avail.value def lasterrorwaspipeerror(err) -> bool: if err.errno != errno.EINVAL: return False err = _kernel32.GetLastError() return err == _ERROR_BROKEN_PIPE or err == _ERROR_NO_DATA def testpid(pid: int) -> bool: """return True if pid is still running or unable to determine, False otherwise""" h = _kernel32.OpenProcess(_PROCESS_QUERY_INFORMATION, False, pid) if h: try: status = _DWORD() if _kernel32.GetExitCodeProcess(h, ctypes.byref(status)): return status.value == _STILL_ACTIVE finally: _kernel32.CloseHandle(h) return _kernel32.GetLastError() != _ERROR_INVALID_PARAMETER def executablepath() -> bytes: '''return full path of hg.exe''' size = 600 buf = ctypes.create_string_buffer(size + 1) len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size) # pytype: disable=module-attr if len == 0: raise ctypes.WinError() # Note: WinError is a function elif len == size: raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER) # pytype: enable=module-attr return buf.value def getvolumename(path: bytes) -> Optional[bytes]: """Get the mount point of the filesystem from a directory or file (best-effort) Returns None if we are unsure. Raises OSError on ENOENT, EPERM, etc. """ # realpath() calls GetFullPathName() realpath = os.path.realpath(path) # allocate at least MAX_PATH long since GetVolumePathName('c:\\', buf, 4) # somehow fails on Windows XP size = max(len(realpath), _MAX_PATH) + 1 buf = ctypes.create_string_buffer(size) if not _kernel32.GetVolumePathNameA(realpath, ctypes.byref(buf), size): # Note: WinError is a function raise ctypes.WinError() # pytype: disable=module-attr return buf.value def getfstype(path: bytes) -> Optional[bytes]: """Get the filesystem type name from a directory or file (best-effort) Returns None if we are unsure. Raises OSError on ENOENT, EPERM, etc. """ volume = getvolumename(path) t = _kernel32.GetDriveTypeA(volume) if t == _DRIVE_REMOTE: return b'cifs' elif t not in ( _DRIVE_REMOVABLE, _DRIVE_FIXED, _DRIVE_CDROM, _DRIVE_RAMDISK, ): return None size = _MAX_PATH + 1 name = ctypes.create_string_buffer(size) if not _kernel32.GetVolumeInformationA( volume, None, 0, None, None, None, ctypes.byref(name), size ): # Note: WinError is a function raise ctypes.WinError() # pytype: disable=module-attr return name.value def getuser() -> bytes: '''return name of current user''' size = _DWORD(300) buf = ctypes.create_string_buffer(size.value + 1) if not _advapi32.GetUserNameA(ctypes.byref(buf), ctypes.byref(size)): raise ctypes.WinError() # pytype: disable=module-attr return buf.value _signalhandler: List[_SIGNAL_HANDLER] = [] def setsignalhandler() -> None: """Register a termination handler for console events including CTRL+C. python signal handlers do not work well with socket operations. """ def handler(event): _kernel32.ExitProcess(1) if _signalhandler: return # already registered h = _SIGNAL_HANDLER(handler) _signalhandler.append(h) # needed to prevent garbage collection if not _kernel32.SetConsoleCtrlHandler(h, True): raise ctypes.WinError() # pytype: disable=module-attr def hidewindow() -> None: def callback(hwnd, pid): wpid = _DWORD() _user32.GetWindowThreadProcessId(hwnd, ctypes.byref(wpid)) if pid == wpid.value: _user32.ShowWindow(hwnd, _SW_HIDE) return False # stop enumerating windows return True pid = _kernel32.GetCurrentProcessId() _user32.EnumWindows(_WNDENUMPROC(callback), pid) def termsize() -> Tuple[int, int]: # cmd.exe does not handle CR like a unix console, the CR is # counted in the line length. On 80 columns consoles, if 80 # characters are written, the following CR won't apply on the # current line but on the new one. Keep room for it. width = 80 - 1 height = 25 # Query stderr to avoid problems with redirections screenbuf = _kernel32.GetStdHandle( _STD_ERROR_HANDLE ) # don't close the handle returned if screenbuf is None or screenbuf == _INVALID_HANDLE_VALUE: return width, height csbi = _CONSOLE_SCREEN_BUFFER_INFO() if not _kernel32.GetConsoleScreenBufferInfo(screenbuf, ctypes.byref(csbi)): return width, height width = csbi.srWindow.Right - csbi.srWindow.Left # don't '+ 1' height = csbi.srWindow.Bottom - csbi.srWindow.Top + 1 return width, height def enablevtmode() -> bool: """Enable virtual terminal mode for the associated console. Return True if enabled, else False.""" ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x4 handle = _kernel32.GetStdHandle( _STD_OUTPUT_HANDLE ) # don't close the handle if handle == _INVALID_HANDLE_VALUE: return False mode = _DWORD(0) if not _kernel32.GetConsoleMode(handle, ctypes.byref(mode)): return False if (mode.value & ENABLE_VIRTUAL_TERMINAL_PROCESSING) == 0: mode.value |= ENABLE_VIRTUAL_TERMINAL_PROCESSING if not _kernel32.SetConsoleMode(handle, mode): return False return True def spawndetached(args: List[bytes]) -> int: # No standard library function really spawns a fully detached # process under win32 because they allocate pipes or other objects # to handle standard streams communications. Passing these objects # to the child process requires handle inheritance to be enabled # which makes really detached processes impossible. si = _STARTUPINFO() si.cb = ctypes.sizeof(_STARTUPINFO) pi = _PROCESS_INFORMATION() env = b'' for k in encoding.environ: env += b"%s=%s\0" % (k, encoding.environ[k]) if not env: env = b'\0' env += b'\0' args = subprocess.list2cmdline(pycompat.rapply(encoding.strfromlocal, args)) # TODO: CreateProcessW on py3? res = _kernel32.CreateProcessA( None, encoding.strtolocal(args), None, None, False, _CREATE_NO_WINDOW, env, encoding.getcwd(), ctypes.byref(si), ctypes.byref(pi), ) if not res: raise ctypes.WinError() # pytype: disable=module-attr _kernel32.CloseHandle(pi.hProcess) _kernel32.CloseHandle(pi.hThread) return pi.dwProcessId def unlink(f: bytes) -> None: '''try to implement POSIX' unlink semantics on Windows''' if os.path.isdir(f): # use EPERM because it is POSIX prescribed value, even though # unlink(2) on directories returns EISDIR on Linux raise IOError( errno.EPERM, r"Unlinking directory not permitted: '%s'" % encoding.strfromlocal(f), ) # POSIX allows to unlink and rename open files. Windows has serious # problems with doing that: # - Calling os.unlink (or os.rename) on a file f fails if f or any # hardlinked copy of f has been opened with Python's open(). There is no # way such a file can be deleted or renamed on Windows (other than # scheduling the delete or rename for the next reboot). # - Calling os.unlink on a file that has been opened with Mercurial's # posixfile (or comparable methods) will delay the actual deletion of # the file for as long as the file is held open. The filename is blocked # during that time and cannot be used for recreating a new file under # that same name ("zombie file"). Directories containing such zombie files # cannot be removed or moved. # A file that has been opened with posixfile can be renamed, so we rename # f to a random temporary name before calling os.unlink on it. This allows # callers to recreate f immediately while having other readers do their # implicit zombie filename blocking on a temporary name. for tries in range(10): temp = b'%s-%08x' % (f, random.randint(0, 0xFFFFFFFF)) try: os.rename(f, temp) break except FileExistsError: pass else: raise IOError(errno.EEXIST, "No usable temporary filename found") try: os.unlink(temp) except OSError: # The unlink might have failed because the READONLY attribute may heave # been set on the original file. Rename works fine with READONLY set, # but not os.unlink. Reset all attributes and try again. _kernel32.SetFileAttributesA(temp, _FILE_ATTRIBUTE_NORMAL) try: os.unlink(temp) except OSError: # The unlink might have failed due to some very rude AV-Scanners. # Leaking a tempfile is the lesser evil than aborting here and # leaving some potentially serious inconsistencies. pass def makedir(path: bytes, notindexed: bool) -> None: os.mkdir(path) if notindexed: _kernel32.SetFileAttributesA(path, _FILE_ATTRIBUTE_NOT_CONTENT_INDEXED)