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pyfakefs
fake_pathlib.py
# Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """A fake implementation for pathlib working with FakeFilesystem. New in pyfakefs 3.0. Usage: If using `fake_filesystem_unittest.TestCase`, pytest fs fixture, or directly `Patcher`, pathlib gets replaced by fake_pathlib together with other file system related modules. Note: as the implementation is based on FakeFilesystem, all faked classes (including PurePosixPath, PosixPath, PureWindowsPath and WindowsPath) get the properties of the underlying fake filesystem. """ import errno import fnmatch import functools import inspect import ntpath import os import pathlib import posixpath import re import sys import warnings from pathlib import PurePath from typing import Callable, List, Optional from unittest import mock from urllib.parse import quote_from_bytes as urlquote_from_bytes from pyfakefs import fake_scandir from pyfakefs.fake_filesystem import FakeFilesystem from pyfakefs.fake_open import fake_open from pyfakefs.fake_os import FakeOsModule, use_original_os from pyfakefs.fake_path import FakePathModule from pyfakefs.helpers import IS_PYPY, is_called_from_skipped_module, FSType _WIN_RESERVED_NAMES = ( {"CON", "PRN", "AUX", "NUL"} | {"COM%d" % i for i in range(1, 10)} | {"LPT%d" % i for i in range(1, 10)} ) def init_module(filesystem): """Initializes the fake module with the fake file system.""" # pylint: disable=protected-access FakePath.filesystem = filesystem if sys.version_info < (3, 12): FakePathlibModule.WindowsPath._flavour = _FakeWindowsFlavour(filesystem) FakePathlibModule.PosixPath._flavour = _FakePosixFlavour(filesystem) # Pure POSIX path separators must be filesystem-independent. fake_pure_posix_flavour = _FakePosixFlavour(filesystem) fake_pure_posix_flavour.sep = "/" fake_pure_posix_flavour.altsep = None FakePathlibModule.PurePosixPath._flavour = fake_pure_posix_flavour # Pure Windows path separators must be filesystem-independent. fake_pure_nt_flavour = _FakeWindowsFlavour(filesystem) fake_pure_nt_flavour.sep = "\\" fake_pure_nt_flavour.altsep = "/" FakePathlibModule.PureWindowsPath._flavour = fake_pure_nt_flavour else: # in Python > 3.11, the flavour is no longer a separate class, # but points to the os-specific path module (posixpath/ntpath) fake_os_posix = FakeOsModule(filesystem) if filesystem.is_windows_fs: fake_os_posix.path = FakePosixPathModule(filesystem, fake_os_posix) fake_os_windows = FakeOsModule(filesystem) if not filesystem.is_windows_fs: fake_os_windows.path = FakeWindowsPathModule(filesystem, fake_os_windows) parser_name = "_flavour" if sys.version_info < (3, 13) else "parser" # Pure POSIX path properties must be filesystem independent. setattr(FakePathlibModule.PurePosixPath, parser_name, fake_os_posix.path) # Pure Windows path properties must be filesystem independent. setattr(FakePathlibModule.PureWindowsPath, parser_name, fake_os_windows.path) def _wrap_strfunc(fake_fct, original_fct): @functools.wraps(fake_fct) def _wrapped(pathobj, *args, **kwargs): fs: FakeFilesystem = pathobj.filesystem if fs.patcher: if is_called_from_skipped_module( skip_names=fs.patcher.skip_names, case_sensitive=fs.is_case_sensitive, ): return original_fct(str(pathobj), *args, **kwargs) return fake_fct(fs, str(pathobj), *args, **kwargs) return staticmethod(_wrapped) def _wrap_binary_strfunc(fake_fct, original_fct): @functools.wraps(fake_fct) def _wrapped(pathobj1, pathobj2, *args): fs: FakeFilesystem = pathobj1.filesystem if fs.patcher: if is_called_from_skipped_module( skip_names=fs.patcher.skip_names, case_sensitive=fs.is_case_sensitive, ): return original_fct(str(pathobj1), str(pathobj2), *args) return fake_fct(fs, str(pathobj1), str(pathobj2), *args) return staticmethod(_wrapped) def _wrap_binary_strfunc_reverse(fake_fct, original_fct): @functools.wraps(fake_fct) def _wrapped(pathobj1, pathobj2, *args): fs: FakeFilesystem = pathobj2.filesystem if fs.patcher: if is_called_from_skipped_module( skip_names=fs.patcher.skip_names, case_sensitive=fs.is_case_sensitive, ): return original_fct(str(pathobj2), str(pathobj1), *args) return fake_fct(fs, str(pathobj2), str(pathobj1), *args) return staticmethod(_wrapped) try: accessor = pathlib._Accessor # type: ignore[attr-defined] except AttributeError: accessor = object class _FakeAccessor(accessor): # type: ignore[valid-type, misc] """Accessor which forwards some of the functions to FakeFilesystem methods. """ stat = _wrap_strfunc(FakeFilesystem.stat, os.stat) lstat = _wrap_strfunc( lambda fs, path: FakeFilesystem.stat(fs, path, follow_symlinks=False), os.lstat ) listdir = _wrap_strfunc(FakeFilesystem.listdir, os.listdir) scandir = _wrap_strfunc(fake_scandir.scandir, os.scandir) if hasattr(os, "lchmod"): lchmod = _wrap_strfunc( lambda fs, path, mode: FakeFilesystem.chmod( fs, path, mode, follow_symlinks=False ), os.lchmod, ) else: def lchmod(self, pathobj, *args, **kwargs): """Raises not implemented for Windows systems.""" raise NotImplementedError("lchmod() not available on this system") def chmod(self, pathobj, *args, **kwargs): if "follow_symlinks" in kwargs: if sys.version_info < (3, 10): raise TypeError( "chmod() got an unexpected keyword argument 'follow_symlinks'" ) if not kwargs["follow_symlinks"] and ( os.chmod not in os.supports_follow_symlinks or IS_PYPY ): raise NotImplementedError( "`follow_symlinks` for chmod() is not available on this system" ) return pathobj.filesystem.chmod(str(pathobj), *args, **kwargs) mkdir = _wrap_strfunc(FakeFilesystem.makedir, os.mkdir) unlink = _wrap_strfunc(FakeFilesystem.remove, os.unlink) rmdir = _wrap_strfunc(FakeFilesystem.rmdir, os.rmdir) rename = _wrap_binary_strfunc(FakeFilesystem.rename, os.rename) replace = _wrap_binary_strfunc( lambda fs, old_path, new_path: FakeFilesystem.rename( fs, old_path, new_path, force_replace=True ), os.replace, ) symlink = _wrap_binary_strfunc_reverse( lambda fs, fpath, target, target_is_dir: FakeFilesystem.create_symlink( fs, fpath, target, create_missing_dirs=False ), os.symlink, ) if (3, 8) <= sys.version_info: link_to = _wrap_binary_strfunc( lambda fs, file_path, link_target: FakeFilesystem.link( fs, file_path, link_target ), os.link, ) if sys.version_info >= (3, 10): link = _wrap_binary_strfunc( lambda fs, file_path, link_target: FakeFilesystem.link( fs, file_path, link_target ), os.link, ) # this will use the fake filesystem because os is patched def getcwd(self): return os.getcwd() readlink = _wrap_strfunc(FakeFilesystem.readlink, os.readlink) utime = _wrap_strfunc(FakeFilesystem.utime, os.utime) _fake_accessor = _FakeAccessor() if sys.version_info < (3, 12): flavour = pathlib._Flavour # type: ignore[attr-defined] class _FakeFlavour(flavour): # type: ignore[valid-type, misc] """Fake Flavour implementation used by PurePath and _Flavour""" filesystem = None ext_namespace_prefix = "\\\\?\\" drive_letters = {chr(x) for x in range(ord("a"), ord("z") + 1)} | { chr(x) for x in range(ord("A"), ord("Z") + 1) } def __init__(self, filesystem): self.filesystem = filesystem super().__init__() @staticmethod def _split_extended_path(path, ext_prefix=ext_namespace_prefix): prefix = "" if path.startswith(ext_prefix): prefix = path[:4] path = path[4:] if path.startswith("UNC\\"): prefix += path[:3] path = "\\" + path[3:] return prefix, path def _splitroot_with_drive(self, path, sep): first = path[0:1] second = path[1:2] if second == sep and first == sep: # extended paths should also disable the collapsing of "." # components (according to MSDN docs). prefix, path = self._split_extended_path(path) first = path[0:1] second = path[1:2] else: prefix = "" third = path[2:3] if second == sep and first == sep and third != sep: # is a UNC path: # vvvvvvvvvvvvvvvvvvvvv root # \\machine\mountpoint\directory\etc\... # directory ^^^^^^^^^^^^^^ index = path.find(sep, 2) if index != -1: index2 = path.find(sep, index + 1) # a UNC path can't have two slashes in a row # (after the initial two) if index2 != index + 1: if index2 == -1: index2 = len(path) if prefix: return prefix + path[1:index2], sep, path[index2 + 1 :] return path[:index2], sep, path[index2 + 1 :] drv = root = "" if second == ":" and first in self.drive_letters: drv = path[:2] path = path[2:] first = third if first == sep: root = first path = path.lstrip(sep) return prefix + drv, root, path @staticmethod def _splitroot_posix(path, sep): if path and path[0] == sep: stripped_part = path.lstrip(sep) if len(path) - len(stripped_part) == 2: return "", sep * 2, stripped_part return "", sep, stripped_part else: return "", "", path def splitroot(self, path, sep=None): """Split path into drive, root and rest.""" is_windows = isinstance(self, _FakeWindowsFlavour) if sep is None: if is_windows == self.filesystem.is_windows_fs: sep = self.filesystem.path_separator else: sep = self.sep if is_windows: return self._splitroot_with_drive(path, sep) return self._splitroot_posix(path, sep) def casefold(self, path): """Return the lower-case version of s for a Windows filesystem.""" if self.filesystem.is_windows_fs: return path.lower() return path def casefold_parts(self, parts): """Return the lower-case version of parts for a Windows filesystem.""" if self.filesystem.is_windows_fs: return [p.lower() for p in parts] return parts def _resolve_posix(self, path, strict): sep = self.sep seen = {} def _resolve(path, rest): if rest.startswith(sep): path = "" for name in rest.split(sep): if not name or name == ".": # current dir continue if name == "..": # parent dir path, _, _ = path.rpartition(sep) continue newpath = path + sep + name if newpath in seen: # Already seen this path path = seen[newpath] if path is not None: # use cached value continue # The symlink is not resolved, so we must have # a symlink loop. raise RuntimeError("Symlink loop from %r" % newpath) # Resolve the symbolic link try: target = self.filesystem.readlink(newpath) except OSError as e: if e.errno != errno.EINVAL and strict: raise # Not a symlink, or non-strict mode. We just leave the path # untouched. path = newpath else: seen[newpath] = None # not resolved symlink path = _resolve(path, target) seen[newpath] = path # resolved symlink return path # NOTE: according to POSIX, getcwd() cannot contain path components # which are symlinks. base = "" if path.is_absolute() else self.filesystem.cwd return _resolve(base, str(path)) or sep def _resolve_windows(self, path, strict): path = str(path) if not path: return os.getcwd() previous_s = None if strict: if not self.filesystem.exists(path): self.filesystem.raise_os_error(errno.ENOENT, path) return self.filesystem.resolve_path(path) else: while True: try: path = self.filesystem.resolve_path(path) except OSError: previous_s = path path = self.filesystem.splitpath(path)[0] else: if previous_s is None: return path return self.filesystem.joinpaths( path, os.path.basename(previous_s) ) def resolve(self, path, strict): """Make the path absolute, resolving any symlinks.""" if self.filesystem.is_windows_fs: return self._resolve_windows(path, strict) return self._resolve_posix(path, strict) def gethomedir(self, username): """Return the home directory of the current user.""" if not username: try: return os.environ["HOME"] except KeyError: import pwd return pwd.getpwuid(os.getuid()).pw_dir else: import pwd try: return pwd.getpwnam(username).pw_dir except KeyError: raise RuntimeError( "Can't determine home directory for %r" % username ) class _FakeWindowsFlavour(_FakeFlavour): """Flavour used by PureWindowsPath with some Windows specific implementations independent of FakeFilesystem properties. """ sep = "\\" altsep = "/" has_drv = True pathmod = ntpath def is_reserved(self, parts): """Return `True` if the path is considered reserved under Windows.""" # NOTE: the rules for reserved names seem somewhat complicated # (e.g. r"..\NUL" is reserved but not r"foo\NUL"). # We err on the side of caution and return True for paths which are # not considered reserved by Windows. if not parts: return False if self.filesystem.is_windows_fs and parts[0].startswith("\\\\"): # UNC paths are never reserved return False return parts[-1].partition(".")[0].upper() in _WIN_RESERVED_NAMES def make_uri(self, path): """Return a file URI for the given path""" # Under Windows, file URIs use the UTF-8 encoding. # original version, not faked drive = path.drive if len(drive) == 2 and drive[1] == ":": # It's a path on a local drive => 'file:///c:/a/b' rest = path.as_posix()[2:].lstrip("/") return "file:///{}/{}".format( drive, urlquote_from_bytes(rest.encode("utf-8")), ) else: # It's a path on a network drive => 'file://host/share/a/b' return "file:" + urlquote_from_bytes(path.as_posix().encode("utf-8")) def gethomedir(self, username): """Return the home directory of the current user.""" # original version, not faked if "HOME" in os.environ: userhome = os.environ["HOME"] elif "USERPROFILE" in os.environ: userhome = os.environ["USERPROFILE"] elif "HOMEPATH" in os.environ: try: drv = os.environ["HOMEDRIVE"] except KeyError: drv = "" userhome = drv + os.environ["HOMEPATH"] else: raise RuntimeError("Can't determine home directory") if username: # Try to guess user home directory. By default all users # directories are located in the same place and are named by # corresponding usernames. If current user home directory points # to nonstandard place, this guess is likely wrong. if os.environ["USERNAME"] != username: drv, root, parts = self.parse_parts((userhome,)) if parts[-1] != os.environ["USERNAME"]: raise RuntimeError( "Can't determine home directory for %r" % username ) parts[-1] = username if drv or root: userhome = drv + root + self.join(parts[1:]) else: userhome = self.join(parts) return userhome def compile_pattern(self, pattern): return re.compile(fnmatch.translate(pattern), re.IGNORECASE).fullmatch class _FakePosixFlavour(_FakeFlavour): """Flavour used by PurePosixPath with some Unix specific implementations independent of FakeFilesystem properties. """ sep = "/" altsep: Optional[str] = None has_drv = False pathmod = posixpath def is_reserved(self, parts): return False def make_uri(self, path): # We represent the path using the local filesystem encoding, # for portability to other applications. bpath = bytes(path) return "file://" + urlquote_from_bytes(bpath) def gethomedir(self, username): # original version, not faked if not username: try: return os.environ["HOME"] except KeyError: import pwd return pwd.getpwuid(os.getuid()).pw_dir else: import pwd try: return pwd.getpwnam(username).pw_dir except KeyError: raise RuntimeError( "Can't determine home directory for %r" % username ) def compile_pattern(self, pattern): return re.compile(fnmatch.translate(pattern)).fullmatch else: # Python >= 3.12 class FakePosixPathModule(FakePathModule): def __init__(self, filesystem: "FakeFilesystem", os_module: "FakeOsModule"): super().__init__(filesystem, os_module) with self.filesystem.use_fs_type(FSType.POSIX): self.reset(self.filesystem) class FakeWindowsPathModule(FakePathModule): def __init__(self, filesystem: "FakeFilesystem", os_module: "FakeOsModule"): super().__init__(filesystem, os_module) with self.filesystem.use_fs_type(FSType.WINDOWS): self.reset(self.filesystem) def with_fs_type(f: Callable, fs_type: FSType) -> Callable: """Decorator used for fake_path methods to ensure that the correct filesystem type is used.""" @functools.wraps(f) def wrapped(self, *args, **kwargs): with self.filesystem.use_fs_type(fs_type): return f(self, *args, **kwargs) return wrapped # decorate all public functions to use the correct fs type for fct_name in FakePathModule.dir(): fn = getattr(FakePathModule, fct_name) setattr(FakeWindowsPathModule, fct_name, with_fs_type(fn, FSType.WINDOWS)) setattr(FakePosixPathModule, fct_name, with_fs_type(fn, FSType.POSIX)) class FakePath(pathlib.Path): """Replacement for pathlib.Path. Reimplement some methods to use fake filesystem. The rest of the methods work as they are, as they will use the fake accessor. New in pyfakefs 3.0. """ # the underlying fake filesystem filesystem = None skip_names: List[str] = [] def __new__(cls, *args, **kwargs): """Creates the correct subclass based on OS.""" if cls is FakePathlibModule.Path: cls = ( FakePathlibModule.WindowsPath if cls.filesystem.is_windows_fs else FakePathlibModule.PosixPath ) if sys.version_info < (3, 12): return cls._from_parts(args) # pytype: disable=attribute-error else: return object.__new__(cls) if sys.version_info[:2] == (3, 10): # Overwritten class methods to call _init to set the fake accessor, # which is not done in Python 3.10, and not needed from Python 3.11 on @classmethod def _from_parts(cls, args): self = object.__new__(cls) self._init() drv, root, parts = self._parse_args(args) # pytype: disable=attribute-error self._drv = drv self._root = root self._parts = parts return self @classmethod def _from_parsed_parts(cls, drv, root, parts): self = object.__new__(cls) self._drv = drv self._root = root self._parts = parts self._init() return self if sys.version_info < (3, 11): def _init(self, template=None): """Initializer called from base class.""" # only needed until Python 3.10 self._accessor = _fake_accessor # only needed until Python 3.8 self._closed = False def _path(self): """Returns the underlying path string as used by the fake filesystem. """ return str(self) @classmethod def cwd(cls): """Return a new path pointing to the current working directory (as returned by os.getcwd()). """ return cls(cls.filesystem.cwd) if sys.version_info < (3, 12): # in 3.12, we can use the pathlib implementation def resolve(self, strict=None): """Make the path absolute, resolving all symlinks on the way and also normalizing it (for example turning slashes into backslashes under Windows). Args: strict: If `False` (default) no exception is raised if the path does not exist. Raises: OSError: if the path doesn't exist (strict=True) """ if strict is None: strict = False self._raise_on_closed() path = self._flavour.resolve( self, strict=strict ) # pytype: disable=attribute-error if path is None: self.stat() path = str(self.absolute()) path = self.filesystem.absnormpath(path) return FakePath(path) def open(self, mode="r", buffering=-1, encoding=None, errors=None, newline=None): """Open the file pointed by this path and return a fake file object. Raises: OSError: if the target object is a directory, the path is invalid or permission is denied. """ self._raise_on_closed() return fake_open( self.filesystem, self.skip_names, self._path(), mode, buffering, encoding, errors, newline, ) def read_bytes(self): """Open the fake file in bytes mode, read it, and close the file. Raises: OSError: if the target object is a directory, the path is invalid or permission is denied. """ with fake_open( self.filesystem, self.skip_names, self._path(), mode="rb", ) as f: return f.read() def read_text(self, encoding=None, errors=None): """ Open the fake file in text mode, read it, and close the file. """ with fake_open( self.filesystem, self.skip_names, self._path(), mode="r", encoding=encoding, errors=errors, ) as f: return f.read() def write_bytes(self, data): """Open the fake file in bytes mode, write to it, and close the file. Args: data: the bytes to be written Raises: OSError: if the target object is a directory, the path is invalid or permission is denied. """ # type-check for the buffer interface before truncating the file view = memoryview(data) with fake_open( self.filesystem, self.skip_names, self._path(), mode="wb", ) as f: return f.write(view) def write_text(self, data, encoding=None, errors=None, newline=None): """Open the fake file in text mode, write to it, and close the file. Args: data: the string to be written encoding: the encoding used for the string; if not given, the default locale encoding is used errors: (str) Defines how encoding errors are handled. newline: Controls universal newlines, passed to stream object. New in Python 3.10. Raises: TypeError: if data is not of type 'str'. OSError: if the target object is a directory, the path is invalid or permission is denied. """ if not isinstance(data, str): raise TypeError("data must be str, not %s" % data.__class__.__name__) if newline is not None and sys.version_info < (3, 10): raise TypeError("write_text() got an unexpected keyword argument 'newline'") with fake_open( self.filesystem, self.skip_names, self._path(), mode="w", encoding=encoding, errors=errors, newline=newline, ) as f: return f.write(data) @classmethod def home(cls): """Return a new path pointing to the user's home directory (as returned by os.path.expanduser('~')). """ home = os.path.expanduser("~") if cls.filesystem.is_windows_fs != (os.name == "nt"): username = os.path.split(home)[1] if cls.filesystem.is_windows_fs: home = os.path.join("C:", "Users", username) else: home = os.path.join("home", username) if not cls.filesystem.exists(home): cls.filesystem.create_dir(home) return cls(home.replace(os.sep, cls.filesystem.path_separator)) def samefile(self, other_path): """Return whether other_path is the same or not as this file (as returned by os.path.samefile()). Args: other_path: A path object or string of the file object to be compared with Raises: OSError: if the filesystem object doesn't exist. """ st = self.stat() try: other_st = other_path.stat() except AttributeError: other_st = self.filesystem.stat(other_path) return st.st_ino == other_st.st_ino and st.st_dev == other_st.st_dev def expanduser(self): """Return a new path with expanded ~ and ~user constructs (as returned by os.path.expanduser) """ return FakePath( os.path.expanduser(self._path()).replace( os.path.sep, self.filesystem.path_separator ) ) def _raise_on_closed(self): if sys.version_info < (3, 9) and self._closed: self._raise_closed() def touch(self, mode=0o666, exist_ok=True): """Create a fake file for the path with the given access mode, if it doesn't exist. Args: mode: the file mode for the file if it does not exist exist_ok: if the file already exists and this is `True`, nothing happens, otherwise `FileExistError` is raised Raises: FileExistsError: if the file exists and ``exits_ok`` is `False`. """ self._raise_on_closed() if self.exists(): if exist_ok: self.filesystem.utime(self._path(), times=None) else: self.filesystem.raise_os_error(errno.EEXIST, self._path()) else: fake_file = self.open("w", encoding="utf8") fake_file.close() self.chmod(mode) if sys.version_info >= (3, 14): def _copy_from_file(self, source, preserve_metadata=False): if sys.platform == "win32": # do not use the optimized version that uses OS functions in Windows if hasattr(self, "_copy_from_file_fallback"): return self._copy_from_file_fallback(source, preserve_metadata) else: return super()._copy_from_file(source, preserve_metadata) # type: ignore[attr-defined] else: # make pathlib think that no system calls are available so that it # will fall back to pure Python calls pathlib_os = pathlib.pathlib_module._os # type: ignore[attr-defined] old_fcopyfile = pathlib_os._fcopyfile pathlib_os._fcopyfile = None old_copy_file_range = pathlib_os._copy_file_range # type: ignore[attr-defined] pathlib_os._copy_file_range = None old_ficlone = pathlib_os._ficlone # type: ignore[attr-defined] pathlib_os._ficlone = None old_sendfile = pathlib_os._sendfile # type: ignore[attr-defined] pathlib_os._sendfile = None try: return super()._copy_from_file(source, preserve_metadata) # type: ignore[attr-defined] finally: pathlib_os._fcopyfile = old_fcopyfile pathlib_os._copy_file_range = old_copy_file_range pathlib_os._ficlone = old_ficlone pathlib_os._sendfile = old_sendfile def _warn_is_reserved_deprecated(): if sys.version_info >= (3, 13): warnings.warn( "pathlib.PurePath.is_reserved() is deprecated and scheduled " "for removal in Python 3.15. Use os.path.isreserved() to detect " "reserved paths on Windows.", DeprecationWarning, ) class FakePathlibModule: """Uses FakeFilesystem to provide a fake pathlib module replacement. Automatically created if using `fake_filesystem_unittest.TestCase`, the `fs` fixture, the `patchfs` decorator, or directly the `Patcher`. """ def __init__(self, filesystem, from_patcher=False): """ Initializes the module with the given filesystem. Args: filesystem: FakeFilesystem used to provide file system information from_patcher: If `False` (the default), `pathlib.os` will be manually patched using `FakeOsModule`. This allows to instantiate the class manually for a test. Will be set to `True` if instantiated from `Patcher`. """ init_module(filesystem) self.pathlib_module = pathlib self._os = None self._os_patcher = None if not from_patcher: self.patch_os_module() def patch_os_module(self): if sys.version_info >= (3, 11) and not isinstance(os, FakeOsModule): self._os = FakeOsModule(FakePath.filesystem) pathlib_os = ( "pathlib._local.os" if sys.version_info[:2] == (3, 13) else "pathlib.os" ) self._os_patcher = mock.patch(pathlib_os, self._os) self._os_patcher.start() def __del__(self): if self._os_patcher is not None: self._os_patcher.stop() class PurePosixPath(PurePath): """A subclass of PurePath that represents non-Windows filesystem paths""" __slots__ = () if sys.version_info >= (3, 12): def is_reserved(self): _warn_is_reserved_deprecated() return False def is_absolute(self): with os.path.filesystem.use_fs_type(FSType.POSIX): # type: ignore[module-attr] return os.path.isabs(self) def joinpath(self, *pathsegments): with os.path.filesystem.use_fs_type(FSType.POSIX): # type: ignore[module-attr] return super().joinpath(*pathsegments) class PureWindowsPath(PurePath): """A subclass of PurePath that represents Windows filesystem paths""" __slots__ = () if sys.version_info >= (3, 12): """These are reimplemented because the PurePath implementation checks the flavour against ntpath/posixpath. """ def is_reserved(self): _warn_is_reserved_deprecated() if sys.version_info < (3, 13): if not self._tail or self._tail[0].startswith("\\\\"): # UNC paths are never reserved. return False name = ( self._tail[-1].partition(".")[0].partition(":")[0].rstrip(" ") ) return name.upper() in _WIN_RESERVED_NAMES with os.path.filesystem.use_fs_type(FSType.WINDOWS): # type: ignore[module-attr] return os.path.isreserved(self) def is_absolute(self): with os.path.filesystem.use_fs_type(FSType.WINDOWS): return bool(self.drive and self.root) class WindowsPath(FakePath, PureWindowsPath): """A subclass of Path and PureWindowsPath that represents concrete Windows filesystem paths. """ __slots__ = () def owner(self): raise NotImplementedError("Path.owner() is unsupported on this system") def group(self): raise NotImplementedError("Path.group() is unsupported on this system") def is_mount(self): raise NotImplementedError("Path.is_mount() is unsupported on this system") class PosixPath(FakePath, PurePosixPath): """A subclass of Path and PurePosixPath that represents concrete non-Windows filesystem paths. """ __slots__ = () def owner(self): """Return the username of the file owner. It is assumed that `st_uid` is related to a real user, otherwise `KeyError` is raised. """ import pwd return pwd.getpwuid(self.stat().st_uid).pw_name def group(self): """Return the group name of the file group. It is assumed that `st_gid` is related to a real group, otherwise `KeyError` is raised. """ import grp return grp.getgrgid(self.stat().st_gid).gr_name if sys.version_info >= (3, 14): # in Python 3.14, case-sensitivity is checked using an is-check # (self.parser is posixpath) if not given, which we cannot fake # therefore we already provide the case sensitivity under Posix def glob(self, pattern, *, case_sensitive=None, recurse_symlinks=False): if case_sensitive is None: case_sensitive = True return super().glob( # pytype: disable=wrong-keyword-args pattern, case_sensitive=case_sensitive, recurse_symlinks=recurse_symlinks, ) Path = FakePath def __getattr__(self, name): """Forwards any unfaked calls to the standard pathlib module.""" return getattr(self.pathlib_module, name) class FakePathlibPathModule: """Patches `pathlib.Path` by passing all calls to FakePathlibModule.""" fake_pathlib = None def __init__(self, filesystem=None, from_patcher=False): if self.fake_pathlib is None: self.__class__.fake_pathlib = FakePathlibModule(filesystem, from_patcher) @property def skip_names(self): return [] # not used, here to allow a setter @skip_names.setter def skip_names(self, value): # this is set from the patcher and passed to the fake Path class self.fake_pathlib.Path.skip_names = value def __call__(self, *args, **kwargs): return self.fake_pathlib.Path(*args, **kwargs) def __getattr__(self, name): return getattr(self.fake_pathlib.Path, name) @classmethod def __instancecheck__(cls, instance): # fake the inheritance to pass isinstance checks - see #666 return isinstance(instance, PurePath) class RealPath(pathlib.Path): """Replacement for `pathlib.Path` if it shall not be faked. Needed because `Path` in `pathlib` is always faked, even if `pathlib` itself is not. """ if sys.version_info < (3, 12): _flavour = ( pathlib._WindowsFlavour() # type:ignore if os.name == "nt" else pathlib._PosixFlavour() # type:ignore ) # type:ignore elif sys.version_info < (3, 13): _flavour = ntpath if os.name == "nt" else posixpath else: parser = ntpath if os.name == "nt" else posixpath def __new__(cls, *args, **kwargs): """Creates the correct subclass based on OS.""" if cls is RealPathlibModule.Path: cls = ( RealPathlibModule.WindowsPath # pytype: disable=attribute-error if os.name == "nt" else RealPathlibModule.PosixPath # pytype: disable=attribute-error ) if sys.version_info < (3, 12): return cls._from_parts(args) # pytype: disable=attribute-error else: return object.__new__(cls) if sys.version_info > (3, 10): def with_original_os(f: Callable) -> Callable: """Decorator used for real pathlib Path methods to ensure that real os functions instead of faked ones are used.""" @functools.wraps(f) def wrapped(*args, **kwargs): with use_original_os(): return f(*args, **kwargs) return wrapped for fct_name, fn in inspect.getmembers(RealPath, inspect.isfunction): if not fct_name.startswith("__"): setattr(RealPath, fct_name, with_original_os(fn)) class RealPathlibPathModule: """Patches `pathlib.Path` by passing all calls to RealPathlibModule.""" real_pathlib = None @classmethod def __instancecheck__(cls, instance): # as we cannot derive from pathlib.Path, we fake # the inheritance to pass isinstance checks - see #666 return isinstance(instance, PurePath) def __init__(self): if self.real_pathlib is None: self.__class__.real_pathlib = RealPathlibModule() def __call__(self, *args, **kwargs): return RealPath(*args, **kwargs) def __getattr__(self, name): return getattr(self.real_pathlib.Path, name) class RealPathlibModule: """Used to replace `pathlib` for skipped modules. As the original `pathlib` is always patched to use the fake path, we need to provide a version which does not do this. """ def __init__(self): self._pathlib_module = pathlib class PurePosixPath(PurePath): """A subclass of PurePath, that represents Posix filesystem paths""" __slots__ = () class PureWindowsPath(PurePath): """A subclass of PurePath, that represents Windows filesystem paths""" __slots__ = () if sys.platform == "win32": class WindowsPath(RealPath, PureWindowsPath): """A subclass of Path and PureWindowsPath that represents concrete Windows filesystem paths. """ __slots__ = () else: class PosixPath(RealPath, PurePosixPath): """A subclass of Path and PurePosixPath that represents concrete non-Windows filesystem paths. """ __slots__ = () Path = RealPath def __getattr__(self, name): """Forwards any unfaked calls to the standard pathlib module.""" return getattr(self._pathlib_module, name)
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