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# Copyright 2009 Google Inc. All Rights Reserved.
#
# 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.
""" Faked ``os.path`` module replacement. See ``fake_filesystem`` for usage.
"""
import errno
import os
import sys
from stat import (
S_IFDIR,
S_IFMT,
)
from types import ModuleType
from typing import (
List,
Optional,
Union,
Any,
Dict,
Tuple,
AnyStr,
overload,
ClassVar,
TYPE_CHECKING,
)
from pyfakefs.helpers import (
make_string_path,
to_string,
matching_string,
)
if TYPE_CHECKING:
from pyfakefs.fake_filesystem import FakeFilesystem
from pyfakefs.fake_os import FakeOsModule
def _copy_module(old: ModuleType) -> ModuleType:
"""Recompiles and creates new module object."""
saved = sys.modules.pop(old.__name__, None)
new = __import__(old.__name__)
if saved is not None:
sys.modules[old.__name__] = saved
return new
class FakePathModule:
"""Faked os.path module replacement.
FakePathModule should *only* be instantiated by FakeOsModule. See the
FakeOsModule docstring for details.
"""
_OS_PATH_COPY: Any = _copy_module(os.path)
devnull: ClassVar[str] = ""
sep: ClassVar[str] = ""
altsep: ClassVar[Optional[str]] = None
linesep: ClassVar[str] = ""
pathsep: ClassVar[str] = ""
@staticmethod
def dir() -> List[str]:
"""Return the list of patched function names. Used for patching
functions imported from the module.
"""
dir_list = [
"abspath",
"dirname",
"exists",
"expanduser",
"getatime",
"getctime",
"getmtime",
"getsize",
"isabs",
"isdir",
"isfile",
"islink",
"ismount",
"join",
"lexists",
"normcase",
"normpath",
"realpath",
"relpath",
"split",
"splitdrive",
"samefile",
]
if sys.version_info >= (3, 12):
dir_list += ["isjunction", "splitroot"]
return dir_list
def __init__(self, filesystem: "FakeFilesystem", os_module: "FakeOsModule"):
"""Init.
Args:
filesystem: FakeFilesystem used to provide file system information
"""
self.filesystem = filesystem
self._os_path = self._OS_PATH_COPY
self._os_path.os = self.os = os_module # type: ignore[attr-defined]
self.reset(filesystem)
@classmethod
def reset(cls, filesystem: "FakeFilesystem") -> None:
cls.sep = filesystem.path_separator
cls.altsep = filesystem.alternative_path_separator
cls.linesep = filesystem.line_separator()
cls.devnull = "nul" if filesystem.is_windows_fs else "/dev/null"
cls.pathsep = ";" if filesystem.is_windows_fs else ":"
def exists(self, path: AnyStr) -> bool:
"""Determine whether the file object exists within the fake filesystem.
Args:
path: The path to the file object.
Returns:
(bool) `True` if the file exists.
"""
return self.filesystem.exists(path)
def lexists(self, path: AnyStr) -> bool:
"""Test whether a path exists. Returns True for broken symbolic links.
Args:
path: path to the symlink object.
Returns:
bool (if file exists).
"""
return self.filesystem.exists(path, check_link=True)
def getsize(self, path: AnyStr):
"""Return the file object size in bytes.
Args:
path: path to the file object.
Returns:
file size in bytes.
"""
file_obj = self.filesystem.resolve(path)
if (
self.filesystem.ends_with_path_separator(path)
and S_IFMT(file_obj.st_mode) != S_IFDIR
):
error_nr = errno.EINVAL if self.filesystem.is_windows_fs else errno.ENOTDIR
self.filesystem.raise_os_error(error_nr, path)
return file_obj.st_size
def isabs(self, path: AnyStr) -> bool:
"""Return True if path is an absolute pathname."""
if self.filesystem.is_windows_fs:
path = self.splitdrive(path)[1]
path = make_string_path(path)
return self.filesystem.starts_with_sep(path)
def isdir(self, path: AnyStr) -> bool:
"""Determine if path identifies a directory."""
return self.filesystem.isdir(path)
def isfile(self, path: AnyStr) -> bool:
"""Determine if path identifies a regular file."""
return self.filesystem.isfile(path)
def islink(self, path: AnyStr) -> bool:
"""Determine if path identifies a symbolic link.
Args:
path: Path to filesystem object.
Returns:
`True` if path points to a symbolic link.
Raises:
TypeError: if path is None.
"""
return self.filesystem.islink(path)
if sys.version_info >= (3, 12):
def isjunction(self, path: AnyStr) -> bool:
"""Returns False. Junctions are never faked."""
return self.filesystem.isjunction(path)
def splitroot(self, path: AnyStr):
"""Split a pathname into drive, root and tail.
Implementation taken from ntpath and posixpath.
"""
return self.filesystem.splitroot(path)
def getmtime(self, path: AnyStr) -> float:
"""Returns the modification time of the fake file.
Args:
path: the path to fake file.
Returns:
(int, float) the modification time of the fake file
in number of seconds since the epoch.
Raises:
OSError: if the file does not exist.
"""
try:
file_obj = self.filesystem.resolve(path)
return file_obj.st_mtime
except OSError:
self.filesystem.raise_os_error(errno.ENOENT, winerror=3)
def getatime(self, path: AnyStr) -> float:
"""Returns the last access time of the fake file.
Note: Access time is not set automatically in fake filesystem
on access.
Args:
path: the path to fake file.
Returns:
(int, float) the access time of the fake file in number of seconds
since the epoch.
Raises:
OSError: if the file does not exist.
"""
try:
file_obj = self.filesystem.resolve(path)
except OSError:
self.filesystem.raise_os_error(errno.ENOENT)
return file_obj.st_atime
def getctime(self, path: AnyStr) -> float:
"""Returns the creation time of the fake file.
Args:
path: the path to fake file.
Returns:
(int, float) the creation time of the fake file in number of
seconds since the epoch.
Raises:
OSError: if the file does not exist.
"""
try:
file_obj = self.filesystem.resolve(path)
except OSError:
self.filesystem.raise_os_error(errno.ENOENT)
return file_obj.st_ctime
def abspath(self, path: AnyStr) -> AnyStr:
"""Return the absolute version of a path."""
def getcwd():
"""Return the current working directory."""
# pylint: disable=undefined-variable
if isinstance(path, bytes):
return self.os.getcwdb()
else:
return self.os.getcwd()
path = make_string_path(path)
if not self.isabs(path):
path = self.join(getcwd(), path)
elif self.filesystem.is_windows_fs and self.filesystem.starts_with_sep(path):
cwd = getcwd()
if self.filesystem.starts_with_drive_letter(cwd):
path = self.join(cwd[:2], path)
return self.normpath(path)
def join(self, *p: AnyStr) -> AnyStr:
"""Return the completed path with a separator of the parts."""
return self.filesystem.joinpaths(*p)
def split(self, path: AnyStr) -> Tuple[AnyStr, AnyStr]:
"""Split the path into the directory and the filename of the path."""
return self.filesystem.splitpath(path)
def splitdrive(self, path: AnyStr) -> Tuple[AnyStr, AnyStr]:
"""Split the path into the drive part and the rest of the path, if
supported."""
return self.filesystem.splitdrive(path)
def normpath(self, path: AnyStr) -> AnyStr:
"""Normalize path, eliminating double slashes, etc."""
return self.filesystem.normpath(path)
def normcase(self, path: AnyStr) -> AnyStr:
"""Convert to lower case under windows, replaces additional path
separator."""
path = self.filesystem.normcase(path)
if self.filesystem.is_windows_fs:
path = path.lower()
return path
def relpath(self, path: AnyStr, start: Optional[AnyStr] = None) -> AnyStr:
"""We mostly rely on the native implementation and adapt the
path separator."""
if not path:
raise ValueError("no path specified")
path = make_string_path(path)
path = self.filesystem.replace_windows_root(path)
sep = matching_string(path, self.filesystem.path_separator)
if start is not None:
start = make_string_path(start)
else:
start = matching_string(path, self.filesystem.cwd)
start = self.filesystem.replace_windows_root(start)
system_sep = matching_string(path, self._os_path.sep)
if self.filesystem.alternative_path_separator is not None:
altsep = matching_string(path, self.filesystem.alternative_path_separator)
path = path.replace(altsep, system_sep)
start = start.replace(altsep, system_sep)
path = path.replace(sep, system_sep)
start = start.replace(sep, system_sep)
path = self._os_path.relpath(path, start)
return path.replace(system_sep, sep)
def realpath(self, filename: AnyStr, strict: Optional[bool] = None) -> AnyStr:
"""Return the canonical path of the specified filename, eliminating any
symbolic links encountered in the path.
"""
if strict is not None and sys.version_info < (3, 10):
raise TypeError("realpath() got an unexpected " "keyword argument 'strict'")
if strict:
# raises in strict mode if the file does not exist
self.filesystem.resolve(filename)
if self.filesystem.is_windows_fs:
return self.abspath(filename)
filename = make_string_path(filename)
path, ok = self._join_real_path(filename[:0], filename, {})
path = self.abspath(path)
return path
def samefile(self, path1: AnyStr, path2: AnyStr) -> bool:
"""Return whether path1 and path2 point to the same file.
Args:
path1: first file path or path object (Python >=3.6)
path2: second file path or path object (Python >=3.6)
Raises:
OSError: if one of the paths does not point to an existing
file system object.
"""
stat1 = self.filesystem.stat(path1)
stat2 = self.filesystem.stat(path2)
return stat1.st_ino == stat2.st_ino and stat1.st_dev == stat2.st_dev
@overload
def _join_real_path(
self, path: str, rest: str, seen: Dict[str, Optional[str]]
) -> Tuple[str, bool]:
...
@overload
def _join_real_path(
self, path: bytes, rest: bytes, seen: Dict[bytes, Optional[bytes]]
) -> Tuple[bytes, bool]:
...
def _join_real_path(
self, path: AnyStr, rest: AnyStr, seen: Dict[AnyStr, Optional[AnyStr]]
) -> Tuple[AnyStr, bool]:
"""Join two paths, normalizing and eliminating any symbolic links
encountered in the second path.
Taken from Python source and adapted.
"""
curdir = matching_string(path, ".")
pardir = matching_string(path, "..")
sep = self.filesystem.get_path_separator(path)
if self.isabs(rest):
rest = rest[1:]
path = sep
while rest:
name, _, rest = rest.partition(sep)
if not name or name == curdir:
# current dir
continue
if name == pardir:
# parent dir
if path:
path, name = self.filesystem.splitpath(path)
if name == pardir:
path = self.filesystem.joinpaths(path, pardir, pardir)
else:
path = pardir
continue
newpath = self.filesystem.joinpaths(path, name)
if not self.filesystem.islink(newpath):
path = newpath
continue
# Resolve the symbolic link
if newpath in seen:
# Already seen this path
seen_path = seen[newpath]
if seen_path is not None:
# use cached value
path = seen_path
continue
# The symlink is not resolved, so we must have a symlink loop.
# Return already resolved part + rest of the path unchanged.
return self.filesystem.joinpaths(newpath, rest), False
seen[newpath] = None # not resolved symlink
path, ok = self._join_real_path(
path,
matching_string(path, self.filesystem.readlink(newpath)),
seen,
)
if not ok:
return self.filesystem.joinpaths(path, rest), False
seen[newpath] = path # resolved symlink
return path, True
def dirname(self, path: AnyStr) -> AnyStr:
"""Returns the first part of the result of `split()`."""
return self.split(path)[0]
def expanduser(self, path: AnyStr) -> AnyStr:
"""Return the argument with an initial component of ~ or ~user
replaced by that user's home directory.
"""
path = self._os_path.expanduser(path)
return path.replace(
matching_string(path, self._os_path.sep),
matching_string(path, self.sep),
)
def ismount(self, path: AnyStr) -> bool:
"""Return true if the given path is a mount point.
Args:
path: Path to filesystem object to be checked
Returns:
`True` if path is a mount point added to the fake file system.
Under Windows also returns True for drive and UNC roots
(independent of their existence).
"""
if not path:
return False
path_str = to_string(make_string_path(path))
normed_path = self.filesystem.absnormpath(path_str)
sep = self.filesystem.path_separator
if self.filesystem.is_windows_fs:
path_seps: Union[Tuple[str, Optional[str]], Tuple[str]]
if self.filesystem.alternative_path_separator is not None:
path_seps = (sep, self.filesystem.alternative_path_separator)
else:
path_seps = (sep,)
drive, rest = self.filesystem.splitdrive(normed_path)
if drive and drive[:1] in path_seps:
return (not rest) or (rest in path_seps)
if rest in path_seps:
return True
for mount_point in self.filesystem.mount_points:
if to_string(normed_path).rstrip(sep) == to_string(mount_point).rstrip(sep):
return True
return False
def __getattr__(self, name: str) -> Any:
"""Forwards any non-faked calls to the real os.path."""
return getattr(self._os_path, name)
if sys.platform == "win32":
class FakeNtModule:
"""Under windows, a few function of `os.path` are taken from the `nt` module
for performance reasons. These are patched here.
"""
@staticmethod
def dir():
if sys.version_info >= (3, 12):
return ["_path_exists", "_path_isfile", "_path_isdir", "_path_islink"]
else:
return ["_isdir"]
def __init__(self, filesystem: "FakeFilesystem"):
"""Init.
Args:
filesystem: FakeFilesystem used to provide file system information
"""
import nt # type:ignore[import]
self.filesystem = filesystem
self.nt_module: Any = nt
if sys.version_info >= (3, 12):
def _path_isdir(self, path: AnyStr) -> bool:
return self.filesystem.isdir(path)
def _path_isfile(self, path: AnyStr) -> bool:
return self.filesystem.isfile(path)
def _path_islink(self, path: AnyStr) -> bool:
return self.filesystem.islink(path)
def _path_exists(self, path: AnyStr) -> bool:
return self.filesystem.exists(path)
else:
def _isdir(self, path: AnyStr) -> bool:
return self.filesystem.isdir(path)
def __getattr__(self, name: str) -> Any:
"""Forwards any non-faked calls to the real nt module."""
return getattr(self.nt_module, name)
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