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fake_scandir.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 the `scandir` function working with FakeFilesystem. Works with both the function integrated into the `os` module since Python 3.5 and the standalone function available in the standalone `scandir` python package. """ import os import sys from pyfakefs.extra_packages import use_scandir_package from pyfakefs.helpers import to_string, make_string_path if sys.version_info >= (3, 6): BaseClass = os.PathLike else: BaseClass = object class DirEntry(BaseClass): """Emulates os.DirEntry. Note that we did not enforce keyword only arguments.""" def __init__(self, filesystem): """Initialize the dir entry with unset values. Args: filesystem: the fake filesystem used for implementation. """ self._filesystem = filesystem self.name = "" self.path = "" self._abspath = "" self._inode = None self._islink = False self._isdir = False self._statresult = None self._statresult_symlink = None def inode(self): """Return the inode number of the entry.""" if self._inode is None: self.stat(follow_symlinks=False) return self._inode def is_dir(self, follow_symlinks=True): """Return True if this entry is a directory entry. Args: follow_symlinks: If True, also return True if this entry is a symlink pointing to a directory. Returns: True if this entry is an existing directory entry, or if follow_symlinks is set, and this entry points to an existing directory entry. """ return self._isdir and (follow_symlinks or not self._islink) def is_file(self, follow_symlinks=True): """Return True if this entry is a regular file entry. Args: follow_symlinks: If True, also return True if this entry is a symlink pointing to a regular file. Returns: True if this entry is an existing file entry, or if follow_symlinks is set, and this entry points to an existing file entry. """ return not self._isdir and (follow_symlinks or not self._islink) def is_symlink(self): """Return True if this entry is a symbolic link (even if broken).""" return self._islink def stat(self, follow_symlinks=True): """Return a stat_result object for this entry. Args: follow_symlinks: If False and the entry is a symlink, return the result for the symlink, otherwise for the object it points to. """ if follow_symlinks: if self._statresult_symlink is None: file_object = self._filesystem.resolve(self._abspath) self._statresult_symlink = file_object.stat_result.copy() if self._filesystem.is_windows_fs: self._statresult_symlink.st_nlink = 0 return self._statresult_symlink if self._statresult is None: file_object = self._filesystem.lresolve(self._abspath) self._inode = file_object.st_ino self._statresult = file_object.stat_result.copy() if self._filesystem.is_windows_fs: self._statresult.st_nlink = 0 return self._statresult if sys.version_info >= (3, 6): def __fspath__(self): return self.path if sys.version_info >= (3, 12): def is_junction(self) -> bool: """Return True if this entry is a junction. Junctions are not a part of posix semantic.""" if not self._filesystem.is_windows_fs: return False file_object = self._filesystem.resolve(self._abspath) return file_object.is_junction class ScanDirIter: """Iterator for DirEntry objects returned from `scandir()` function.""" def __init__(self, filesystem, path): self.filesystem = filesystem if isinstance(path, int): if not use_scandir_package and ( sys.version_info < (3, 7) or self.filesystem.is_windows_fs ): raise NotImplementedError( "scandir does not support file descriptor " "path argument" ) self.abspath = self.filesystem.absnormpath( self.filesystem.get_open_file(path).get_object().path ) self.path = "" else: path = make_string_path(path) self.abspath = self.filesystem.absnormpath(path) self.path = to_string(path) entries = self.filesystem.confirmdir(self.abspath).entries self.entry_iter = iter(entries) def __iter__(self): return self def __next__(self): entry = self.entry_iter.__next__() dir_entry = DirEntry(self.filesystem) dir_entry.name = entry dir_entry.path = self.filesystem.joinpaths(self.path, dir_entry.name) dir_entry._abspath = self.filesystem.joinpaths(self.abspath, dir_entry.name) dir_entry._isdir = self.filesystem.isdir(dir_entry._abspath) dir_entry._islink = self.filesystem.islink(dir_entry._abspath) return dir_entry if sys.version_info >= (3, 6): def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.close() def close(self): pass def scandir(filesystem, path=""): """Return an iterator of DirEntry objects corresponding to the entries in the directory given by path. Args: filesystem: The fake filesystem used for implementation path: Path to the target directory within the fake filesystem. Returns: an iterator to an unsorted list of os.DirEntry objects for each entry in path. Raises: OSError: if the target is not a directory. """ return ScanDirIter(filesystem, path) def _classify_directory_contents(filesystem, root): """Classify contents of a directory as files/directories. Args: filesystem: The fake filesystem used for implementation root: (str) Directory to examine. Returns: (tuple) A tuple consisting of three values: the directory examined, a list containing all of the directory entries, and a list containing all of the non-directory entries. (This is the same format as returned by the `os.walk` generator.) Raises: Nothing on its own, but be ready to catch exceptions generated by underlying mechanisms like `os.listdir`. """ dirs = [] files = [] for entry in filesystem.listdir(root): if filesystem.isdir(filesystem.joinpaths(root, entry)): dirs.append(entry) else: files.append(entry) return root, dirs, files def walk(filesystem, top, topdown=True, onerror=None, followlinks=False): """Perform an os.walk operation over the fake filesystem. Args: filesystem: The fake filesystem used for implementation top: The root directory from which to begin walk. topdown: Determines whether to return the tuples with the root as the first entry (`True`) or as the last, after all the child directory tuples (`False`). onerror: If not `None`, function which will be called to handle the `os.error` instance provided when `os.listdir()` fails. followlinks: If `True`, symbolic links are followed. Yields: (path, directories, nondirectories) for top and each of its subdirectories. See the documentation for the builtin os module for further details. """ def do_walk(top_dir, top_most=False): if not top_most and not followlinks and filesystem.islink(top_dir): return try: top_contents = _classify_directory_contents(filesystem, top_dir) except OSError as exc: top_contents = None if onerror is not None: onerror(exc) if top_contents is not None: if topdown: yield top_contents for directory in top_contents[1]: path = filesystem.joinpaths(top_dir, directory) if not followlinks and filesystem.islink(path): continue for contents in do_walk(path): yield contents if not topdown: yield top_contents return do_walk(to_string(top), top_most=True) class FakeScanDirModule: """Uses FakeFilesystem to provide a fake `scandir` module replacement. .. Note:: The ``scandir`` function is a part of the standard ``os`` module since Python 3.5. This class handles the separate ``scandir`` module that is available on pypi. You need a fake_filesystem to use this: `filesystem = fake_filesystem.FakeFilesystem()` `fake_scandir_module = fake_filesystem.FakeScanDirModule(filesystem)` """ @staticmethod def dir(): """Return the list of patched function names. Used for patching functions imported from the module. """ return "scandir", "walk" def __init__(self, filesystem): self.filesystem = filesystem def scandir(self, path="."): """Return an iterator of DirEntry objects corresponding to the entries in the directory given by path. Args: path: Path to the target directory within the fake filesystem. Returns: an iterator to an unsorted list of os.DirEntry objects for each entry in path. Raises: OSError: if the target is not a directory. """ return scandir(self.filesystem, path) def walk(self, top, topdown=True, onerror=None, followlinks=False): """Perform a walk operation over the fake filesystem. Args: top: The root directory from which to begin walk. topdown: Determines whether to return the tuples with the root as the first entry (`True`) or as the last, after all the child directory tuples (`False`). onerror: If not `None`, function which will be called to handle the `os.error` instance provided when `os.listdir()` fails. followlinks: If `True`, symbolic links are followed. Yields: (path, directories, nondirectories) for top and each of its subdirectories. See the documentation for the builtin os module for further details. """ return walk(self.filesystem, top, topdown, onerror, followlinks)
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