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# 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 sys
from pyfakefs.extra_packages import use_scandir_package
class DirEntry(object):
"""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._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.path)
if self._filesystem.is_windows_fs:
file_object.st_nlink = 0
self._statresult_symlink = file_object.stat_result.copy()
return self._statresult_symlink
if self._statresult is None:
file_object = self._filesystem.lresolve(self.path)
self._inode = file_object.st_ino
if self._filesystem.is_windows_fs:
file_object.st_nlink = 0
self._statresult = file_object.stat_result.copy()
return self._statresult
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')
path = self.filesystem.get_open_file(path).get_object().path
self.path = self.filesystem.absnormpath(path)
contents = {}
try:
contents = self.filesystem.confirmdir(path).contents
except OSError:
pass
self.contents_iter = iter(contents)
def __iter__(self):
return self
def __next__(self):
try:
entry = self.contents_iter.next()
except AttributeError:
entry = self.contents_iter.__next__()
dir_entry = DirEntry(self.filesystem)
dir_entry.name = entry
dir_entry.path = self.filesystem.joinpaths(self.path,
dir_entry.name)
dir_entry._isdir = self.filesystem.isdir(dir_entry.path)
dir_entry._islink = self.filesystem.islink(dir_entry.path)
return dir_entry
# satisfy both Python 2 and 3
next = __next__
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):
top_dir = filesystem.normpath(top_dir)
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]:
if not followlinks and filesystem.islink(directory):
continue
for contents in do_walk(filesystem.joinpaths(top_dir,
directory)):
yield contents
if not topdown:
yield top_contents
return do_walk(top, top_most=True)
class FakeScanDirModule(object):
"""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)