624 lines
20 KiB
Python
624 lines
20 KiB
Python
import collections.abc
|
|
import contextlib
|
|
import errno
|
|
import os
|
|
import re
|
|
import stat
|
|
import sys
|
|
import time
|
|
import unittest
|
|
import warnings
|
|
|
|
|
|
# Filename used for testing
|
|
if os.name == 'java':
|
|
# Jython disallows @ in module names
|
|
TESTFN_ASCII = '$test'
|
|
else:
|
|
TESTFN_ASCII = '@test'
|
|
|
|
# Disambiguate TESTFN for parallel testing, while letting it remain a valid
|
|
# module name.
|
|
TESTFN_ASCII = "{}_{}_tmp".format(TESTFN_ASCII, os.getpid())
|
|
|
|
# TESTFN_UNICODE is a non-ascii filename
|
|
TESTFN_UNICODE = TESTFN_ASCII + "-\xe0\xf2\u0258\u0141\u011f"
|
|
if sys.platform == 'darwin':
|
|
# In Mac OS X's VFS API file names are, by definition, canonically
|
|
# decomposed Unicode, encoded using UTF-8. See QA1173:
|
|
# http://developer.apple.com/mac/library/qa/qa2001/qa1173.html
|
|
import unicodedata
|
|
TESTFN_UNICODE = unicodedata.normalize('NFD', TESTFN_UNICODE)
|
|
|
|
# TESTFN_UNENCODABLE is a filename (str type) that should *not* be able to be
|
|
# encoded by the filesystem encoding (in strict mode). It can be None if we
|
|
# cannot generate such filename.
|
|
TESTFN_UNENCODABLE = None
|
|
if os.name == 'nt':
|
|
# skip win32s (0) or Windows 9x/ME (1)
|
|
if sys.getwindowsversion().platform >= 2:
|
|
# Different kinds of characters from various languages to minimize the
|
|
# probability that the whole name is encodable to MBCS (issue #9819)
|
|
TESTFN_UNENCODABLE = TESTFN_ASCII + "-\u5171\u0141\u2661\u0363\uDC80"
|
|
try:
|
|
TESTFN_UNENCODABLE.encode(sys.getfilesystemencoding())
|
|
except UnicodeEncodeError:
|
|
pass
|
|
else:
|
|
print('WARNING: The filename %r CAN be encoded by the filesystem '
|
|
'encoding (%s). Unicode filename tests may not be effective'
|
|
% (TESTFN_UNENCODABLE, sys.getfilesystemencoding()))
|
|
TESTFN_UNENCODABLE = None
|
|
# Mac OS X denies unencodable filenames (invalid utf-8)
|
|
elif sys.platform != 'darwin':
|
|
try:
|
|
# ascii and utf-8 cannot encode the byte 0xff
|
|
b'\xff'.decode(sys.getfilesystemencoding())
|
|
except UnicodeDecodeError:
|
|
# 0xff will be encoded using the surrogate character u+DCFF
|
|
TESTFN_UNENCODABLE = TESTFN_ASCII \
|
|
+ b'-\xff'.decode(sys.getfilesystemencoding(), 'surrogateescape')
|
|
else:
|
|
# File system encoding (eg. ISO-8859-* encodings) can encode
|
|
# the byte 0xff. Skip some unicode filename tests.
|
|
pass
|
|
|
|
# FS_NONASCII: non-ASCII character encodable by os.fsencode(),
|
|
# or an empty string if there is no such character.
|
|
FS_NONASCII = ''
|
|
for character in (
|
|
# First try printable and common characters to have a readable filename.
|
|
# For each character, the encoding list are just example of encodings able
|
|
# to encode the character (the list is not exhaustive).
|
|
|
|
# U+00E6 (Latin Small Letter Ae): cp1252, iso-8859-1
|
|
'\u00E6',
|
|
# U+0130 (Latin Capital Letter I With Dot Above): cp1254, iso8859_3
|
|
'\u0130',
|
|
# U+0141 (Latin Capital Letter L With Stroke): cp1250, cp1257
|
|
'\u0141',
|
|
# U+03C6 (Greek Small Letter Phi): cp1253
|
|
'\u03C6',
|
|
# U+041A (Cyrillic Capital Letter Ka): cp1251
|
|
'\u041A',
|
|
# U+05D0 (Hebrew Letter Alef): Encodable to cp424
|
|
'\u05D0',
|
|
# U+060C (Arabic Comma): cp864, cp1006, iso8859_6, mac_arabic
|
|
'\u060C',
|
|
# U+062A (Arabic Letter Teh): cp720
|
|
'\u062A',
|
|
# U+0E01 (Thai Character Ko Kai): cp874
|
|
'\u0E01',
|
|
|
|
# Then try more "special" characters. "special" because they may be
|
|
# interpreted or displayed differently depending on the exact locale
|
|
# encoding and the font.
|
|
|
|
# U+00A0 (No-Break Space)
|
|
'\u00A0',
|
|
# U+20AC (Euro Sign)
|
|
'\u20AC',
|
|
):
|
|
try:
|
|
# If Python is set up to use the legacy 'mbcs' in Windows,
|
|
# 'replace' error mode is used, and encode() returns b'?'
|
|
# for characters missing in the ANSI codepage
|
|
if os.fsdecode(os.fsencode(character)) != character:
|
|
raise UnicodeError
|
|
except UnicodeError:
|
|
pass
|
|
else:
|
|
FS_NONASCII = character
|
|
break
|
|
|
|
# Save the initial cwd
|
|
SAVEDCWD = os.getcwd()
|
|
|
|
# TESTFN_UNDECODABLE is a filename (bytes type) that should *not* be able to be
|
|
# decoded from the filesystem encoding (in strict mode). It can be None if we
|
|
# cannot generate such filename (ex: the latin1 encoding can decode any byte
|
|
# sequence). On UNIX, TESTFN_UNDECODABLE can be decoded by os.fsdecode() thanks
|
|
# to the surrogateescape error handler (PEP 383), but not from the filesystem
|
|
# encoding in strict mode.
|
|
TESTFN_UNDECODABLE = None
|
|
for name in (
|
|
# b'\xff' is not decodable by os.fsdecode() with code page 932. Windows
|
|
# accepts it to create a file or a directory, or don't accept to enter to
|
|
# such directory (when the bytes name is used). So test b'\xe7' first:
|
|
# it is not decodable from cp932.
|
|
b'\xe7w\xf0',
|
|
# undecodable from ASCII, UTF-8
|
|
b'\xff',
|
|
# undecodable from iso8859-3, iso8859-6, iso8859-7, cp424, iso8859-8, cp856
|
|
# and cp857
|
|
b'\xae\xd5'
|
|
# undecodable from UTF-8 (UNIX and Mac OS X)
|
|
b'\xed\xb2\x80', b'\xed\xb4\x80',
|
|
# undecodable from shift_jis, cp869, cp874, cp932, cp1250, cp1251, cp1252,
|
|
# cp1253, cp1254, cp1255, cp1257, cp1258
|
|
b'\x81\x98',
|
|
):
|
|
try:
|
|
name.decode(sys.getfilesystemencoding())
|
|
except UnicodeDecodeError:
|
|
TESTFN_UNDECODABLE = os.fsencode(TESTFN_ASCII) + name
|
|
break
|
|
|
|
if FS_NONASCII:
|
|
TESTFN_NONASCII = TESTFN_ASCII + FS_NONASCII
|
|
else:
|
|
TESTFN_NONASCII = None
|
|
TESTFN = TESTFN_NONASCII or TESTFN_ASCII
|
|
|
|
|
|
def make_bad_fd():
|
|
"""
|
|
Create an invalid file descriptor by opening and closing a file and return
|
|
its fd.
|
|
"""
|
|
file = open(TESTFN, "wb")
|
|
try:
|
|
return file.fileno()
|
|
finally:
|
|
file.close()
|
|
unlink(TESTFN)
|
|
|
|
|
|
_can_symlink = None
|
|
|
|
|
|
def can_symlink():
|
|
global _can_symlink
|
|
if _can_symlink is not None:
|
|
return _can_symlink
|
|
symlink_path = TESTFN + "can_symlink"
|
|
try:
|
|
os.symlink(TESTFN, symlink_path)
|
|
can = True
|
|
except (OSError, NotImplementedError, AttributeError):
|
|
can = False
|
|
else:
|
|
os.remove(symlink_path)
|
|
_can_symlink = can
|
|
return can
|
|
|
|
|
|
def skip_unless_symlink(test):
|
|
"""Skip decorator for tests that require functional symlink"""
|
|
ok = can_symlink()
|
|
msg = "Requires functional symlink implementation"
|
|
return test if ok else unittest.skip(msg)(test)
|
|
|
|
|
|
_can_xattr = None
|
|
|
|
|
|
def can_xattr():
|
|
import tempfile
|
|
global _can_xattr
|
|
if _can_xattr is not None:
|
|
return _can_xattr
|
|
if not hasattr(os, "setxattr"):
|
|
can = False
|
|
else:
|
|
import platform
|
|
tmp_dir = tempfile.mkdtemp()
|
|
tmp_fp, tmp_name = tempfile.mkstemp(dir=tmp_dir)
|
|
try:
|
|
with open(TESTFN, "wb") as fp:
|
|
try:
|
|
# TESTFN & tempfile may use different file systems with
|
|
# different capabilities
|
|
os.setxattr(tmp_fp, b"user.test", b"")
|
|
os.setxattr(tmp_name, b"trusted.foo", b"42")
|
|
os.setxattr(fp.fileno(), b"user.test", b"")
|
|
# Kernels < 2.6.39 don't respect setxattr flags.
|
|
kernel_version = platform.release()
|
|
m = re.match(r"2.6.(\d{1,2})", kernel_version)
|
|
can = m is None or int(m.group(1)) >= 39
|
|
except OSError:
|
|
can = False
|
|
finally:
|
|
unlink(TESTFN)
|
|
unlink(tmp_name)
|
|
rmdir(tmp_dir)
|
|
_can_xattr = can
|
|
return can
|
|
|
|
|
|
def skip_unless_xattr(test):
|
|
"""Skip decorator for tests that require functional extended attributes"""
|
|
ok = can_xattr()
|
|
msg = "no non-broken extended attribute support"
|
|
return test if ok else unittest.skip(msg)(test)
|
|
|
|
|
|
def unlink(filename):
|
|
try:
|
|
_unlink(filename)
|
|
except (FileNotFoundError, NotADirectoryError):
|
|
pass
|
|
|
|
|
|
if sys.platform.startswith("win"):
|
|
def _waitfor(func, pathname, waitall=False):
|
|
# Perform the operation
|
|
func(pathname)
|
|
# Now setup the wait loop
|
|
if waitall:
|
|
dirname = pathname
|
|
else:
|
|
dirname, name = os.path.split(pathname)
|
|
dirname = dirname or '.'
|
|
# Check for `pathname` to be removed from the filesystem.
|
|
# The exponential backoff of the timeout amounts to a total
|
|
# of ~1 second after which the deletion is probably an error
|
|
# anyway.
|
|
# Testing on an i7@4.3GHz shows that usually only 1 iteration is
|
|
# required when contention occurs.
|
|
timeout = 0.001
|
|
while timeout < 1.0:
|
|
# Note we are only testing for the existence of the file(s) in
|
|
# the contents of the directory regardless of any security or
|
|
# access rights. If we have made it this far, we have sufficient
|
|
# permissions to do that much using Python's equivalent of the
|
|
# Windows API FindFirstFile.
|
|
# Other Windows APIs can fail or give incorrect results when
|
|
# dealing with files that are pending deletion.
|
|
L = os.listdir(dirname)
|
|
if not (L if waitall else name in L):
|
|
return
|
|
# Increase the timeout and try again
|
|
time.sleep(timeout)
|
|
timeout *= 2
|
|
warnings.warn('tests may fail, delete still pending for ' + pathname,
|
|
RuntimeWarning, stacklevel=4)
|
|
|
|
def _unlink(filename):
|
|
_waitfor(os.unlink, filename)
|
|
|
|
def _rmdir(dirname):
|
|
_waitfor(os.rmdir, dirname)
|
|
|
|
def _rmtree(path):
|
|
from test.support import _force_run
|
|
|
|
def _rmtree_inner(path):
|
|
for name in _force_run(path, os.listdir, path):
|
|
fullname = os.path.join(path, name)
|
|
try:
|
|
mode = os.lstat(fullname).st_mode
|
|
except OSError as exc:
|
|
print("support.rmtree(): os.lstat(%r) failed with %s"
|
|
% (fullname, exc),
|
|
file=sys.__stderr__)
|
|
mode = 0
|
|
if stat.S_ISDIR(mode):
|
|
_waitfor(_rmtree_inner, fullname, waitall=True)
|
|
_force_run(fullname, os.rmdir, fullname)
|
|
else:
|
|
_force_run(fullname, os.unlink, fullname)
|
|
_waitfor(_rmtree_inner, path, waitall=True)
|
|
_waitfor(lambda p: _force_run(p, os.rmdir, p), path)
|
|
|
|
def _longpath(path):
|
|
try:
|
|
import ctypes
|
|
except ImportError:
|
|
# No ctypes means we can't expands paths.
|
|
pass
|
|
else:
|
|
buffer = ctypes.create_unicode_buffer(len(path) * 2)
|
|
length = ctypes.windll.kernel32.GetLongPathNameW(path, buffer,
|
|
len(buffer))
|
|
if length:
|
|
return buffer[:length]
|
|
return path
|
|
else:
|
|
_unlink = os.unlink
|
|
_rmdir = os.rmdir
|
|
|
|
def _rmtree(path):
|
|
import shutil
|
|
try:
|
|
shutil.rmtree(path)
|
|
return
|
|
except OSError:
|
|
pass
|
|
|
|
def _rmtree_inner(path):
|
|
from test.support import _force_run
|
|
for name in _force_run(path, os.listdir, path):
|
|
fullname = os.path.join(path, name)
|
|
try:
|
|
mode = os.lstat(fullname).st_mode
|
|
except OSError:
|
|
mode = 0
|
|
if stat.S_ISDIR(mode):
|
|
_rmtree_inner(fullname)
|
|
_force_run(path, os.rmdir, fullname)
|
|
else:
|
|
_force_run(path, os.unlink, fullname)
|
|
_rmtree_inner(path)
|
|
os.rmdir(path)
|
|
|
|
def _longpath(path):
|
|
return path
|
|
|
|
|
|
def rmdir(dirname):
|
|
try:
|
|
_rmdir(dirname)
|
|
except FileNotFoundError:
|
|
pass
|
|
|
|
|
|
def rmtree(path):
|
|
try:
|
|
_rmtree(path)
|
|
except FileNotFoundError:
|
|
pass
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def temp_dir(path=None, quiet=False):
|
|
"""Return a context manager that creates a temporary directory.
|
|
|
|
Arguments:
|
|
|
|
path: the directory to create temporarily. If omitted or None,
|
|
defaults to creating a temporary directory using tempfile.mkdtemp.
|
|
|
|
quiet: if False (the default), the context manager raises an exception
|
|
on error. Otherwise, if the path is specified and cannot be
|
|
created, only a warning is issued.
|
|
|
|
"""
|
|
import tempfile
|
|
dir_created = False
|
|
if path is None:
|
|
path = tempfile.mkdtemp()
|
|
dir_created = True
|
|
path = os.path.realpath(path)
|
|
else:
|
|
try:
|
|
os.mkdir(path)
|
|
dir_created = True
|
|
except OSError as exc:
|
|
if not quiet:
|
|
raise
|
|
warnings.warn(f'tests may fail, unable to create '
|
|
f'temporary directory {path!r}: {exc}',
|
|
RuntimeWarning, stacklevel=3)
|
|
if dir_created:
|
|
pid = os.getpid()
|
|
try:
|
|
yield path
|
|
finally:
|
|
# In case the process forks, let only the parent remove the
|
|
# directory. The child has a different process id. (bpo-30028)
|
|
if dir_created and pid == os.getpid():
|
|
rmtree(path)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def change_cwd(path, quiet=False):
|
|
"""Return a context manager that changes the current working directory.
|
|
|
|
Arguments:
|
|
|
|
path: the directory to use as the temporary current working directory.
|
|
|
|
quiet: if False (the default), the context manager raises an exception
|
|
on error. Otherwise, it issues only a warning and keeps the current
|
|
working directory the same.
|
|
|
|
"""
|
|
saved_dir = os.getcwd()
|
|
try:
|
|
os.chdir(os.path.realpath(path))
|
|
except OSError as exc:
|
|
if not quiet:
|
|
raise
|
|
warnings.warn(f'tests may fail, unable to change the current working '
|
|
f'directory to {path!r}: {exc}',
|
|
RuntimeWarning, stacklevel=3)
|
|
try:
|
|
yield os.getcwd()
|
|
finally:
|
|
os.chdir(saved_dir)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def temp_cwd(name='tempcwd', quiet=False):
|
|
"""
|
|
Context manager that temporarily creates and changes the CWD.
|
|
|
|
The function temporarily changes the current working directory
|
|
after creating a temporary directory in the current directory with
|
|
name *name*. If *name* is None, the temporary directory is
|
|
created using tempfile.mkdtemp.
|
|
|
|
If *quiet* is False (default) and it is not possible to
|
|
create or change the CWD, an error is raised. If *quiet* is True,
|
|
only a warning is raised and the original CWD is used.
|
|
|
|
"""
|
|
with temp_dir(path=name, quiet=quiet) as temp_path:
|
|
with change_cwd(temp_path, quiet=quiet) as cwd_dir:
|
|
yield cwd_dir
|
|
|
|
|
|
def create_empty_file(filename):
|
|
"""Create an empty file. If the file already exists, truncate it."""
|
|
fd = os.open(filename, os.O_WRONLY | os.O_CREAT | os.O_TRUNC)
|
|
os.close(fd)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def open_dir_fd(path):
|
|
"""Open a file descriptor to a directory."""
|
|
assert os.path.isdir(path)
|
|
dir_fd = os.open(path, os.O_RDONLY)
|
|
try:
|
|
yield dir_fd
|
|
finally:
|
|
os.close(dir_fd)
|
|
|
|
|
|
def fs_is_case_insensitive(directory):
|
|
"""Detects if the file system for the specified directory
|
|
is case-insensitive."""
|
|
import tempfile
|
|
with tempfile.NamedTemporaryFile(dir=directory) as base:
|
|
base_path = base.name
|
|
case_path = base_path.upper()
|
|
if case_path == base_path:
|
|
case_path = base_path.lower()
|
|
try:
|
|
return os.path.samefile(base_path, case_path)
|
|
except FileNotFoundError:
|
|
return False
|
|
|
|
|
|
class FakePath:
|
|
"""Simple implementing of the path protocol.
|
|
"""
|
|
def __init__(self, path):
|
|
self.path = path
|
|
|
|
def __repr__(self):
|
|
return f'<FakePath {self.path!r}>'
|
|
|
|
def __fspath__(self):
|
|
if (isinstance(self.path, BaseException) or
|
|
isinstance(self.path, type) and
|
|
issubclass(self.path, BaseException)):
|
|
raise self.path
|
|
else:
|
|
return self.path
|
|
|
|
|
|
def fd_count():
|
|
"""Count the number of open file descriptors.
|
|
"""
|
|
if sys.platform.startswith(('linux', 'freebsd')):
|
|
try:
|
|
names = os.listdir("/proc/self/fd")
|
|
# Subtract one because listdir() internally opens a file
|
|
# descriptor to list the content of the /proc/self/fd/ directory.
|
|
return len(names) - 1
|
|
except FileNotFoundError:
|
|
pass
|
|
|
|
MAXFD = 256
|
|
if hasattr(os, 'sysconf'):
|
|
try:
|
|
MAXFD = os.sysconf("SC_OPEN_MAX")
|
|
except OSError:
|
|
pass
|
|
|
|
old_modes = None
|
|
if sys.platform == 'win32':
|
|
# bpo-25306, bpo-31009: Call CrtSetReportMode() to not kill the process
|
|
# on invalid file descriptor if Python is compiled in debug mode
|
|
try:
|
|
import msvcrt
|
|
msvcrt.CrtSetReportMode
|
|
except (AttributeError, ImportError):
|
|
# no msvcrt or a release build
|
|
pass
|
|
else:
|
|
old_modes = {}
|
|
for report_type in (msvcrt.CRT_WARN,
|
|
msvcrt.CRT_ERROR,
|
|
msvcrt.CRT_ASSERT):
|
|
old_modes[report_type] = msvcrt.CrtSetReportMode(report_type,
|
|
0)
|
|
|
|
try:
|
|
count = 0
|
|
for fd in range(MAXFD):
|
|
try:
|
|
# Prefer dup() over fstat(). fstat() can require input/output
|
|
# whereas dup() doesn't.
|
|
fd2 = os.dup(fd)
|
|
except OSError as e:
|
|
if e.errno != errno.EBADF:
|
|
raise
|
|
else:
|
|
os.close(fd2)
|
|
count += 1
|
|
finally:
|
|
if old_modes is not None:
|
|
for report_type in (msvcrt.CRT_WARN,
|
|
msvcrt.CRT_ERROR,
|
|
msvcrt.CRT_ASSERT):
|
|
msvcrt.CrtSetReportMode(report_type, old_modes[report_type])
|
|
|
|
return count
|
|
|
|
|
|
if hasattr(os, "umask"):
|
|
@contextlib.contextmanager
|
|
def temp_umask(umask):
|
|
"""Context manager that temporarily sets the process umask."""
|
|
oldmask = os.umask(umask)
|
|
try:
|
|
yield
|
|
finally:
|
|
os.umask(oldmask)
|
|
|
|
|
|
class EnvironmentVarGuard(collections.abc.MutableMapping):
|
|
|
|
"""Class to help protect the environment variable properly. Can be used as
|
|
a context manager."""
|
|
|
|
def __init__(self):
|
|
self._environ = os.environ
|
|
self._changed = {}
|
|
|
|
def __getitem__(self, envvar):
|
|
return self._environ[envvar]
|
|
|
|
def __setitem__(self, envvar, value):
|
|
# Remember the initial value on the first access
|
|
if envvar not in self._changed:
|
|
self._changed[envvar] = self._environ.get(envvar)
|
|
self._environ[envvar] = value
|
|
|
|
def __delitem__(self, envvar):
|
|
# Remember the initial value on the first access
|
|
if envvar not in self._changed:
|
|
self._changed[envvar] = self._environ.get(envvar)
|
|
if envvar in self._environ:
|
|
del self._environ[envvar]
|
|
|
|
def keys(self):
|
|
return self._environ.keys()
|
|
|
|
def __iter__(self):
|
|
return iter(self._environ)
|
|
|
|
def __len__(self):
|
|
return len(self._environ)
|
|
|
|
def set(self, envvar, value):
|
|
self[envvar] = value
|
|
|
|
def unset(self, envvar):
|
|
del self[envvar]
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, *ignore_exc):
|
|
for (k, v) in self._changed.items():
|
|
if v is None:
|
|
if k in self._environ:
|
|
del self._environ[k]
|
|
else:
|
|
self._environ[k] = v
|
|
os.environ = self._environ
|