mirror of
https://github.com/python/cpython
synced 2024-09-05 00:05:39 +00:00
911 lines
29 KiB
Python
911 lines
29 KiB
Python
"""Temporary files.
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This module provides generic, low- and high-level interfaces for
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creating temporary files and directories. All of the interfaces
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provided by this module can be used without fear of race conditions
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except for 'mktemp'. 'mktemp' is subject to race conditions and
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should not be used; it is provided for backward compatibility only.
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The default path names are returned as str. If you supply bytes as
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input, all return values will be in bytes. Ex:
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>>> tempfile.mkstemp()
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(4, '/tmp/tmptpu9nin8')
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>>> tempfile.mkdtemp(suffix=b'')
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b'/tmp/tmppbi8f0hy'
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This module also provides some data items to the user:
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TMP_MAX - maximum number of names that will be tried before
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giving up.
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tempdir - If this is set to a string before the first use of
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any routine from this module, it will be considered as
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another candidate location to store temporary files.
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"""
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__all__ = [
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"NamedTemporaryFile", "TemporaryFile", # high level safe interfaces
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"SpooledTemporaryFile", "TemporaryDirectory",
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"mkstemp", "mkdtemp", # low level safe interfaces
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"mktemp", # deprecated unsafe interface
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"TMP_MAX", "gettempprefix", # constants
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"tempdir", "gettempdir",
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"gettempprefixb", "gettempdirb",
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]
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# Imports.
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import functools as _functools
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import warnings as _warnings
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import io as _io
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import os as _os
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import shutil as _shutil
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import errno as _errno
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from random import Random as _Random
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import sys as _sys
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import types as _types
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import weakref as _weakref
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import _thread
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_allocate_lock = _thread.allocate_lock
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_text_openflags = _os.O_RDWR | _os.O_CREAT | _os.O_EXCL
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if hasattr(_os, 'O_NOFOLLOW'):
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_text_openflags |= _os.O_NOFOLLOW
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_bin_openflags = _text_openflags
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if hasattr(_os, 'O_BINARY'):
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_bin_openflags |= _os.O_BINARY
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if hasattr(_os, 'TMP_MAX'):
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TMP_MAX = _os.TMP_MAX
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else:
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TMP_MAX = 10000
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# This variable _was_ unused for legacy reasons, see issue 10354.
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# But as of 3.5 we actually use it at runtime so changing it would
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# have a possibly desirable side effect... But we do not want to support
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# that as an API. It is undocumented on purpose. Do not depend on this.
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template = "tmp"
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# Internal routines.
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_once_lock = _allocate_lock()
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def _exists(fn):
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try:
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_os.lstat(fn)
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except OSError:
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return False
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else:
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return True
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def _infer_return_type(*args):
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"""Look at the type of all args and divine their implied return type."""
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return_type = None
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for arg in args:
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if arg is None:
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continue
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if isinstance(arg, _os.PathLike):
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arg = _os.fspath(arg)
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if isinstance(arg, bytes):
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if return_type is str:
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raise TypeError("Can't mix bytes and non-bytes in "
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"path components.")
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return_type = bytes
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else:
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if return_type is bytes:
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raise TypeError("Can't mix bytes and non-bytes in "
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"path components.")
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return_type = str
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if return_type is None:
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if tempdir is None or isinstance(tempdir, str):
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return str # tempfile APIs return a str by default.
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else:
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# we could check for bytes but it'll fail later on anyway
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return bytes
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return return_type
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def _sanitize_params(prefix, suffix, dir):
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"""Common parameter processing for most APIs in this module."""
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output_type = _infer_return_type(prefix, suffix, dir)
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if suffix is None:
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suffix = output_type()
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if prefix is None:
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if output_type is str:
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prefix = template
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else:
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prefix = _os.fsencode(template)
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if dir is None:
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if output_type is str:
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dir = gettempdir()
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else:
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dir = gettempdirb()
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return prefix, suffix, dir, output_type
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class _RandomNameSequence:
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"""An instance of _RandomNameSequence generates an endless
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sequence of unpredictable strings which can safely be incorporated
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into file names. Each string is eight characters long. Multiple
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threads can safely use the same instance at the same time.
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_RandomNameSequence is an iterator."""
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characters = "abcdefghijklmnopqrstuvwxyz0123456789_"
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@property
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def rng(self):
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cur_pid = _os.getpid()
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if cur_pid != getattr(self, '_rng_pid', None):
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self._rng = _Random()
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self._rng_pid = cur_pid
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return self._rng
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def __iter__(self):
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return self
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def __next__(self):
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return ''.join(self.rng.choices(self.characters, k=8))
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def _candidate_tempdir_list():
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"""Generate a list of candidate temporary directories which
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_get_default_tempdir will try."""
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dirlist = []
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# First, try the environment.
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for envname in 'TMPDIR', 'TEMP', 'TMP':
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dirname = _os.getenv(envname)
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if dirname: dirlist.append(dirname)
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# Failing that, try OS-specific locations.
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if _os.name == 'nt':
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dirlist.extend([ _os.path.expanduser(r'~\AppData\Local\Temp'),
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_os.path.expandvars(r'%SYSTEMROOT%\Temp'),
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r'c:\temp', r'c:\tmp', r'\temp', r'\tmp' ])
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else:
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dirlist.extend([ '/tmp', '/var/tmp', '/usr/tmp' ])
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# As a last resort, the current directory.
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try:
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dirlist.append(_os.getcwd())
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except (AttributeError, OSError):
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dirlist.append(_os.curdir)
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return dirlist
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def _get_default_tempdir():
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"""Calculate the default directory to use for temporary files.
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This routine should be called exactly once.
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We determine whether or not a candidate temp dir is usable by
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trying to create and write to a file in that directory. If this
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is successful, the test file is deleted. To prevent denial of
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service, the name of the test file must be randomized."""
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namer = _RandomNameSequence()
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dirlist = _candidate_tempdir_list()
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for dir in dirlist:
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if dir != _os.curdir:
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dir = _os.path.abspath(dir)
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# Try only a few names per directory.
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for seq in range(100):
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name = next(namer)
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filename = _os.path.join(dir, name)
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try:
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fd = _os.open(filename, _bin_openflags, 0o600)
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try:
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try:
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_os.write(fd, b'blat')
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finally:
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_os.close(fd)
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finally:
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_os.unlink(filename)
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return dir
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except FileExistsError:
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pass
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except PermissionError:
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# This exception is thrown when a directory with the chosen name
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# already exists on windows.
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if (_os.name == 'nt' and _os.path.isdir(dir) and
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_os.access(dir, _os.W_OK)):
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continue
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break # no point trying more names in this directory
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except OSError:
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break # no point trying more names in this directory
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raise FileNotFoundError(_errno.ENOENT,
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"No usable temporary directory found in %s" %
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dirlist)
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_name_sequence = None
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def _get_candidate_names():
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"""Common setup sequence for all user-callable interfaces."""
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global _name_sequence
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if _name_sequence is None:
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_once_lock.acquire()
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try:
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if _name_sequence is None:
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_name_sequence = _RandomNameSequence()
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finally:
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_once_lock.release()
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return _name_sequence
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def _mkstemp_inner(dir, pre, suf, flags, output_type):
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"""Code common to mkstemp, TemporaryFile, and NamedTemporaryFile."""
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dir = _os.path.abspath(dir)
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names = _get_candidate_names()
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if output_type is bytes:
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names = map(_os.fsencode, names)
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for seq in range(TMP_MAX):
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name = next(names)
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file = _os.path.join(dir, pre + name + suf)
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_sys.audit("tempfile.mkstemp", file)
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try:
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fd = _os.open(file, flags, 0o600)
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except FileExistsError:
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continue # try again
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except PermissionError:
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# This exception is thrown when a directory with the chosen name
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# already exists on windows.
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if (_os.name == 'nt' and _os.path.isdir(dir) and
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_os.access(dir, _os.W_OK)):
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continue
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else:
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raise
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return fd, file
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raise FileExistsError(_errno.EEXIST,
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"No usable temporary file name found")
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# User visible interfaces.
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def gettempprefix():
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"""The default prefix for temporary directories as string."""
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return _os.fsdecode(template)
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def gettempprefixb():
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"""The default prefix for temporary directories as bytes."""
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return _os.fsencode(template)
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tempdir = None
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def _gettempdir():
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"""Private accessor for tempfile.tempdir."""
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global tempdir
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if tempdir is None:
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_once_lock.acquire()
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try:
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if tempdir is None:
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tempdir = _get_default_tempdir()
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finally:
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_once_lock.release()
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return tempdir
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def gettempdir():
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"""Returns tempfile.tempdir as str."""
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return _os.fsdecode(_gettempdir())
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def gettempdirb():
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"""Returns tempfile.tempdir as bytes."""
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return _os.fsencode(_gettempdir())
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def mkstemp(suffix=None, prefix=None, dir=None, text=False):
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"""User-callable function to create and return a unique temporary
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file. The return value is a pair (fd, name) where fd is the
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file descriptor returned by os.open, and name is the filename.
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If 'suffix' is not None, the file name will end with that suffix,
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otherwise there will be no suffix.
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If 'prefix' is not None, the file name will begin with that prefix,
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otherwise a default prefix is used.
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If 'dir' is not None, the file will be created in that directory,
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otherwise a default directory is used.
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If 'text' is specified and true, the file is opened in text
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mode. Else (the default) the file is opened in binary mode.
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If any of 'suffix', 'prefix' and 'dir' are not None, they must be the
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same type. If they are bytes, the returned name will be bytes; str
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otherwise.
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The file is readable and writable only by the creating user ID.
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If the operating system uses permission bits to indicate whether a
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file is executable, the file is executable by no one. The file
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descriptor is not inherited by children of this process.
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Caller is responsible for deleting the file when done with it.
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"""
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prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)
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if text:
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flags = _text_openflags
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else:
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flags = _bin_openflags
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return _mkstemp_inner(dir, prefix, suffix, flags, output_type)
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def mkdtemp(suffix=None, prefix=None, dir=None):
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"""User-callable function to create and return a unique temporary
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directory. The return value is the pathname of the directory.
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Arguments are as for mkstemp, except that the 'text' argument is
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not accepted.
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The directory is readable, writable, and searchable only by the
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creating user.
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Caller is responsible for deleting the directory when done with it.
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"""
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prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)
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names = _get_candidate_names()
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if output_type is bytes:
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names = map(_os.fsencode, names)
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for seq in range(TMP_MAX):
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name = next(names)
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file = _os.path.join(dir, prefix + name + suffix)
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_sys.audit("tempfile.mkdtemp", file)
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try:
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_os.mkdir(file, 0o700)
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except FileExistsError:
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continue # try again
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except PermissionError:
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# This exception is thrown when a directory with the chosen name
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# already exists on windows.
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if (_os.name == 'nt' and _os.path.isdir(dir) and
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_os.access(dir, _os.W_OK)):
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continue
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else:
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raise
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return file
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raise FileExistsError(_errno.EEXIST,
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"No usable temporary directory name found")
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def mktemp(suffix="", prefix=template, dir=None):
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"""User-callable function to return a unique temporary file name. The
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file is not created.
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Arguments are similar to mkstemp, except that the 'text' argument is
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not accepted, and suffix=None, prefix=None and bytes file names are not
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supported.
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THIS FUNCTION IS UNSAFE AND SHOULD NOT BE USED. The file name may
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refer to a file that did not exist at some point, but by the time
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you get around to creating it, someone else may have beaten you to
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the punch.
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"""
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## from warnings import warn as _warn
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## _warn("mktemp is a potential security risk to your program",
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## RuntimeWarning, stacklevel=2)
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if dir is None:
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dir = gettempdir()
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names = _get_candidate_names()
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for seq in range(TMP_MAX):
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name = next(names)
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file = _os.path.join(dir, prefix + name + suffix)
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if not _exists(file):
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return file
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raise FileExistsError(_errno.EEXIST,
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"No usable temporary filename found")
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class _TemporaryFileCloser:
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"""A separate object allowing proper closing of a temporary file's
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underlying file object, without adding a __del__ method to the
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temporary file."""
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file = None # Set here since __del__ checks it
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close_called = False
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def __init__(self, file, name, delete=True):
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self.file = file
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self.name = name
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self.delete = delete
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# NT provides delete-on-close as a primitive, so we don't need
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# the wrapper to do anything special. We still use it so that
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# file.name is useful (i.e. not "(fdopen)") with NamedTemporaryFile.
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if _os.name != 'nt':
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# Cache the unlinker so we don't get spurious errors at
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# shutdown when the module-level "os" is None'd out. Note
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# that this must be referenced as self.unlink, because the
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# name TemporaryFileWrapper may also get None'd out before
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# __del__ is called.
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def close(self, unlink=_os.unlink):
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if not self.close_called and self.file is not None:
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self.close_called = True
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try:
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self.file.close()
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finally:
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if self.delete:
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unlink(self.name)
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# Need to ensure the file is deleted on __del__
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def __del__(self):
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self.close()
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else:
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def close(self):
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if not self.close_called:
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self.close_called = True
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self.file.close()
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class _TemporaryFileWrapper:
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"""Temporary file wrapper
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This class provides a wrapper around files opened for
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temporary use. In particular, it seeks to automatically
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remove the file when it is no longer needed.
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"""
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def __init__(self, file, name, delete=True):
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self.file = file
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self.name = name
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self.delete = delete
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self._closer = _TemporaryFileCloser(file, name, delete)
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def __getattr__(self, name):
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# Attribute lookups are delegated to the underlying file
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# and cached for non-numeric results
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# (i.e. methods are cached, closed and friends are not)
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file = self.__dict__['file']
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a = getattr(file, name)
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if hasattr(a, '__call__'):
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func = a
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@_functools.wraps(func)
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def func_wrapper(*args, **kwargs):
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return func(*args, **kwargs)
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# Avoid closing the file as long as the wrapper is alive,
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# see issue #18879.
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func_wrapper._closer = self._closer
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a = func_wrapper
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if not isinstance(a, int):
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setattr(self, name, a)
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return a
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# The underlying __enter__ method returns the wrong object
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# (self.file) so override it to return the wrapper
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def __enter__(self):
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self.file.__enter__()
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return self
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# Need to trap __exit__ as well to ensure the file gets
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# deleted when used in a with statement
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def __exit__(self, exc, value, tb):
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result = self.file.__exit__(exc, value, tb)
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self.close()
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return result
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def close(self):
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"""
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Close the temporary file, possibly deleting it.
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"""
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self._closer.close()
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# iter() doesn't use __getattr__ to find the __iter__ method
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def __iter__(self):
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# Don't return iter(self.file), but yield from it to avoid closing
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# file as long as it's being used as iterator (see issue #23700). We
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# can't use 'yield from' here because iter(file) returns the file
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# object itself, which has a close method, and thus the file would get
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# closed when the generator is finalized, due to PEP380 semantics.
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for line in self.file:
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yield line
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def NamedTemporaryFile(mode='w+b', buffering=-1, encoding=None,
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newline=None, suffix=None, prefix=None,
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dir=None, delete=True, *, errors=None):
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"""Create and return a temporary file.
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Arguments:
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'prefix', 'suffix', 'dir' -- as for mkstemp.
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'mode' -- the mode argument to io.open (default "w+b").
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'buffering' -- the buffer size argument to io.open (default -1).
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'encoding' -- the encoding argument to io.open (default None)
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'newline' -- the newline argument to io.open (default None)
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'delete' -- whether the file is deleted on close (default True).
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'errors' -- the errors argument to io.open (default None)
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The file is created as mkstemp() would do it.
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Returns an object with a file-like interface; the name of the file
|
|
is accessible as its 'name' attribute. The file will be automatically
|
|
deleted when it is closed unless the 'delete' argument is set to False.
|
|
|
|
On POSIX, NamedTemporaryFiles cannot be automatically deleted if
|
|
the creating process is terminated abruptly with a SIGKILL signal.
|
|
Windows can delete the file even in this case.
|
|
"""
|
|
|
|
prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)
|
|
|
|
flags = _bin_openflags
|
|
|
|
# Setting O_TEMPORARY in the flags causes the OS to delete
|
|
# the file when it is closed. This is only supported by Windows.
|
|
if _os.name == 'nt' and delete:
|
|
flags |= _os.O_TEMPORARY
|
|
|
|
if "b" not in mode:
|
|
encoding = _io.text_encoding(encoding)
|
|
|
|
name = None
|
|
def opener(*args):
|
|
nonlocal name
|
|
fd, name = _mkstemp_inner(dir, prefix, suffix, flags, output_type)
|
|
return fd
|
|
try:
|
|
file = _io.open(dir, mode, buffering=buffering,
|
|
newline=newline, encoding=encoding, errors=errors,
|
|
opener=opener)
|
|
try:
|
|
raw = getattr(file, 'buffer', file)
|
|
raw = getattr(raw, 'raw', raw)
|
|
raw.name = name
|
|
return _TemporaryFileWrapper(file, name, delete)
|
|
except:
|
|
file.close()
|
|
raise
|
|
except:
|
|
if name is not None and not (_os.name == 'nt' and delete):
|
|
_os.unlink(name)
|
|
raise
|
|
|
|
if _os.name != 'posix' or _sys.platform == 'cygwin':
|
|
# On non-POSIX and Cygwin systems, assume that we cannot unlink a file
|
|
# while it is open.
|
|
TemporaryFile = NamedTemporaryFile
|
|
|
|
else:
|
|
# Is the O_TMPFILE flag available and does it work?
|
|
# The flag is set to False if os.open(dir, os.O_TMPFILE) raises an
|
|
# IsADirectoryError exception
|
|
_O_TMPFILE_WORKS = hasattr(_os, 'O_TMPFILE')
|
|
|
|
def TemporaryFile(mode='w+b', buffering=-1, encoding=None,
|
|
newline=None, suffix=None, prefix=None,
|
|
dir=None, *, errors=None):
|
|
"""Create and return a temporary file.
|
|
Arguments:
|
|
'prefix', 'suffix', 'dir' -- as for mkstemp.
|
|
'mode' -- the mode argument to io.open (default "w+b").
|
|
'buffering' -- the buffer size argument to io.open (default -1).
|
|
'encoding' -- the encoding argument to io.open (default None)
|
|
'newline' -- the newline argument to io.open (default None)
|
|
'errors' -- the errors argument to io.open (default None)
|
|
The file is created as mkstemp() would do it.
|
|
|
|
Returns an object with a file-like interface. The file has no
|
|
name, and will cease to exist when it is closed.
|
|
"""
|
|
global _O_TMPFILE_WORKS
|
|
|
|
if "b" not in mode:
|
|
encoding = _io.text_encoding(encoding)
|
|
|
|
prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)
|
|
|
|
flags = _bin_openflags
|
|
if _O_TMPFILE_WORKS:
|
|
fd = None
|
|
def opener(*args):
|
|
nonlocal fd
|
|
flags2 = (flags | _os.O_TMPFILE) & ~_os.O_CREAT
|
|
fd = _os.open(dir, flags2, 0o600)
|
|
return fd
|
|
try:
|
|
file = _io.open(dir, mode, buffering=buffering,
|
|
newline=newline, encoding=encoding,
|
|
errors=errors, opener=opener)
|
|
raw = getattr(file, 'buffer', file)
|
|
raw = getattr(raw, 'raw', raw)
|
|
raw.name = fd
|
|
return file
|
|
except IsADirectoryError:
|
|
# Linux kernel older than 3.11 ignores the O_TMPFILE flag:
|
|
# O_TMPFILE is read as O_DIRECTORY. Trying to open a directory
|
|
# with O_RDWR|O_DIRECTORY fails with IsADirectoryError, a
|
|
# directory cannot be open to write. Set flag to False to not
|
|
# try again.
|
|
_O_TMPFILE_WORKS = False
|
|
except OSError:
|
|
# The filesystem of the directory does not support O_TMPFILE.
|
|
# For example, OSError(95, 'Operation not supported').
|
|
#
|
|
# On Linux kernel older than 3.11, trying to open a regular
|
|
# file (or a symbolic link to a regular file) with O_TMPFILE
|
|
# fails with NotADirectoryError, because O_TMPFILE is read as
|
|
# O_DIRECTORY.
|
|
pass
|
|
# Fallback to _mkstemp_inner().
|
|
|
|
fd = None
|
|
def opener(*args):
|
|
nonlocal fd
|
|
fd, name = _mkstemp_inner(dir, prefix, suffix, flags, output_type)
|
|
try:
|
|
_os.unlink(name)
|
|
except BaseException as e:
|
|
_os.close(fd)
|
|
raise
|
|
return fd
|
|
file = _io.open(dir, mode, buffering=buffering,
|
|
newline=newline, encoding=encoding, errors=errors,
|
|
opener=opener)
|
|
raw = getattr(file, 'buffer', file)
|
|
raw = getattr(raw, 'raw', raw)
|
|
raw.name = fd
|
|
return file
|
|
|
|
class SpooledTemporaryFile(_io.IOBase):
|
|
"""Temporary file wrapper, specialized to switch from BytesIO
|
|
or StringIO to a real file when it exceeds a certain size or
|
|
when a fileno is needed.
|
|
"""
|
|
_rolled = False
|
|
|
|
def __init__(self, max_size=0, mode='w+b', buffering=-1,
|
|
encoding=None, newline=None,
|
|
suffix=None, prefix=None, dir=None, *, errors=None):
|
|
if 'b' in mode:
|
|
self._file = _io.BytesIO()
|
|
else:
|
|
encoding = _io.text_encoding(encoding)
|
|
self._file = _io.TextIOWrapper(_io.BytesIO(),
|
|
encoding=encoding, errors=errors,
|
|
newline=newline)
|
|
self._max_size = max_size
|
|
self._rolled = False
|
|
self._TemporaryFileArgs = {'mode': mode, 'buffering': buffering,
|
|
'suffix': suffix, 'prefix': prefix,
|
|
'encoding': encoding, 'newline': newline,
|
|
'dir': dir, 'errors': errors}
|
|
|
|
__class_getitem__ = classmethod(_types.GenericAlias)
|
|
|
|
def _check(self, file):
|
|
if self._rolled: return
|
|
max_size = self._max_size
|
|
if max_size and file.tell() > max_size:
|
|
self.rollover()
|
|
|
|
def rollover(self):
|
|
if self._rolled: return
|
|
file = self._file
|
|
newfile = self._file = TemporaryFile(**self._TemporaryFileArgs)
|
|
del self._TemporaryFileArgs
|
|
|
|
pos = file.tell()
|
|
if hasattr(newfile, 'buffer'):
|
|
newfile.buffer.write(file.detach().getvalue())
|
|
else:
|
|
newfile.write(file.getvalue())
|
|
newfile.seek(pos, 0)
|
|
|
|
self._rolled = True
|
|
|
|
# The method caching trick from NamedTemporaryFile
|
|
# won't work here, because _file may change from a
|
|
# BytesIO/StringIO instance to a real file. So we list
|
|
# all the methods directly.
|
|
|
|
# Context management protocol
|
|
def __enter__(self):
|
|
if self._file.closed:
|
|
raise ValueError("Cannot enter context with closed file")
|
|
return self
|
|
|
|
def __exit__(self, exc, value, tb):
|
|
self._file.close()
|
|
|
|
# file protocol
|
|
def __iter__(self):
|
|
return self._file.__iter__()
|
|
|
|
def __del__(self):
|
|
if not self.closed:
|
|
_warnings.warn(
|
|
"Unclosed file {!r}".format(self),
|
|
ResourceWarning,
|
|
stacklevel=2,
|
|
source=self
|
|
)
|
|
self.close()
|
|
|
|
def close(self):
|
|
self._file.close()
|
|
|
|
@property
|
|
def closed(self):
|
|
return self._file.closed
|
|
|
|
@property
|
|
def encoding(self):
|
|
return self._file.encoding
|
|
|
|
@property
|
|
def errors(self):
|
|
return self._file.errors
|
|
|
|
def fileno(self):
|
|
self.rollover()
|
|
return self._file.fileno()
|
|
|
|
def flush(self):
|
|
self._file.flush()
|
|
|
|
def isatty(self):
|
|
return self._file.isatty()
|
|
|
|
@property
|
|
def mode(self):
|
|
try:
|
|
return self._file.mode
|
|
except AttributeError:
|
|
return self._TemporaryFileArgs['mode']
|
|
|
|
@property
|
|
def name(self):
|
|
try:
|
|
return self._file.name
|
|
except AttributeError:
|
|
return None
|
|
|
|
@property
|
|
def newlines(self):
|
|
return self._file.newlines
|
|
|
|
def readable(self):
|
|
return self._file.readable()
|
|
|
|
def read(self, *args):
|
|
return self._file.read(*args)
|
|
|
|
def read1(self, *args):
|
|
return self._file.read1(*args)
|
|
|
|
def readinto(self, b):
|
|
return self._file.readinto(b)
|
|
|
|
def readinto1(self, b):
|
|
return self._file.readinto1(b)
|
|
|
|
def readline(self, *args):
|
|
return self._file.readline(*args)
|
|
|
|
def readlines(self, *args):
|
|
return self._file.readlines(*args)
|
|
|
|
def seekable(self):
|
|
return self._file.seekable()
|
|
|
|
def seek(self, *args):
|
|
return self._file.seek(*args)
|
|
|
|
def tell(self):
|
|
return self._file.tell()
|
|
|
|
def truncate(self, size=None):
|
|
if size is None:
|
|
return self._file.truncate()
|
|
else:
|
|
if size > self._max_size:
|
|
self.rollover()
|
|
return self._file.truncate(size)
|
|
|
|
def writable(self):
|
|
return self._file.writable()
|
|
|
|
def write(self, s):
|
|
file = self._file
|
|
rv = file.write(s)
|
|
self._check(file)
|
|
return rv
|
|
|
|
def writelines(self, iterable):
|
|
file = self._file
|
|
rv = file.writelines(iterable)
|
|
self._check(file)
|
|
return rv
|
|
|
|
def detach(self):
|
|
return self._file.detach()
|
|
|
|
|
|
class TemporaryDirectory:
|
|
"""Create and return a temporary directory. This has the same
|
|
behavior as mkdtemp but can be used as a context manager. For
|
|
example:
|
|
|
|
with TemporaryDirectory() as tmpdir:
|
|
...
|
|
|
|
Upon exiting the context, the directory and everything contained
|
|
in it are removed.
|
|
"""
|
|
|
|
def __init__(self, suffix=None, prefix=None, dir=None,
|
|
ignore_cleanup_errors=False):
|
|
self.name = mkdtemp(suffix, prefix, dir)
|
|
self._ignore_cleanup_errors = ignore_cleanup_errors
|
|
self._finalizer = _weakref.finalize(
|
|
self, self._cleanup, self.name,
|
|
warn_message="Implicitly cleaning up {!r}".format(self),
|
|
ignore_errors=self._ignore_cleanup_errors)
|
|
|
|
@classmethod
|
|
def _rmtree(cls, name, ignore_errors=False):
|
|
def onerror(func, path, exc_info):
|
|
if issubclass(exc_info[0], PermissionError):
|
|
def resetperms(path):
|
|
try:
|
|
_os.chflags(path, 0)
|
|
except AttributeError:
|
|
pass
|
|
_os.chmod(path, 0o700)
|
|
|
|
try:
|
|
if path != name:
|
|
resetperms(_os.path.dirname(path))
|
|
resetperms(path)
|
|
|
|
try:
|
|
_os.unlink(path)
|
|
# PermissionError is raised on FreeBSD for directories
|
|
except (IsADirectoryError, PermissionError):
|
|
cls._rmtree(path, ignore_errors=ignore_errors)
|
|
except FileNotFoundError:
|
|
pass
|
|
elif issubclass(exc_info[0], FileNotFoundError):
|
|
pass
|
|
else:
|
|
if not ignore_errors:
|
|
raise
|
|
|
|
_shutil.rmtree(name, onerror=onerror)
|
|
|
|
@classmethod
|
|
def _cleanup(cls, name, warn_message, ignore_errors=False):
|
|
cls._rmtree(name, ignore_errors=ignore_errors)
|
|
_warnings.warn(warn_message, ResourceWarning)
|
|
|
|
def __repr__(self):
|
|
return "<{} {!r}>".format(self.__class__.__name__, self.name)
|
|
|
|
def __enter__(self):
|
|
return self.name
|
|
|
|
def __exit__(self, exc, value, tb):
|
|
self.cleanup()
|
|
|
|
def cleanup(self):
|
|
if self._finalizer.detach() or _os.path.exists(self.name):
|
|
self._rmtree(self.name, ignore_errors=self._ignore_cleanup_errors)
|
|
|
|
__class_getitem__ = classmethod(_types.GenericAlias)
|