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154 lines
5.1 KiB
154 lines
5.1 KiB
"""TemporaryDirectory class, copied from Python 3
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NamedFileInTemporaryDirectory and TemporaryWorkingDirectory from IPython, which
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uses the 3-clause BSD license.
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"""
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from __future__ import print_function
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import os as _os
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import warnings as _warnings
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import sys as _sys
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# This code should only be used in Python versions < 3.2, since after that we
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# can rely on the stdlib itself.
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try:
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from tempfile import TemporaryDirectory
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except ImportError:
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from tempfile import mkdtemp, template
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class TemporaryDirectory(object):
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"""Create and return a temporary directory. This has the same
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behavior as mkdtemp but can be used as a context manager. For
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example:
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with TemporaryDirectory() as tmpdir:
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...
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Upon exiting the context, the directory and everything contained
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in it are removed.
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"""
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def __init__(self, suffix="", prefix=template, dir=None):
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self.name = mkdtemp(suffix, prefix, dir)
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self._closed = False
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def __enter__(self):
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return self.name
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def cleanup(self, _warn=False):
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if self.name and not self._closed:
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try:
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self._rmtree(self.name)
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except (TypeError, AttributeError) as ex:
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# Issue #10188: Emit a warning on stderr
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# if the directory could not be cleaned
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# up due to missing globals
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if "None" not in str(ex):
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raise
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print("ERROR: {!r} while cleaning up {!r}".format(ex, self,),
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file=_sys.stderr)
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return
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self._closed = True
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if _warn:
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self._warn("Implicitly cleaning up {!r}".format(self),
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Warning)
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def __exit__(self, exc, value, tb):
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self.cleanup()
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def __del__(self):
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# Issue a ResourceWarning if implicit cleanup needed
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self.cleanup(_warn=True)
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# XXX (ncoghlan): The following code attempts to make
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# this class tolerant of the module nulling out process
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# that happens during CPython interpreter shutdown
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# Alas, it doesn't actually manage it. See issue #10188
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_listdir = staticmethod(_os.listdir)
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_path_join = staticmethod(_os.path.join)
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_isdir = staticmethod(_os.path.isdir)
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_remove = staticmethod(_os.remove)
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_rmdir = staticmethod(_os.rmdir)
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_os_error = _os.error
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_warn = _warnings.warn
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def _rmtree(self, path):
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# Essentially a stripped down version of shutil.rmtree. We can't
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# use globals because they may be None'ed out at shutdown.
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for name in self._listdir(path):
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fullname = self._path_join(path, name)
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try:
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isdir = self._isdir(fullname)
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except self._os_error:
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isdir = False
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if isdir:
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self._rmtree(fullname)
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else:
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try:
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self._remove(fullname)
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except self._os_error:
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pass
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try:
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self._rmdir(path)
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except self._os_error:
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pass
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class NamedFileInTemporaryDirectory(object):
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"""Open a file named `filename` in a temporary directory.
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This context manager is preferred over :class:`tempfile.NamedTemporaryFile`
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when one needs to reopen the file, because on Windows only one handle on a
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file can be open at a time. You can close the returned handle explicitly
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inside the context without deleting the file, and the context manager will
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delete the whole directory when it exits.
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Arguments `mode` and `bufsize` are passed to `open`.
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Rest of the arguments are passed to `TemporaryDirectory`.
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Usage example::
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with NamedFileInTemporaryDirectory('myfile', 'wb') as f:
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f.write('stuff')
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f.close()
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# You can now pass f.name to things that will re-open the file
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"""
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def __init__(self, filename, mode='w+b', bufsize=-1, **kwds):
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self._tmpdir = TemporaryDirectory(**kwds)
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path = _os.path.join(self._tmpdir.name, filename)
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self.file = open(path, mode, bufsize)
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def cleanup(self):
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self.file.close()
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self._tmpdir.cleanup()
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__del__ = cleanup
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def __enter__(self):
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return self.file
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def __exit__(self, type, value, traceback):
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self.cleanup()
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class TemporaryWorkingDirectory(TemporaryDirectory):
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"""
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Creates a temporary directory and sets the cwd to that directory.
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Automatically reverts to previous cwd upon cleanup.
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Usage example::
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with TemporaryWorkingDirectory() as tmpdir:
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...
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"""
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def __enter__(self):
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self.old_wd = _os.getcwd()
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_os.chdir(self.name)
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return super(TemporaryWorkingDirectory, self).__enter__()
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def __exit__(self, exc, value, tb):
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_os.chdir(self.old_wd)
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return super(TemporaryWorkingDirectory, self).__exit__(exc, value, tb)
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