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|
"""Manage filesystems in temporary locations.
A temporary filesytem is stored in a location defined by your OS
(``/tmp`` on linux). The contents are deleted when the filesystem
is closed.
A `TempFS` is a good way of preparing a directory structure in advance,
that you can later copy. It can also be used as a temporary data store.
"""
from __future__ import print_function, unicode_literals
import typing
import shutil
import tempfile
from . import errors
from .osfs import OSFS
if typing.TYPE_CHECKING:
from typing import Optional, Text
class TempFS(OSFS):
"""A temporary filesystem on the OS.
Temporary filesystems are created using the `tempfile.mkdtemp`
function to obtain a temporary folder in an OS-specific location.
You can provide an alternative location with the ``temp_dir``
argument of the constructor.
Examples:
Create with the constructor::
>>> from fs.tempfs import TempFS
>>> tmp_fs = TempFS()
Or via an FS URL::
>>> import fs
>>> tmp_fs = fs.open_fs("temp://")
Use a specific identifier for the temporary folder to better
illustrate its purpose::
>>> named_tmp_fs = fs.open_fs("temp://local_copy")
>>> named_tmp_fs = TempFS(identifier="local_copy")
"""
def __init__(
self,
identifier="__tempfs__", # type: Text
temp_dir=None, # type: Optional[Text]
auto_clean=True, # type: bool
ignore_clean_errors=True, # type: bool
):
# type: (...) -> None
"""Create a new `TempFS` instance.
Arguments:
identifier (str): A string to distinguish the directory within
the OS temp location, used as part of the directory name.
temp_dir (str, optional): An OS path to your temp directory
(leave as `None` to auto-detect).
auto_clean (bool): If `True` (the default), the directory
contents will be wiped on close.
ignore_clean_errors (bool): If `True` (the default), any errors
in the clean process will be suppressed. If `False`, they
will be raised.
"""
self.identifier = identifier
self._auto_clean = auto_clean
self._ignore_clean_errors = ignore_clean_errors
self._cleaned = False
self.identifier = identifier.replace("/", "-")
self._temp_dir = tempfile.mkdtemp(identifier or "fsTempFS", dir=temp_dir)
super(TempFS, self).__init__(self._temp_dir)
def __repr__(self):
# type: () -> Text
return "TempFS()"
def __str__(self):
# type: () -> Text
return "<tempfs '{}'>".format(self._temp_dir)
def close(self):
# type: () -> None
"""Close the filesystem and release any resources.
It is important to call this method when you have finished
working with the filesystem. Some filesystems may not finalize
changes until they are closed (archives for example). You may
call this method explicitly (it is safe to call close multiple
times), or you can use the filesystem as a context manager to
automatically close.
Hint:
Depending on the value of ``auto_clean`` passed when creating
the `TempFS`, the underlying temporary folder may be removed
or not.
Example:
>>> tmp_fs = TempFS(auto_clean=False)
>>> syspath = tmp_fs.getsyspath("/")
>>> tmp_fs.close()
>>> os.path.exists(syspath)
True
"""
if self._auto_clean:
self.clean()
super(TempFS, self).close()
def clean(self):
# type: () -> None
"""Clean (delete) temporary files created by this filesystem."""
if self._cleaned:
return
try:
shutil.rmtree(self._temp_dir)
except Exception as error:
if not self._ignore_clean_errors:
raise errors.OperationFailed(
msg="failed to remove temporary directory; {}".format(error),
exc=error,
)
self._cleaned = True
|
