mirror of
https://github.com/JimmXinu/FanFicFare.git
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77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2021 FanFicFare team
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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from __future__ import absolute_import
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'''
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On windows, simple built-in open() fails on cache files due to a
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lock--even when opening read-only.
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Need to jump through various hoops to *really* open
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read-only--different hoops in CLI and Calibre, too.
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'''
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import logging
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logger = logging.getLogger(__name__)
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## CLI version:
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import sys
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_plat = sys.platform.lower()
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iswindows = 'win32' in _plat or 'win64' in _plat
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if iswindows:
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try:
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## Calibre has already had to solve the same problem.
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from calibre.utils.shared_file import share_open
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except ImportError:
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## not stealing calibre's version because read-only is all we
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## need.
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import os
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import win32file
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import msvcrt
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def share_open(path,*args,**kargs):
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# logger.debug("share_open(%s)"%path)
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# does need all three file share flags.
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handle = win32file.CreateFile(path,
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win32file.GENERIC_READ,
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win32file.FILE_SHARE_DELETE |
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win32file.FILE_SHARE_READ |
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win32file.FILE_SHARE_WRITE,
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None,
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win32file.OPEN_EXISTING,
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0,
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None)
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# detach the handle
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detached_handle = handle.Detach()
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# get a file descriptor associated to the handle
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file_descriptor = msvcrt.open_osfhandle(detached_handle, os.O_RDONLY)
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## these can be called *before* the with open read, so
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## clearly they don't matter to that and I don't want to
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## risk leaking file descriptors.
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handle.close()
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win32file.CloseHandle(handle)
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# open the file descriptor
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# this will still allow for "with share_open():"
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return open(file_descriptor,*args,**kargs)
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else:
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## use normal open.
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share_open = open
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