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Mordernize utils.lock

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Kovid Goyal 2017-05-03 20:28:57 +05:30
parent e7a906241c
commit 5fd8c81661
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1 changed files with 12 additions and 12 deletions
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24
src/calibre/utils/lock.py
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@ -1,9 +1,8 @@
__license__ = 'GPL v3'
__copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
__docformat__ = 'restructuredtext en'
'''
Secure access to locked files from multiple processes.
'''
#!/usr/bin/env python2
# vim:fileencoding=utf-8
# License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
from __future__ import absolute_import, division, print_function, unicode_literals
import atexit
import errno
@ -14,10 +13,11 @@ import time
from functools import partial
from calibre.constants import (
__appname__, fcntl, filesystem_encoding, islinux, isosx, iswindows
__appname__, fcntl, filesystem_encoding, islinux, isosx, iswindows, plugins
)
from calibre.utils.monotonic import monotonic
speedup = plugins['speedup'][0]
if iswindows:
import msvcrt, win32file, pywintypes, winerror, win32api, win32event
from calibre.constants import get_windows_username
@ -28,8 +28,6 @@ else:
def unix_open(path):
flags = os.O_RDWR | os.O_CREAT
from calibre.constants import plugins
speedup = plugins['speedup'][0]
has_cloexec = False
if hasattr(speedup, 'O_CLOEXEC'):
try:
@ -149,8 +147,7 @@ elif islinux:
name = '%s-singleinstance-%s-%s' % (
__appname__, (os.geteuid() if per_user else ''), name
)
if not isinstance(name, bytes):
name = name.encode('utf-8')
name = name.encode('utf-8')
address = b'\0' + name.replace(b' ', b'_')
sock = socket.socket(family=socket.AF_UNIX)
try:
@ -177,7 +174,9 @@ else:
for loc in locs:
if os.access(loc, os.W_OK | os.R_OK | os.X_OK):
return os.path.join(loc, ('.' if loc is home else '') + name)
raise EnvironmentError('Failed to find a suitable filesystem location for the lock file')
raise EnvironmentError(
'Failed to find a suitable filesystem location for the lock file'
)
def create_single_instance_mutex(name, per_user=True):
from calibre.utils.ipc import eintr_retry_call
@ -192,6 +191,7 @@ else:
def singleinstance(name):
' Ensure that only a single process holding exists with the specified mutex key '
release_mutex = create_single_instance_mutex(name)
if release_mutex is None:
return False