Cutlery/calibre
1
0
Fork 0
mirror of https://github.com/kovidgoyal/calibre.git synced 2025-07-09 03:04:10 -04:00
Code Issues Packages Projects Releases Wiki Activity

Linux build: Workaround for systems that have broken libc implementations that change the behavior of truncate() on file descriptors with O_APPEND set. Fixes #1295366 [json config files get corrupted when using Python 2.7.6 on Linux](https://bugs.launchpad.net/calibre/+bug/1295366)

Browse Source
This commit is contained in:
Kovid Goyal 2014-03-21 09:20:33 +05:30
parent 4a34618df4
commit 1e2febdb37
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/calibre/utils/lock.py
View File

@ -8,7 +8,7 @@ Secure access to locked files from multiple processes.
from calibre.constants import iswindows, __appname__, \
win32api, win32event, winerror, fcntl
import time, atexit, os
import time, atexit, os, stat
class LockError(Exception):
pass
@ -105,6 +105,12 @@ class WindowsExclFile(object):
def closed(self):
return self._handle is None
def unix_open(path):
# We cannot use open(a+b) directly because Fedora apparently ships with a
# broken libc that causes seek(0) followed by truncate() to not work for
# files with O_APPEND set.
fd = os.open(path, os.O_RDWR | os.O_CREAT, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH)
return os.fdopen(fd, 'r+b')
class ExclusiveFile(object):
@ -113,7 +119,7 @@ class ExclusiveFile(object):
self.timeout = timeout
def __enter__(self):
self.file = WindowsExclFile(self.path, self.timeout) if iswindows else open(self.path, 'a+b')
self.file = WindowsExclFile(self.path, self.timeout) if iswindows else unix_open(self.path)
self.file.seek(0)
timeout = self.timeout
if not iswindows: