Charles-François Natali <neolo...@free.fr> added the comment:
There's a race in _write_atomic():
"""
# On POSIX-like platforms, renaming is atomic
path_tmp = path + '.tmp'
try:
fd = _os.open(path_tmp, _os.O_EXCL | _os.O_CREAT | _os.O_WRONLY)
with _io.FileIO(fd, 'wb') as file:
file.write(data)
_os.rename(path_tmp, path)
except OSError:
try:
_os.unlink(path_tmp)
except OSError:
pass
raise
"""
Let's pretend a process managed to open the file (with O_EXCL): before it
finishes and calls rename(), another process tries to open the file: since it
can't create it (with O_EXCL), it jumps to:
except OSError:
try:
_os.unlink(path_tmp)
except OSError:
pass
raise
and unlinks the file.
The first process then calls rename()...
----------
nosy: +neologix
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<http://bugs.python.org/issue13303>
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