Antoine Pitrou <[email protected]> added the comment:
> > This new patch also fixes importlib.
>
> """
> path_tmp = path + '.tmp'
> with _io.FileIO(path_tmp, 'wb') as file:
> file.write(data)
> _os.rename(path_tmp, path)
> """
>
> I don't know exactly the context in which this code runs, but you can
> have a corruption if multiple processes try to write the bytecode file
> at the same time, since they'll all open the .tmp file: it should be
> opened with O_EXCL.
Or perhaps append the PID to the name of the temp file ?
(easier done in Python than in C :-))
> Also, as a side note, I'm wondering whether this type of check:
> """
> if not sys.platform.startswith('win'):
> # On POSIX-like platforms, renaming is atomic
> """
>
> couldn't be rewritten as
> """
> if os.name == 'posix':
> # On POSIX-like platforms, renaming is atomic
> """
No, because os.py is not available to importlib (which must be
bootstrappable early). See the _bootstrap.py header for information
about what is available; this is also why we use FileIO instead of
open().
> Fox example, does OS-X report as POSIX?
I think so.
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<http://bugs.python.org/issue13146>
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