Nick Coghlan <ncogh...@gmail.com> added the comment:
I have a slightly better fix for that coming soon. There's a subtle race
condition in the proposed approach that can lead to the temporary dir not being
deleted if an asynchronous exception, such as KeyboardInterrupt, arrives after
mkdtemp completes successfully, but before _closed is set back to False.
Instead, the new init code will look like:
self._closed = False
self.name = None # Handle mkdtemp throwing an exception
self.name = mkdtemp(suffix, prefix, dir)
And the cleanup condition will be gated on self.name being set as well as on
_closed being False. I believe there is still a window where mkdtemp
successfully creates the directory, but self.name never gets set, but we want
to make that window as small as possible.
I also realised this should be emitting a ResourceWarning from __del__, as well
catching the errors and shut down and turning them into something more
meaningful on sys.stderr.
The attached patch won't quite apply cleanly, since it predates r87172
----------
keywords: +patch
Added file: http://bugs.python.org/file20022/issue10888_tempdir_cleanup.diff
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