Race in cacheable_download

[Stefano Rivera]

2009-08-15 21:01:32+0000 <Qix> rfc 2082
2009-08-15 21:02:18+0000 <Dazzle> RIP-2 MD5 Authentication. F. Baker, R. Atkinson. January 1997. (Format: TXT=25436 bytes) (Obsoleted by RFC4822) (Status: PROPOSED STANDARD) http:/
/www.rfc-editor.org/rfc/rfc2082.txt
2009-08-15 21:01:41+0000 <Qix> rfc 17
2009-08-15 21:02:40+0000 <Dazzle> That didn't go down very well. Burp.

2009-08-15 21:02:40,657 ERROR core.dispatcher: Exception occured in RFCLookup processor of rfc plugin
Traceback (most recent call last):
  File "/home/dazzle/ibid/dazzle/ibid/core.py", line 25, in _process
    processor.process(event)
  File "/home/dazzle/ibid/dazzle/ibid/plugins/__init__.py", line 65, in process
    method(event, *match.groups())
  File "/home/dazzle/ibid/dazzle/ibid/plugins/rfc.py", line 155, in lookup
    rfcs = self._parse_rfcs()
  File "/home/dazzle/ibid/dazzle/ibid/plugins/rfc.py", line 121, in _parse_rfcs
    self._update_list()
  File "/home/dazzle/ibid/dazzle/ibid/plugins/rfc.py", line 27, in _update_list
    self.indexfile = cacheable_download(self.indexurl, "rfc/rfc-index.txt")
  File "/home/dazzle/ibid/dazzle/ibid/utils.py", line 119, in cacheable_download
    os.rename(downloadfile, cachefile)
OSError: [Errno 2] No such file or directory

1st one renamed the temporary file, that they were both writing to