File name too long

[schmir]

got the following traceback today:

  File "/home/pp/local/lib/python2.6/site-packages/gevent/greenlet.py", line 327, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/pp/local/lib/python2.6/site-packages/mwlib/net/fetch.py", line 204, in download_to_file
    out = open(temp_path, "wb")
IOError: [Errno 36] File name too long: '/home/pp/sandbox/cache/fc/fc05cf45aeb81b18/tmpV2C4gb/nuwiki/images/~1662~~1585~~1608~~1606~~1583~~1607~:~1585~~1575~~1740~~8204~~1607~~1575~~1740~ ~1605~~1608~~1587~~1608~~1740~ ~1585~~1740~~1575~~1587~~1578~~8204~~1580~~1605~~1607~~1608~~1585~~1740~ ~1583~~1607~~1605~ ~1575~~1740~~1585~~1575~~1606~ ~1576~~1575~ ~1581~~1583~~1608~~1583~ ~1583~~1585~~1589~~1583~ ~1583~~1585~ ~1575~~1587~~1578~~1575~~1606~~8204~~1607~~1575~.png\xc2\xb7'

[Rielin29]

Had to hunt this problem on my company's private wiki.
Cutting long story short - this comes from the utils' fsescape function. Fetch.py uses that to make image file names. And there you see it's six chars for anything other than ascii - means one's allowed around 40 chars in the unicode image name (to fit into 255 chars in filename). As a quick and dirty fix I've changed fsescape to:

no_slash = s.replace("/", "__")
no_backslash = s.replace("\\", "__")
return no_backslash

Which likely won't work in a non-unicode enabled environment and may have other problems, but at least works for my Debian setup so far.