New submission from Josh Triplett <[email protected]>:
In Python 2.7.2, pydoc.py's synopsis contains this code implementing a cache:
mtime = os.stat(filename).st_mtime
lastupdate, result = cache.get(filename, (0, None))
if lastupdate < mtime:
Many filesystems don't have any concept of mtime or don't have it available,
including many FUSE filesystems, as well as our implementation of stat for GRUB
in BITS. Such systems typically return an mtime of 0. (In addition, 0
represents a valid mtime.) Since the cache in pydoc.synopsis initializes
lastupdate to 0 for entries not found in the cache, this causes synopsis to
always return None. I'd suggest either extending the conditional to check
"lastupdate != 0 and lastupdate < mtime" (which would always treat an mtime of
0 as requiring an update, which would make sense for filesystems without valid
mtimes) or changing the .get to return (None, None) and checking "lastupdate is
not None and lastupdate < mtime", which would treat an mtime of 0 as valid but
still handle the case of not having a cache entry the first time.
----------
components: Library (Lib)
messages: 140826
nosy: joshtriplett
priority: normal
severity: normal
status: open
title: pydoc.synopsis breaks if filesystem returns mtime of 0 (common for
filesystems without mtime)
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue12603>
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