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As per https://stackoverflow.com/a/3112717/1067833,
os.path.exists sometimes delivers a wrong value. These are corner
cases, but mine is exactly one:
I run xapian-haystack in a multiprocess environment (indexing and
django server), on an LXC container, which has its mount probably
mounted from an NFS server (I have no control/information over it).
This corner case results the os.path.exists give
True
for oneprocess and
False
for another, resulting in the exception Ihandle with this patch.