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Fixing untrustable os.path.exists

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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 one
process and `False` for another, resulting in the exception I
handle with this patch.
This commit is contained in:
László Károlyi 2017-10-27 15:04:39 +02:00 committed by jorgecarleitao
parent 253c4c2898
commit 3c322a9552
1 changed files with 5 additions and 2 deletions
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7
xapian_backend.py
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@ -193,8 +193,11 @@ class XapianSearchBackend(BaseSearchBackend):
self.path = connection_options.get('PATH')
if self.path != MEMORY_DB_NAME and not os.path.exists(self.path):
os.makedirs(self.path)
if self.path != MEMORY_DB_NAME:
try:
os.makedirs(self.path)
except FileExistsError:
pass
self.flags = connection_options.get('FLAGS', DEFAULT_XAPIAN_FLAGS)
self.language = getattr(settings, 'HAYSTACK_XAPIAN_LANGUAGE', 'english')