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Like tempfile.mkdtemp, but using /var/tmp as a last resort instead of /tmp.
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If no name for a region is otherwise defined (i.e. service.region_name
is None and the AWS_AUTH_REGION environment variable is not set),
log a notice and add a fake region name so HmacV4Auth has something
to work with. This works because eucalyptus doesn't care what name
one chooses for a region.
Setups that use eucarc files against AWS will still be broken.
t AWS_AUTH_REGIONs
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Generate a dict with keys for each service and values for those
services' corresponding URL environment variables, if any.
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