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"""
Helper script which provides an integer number from a given range based on a
hash of current directory name.
This is used in continuous integration as a helper to provide ports to assign
to services like Redis, Memcached when they are run on a per-test basis.
E.g. in a Jenkins job, one could put as the run command::
export TOX_DOGPILE_PORT=`python tools/hash_port.py 10000 34000`
nox -v -t ${pyv}-${backend}
So you'd get one TOX_DOGPILE_PORT for the script in
/var/lib/jenkins-workspace/py27-redis, another TOX_DOGPILE_PORT for the script
in /var/lib/jenkins-workspace/py34-memcached. nox (as well as the previous tox
setup) calls the pifpaf tool to run redis/ memcached local to that build and
has it listen on this port.
"""
import os
import sys
start, end = int(sys.argv[1]), int(sys.argv[2])
dir_ = os.getcwd()
print((hash(dir_) % (end - start)) + start)
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