If refstack-client is cloned to a place in the filesystem with a pretty long path, such that the path to pip in the virtualenv exceeds about 128 characters (with the #! in the shebang line.) then setup_env will fail because the path to the interpreter gets truncated. This is a known issue with pip [1] due to a kernel limitation on the size of the shebang line [2].
+ /<long path>/refstack-client/.tempest/.venv/bin/pip install -r /<long path>/refstack-client/.tempest/requirements.txt
./setup_env: /<long path>/refstack-client/.tempest/.venv/bin/pip: /<long path truncated>: bad interpreter: No such file or directory
----refstack client installation failed-----
[1] https://github.com/pypa/pip/issues/1773
[2] http://stackoverflow.com/questions/10813538/shebang-line-limit-in-bash-and-linux-kernel
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