I am trying to install nova-compute nova-api nova-xxx tools using nova.git. Trying to understand how the process works. Please guide

  Is the process correct
    a) clone openstack nova.git
    b) run python setup.py install
    c) tox -egenconfig

Step (c) is stuck on

genconfig create: /root/openstack/nova/.tox/genconfig
genconfig installdeps: -r/root/openstack/nova/requirements.txt, -r/root/openstack/nova/test-requirements.txt