Comment 6 for bug 1742809

It is required that openstack tarballs be generated in a git context using python setup.py sdist.

github produces its tarballs with git export- which is not supported.

This is not a bug - it is a fundamental design tenet of pbr.

Also, I highly recommend not wgetting the upper-constraints file from github. If you want a copy, the location is:

https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt
?h=stable/rocky