If you follow the Openstack  command line client tools installation guide you will have an issue. For example to install the keystone tools (Mind root access, add sudo when needed):

#easy_install pip

#pip install python-keystoneclient

This will result in the error when trying to execute the tools (with nova you would get the same error!):

$ keystone –list

Traceback (most recent call last):

File “/usr/local/bin/keystone”, line 7, in <module>

from keystoneclient.shell import main

File “/Library/Python/2.7/site-packages/keystoneclient/__init__.py”, line 37, in <module>

__version__ = pbr.version.VersionInfo(‘python-keystoneclient’).version_string()

File “/Library/Python/2.7/site-packages/pbr/version.py”, line 78, in version_string

for part in self.release_string().split(‘.’):

File “/Library/Python/2.7/site-packages/pbr/version.py”, line 70, in release_string

self.release = self._get_version_from_pkg_resources()

File “/Library/Python/2.7/site-packages/pbr/version.py”, line 62, in _get_version_from_pkg_resources

return packaging.get_version(self.package)

File “/Library/Python/2.7/site-packages/pbr/packaging.py”, line 870, in get_version

raise Exception(“Versioning for this project requires either an sdist”

Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository. Are you sure that git is installed?

The solution: install also the distribute package:

 pip install –upgrade distribute