Hi Al & Don: According to https://stackoverflow.com/questions/54315938/why-does-pipenv-fail-to-install... " --no-cache-dir" will cause pip 19 such issue. made change https://review.openstack.org/#/c/632632/ to remove '--no-cache-dir' , tox and zuul passed. Thanks. BR Austin Sun. From: Penney, Don [mailto:Don.Penney@windriver.com] Sent: Wednesday, January 23, 2019 6:02 AM To: starlingx-discuss@lists.starlingx.io Subject: Re: [Starlingx-discuss] Heads up about probable failing tox and zuul Note that this also impacts loci docker image builds. From: Bailey, Henry Albert (Al) [mailto:Al.Bailey@windriver.com] Sent: Tuesday, January 22, 2019 4:56 PM To: starlingx-discuss@lists.starlingx.io<mailto:starlingx-discuss@lists.starlingx.io> Subject: [Starlingx-discuss] Heads up about probable failing tox and zuul About 3 hours ago a new version of Pip was released to the pypi site. https://pypi.org/project/pip/19.0/ Tox jobs which pick up that version of pip will likely fail to install their dependencies. Docker image jobs that are using loci (which uses pip) have also been observed to fail. I don't know what the fix is, I assume many python users in many projects will be impacted. If you see an error with a signature like this, you've hit the problem Exception: Traceback (most recent call last): File "/var/lib/openstack/lib/python2.7/site-packages/pip/_internal/cli/base_command.py", line 176, in main status = self.run(options, args) File "/var/lib/openstack/lib/python2.7/site-packages/pip/_internal/commands/install.py", line 346, in run session=session, autobuilding=True File "/var/lib/openstack/lib/python2.7/site-packages/pip/_internal/wheel.py", line 848, in build assert building_is_possible AssertionError Al