Hello,
I have had some local discussions with gmann, but I'd really like to move this discussion forward to fix the broken stable/xena gate in heat so I will start this thread, hoping the thread can provide more context behind my proposal.
Historically stable branches of heat have been frequently affected by any change in requirements of tempest. This is mainly because in our CI we install our own in-tree integration tests[1] into tempest venv where tempest and heat-tempest-plugin are installed. Because in-tree integration tests are tied to that specific stable branch, this has been often causing conflicts in requirements (master constraint vs stable/X constraint).
[1] https://github.com/openstack/heat/tree/master/heat_integrationtests
In the past we changed our test installation[2] to use stable constraint to avoid this conflicts, but this approach does no longer work since stable/xena because
1. stable/xena u-c no longer includes tempest
2. latest tempest CAN'T be installed with stable/xena u-c because current tempest requires fasteners>=0.16.0 which conflicts with 0.14.1 in stable/xena u-c.
[2] https://review.opendev.org/c/openstack/heat/+/803890 https://review.opendev.org/c/openstack/heat/+/848215
I've proposed the change to pin tempest[3] in stable/xena u-c so that people can install tempest with stable/xena u-c. [3] https://review.opendev.org/c/openstack/requirements/+/878228
I understand the reason tempest was removed from u-c was that we should use the latest tempest to test recent stable releases.I agree we can keep tempest excluded for stable/yoga and onwards because tempest is installable with their u-c, but stable/xena u-c is no longer compatible with master. Adding pin to xena u-c does not mainly affect the policy to test stable branches with latest tempest because for that we anyway need to use more recent u-c.
I'm still trying to find out the workaround within heat but IMO adding tempest pin to stable/xena u-c is harmless but beneficial in case anyone is trying to use tempest with stable/xena u-c.
Thank you, Takashi Kajinami