Comment 3 for bug 1995778

Hi Przemyslaw

Well, that was a convoluted bug, but I've worked out what's going on. Basically, the bug is in nova-cloud-controller and not nova-compute, specifically in the bit where it sets the api_version on the relation between nova-cloud-controller and nova-compute.

In nova-cloud-controller in hooks/nova_cc_hooks.py in `def auth_token_config()` the the api_version is read from the /etc/nova/api-paste.ini file, which is called from `def _auth_config()` called from `def keystone_compute_settings()` which is called ultimately and set on the relation in `def cloud_compute_relation_changed()`.

All would be good, but sadly the 'api_version' key doesn't appear in the relevant section of the /etc/nova/api-paste.ini file which is in `templates/mitaka/api-paste.ini`.

The fix is probably going to be to just add `api_version` to the ./api-paste.ini template, but it needs to be checked that this is a valid field, etc.

I'll change the bug to nova-cloud-controller, and remove it from nova-compute.