Missing User TSS form nova-compute image

[Sunil Kumar K C]

Kolla version: stable/2023.2 (probably impact other Kolla versions)
OS version: Ubuntu 22.04.4 (probably impact other OS distributions)

Hi,
We were testing TPM support on Kolla-Ansible Openstack, downloaded new image with swtpm and swtpm_tools, fixed in bug https://bugs.launchpad.net/kolla/+bug/2062572.

we ran into error "KeyError: "getpwnam(): name not found: 'tss'"

LOGS:
2024-05-24 06:02:00.191 2 ERROR oslo_service.service [None req-c209a50d-b6a8-4e4e-836e-3f124b1q1e34t - - - - - -] Error starting thread.: nova.exception.InvalidConfiguration: The user configured in '[libvirt] swtpm_user' does not exist on this host; expected 'tss'.
2024-05-24 06:02:00.191 2 ERROR oslo_service.service Traceback (most recent call last):
2024-05-24 06:02:00.191 2 ERROR oslo_service.service File "/var/lib/kolla/venv/lib/python3.10/site-packages/nova/virt/libvirt/driver.py", line 1077, in _check_vtpm_support
2024-05-24 06:02:00.191 2 ERROR oslo_service.service pwd.getpwnam(CONF.libvirt.swtpm_user)
2024-05-24 06:02:00.191 2 ERROR oslo_service.service KeyError: "getpwnam(): name not found: 'tss'"
2024-05-24 06:02:00.191 2 ERROR oslo_service.service
2024-05-24 06:02:00.191 2 ERROR oslo_service.service During handling of the above exception, another exception occurred:
2024-05-24 06:02:00.191 2 ERROR oslo_service.service
2024-05-24 06:02:00.191 2 ERROR oslo_service.service Traceback (most recent call last):
2024-05-24 06:02:00.191 2 ERROR oslo_service.service File "/var/lib/kolla/venv/lib/python3.10/site-packages/oslo_service/service.py", line 806, in run_service
2024-05-24 06:02:00.191 2 ERROR oslo_service.service service.start()
2024-05-24 06:02:00.191 2 ERROR oslo_service.service File "/var/lib/kolla/venv/lib/python3.10/site-packages/nova/service.py", line 162, in start
2024-05-24 06:02:00.191 2 ERROR oslo_service.service self.manager.init_host(self.service_ref)
2024-05-24 06:02:00.191 2 ERROR oslo_service.service File "/var/lib/kolla/venv/lib/python3.10/site-packages/nova/compute/manager.py", line 1610, in init_host
2024-05-24 06:02:00.191 2 ERROR oslo_service.service self.driver.init_host(host=self.host)
2024-05-24 06:02:00.191 2 ERROR oslo_service.service File "/var/lib/kolla/venv/lib/python3.10/site-packages/nova/virt/libvirt/driver.py", line 850, in init_host
2024-05-24 06:02:00.191 2 ERROR oslo_service.service self._check_vtpm_support()
2024-05-24 06:02:00.191 2 ERROR oslo_service.service File "/var/lib/kolla/venv/lib/python3.10/site-packages/nova/virt/libvirt/driver.py", line 1082, in _check_vtpm_support
2024-05-24 06:02:00.191 2 ERROR oslo_service.service raise exception.InvalidConfiguration(msg % CONF.libvirt.swtpm_user)
2024-05-24 06:02:00.191 2 ERROR oslo_service.service nova.exception.InvalidConfiguration: The user configured in '[libvirt] swtpm_user' does not exist on this host; expected 'tss'.
2024-05-24 06:02:00.191 2 ERROR oslo_service.service

Nova compute fails to start because of this.

Fix is to ensure user tss is created like below

tss:x:115:115:TPM software stack,,,:/var/lib/tpm:/bin/false