[Train] podman image prune -a -f: option -f not recognized

[Jose Luis Franco]

It has been observed in some of the minor update jobs from Train the following failing task:

2020-10-01 10:27:27,042 p=46659 u=mistral n=ansible | TASK [Purge Podman] ************************************************************
2020-10-01 10:27:27,042 p=46659 u=mistral n=ansible | Thursday 01 October 2020 10:27:27 +0000 (0:00:00.275) 2:45:50.769 ******
2020-10-01 10:27:27,315 p=46659 u=mistral n=ansible | TASK [tripleo-podman : Clean podman images] ************************************
2020-10-01 10:27:27,316 p=46659 u=mistral n=ansible | Thursday 01 October 2020 10:27:27 +0000 (0:00:00.273) 2:45:51.043 ******
2020-10-01 10:27:27,686 p=46659 u=mistral n=ansible | fatal: [controller-2]: FAILED! => {"changed": true, "cmd": ["podman", "image", "prune", "-a", "-f"], "delta": "0:00:00.065628", "end": "2020-10-01 10:27:27.651327", "msg": "non-zero return code", "rc": 125, "start": "2020-10-01 10:27:27.585699", "stderr": "Error: unknown shorthand flag: 'f' in -f", "stderr_lines": ["Error: unknown shorthand flag: 'f' in -f"], "stdout": "", "stdout_lines": []}

[heat-admin@controller-0 ~]$ sudo rpm -qa | grep podman
podman-docker-1.6.4-16.module+el8.2.0+7659+b700d80e.noarch
podman-1.6.4-16.module+el8.2.0+7659+b700d80e.x86_64

Right DNF stream configured:

[heat-admin@controller-0 ~]$ sudo dnf module list
Updating Subscription Management repositories.
Unable to read consumer identity
/usr/lib/python3.6/site-packages/dateutil/parser/_parser.py:70: UnicodeWarning: decode() called on unicode string, see https://bugzilla.redhat.com/show_bug.cgi?id=1693751
  instream = instream.decode()

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rhel8 appstream
Name Stream Profiles Summary
389-ds 1.4 389 Directory Server (base)
ant 1.10 [d] common [d] Java build tool
container-tools rhel8 [d] common [d] Common tools and dependencies for container runtimes
container-tools 1.0 common [d] Common tools and dependencies for container runtimes
container-tools 2.0 [e] common [d] Common tools and dependencies for container runtimes

It looks like the -f flag was included in podman 2.0 so some logic should be added to catch if the -f flag needs to be added or not.

[Jose Luis Franco (jfrancoa)]

The task fails, but there is a rescue block which will run the command without -f if the flag isn't supported:

- name: Podman image prune
  become: true
  block:
    - name: Clean podman images
      command: podman image prune -a -f
  rescue:
    # In case -f isn't available yet, we fallback to old way.
    # https://bugs.launchpad.net/tripleo/+bug/1889418
    - name: Clean podman images
      command: podman image prune -a

https://github.com/openstack/tripleo-ansible/commit/f9b89173307bd6e8495c757c098c3dda01f8c822

Close it as not a bug.