CI runs started failing on ansible devel install due to new installation warning

[geerlingguy]

SUMMARY

CI test runs are now failing on the molecule job with the following:

    RuntimeError:

        ****************************************************************************

        Cannot install ansible-base with a pre-existing ansible==2.9.10
        installation.

        Installing ansible-base with ansible-2.9 or older currently installed with
        pip is known to cause problems. Please uninstall ansible and install the new
        version:

            pip uninstall ansible
            pip install ansible-base

        If you want to skip the conflict checks and manually resolve any issues
        afterwards, set the ANSIBLE_SKIP_CONFLICT_CHECK environment variable:

            ANSIBLE_SKIP_CONFLICT_CHECK=1 pip install ansible-base
        ****************************************************************************

ISSUE TYPE

• Bug Report

COMPONENT NAME

CI - GitHub Actions

ANSIBLE VERSION

ansible-base

CONFIGURATION

N/A

OS / ENVIRONMENT

N/A

STEPS TO REPRODUCE

Look at CI builds: https://github.com/ansible-collections/community.kubernetes/runs/891624024?check_suite_focus=true

EXPECTED RESULTS

N/A

ACTUAL RESULTS

N/A

[geerlingguy]

Hmm... it seems that molecule is requiring a 'stable' version of Ansible, and not detecting that ansible base 2.11.0 meets that requirement?

Collecting ansible>=2.8
  Downloading ansible-2.9.10.tar.gz (14.2 MB)

See: https://github.com/ansible-collections/community.kubernetes/pull/168/checks?check_run_id=891671654#step:6:39

This is causing a new error since ansible-base was installed but Pip installed ansible-2.9.10 on top of it when installing molecule:

ERROR! Unexpected Exception, this is probably a bug: cannot import name 'AnsibleCollectionLoader' from 'ansible.utils.collection_loader' (/opt/hostedtoolcache/Python/3.7.8/x64/lib/python3.7/site-packages/ansible/utils/collection_loader/__init__.py)

[geerlingguy]

Well, after manually uninstalling and reinstall ansible, I get the following from Molecule:

pkg_resources.DistributionNotFound: The 'ansible' distribution was not found and is required by the application

[geerlingguy]

Opened an upstream issue: ansible/molecule#2757

[geerlingguy]

Fix for now is to stick with stable Ansible 2.9.x, unfortunately... we'll switch back to base once the molecule issue linked above is fixed.