Should automation developers be starting with role-only collections?

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I didn’t know the answer to this, so I asked Codex to check the molecule source:

The relevant flow is:

  • get_configs() discovers molecule.yml files with wcmatch.glob() in src/molecule/command/base.py:490-529.
  • Scenarios.all then sorts the resulting scenarios with:
    scenarios.sort(key=lambda x: x.directory)

So with this layout:

molecule/reverse1/molecule.yml
molecule/reverse2/molecule.yml

Molecule will process:

reverse1
reverse2

The existing test tests/unit/test_scenarios_ordered.py:30-63 confirms this behavior. It supplies configurations in the order two, one, three, but uses directories named 01_foo, 02_foo, and 03_foo. Molecule returns them as one, two, three, based on directory order.

Here is an example with shared_state: true and using uv run tox --ansible -e molecule-py3.12-2.19 - the scenario sequence is that default -> create runs first, then all the scenario specific sequences, then finally default -> destroy:

DETAILS                                                                        
default ➜ create: Executed: Successful

agent_airgap ➜ prepare: Executed: Successful
agent_airgap ➜ converge: Executed: Successful
agent_airgap ➜ cleanup: Executed: Successful

agent_default ➜ prepare: Executed: Successful
agent_default ➜ converge: Executed: Successful
agent_default ➜ cleanup: Executed: Successful

agent_token ➜ prepare: Executed: Successful
agent_token ➜ converge: Executed: Successful
agent_token ➜ cleanup: Executed: Successful

hub_default ➜ converge: Executed: Successful
hub_default ➜ verify: Executed: Successful
hub_default ➜ cleanup: Executed: Successful

default ➜ destroy: Executed: Successful

SCENARIO RECAP                                                                 
default                   : actions=1  successful=1  disabled=0  skipped=0  missing=0  failed=0
agent_airgap              : actions=3  successful=3  disabled=0  skipped=0  missing=0  failed=0
agent_default             : actions=3  successful=3  disabled=0  skipped=0  missing=0  failed=0
agent_token               : actions=3  successful=3  disabled=0  skipped=0  missing=0  failed=0
hub_default               : actions=3  successful=3  disabled=0  skipped=0  missing=0  failed=0
default                   : actions=1  successful=1  disabled=0  skipped=0  missing=0  failed=0

  molecule-py3.12-2.19: OK (241.33=setup[0.01]+cmd[4.79,73.05,163.48] seconds)
  congratulations :) (241.80 seconds)

I don’t think that is possible with molecule as is today.

1 Like
22

Thank you for the answer.