Action Plugin _execute_module fails with "missing interpreter line"

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1

I’m trying to create an action plugin, and I’ve simplified it to a very basic demonstration of this issue. When my action module calls another module with self._execute_module, the task fails reporting that the module being called is missing interpreter line. Here’s a minimal example:

action_plugins/basic.py

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from ansible.plugins.action import ActionBase


class ActionModule(ActionBase):
    def __init__(self, *args, **kwargs):
        super(ActionModule, self).__init__(*args, **kwargs)

    def run(self, tmp=None, task_vars=None):
        super(ActionModule, self).run(tmp, task_vars)
        return self._execute_module(
            module_name='ansible.builtin.debug',
            module_args={'msg': 'testing'},
            task_vars=task_vars,
        )

test_task.yml

- name: Test action module
  gather_facts: false
  hosts: localhost
  tasks:
    - name: Test action module
      basic: {}

And when running this basic task, I get the failure:

fatal: [localhost]: FAILED! => {
    "msg": "module (ansible.builtin.debug) is missing interpreter line"
}

I’ve tried different shebang options in my action plugin with no changes. The error seems to originate from here, but I’m sure there’s more going on here than I understand, cause this line seems to be looking for a shebang, but none of the built in modules have shebangs.

I’m really at a loss for what’s going on here.

2

ansible.builtin.debug is not a module, it is an action plugin. Try executing an actual module, like ansible.builtin.ping.

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