Ansible Bugreport 36243 - https://github.com/ansible/ansible/issues/36243

.gitignore

.Python
bin/
include/
lib/
pip-selfcheck.json
playbook.retry

build.sh

#!/usr/bin/env sh
docker build --tag childnode/bugreport-ansible-docker-container:latest -f Dockerfile $(dirname $0)/

Dockerfile

FROM alpine

hosts

[localhost]
127.0.0.1

playbook.yml

---
- name: "Bugreport 36243 - https://github.com/ansible/ansible/issues/36243"
  connection: local
  hosts: localhost
  vars:
    dstate: "{{state | default('started')}}"
    env: { foo: 'bar', bar: 'foo', baz: 'zap' }
  tasks:
  - name: "inspect env for container has been changed {{result.changed}}"
    local_action: shell {% raw %}docker inspect de.childno.bugreport.ansible-docker-container -f '{{.Config.Env}}'{% endraw %}
    register: inspected
  - name: "start container {{dstate}} with {{env}}"
    docker_container:
      name: "de.childno.bugreport.ansible-docker-container"
      hostname: "de.childno.bugreport.ansible-docker-container"
      image: "childnode/bugreport-ansible-docker-container:latest"
      state: "{{dstate}}"
      #restart: "omit"
      #recreate: "omit"
      pull: "false"
      restart_policy: "unless-stopped"
      # restart_retries: "omit"
      # volumes: "omit"
      # published_ports: "omit"
      # exposed_ports: "omit"
      env: '{{env}}'
      # env_file: "omit"
      # log_driver: "json-file"
      # log_options: "{'max-file': '3','max-size': '200m'}"
      # network_mode: "bridge"
      # keep_volumes: "false"
      # command: "omit"
      # etc_hosts: "omit"
      # user: "omit"
      # privileged: "omit"
    register: result
  - debug:
      msg:
        - "was:"
        - "{{inspected.stdout}}"
        - "is now:"
        - "{{result.ansible_facts.docker_container.Config.Env}}"
        - "expected to match applied:"
        - "{{env}}"
...

start.sh

#!/usr/bin/env sh
ansible-playbook playbook.yml --list-hosts
ansible-playbook playbook.yml -e state=present
ansible-playbook playbook.yml
#docker inspect de.childno.bugreport.ansible-docker-container -f "{{.Config.Env}}"

echo "show nothing changes if we do present again"
ansible-playbook playbook.yml -e state=present
#docker inspect de.childno.bugreport.ansible-docker-container -f "{{.Config.Env}}"

echo "show nothing changes if we start with different env, only containing one of the three envs defined before"
ansible-playbook playbook.yml -v -e '{"env": {foo: bar}}'
#docker inspect de.childno.bugreport.ansible-docker-container -f "{{.Config.Env}}"

echo "show changes if we start with different env, containing a different than one of the three envs defined before"
ansible-playbook playbook.yml -e '{"env": {changed: me}}'
#docker inspect de.childno.bugreport.ansible-docker-container -f "{{.Config.Env}}"