docker_compose(role): use community.docker.docker_compose_v2 module

Use the community.docker.docker_compose_v2 module as it supports proper
changed handling out of the box, making the roles code more
straightforward and work. Also just do a docker compose restart instead
of having the custom docker compose reload script.

https://docs.ansible.com/ansible/latest/collections/community/docker/docker_compose_v2_module.html

roles/docker_compose/defaults/main.yaml

@@ -1,2 +1 @@
 docker_compose__configuration_files: [ ]
-docker_compose__restart_cmd: ""

roles/docker_compose/handlers/main.yaml

@@ -1,13 +1,11 @@
 - name: docker compose down
-  ansible.builtin.command:
-    cmd: /usr/bin/docker compose down
-    chdir: /ansible_docker_compose
+  community.docker.docker_compose_v2:
+    project_src: /ansible_docker_compose
+    state: absent
   become: true
-  changed_when: true  # This is always changed.
-- name: docker compose reload script
-  ansible.builtin.command:
-    cmd: /usr/bin/docker compose {{ docker_compose__restart_cmd }}
-    chdir: /ansible_docker_compose
+
+- name: docker compose restart
+  community.docker.docker_compose_v2:
+    project_src: /ansible_docker_compose
+    state: restarted
   become: true
-  changed_when: true  # Mark this as always changed (for now?).
-  when: docker_compose__restart_cmd != ""

roles/docker_compose/tasks/main.yaml

@@ -59,7 +59,7 @@
     state: absent
   become: true
   loop: "{{ docker_compose__config_files_to_remove.files }}"
-  # notify: docker compose down
+  notify: docker compose restart
 
 - name: make sure all given configuration files are deployed
   ansible.builtin.copy:
@@ -70,45 +70,19 @@
     group: root
   become: true
   loop: "{{ docker_compose__configuration_files }}"
-  # notify: docker compose down
-  notify: docker compose reload script
+  notify: docker compose restart
 
-- name: Flush handlers to make "docker compose down" handler run now
+- name: Flush handlers to make "docker compose down" and "docker compose restart" handlers run now
   ansible.builtin.meta: flush_handlers
 
-- name: docker compose ps --format json before docker compose up
-  ansible.builtin.command:
-    cmd: /usr/bin/docker compose ps --format json
-    chdir: /ansible_docker_compose
+- name: docker compose up
+  community.docker.docker_compose_v2:
+    project_src: /ansible_docker_compose
+    state: present
+    build: always
+    pull: always
+    remove_orphans: true
   become: true
-  changed_when: false
-  register: docker_compose__ps_json_before_up
-
-- name: docker compose up --detach --pull always --build
-  ansible.builtin.command:
-    cmd: /usr/bin/docker compose up --detach --pull always --build --remove-orphans
-    chdir: /ansible_docker_compose
-  become: true
-  changed_when: false
-  # The changed for this task is tried to be determined by the "potentially
-  # report changed" task together with the "docker compose ps --format json
-  # [...]" tasks.
-
-- name: docker compose ps --format json after docker compose up
-  ansible.builtin.command:
-    cmd: /usr/bin/docker compose ps --format json
-    chdir: /ansible_docker_compose
-  become: true
-  changed_when: false
-  register: docker_compose__ps_json_after_up
-
-# Doesn't work anymore. Dunno why.
-# TODO: Fix
-# - name: potentially report changed
-#   ansible.builtin.debug:
-#     msg: "If this reports changed, then the docker compose containers changed."
-#   changed_when: (docker_compose__ps_json_before_up.stdout | from_json | community.general.json_query('[].ID') | sort)
-#                 != (docker_compose__ps_json_after_up.stdout | from_json | community.general.json_query('[].ID') | sort)
 
 - name: Make sure anacron is installed
   become: true