Reboot hosts after changed sources list and dist-upgrade when system is...

Reboot hosts after changed sources list and dist-upgrade when system is systemd-booted ( e.g. not running in a podman container )

tasks/main.yml

 ---
+#### CLEANUP
+
+#### SOURCES
+
 - name: Set current debian stable sources list at /etc/apt/sources.list
-  copy:
+  ansible.builtin.copy:
     dest: /etc/apt/sources.list
     owner: root
     group: root
@@ -11,18 +15,57 @@
       deb http://ftp.at.debian.org/debian/ bullseye-backports main contrib non-free
   register: stable_sources_list
 
-- name: Update the packagecache and perform a safe upgrade on non-changed sources list
-  when: ( stable_sources_list is succeeded ) and ( not stable_sources_list.changed ) 
-  apt:
+- name: Set current debian stable preferences list
+  ansible.builtin.copy:
+    dest: /etc/apt/preferences
+    owner: root
+    group: root
+    mode: u=rw,o=rx,g=r
+    content: |
+      Package: *
+      Pin: release n=bullseye
+      Pin-Priority: 991
+      Package: *
+      Pin: release n=bullseye-updates
+      Pin-Priority: 992
+      Package: *
+      Pin: release n=bullseye-backports
+      Pin-Priority: 990
+
+#### INSTALL, UPGRADE
+
+
+- name: Update the packagecache and perform a safe upgrade on non-changed sources list for Ansible version < 2.12
+  when: ( ansible_version.full < "2.12"  ) and ( stable_sources_list is succeeded ) and ( not stable_sources_list.changed ) 
+  ansible.builtin.apt:
+    update_cache: yes
+    upgrade: yes
+    autoremove: yes
+    autoclean: yes
+    force: yes
+
+- name: Update the packagecache and perform a safe upgrade on non-changed sources list for Ansible version >= 2.12
+  when: ( ansible_version.full >= "2.12" ) and ( stable_sources_list is succeeded ) and ( not stable_sources_list.changed ) 
+  ansible.builtin.apt:
     update_cache: yes
     upgrade: yes
     autoremove: yes
     autoclean: yes
     allow_downgrade: yes
 
-- name: Update the packagecache and perform a dist upgrade on changed sources list
-  when: stable_sources_list.changed
-  apt:
+- name: Update the packagecache and perform a dist upgrade on changed sources list for Ansible version < 2.12
+  when: (stable_sources_list.changed) and (ansible_version.full < "2.12")
+  ansible.builtin.apt:
+    update_cache: yes
+    upgrade: dist
+    autoremove: yes
+    autoclean: yes
+    force: yes
+  register: dist_upgrade
+
+- name: Update the packagecache and perform a dist upgrade on changed sources list for Ansible version >= 2.12
+  when: (stable_sources_list.changed) and (ansible_version.full >= "2.12")
+  ansible.builtin.apt:
     update_cache: yes
     upgrade: dist
     autoremove: yes
@@ -30,8 +73,9 @@
     allow_downgrade: yes
   register: dist_upgrade
 
-- name: Reboot hosts after changed sources list and dist-upgrade
-  when: ( stable_sources_list.changed ) and ( dist_upgrade.changed )
+- name: Reboot hosts after changed sources list and dist-upgrade when system is systemd-booted ( e.g. not running in a podman container )
+  when: ( ansible_service_mgr == 'systemd' ) and ( stable_sources_list.changed ) and ( dist_upgrade.changed )
   ansible.builtin.reboot:
     reboot_timeout: 1200
 
+#### INIT