utils-debian11to12.yml

- name: check if host is already running the target distribution
  debug:
    msg: "Host is already running Debian 12. Nothing to do."
  when: ansible_facts.distribution_release == "bookworm"

- name: upgrade Debian 11 to 12
  when: ansible_facts.distribution_release == "bullseye"
  block:
    - name: update apt cache
      apt:
        update_cache: yes
    - name: upgrade all packages to latest versions (safe-upgrade) # noqa no-changed-when command-instead-of-module
      command:
        cmd: apt-get -y upgrade
      environment:
        DEBIAN_FRONTEND: noninteractive
    - name: list APT sources configuration files
      find:
        path: /etc/apt/sources.list.d/
        patterns: '*.list'
      register: common_apt_sources_files
    - name: replace bullseye with bookworm in APT sources list
      replace:
        path: "{{ item }}"
        regexp: "bullseye"
        replace: "bookworm"
      with_items: "{{ common_apt_sources_files.files | map(attribute='path') | list + ['/etc/apt/sources.list'] }}"
    - name: update apt cache
      apt:
        update_cache: yes
    - name: upgrade all packages to latest versions (dist-upgrade) # noqa no-changed-when command-instead-of-module
      command:
        cmd: apt-get -y dist-upgrade
      environment:
        DEBIAN_FRONTEND: noninteractive
    - name: reboot host
      reboot:
        reboot_timeout: 6000
    - name: show upgrade completion message
      debug:
        msg: "Upgrade to Debian 12 complete. Please run the playbook against this host to apply up-to-date configuration for Debian 12."