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- name: Upgrade packages or fail gracefully
  become: true
  block:
    - name: Upgrade packages
      community.general.pacman:
        update_cache: true
        upgrade: true
      register: pacman_result
      notify: pacman_upgraded

    - name: Reboot if necessary
      ansible.builtin.meta: flush_handlers
  rescue:
    - name: Check if /etc is versioned
      ansible.builtin.file:
        path: /etc/.git/config
        state: file
      register: etc_versioned

    - name: Fail if /etc is not versioned
      ansible.builtin.fail:
        msg: Upgrading packages failed for an unknown reason!
      when: not etc_versioned

    - name: Check for changes in /etc
      ansible.builtin.command: git status --porcelain=v1
      args:
        chdir: /etc
      register: git_status
      changed_when: false

    - name: Fail if there're no uncommitted changes in /etc
      ansible.builtin.fail:
        msg: Upgrading packages failed for an unknown reason!
      when: not git_status.stdout

    - name: All changes in /etc are in pacman.d/gnupg?
      ansible.builtin.shell: |
        set -o pipefail && \
        git status --porcelain=v1 \
            | cut -c 4- \
            | grep -G -v '^pacman.d/gnupg/'
      args:
        chdir: /etc
      register: only_gnupg
      changed_when: false
      failed_when: only_gnupg.rc not in [0, 1]

    - name: Commit changes in /etc/pacman.d/gnupg
      ansible.builtin.command: |
        etckeeper commit 'pacman: GPG keys'
      when: only_gnupg.rc == 1

    - name: Retry upgrading packages
      community.general.pacman:
        update_cache: true
        upgrade: true
      register: pacman_result
      notify: pacman_upgraded

    - name: Reboot if necessary
      ansible.builtin.meta: flush_handlers