- name: System update
  pacman:
    update_cache: yes
    upgrade: yes
- name: Install common packages
  pacman:
    name: "{{ common_packages }}"
  when:
    - common_packages is defined
    - common_packages is truthy
- name: Install host-specific packages
  pacman:
    name: "{{ host_packages }}"
  when:
    - host_packages is defined
    - host_packages is truthy