---

- name: "Add a swap file of {{ swap_file_size }} MBytes"
  become: true
  become_user: root
  shell:
    cmd: |
      # does the swap file already exist?
      if grep -q "swapfile" /etc/fstab; then
        echo 'swapfile found. No changes made.'
        exit 0
      fi

      echo 'swapfile not found. Adding swapfile...'
      set -ex

      fallocate -l '{{ swap_file_size }}M' /swapfile
      chmod 600 /swapfile
      mkswap /swapfile
      swapon /swapfile
      echo '/swapfile none swap defaults 0 0' >> /etc/fstab
      echo 'swapfile added.'
      exit 0

  register: add_swap_file
  changed_when: >-
    'swapfile added' in add_swap_file.stdout