---

- name: Obtain current state of swap
  command: swapon --noheadings --show=NAME
  register: swapon

- name: Setup swap if none already, to prevent kernel firing off the OOM killer
  block:

    - name: A unique swapfile path is generated
      command: mktemp --tmpdir=/root swapfile_XXX
      register: swapfilepath

    - name: Swap file path is buffered
      set_fact:
        swapfilepath: '{{ swapfilepath.stdout | trim }}'

    - name: Set swap file permissions
      file:
        path: "{{ swapfilepath }}"
        owner: root
        group: root
        mode: 0600

    - name: Swapfile padded to swapfile_size & timed to help debug any performance problems
      shell: 'time dd if=/dev/zero of={{ swapfilepath }} bs={{ swapfileGB }}M count=1024'

    - name: Swap file is formatted
      command: 'mkswap {{ swapfilepath }}'

    - name: Write swap entry in fstab
      mount:
        path: none
        src: "{{ swapfilepath }}"
        fstype: swap
        opts: sw
        state: present

    - name: Mount swap
      command: "swapon -a"

  when: not (swapon.stdout_lines | length)