---
# Tasks to validate swapfile management (enabling/disabling its use) on FreeBSD.
# The swapfile MUST be associated to a memory disk, that becomes the 'src'.

- name: Swap off all (try to cleanup previous erraneous tests)
  command:
    cmd: swapoff -a


- name: Try to activate swapfile
  vars:
    swapfile: /var/swapfile0
    md_unit: 99
    md_name: "md{{ md_unit }}"
    md_path: "/dev/{{ md_name }}"

  block:
    - name: Create a file to be used for memory swapping
      command:
        cmd: "dd if=/dev/zero of={{ swapfile }} bs=1M count=64"
        creates: "{{ swapfile }}"

    - name: Setup permissions suitable for swap usage
      file:
        path: "{{ swapfile }}"
        mode: u=rw,go=
        state: file

    - name: Attach a memory disk to the swap file
      command:
        cmd: "mdconfig -a -t vnode -u {{ md_unit }} -f {{ swapfile }}"
        creates: "{{ md_path }}"


    - name: Get swap info (0)
      command: swapctl -l
      register: swap_info_0
      changed_when: false

    - name: Assert that memory disk {{ md_path }} is not used by swap
      assert:
        that:
          - swap_info_0.stdout is not search(md_path)

    - name: Enable swap file
      mount:
        path: none
        src: "{{ md_name }}"
        fstype: swap
        opts: "sw,file={{ swapfile }}"
        state: mounted
      register: swap_enabled_1

    - name: Get swap info (1)
      command: swapctl -l
      register: swap_info_1
      changed_when: false

    - name: Assert that swap file is enabled
      assert:
        that:
          - swap_enabled_1 is changed
          - swap_info_1.stdout is search(md_path)


    - name: Enable swap file, again
      mount:
        path: none
        src: "{{ md_name }}"
        fstype: swap
        opts: "sw,file={{ swapfile }}"
        state: mounted
      register: swap_enabled_2

    - name: Get swap info (2)
      command: swapctl -l
      register: swap_info_2
      changed_when: false

    - name: Assert that nothing changed
      assert:
        that:
          - swap_enabled_2 is not changed
          - swap_info_2.stdout == swap_info_1.stdout

  always:
    - name: Disable swap file
      mount:
        path: none
        src: "{{ md_name }}"
        fstype: swap
        state: absent
      register: swap_disabled_1

    - name: Get swap info (3)
      command: swapctl -l
      register: swap_info_3
      changed_when: false

    - name: Assert that swap file is disabled
      assert:
        that:
          - swap_disabled_1 is changed
          - swap_info_3.stdout == swap_info_0.stdout

    - name: Disable swap file, again
      mount:
        path: none
        src: "{{ md_name }}"
        fstype: swap
        state: absent
      register: swap_disabled_2

    - name: Get swap info (4)
      command: swapctl -l
      register: swap_info_4
      changed_when: false

    - name: Assert that swap file is disabled and nothing changed
      assert:
        that:
          - swap_disabled_2 is not changed
          - swap_info_4.stdout == swap_info_3.stdout


    - name: Detach memory disk
      command:
        cmd: "mdconfig -d -u {{ md_unit }}"
        removes: "{{ md_path }}"

    - name: Remove swap file
      file:
        path: "{{ swapfile }}"
        state: absent


- name: Swap on all (try to restore pre-test state)
  command:
    cmd: swapon -a