# NB: We use `virsh` here instead of the `virt` module because
# these tasks may be called before the dependencies of the `virt`
# module are satisfied.

- name: Check if libvirt is available
  command: >
    virsh uri
  ignore_errors: true
  changed_when: false
  register: libvirt_check
  environment:
    LIBVIRT_DEFAULT_URI: "{{ libvirt_uri }}"

# If libvirt isn't available we can skip everything else.
- when: libvirt_check is success
  environment:
    LIBVIRT_DEFAULT_URI: "{{ libvirt_uri }}"
  block:

    - when: vm_nodes
      block:

        # Check if the vm nodes exist.
        - name: Check vm vms
          command: >
            virsh domid "{{ item.name }}"
          with_items: "{{ vm_nodes }}"
          ignore_errors: true
          register: vm_check

        # Destroy and undefine the vm nodes.
        - name: Destroy vm vms
          command:
            virsh destroy "{{ item.item.name }}"
          when: item is success
          with_items: "{{ vm_check.results }}"
          ignore_errors: true

        - name: Undefine vm vms
          command:
            virsh undefine "{{ item.item.name }}"
          when: item is success
          with_items: "{{ vm_check.results }}"

        # The `virsh vol-dumpxml ... > /dev/null` is here (and elsewhere) due to
        # [1293804].
        #
        # [1293804]: https://bugzilla.redhat.com/show_bug.cgi?id=1293804
        - name: Delete baremetal vm storage
          shell: |
            virsh vol-dumpxml --pool '{{ libvirt_volume_pool }}' \
              '{{ item.name }}'.qcow2 2>&1 > /dev/null
            virsh vol-delete --pool '{{ libvirt_volume_pool }}' \
              '{{ item.name }}'.qcow2
          with_items: "{{ vm_nodes }}"
          ignore_errors: true

    - name: Check volume pool
      command: >
        virsh pool-uuid "{{ libvirt_volume_pool }}"
      register: pool_check
      ignore_errors: true

    # See https://www.redhat.com/archives/libvirt-users/2016-March/msg00123.html
    # TL;DR: ensure that the pool really exists if the previous
    # task says it does.
    - name: Work around libvirt bug
      shell: |
        virsh pool-dumpxml "{{ libvirt_volume_pool }}" |
        virsh pool-define /dev/stdin
      when: pool_check is success

    - name: Destroy volume pool
      command: >
        virsh pool-destroy "{{ libvirt_volume_pool }}"
      when: pool_check is success
      ignore_errors: true

    - name: Undefine volume pool
      command: >
        virsh pool-undefine "{{ libvirt_volume_pool }}"
      when: pool_check is success

    - name: Get UID of pool user
      command: id -u "{{ ansible_user_id }}"
      register: pool_uid
      changed_when: false
      when: pool_check is success

    - name: Destroy pool definition file
      file:
        path: "/run/user/{{ pool_uid.stdout }}/libvirt/storage/run/{{ libvirt_volume_pool }}.xml"
        state: absent
      when: pool_check is success