- name: "QCOW | Enabling nbd kernel module"
  command: modprobe nbd

- name: "QCOW | 3 second pause after loading nbd kernel module"
  pause:
    seconds: 3

- name: "QCOW | Finding availible NBD device to use"
  shell:
    executable: /bin/bash
    cmd: |
        for dev in /sys/class/block/nbd*; do
          size="$(cat "$dev"/size)"
          device="/dev/nbd${dev: -1}"
          if (( size == 0 )) && ! ls ${device}p* >& /dev/null; then
            printf "%s" "$device"
            exit 0
          fi
        done
        # NOTE: if we have got this far, then we have not been able to find a suitable nbd device to consume.
        exit 1
  register: role_img_nbd_device

- name: "QCOW | Creating build directory"
  file:
    state: directory
    path: "{{ nbd_build_dir }}"

- name: "QCOW | Creating QCoW2"
  command: qemu-img create -f qcow2 {{ nbd_build_dir }}/{{ img_name }} {{ qcow_capacity }}

- name: "QCOW | Connecting QCoW2 to {{ role_img_nbd_device.stdout }}"
  command: qemu-nbd --connect={{ role_img_nbd_device.stdout }} {{ nbd_build_dir }}/{{ img_name }}

- name: "QCOW | Store NBD device"
  copy:
    content: "{{ role_img_nbd_device.stdout }}"
    dest: /tmp/nbd