- name: prepare nested environment
  hosts: "{{target}}"
  gather_facts: no
  become: "{{ become_var | default(false) }}"
  # we need /dev/nbd0 to be used by one guest only, therefore reducing batch size to a single host
  # https://docs.ansible.com/projects/ansible/latest/playbook_guide/playbooks_strategies.html#setting-the-number-of-forks
  serial: 1
  tasks:

  - debug: var=type

  # assuming user has perms to write in /data/guests/
  - name: kvm guest configs
    delegate_to: "{{kvm_host}}"
    run_once: false # every single guest needs to be configured
    template:
      src: "{{type}}.{{inventory_hostname_short}}.xml"
      dest: "/data/guests/{{inventory_hostname_short}}/{{inventory_hostname_short}}.xml"

  - name: un-mounting guests just in case
    delegate_to: "{{kvm_host}}"
    run_once: false # every single guest needs to be configured
    shell:
      executable: /bin/bash
      cmd: |
        set -e

        tmp=`virsh list --all | grep -E "[[:space:]]+{{inventory_hostname_short}}[[:space:]]+"` || true
        [[ -n $tmp ]] && echo guest already running && exit 0
        unset tmp

        [[ {{ansible_check_mode}} = True ]] && echo will do during play && exit 0

        if [[ {{vdisk_type}} = qcow2 ]]; then
          img=/data/guests/{{inventory_hostname_short}}/{{inventory_hostname_short}}.qcow2
        elif [[ {{vdisk_type}} = zfs ]]; then
          img=/dev/zvol/smith/{{inventory_hostname_short}}_boot
        else
          echo error: unknown vdisk_type
          exit 1
        fi

        mnt=/data/guests/{{inventory_hostname_short}}/lala

        #echo checking whether /dev/nbd0p1 already exists
        #ls -lF /dev/nbd0p1 && exit 1 || true

        # deal with previously mounted for possibly other guests
        echo checking for mounted guests just in case
        mounted_guests=`mount | grep /lala | awk '{print $3}'`

        for mounted_guest in $mounted_guests; do
          echo -n UN-MOUNTING $mounted_guest/ ...
          umount $mounted_guest/ && echo DONE
        done; unset mounted_guest

        unset mounted_guests

        echo disconnecting nbd0 just in case
        qemu-nbd -d /dev/nbd0 || true
    check_mode: false
    register: output

  - debug: var=output.stdout
  - debug: var=output.stderr

  - name: mounting guests
    delegate_to: "{{kvm_host}}"
    run_once: false # every single guest needs to be configured
    shell:
      executable: /bin/bash
      cmd: |
        set -e

        tmp=`virsh list --all | grep -E "[[:space:]]+{{inventory_hostname_short}}[[:space:]]+"` || true
        [[ -n $tmp ]] && echo guest already running && exit 0
        unset tmp

        [[ {{ansible_check_mode}} = True ]] && echo will do during play && exit 0

        if [[ {{vdisk_type}} = qcow2 ]]; then
          img=/data/guests/{{inventory_hostname_short}}/{{inventory_hostname_short}}.qcow2
        elif [[ {{vdisk_type}} = zfs ]]; then
          img=/dev/zvol/smith/{{inventory_hostname_short}}_boot
        else
          echo error: unknown vdisk_type
          exit 1
        fi

        mnt=/data/guests/{{inventory_hostname_short}}/lala

        echo -n preparing /dev/nbd0 ...
        modprobe nbd
        qemu-nbd --connect=/dev/nbd0 --format={{vdisk_format}} $img && echo done
        sleep 1

        echo -n /dev/nbd0p1 now should exist ...
        ls -lF /dev/nbd0p1 >/dev/null && echo done

        echo -n mounting nbd0p1 ...
        mkdir -p $mnt/
        mount /dev/nbd0p1 $mnt/ && echo done
    check_mode: false
    register: output

  - debug: var=output.stdout
  - debug: var=output.stderr

  - name: guest interfaces on debian systems
    delegate_to: "{{kvm_host}}"
    run_once: false # every single guest needs to be configured
    template:
      src: "{{type}}.interfaces.{{inventory_hostname_short}}"
      dest: "/data/guests/{{inventory_hostname_short}}/lala/etc/network/interfaces"
    when:
      - system == 'debian'
      - not ansible_check_mode
      - "'already running' not in output.stdout"

  - name: inet1 on slackware systems
    delegate_to: "{{kvm_host}}"
    run_once: false # every single guest needs to be configured
    template:
      src: "{{type}}.inet1.{{inventory_hostname_short}}"
      dest: "/data/guests/{{inventory_hostname_short}}/lala/etc/rc.d/rc.inet1"
    when:
      - system == 'slackware'
      - not ansible_check_mode
      - "'already running' not in output.stdout"

  # assuming user has perms to run virsh
  - name: un-mount and guests are up
    delegate_to: "{{kvm_host}}"
    run_once: false # every single guest needs to be configured
    shell:
      executable: /bin/bash
      cmd: |
        set -e

        tmp=`virsh list --all | grep -E "[[:space:]]+{{inventory_hostname_short}}[[:space:]]+"` || true
        [[ -n $tmp ]] && echo guest already running && exit 0
        unset tmp

        [[ {{ansible_check_mode}} = True ]] && echo will do during play && exit 0

        img=/data/guests/{{inventory_hostname_short}}/{{inventory_hostname_short}}.qcow2
        mnt=/data/guests/{{inventory_hostname_short}}/lala

        echo -n un-mounting $mnt/ ...
        umount $mnt/ && echo done

        # self-verbose
        echo disconnecting nbd0
        qemu-nbd -d /dev/nbd0
    check_mode: false
    register: output

  - debug: var=output.stdout
  - debug: var=output.stderr

  - name: start guests at boot time
    delegate_to: "{{kvm_host}}"
    run_once: true
    template:
      src: rc.local.slackware
      dest: /etc/rc.d/rc.local
      mode: 0755
    when:
      - start_guests is defined
      - system == 'slackware'

  - debug:
      msg: |
        ready do proceed:

          virsh create /data/guests/{{inventory_hostname_short}}/{{inventory_hostname_short}}.xml --console