#!/bin/sh
## SPDX-FileCopyrightText: 2024 Benjamin Grande M. S. <ben.grande.b@gmail.com>
##
## SPDX-License-Identifier: AGPL-3.0-or-later

set -eu

usage(){
  printf '%s\n' "Usage: ${0##*/} QUBE" >&2
  exit "${1:-1}"
}

get_qube_feat(){
  qube="${1}"
  qvm-features "${qube}" | \
    grep -E -e "^(os-(distribution|version)|template-(release|name))" | \
    sed -e "s/  / /g;s/ /: /;s/^/  /"
}

case "${1-}" in
  -h|--?help) usage 0;;
  -*|"") usage 1;;
  *) wanted_qube="${1}";;
esac

mgmt="$(qubes-prefs management_dispvm)"
printf '%s\n' "GLOBAL"
printf '%s\n' "management_dispvm: ${mgmt}"
tpl_mgmt="$(qvm-prefs "${mgmt}" template)"
printf '%s\n' "management_dispvm template: ${tpl_mgmt}"
printf '%s\n' "management_dispvm template features:"
get_qube_feat "${tpl_mgmt}"

if ! qvm-check -q -- "${wanted_qube}"; then
  printf '%s\n' "error: qube '${wanted_qube}' does not exist" >&2
  exit 1
fi
printf '%s\n' ""
printf '%s\n' "WANTED"
printf '%s\n' "qube: ${wanted_qube}"
class="$(qvm-prefs "${wanted_qube}" klass)"
printf '%s\n' "class: ${class}"
case "${class}" in
  AppVM)
    tpl_wanted_qube="$(qvm-prefs "${wanted_qube}" template)"
    printf '%s\n' "template: ${tpl_wanted_qube}"
    printf '%s\n' "template features:"
    get_qube_feat "${tpl_wanted_qube}"
    ;;
  DispVM)
    dvm_wanted_qube="$(qvm-prefs "${wanted_qube}" template)"
    printf '%s\n' "disposable template: ${dvm_wanted_qube}"
    tpl_wanted_qube="$(qvm-prefs "${dvm_wanted_qube}" template)"
    printf '%s\n' "template: ${tpl_wanted_qube}"
    printf '%s\n' "template features:"
    get_qube_feat "${tpl_wanted_qube}"
    ;;
  AdminVM) ;;
  StandaloneVM|TemplateVM)
    get_qube_feat "${wanted_qube}"
    ;;
  *) printf '%s\n' "Unsupported qube class" >&2; exit 1;;
esac
wanted_mgmt="$(qvm-prefs "${wanted_qube}" management_dispvm)"
printf '%s\n' "${wanted_qube} management_dispvm: ${wanted_mgmt}"
if test "${wanted_mgmt}" = "${mgmt}"; then
  exit
fi
wanted_tpl_mgmt="$(qvm-prefs "${wanted_mgmt}" template)"
printf '%s\n' "${wanted_qube} management_dispvm template: ${wanted_tpl_mgmt}"
printf '%s\n' "${wanted_qube} management_dispvm template features:"
get_qube_feat "${wanted_tpl_mgmt}"