#!/bin/bash
# desktop-assistant tool: virtual machine status through virsh (read-only).
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# vms.sh [NAME]: without NAME, every defined VM with its state; with NAME,
# that VM's state, vCPUs, memory, autostart and IP address when one is
# known. Only list, domstate, dominfo and domifaddr run here: nothing is
# started, stopped or edited. Uses libvirt's default URI (LIBVIRT_DEFAULT_URI
# overrides it).

set -uo pipefail

name="${1:-}"
if [ -z "$name" ]; then
    vms=$(virsh list --all --name) || exit 1
    [ -n "${vms//[[:space:]]/}" ] || { echo "no virtual machines defined"; exit 0; }
    while read -r vm; do
        [ -n "$vm" ] && echo "$vm: $(virsh domstate "$vm")"
    done <<<"$vms"
    exit 0
fi

# An unknown name leaves virsh's own error as the last stderr line.
info=$(virsh dominfo "$name") || exit 1
field() { sed -n "s/^$1: *//p" <<<"$info"; }
echo "$name: $(field State), $(field 'CPU(s)') vCPUs," \
     "$(( $(field 'Max memory' | awk '{print $1}') / 1048576 )) GiB memory," \
     "autostart $(field Autostart)"

# The DHCP lease is empty for bridged guests; ARP or the guest agent knows.
for source in lease arp agent; do
    ip=$(virsh domifaddr "$name" --source "$source" 2>/dev/null \
         | awk 'NR > 2 && $4 != "" && $4 !~ /^127\./ {sub(/\/.*/, "", $4); print $4}' | paste -sd, -)
    [ -n "$ip" ] && { echo "IP address: $ip"; break; }
done