#!/usr/bin/bash
#
# Start a netboot VM connected to macvtap device and fraction of mem/cpus
#
set -eu

menu=(standard "CLI Standard Debian GNU/Linux"
      kde-desktop "KDE Plasma Desktop Debian GNU/Linux"
      gnome-desktop "Gnome Desktop Debian GNU/Linux")
img=$(dialog --clear --backtitle "Virtual Machine Chooser" \
             --title "Choose the Virtual Machine to Start" \
             --menu "Start VM:" 12 60 6 \
             "${menu[@]}" 2>&1 >/dev/tty)

if [[ -z $img ]] ; then
    echo "Starting VM canceled."
    exit 1
fi

mac="$(ip link | grep -A1 "vm-macvtap" | \
          sed -nE "s%\s+link/ether ([[:xdigit:]:]{17}) .+%\1%p")"

if [[ $# -eq 0 ]] ; then
    mem=$(sed -En "s/^MemTotal:\s+([0-9]+)\s+kB/\1/p" /proc/meminfo)
    cpu=$(sed -En "0,/^cpu cores/s/^cpu cores\s+:\s+([0-9]+)/\1/p" /proc/cpuinfo)
    arg=("--memory=$((mem/2048))" "--vcpu=$((cpu/2))")
    echo Set options: "${arg[@]}"
else
    arg=("$@")
fi

kernel="http://livebox/d-i/n-live/$img/live/vmlinuz"
initrd="http://livebox/d-i/n-live/$img/live/initrd.img"
kargs=(boot=live components splash locales=de_DE.UTF-8 keyboard-layouts=de \
                 swap=true live-config.timezone=Europe/Berlin netboot=nfs \
                 "nfsroot=10.190.1.2:/srv/nfs/debian-live/$img/")

type="ethernet,mac=${mac},target.dev=vm-macvtap,xpath1.set=./target/@managed=no"

## FIXME: use passt, needs more settings for correct DNS/gateway
# type=user,xpath1.create=./backend,xpath2.set=./backend/@type=passt,xpath3.create=./ip,xpath4.set=./ip/@family=ipv4,xpath5.set=./ip/@address=172.16.1.1,xpath6.set=./ip/@prefix=24,xpath7.create=./portForward,xpath8.set=./portForward/@proto=tcp,xpath9.set=./portForward/range/@start=2001,xpath10.set=./portForward/range/@end=2500,xpath11.set=./portForward/range/@to=1

case "$img" in
    standard)
	arg+=("--autoconsole=text")
	kargs+=("console=ttyS0")
	;;
    *)
	;;
esac

http_proxy='' XDG_CONFIG_HOME="/tmp/${UID}/.config" \
          exec virt-install \
          --name "$img" \
          --osinfo debiantesting \
          --nodisks --import --noreboot --transient \
          --install kernel="$kernel",initrd="$initrd",kernel_args="${kargs[*]}" \
          --network "type=$type" "${arg[@]}"

# --filesystem "$HOME",share
# mount -t 9p share /mnt