#!/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 NFS"
      standard-ram "CLI Standard Debian GNU/Linux RAM"
      kde-desktop "KDE Plasma Desktop Debian GNU/Linux NFS"
      gnome-desktop "Gnome Desktop Debian GNU/Linux NFS")
img=$(dialog --clear --backtitle "Virtual Machine Chooser" \
             --title "Choose the Virtual Machine to Start" \
             --menu "Start VM:" 12 70 6 "${menu[@]}" 2>&1 >/dev/tty)

## If the menu is canceled, $0 stops here because of set -e

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/${img%-ram}/live/vmlinuz"
initrd="http://livebox/d-i/n-live/${img%-ram}/live/initrd.img"
kargs=(boot=live components splash locales=de_DE.UTF-8 keyboard-layouts=de
       swap=true live-config.timezone=Europe/Berlin)

case "$img" in
    standard*)
        arg+=(--autoconsole=text)
        kargs+=(console=ttyS0)
        ;;&
    *-ram)
        kargs+=("fetch=http://10.190.1.2/d-i/n-live/${img%-ram}/live/filesystem.squashfs")
        ;;
    *)
        kargs+=(netboot=nfs "nfsroot=10.190.1.2:/srv/nfs/debian-live/${img%-ram}")
        ;;
esac

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

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

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