#!/bin/bash
#
# launcher script for qemu-kvm
#
# machines are sourced from a file which defines functions, each
# specifying options for the particular VM, for example:
#
# vm_beatbox() {
#   net+=",mac=de:ad:be:ef:00:01"
#   cdrom="-cdrom $isoroot/archlinux-2011.05.08-core-x86_64.iso -boot d"
#
#   opts=(-nographic)
#   drives=(
#     "-drive file=$imgroot/beatbox.1.qcow2,if=virtio"
#     "-drive file=$imgroot/beatbox.2.qcow2,if=virtio"
#   )
# }
#
# If unspecified:
#   ${drives[@]}: will match all of "$imgroot/$vm".*.{qcow2,raw}
#

shopt -s nullglob

### Paths ################################
#declare config_root=/mnt/levant/nfs/tmp/Florian/qemu
declare config_root=/mnt/data/qemu
declare -r machines=~/.config/qinit-machines
declare isoroot=$config_root
declare imgroot=$config_root

### Defaults #############################
declare mem="-m 1024"
declare cpus="-cpu host -smp 4"
declare net="-netdev bridge,br=virbr1,id=mynet0 -device virtio-net,netdev=mynet0"
cdrom+=("-boot" "d")

#declare cdrom="-cdrom $isoroot/archlinux-2012.11.01-dual.iso -boot d"
for iso in "$isoroot/"*.iso; do
	cdrom+=("-cdrom" "$iso")
done
### Launcher #############################

. "$machines"

while getopts 'c' flag; do
  case $flag in
    c) usecdrom=true ;;
  esac
done
shift $(( OPTIND - 1 ))

if [[ -z $1 ]]; then
  printf 'Available VMs:\n'
  compgen -A function -- vm_ | sed 's/^vm_/   /'
  exit 0
fi

vm=$1; shift
if ! type -t vm_$vm >/dev/null; then
  printf 'unknown VM: %s\n' "$vm"
  exit 1
fi

vm_$vm

# default drives
if (( ${#drives[*]} == 0 )); then
  for drive in "$imgroot/$vm".*.raw; do
    drives+=("-drive" "file=$drive,if=virtio,format=virtio-scsi")
  done

  for drive in "$imgroot/$vm".*.qcow2; do
    drives+=("-drive" "file=$drive,if=virtio")
  done
fi

exec qemu-system-x86_64 -monitor stdio --machine type=pc,accel=kvm -boot order=dcn "${opts[@]}" $cpus $mem "${drives[@]}" $net ${usecdrom:+${cdrom[@]}} "$@"