#!/bin/sh

set -e

# defaults
RAM=512
DISK=20
STORAGE_POOL=default
QEMU_URI=qemu:///system
SUITE=wheezy
CONSOLE='console=tty0 console=ttyS0,115200n8'

while [ -n "$1" ]; do
  case "$1" in
    (-n|--name)
      shift
      if [ -z "$1" ]; then
        echo >&2 'E: --name/-n needs hostname argument'
        exit 1
      fi
      HOSTNAME="$1"
      ;;
    (-i|--ipaddress)
      shift
      if [ -z "$1" ]; then
        echo >&2 'E: --ipaddress/-i needs IP address/netmask'
        exit 1
      fi
      case "$1" in
        (*/*) :;;
        (*)
          echo >&2 'E: missing netmask'
          exit 1
          ;;
      esac
      IPADDRESS="$1"
      ;;
    (-d|--dns)
      shift
      if [ -z "$1" ]; then
        echo >&2 'E: --dns/-d needs IP address'
        exit 1
      fi
      NAMESERVER="$1"
      ;;
    (-g|--gateway)
      shift
      if [ -z "$1" ]; then
        echo >&2 'E: --gateway/-g needs IP address'
        exit 1
      fi
      GATEWAY="$1"
      ;;
    (-r|--ram)
      shift
      if [ -z "$1" ]; then
        echo >&2 'E: --ram/-r needs number (megabytes)'
        exit 1
      fi
      RAM="$1"
      ;;
    (-s|--size)
      shift
      if [ -z "$1" ]; then
        echo >&2 'E: --size/-s needs size argument'
        exit 1
      fi
      DISK="$1"
      ;;
  esac
  shift
done

if [ -z "${HOSTNAME:-}" ]; then
  echo >&2 'E: hostname is required'
  exit 2
fi

BASEDIR=$(cd ${0%/*}; pwd)

tmpdir=$(mktemp -d)
tar -C $BASEDIR/preseed/$SUITE -cf $tmpdir/commands.tar commands

extra_args="auto $CONSOLE \
hostname=${HOSTNAME%%.*} \
domain=${HOSTNAME#*.}"

if [ -n "$IPADDRESS" ]; then
  if [ -z "$GATEWAY" ] && [ -x $(command -v ipcalc) ]; then
    # default to the first IP in the network
    GATEWAY=$(ipcalc $IPADDRESS | grep HostMin | awk '{print $2}')
  fi
  NETMASK="${IPADDRESS#*/}"
  IPADDRESS="${IPADDRESS%/*}"
  : ${NAMESERVER:=$GATEWAY}

  extra_args="$extra_args netcfg/disable_dhcp=true \
  netcfg/get_ipaddress=$IPADDRESS \
  netcfg/get_netmask=$NETMASK \
  netcfg/get_gateway=$GATEWAY \
  netcfg/get_nameservers=$NAMESERVER"

else
  extra_args="$extra_args netcfg/disable_dhcp=false"
fi

cat >&2 <<_eof
  hostname: $HOSTNAME
       ram: $RAM MiB
      disk: $DISK GiB
   console: $CONSOLE
_eof
if [ -n "$IPADDRESS" ]; then
  cat >&2 <<_eof
 ipaddress: $IPADDRESS
   netmask: $NETMASK
   gateway: $GATEWAY
nameserver: $NAMESERVER
_eof
else
  cat >&2 <<_eof
      dhcp: true
_eof
fi

exit 0

exec virt-install --connect=$QEMU_URI \
  -n $HOSTNAME \
  -r $RAM \
  --disk pool=default,size=$SIZE \
  -w bridge=virt-br \
  --graphics=vnc \
  --serial=pty \
  --watchdog i6300esb,action=reset \
  --os-variant=debian$SUITE \
  -l $BASEDIR/installer-amd64 \
  --initrd-inject=$BASEDIR/preseed/$SUITE/preseed.cfg \
  --initrd-inject=$tmpdir/commands.tar \
  --extra-args="$extra_args" \
  --autostart \
  "$@"