#!/bin/sh

basedir="`dirname "$0"`/.."

TAPUTIL="$basedir/bin/taputil"
SUDO="/usr/bin/sudo"

#VM_NAME="xp.intra.ogris.net"
if [ -z "$VM_NAME" ]; then
  script="`basename "$0"`"
  script=${script%%.sh}
  VM_NAME=${script##[0-9]}
  port=${script%%$VM_NAME}
fi

VM_VNC=${VM_VNC:-$port}
VM_MEM=${VM_MEM:-2048}
VM_CPU=${VM_CPU:-"host"}
VM_MACHINE=${VM_MACHINE:-"pc"}
VM_CPUS=${VM_CPUS:-2}
VM_CDROMS=${VM_CDROMS:-1}
VM_EXTRA=${VM_EXTRA:-""}
VM_LAUNCH_VNC=${VM_LAUNCH_VNC:-1}

VM_FILE_NAME0=${VM_FILE_NAME0:-$VM_NAME}
#VM_FILE_TYPE0="virtio"
#VM_FILE_CACHE0="none"
#...
#VM_FILE_NAME9=...
#VM_FILE_TYPE9=...
#VM_FILE_CACHE9=...

#VM_NET_MAC0=${VM_NET_MAC0:-"52:54:00:00:0$VM_MAC:00"}
#VM_NET_TAP0=${VM_NET_TAP0:-"0$VM_VNC"}
VM_NET_TYPE0=${VM_NET_TYPE0:-"virtio"}
#VM_NET_BRIDGE0={$VM_NET_BRIDGE0:-"00"}
#...
#VM_NET_MAC3=${VM_NET_MAC0:-"52:54:00:00:0$VM_MAC:03"}
#VM_NET_TAP3=...
#VM_NET_TYPE3=...
#VM_NET_BRIDGE3=...

VM_PORT=${VM_PORT:-$((VM_VNC+6666))}
VM_MAC=${VM_MAC:-$VM_VNC}
VM_PID=${VM_PID:-"$basedir/tmp/kvm-$VM_NAME.pid"}

# for remote shutdown via net rpc:
#VM_SHUT_DOMAIN="XP"
#VM_SHUT_USER="administrator"
#VM_SHUT_PASS="secret"
#VM_SHUT_HOST="192.168.1.13"

[ -z "$VM_NAME" ] && { echo "no VM_NAME" >&2; exit 1; }
[ -z "$VM_VNC" ] && { echo "no VM_VNC" >&2; exit 1; }
[ -x "$TAPUTIL" ] || { echo "no $TAPUTIL" >&2; exit 1; }
[ -x "$SUDO" ] || { echo "no $SUDO" >&2; exit 1; }

function vm_vnc() {
  local xpos=$((VM_VNC%2*850))
  local ypos=$((VM_VNC/2*650))
  nohup vncviewer :"$VM_VNC" -geometry "+$xpos+$ypos" >/dev/null 2>&1 &
}

function vm_nics() {
  local mode="$1"
  local nicmac
  local nictap
  local nictype
  local nicbridge
  local bridge
  local port
  local i

  nics=""
  for i in {0..3}; do
    eval nicmac=\$VM_NET_MAC$i
    eval nictap=\$VM_NET_TAP$i
    eval nictype=\$VM_NET_TYPE$i
    eval nicbridge=\$VM_NET_BRIDGE$i

    [ -z "$nicmac" -a -z "$nictap" -a -z "$nictype" -a -z "$nicbridge" ] && continue

    nicmac=${nicmac:-"52:54:00:00:0$VM_MAC:0$((i+1))"}
    bridge=`printf %02d $i`
    port=`printf %02d $VM_VNC`
    nictap=${nictap:-"${bridge}${port}"}
    nictype=${nictype:-"virtio"}
    nicbridge=${nicbridge:-"${bridge}"}

    if [ "$nictype" != "none" ]; then
      nics="$nics -net nic,vlan=$i,model=$nictype,macaddr=$nicmac \
      -net tap,vlan=$i,ifname=tap$nictap,script=no,downscript=no"

      "$SUDO" "$TAPUTIL" "$mode" "$nictap" "$nicbridge" || exit 1
    fi
  done
}

function vm_start() {
  local files
  local filename
  local filetype
  local filecache
  local i
  local have_cdrom
  local cdroms

  echo "Starting $VM_NAME"

  vm_nics "add"

  files=""
  for i in {0..9}; do
    eval filename=\$VM_FILE_NAME$i
    eval filetype=\$VM_FILE_TYPE$i
    eval filecache=\$VM_FILE_CACHE$i
    filetype=${filetype:-"virtio"}
    filecache=${filecache:-"none"}
    [ -n "$filename" -a "$filename" != "none" ] && files="$files \
      -drive format=raw,cache=$filecache,file=$basedir/disks/$filename.raw,if=$filetype"
  done

  have_cdrom=-1
  for i in "$@"; do
    [ "$i" = "-cdrom" ] && have_cdrom=0
  done
  cdroms=""
  for i in {0..3}; do
    [ $i -lt $VM_CDROMS -a $have_cdrom -ne $i ] && cdroms="$cdroms \
      -drive readonly=on,media=cdrom,if=ide,bus=1,unit=$i"
  done

  qemu-system-x86_64 --enable-kvm -k de -rtc base=utc -daemonize -m "$VM_MEM" \
    -name "$VM_NAME" -cpu "$VM_CPU" -machine "$VM_MACHINE" -smp "$VM_CPUS" \
    $files \
    $nics \
    $cdroms \
    -soundhw ac97 \
    -balloon virtio \
    -vnc :"$VM_VNC" -monitor tcp::"$VM_PORT",server,nowait \
    -pidfile "$VM_PID" \
    $VM_EXTRA \
    "$@"

  sleep 1

  if [ "$VM_LAUNCH_VNC" = "1" ]; then
    vm_vnc
  fi

  echo >/dev/tcp/localhost/$VM_PORT
}

function vm_quit() {
  local i
  local p

  echo quit | nc localhost $VM_PORT &

  echo -n "waiting 30 seconds for $VM_NAME to quit"
  for i in {0..30}; do
    sleep 1
    echo -n "."
    p=`cat "$VM_PID" 2>/dev/null` || { echo "ok"; return; }
    kill -0 "$p" 2>/dev/null || { echo "ok"; rm -f "$VM_PID"; return; }
  done

  echo "did neither shutdown nor quit, killing"
  p=`cat "$VM_PID"` || return
  rm -f "$VM_PID"
  kill "$p"
}

function vm_stop() {
  local i
  local p

  echo "Stopping $VM_NAME"

  [ -n "$VM_SHUT_HOST" ] && net rpc shutdown -f \
    -U "$VM_SHUT_DOMAIN"'\'"$VM_SHUT_USER"'%'"$VM_SHUT_PASS" -t 2 \
    -I "$VM_SHUT_HOST"

  echo system_powerdown | nc localhost $VM_PORT &

  echo -n "waiting 150 seconds for $VM_NAME to shutdown"
  for i in {0..180}; do
    sleep 1
    echo -n "."
    p=`cat "$VM_PID" 2>/dev/null` || { echo "ok"; return; }
    kill -0 "$p" 2>/dev/null || { echo "ok"; rm -f "$VM_PID"; return; }
  done

  vm_quit
}

function vm_cmd() {
  exec telnet localhost $VM_PORT
}

case "$1" in
  start)
    shift
    vm_start "$@"
    ;;
  stop)
    vm_stop
    vm_nics "del"
    ;;
  quit)
    vm_quit
    vm_nics "del"
    ;;
  vnc)
    vm_vnc
    ;;
  cmd)
    vm_cmd
    ;;
  *)
    echo "usage: $0 <start | stop> [ option ... ]" >&2
    exit 1
    ;;
esac