#!/bin/ksh -p

if [ ! -w /etc/passwd ]
then
  echo Not root
  exit
fi

IMAGES=/var/lib/libvirt/images
XML=/etc/libvirt/qemu

file=0
graphics="--nographics"
console="console=ttyS0,9600"
console="console=ttyS0,9600 cmdline"
text="text"
os=6
ks=""
repo=""
hardware=""
ram=1536  # During install phase
STANDARD_RAM=512
dsize=4  # Disk size in GB
lvm=Raid10

while getopts fg67d:l: OPT
do
  case $OPT in
    f) file=1 ;;
    6) ks=6 ; repo=http://repo/CentOS/DVD/CentOS-6 ;;
    7) ks=7 ; repo=http://repo/CentOS/DVD/CentOS-7 ;;
    g) graphics="" ; text="" ; console="" ;;
    d) dsize=$OPTARG ;;
    l) lvm=$OPTARG ;;
  esac
done

if [ -z "$repo" ]
then
  echo Need at least -6 or -7
  exit
fi

shift $(($OPTIND - 1))

machine=$1
mac=$2  # optional

if [ -z "$machine" ]
then
  echo "Syntax: ${0##*/} -6|-7 [-f] [-g] [-d#] [-l LVM] machine_name [MAC]"
  echo "  f==> files, not LVM."
  echo "  d==> disk size in Gb; default=4"
  echo "  l==> LVM volume group; default=Raid10"
  exit
fi

if [ $file = 1 ]
then
  destfile=$IMAGES/$machine.img
else
  destfile=/dev/$lvm/vm.$machine
fi

if [ -r $XML/$machine.xml ]
then
  echo $XML/$machine.xml already exists
  echo aborted
  exit
fi

if [ -e $destfile ]
then
  echo $destfile already exists
  echo aborted
  exit
fi

if [ -z "$mac" ]
then
  mac=$(tr -d ' ' < $HOME/etc/localnet/DNS/machines | awk -F';' '$3 == "'$machine'" { print $2}' )
  mac=${mac#!}
  echo Using mac $mac
fi

if [ -n "$mac" ]
then
  case $mac in
    [0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]:[0-9A-Fa-f][0-9A-Fa-f]) # Looks good!
                      mac=",mac=$mac"
                      ;;
                   *) echo Bad format MAC address
                      exit
  esac
fi

echo Building VM

if [ $file = 0 ]
then
  lvcreate -L ${dsize}G -n vm.$machine $lvm || exit
else
  destfile=$destfile,size=${dsize}
fi

set -x

virt-install \
-n $machine \
-r $ram \
--vcpus=1 \
--os-variant=rhel$os \
--accelerate \
-v \
--network=bridge=br0$mac,target=v-$machine \
--disk path=$destfile \
-l $repo \
$graphics $hardware \
-x "ks=http://10.0.0.137/CentOS/kickstart/centos$ks.cfg ksdevice=eth0 ip=dhcp $console"

# Reset VM to target RAM size
virsh setmem $machine ${STANDARD_RAM}M --config
virsh setmem $machine ${STANDARD_RAM}M
virsh setmaxmem $machine ${STANDARD_RAM}M --config
virsh setmaxmem $machine ${STANDARD_RAM}M