#!/bin/bash
# 
# following prerequisites are needed
# - all keys must be present to current user (use add_keys script to import)

flavor='testing'
secgroup='Bitmask'
keys='--key_name varac --key_name drebs --key_name kwadronaut --key_name micah --key_name elijah'


usage()
{
cat << EOF
usage: $0 options

This script reverts an openstack instance to it's snapshot.

OPTIONS:
 -h             Show this message
 -i <instance>   
 -s <snapshot>
 -v             verbose mode
EOF
}

set -- $(getopt hi:s:v "$@")
while [ $# -gt 0 ]
do
    case "$1" in
    (-h) usage; exit 1 ;;
    (-i) instance="$2"; shift;;
    (-s) snapshot="$2"; shift;;
    (--) shift; break;;
    (-*) echo "$0: error - unrecognized option $1" 1>&2; exit 1;;
    (*)  break;;
    esac
    shift
done

if [[ -z $instance ]] || [[ -z $snapshot ]] 
then
     usage
     exit 1
fi

echo "Querying $instance..."


ips=`nova show --minimal $instance | grep 'private network'| cut -f 3 -d'|'`
# 192.168.10.2, 192.168.11.7, 192.168.11.9

float_ips=`echo "$ips"| cut -f 2- -d',' | sed 's/,/ /g'`
# 192.168.11.7 192.168.11.9

echo "Floating IPs: $float_ips"

for ip in $float_ips
do
  echo "Removing floating ip $ip from $instance"
  nova floating-ip-delete $ip

  # will re-allocate the removed ip in the pool
  echo "Re-allocating $ip to the floating-ip pool"
  nova floating-ip-create > /dev/null
done

echo
echo "Deleting $instance"
nova delete $instance

echo
echo "Booting $instance from snapshot $snap"
result=`nova boot --image $snapshot --flavor $flavor --security-groups $secgroup $keys $instance`

# unfortunatly unformatted
#echo $result

newid=`echo "$result" | grep '| id ' | cut -d '|' -f 3 | sed 's/ //g' `

echo
echo "New ID for instance $instance: $newid"

for ip in $float_ips
do
  echo "Adding floating ip $ip to $newid"
  nova add-floating-ip $newid $ip
done

nova list

echo
echo "Hang on and wait for the new instance (ID $newid) to finish building before you try to login !"