#!/usr/bin/env bash
# Manage VM nodes which have a specific set of hardware attributes.

VM_MEMORY=${VM_MEMORY:-3048}
VM_DISK=${VM_DISK:-10}

if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi

function main {
  case "$1" in
    "create") create_docker;;
    "start") start;;
    "reboot") reboot;;
    "shutdown") shutdown;;
    "poweroff") poweroff;;
    "destroy") destroy;;
    *)
      usage
      exit 2
      ;;
  esac
}

function usage {
  echo "USAGE: ${0##*/} <command>"
  echo "Commands:"
  echo -e "\tcreate\t\tcreate QEMU/KVM nodes on the docker0 bridge"
  echo -e "\tstart\t\tstart the QEMU/KVM nodes"
  echo -e "\treboot\t\treboot the QEMU/KVM nodes"
  echo -e "\tshutdown\tshutdown the QEMU/KVM nodes"
  echo -e "\tpoweroff\tpoweroff the QEMU/KVM nodes"
  echo -e "\tdestroy\t\tdestroy the QEMU/KVM nodes"
}

COMMON_VIRT_OPTS="--memory=${VM_MEMORY} --vcpus=1 --disk pool=default,size=${VM_DISK} --os-variant=fedora-coreos-stable --noautoconsole"

NODE1_NAME=node1
NODE1_MAC=52:54:00:a1:9c:ae

NODE2_NAME=node2
NODE2_MAC=52:54:00:b2:2f:86

NODE3_NAME=node3
NODE3_MAC=52:54:00:c3:61:77

function create_docker {
  virt-install --name $NODE1_NAME --network=bridge:docker0,mac=$NODE1_MAC $COMMON_VIRT_OPTS --boot=hd,network
  virt-install --name $NODE2_NAME --network=bridge:docker0,mac=$NODE2_MAC $COMMON_VIRT_OPTS --boot=hd,network
  # virt-install --name $NODE3_NAME --network=bridge:docker0,mac=$NODE3_MAC $COMMON_VIRT_OPTS --boot=hd,network
}

nodes=(node1 node2)

function start {
  for node in ${nodes[@]}; do
    virsh start $node
  done
}

function reboot {
  for node in ${nodes[@]}; do
    virsh reboot $node
  done
}

function shutdown {
  for node in ${nodes[@]}; do
    virsh shutdown $node
  done
}

function poweroff {
  for node in ${nodes[@]}; do
    virsh destroy $node
  done
}

function destroy {
  for node in ${nodes[@]}; do
    virsh destroy $node
  done
  for node in ${nodes[@]}; do
    virsh undefine $node
  done
  virsh pool-refresh default
  for node in ${nodes[@]}; do
    virsh vol-delete --pool default $node.qcow2
  done
}

main $@