host_vm_dir=$WORK_DIR/vm
function tear_down_machines() {
    old_ifs=$IFS
    IFS=,
    for i in $HOSTNAMES; do
        sudo virsh destroy $i
        sudo virsh undefine $i
        rm -rf $host_vm_dir/$i
    done
    IFS=$old_ifs
}

function reboot_hosts() {
    log_warn "reboot_hosts do nothing"
}

function launch_host_vms() {
    old_ifs=$IFS
    IFS=,
    #function_bod
    mac_array=($machines)
    log_info "bringing up pxe boot vms"
    i=0
    for host in $HOSTNAMES; do
        log_info "creating vm disk for instance $host"
        vm_dir=$host_vm_dir/$host
        mkdir -p $vm_dir
        sudo qemu-img create -f raw $vm_dir/disk.img ${VIRT_DISK}
        # create vm xml
        sed -e "s/REPLACE_MEM/$VIRT_MEM/g" \
          -e "s/REPLACE_CPU/$VIRT_CPUS/g" \
          -e "s/REPLACE_NAME/$host/g" \
          -e "s#REPLACE_IMAGE#$vm_dir/disk.img#g" \
          -e "s/REPLACE_BOOT_MAC/${mac_array[i]}/g" \
          -e "s/REPLACE_NET_INSTALL/install/g" \
          -e "s/REPLACE_NET_IAAS/external/g" \
          -e "s/REPLACE_NET_TENANT/external/g" \
          $COMPASS_DIR/deploy/template/vm/host.xml\
          > $vm_dir/libvirt.xml

        sudo virsh define $vm_dir/libvirt.xml
        sudo virsh start $host
        let i=i+1
    done
    IFS=$old_ifs
}

function get_host_macs() {
    local mac_generator=${COMPASS_DIR}/deploy/mac_generator.sh
    local machines=

    if [[ $REDEPLOY_HOST == "true" ]]; then
        mac_array=`cat $WORK_DIR/switch_machines`
    else
        chmod +x $mac_generator
        mac_array=`$mac_generator $VIRT_NUMBER`
        echo $mac_array > $WORK_DIR/switch_machines
    fi

    machines=`echo $mac_array|sed 's/ /,/g'`

    echo $machines
}