Easy VirtualBox VM handling for the command line

gistfile1.sh

#!/bin/bash -e
#
# Easy VirtualBox VM handling from the command line

BASE_TEMPLATE="<uid-of-template-vm>"

function show_help() {
    echo "Usage: $0 [cmd]"
    echo "Valid commands:"
    echo "  list         List available virtual machines"
    echo "  status       List running virtual machines"
    echo "  start <vm>   Start virtual machine <vm>"
    echo "  stop <vm>    Stop (save state) of virtual machine <vm>"
    echo "  create <vm>  Create a new machine based on base template"
    echo "  destroy <vm> Destroy virtual machine <vm>"
    echo ""
    echo "Base template: " $BASE_TEMPLATE
}

function list_vms() {
    echo "Available virtual machines:"
    vboxmanage list vms
}

function list_running() {
    echo "Running virtual machines:"
    vboxmanage list runningvms
}

function check_exists() {
    list_vms | grep -qF "\"$1\""
}

function check_running() {
    list_running | grep -F "\"$1\""
}

function start_vm() {
    if ! check_exists "$1"; then
        echo "Virtual machine $1 doesn't exist"
        exit -1
    fi
    if check_running "$1"; then
        echo "Virtual machine $1 already running"
        exit -1
    fi
    vboxmanage startvm --type headless "$1"
}

function stop_vm() {
    if ! check_exists "$1"; then
        echo "Virtual machine $1 doesn't exist"
        exit -1
    fi
    if ! check_running "$1"; then
        echo "Virtual machine $1 isn't running"
        exit -1
    fi
    vboxmanage controlvm "$1" savestate
}

function clone_vm() {
    read -sp "Create a new virtual machine named '$1' [y/N]? " -N 1 TMP
    echo ""
    if [ "$TMP" == 'y' -o "$TMP" == 'Y' ]; then
        vboxmanage clonevm "$BASE_TEMPLATE" --mode all --options keepnatmacs --name "$1" --register
    fi
}

function destroy_vm() {
    echo "No way Jose. If you're really sure, destroy it via the GUI"
    exit -1
}

if [ "$1" == "list" ]; then
    list_vms
elif [ "$1" == "status" ]; then
    list_running
elif [ "$1" == "start" -a ! -z "$2" ]; then
    start_vm "$2"
elif [ "$1" == "stop" -a ! -z "$2" ]; then
    stop_vm "$2"
elif [ "$1" == "create" -a ! -z "$2" ]; then
    clone_vm "$2"
elif [ "$1" == "destroy" -a ! -z "$2" ]; then
    destroy_vm "$1"
elif [ -z "$1" ]; then
    list_running
    echo "Use 'vm list' to list vms or 'vm help' for help"
else
    show_help
    exit -1
fi