kvm

#!/bin/bash
set -e
BASEDIR=$(dirname $0)
export CONFIG_DIR="$HOME/.kvmrc"
function abort(){
    echo "Error: $@"
    print_usage
    exit -1
}

function print_usage(){
cat << EOF
qemu wrapper
Usage: $(basename $0) [<OPTIONS>] <VM NAME> 

Options:
    -d, --debug
        Enable debug mode.

    -h, --help
        Prints this help text.

    -q, --quiet
        Suppresses the use of qmpcat

    -s, --socket-file <FILE>
        Use specified file as socket file for qmpcat
EOF
}

function forward_port(){
    local src_port=$1
    local dest_port=$2
    [[ "${src_port}" =~ ^[1-9]+[0-9]{0,4}$ ]] || abort "Invalid source port: $src_port"
    [[ "${dest_port}" =~ ^[1-9]+[0-9]{0,4}$ ]] || abort "Invalid destination port: $dest_port"
    OPTS+=" -redir tcp:${src_port}::${dest_port}"
    OPTS+=" -redir udp:${src_port}::${dest_port}"
}

function check_config(){
    mkdir -p $CONFIG_DIR
    [ -f $CONFIG_DIR/default ] && return
    read -p "It seems you don't have a default config. Create one? [Y/n] " create_defaults
    [[ "$create_defaults" =~ [Nn] ]] && return
    cat >> $CONFIG_DIR/default << EOF
MEMORY=2048
KEYBOARD_LAYOUT="de"
# c for hard drive, d for cdrom
BOOT_DEVICE="c"
# Spawn a graphical window
OPTS="-vga std"
# Comment the above line and uncomment the below line to suppress the graphical window
#OPTS="-display none"
EOF

    cat >> $CONFIG_DIR/usbtest << EOF
source $CONFIG_DIR/default
BOOT_DEVICE="d"
# Uncomment the lines below as needed.
# Creation of a hard disk image will be proposed if needed
#DISK_IMAGE=/path/to/usbtest.img
#CDROM=/path/to/cdimage.iso
EOF
}

check_config

VM=""
NO_OPTS="n"
QUIET="n"
while [ $# -gt 0 ];do
    if [ "x$NO_OPTS" == "xy" ] && [[ "$1" =~ \-.* ]];then
        VM=$1
    else
        case $1 in
            '--')
                NO_OPTS="y"
                ;;
            '-h'|'--help')
                print_usage
                exit 0
                ;;
            '-d'|'--debug')
                set -ex
                ;;
            '-s'|'--socket-file')
		shift
		[ -n "$1" ] || abort "Option -s, --socket-file requires an argument!"
		SOCKET_FILE=$1
                ;;
            '-q'|'--quiet')
                QUIET="y"
                ;;
            *)
                if [ -n "$VM" ];then
                    abort "Too many VM names specified!"
                else
                    VM=$1
                fi
                ;;
        esac
    fi
    shift
done
if [ -z "$VM" ]; then
    echo "Error: Missing argument: VM"
    exit -1
elif [ ! -r "$CONFIG_DIR/$VM" ]; then
    echo "Error: VM $VM does not exist or is not readable!"
    exit -1
fi
source $CONFIG_DIR/$VM
if [ -n "$DISK_IMAGE" ] && [ ! -e "$DISK_IMAGE" ];then
    read -p "Hard disk image $DISK_IMAGE does not exit. Create it? [y/N]: " CREATE_DISK
    if [[ "$CREATE_DISK" =~ [YyJj] ]];then
        read -p "Enter size in GB: " SIZE
        qemu-img create "$DISK_IMAGE" -f qcow2 ${SIZE}G || exit -1
    fi
fi
OPTS+=" $@"
[ -n "$CDROM" ] && BOOT_DEVICE="d"

echo "Running qemu with options \"$OPTS\""
TEMP_FILE=${SOCKET_FILE:-$(mktemp)}
function run_qemu () {
    qemu-system-x86_64 \
        -k $KEYBOARD_LAYOUT \
        -enable-kvm \
        -m $MEMORY \
        -localtime \
        $( [ -n "$DISK_IMAGE" ] && [ -r "$DISK_IMAGE" ] && echo "-hda $DISK_IMAGE") \
        $( [ -n "$CDROM" ] && [ -r "$CDROM" ] && echo "-cdrom $CDROM") \
        -boot once=${BOOT_DEVICE},menu=on \
        -name "$VM_NAME" \
        -qmp unix:$TEMP_FILE,server,nowait \
        $OPTS 
    rm -f $TEMP_FILE
}

run_qemu &
sleep 1
if [ "x$QUIET" != "xy" ]; then
	[ -e $TEMP_FILE ] && $BASEDIR/qmpcat $TEMP_FILE
	rm -f $TEMP_FILE
fi