#!/bin/bash

# cd in this command's directory
cd $(dirname $0)

########## globals
RAM=1024
DISK_SIZE=10G
HDA=hdd-cow2-${DISK_SIZE}.img
QEMU_CREATE_IMAGE="qemu-img create -f qcow2 $HDA ${DISK_SIZE}"

SCRIPT=qemu-ifup
TAP="tap,script=$SCRIPT"

########## from the test environment
# expected vars are MACADDR, NODE_ISO, HOSTNAME, IP and TARGET_ARCH
CONFIG=qemu.conf
[ -f "$CONFIG" ] || { echo "Config file for qemu $CONFIG not found in $(pwd)" ; exit 1 ; }
. $CONFIG

# the launcher, depending on local/target archs
# make sure to check qemu-kill-node for consistency
archs="$(uname -i)+$TARGET_ARCH"
case $archs in
    i386+i386)		QEMU=qemu;;
    i386+x86_64)	QEMU=qemu-system-x86_64;;
    x86_64+i386)	QEMU=qemu;;
    x86_64+x86_64)	QEMU=qemu-system-x86_64;;
esac

#Creating new HDA if needed only
#using qcow2 disk image format which is essential to support VM snapshots
if [ -f $HDA ] ; then
    echo "Using existing $HDA"
else
    echo -n "Creating hard disk image (${DISK_SIZE}) as $HDA .. "
    img=$($QEMU_CREATE_IMAGE)
    if [ -z "$img" ];then
	echo "Failed"
	exit 1
    fi
    echo "Done"
fi

rm -f qemu.pid

#Command for running the Qemu Emulator
ARGS="-boot d  -net nic,macaddr=${MACADDR} -net $TAP, -cdrom ${NODE_ISO} -hda ${HDA} -m ${RAM} -nographic -pidfile qemu.pid"
echo "Running $QEMU $ARGS < /dev/null"
exec $QEMU $ARGS < /dev/null