#!/bin/bash
#
# QEMU network configuration script to bring down tap devices. This
# utility needs to be run as root, and will use the tunctl binary
# from a Poky sysroot. 
#
# If you find yourself calling this script a lot, you can add the
# the following to your /etc/sudoers file to be able to run this
# command without entering your password each time:
#
# <my-username> ALL=NOPASSWD: /path/to/poky-qemu-ifup
# <my-username> ALL=NOPASSWD: /path/to/poky-qemu-ifdown
#
# Copyright (c) 2006-2010 Intel Corp.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

usage() {
	echo "sudo $0 <tap-dev> <native-sysroot-basedir>"
}

if [ $EUID -ne 0 ]; then
	echo "Error: This script (poky-qemu-ifdown) must be run with root privileges"
	exit 1
fi

if [ $# -ne 2 ]; then
	usage
	exit 1
fi

TAP=$1
NATIVE_SYSROOT_DIR=$2

TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl
if [ ! -e "$TUNCTL" ]; then
	echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin'"

	if [[ "$NATIVE_SYSROOT_DIR" =~ ^\/opt\/poky ]]; then
		echo "This shouldn't happen - something is wrong with your toolchain installation"
	else
		echo "Have you run 'bitbake meta-ide-support'?"
	fi

	exit 1
fi

$TUNCTL -d $TAP