#!/bin/bash
#
# Copyright (c) 2007, Bjoern B. Brandenburg <bbb [at] cs.unc.edu>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the copyright holder nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#

MENU="/boot/grub/menu.lst"


BACK="(c) 2007 Bjoern Brandenburg"
TITLE="GRUB Boot Kernel Selector v0.1"

TMPFILE=`mktemp`
(egrep '^title' $MENU | sed 's/title *//' | awk '
	BEGIN {c = 0} \
	{print c " \"" $0  "\""; c++ } \
	
' | xargs dialog --title "$TITLE" --backtitle "$BACK"  \
--cancel-label "Keep old default" --ok-label "Select new default" \
--menu "Choose default kernel: " 23 60 16 ) 2> $TMPFILE
OK=$?

clear

if [[ $OK == 0 ]]; then
    CHOICE=`cat $TMPFILE`
    sed -ibak "s/^default *[0123456789]\+$/default $CHOICE/" $MENU 
    echo "New default set to ${CHOICE}."
else
    echo "Keeping old default kernel."
fi

rm $TMPFILE