#!/bin/bash
# build an UML kernel based on a vanilla kernel and UML patch
#
# Copyright (C) 2004  Eric Marchionni, Patrik Rayo
# Zuercher Hochschule Winterthur
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
#
# 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.

. $PWD/scripts/function.sh

echo "Building guest kernel version $KERNELVERSION"

[ -f "$KERNEL" ] || die "Kernel $KERNEL not found"
[ -f "$KERNELCONFIG" ] || die "Kernel config $KERNELCONFIG not found"

if [ $UMLPATCH ]; then
	[ -f "$UMLPATCH" ] || die "Patch $UMLPATCH not found"
fi

mkdir -p $BUILDDIR
cd $BUILDDIR

log_action "Unpacking kernel"
execute "tar xjf $KERNEL"

KERNELDIR=${BUILDDIR}/linux-${KERNELVERSION}
ln -fs linux-${KERNELVERSION} linux
cd $KERNELDIR

if [ $UMLPATCH ]; then
	log_action "Applying uml patch"
	bzcat $UMLPATCH | patch -p1 >> $LOGFILE 2>&1
	log_status $?
fi

execute "cp $KERNELCONFIG .config" 0

echo "!!"
echo "!! Creating kernel configuration, you might get prompted for new parameters!"
echo "!!"
make oldconfig ARCH=um 2>&1 | tee -a $LOGFILE

log_action "Compiling the kernel"
execute "make -j5 linux ARCH=um"

log_action "Copying kernel to '${BUILDDIR}/linux-uml-${KERNELVERSION}'"
execute "mv linux ${BUILDDIR}/linux-uml-${KERNELVERSION}"