#!/bin/bash
#
# author: hackbard@hackdaworld.dyndns.org
#
# create a kernel binary package
#

config=""
name=""
builddir=""
homedir=$PWD

while [ "$1" ] ; do
	case "$1" in
		-config)	config=$2	; shift 2 ;;
		-name)		name=$2		; shift 2 ;;
		-dir)		builddir=$2	; shift 2 ;;
		*)
			echo
			echo "usage:"
			echo
			echo "-config <kernel config file>"
			echo "-name <kernel name>"
			echo "-dir <build dir>"
			echo
			exit 1 ;;
	esac
done

. ./Config

if [ "$hdw_arch" != "ia32" ] ; then
	echo "warning: only ia32 supported by now"
	echo "hack me ... "
	exit 1
fi

[ -z "$config" ] && config="./misc/arch/${hdw_arch}/linux.config"
[ -z "$name" ] && name="custom-$hdw_arch"
[ -z "$builddir" ] && builddir="/tmp" 

if [ ! -f $config ] ; then
	echo "$config doesn't exist, aborting ..."
	exit 1
fi

if [ ! -d $builddir ] ; then
	echo "$builddir doesn't exist, aborting ..."
	exit 1
fi

kerpkg="`grep '^#\ \[D\]' ./packages/base/linux/linux | awk '{ print $3 }'`"
kerver="`grep '^#\ \[V\]' ./packages/base/linux/linux | awk '{ print $3 }'`"

trg=$homedir/kernel-image-${kerver}_${name}.tar.bz2
if [ -f $trg ] ; then
	echo "image $trg already exists, aborting ..."
	exit 1
fi

[ ! -f ./download/base/linux/$kerpkg ] && ./scripts/Download -package linux

# backing up old kernel + modules
kerbackup=no
if [ -f /boot/vmlinuz_$kerver ] ; then
	mv /boot/vmlinuz_$kerver /boot/vmlinuz_${kerver}__orig
	kerbackup=yes
fi
modbackup=no
if [ -d /lib/modules/$kerver ] ; then
	mv /lib/modules/$kerver /lib/modules/${kerver}__orig
	modbackup=yes
fi

# build kernel & modules
kerarch=${hdw_arch//ia32/i386}
cp $config $builddir/linux.config
rm -rf $builddir/linux-$kerver
tar xfj ./download/base/linux/$kerpkg -C $builddir
cd $builddir/linux-$kerver
mv ../linux.config .config
cd include && ln -sf asm-${kerarch} asm && cd ..
yes "" | make oldconfig
make bzImage modules modules_install
cp arch/$kerarch/boot/bzImage /boot/vmlinuz_$kerver
cp .config /boot/kernel-config-$kerver-$name

# create the package
cd /
tar --use-compress-program=bzip2 -cf $trg lib/modules/$kerver \
	boot/vmlinuz_$kerver /boot/kernel-config-$kerver-$name

cd $homedir

# restore kernel & modules
rm -f /boot/vmlinuz_$kerver
[ "$kerbackup" = "yes" ] && \
	mv /boot/vmlinuz_${kerver}__orig /boot/vmlinuz_$kerver
rm -rf /lib/modules/$kerver
[ "$modbackup" = "yes" ] && \
	mv /lib/modules/${kerver}__orig /lib/modules/$kerver

echo
echo "done"
echo