#!/bin/bash

. $PWD/scripts/function.sh

echo "Building guest kernel version $KERNELVERSION"

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

mkdir -p $BUILDDIR
cd $BUILDDIR

if [ ! -f "$KERNELTARBALL" ]
then
	url=ftp://ftp.kernel.org/pub/linux/kernel/v3.x/$KERNELTARBALL
	log_action "Downloading $url"
	execute "wget -q $url"
fi

if [[ $KERNELPATCH && ! -f "$KERNELPATCH" ]]
then
	url=http://download.strongswan.org/uml/$KERNELPATCH
	log_action "Downloading $url"
	execute "wget -q $url"
fi

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

KERNELDIR=$BUILDDIR/$KERNEL
cd $KERNELDIR

if [ $KERNELPATCH ]
then
	log_action "Applying kernel patch"
	bzcat ../$KERNELPATCH | patch -p1 >>$LOGFILE 2>&1
	log_status $?
	[ $? -eq 0 ] || exit 1
fi

execute "cp $KERNELCONFIG .config" 0

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

log_action "Compiling the kernel"
execute "make -j5"