#!/bin/dash

KERNEL_VERSION=4.4.187
#KERNEL_VERSION=4.9.120
#KERNEL_VERSION=4.14.63
KERNEL_MAJOR_VERSION=v4.x
KERNEL_PAGE=https://cdn.kernel.org
DEVICE_NAME=generic
OUT_DIRECTORY=out

#prepare
_PWD=`pwd`
mkdir -p $OUT_DIRECTORY/lib/modules

echo "Download kernel"
if [ ! -f linux-$KERNEL_VERSION.tar.xz ]; then
	wget -c $KERNEL_PAGE/pub/linux/kernel/$KERNEL_MAJOR_VERSION/linux-$KERNEL_VERSION.tar.xz
fi

echo "Unpack kernel"
tar -xvf linux-$KERNEL_VERSION.tar.xz
echo "Copy config to kernel"
cp configs/$DEVICE_NAME/generic-$KERNEL_VERSION ./linux-$KERNEL_VERSION/.config
echo "Compile kernel"
cd ./linux-$KERNEL_VERSION
make -j4
make INSTALL_MOD_PATH=$_PWD/$OUT_DIRECTORY/  modules_install



#output results
echo "Copy results to out"
cd $_PWD
cp ./linux-$KERNEL_VERSION/arch/x86_64/boot/bzImage $_PWD/$OUT_DIRECTORY/vmlinuz-xos
cp ./linux-$KERNEL_VERSION/vmlinux $_PWD/$OUT_DIRECTORY/vmlinux-xos