#!/bin/sh

set -e

CLEAN_SRC=${CLEAN_SRC:-NO}

CWD=$(pwd)

PRGNAM=$(basename $CWD)
VERSION=${VERSION:-$(curl https://www.kernel.org/feeds/kdist.xml | grep -o "[0-9.]*: stable" | head -n1 | cut -d: -f1)}
BUILD=${BUILD:-1}

ARCH=$(uname -m)

SOURCES=/usr/src
TAG=cyco
TMP=/tmp/$TAG
PKG=$TMP/pkg-$PRGNAM
OUTPUT=/tmp

NUMJOBS=${NUMJOBS:-" -j4 "}

SRC_URL="https://cdn.kernel.org/pub/linux/kernel/v$(echo $VERSION | cut -d. -f1).x"

rm -fr $PKG
if [ $CLEAN_SRC != "NO" ] ; then
    rm -fr $SOURCES/linux-$VERSION

    [ ! -e $CWD/linux-$VERSION.tar.?z* ] && wget -c "$SRC_URL/linux-$VERSION.tar.xz" -O $CWD/linux-$VERSION.tar.xz
    [ ! -e $SOURCES ] && mkdir -p $SOURCES
    tar xf $CWD/linux-$VERSION.tar.xz -C $SOURCES
fi

cd $SOURCES/linux-$VERSION

if [ $CLEAN_SRC != "NO" ] || [ ! -e .config ] ; then
    if [ -e $CWD/config-$VERSION ] ; then
        cp $CWD/config-$VERSION .config
    else
        if [ -e $CWD/config ]; then
            cp $CWD/config .config
        else
            zcat /proc/config.gz > .config
        fi
    fi
fi

make oldconfig $*
make $NUMJOBS
make modules_install INSTALL_MOD_PATH=$PKG

mkdir -p $PKG/boot/
cp System.map $PKG/boot/System.map-gwh-$VERSION
cp .config $PKG/boot/config-gwh-$VERSION
cp arch/${ARCH}/boot/bzImage $PKG/boot/vmlinuz-gwh-$VERSION
( cd $PKG/boot/
  ln -s vmlinuz-gwh-$VERSION vmlinuz-gwh
)

mkdir -p $PKG/install
cat <<EOF > $PKG/install/doinst.sh
cp /boot/elilo-x86_64.efi /boot/efi/EFI/Slackware/elilo.efi

cp /boot/vmlinuz-gwh-$VERSION /boot/efi/EFI/Slackware/vmlinuz-gwh
cp /boot/intel-ucode.cpio /boot/efi/EFI/Slackware/
eval $(/usr/share/mkinitrd/mkinitrd_command_generator.sh -a '-P /boot/intel-ucode.cpio' -k $VERSION -r -m crc32-pclmul:crc32c-intel:crc32_generic$(lspci | grep -iq radeon && echo ':amdgpu:radeon'))
cp /boot/initrd.gz /boot/efi/EFI/Slackware/initrd-gwh.gz
EOF

VERSION=$(echo $VERSION | tr - _)
cat <<EOF > $PKG/install/slack-desc
$PRGNAM-$VERSION: $PRGNAM-$VERSION (kernel)
$PRGNAM-$VERSION:
$PRGNAM-$VERSION: Linux is a clone of the operating system Unix, written from scratch by
$PRGNAM-$VERSION: Linus Torvalds with assistance from a loosely-knit team of hackers
$PRGNAM-$VERSION: across the Net. It aims towards POSIX and Single UNIX Specification
$PRGNAM-$VERSION: compliance.
$PRGNAM-$VERSION:
$PRGNAM-$VERSION: It has all the features you would expect in a modern fully-fledged Unix
$PRGNAM-$VERSION:
$PRGNAM-$VERSION: http://www.kernel.org
$PRGNAM-$VERSION:
EOF

cd $PKG
rm -f $PKG/{,usr/}lib$(uname -m | grep -o 64)/*.la
makepkg -l y -c n $OUTPUT/$PRGNAM-${VERSION}-$ARCH-$BUILD$TAG.txz