#!/bin/sh

set -e

CWD=$(pwd)

PRGNAM=$(basename $CWD)-$(hostname -s)
BUILD=${BUILD:-1}
BRANCH=${BRANCH:-stable}        # stable ; mainline
ARCH=$(uname -m)

TAG=gwh
TMP=/tmp/$TAG
PKG=$TMP/pkg-$PRGNAM
OUTPUT=/tmp

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

GIT=${GIT:-"NO"}

rm -fr $PKG

if [ $GIT == "YES" ]; then
    REPOSITORY=${REPOSITORY:-/home/installs/SlackBuilds/repositories/$PRGNAM}
    [ ! -e $REPOSITORY ] && git clone https://github.com/torvalds/linux.git $REPOSITORY

    cd $REPOSITORY
    git pull
    VERSION="$(git log -1 --format=%h_%ad --date=format:%Y.%m.%d)"
else
    VERSION=${VERSION:-$(curl https://www.kernel.org/feeds/kdist.xml | grep -o "[0-9.rc-]*: $BRANCH" | head -n1 | cut -d: -f1)}

    if [ $BRANCH == "stable" ]; then
	SRC_URL="https://cdn.kernel.org/pub/linux/kernel/v$(echo $VERSION | cut -d. -f1).x"
    else
	SRC_URL="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot"
    fi
    [ ! -e $CWD/linux-$VERSION.tar.?z* ] && wget -c "$SRC_URL/linux-$VERSION.tar.gz" -O $CWD/linux-$VERSION.tar.gz
    mkdir -p $PKG/usr/src/
    tar xf $CWD/linux-$VERSION.tar.gz -C $PKG/usr/src/

    cd $PKG/usr/src/linux-$VERSION
fi

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

make oldconfig $*

# [ ! -e $CWD/config-$VERSION ] && cp .config $CWD/config-$VERSION

make $NUMJOBS
make modules_install INSTALL_MOD_PATH=$PKG

VERSION=$(basename $(ls $PKG/lib/modules/ | head -n1))

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
)

make clean

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

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