#!/bin/sh -x

CLEAN_SRC=${CLEAN_SRC:-NO}

PRGNAM=linux
VERSION=${VERSION:-$(echo linux-*.tar.?z* | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}

ARCH=$(uname -m)

CWD=$(pwd)
SOURCES=/usr/src/
TAG=cyco
TMP=/tmp/$TAG
PKG=$TMP/pkg-$PRGNAM
OUTPUT=/tmp

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

SRC_URL="http://www.kernel.org/pub/linux/kernel/v$(echo  \"$VERSION\" | sed 's|\([0-9]*\.[0-9]*\).*|\1|')$(echo \"$VERSION\" | grep -q \"\-rc\" && echo \"/testing\" )"

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

if [ $CLEAN_SRC != "NO" ]; then
    [ ! -e $CWD/$PRGNAM-$VERSION.tar.?z* ] && wget -c "$SRC_URL/$PRGNAM-$VERSION.tar.bz2" -O $CWD/$PRGNAM-$VERSION.tar.bz2
    [ ! -e $SOURCES ] && mkdir -p $SOURCES
    tar xf $CWD/$PRGNAM-$VERSION.tar.?z* -C $SOURCES
fi

cd $SOURCES/$PRGNAM-$VERSION

if [ $CLEAN_SRC != "NO" ]; then
    [ -e $CWD/patches/ ] && \
        for p in $CWD/patches/*.{diff,patch} ; do
        patch -p1 -i $p || exit 1 # if patching fail we want to know
    done
    [ -e $CWD/patches/$VERSION ] && \
        for p in $CWD/patches/$VERSION/*.{diff,patch} ; do
        patch -p1 -i $p || exit 1 # if patching fail we want to know
    done
fi
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

KERNEL_TAG=$(grep "CONFIG_LOCALVERSION=" .config | sed 's|CONFIG_LOCALVERSION=||' | tr -d \" )
KERNEL_VERSION=$(grep -o "[0-9]\+\.[0-9]\+.*[0-9]" .config)$KERNEL_TAG

mkdir -p $PKG/boot/$KERNEL_VERSION
cp .config System.map arch/x86/boot/bzImage $PKG/boot/$KERNEL_VERSION
mv $PKG/boot/$KERNEL_VERSION/{.,}config

mkdir -p $PKG/install
cat <<EOF > $PKG/install/doinst.sh
cp /etc/lilo.conf /etc/lilo.conf.orig
grep -q "image = /boot/$KERNEL_VERSION/bzImage" /etc/lilo.conf || \
cat <<EOLILO >> /etc/lilo.conf
# Linux bootable partition config begins
image = /boot/$KERNEL_VERSION/bzImage
  root = /dev/sda1
  label = $KERNEL_VERSION
  read-only
# Linux bootable partition config ends

EOLILO

sed -i "s|default=.*|default=$KERNEL_VERSION|" /etc/lilo.conf

lilo
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
makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$(echo $KERNEL_TAG | tr - _)-$ARCH-$BUILD$TAG.txz