#!/bin/sh

# Reading system configuration informations, functions and package versions.
source ../sysinfos
source ../functions
source ../packages-list

# The ARCH variable must be exported for this script
#   eg. ARCH=powerpc

# We don't compile anything, we only install headers
##################################################################unset CROSS_COMPILE &&

# Applying patches (if any)
apply_patches ${1} &&

# Move files to their final destination 
mkdir -pv ${SYSROOT}/usr/src &&
cp -a ${LFS_TMP}/${1} ${SYSROOT}/usr/src &&

cd ${SYSROOT}/usr/src &&

# Create the link only if it does not exist. Otherwise, the
# new link will be created inside kernel directory.
rm -fv linux &&
ln -sfv ${1} linux &&

cd ${SYSROOT}/usr/src/${1} &&

# First step, install kernel API headers:
make mrproper &&
make headers_check &&
make INSTALL_HDR_PATH=dest headers_install &&
mkdir -pv ${SYSROOT}/usr/include &&
cp -rv dest/include/* ${SYSROOT}/usr/include &&

# Second, install HV kernel compilation script:
cat > ${SYSROOT}/usr/src/compile-kernel << "EOF" &&
#!/bin/sh

KERNEL_VERSION=$(basename $(pwd))
DEST=/boot

export ARCH=_ARCH_
export CROSS_COMPILE=_CROSS_COMPILE_
export SYSROOT=_SYSROOT_

KERNELMAKE="make -j 4"

${KERNELMAKE} bzImage &&

if cat .config | grep "CONFIG_MODULES=y" 1> /dev/null 2>&1; then
    ${KERNELMAKE} modules &&
    ${KERNELMAKE} INSTALL_MOD_PATH=${SYSROOT} modules_install
fi &&

cp arch/${ARCH}/boot/images/zImage.elf ${DEST}/vmlinuz-${KERNEL_VERSION} &&
cp arch/${ARCH}/boot/images/zImage.elf ${DEST}/vmlinuz-latest &&
cp System.map                          ${DEST}/System-${KERNEL_VERSION}.map &&
cp .config                             ${DEST}/config-${KERNEL_VERSION}

if [ $? -ne 0 ]; then
    echo "*** Kernel compilation error ***."
    exit 1
fi

exit 0
EOF

sed -i -e "s!_ARCH_!${ARCH}!g"                   ${SYSROOT}/usr/src/compile-kernel &&
sed -i -e "s!_CROSS_COMPILE_!${CROSS_COMPILE}!g" ${SYSROOT}/usr/src/compile-kernel &&
sed -i -e "s!_SYSROOT_!${SYSROOT}!g"             ${SYSROOT}/usr/src/compile-kernel &&

chmod -v u+x ${SYSROOT}/usr/src/compile-kernel

# Return last error
exit $?