#!/bin/bash

#

# This script merges together the hierarchy of CONFIG_* files under generic

# and debug to form the necessary $PACKAGE_NAME<version>-<arch>-<variant>.config

# files for building RHEL kernels, based on the contents of a control file

PACKAGE_NAME=kernel # defines the package name used

set errexit

set nounset

control_file="config_generation"

function combine_config_layer()

{

	dir=$1

	file="config-$(echo $dir | sed -e 's|/|-|g')"

	if [ $(ls $dir/ | grep -c "^CONFIG_") -eq 0 ]; then

		touch $file

		return

	fi

	cat $dir/CONFIG_* > $file

}

function merge_configs()

{

	archvar=$1

	arch=$(echo "$archvar" | cut -f1 -d"-")

	configs=$2

	name=$PACKAGE_NAME-$archvar.config

	echo -n "Building $name ... "

	touch config-merging config-merged

	for config in $(echo $configs | sed -e 's/:/ /g')

	do

		perl merge.pl config-$config config-merging > config-merged

		if [ ! $? -eq 0 ]; then

			exit

		fi

		mv config-merged config-merging

	done

	if [ "x$arch" == "xaarch64" ]; then

		echo "# arm64" > $name

	elif [ "x$arch" == "xppc64" ]; then

		echo "# powerpc" > $name

	elif [ "x$arch" == "xppc64le" ]; then

		echo "# powerpc" > $name

	elif [ "x$arch" == "xs390x" ]; then

		echo "# s390" > $name

	elif [ "x$arch" == "xarmv7hl" ]; then

		echo "# arm" > $name

	elif [ "x$arch" == "xi686" ]; then

		echo "# i386" > $name

	else

		echo "# $arch" > $name

	fi

	sort config-merging >> $name

	rm -f config-merged config-merging

	echo "done"

}

glist=$(find baseconfig -type d)

dlist=$(find debugconfig -type d)

for d in $glist $dlist

do

	combine_config_layer $d

done

while read line

do

	if [ $(echo "$line" | grep -c "^#") -ne 0 ]; then

		continue

	elif [ $(echo "$line" | grep -c "^$") -ne 0 ]; then

		continue

	else

		arch=$(echo "$line" | cut -f1 -d"=")

		configs=$(echo "$line" | cut -f2 -d"=")

		if [ -n "$SUBARCH" -a "$SUBARCH" != "$arch" ]; then

			continue

		fi

		merge_configs $arch $configs

	fi

done < $control_file

rm -f config-*