#!/bin/bash

#

# This script takes the merged config files and processes them through oldconfig

# and listnewconfig

die()

{

	echo "$1"

	exit 1

}

# stupid function to find top of tree to do kernel make configs

switch_to_toplevel()

{

	path="$(pwd)"

	while test -n "$path"

	do

		test -d $path/firmware && \

			test -e $path/MAINTAINERS && \

			test -d $path/drivers && \

			break

		path="$(dirname $path)"

	done

	test -n "$path"  || die "Can't find toplevel"

	echo "$path"

}

checkoptions()

{

	/usr/bin/awk '

		/is not set/ {

			split ($0, a, "#");

			split(a[2], b);

			if (NR==FNR) {

				configs[b[1]]="is not set";

			} else {

				if (configs[b[1]] != "" && configs[b[1]] != "is not set")

					 print "Found # "b[1] " is not set, after generation, had " b[1] " " configs[b[1]] " in Source tree";

			}

		}

		/=/     {

			split ($0, a, "=");

			if (NR==FNR) {

				configs[a[1]]=a[2];

			} else {

				if (configs[a[1]] != "" && configs[a[1]] != a[2])

					 print "Found "a[1]"="configs[a[1]]" after generation, had " a[1]"="a[2]" in Source tree";

			}

		}

	' $1 $2 > .mismatches

	if test -s .mismatches

	then

		echo "Error: Mismatches found in configuration files"

		cat .mismatches

		exit 1

	fi

}

function process_configs()

{

	# assume we are in $source_tree/configs, need to get to top level

	pushd $(switch_to_toplevel)

	for cfg in $SCRIPT_DIR/${PACKAGE_NAME}${KVERREL}${SUBARCH}*.config

	do

		arch=$(head -1 $cfg | cut -b 3-)

		cfgtmp="${cfg}.tmp"

		cfgorig="${cfg}.orig"

		cat $cfg > $cfgorig

		echo -n "Processing $cfg ... "

		# an empty grep is good but leaves a return value, so use # 'true' to bypass

		make ARCH=$arch KCONFIG_CONFIG=$cfg listnewconfig | grep -E 'CONFIG_' > .newoptions || true

		if test -n "$NEWOPTIONS" && test -s .newoptions

		then

			echo "Found unset config items, please set them to an appropriate value"

			cat .newoptions

			rm .newoptions

			exit 1

		fi

		rm .newoptions

		make ARCH=$arch KCONFIG_CONFIG=$cfg oldnoconfig > /dev/null || exit 1

		echo "# $arch" > ${cfgtmp}

		cat "${cfg}" >> ${cfgtmp}

		if test -n "$CHECKOPTIONS"

		then

			checkoptions $cfgtmp $cfgorig

		fi

		mv ${cfgtmp} ${cfg}

		rm ${cfgorig}

		echo "done"

	done

	rm "$SCRIPT_DIR"/*.config.old

	popd > /dev/null

	echo "Processed config files are in $SCRIPT_DIR"

}

NEWOPTIONS=""

CHECKOPTIONS=""

while [[ $# -gt 0 ]]

do

	key="$1"

	case $key in

		-n)

			NEWOPTIONS="x"

			;;

		-c)

			CHECKOPTIONS="x"

			;;

		*)

			break;;

	esac

	shift

done

PACKAGE_NAME="${1:-kernel}" # defines the package name used

KVERREL="$(test -n "$2" && echo "-$2" || echo "")"

SUBARCH="$(test -n "$3" && echo "-$3" || echo "")"

SCRIPT="$(readlink -f $0)"

OUTPUT_DIR="$PWD"

SCRIPT_DIR="$(dirname $SCRIPT)"

# to handle this script being a symlink

cd $SCRIPT_DIR

process_configs