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#!/bin/bash
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#
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# This script takes the merged config files and processes them through oldconfig
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# and listnewconfig
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#
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usage()
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{
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	echo "process_configs.sh [ -n|-c|-t ] package_name kernel_version [cross_opts]"
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	echo "     -n: error on unset config options"
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	echo "     -c: error on mismatched config options"
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	echo "     -t: test run, do not overwrite original config"
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	echo "     -w: error on misconfigured config options"
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	exit 1
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}
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die()
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{
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	echo "$1"
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	exit 1
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}
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# stupid function to find top of tree to do kernel make configs
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switch_to_toplevel()
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{
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	path="$(pwd)"
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	while test -n "$path"
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	do
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		test -d $path/firmware && \
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			test -e $path/MAINTAINERS && \
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			test -d $path/drivers && \
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			break
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		path="$(dirname $path)"
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	done
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	test -n "$path"  || die "Can't find toplevel"
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	echo "$path"
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}
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checkoptions()
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{
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	/usr/bin/awk '
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		/is not set/ {
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			split ($0, a, "#");
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			split(a[2], b);
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			if (NR==FNR) {
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				configs[b[1]]="is not set";
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			} else {
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				if (configs[b[1]] != "" && configs[b[1]] != "is not set")
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					 print "Found # "b[1] " is not set, after generation, had " b[1] " " configs[b[1]] " in Source tree";
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			}
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		}
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		/=/     {
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			split ($0, a, "=");
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			if (NR==FNR) {
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				configs[a[1]]=a[2];
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			} else {
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				if (configs[a[1]] != "" && configs[a[1]] != a[2])
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					 print "Found "a[1]"="a[2]" after generation, had " a[1]"="configs[a[1]]" in Source tree";
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			}
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		}
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	' $1 $2 > .mismatches
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	if test -s .mismatches
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	then
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		echo "Error: Mismatches found in configuration files"
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		cat .mismatches
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		exit 1
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	fi
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}
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function process_configs()
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{
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	# assume we are in $source_tree/configs, need to get to top level
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	pushd $(switch_to_toplevel) &>/dev/null
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	for cfg in $SCRIPT_DIR/${PACKAGE_NAME}${KVERREL}*.config
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	do
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		arch=$(head -1 $cfg | cut -b 3-)
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		cfgtmp="${cfg}.tmp"
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		cfgorig="${cfg}.orig"
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		cat $cfg > $cfgorig
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		echo -n "Processing $cfg ... "
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		make ARCH=$arch ${CROSSOPTS} KCONFIG_CONFIG=$cfgorig listnewconfig >& .listnewconfig
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		grep -E 'CONFIG_' .listnewconfig > .newoptions
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		if test -n "$NEWOPTIONS" && test -s .newoptions
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		then
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			echo "Found unset config items, please set them to an appropriate value"
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			cat .newoptions
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			rm .newoptions
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			exit 1
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		fi
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		rm .newoptions
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		grep -E 'config.*warning' .listnewconfig > .warnings
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		if test -n "$CHECKWARNINGS" && test -s .warnings
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		then
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			echo "Found misconfigured config items, please set them to an appropriate value"
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			cat .warnings
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			rm .warnings
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			exit 1
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		fi
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		rm .warnings
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		rm .listnewconfig
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		make ARCH=$arch ${CROSSOPTS} KCONFIG_CONFIG=$cfgorig oldnoconfig > /dev/null || exit 1
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		echo "# $arch" > ${cfgtmp}
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		cat "${cfgorig}" >> ${cfgtmp}
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		if test -n "$CHECKOPTIONS"
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		then
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			checkoptions $cfg $cfgtmp
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		fi
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		# if test run, don't overwrite original
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		if test -n "$TESTRUN"
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		then
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			rm ${cfgtmp}
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		else
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			mv ${cfgtmp} ${cfg}
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		fi
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		rm ${cfgorig}
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		echo "done"
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	done
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	rm "$SCRIPT_DIR"/*.config*.old
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	popd > /dev/null
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	echo "Processed config files are in $SCRIPT_DIR"
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}
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NEWOPTIONS=""
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CHECKOPTIONS=""
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CHECKWARNINGS=""
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TESTRUN=""
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while [[ $# -gt 0 ]]
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do
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	key="$1"
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	case $key in
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		-h)
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			usage
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			;;
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		-n)
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			NEWOPTIONS="x"
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			;;
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		-c)
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			CHECKOPTIONS="x"
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			;;
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		-t)
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			TESTRUN="x"
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			;;
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		-w)
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			CHECKWARNINGS="x"
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			;;
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		*)
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			break;;
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	esac
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	shift
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done
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PACKAGE_NAME="${1:-kernel}" # defines the package name used
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KVERREL="$(test -n "$2" && echo "-$2" || echo "")"
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CROSSOPTS="$3"
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SCRIPT="$(readlink -f $0)"
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OUTPUT_DIR="$PWD"
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SCRIPT_DIR="$(dirname $SCRIPT)"
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# to handle this script being a symlink
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cd $SCRIPT_DIR
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process_configs