#!/bin/bash

. debian/debian.env

# Script to merge all configs and run 'make silentoldconfig' on it to wade out bad juju.
# Then split the configs into distro-commmon and flavour-specific parts

# We have to be in the top level kernel source directory
if [ ! -f MAINTAINERS ] || [ ! -f Makefile ]; then
	echo "This does not appear to be the kernel source directory." 1>&2
	exit 1
fi

mode=${1:?"Usage: $0 [oldconfig|editconfig]"}
yes=0
case "$mode" in
    update*configs)  mode='silentoldconfig' ;;
    default*configs) mode='oldconfig'; yes=1 ;;
    edit*configs)    ;; # All is good
    gen*configs)     mode='genconfigs' ;; # All is good
    dump*configs)    mode='config'; yes=1 ;;
    *) echo "$0 called with invalid mode" 1>&2
       exit 1 ;;
esac
kerneldir="`pwd`"
confdir="$kerneldir/${DEBIAN}/config"
variant="$2"

. $DEBIAN/etc/kernelconfig

bindir="`pwd`/${DROOT}/scripts/misc"
common_conf="$confdir/config.common.$family"
tmpdir=`mktemp -d`
mkdir "$tmpdir/CONFIGS"

if [ "$mode" = "genconfigs" ]; then
	keep=1
	mode="oldconfig"
	test -d CONFIGS || mkdir CONFIGS
fi

for arch in $archs; do
	rm -rf build
	mkdir build

	# Map debian archs to kernel archs
	case "$arch" in
		ppc64|ppc64el)	kernarch="powerpc"	;;
		amd64)		kernarch="x86_64"	;;
		lpia)		kernarch="x86" 		;;
		sparc)		kernarch="sparc64"	;;
		armel|armhf)	kernarch="arm"		;;
		s390x)		kernarch="s390"		;;
		*)		kernarch="$arch"	;;
	esac

	archconfdir=$confdir/$arch
	flavourconfigs=$(cd $archconfdir && ls config.flavour.*)

	# Merge configs
	# We merge config.common.ubuntu + config.common.<arch> +
	# config.flavour.<flavour>

	for config in $flavourconfigs; do
		fullconf="$tmpdir/$arch-$config-full"
		case $config in
		*)
			: >"$fullconf"
			if [ -f $common_conf ]; then
				cat $common_conf >> "$fullconf"
			fi
			if [ -f $archconfdir/config.common.$arch ]; then
				cat $archconfdir/config.common.$arch >> "$fullconf"
			fi
			cat "$archconfdir/$config" >>"$fullconf"
			if [ -f $confdir/OVERRIDES ]; then
				cat $confdir/OVERRIDES >> "$fullconf"
			fi
			;;
		esac
	done

	for config in $flavourconfigs; do
		if [ -f $archconfdir/$config ]; then
			fullconf="$tmpdir/$arch-$config-full"
			cat "$fullconf" > build/.config
			# Call oldconfig or menuconfig
			case "$mode" in
			    editconfigs)
				# Interactively edit config parameters
				while : ; do
					echo -n "Do you want to edit config: $arch/$config? [Y/n] "
					read choice
					
					case "$choice" in
					y* | Y* | "" )
						make O=`pwd`/build ARCH=$kernarch menuconfig
						break ;;
					n* | N* )
						# 'silentoldconfig' prevents
						# errors for '-' options set
						# in common config fragments
						make O=`pwd`/build ARCH=$kernarch silentoldconfig
						break ;;
					*)
						echo "Entry not valid"
					esac
				done
				;;
			    *)
				echo "* Run $mode (yes=$yes) on $arch/$config ..."
				if [ "$yes" -eq 1 ]; then
					yes "" | make O=`pwd`/build ARCH=$kernarch "$mode"
				else
					make O=`pwd`/build ARCH=$kernarch "$mode"
				fi ;;
			esac
			cat build/.config > $archconfdir/$config
			cat build/.config > "$tmpdir/CONFIGS/$arch-$config"
			if [ "$keep" = "1" ]; then
				cat build/.config > CONFIGS/$arch-$config
			fi
		else
			echo "!! Config not found $archconfdir/$config..."
		fi
	done

	echo "Running splitconfig.pl for $arch"
	echo

	# Can we make this more robust by avoiding $tmpdir completely?
	# This approach was used for now because I didn't want to change
	# splitconfig.pl
	(cd $archconfdir; $bindir/splitconfig.pl config.flavour.*; mv config.common \
	 config.common.$arch; cp config.common.$arch $tmpdir)
done

rm -f $common_conf

# Now run splitconfig.pl on all the config.common.<arch> copied to
# $tmpdir
(cd $tmpdir; $bindir/splitconfig.pl *)
(
	cd $confdir;
	rm -f *-full
	grep -v 'is UNMERGABLE' <$tmpdir/config.common >$common_conf
	for arch in $archs; do
		grep -v 'is UNMERGABLE' <$tmpdir/config.common.$arch \
			>$arch/config.common.$arch
	done
)

echo ""
echo "Running config-check for all configurations ..."
echo ""
fail=0
for arch in $archs; do
	archconfdir=$confdir/$arch
	flavourconfigs=$(cd $archconfdir && ls config.flavour.*)
	for config in $flavourconfigs; do
		flavour="${config##*.}"
		if [ -f $archconfdir/$config ]; then
			fullconf="$tmpdir/CONFIGS/$arch-$config"
			"$bindir/../config-check" "$fullconf" "$arch" "$flavour" "$confdir" "0" || let "fail=$fail+1"
		fi
	done
done

if [ "$fail" != 0 ]; then
	echo ""
	echo "*** ERROR: $fail config-check failures detected"
	echo ""
fi

rm -rf build