1 files changed, 137 insertions, 0 deletions
diff --git a/configs/build_configs.sh b/configs/build_configs.sh
new file mode 100755
index 000000000..15ab6b380
--- /dev/null
+++ b/configs/build_configs.sh
@@ -0,0 +1,137 @@
+#!/bin/bash
+#
+# This script merges together the hierarchy of CONFIG_* files under generic
+# and debug to form the necessary $PACKAGE_NAME<version>-<arch>-<variant>.config
+# files for building RHEL kernels, based on the contents of a control file
+
+PACKAGE_NAME="${1:-kernel}" # defines the package name used
+KVERREL="${2:-}"
+SUBARCH="${3:-}" # defines a specific arch
+SCRIPT="$(readlink -f $0)"
+OUTPUT_DIR="$PWD"
+SCRIPT_DIR="$(dirname $SCRIPT)"
+
+# to handle this script being a symlink
+cd $SCRIPT_DIR
+
+set errexit
+set nounset
+
+control_file="config_generation"
+
+cleanup()
+{
+	rm -f config-*
+}
+
+die()
+{
+	echo "$1"
+	cleanup
+	exit 1
+}
+
+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
+	order=$3
+	name=$OUTPUT_DIR/$PACKAGE_NAME-$archvar.config
+	echo -n "Building $name ... "
+	touch config-merging config-merged
+
+	# apply based on order
+	skip_if_missing=""
+	for o in $order
+	do
+		for config in $(echo $configs | sed -e 's/:/ /g')
+		do
+			cfile="config-$o-$config"
+
+			test -n "$skip_if_missing" && test ! -e $cfile && continue
+
+			perl merge.pl $cfile config-merging > config-merged
+			if [ ! $? -eq 0 ]; then
+				die "Failed to merge $cfile"
+			fi
+			mv config-merged config-merging
+		done
+
+		# first configs in $order is baseline, all files should be
+		# there.  second pass is overrides and can be missing.
+		skip_if_missing="1"
+	done
+	if [ "x$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"
+}
+
+while read line
+do
+	if [ $(echo "$line" | grep -c "^#") -ne 0 ]; then
+		continue
+	elif [ $(echo "$line" | grep -c "^$") -ne 0 ]; then
+		continue
+	elif [ $(echo "$line" | grep -c "^ORDER") -ne 0 ]; then
+		order=$(echo "$line" | cut -f2 -d"=")
+		for o in $order
+		do
+			glist=$(find $o -type d)
+			for d in $glist
+			do
+				combine_config_layer $d
+			done
+		done
+	else
+		arch=$(echo "$line" | cut -f1 -d"=")
+		configs=$(echo "$line" | cut -f2 -d"=")
+
+		if [ -n "$SUBARCH" -a "$SUBARCH" != "$arch" ]; then
+			continue
+		fi
+
+		merge_configs $arch $configs "$order"
+	fi
+done < $control_file
+
+# A passed in kernel version implies copy to final location
+# otherwise defer to another script
+if test -n "$KVERREL"
+then
+	for i in kernel-*.config
+	do
+		NEW="$(echo $i | sed "s/$PACKAGE_NAME-$SUBARCH/$PACKAGE_NAME-$KVERREL-$SUBARCH/")"
+		mv $i $NEW
+	done
+fi
+
+cleanup