configs: Update scripts and spec file with layout changes

With the configs in the new place, update the scripts to find
them and utilize the base-generic and generic heirarchy to apply
configs and overrides.

Implement new process_configs.sh script that post-process the
config changes in a simple script and remove those commands
from the spec file.  Add option flags to preserve functionality.

config_generation is a simple rename of baseconfig -> generic and
debugconfig -> debug and arm64 -> aarach64.

build_configs.sh is modified to find configs in generic and base-generic and
then apply base-generic first and if any generic files, apply those next.  The
generic directory is used as an overrides and is expected to be empty for
Fedora initially.

kernel.spec is modified to use process_configs.sh instead of all the
commands in the spec file.  Enabled spec options are translated to
script options.  The config manipulation is moved to be grouped
with all config manipulation commands.  This makes 'cd configs/' simpler.
Now all config scripts and executiion are done in configs/ directory.

v1 -> v2:
* the scripts were not working with SUBARCH correctly
* checkoptions was using wrong comparison file
* passing wrong kernel version to process_configs in spec file

v2 -> v3:
(incorporate Laura A's feedback)
* update README.txt
* fix build_configs.sh warnings
* Output info message on listnewconfig failure

1 files changed, 136 insertions, 0 deletions

diff --git a/configs/process_configs.sh b/configs/process_configs.sh
new file mode 100755
index 000000000..4de45d65a
--- /dev/null
+++ b/configs/process_configs.sh
@@ -0,0 +1,136 @@
+#!/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