1 files changed, 83 insertions, 0 deletions
diff --git a/util/build_allowed.sh b/util/build_allowed.sh
new file mode 100755
index 0000000000..9aa769a726
--- /dev/null
+++ b/util/build_allowed.sh
@@ -0,0 +1,83 @@
+#!/bin/bash
+#
+# Copyright 2021 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Taken from U-Boot and modified.
+
+# This grubby little script creates the list of allowed configurations. This
+# file contains all the config options which are allowed to be used outside
+# Kconfig. Please do not add things to the list. Instead, add your new option to
+# Kconfig.
+#
+# Usage:
+#   build_allowed.sh [-u]
+#
+#   -u : Update the existing allowed file
+
+export LC_ALL=C LC_COLLATE=C
+
+# Current list of allowed ad-hoc CONFIGs
+allowed=util/config_allowed.txt
+
+[ "$1" == "-u" ] && update=1
+
+tmp=$(mktemp -d)
+kconfigs="${tmp}/kconfigs"
+
+#
+# Look for the CONFIG options, excluding those in Kconfig and defconfig files.
+#
+git grep CONFIG_ | \
+	grep -E -vi "(Kconfig:|defconfig:|README|\.py|\.pl:)" \
+	| tr ' \t' '\n' \
+	| sed -n 's/^\(CONFIG_[A-Za-z0-9_]*\).*/\1/p' \
+	| sort | uniq >"${tmp}/allowed.tmp1";
+
+# We need a list of the valid Kconfig options to exclude these from the allowed
+# list.
+find . -type f -name "Kconfig*" -exec cat {} \; | sed -n -e \
+	's/^\s*\(config\|menuconfig\) *\([A-Za-z0-9_]*\)$/CONFIG_\2/p' \
+	| sort | uniq > "${kconfigs}"
+
+# Most Kconfigs follow the pattern of CONFIG_PLATFORM_EC_*.  Strip PLATFORM_EC_
+# from the config name to match the cros-ec namespace.
+sed -e 's/^CONFIG_PLATFORM_EC_/CONFIG_/p' "${kconfigs}" | sort | uniq \
+	> "${tmp}/allowed.tmp2"
+
+# Use only the options that are present in the first file but not the second.
+# These comprise new ad-hoc CONFIG options.
+comm -23 "${tmp}/allowed.tmp1" "${tmp}/allowed.tmp2" \
+	| sort | uniq >"${tmp}/allowed.tmp3"
+
+# If ${allowed} already exists, take the intersection of the current
+# list and the new one.  We do not want to increase the allowed options.
+if [ -r "${allowed}" ]; then
+	comm -12 "${tmp}/allowed.tmp3" "${allowed}" > "${tmp}/allowed.tmp4"
+
+	# Find any ad-hoc configs that now have Kconfig options
+	comm -13 "${tmp}/allowed.tmp4" "${allowed}" > "${tmp}/allowed.tmp5"
+	if [ -n "${update}" ]; then
+		echo >&2 "Removing these CONFIG options from the allowed list:"
+		comm -13 "${tmp}/allowed.tmp4" "${allowed}"
+		mv "${tmp}/allowed.tmp4" "${allowed}"
+	elif [ -s "${tmp}/allowed.tmp5" ]; then
+		echo >&2 "The following options are now in Kconfig:"
+		cat >&2 "${tmp}/allowed.tmp5"
+		echo >&2
+		echo >&2 "Please run this to update the list of allowed ad-hoc"
+		echo >&2 "CONFIGs and include this update in your CL:"
+		echo >&2
+		echo -e >&2 "\t./util/build_allowed.sh -u"
+		exit 1
+	fi
+else
+	# If there is no file yet, add one. This allows it to be regenerated
+	# from scratch if needed.
+	mv "${tmp}/allowed.tmp3" "${allowed}"
+fi
+
+rm -rf "${tmp}"
+
+unset LC_ALL LC_COLLATE