From fe43539f705335319c49a70dfa81d758def5bc8a Mon Sep 17 00:00:00 2001
From: David Seifert <soap@gentoo.org>
Date: Sun, 24 Sep 2017 11:07:36 +0200
Subject: cmake-utils.eclass: Add QA check for broken buildsystems

Closes: https://github.com/gentoo/gentoo/pull/4757
---
 eclass/cmake-utils.eclass | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'eclass')

diff --git a/eclass/cmake-utils.eclass b/eclass/cmake-utils.eclass
index c6a52b8d9ae7..148fbc3cff33 100644
--- a/eclass/cmake-utils.eclass
+++ b/eclass/cmake-utils.eclass
@@ -93,6 +93,12 @@ _CMAKE_UTILS_ECLASS=1
 # for econf and is needed to pass TRY_RUN results when cross-compiling.
 # Should be set by user in a per-package basis in /etc/portage/package.env.
 
+# @ECLASS-VARIABLE: CMAKE_UTILS_QA_SRC_DIR_READONLY
+# @DESCRIPTION:
+# After running cmake-utils_src_prepare, sets ${S} to read-only. This is
+# a user flag and should under _no circumstances_ be set in the ebuild.
+# Helps in improving QA of build systems that write to source tree.
+
 case ${EAPI} in
 	5) : ${CMAKE_WARN_UNUSED_CLI:=no} ;;
 	6) : ${CMAKE_WARN_UNUSED_CLI:=yes} ;;
@@ -442,6 +448,11 @@ cmake-utils_src_prepare() {
 
 	popd > /dev/null || die
 
+	# make ${S} read-only in order to detect broken build-systems
+	if [[ ${CMAKE_UTILS_QA_SRC_DIR_READONLY} && ! ${CMAKE_IN_SOURCE_BUILD} ]]; then
+		chmod -R a-w "${S}"
+	fi
+
 	_CMAKE_UTILS_SRC_PREPARE_HAS_RUN=1
 }
 
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