[PATCH v2] selftests: Add version file to kselftest installation dir

[Tianyi Cui <1997cui@gmail.com>]

As titled, adding version file to kselftest installation dir, so the user
of the tarball can know which kernel version the tarball belongs to.

Signed-off-by: Tianyi Cui <1997cui@gmail.com>
---
 tools/testing/selftests/Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 339b31e6a6b5..9dae84a74e7f 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -293,6 +293,13 @@ ifdef INSTALL_PATH
 		$(MAKE) -s --no-print-directory OUTPUT=$$BUILD_TARGET COLLECTION=$$TARGET \
 			-C $$TARGET emit_tests >> $(TEST_LIST); \
 	done;
+	@VERSION=$$(git describe HEAD 2>/dev/null); \
+	if [ -n "$$VERSION" ]; then \
+		echo "$$VERSION" > $(INSTALL_PATH)/VERSION; \
+		printf "Version saved to $(INSTALL_PATH)/VERSION\n"; \
+	else \
+		printf "Unable to get version from git describe\n"; \
+	fi
 else
 	$(error Error: set INSTALL_PATH to use install)
 endif
-- 
2.47.1