kbuild: do not overwrite .gitignore in output directory

masahir0y · masahir0y · commit 156e7cbb3ef5 · 2019-03-28T23:46:55.000+09:00
Commit 3a51ff3 ("kbuild: gitignore output directory") seemed to bother people who version-control output directories. Andre Przywara says: "Unfortunately this breaks my setup, because I keep a totally separate git repository in my build directories to track (various versions of) .config. So .gitignore there is carefully crafted to ignore most build artefacts, but not .config, for instance." Link: https://lkml.org/lkml/2019/3/22/1819 Reported-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Tested-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/Makefile b/Makefile
@@ -499,7 +499,8 @@ outputmakefile:
 ifneq ($(KBUILD_SRC),)
 	$(Q)ln -fsn $(srctree) source
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
-	$(Q){ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
+	$(Q)test -e .gitignore || \
+	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 endif
 
 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
