scripts/tags.sh: fix direct execution of scripts/tags.sh
I thought this script was run via "make tags" etc. but some people
run it directly.
Prior to commit a9a49c2ad9b9 ("kbuild: use $(srctree) instead of
KBUILD_SRC to check out-of-tree build"), in such a usecase, "tree"
was set empty since KBUILD_SRC is undefined. Now, "tree" is set to
"${srctree}/", which is evaluated to "/".
Fix it by taking into account the case where "srctree" is unset.
Link: https://lkml.org/lkml/2019/4/19/501
Fixes: a9a49c2ad9b9 ("kbuild: use $(srctree) instead of KBUILD_SRC to check out-of-tree build")
Reported-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/tags.sh b/scripts/tags.sh
index 6a55180..70e14c6 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -19,7 +19,7 @@
# Do not use full path if we do not use O=.. builds
# Use make O=. {tags|cscope}
# to force full paths for a non-O= build
-if [ "${srctree}" = "." ]; then
+if [ "${srctree}" = "." -o -z "${srctree}" ]; then
tree=
else
tree=${srctree}/
