path: root/scripts
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authorMasahiro Yamada <>2019-10-01 21:17:24 +0900
committerMasahiro Yamada <>2019-10-05 15:29:49 +0900
commit7a82e3fa28f174ba23c9faca544c65986e3025f1 (patch)
treec73d7078a036f7c1e26e679e33d18126307b84d6 /scripts
parent82fdd12b95727640c9a8233c09d602e4518e71f7 (diff)
scripts/setlocalversion: clear local variable to make it work for sh
Geert Uytterhoeven reports a strange side-effect of commit 858805b336be ("kbuild: add $(BASH) to run scripts with bash-extension"), which inserts the contents of a localversion file in the build directory twice. [Steps to Reproduce] $ echo bar > localversion $ mkdir build $ cd build/ $ echo foo > localversion $ make -s -f ../Makefile defconfig include/config/kernel.release $ cat include/config/kernel.release 5.4.0-rc1foofoobar This comes down to the behavior change of local variables. The 'man sh' on my Ubuntu machine, where sh is an alias to dash, explains as follows: When a variable is made local, it inherits the initial value and exported and readonly flags from the variable with the same name in the surrounding scope, if there is one. Otherwise, the variable is initially unset. [Test Code] foo () { local res echo "res: $res" } res=1 foo [Result] $ sh res: 1 $ bash res: So, scripts/setlocalversion correctly works only for bash in spite of its hashbang being #!/bin/sh. Nobody had noticed it before because CONFIG_SHELL was previously set to bash almost all the time. Now that CONFIG_SHELL is set to sh, we must write portable and correct code. I gave the Fixes tag to the commit that uncovered the issue. Clear the variable 'res' in collect_files() to make it work for sh (and it also works on distributions where sh is an alias to bash). Fixes: 858805b336be ("kbuild: add $(BASH) to run scripts with bash-extension") Reported-by: Geert Uytterhoeven <> Signed-off-by: Masahiro Yamada <> Tested-by: Geert Uytterhoeven <>
Diffstat (limited to 'scripts')
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index 365b3c2b8f43..220dae0db3f1 100755
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -126,7 +126,7 @@ scm_version()
- local file res
+ local file res=
for file; do
case "$file" in