__ktap_test() may be called without the optional third argument which is
an issue for scripts using `set -u` to detect uninitialized variables
and potential bugs.

Fix this optional "directive" argument by either using the third
argument or an empty string.

This was discovered while developing tests for script control execution:
https://lore.kernel.org/r/20241112191858.162021-7-mic@digikod.net

Cc: Kees Cook <kees@kernel.org>
Cc: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
---
 tools/testing/selftests/kselftest/ktap_helpers.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest/ktap_helpers.sh b/tools/testing/selftests/kselftest/ktap_helpers.sh
index 79a125eb24c2..14e7f3ec3f84 100644
--- a/tools/testing/selftests/kselftest/ktap_helpers.sh
+++ b/tools/testing/selftests/kselftest/ktap_helpers.sh
@@ -40,7 +40,7 @@ ktap_skip_all() {
 __ktap_test() {
 	result="$1"
 	description="$2"
-	directive="$3" # optional
+	directive="${3:-}" # optional
 
 	local directive_str=
 	[ ! -z "$directive" ] && directive_str="# $directive"
-- 
2.47.1

On Wed, Nov 27, 2024 at 05:03:40PM +0100, Mickaël Salaün wrote:
> __ktap_test() may be called without the optional third argument which is
> an issue for scripts using `set -u` to detect uninitialized variables
> and potential bugs.
> 
> Fix this optional "directive" argument by either using the third
> argument or an empty string.
> 
> This was discovered while developing tests for script control execution:
> https://lore.kernel.org/r/20241112191858.162021-7-mic@digikod.net
> 
> Cc: Kees Cook <kees@kernel.org>
> Cc: Nícolas F. R. A. Prado <nfraprado@collabora.com>
> Cc: Shuah Khan <skhan@linuxfoundation.org>

Please add this missing tag:

Fixes: 14571ab1ad21 ("kselftest: Add new test for detecting unprobed Devicetree devices")

> Signed-off-by: Mickaël Salaün <mic@digikod.net>
> ---
>  tools/testing/selftests/kselftest/ktap_helpers.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kselftest/ktap_helpers.sh b/tools/testing/selftests/kselftest/ktap_helpers.sh
> index 79a125eb24c2..14e7f3ec3f84 100644
> --- a/tools/testing/selftests/kselftest/ktap_helpers.sh
> +++ b/tools/testing/selftests/kselftest/ktap_helpers.sh
> @@ -40,7 +40,7 @@ ktap_skip_all() {
>  __ktap_test() {
>  	result="$1"
>  	description="$2"
> -	directive="$3" # optional
> +	directive="${3:-}" # optional
>  
>  	local directive_str=
>  	[ ! -z "$directive" ] && directive_str="# $directive"
> -- 
> 2.47.1
> 
>