Re: [PATCH libgpiod 2/4] tools: tests: use $@ instead of $*

[Kent Gibson <warthog618@gmail.com>]

On Fri, May 24, 2024 at 08:03:28PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
>
> $@ does not break up quoted arguments which is what we want in all cases
> in the bash test-suite. Use it instead of $*.
>

I believe it needs to be "$@".  Everywhere.

Where do we use quoted arguments/whitespaced parameters?
So this is purely about "good" shell?  In that case why stop here - e.g.
shellcheck picks up a load more "Double quote to prevent splitting/globbing"
and the like.

> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> ---
>  tools/gpio-tools-test.bash | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/tools/gpio-tools-test.bash b/tools/gpio-tools-test.bash
> index abb2f5d..8b4f054 100755
> --- a/tools/gpio-tools-test.bash
> +++ b/tools/gpio-tools-test.bash
> @@ -27,10 +27,10 @@ GPIOSIM_APP_NAME="gpio-tools-test"
>  MIN_KERNEL_VERSION="5.17.4"
>  MIN_SHUNIT_VERSION="2.1.8"
>
> -# Run the command in $* and fail the test if the command succeeds.
> +# Run the command in $@ and fail the test if the command succeeds.
>  assert_fail() {
> -	$* || return 0
> -	fail " '$*': command did not fail as expected"
> +	$@ || return 0
> +	fail " '$@': command did not fail as expected"
>  }
>
>  # Check if the string in $2 matches against the pattern in $1.
> @@ -71,7 +71,7 @@ gpiosim_chip() {
>
>  	mkdir -p $BANKPATH
>
> -	for ARG in $*
> +	for ARG in $@
>  	do
>  		local KEY=$(echo $ARG | cut -d"=" -f1)
>  		local VAL=$(echo $ARG | cut -d"=" -f2)
> @@ -253,7 +253,7 @@ dut_regex_match() {
>  }
>
>  dut_write() {
> -	echo $* >&${COPROC[1]}
> +	echo $@ >&${COPROC[1]}
>  }
>

Does echo care?  I realise a linter, and that includes Andy, will complain
here, but is there a practical difference?

Cheers,
Kent.

>  dut_kill() {
> @@ -283,7 +283,7 @@ tearDown() {
>  }
>
>  request_release_line() {
> -	$SOURCE_DIR/gpioget -c $* >/dev/null
> +	$SOURCE_DIR/gpioget -c $@ >/dev/null
>  }
>
>  #
>
> --
> 2.43.0
>