linux-kernel - Re: [PATCH v2] selftests/kselftest/runner/run_one(): Allow running non-executable files

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Date:   Mon, 13 Sep 2021 11:24:42 +0000
From:   SeongJae Park <sj38.park@...il.com>
To:     SeongJae Park <sj38.park@...il.com>
Cc:     shuah@...nel.org, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, SeongJae Park <sjpark@...zon.de>
Subject: Re: [PATCH v2] selftests/kselftest/runner/run_one(): Allow running non-executable files

From: SeongJae Park <sjpark@...zon.de>

Hello Shuah,


Could you I ask your comment for this patch?


Thanks,
SJ

On Tue, 10 Aug 2021 16:45:34 +0000 SeongJae Park <sj38.park@...il.com> wrote:

> From: SeongJae Park <sjpark@...zon.de>
> 
> When running a test program, 'run_one()' checks if the program has the
> execution permission and fails if it doesn't.  However, it's easy to
> mistakenly missing the permission, as some common tools like 'diff'
> don't support the permission change well[1].  Compared to that, making
> mistakes in the test program's path would only rare, as those are
> explicitly listed in 'TEST_PROGS'.  Therefore, it might make more sense
> to resolve the situation on our own and run the program.
> 
> For the reason, this commit makes the test program runner function to
> still print the warning message but try parsing the interpreter of the
> program and explicitly run it with the interpreter, in the case.
> 
> [1] https://lore.kernel.org/mm-commits/YRJisBs9AunccCD4@kroah.com/
> 
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: SeongJae Park <sjpark@...zon.de>
> ---
> Changes from v1
> (https://lore.kernel.org/linux-kselftest/20210810140459.23990-1-sj38.park@gmail.com/)
> - Parse and use the interpreter instead of changing the file
> 
>  tools/testing/selftests/kselftest/runner.sh | 28 +++++++++++++--------
>  1 file changed, 18 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
> index cc9c846585f0..a9ba782d8ca0 100644
> --- a/tools/testing/selftests/kselftest/runner.sh
> +++ b/tools/testing/selftests/kselftest/runner.sh
> @@ -33,9 +33,9 @@ tap_timeout()
>  {
>  	# Make sure tests will time out if utility is available.
>  	if [ -x /usr/bin/timeout ] ; then
> -		/usr/bin/timeout --foreground "$kselftest_timeout" "$1"
> +		/usr/bin/timeout --foreground "$kselftest_timeout" $1
>  	else
> -		"$1"
> +		$1
>  	fi
>  }
>  
> @@ -65,17 +65,25 @@ run_one()
>  
>  	TEST_HDR_MSG="selftests: $DIR: $BASENAME_TEST"
>  	echo "# $TEST_HDR_MSG"
> -	if [ ! -x "$TEST" ]; then
> -		echo -n "# Warning: file $TEST is "
> -		if [ ! -e "$TEST" ]; then
> -			echo "missing!"
> -		else
> -			echo "not executable, correct this."
> -		fi
> +	if [ ! -e "$TEST" ]; then
> +		echo "# Warning: file $TEST is missing!"
>  		echo "not ok $test_num $TEST_HDR_MSG"
>  	else
> +		cmd="./$BASENAME_TEST"
> +		if [ ! -x "$TEST" ]; then
> +			echo "# Warning: file $TEST is not executable"
> +
> +			if [ $(head -n 1 "$TEST" | cut -c -2) = "#!" ]
> +			then
> +				interpreter=$(head -n 1 "$TEST" | cut -c 3-)
> +				cmd="$interpreter ./$BASENAME_TEST"
> +			else
> +				echo "not ok $test_num $TEST_HDR_MSG"
> +				return
> +			fi
> +		fi
>  		cd `dirname $TEST` > /dev/null
> -		((((( tap_timeout ./$BASENAME_TEST 2>&1; echo $? >&3) |
> +		((((( tap_timeout "$cmd" 2>&1; echo $? >&3) |
>  			tap_prefix >&4) 3>&1) |
>  			(read xs; exit $xs)) 4>>"$logfile" &&
>  		echo "ok $test_num $TEST_HDR_MSG") ||
> -- 
> 2.17.1
>