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

[SeongJae Park <sj38.park@gmail.com>]

From: SeongJae Park <sjpark@amazon.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 run the program after giving the
execution permission in the case.  To make nothing corrupted, it also
restores the permission after running it.

[1] https://lore.kernel.org/mm-commits/YRJisBs9AunccCD4@kroah.com/

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
 tools/testing/selftests/kselftest/runner.sh | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
index cc9c846585f0..2eb31e945709 100644
--- a/tools/testing/selftests/kselftest/runner.sh
+++ b/tools/testing/selftests/kselftest/runner.sh
@@ -65,15 +65,16 @@ 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 $TEST_HDR_MSG"
 	else
+		permission_added="false"
+		if [ ! -x "$TEST" ]; then
+			echo "# Warning: file $TEST is not executable"
+			chmod u+x "$TEST"
+			permission_added="true"
+		fi
 		cd `dirname $TEST` > /dev/null
 		((((( tap_timeout ./$BASENAME_TEST 2>&1; echo $? >&3) |
 			tap_prefix >&4) 3>&1) |
@@ -88,6 +89,9 @@ run_one()
 		else
 			echo "not ok $test_num $TEST_HDR_MSG # exit=$rc"
 		fi)
+		if [ "$permission_added" = "true" ]; then
+			chmod u-x "$TEST"
+		fi
 		cd - >/dev/null
 	fi
 }
-- 
2.17.1