selftests: support interpreted scripts with ksft_runner.sh

Support testcases that are themselves not executable, but need an
interpreter to run them.

If a test file is not executable, but an executable file
ksft_runner.sh exists in the TARGET dir, kselftest will run

    ./ksft_runner.sh ./$BASENAME_TEST

Packetdrill may add hundreds of packetdrill scripts for testing. These
scripts must be passed to the packetdrill process.

Have kselftest run each test directly, as it already solves common
runner requirements like parallel execution and isolation (netns).
A previous RFC added a wrapper in between, which would have to
reimplement such functionality.

Link: https://lore.kernel.org/netdev/66d4d97a4cac_3df182941a@willemb.c.googlers.com.notmuch/T/
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20240905231653.2427327-2-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
index 74954f6..2c3c58e 100644 (file)
--- a/tools/testing/selftests/kselftest/runner.sh
+++ b/tools/testing/selftests/kselftest/runner.sh
@@ -111,8 +111,11 @@ run_one()
                        stdbuf="/usr/bin/stdbuf --output=L "
                fi
                eval kselftest_cmd_args="\$${kselftest_cmd_args_ref:-}"
-               cmd="$stdbuf ./$BASENAME_TEST $kselftest_cmd_args"
-               if [ ! -x "$TEST" ]; then
+               if [ -x "$TEST" ]; then
+                       cmd="$stdbuf ./$BASENAME_TEST $kselftest_cmd_args"
+               elif [ -x "./ksft_runner.sh" ]; then
+                       cmd="$stdbuf ./ksft_runner.sh ./$BASENAME_TEST"
+               else
                        echo "# Warning: file $TEST is not executable"
 
                        if [ $(head -n 1 "$TEST" | cut -c -2) = "#!" ]