ktest: Honor empty per-test option overrides

A per-test override can clear an inherited default option by assigning an
empty value, but __set_test_option() still used option_defined() to decide
whether a per-test key existed. That turned an empty per-test assignment
back into "fall back to the default", so tests still could not clear
inherited settings.

For example:

  DEFAULTS
  (...)
  LOG_FILE = /tmp/ktest-empty-override.log
  CLEAR_LOG = 1
  ADD_CONFIG = /tmp/.config

  TEST_START
  TEST_TYPE = build
  BUILD_TYPE = nobuild
  ADD_CONFIG =

This would run the test with ADD_CONFIG[1] = /tmp/.config

Fix by checking whether the per-test key exists before falling back. If it
does exist but is empty, treat it as unset for that test and stop the
fallback chain there.

Cc: John Hawley <warthog9@eaglescrag.net>
Cc: Andrea Righi <arighi@nvidia.com>
Cc: Marcos Paulo de Souza <mpdesouza@suse.com>
Cc: Matthieu Baerts <matttbe@kernel.org>
Cc: Fernando Fernandez Mancera <fmancera@suse.de>
Cc: Pedro Falcato <pfalcato@suse.de>
Link: https://patch.msgid.link/20260307-ktest-fixes-v1-4-565d412f4925@suse.com
Fixes: 22c37a9 ("ktest: Allow tests to undefine default options")
Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Author: rbmarliere

tools/testing/ktest/ktest.pl

@@ -4191,15 +4191,17 @@ sub __set_test_option {
 
     my $option = "$name\[$i\]";
 
-    if (option_defined($option)) {
+    if (exists($opt{$option})) {
+	return undef if (!option_defined($option));
 	return $opt{$option};
     }
 
     foreach my $test (keys %repeat_tests) {
 	if ($i >= $test &&
 	    $i < $test + $repeat_tests{$test}) {
 	    $option = "$name\[$test\]";
-	    if (option_defined($option)) {
+	    if (exists($opt{$option})) {
+		return undef if (!option_defined($option));
 		return $opt{$option};
 	    }
 	}