ktest: Run POST_KTEST hooks on failure and cancellation

PRE_KTEST can be useful for setting up the environment and POST_KTEST to
tear it down, however POST_KTEST only runs on the normal end-of-run path.
It is skipped when ktest exits through dodie() or cancel_test(). Final
cleanup hooks are skipped.

Factor the final hook execution into run_post_ktest(), call it from the
normal exit path and from the early exit paths, and guard it so the hook
runs at most once.

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-v1-8-565d412f4925@suse.com
Fixes: 921ed4c ("ktest: Add PRE/POST_KTEST and TEST 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

@@ -100,6 +100,7 @@
 my $build_type;
 my $build_options;
 my $final_post_ktest;
+my $post_ktest_done = 0;
 my $pre_ktest;
 my $pre_ktest_die;
 my $post_ktest;
@@ -1586,6 +1587,24 @@ ()
     return $name;
 }
 
+sub run_post_ktest {
+    my $cmd;
+
+    return if ($post_ktest_done);
+
+    if (defined($final_post_ktest)) {
+	$cmd = $final_post_ktest;
+    } elsif (defined($post_ktest)) {
+	$cmd = $post_ktest;
+    } else {
+	return;
+    }
+
+    my $cp_post_ktest = eval_kernel_version($cmd);
+    run_command $cp_post_ktest;
+    $post_ktest_done = 1;
+}
+
 sub dodie {
     # avoid recursion
     return if ($in_die);
@@ -1645,6 +1664,7 @@ sub dodie {
     if (defined($post_test)) {
 	run_command $post_test;
     }
+    run_post_ktest;
 
     die @_, "\n";
 }
@@ -4314,6 +4334,7 @@ sub cancel_test {
 	send_email("KTEST: Your [$name] test was cancelled",
 	    "Your test started at $script_start_time was cancelled: sig int");
     }
+    run_post_ktest;
     die "\nCaught Sig Int, test interrupted: $!\n"
 }
 
@@ -4679,11 +4700,7 @@ sub die_usage {
     success $i;
 }
 
-if (defined($final_post_ktest)) {
-
-    my $cp_final_post_ktest = eval_kernel_version $final_post_ktest;
-    run_command $cp_final_post_ktest;
-}
+run_post_ktest;
 
 if ($opt{"POWEROFF_ON_SUCCESS"}) {
     halt;