Improve internal error when the compare script errors.

This will include the exit code in the description of the internal error
in order to make it more clear, as well as include the metadata.

Author: meisterT

judge/judgedaemon.main.php

@@ -1467,13 +1467,19 @@ function judge(array $judgeTask): bool
         }
 
         if ($result === 'compare-error') {
+            $compareMeta = read_metadata($passdir . '/compare.meta');
+            $compareExitCode = 'n/a';
+            if (isset($compareMeta['exitcode'])) {
+                $compareExitCode = $compareMeta['exitcode'];
+            }
             if ($combined_run_compare) {
                 logmsg(LOG_ERR, "comparing failed for combined run/compare script '" . $judgeTask['run_script_id'] . "'");
-                $description = 'combined run/compare script ' . $judgeTask['run_script_id'] . ' crashed';
+                $description = 'combined run/compare script ' . $judgeTask['run_script_id'] . ' crashed with exit code ' . $compareExitCode . ", expected one of 42/43";
                 disable('run_script', 'run_script_id', $judgeTask['run_script_id'], $description, $judgeTask['judgetaskid']);
             } else {
                 logmsg(LOG_ERR, "comparing failed for compare script '" . $judgeTask['compare_script_id'] . "'");
-                $description = 'compare script ' . $judgeTask['compare_script_id'] . ' crashed';
+                logmsg(LOG_ERR, "compare script meta data:\n" . dj_file_get_contents($passdir . '/compare.meta'));
+                $description = 'compare script ' . $judgeTask['compare_script_id'] . ' crashed with exit code ' . $compareExitCode . ", expected one of 42/43";
                 disable('compare_script', 'compare_script_id', $judgeTask['compare_script_id'], $description, $judgeTask['judgetaskid']);
             }
             return false;