Log non JSON API responses

plugin-root/usr/local/emhttp/plugins/u-navigator/api/common.php

@@ -32,6 +32,14 @@ function unav_read_only(): bool {
     return getenv('U_NAV_READ_ONLY') === '1';
 }
 
+function unav_function_available(string $name): bool {
+    if (!function_exists($name)) {
+        return false;
+    }
+    $disabled = array_map('trim', explode(',', (string)ini_get('disable_functions')));
+    return !in_array($name, $disabled, true);
+}
+
 function unav_json($payload, int $status = 200): void {
     http_response_code($status);
     header('Content-Type: application/json; charset=utf-8');

plugin-root/usr/local/emhttp/plugins/u-navigator/api/job.php

@@ -35,11 +35,22 @@ unav_job_write($job);
 
 $worker = __DIR__ . '/job_worker.php';
 $php = is_executable('/usr/bin/php') ? '/usr/bin/php' : (PHP_BINARY ?: 'php');
-if (function_exists('exec') && is_file($worker)) {
-    exec(escapeshellarg($php) . ' ' . escapeshellarg($worker) . ' ' . escapeshellarg($id) . ' > /dev/null 2>&1 &');
-} else {
-    require $worker;
+$started = false;
+
+if (unav_function_available('exec') && is_file($worker)) {
+    try {
+        $exitCode = 0;
+        @exec(escapeshellarg($php) . ' ' . escapeshellarg($worker) . ' ' . escapeshellarg($id) . ' > /dev/null 2>&1 &', $output, $exitCode);
+        $started = ($exitCode === 0);
+    } catch (Throwable $error) {
+        $started = false;
+    }
+}
+
+if (!$started) {
+    require_once $worker;
     unav_run_job($id);
+    $job = unav_job_read($id);
 }
 
 unav_json($job, 202);