users() optimized results if lack of permissions

lib/users.js

@@ -31,7 +31,7 @@ const opts = {
 // --------------------------
 // array of users online = sessions
 
-function parseUsersLinux(lines) {
+function parseUsersLinux(lines, phase) {
   let result = [];
   let result_who = [];
   let result_w = {};
@@ -88,7 +88,11 @@ function parseUsersLinux(lines) {
       }
     }
   });
-  return result;
+  if (result.length === 0 && phase === 2) {
+    return result_who;
+  } else {
+    return result;
+  }
 }
 
 function parseUsersDarwin(lines) {
@@ -189,13 +193,13 @@ function users(callback) {
           if (!error) {
             // lines / split
             let lines = stdout.toString().split('\n');
-            result = parseUsersLinux(lines);
+            result = parseUsersLinux(lines, 1);
             if (result.length === 0) {
               exec('who; echo "---"; w | tail -n +2', function (error, stdout) {
                 if (!error) {
                   // lines / split
                   lines = stdout.toString().split('\n');
-                  result = parseUsersLinux(lines);
+                  result = parseUsersLinux(lines, 2);
                 }
                 if (callback) { callback(result); }
                 resolve(result);