shell: merge some options

src/shell.js

@@ -113,9 +113,9 @@ function sudo(tag, args, options, callback) {
 
     callback = once(callback); // exit may or may not be called after an 'error'
 
-    const logFunc = options.outputHasTimestamps ? process.stdout.write : debug;
+    const logFunc = options.logger || debug;
 
-    if (options.ipc) {
+    if (options.onMessage) { // enable ipc
         sudoArgs.push('--close-from=4'); // keep the ipc open. requires closefrom_override in sudoers file
         options.stdio = ['pipe', 'pipe', 'pipe', 'ipc'];
     }