improved error handling

lib/forever.js

@@ -130,7 +130,7 @@ function getAllProcesses(callback) {
     }
 
     async.map(sockets, getProcess, function (err, processes) {
-      callback(processes.filter(Boolean));
+      callback(err, processes.filter(Boolean));
     });
   });
 }
@@ -516,8 +516,8 @@ forever.stopAll = function (format) {
 // Returns the list of all process data managed by forever.
 //
 forever.list = function (format, callback) {
-  getAllProcesses(function (processes) {
-    callback(null, forever.format(format, processes));
+  getAllProcesses(function (err, processes) {
+    callback(err, forever.format(format, processes));
   });
 };
 
@@ -592,8 +592,11 @@ forever.tail = function (target, options, callback) {
     });
   }
 
-  getAllProcesses(function (processes) {
-    if (!processes) {
+  getAllProcesses(function (err, processes) {
+    if (err) {
+      return callback(err);
+    }
+    else if (!processes) {
       return callback(new Error('Cannot find forever process: ' + target));
     }
 
@@ -727,8 +730,12 @@ forever.cleanUp = function (cleanLogs, allowManager) {
   var emitter = new events.EventEmitter(),
       pidPath = forever.config.get('pidPath');
 
-  getAllProcesses(function (processes) {
-    if (cleanLogs) {
+  getAllProcesses(function (err, processes) {
+    if (err) {
+      emitter.emit('error', err);
+      return;
+    }
+    else if (cleanLogs) {
       forever.cleanLogsSync(processes);
     }