jp (base): added msg and exit_code argument to errback so it's more generic

frontends/src/jp/base.py

@@ -759,14 +759,19 @@ class CommandBase(object):
             raise exceptions.InternalError(_(u'trying to use output when use_output has not been set'))
         return self.host.output(output_type, self.args.output, self.extra_outputs, data)
 
-    def errback(self, failure_):
+    def errback(self, failure_, msg=None, exit_code=C.EXIT_ERROR):
         """generic callback for errbacks
 
         display failure_ then quit with generic error
         @param failure_: arguments returned by errback
+        @param msg(unicode, None): message template
+            use {} if you want to display failure message
+        @param exit_code(int): shell exit code
         """
-        self.disp(u"error: {}".format(failure_), error=True)
-        self.host.quit(C.EXIT_ERROR)
+        if msg is None:
+            msg = _(u"error: {}")
+        self.disp(msg.format(failure_), error=True)
+        self.host.quit(exit_code)
 
     def add_parser_options(self):
         try: