From 443ccc53061c5429d8024f7d2648adc83ac63261 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 23 Aug 2013 14:39:59 -0700
Subject: [PATCH] packer/rpc: don't panic on failed Ui calls

---
 communicator/ssh/communicator.go | 2 +-
 packer/rpc/ui.go                 | 9 +++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/communicator/ssh/communicator.go b/communicator/ssh/communicator.go
index 6a10d2299..c59b91892 100644
--- a/communicator/ssh/communicator.go
+++ b/communicator/ssh/communicator.go
@@ -160,7 +160,7 @@ func (c *comm) Upload(path string, input io.Reader) error {
 		return err
 	}
 
-	if _, err := io.Copy(w, input_memory); err != nil{
+	if _, err := io.Copy(w, input_memory); err != nil {
 		return err
 	}
 
diff --git a/packer/rpc/ui.go b/packer/rpc/ui.go
index 617541dde..4d7ccc57f 100644
--- a/packer/rpc/ui.go
+++ b/packer/rpc/ui.go
@@ -2,6 +2,7 @@ package rpc
 
 import (
 	"github.com/mitchellh/packer/packer"
+	"log"
 	"net/rpc"
 )
 
@@ -30,7 +31,7 @@ func (u *Ui) Ask(query string) (result string, err error) {
 
 func (u *Ui) Error(message string) {
 	if err := u.client.Call("Ui.Error", message, new(interface{})); err != nil {
-		panic(err)
+		log.Printf("Error in Ui RPC call: %s", err)
 	}
 }
 
@@ -41,19 +42,19 @@ func (u *Ui) Machine(t string, args ...string) {
 	}
 
 	if err := u.client.Call("Ui.Machine", rpcArgs, new(interface{})); err != nil {
-		panic(err)
+		log.Printf("Error in Ui RPC call: %s", err)
 	}
 }
 
 func (u *Ui) Message(message string) {
 	if err := u.client.Call("Ui.Message", message, new(interface{})); err != nil {
-		panic(err)
+		log.Printf("Error in Ui RPC call: %s", err)
 	}
 }
 
 func (u *Ui) Say(message string) {
 	if err := u.client.Call("Ui.Say", message, new(interface{})); err != nil {
-		panic(err)
+		log.Printf("Error in Ui RPC call: %s", err)
 	}
 }