From c7e932ee6ea09fbeb8755c3ea34cd35b084a761d Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 23 Aug 2013 13:58:00 -0700
Subject: [PATCH] packer/rpc: error instead of panic cancelling builder

---
 packer/rpc/builder.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packer/rpc/builder.go b/packer/rpc/builder.go
index f508792b7..8c56e4959 100644
--- a/packer/rpc/builder.go
+++ b/packer/rpc/builder.go
@@ -105,7 +105,7 @@ func (b *builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 
 func (b *builder) Cancel() {
 	if err := b.client.Call("Builder.Cancel", new(interface{}), new(interface{})); err != nil {
-		panic(err)
+		log.Printf("Error cancelling builder: %s", err)
 	}
 }