From 22e734514855f5a2c8fd363569ca896c2dba8733 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 14 Jun 2013 17:37:38 -0700
Subject: [PATCH] packer: Ui requires input for Ctrl-C

---
 command/build/command.go |  1 -
 packer/ui.go             | 18 +++++++++++-------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/command/build/command.go b/command/build/command.go
index c568f6fb4..f83f856ff 100644
--- a/command/build/command.go
+++ b/command/build/command.go
@@ -210,7 +210,6 @@ func (c Command) Run(env packer.Environment, args []string) int {
 		}
 	}
 
-
 	// Wait for both the builds to complete and the interrupt handler,
 	// if it is interrupted.
 	log.Printf("Waiting on builds to complete...")
diff --git a/packer/ui.go b/packer/ui.go
index c996b48d1..b8d5c11a9 100644
--- a/packer/ui.go
+++ b/packer/ui.go
@@ -124,14 +124,18 @@ func (rw *ReaderWriterUi) Ask(query string) string {
 		result <- line
 	}()
 
-	select {
-	case line := <-result:
-		return line
-	case <-sigCh:
-		log.Println("Interrupt during Ask call. Returning immediately.")
-		fmt.Fprintln(rw.Writer)
-		return ""
+	for {
+		select {
+		case line := <-result:
+			return line
+		case <-sigCh:
+			fmt.Fprint(
+				rw.Writer,
+				"\nInterrupts are blocked while waiting for input. Press enter.")
+		}
 	}
+
+	return ""
 }
 
 func (rw *ReaderWriterUi) Say(message string) {