From 2f98ab2018f57adb38d3fae905c7d2807c6a9880 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Thu, 27 Jun 2013 22:24:53 -0400
Subject: [PATCH] builder/virtualbox: return if cancelled, to avoid nil deref

---
 builder/virtualbox/builder.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/builder/virtualbox/builder.go b/builder/virtualbox/builder.go
index 4bbc04b1e..ea2e7de68 100644
--- a/builder/virtualbox/builder.go
+++ b/builder/virtualbox/builder.go
@@ -260,6 +260,15 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		return nil, rawErr.(error)
 	}
 
+	// If we were interrupted or cancelled, then just exit.
+	if _, ok := state[multistep.StateCancelled]; ok {
+		return nil, errors.New("Build was cancelled.")
+	}
+
+	if _, ok := state[multistep.StateHalted]; ok {
+		return nil, errors.New("Build was halted.")
+	}
+
 	// Compile the artifact list
 	files := make([]string, 0, 5)
 	visit := func(path string, info os.FileInfo, err error) error {