From 009d0f9d81bbd5e130520986ce84e8f097d88a52 Mon Sep 17 00:00:00 2001
From: Alexander Larsson <alexl@redhat.com>
Date: Thu, 19 Sep 2013 14:59:27 +0200
Subject: [PATCH] Image: unmount device before removing it on failures

If we don't do this the remove will fail due to EBUSY
---
 image.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/image.go b/image.go
index b3e8de3e55..16abf9eef0 100644
--- a/image.go
+++ b/image.go
@@ -414,6 +414,7 @@ func (image *Image) ensureImageDevice(devices DeviceSet) error {
 
 	err = ioutil.WriteFile(path.Join(mountDir, ".docker-id"), []byte(image.ID), 0600)
 	if err != nil {
+		_ = devices.UnmountDevice(image.ID, mountDir)
 		_ = devices.RemoveDevice(image.ID)
 		return err
 	}
@@ -432,11 +433,13 @@ func (image *Image) ensureImageDevice(devices DeviceSet) error {
 	// part of the container changes
 	dockerinitLayer, err := image.getDockerInitLayer()
 	if err != nil {
+		_ = devices.UnmountDevice(image.ID, mountDir)
 		_ = devices.RemoveDevice(image.ID)
 		return err
 	}
 	err = image.applyLayer(dockerinitLayer, mountDir)
 	if err != nil {
+		_ = devices.UnmountDevice(image.ID, mountDir)
 		_ = devices.RemoveDevice(image.ID)
 		return err
 	}