From dfb77274cef85c0561d98de2eee8b2562c329d1f Mon Sep 17 00:00:00 2001
From: Solomon Hykes <solomon@dotcloud.com>
Date: Fri, 18 Oct 2013 08:22:42 +0000
Subject: [PATCH] devmapper: clearer make the 'unknown base hash' error message
 more understandable

---
 devmapper/deviceset.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/devmapper/deviceset.go b/devmapper/deviceset.go
index e08d4629f6..75ead65ec7 100644
--- a/devmapper/deviceset.go
+++ b/devmapper/deviceset.go
@@ -449,8 +449,7 @@ func (devices *DeviceSet) AddDevice(hash, baseHash string) error {
 
 	baseInfo := devices.Devices[baseHash]
 	if baseInfo == nil {
-		utils.Debugf("Base Hash not found")
-		return fmt.Errorf("Unknown base hash %s", baseHash)
+		return fmt.Errorf("Error adding device for '%s': can't find device for parent '%s'", hash, baseHash)
 	}
 
 	deviceId := devices.allocateDeviceId()