From dfe0efaf175653b7ea34a6776a9b882e055f060b Mon Sep 17 00:00:00 2001
From: Christopher Tiwald <ctiwald@conductor.com>
Date: Thu, 16 Jul 2015 01:37:21 -0400
Subject: [PATCH] aws_db_instance: Only write lowercase engines to the state
 file.

Amazon accepts mixed-case engines, but only returns lowercase. Without
the proper StateFunc, every apply of a mixed-case engine will result in
a new db instance. Standardize on lowercase.
---
 builtin/providers/aws/resource_aws_db_instance.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/builtin/providers/aws/resource_aws_db_instance.go b/builtin/providers/aws/resource_aws_db_instance.go
index 47a98b73d3..6ca1916b51 100644
--- a/builtin/providers/aws/resource_aws_db_instance.go
+++ b/builtin/providers/aws/resource_aws_db_instance.go
@@ -46,6 +46,10 @@ func resourceAwsDbInstance() *schema.Resource {
 				Type:     schema.TypeString,
 				Required: true,
 				ForceNew: true,
+				StateFunc: func(v interface{}) string {
+					value := v.(string)
+					return strings.ToLower(value)
+				},
 			},
 
 			"engine_version": &schema.Schema{