providers/aws: retry destroying internet gateway for some time [GH-447]

CHANGELOG.md

@@ -14,6 +14,9 @@ BUG FIXES:
       the correct data and don't incorrectly recreate themselves. [GH-425]
   * providers/aws: Fix case where ELB would incorrectly plan to modify
       listeners (with the same data) in some cases.
+  * providers/aws: Retry destroying internet gateway for some amount of time
+      if there is a dependency violation since it is probably just eventual
+      consistency (public facing resources being destroyed). [GH-447]
   * providers/aws: Retry deleting security groups for some amount of time
       if there is a dependency violation since it is probably just eventual
       consistency. [GH-436]

builtin/providers/aws/resource_aws_internet_gateway.go

@@ -81,14 +81,26 @@ func resource_aws_internet_gateway_destroy(
 	}
 
 	log.Printf("[INFO] Deleting Internet Gateway: %s", s.ID)
-	if _, err := ec2conn.DeleteInternetGateway(s.ID); err != nil {
-		ec2err, ok := err.(*ec2.Error)
-		if ok && ec2err.Code == "InvalidInternetGatewayID.NotFound" {
-			return nil
+	return resource.Retry(5*time.Minute, func() error {
+		_, err := ec2conn.DeleteInternetGateway(s.ID)
+		if err != nil {
+			ec2err, ok := err.(*ec2.Error)
+			if !ok {
+				return err
+			}
+
+			switch ec2err.Code {
+			case "InvalidInternetGatewayID.NotFound":
+				return nil
+			case "DependencyViolation":
+				return err // retry
+			default:
+				return resource.RetryError{err}
+			}
 		}
 
 		return fmt.Errorf("Error deleting internet gateway: %s", err)
-	}
+	})
 
 	// Wait for the internet gateway to actually delete
 	log.Printf("[DEBUG] Waiting for internet gateway (%s) to delete", s.ID)