Add final_snapshot_identifier argument (#7)

Author: drama17

main.tf

@@ -8,6 +8,16 @@ module "label" {
   tags       = "${var.tags}"
 }
 
+module "final_snapshot_label" {
+  source     = "git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.2.1"
+  namespace  = "${var.namespace}"
+  name       = "${var.name}"
+  stage      = "${var.stage}"
+  delimiter  = "${var.delimiter}"
+  attributes = ["${compact(concat(var.attributes, list("final", "snapshot", "${md5(timestamp())}")))}"]
+}
+
+
 resource "aws_db_instance" "default" {
   identifier                  = "${module.label.id}"
   name                        = "${var.database_name}"
@@ -35,7 +45,7 @@ resource "aws_db_instance" "default" {
   backup_retention_period     = "${var.backup_retention_period}"
   backup_window               = "${var.backup_window}"
   tags                        = "${module.label.tags}"
-  final_snapshot_identifier   = "${var.final_snapshot_identifier}"
+  final_snapshot_identifier   = "${length(var.final_snapshot_identifier) > 0 ? var.final_snapshot_identifier : module.final_snapshot_label.id}"
 }
 
 resource "aws_db_parameter_group" "default" {

variables.tf

@@ -160,5 +160,7 @@ variable "snapshot_identifier" {
 }
 
 variable "final_snapshot_identifier" {
+  description = "Identifier e.g.: some-db-final-snapshot-2015-06-26-06-05"
+  type = "string"
   default = ""
 }