pass Lambda source file as a variable

lambda.tf

@@ -1,10 +1,10 @@
 resource "aws_lambda_function" "lambda" {
-  filename                       = local.lambda_src
+  filename                       = var.source_file
   function_name                  = local.app_name
   description                    = "Creates an EC2 instance and executes Ansible playbooks"
   role                           = aws_iam_role.role.arn
   handler                        = local.lambda_handler
-  source_code_hash               = filesha256(local.lambda_src)
+  source_code_hash               = filesha256(var.source_file)
   kms_key_arn                    = aws_kms_key.kms.arn
   reserved_concurrent_executions = 1
   runtime                        = "go1.x"
@@ -38,4 +38,4 @@ resource "aws_lambda_permission" "cloudwatch_invoke" {
   function_name = aws_lambda_function.lambda.function_name
   principal     = "events.amazonaws.com"
   source_arn    = aws_cloudwatch_event_rule.schedule.arn
-}
+}

main.tf

@@ -4,6 +4,5 @@ data "aws_caller_identity" "current" {}
 locals {
   app_name       = "${var.project}-${var.appenv}-ansible-lambda"
   account_id     = data.aws_caller_identity.current.account_id
-  lambda_src     = "release/grace-ansible-lambda.zip"
   lambda_handler = "grace-ansible-lambda"
-}
+}

variables.tf

@@ -46,10 +46,16 @@ variable "schedule_expression" {
   default     = "rate(60 minutes)"
 }
 
+variable "source_file" {
+  type        = string
+  description = "(optional) full or relative path to zipped binary of lambda handler"
+  default     = "../release/grace-ansible-lambda.zip"
+}
+
 # TODO: uncomment when aws_iam_policy_document.kms supports dynamic updates
-# 
+#
 # variable "config_role_arn" {
 #     type = string
 #     description = "(optional) The Role Arn used by the AWS Config service"
 #     value = ""
-# }
+# }