Add default values to ENV vars and check if they are not empty (#10)

Author: aknysh

README.md

@@ -44,8 +44,8 @@ module "build" {
 | privileged_mode     | ""                           | (Optional) If set to true, enables running the Docker daemon inside a Docker container on the `CodeBuild` instance. Used when building Docker images |
 | aws_region          | ""                           | (Optional) AWS Region, _e.g._ `us-east-1`. Used as `CodeBuild` ENV variable when building Docker images                                              |
 | aws_account_id      | ""                           | (Optional) AWS Account ID. Used as `CodeBuild` ENV variable when building Docker images                                                              |
-| image_repo_name     | ""                           | (Optional) ECR repository name to store the Docker image built by this module. Used as `CodeBuild` ENV variable when building Docker images          |
-| image_tag           | ""                           | (Optional) Docker image tag in the ECR repository, _e.g._ `latest`. Used as `CodeBuild` ENV variable when building Docker images                     |
+| image_repo_name     | "UNSET"                      | (Optional) ECR repository name to store the Docker image built by this module. Used as `CodeBuild` ENV variable when building Docker images          |
+| image_tag           | "latest"                     | (Optional) Docker image tag in the ECR repository, _e.g._ `latest`. Used as `CodeBuild` ENV variable when building Docker images                     |
 
 
 

main.tf

@@ -6,7 +6,7 @@ data "aws_region" "default" {
 
 # Define composite variables for resources
 module "label" {
-  source    = "git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.2.1"
+  source     = "git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.2.1"
   namespace  = "${var.namespace}"
   name       = "${var.name}"
   stage      = "${var.stage}"
@@ -98,12 +98,12 @@ resource "aws_codebuild_project" "default" {
 
     environment_variable {
       "name"  = "IMAGE_REPO_NAME"
-      "value" = "${var.image_repo_name}"
+      "value" = "${signum(length(var.image_repo_name)) == 1 ? var.image_repo_name : "UNSET"}"
     }
 
     environment_variable {
       "name"  = "IMAGE_TAG"
-      "value" = "${var.image_tag}"
+      "value" = "${signum(length(var.image_tag)) == 1 ? var.image_tag : "latest"}"
     }
   }
 

variables.tf

@@ -58,12 +58,12 @@ variable "aws_account_id" {
 
 variable "image_repo_name" {
   type        = "string"
-  default     = ""
+  default     = "UNSET"
   description = "(Optional) ECR repository name to store the Docker image built by this module. Used as CodeBuild ENV variable when building Docker images. For more info: http://docs.aws.amazon.com/codebuild/latest/userguide/sample-docker.html"
 }
 
 variable "image_tag" {
   type        = "string"
-  default     = ""
+  default     = "latest"
   description = "(Optional) Docker image tag in the ECR repository, e.g. 'latest'. Used as CodeBuild ENV variable when building Docker images. For more info: http://docs.aws.amazon.com/codebuild/latest/userguide/sample-docker.html"
 }