Create empty service env file

* When a new service is deployed, if the .env file doesn't exist in the
  environment files S3 bucket, the initial deployment will fail and
  terraform stops
* This adds a script to create an empty .env file for the service, only
  if the file doesn't exist (It won't overwrite existing files). The
  script is then ran when the bucklet or service name changes

README.md

@@ -28,6 +28,7 @@ This project creates and manages resources within an AWS account for infrastruct
 | <a name="provider_external"></a> [external](#provider\_external) | 2.3.3 |
 | <a name="provider_null"></a> [null](#provider\_null) | >= 3.2.2 |
 | <a name="provider_random"></a> [random](#provider\_random) | >= 3.6.0 |
+| <a name="provider_terraform"></a> [terraform](#provider\_terraform) | n/a |
 
 ## Resources
 
@@ -347,6 +348,7 @@ This project creates and manages resources within an AWS account for infrastruct
 | [null_resource.infrastructure_ecs_cluster_service_blue_green_create_codedeploy_deployment](https://registry.terraform.io/providers/hashicorp/null/latest/docs/resources/resource) | resource |
 | [random_password.infrastructure_ecs_cluster_service_cloudfront_bypass_protection_secret](https://registry.terraform.io/providers/hashicorp/random/latest/docs/resources/password) | resource |
 | [random_password.infrastructure_rds_root](https://registry.terraform.io/providers/hashicorp/random/latest/docs/resources/password) | resource |
+| [terraform_data.infrastructure_ecs_cluster_service_env_file](https://registry.terraform.io/providers/hashicorp/terraform/latest/docs/resources/data) | resource |
 | [archive_file.ecs_cluster_infrastructure_draining_lambda](https://registry.terraform.io/providers/hashicorp/archive/latest/docs/data-sources/file) | data source |
 | [archive_file.ecs_cluster_infrastructure_ecs_asg_diff_metric_lambda](https://registry.terraform.io/providers/hashicorp/archive/latest/docs/data-sources/file) | data source |
 | [archive_file.ecs_cluster_infrastructure_pending_task_metric_lambda](https://registry.terraform.io/providers/hashicorp/archive/latest/docs/data-sources/file) | data source |

ecs-cluster-infrastructure-service-codedeploy-blue-green.tf

@@ -173,5 +173,6 @@ resource "null_resource" "infrastructure_ecs_cluster_service_blue_green_create_c
 
 depends_on = [
   aws_codepipeline.infrastructure_ecs_cluster_service,
+  terraform_data.infrastructure_ecs_cluster_service_env_file,
 ]
 }

ecs-cluster-infrastructure-service.tf

@@ -151,6 +151,25 @@ resource "aws_iam_role_policy_attachment" "infrastructure_ecs_cluster_service_ta
   policy_arn = aws_iam_policy.infrastructure_ecs_cluster_service_task_custom[each.key].arn
 }
 
+
+resource "terraform_data" "infrastructure_ecs_cluster_service_env_file" {
+  for_each = local.infrastructure_ecs_cluster_services
+
+  triggers_replace = [
+    aws_ecs_service.infrastructure_ecs_cluster_service[each.key].name,
+    aws_s3_bucket.infrastructure_ecs_cluster_service_environment_files[0].bucket,
+  ]
+
+  provisioner "local-exec" {
+    interpreter = ["/bin/bash", "-c"]
+    command     = <<EOF
+      ${path.root}/local-exec-scripts/create-empty-s3-object.sh \
+      -b "${aws_s3_bucket.infrastructure_ecs_cluster_service_environment_files[0].bucket}" \
+      -k "${each.key}.env"
+    EOF
+  }
+}
+
 resource "aws_ecs_task_definition" "infrastructure_ecs_cluster_service" {
   for_each = local.infrastructure_ecs_cluster_services
 

local-exec-scripts/create-empty-s3-object.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# exit on failures
+set -e
+set -o pipefail
+
+usage() {
+  echo "Usage: $(basename "$0") [OPTIONS]" 1>&2
+  echo "  -h   - help"
+  echo "  -b   - Bucket"
+  echo "  -k   - Key"
+  exit 1
+}
+
+while getopts "b:k:h" opt; do
+  case $opt in
+    b)
+      BUCKET=$OPTARG
+      ;;
+    k)
+      KEY=$OPTARG
+      ;;
+    h)
+      usage
+      ;;
+    *)
+      usage
+      ;;
+  esac
+done
+
+if [[
+  -z "$BUCKET" ||
+  -z "$KEY"
+]]
+then
+  usage
+fi
+
+if ! aws s3api head-object --bucket "$BUCKET" --key "$KEY" 2>/dev/null
+then
+    # If the file does not exist, create an empty file
+    touch /tmp/empty_file.txt
+    aws s3api put-object --bucket "$BUCKET" --key "$KEY" --body /tmp/empty_file.txt
+    rm /tmp/empty_file.txt
+    echo "==> Empty file created in S3 bucket"
+else
+    echo "==> File already exists in S3 bucket, skipping creation"
+fi