From 425bde9636374edbf9d9c84e8cbba40a0f44506f Mon Sep 17 00:00:00 2001
From: Anthony Zawacki <anthony.c.zawacki@census.gov>
Date: Tue, 12 Sep 2023 14:39:29 -0400
Subject: [PATCH] Added create_namespace to make it possible to install
 prometheus into an existing namespace.

---
 main.tf      | 19 ++++++++++++++++++-
 variables.tf |  6 ++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/main.tf b/main.tf
index e9ffe29..0146d40 100644
--- a/main.tf
+++ b/main.tf
@@ -1,14 +1,31 @@
 
 resource "kubernetes_namespace" "ns" {
+  count = var.create_namespace == true ? 1 : 0
+
   metadata {
     name = var.namespace
+    labels = {
+      istio-injection = "enabled"
+    }
   }
 }
 
+data "kubernetes_namespace" "existing-ns" {
+  count = var.create_namespace == true ? 0 : 1
+
+  metadata {
+    name = var.namespace
+  }
+}
+
+locals {
+  ns = try(kubernetes_namespace.ns[0].metadata[0].name, data.kubernetes_namespace.existing-ns[0].metadata[0].name)
+}
+
 resource "helm_release" "prometheus" {
   chart      = "prometheus"
   name       = "prometheus"
-  namespace  = kubernetes_namespace.ns.metadata[0].name
+  namespace  = local.ns
   version    = var.prometheus_chart_version
   repository = "https://prometheus-community.github.io/helm-charts"
 
diff --git a/variables.tf b/variables.tf
index cd6e568..b6e7a9e 100644
--- a/variables.tf
+++ b/variables.tf
@@ -19,6 +19,12 @@ variable "namespace" {
   default     = "prometheus"
 }
 
+variable "create_namespace" {
+  description = "Indicates whether the `namespace` needs to be created ('true') or already exists (not `true`)"
+  type        = bool
+  default     = true
+}
+
 # helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
 # helm search repo prometheus-community/prometheus | head -2
 variable "prometheus_chart_version" {