From 721f9b73260708af8b6a12c9288091a9c3bddaf4 Mon Sep 17 00:00:00 2001
From: jschaul <jschaul@users.noreply.github.com>
Date: Tue, 13 Jul 2021 12:28:00 +0200
Subject: [PATCH] makefile target for helm templating charts

---
 Makefile                  |  8 ++++++++
 hack/bin/helm-template.sh | 24 ++++++++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100755 hack/bin/helm-template.sh

diff --git a/Makefile b/Makefile
index 52583a0911a..1804a8d9d4c 100644
--- a/Makefile
+++ b/Makefile
@@ -416,3 +416,11 @@ kind-restart-%: .local/kind-kubeconfig
 	kubectl delete pod -n $(NAMESPACE) -l wireService=$(*) && \
 	kubectl delete pod -n $(NAMESPACE)-fed2 -l wireService=$(*)
 
+# This target can be used to template a helm chart with values filled in from
+# hack/helm_vars (what CI uses) as overrrides, if available. This allows debugging helm
+# templating issues without actually installing anything, and without needing
+# access to a kubernetes cluster. e.g.:
+#   make helm-template-wire-server
+helm-template-%: clean-charts charts-integration
+	./hack/bin/helm-template.sh $(*)
+
diff --git a/hack/bin/helm-template.sh b/hack/bin/helm-template.sh
new file mode 100755
index 00000000000..0cd1306f56e
--- /dev/null
+++ b/hack/bin/helm-template.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# This script can be used to template a helm chart with values filled in from
+# hack/helm_vars as overrrides, if available.  This allows debugging helm
+# templating issues without actually installing anything, and without needing
+# access to a kubernetes cluster
+USAGE="Usage: $0"
+
+set -e
+
+chart=${1:?$USAGE}
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TOP_LEVEL="$DIR/../.."
+CHARTS_DIR="${TOP_LEVEL}/.local/charts"
+
+valuesfile="${DIR}/../helm_vars/${chart}/values.yaml"
+declare -a options=()
+if [ -f "$valuesfile" ]; then
+    options+=(-f "$valuesfile")
+fi
+
+"$DIR/update.sh" "$CHARTS_DIR/$chart"
+helm template $"chart" "$CHARTS_DIR/$chart" ${options[*]}