makefile target for helm templating charts (#1660)

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 $(*)
+

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[*]}