Generate longhorn.yaml based on chart

longhorn #3716

Signed-off-by: David Ko <dko@suse.com>

scripts/generate-longhorm-yaml.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o xtrace
+
+PRJ_DIR=$(readlink -f "$(dirname "${BASH_SOURCE[0]}")/.." 2>/dev/null || realpath "$(dirname "${BASH_SOURCE[0]}")/.." 2>/dev/null)
+CHART_DIR="$PRJ_DIR/chart"
+DEPLOY_YAML="$PRJ_DIR/deploy/longhorn.yaml"
+DEPLOY_YAML_TMP="$PRJ_DIR/deploy/longhorn.yaml.tmp"
+NAMESPACE=${NAMESPACE:-longhorn-system}
+
+if ! command -v helm &> /dev/null || ! helm version --short | grep -q "v3"; then
+  echo "Please install helm v3 first before generating $DEPLOY_YAML!"
+  exit 1
+fi
+
+cat <<EOD > "$DEPLOY_YAML"
+---
+# Builtin: "helm template" does not respect --create-namespace
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: $NAMESPACE
+EOD
+
+helm template longhorn "$CHART_DIR" --namespace "$NAMESPACE" --create-namespace --no-hooks >>"$DEPLOY_YAML"
+< "$DEPLOY_YAML" grep -v 'helm.sh\|app.kubernetes.io/managed-by: Helm' | grep -v "helm.sh/chart:" > "$DEPLOY_YAML_TMP"
+mv "$DEPLOY_YAML_TMP" "$DEPLOY_YAML"
+
+