feat(dev): allow .env to be sourced when bringing up/down a cluster

Previously, cluster-up.sh and cluster-down.sh both had similar code to
clone the local-dev-cluster repo. This is now moved to a single script.

The scripts also `cd` in local-dev-cluster dir which meant that a .env
file at the root of kepler project will not be honored by the
local-dev-cluster/main.sh. This has been fixed by invoking the
main.sh from the root of kepler project itself

This commit modifies the cluster-up and down targets to
  * clone local-dev-cluster to tmp dir (which is ignored by git)
  * sources .env in project root where settings that needs to
    passed down to local-dev-cluster can be kept. E.g.
    ```sh
     PROMETHEUS_ENABLE=true
     GRAFANA_ENABLE=true
    ```
Signed-off-by: Sunil Thaha <[email protected]>

.gitignore

@@ -39,3 +39,4 @@ local-dev-cluster
 *.test
 *.cache
 /tmp
+.env

Makefile

@@ -340,11 +340,11 @@ cluster-sync:
 .PHONY: cluster-sync
 
 cluster-up:
-	./hack/cluster-up.sh
+	./hack/cluster.sh up
 .PHONY: cluster-up
 
 cluster-down:
-	./hack/cluster-down.sh
+	./hack/cluster.sh down
 .PHONY: cluster-down
 
 e2e:

hack/cluster.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+#
+# This file is part of the Kepler project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Copyright 2022 The Kepler Contributors
+#
+set -eu -o pipefail
+
+# NOTE: assumes that the project root is one level up
+PROJECT_ROOT=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." >/dev/null 2>&1 && pwd)
+declare -r PROJECT_ROOT
+
+# NOTE: this allows common settings to be stored as `.env` file
+# shellcheck disable=SC1091
+[[ -f "$PROJECT_ROOT/.env" ]] && source "$PROJECT_ROOT/.env"
+
+# NOTE: these settings can be overridden in the .env file
+declare -r LOCAL_DEV_CLUSTER_DIR="${LOCAL_DEV_CLUSTER_DIR:-"$PROJECT_ROOT/local-dev-cluster"}"
+declare -r LOCAL_DEV_CLUSTER_VERSION="${LOCAL_DEV_CLUSTER_VERSION:-v0.0.3}"
+
+# Supported CLUSTER_PROVIDER are kind,microshift
+export CLUSTER_PROVIDER=${CLUSTER_PROVIDER:-kind}
+
+clone_local_dev_cluster() {
+	if [ -d "$LOCAL_DEV_CLUSTER_DIR" ]; then
+		echo "using local local-dev-cluster"
+		return 0
+	fi
+
+	echo "downloading local-dev-cluster"
+	git clone -b "$LOCAL_DEV_CLUSTER_VERSION" \
+		https://github.com/sustainable-computing-io/local-dev-cluster.git \
+		--depth=1 \
+		"$LOCAL_DEV_CLUSTER_DIR"
+}
+
+main() {
+	local op="$1"
+	shift
+
+	cd "$PROJECT_ROOT"
+
+	clone_local_dev_cluster
+	echo "Bringing cluster - $op"
+	"$LOCAL_DEV_CLUSTER_DIR/main.sh" "$op"
+}
+
+main "$@"