script CLI helm installation for OCP

scripts/install.sh

@@ -0,0 +1,161 @@
+#!/bin/bash
+#
+#  Copyright (c) 2024 Red Hat, Inc.
+#  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.
+#
+# Script to handle CLI helm installation for OCP
+#
+# Requires: oc, helm and an active login session to a cluster.
+
+set -e
+
+usage() {
+    echo "
+This script simplifies and automates the installation process of Helm charts on the OpenShift Container Platform (OCP) clusters.
+It ensures that the user is logged into a cluster and attempts to detect the cluster router base, updating the Helm chart configuration accordingly.
+
+Usage:
+  $0 [OPTIONS]
+
+Options:
+  --router-base <router-base> : Manually provide the cluster router base if auto-detection fails.
+  --release-name <name>       : Specify a custom release name for the Helm chart.
+  --generate-name             : Generate a name for the Helm release (overrides --release-name).
+  --namespace <namespace>     : Specify the namespace for the Helm release (autodetects if not provided).
+  --values <file>             : Specify your own values file for the Helm chart.
+  --help                      : Show this help message and exit.
+
+Examples:
+  $0                               # Auto-detects router base and installs the Helm chart
+  $0 --router-base example.com     # Manually specifies the router base and installs the Helm chart
+  $0 --release-name myrelease      # Installs the Helm chart with the specified release name
+  $0 --generate-name               # Generates a name for the Helm release
+  $0 --values /path/to/values.yaml # Installs the Helm chart using the specified values file
+"
+}
+
+# Function to check if a command exists
+command_exists() {
+    command -v "$1" >/dev/null 2>&1
+}
+
+# Check for required commands
+if ! command_exists helm; then
+    echo "Error: 'helm' is required. Install it from https://docs.openshift.com/container-platform/4.16/applications/working_with_helm_charts/installing-helm.html to continue."
+    exit 1
+fi
+if ! command_exists oc; then
+    echo "Error: 'oc' is required. Install it from https://docs.openshift.com/container-platform/4.16/cli_reference/openshift_cli/getting-started-cli.html to continue."
+    exit 1
+fi
+
+# Check if required files and directories exist
+HELM_CHART_DIR="$(dirname "$0")/../charts/backstage"
+DEFAULT_VALUES_FILE="$HELM_CHART_DIR/values.yaml"
+
+if [ ! -d "$HELM_CHART_DIR" ]; then
+    echo "Error: Helm chart directory not found at $HELM_CHART_DIR"
+    exit 1
+fi
+
+# Parse command-line arguments
+ROUTER_BASE=""
+RELEASE_NAME=""
+GENERATE_NAME=false
+NAMESPACE=""
+VALUES_FILE="$DEFAULT_VALUES_FILE"
+EXTRA_HELM_ARGS=""
+
+while [[ "$#" -gt 0 ]]; do
+    case $1 in
+        --router-base)
+            ROUTER_BASE="$2"
+            shift
+            ;;
+        --release-name)
+            RELEASE_NAME="$2"
+            shift
+            ;;
+        --generate-name)
+            GENERATE_NAME=true
+            ;;
+        --namespace)
+            NAMESPACE="$2"
+            shift
+            ;;
+        --values)
+            VALUES_FILE="$2"
+            shift
+            ;;
+        --help)
+            usage
+            exit 0
+            ;;
+        *)
+            EXTRA_HELM_ARGS+=" $1"
+            ;;
+    esac
+    shift
+done
+
+# Function to detect cluster router base
+detect_cluster_router_base() {
+    ROUTER_BASE=$(oc get ingress.config.openshift.io/cluster -o=jsonpath='{.spec.domain}')
+}
+
+# Detect cluster router base if not provided
+if [[ -z "$ROUTER_BASE" ]]; then
+    detect_cluster_router_base || (echo "Error: Cluster router base could not be detected. Please provide it using the --router-base flag." && exit 1)
+fi
+
+# Detect namespace if not provided
+if [[ -z "$NAMESPACE" ]]; then
+    NAMESPACE=$(oc config view --minify --output 'jsonpath={..namespace}')
+    if [[ -z $NAMESPACE ]]; then
+        NAMESPACE="default"
+    fi
+fi
+
+# Create namespace if it doesn't exist
+if ! oc get namespace "$NAMESPACE" >/dev/null 2>&1; then
+    echo "Namespace '$NAMESPACE' does not exist. Creating it..."
+    oc create namespace "$NAMESPACE"
+fi
+
+# Always include the router base in Helm arguments
+EXTRA_HELM_ARGS+=" --set global.clusterRouterBase=$ROUTER_BASE"
+
+# Construct Helm install or upgrade command
+if [[ $GENERATE_NAME == true ]]; then
+    HELM_CMD="helm install --generate-name"
+else
+    if [[ -z "$RELEASE_NAME" ]]; then
+        echo "Error: Either --release-name must be specified or --generate-name must be used."
+        exit 1
+    else
+        HELM_CMD="helm upgrade -i $RELEASE_NAME"
+    fi
+fi
+
+HELM_CMD+=" $HELM_CHART_DIR --namespace $NAMESPACE --values $VALUES_FILE $EXTRA_HELM_ARGS"
+
+# Execute Helm install or upgrade command
+echo "Executing: $HELM_CMD"
+
+if eval "$HELM_CMD"; then
+    echo "Helm installation completed successfully."
+else
+    echo "Something went wrong with Helm installation!"
+    helm list --namespace "$NAMESPACE"
+    exit 1
+fi