Helm install script

scripts/install.sh

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+#!/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 k8s and OCP
+#
+# Requires: oc or kubectl
+
+usage() {
+echo "
+This script simplifies and automates the installation process of Helm charts on Kubernetes (K8s) and OpenShift Container Platform (OCP) clusters.
+It detects whether 'oc' or 'kubectl' is installed and ensures that the user is logged into a cluster.
+The script also attempts to detect the cluster router base and updates the Helm chart configuration accordingly.
+
+Usage:
+  $0 [OPTIONS]
+
+Options:
+  --cli <oc|kubectl>          : Specify the CLI tool to use (overrides auto-detection).
+  --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).
+  --help                      : Show this help message and exit.
+
+Examples:
+  $0                               # Auto-detects router base and installs the Helm chart
+  $0 --cli kubectl                 # Uses kubectl even if oc is installed
+  $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
+"
+}
+
+# Function to check if a command exists
+command_exists() {
+    command -v "$1" >/dev/null 2>&1
+}
+
+# Check if required files and directories exist
+HELM_CHART_DIR="../charts/backstage"
+VALUES_FILE="$HELM_CHART_DIR/values.yaml"
+
+if [ ! -d "$HELM_CHART_DIR" ]; then
+    echo "Error: Helm chart directory not found at $HELM_CHART_DIR"
+    exit 1
+fi
+
+if [ ! -f "$VALUES_FILE" ]; then
+    echo "Error: values.yaml file not found at $VALUES_FILE"
+    exit 1
+fi
+
+# Default CLI detection
+detect_cli() {
+    if command_exists oc; then
+        CLI="oc"
+    elif command_exists kubectl; then
+        CLI="kubectl"
+    else
+        echo "Error: Neither 'oc' nor 'kubectl' is installed. Please install one of them to proceed."
+        exit 1
+    fi
+}
+
+# Parse command-line arguments
+CLI=""
+ROUTER_BASE=""
+RELEASE_NAME=""
+GENERATE_NAME=false
+NAMESPACE=""
+
+while [[ "$#" -gt 0 ]]; do
+    case $1 in
+        --cli)
+            CLI="$2"
+            if [[ "$CLI" != "oc" && "$CLI" != "kubectl" ]]; then
+                echo "Error: Invalid value for --cli. Use 'oc' or 'kubectl'."
+                exit 1
+            fi
+            shift
+            ;;
+        --router-base)
+            ROUTER_BASE="$2"
+            shift
+            ;;
+        --release-name)
+            RELEASE_NAME="$2"
+            shift
+            ;;
+        --generate-name)
+            GENERATE_NAME=true
+            ;;
+        --namespace)
+            NAMESPACE="$2"
+            shift
+            ;;
+        --help)
+            usage
+            exit 0
+            ;;
+        *)
+            echo "Unknown parameter passed: $1"
+            usage
+            exit 1
+            ;;
+    esac
+    shift
+done
+
+# If CLI is not specified, detect automatically
+if [[ -z "$CLI" ]]; then
+    detect_cli
+fi
+
+# Check if the user is logged into a cluster
+if ! $CLI whoami >/dev/null 2>&1; then
+    echo "Error: You are not logged into a cluster. Please log in using '$CLI login' or '$CLI config set-context'."
+    exit 1
+fi
+
+# Function to detect cluster router base
+detect_cluster_router_base() {
+    if [ "$CLI" == "oc" ]; then
+        ROUTER_BASE=$($CLI get route -n openshift-console -o=jsonpath='{.items[0].spec.host}')
+    else
+        ROUTER_BASE=$($CLI get ingress -n default -o=jsonpath='{.items[0].spec.rules[0].host}')
+    fi
+}
+
+# Detect cluster router base if not provided
+if [[ -z "$ROUTER_BASE" ]]; then
+    detect_cluster_router_base
+fi
+
+# If detection fails, prompt user for input
+if [[ -z "$ROUTER_BASE" ]]; then
+    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 "$NAMESPACE" ]]; then
+    NAMESPACE=$($CLI config view --minify --output 'jsonpath={..namespace}')
+    if [[ -z "$NAMESPACE" ]]; then
+        echo "Error: Namespace could not be detected. Please provide it using the --namespace flag."
+        exit 1
+    fi
+fi
+
+# Update Helm chart with the detected or provided router base
+echo "Using router base: $ROUTER_BASE"
+sed -i "s|routerBase:.*|routerBase: $ROUTER_BASE|" "$VALUES_FILE"
+
+# Construct Helm install command
+HELM_CMD="helm install"
+if $GENERATE_NAME; then
+    HELM_CMD+=" --generate-name"
+else
+    if [[ -z "$RELEASE_NAME" ]]; then
+        echo "Error: Either --release-name must be specified or --generate-name must be used."
+        exit 1
+    fi
+    HELM_CMD+=" $RELEASE_NAME"
+fi
+
+HELM_CMD+=" $HELM_CHART_DIR --values $VALUES_FILE --namespace $NAMESPACE"
+
+# Execute Helm install command
+eval $HELM_CMD
+
+echo "Helm installation completed successfully."