Helm install script

scripts/install.md

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+## **Documentation for the script to handle CLI helm installation for OCP**
+
+## **Overview**
+
+The purpose of the [`install.sh` script](./install.sh) is to simplify and automate the installation process of this Helm Chart on OpenShift Container Platform (OCP) clusters. Instead of requiring users to follow a lengthy and potentially error-prone series of manual steps, this script consolidates the process into a single, reusable command that can:
+
+* Detect if the OpenShift Client ([`oc`](https://docs.openshift.com/container-platform/4.16/cli_reference/openshift_cli/getting-started-cli.html)) is installed; fail if not found and report the error to the user with a call to action (installing it).
+
+* If cluster router base can be detected, use that value to update the helm chart installation; if not, fail and request user pass in command line flag as cluster router base could not be detected (can test this failure case with dev sandbox; can test passing case with clusterbot).
+
+## **Prerequisites**
+
+1. Ensure that `oc` (for OpenShift) is installed. See https://docs.openshift.com/container-platform/4.16/cli_reference/openshift_cli/getting-started-cli.html#installing-openshift-cli for further instructions.
+2. Ensure that you are logged into an OCP cluster and that it is running. See [Logging in to the OpenShift CLI](https://docs.redhat.com/en/documentation/openshift_container_platform/4.16/html/cli_tools/openshift-cli-oc#cli-logging-in_cli-developer-commands).
+3. git
+4. [Helm](https://helm.sh/docs/intro/install/)
+
+## **Installation Steps**
+
+1. **Download the Script** - Clone the repository and navigate to the `scripts` directory: 
+
+     ```shell
+      git clone --depth 1 https://github.com/redhat-developer/rhdh-chart.git
+      cd rhdh-charts/scripts
+    ```
+
+2. **Run the Script** - Execute the script to install the Helm chart. The script will automatically detect that you are using `oc` and ensure you are logged into your cluster. \
+`./install.sh`
+
+3. **Specify Router Base** - If the script cannot automatically detect the cluster router base, you can provide it manually using the `--router-base` flag, example:\
+      `./install.sh --router-base <your-router-base>`
+
+4. **Specify Release Name** - To install the Helm chart with a custom release name: \
+   `./install.sh --release-name myrelease`
+
+5. **Generate a Release Name** - To generate a name for the Helm release: \
+    `./install.sh --generate-name`
+
+6. **Specify Namespace** - To specify the namespace for the Helm release: \
+`./install.sh --namespace mynamespace`
+
+7. **Specify Custom Values File** - To use a custom values file for the Helm chart: \
+   `./install.sh --values /path/to/values.yaml`
+
+## **Troubleshooting**
+
+* Missing <code>oc</code> - </strong> If the script outputs an error indicating <code>oc</code> is not installed, please install the CLI tool for your cluster:
+    * For OpenShift: Install <code>oc</code>
+
+* <strong>Not Logged Into Cluster: </strong> If you are not logged into a cluster, follow these steps to log in:
+    * For OpenShift:
+ `oc login <your-cluster-url>`
+
+* <strong>Router Base Detection Failed: - </strong> If the script cannot detect the cluster router base, manually provide it using the <code>--router-base</code> flag as shown in the example usage section.
+
+* <strong>Error: INSTALLATION FAILED:</strong>
+
+     An error occurred while checking for chart dependencies. You may need to run `helm dependency build` to fetch missing dependencies: found in Chart.yaml, but missing in charts/ directory: common, backstage:
+  `helm dependency build`
+
+An example of the installation output should be:
+
+Using router base: example.com
+
+NAME: ...
+
+LAST DEPLOYED: ...
+
+NAMESPACE: ...
+
+STATUS: ...
+
+REVISION: ...
+
+Helm installation completed successfully.
+
+You can run: `helm list --namespace $myProject` to confirm this installation.

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 OCP
+#
+# Requires: oc 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 "$1" >/dev/null 2>&1
+}
+
+# Check for required commands
+if ! command_exists helm || ! command_exists oc; then
+    echo "Error: Required commands 'helm' and 'oc' are not available."
+    exit 1
+fi
+
+# Check if required files and directories exist
+HELM_CHART_DIR="$(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
+            ;;
+        --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 $NAMESPACE ]]; then
+        echo "Error: Namespace could not be detected. Please provide it using the --namespace flag."
+        exit 1
+    fi
+fi
+
+# Always include the router base in Helm arguments
+EXTRA_HELM_ARGS+=" --set global.clusterRouterBase=$ROUTER_BASE"
+
+# Construct Helm install command
+HELM_CMD="helm install"
+if [[ $GENERATE_NAME == true ]]; then
+    HELM_CMD+=" --generate-name"
+elif [[ -z "$RELEASE_NAME" ]]; then
+    echo "Error: Either --release-name must be specified or --generate-name must be used."
+    exit 1
+else
+    HELM_CMD+=" $RELEASE_NAME"
+fi
+
+HELM_CMD+=" $HELM_CHART_DIR --namespace $NAMESPACE $EXTRA_HELM_ARGS"
+
+# Execute Helm install command
+echo "Executing: $HELM_CMD"
+
+if eval "$HELM_CMD"; then
+    echo "Helm installation completed successfully."
+else
+    echo "Something went wrong with Helm installation!"
+    exit 1
+fi