Add support for custom Helm chart repo, URL, and service name in loki installer script

Author: vish6760

bin/install-loki.sh

@@ -1,24 +1,27 @@
 #!/bin/bash
-# Description: Fetches the version for Loki from the specified YAML file and executes a helm upgrade/install command.
+# Description: Fetches the version for SERVICE_NAME_DEFAULT from the specified
+# YAML file and executes a helm upgrade/install command with dynamic values files.
 
 # Disable SC2124 (unused array), SC2145 (array expansion issue), SC2294 (eval)
 # shellcheck disable=SC2124,SC2145,SC2294
 
 # Service
-SERVICE_NAME="loki"
+SERVICE_NAME_DEFAULT="loki"
 SERVICE_NAMESPACE="grafana"
 
 # Helm
-HELM_REPO_NAME="grafana"
-HELM_REPO_URL="https://grafana.github.io/helm-charts"
+HELM_REPO_NAME_DEFAULT="grafana"
+HELM_REPO_URL_DEFAULT="https://grafana.github.io/helm-charts"
 
 # Base directories provided by the environment
 GENESTACK_BASE_DIR="${GENESTACK_BASE_DIR:-/opt/genestack}"
 GENESTACK_OVERRIDES_DIR="${GENESTACK_OVERRIDES_DIR:-/etc/genestack}"
 
 # Define service-specific override directories based on the framework
-SERVICE_BASE_OVERRIDES="${GENESTACK_BASE_DIR}/base-helm-configs/${SERVICE_NAME}"
-SERVICE_CUSTOM_OVERRIDES="${GENESTACK_OVERRIDES_DIR}/helm-configs/${SERVICE_NAME}"
+SERVICE_BASE_OVERRIDES="${GENESTACK_BASE_DIR}/base-helm-configs/${SERVICE_NAME_DEFAULT}"
+SERVICE_CUSTOM_OVERRIDES="${GENESTACK_OVERRIDES_DIR}/helm-configs/${SERVICE_NAME_DEFAULT}"
+
+# Define the Global Overrides directory used in the original script
 GLOBAL_OVERRIDES_DIR="${GENESTACK_OVERRIDES_DIR}/helm-configs/global_overrides"
 
 # Read the desired chart version from VERSION_FILE
@@ -29,23 +32,58 @@ if [ ! -f "$VERSION_FILE" ]; then
     exit 1
 fi
 
-# Extract version dynamically using the SERVICE_NAME variable
-SERVICE_VERSION=$(grep "^[[:space:]]*${SERVICE_NAME}:" "$VERSION_FILE" | sed "s/.*${SERVICE_NAME}: *//")
+# Extract version dynamically using the SERVICE_NAME_DEFAULT variable
+SERVICE_VERSION=$(grep "^[[:space:]]*${SERVICE_NAME_DEFAULT}:" "$VERSION_FILE" | sed "s/.*${SERVICE_NAME_DEFAULT}: *//")
 
 if [ -z "$SERVICE_VERSION" ]; then
-    echo "Error: Could not extract version for '$SERVICE_NAME' from $VERSION_FILE" >&2
+    echo "Error: Could not extract version for '$SERVICE_NAME_DEFAULT' from $VERSION_FILE" >&2
     exit 1
 fi
 
-echo "Found version for $SERVICE_NAME: $SERVICE_VERSION"
+echo "Found version for $SERVICE_NAME_DEFAULT: $SERVICE_VERSION"
+
+# Load chart metadata from custom override YAML if defined
+for yaml_file in "${SERVICE_CUSTOM_OVERRIDES}"/*.yaml; do
+    if [ -f "$yaml_file" ]; then
+        HELM_REPO_URL=$(yq eval '.chart.repo_url // ""' "$yaml_file")
+        HELM_REPO_NAME=$(yq eval '.chart.repo_name // ""' "$yaml_file")
+        SERVICE_NAME=$(yq eval '.chart.service_name // ""' "$yaml_file")
+        break  # use the first match and stop
+    fi
+done
+
+# Fallback to defaults if variables not set
+: "${HELM_REPO_URL:=$HELM_REPO_URL_DEFAULT}"
+: "${HELM_REPO_NAME:=$HELM_REPO_NAME_DEFAULT}"
+: "${SERVICE_NAME:=$SERVICE_NAME_DEFAULT}"
+
+
+# Determine Helm chart path
+if [[ "$HELM_REPO_URL" == oci://* ]]; then
+    # OCI registry path
+    HELM_CHART_PATH="$HELM_REPO_URL/$HELM_REPO_NAME/$SERVICE_NAME"
+else
+    # --- Helm Repository and Execution ---
+    helm repo add "$HELM_REPO_NAME" "$HELM_REPO_URL"   # uncomment if needed
+    helm repo update
+    HELM_CHART_PATH="$HELM_REPO_NAME/$SERVICE_NAME"
+fi
+
+# Debug output
+echo "[DEBUG] HELM_REPO_URL=$HELM_REPO_URL"
+echo "[DEBUG] HELM_REPO_NAME=$HELM_REPO_NAME"
+echo "[DEBUG] SERVICE_NAME=$SERVICE_NAME"
+echo "[DEBUG] HELM_CHART_PATH=$HELM_CHART_PATH"
 
 # Prepare an array to collect -f arguments
 overrides_args=()
 
 # Include all YAML files from the BASE configuration directory
+# NOTE: Files in this directory are included first.
 if [[ -d "$SERVICE_BASE_OVERRIDES" ]]; then
     echo "Including base overrides from directory: $SERVICE_BASE_OVERRIDES"
     for file in "$SERVICE_BASE_OVERRIDES"/*.yaml; do
+        # Check that there is at least one match
         if [[ -e "$file" ]]; then
             echo " - $file"
             overrides_args+=("-f" "$file")
@@ -56,19 +94,21 @@ else
 fi
 
 # Include all YAML files from the GLOBAL configuration directory
+# NOTE: Files here override base settings and are applied before service-specific ones.
 if [[ -d "$GLOBAL_OVERRIDES_DIR" ]]; then
-    echo "Including overrides from global config directory:"
+    echo "Including global overrides from directory: $GLOBAL_OVERRIDES_DIR"
     for file in "$GLOBAL_OVERRIDES_DIR"/*.yaml; do
         if [[ -e "$file" ]]; then
             echo " - $file"
             overrides_args+=("-f" "$file")
         fi
     done
 else
-    echo "Warning: Global config directory not found: $GLOBAL_OVERRIDES_DIR"
+    echo "Warning: Global override directory not found: $GLOBAL_OVERRIDES_DIR"
 fi
 
 # Include all YAML files from the custom SERVICE configuration directory
+# NOTE: Files here have the highest precedence.
 if [[ -d "$SERVICE_CUSTOM_OVERRIDES" ]]; then
     echo "Including overrides from service config directory:"
     for file in "$SERVICE_CUSTOM_OVERRIDES"/*.yaml; do
@@ -83,16 +123,12 @@ fi
 
 echo
 
-# --- Helm Repository and Execution ---
-helm repo add "$HELM_REPO_NAME" "$HELM_REPO_URL"
-helm repo update
-
 # Collect all --set arguments.
 set_args=()
 
 
 helm_command=(
-    helm upgrade --install "$SERVICE_NAME" "$HELM_REPO_NAME/$SERVICE_NAME"
+    helm upgrade --install "$SERVICE_NAME_DEFAULT" "$HELM_CHART_PATH"
     --version "${SERVICE_VERSION}"
     --namespace="$SERVICE_NAMESPACE"
     --timeout 120m
@@ -101,8 +137,9 @@ helm_command=(
     "${overrides_args[@]}"
     "${set_args[@]}"
 
+    # Post-renderer configuration
     --post-renderer "$GENESTACK_OVERRIDES_DIR/kustomize/kustomize.sh"
-    --post-renderer-args "$SERVICE_NAME/overlay"
+    --post-renderer-args "$SERVICE_NAME_DEFAULT/overlay"
 
     "$@"
 )