validate_helm_chart: add support for oci repositories

Signed-off-by: André Martins <andre@cilium.io>

Author: aanm

validate_helm_chart.sh

@@ -17,10 +17,12 @@ yq () {
 }
 
 usage() {
-    >&2 echo "usage: $0 <chart-tgz-file>"
+    >&2 echo "usage: $0 <chart-tgz-file|oci-chart-reference>"
     >&2 echo
     >&2 echo "example: $0 cilium-1.15.5.tgz"
     >&2 echo "example: $0 tetragon-1.1.0.tgz"
+    >&2 echo "example: $0 oci://registry.example.com/cilium/cilium:1.15.5"
+    >&2 echo "example: $0 oci://registry.example.com/cilium/tetragon:1.1.0"
 }
 
 CILIUM_IMAGE_PATHS=(
@@ -36,17 +38,25 @@ TETRAGON_IMAGE_PATHS=(
   '{$.tetragonOperator.image.tag}'
 )
 
-# $1 - Helm chart tgz file
+# $1 - Helm chart tgz file or OCI chart reference
 main() {
-  TGZ="$1"
+  CHART="$1"
 
-  if [ ! -f "$TGZ" ]; then
-      echo "ERROR: Chart tgz file not found: $TGZ"
+  if [ -z "$CHART" ]; then
+      echo "ERROR: Chart argument is required"
       usage
       exit 1
   fi
-  APP=$(helm show chart "$TGZ" | yq e '.name' -)
-  CHART_VERSION=$(helm show chart "$TGZ" | yq e '.version' -)
+
+  # Check if it's an OCI chart (starts with oci://) or a file
+  if [[ ! "$CHART" =~ ^oci:// ]] && [ ! -f "$CHART" ]; then
+      echo "ERROR: Chart file not found: $CHART"
+      usage
+      exit 1
+  fi
+
+  APP=$(helm show chart "$CHART" | yq e '.name' -)
+  CHART_VERSION=$(helm show chart "$CHART" | yq e '.version' -)
   if [ "$APP" == "cilium" ]; then
     IMAGE_PATHS=("${CILIUM_IMAGE_PATHS[@]}")
   elif [ "$APP" == "tetragon" ]; then
@@ -57,7 +67,7 @@ main() {
   fi
 
   for path in "${IMAGE_PATHS[@]}"; do
-    tag=$(helm show values --jsonpath "$path" "$TGZ")
+    tag=$(helm show values --jsonpath "$path" "$CHART")
     if [ "$tag" == "v$CHART_VERSION" ]; then
       echo "SUCCESS: $APP $path=$tag matches chart version $CHART_VERSION"
     else