helm mode: Handle azure.resourceGroup Helm value

install/azure.go

@@ -9,6 +9,8 @@ import (
 	"fmt"
 
 	"github.com/cilium/cilium/pkg/versioncheck"
+	"helm.sh/helm/v3/pkg/cli"
+	"helm.sh/helm/v3/pkg/getter"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
@@ -81,6 +83,27 @@ func (k *K8sInstaller) azureRetrieveSubscriptionID() error {
 	return nil
 }
 
+// setAzureResourceGroupFromHelmValue checks if azure.resourceGroup Helm value is set,
+// and overwrites params.Azure.ResourceGroupName if it is set.
+func (k *K8sInstaller) setAzureResourceGroupFromHelmValue() error {
+	values, err := k.params.HelmOpts.MergeValues(getter.All(cli.New()))
+	if err != nil {
+		return err
+	}
+	azure, ok := values["azure"].(map[string]interface{})
+	if !ok {
+		return nil
+	}
+	resourceGroupName, ok := azure["resourceGroup"].(string)
+	if !ok {
+		return nil
+	}
+	if resourceGroupName != "" {
+		k.params.Azure.ResourceGroupName = resourceGroupName
+	}
+	return nil
+}
+
 // `az aks create` requires an existing resource group in which to create a
 // new AKS cluster, but a single resource group may hold multiple AKS clusters.
 //
@@ -110,8 +133,11 @@ func (k *K8sInstaller) azureRetrieveAKSClusterInfo() error {
 		return nil
 	}
 
+	if err := k.setAzureResourceGroupFromHelmValue(); err != nil {
+		return err
+	}
 	if k.params.Azure.ResourceGroupName == "" {
-		k.Log("❌ Azure resource group is required, please specify --azure-resource-group")
+		k.Log("❌ Azure resource group is required, please specify --azure-resource-group or azure.resourceGroup Helm value")
 		return fmt.Errorf("missing Azure resource group name")
 	}
 

install/azure_test.go

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Authors of Cilium
+
+package install
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"helm.sh/helm/v3/pkg/cli/values"
+)
+
+func TestK8sInstaller_setAzureResourceGroupFromHelmValue(t *testing.T) {
+	nameFromFlag := "name-from-flag"
+	nameFromHelmValue := "name-from-helm-value"
+
+	// Test the case where --azure-resource-group flag is set.
+	installer := &K8sInstaller{
+		params: Parameters{
+			Azure: AzureParameters{ResourceGroupName: nameFromFlag},
+		},
+	}
+	err := installer.setAzureResourceGroupFromHelmValue()
+	assert.NoError(t, err)
+	assert.Equal(t, nameFromFlag, installer.params.Azure.ResourceGroupName)
+
+	// Test the case where azure.resourceGroup Helm value is set.
+	installer = &K8sInstaller{
+		params: Parameters{
+			HelmOpts: values.Options{
+				Values: []string{fmt.Sprintf("azure.resourceGroup=%s", nameFromHelmValue)},
+			},
+		},
+	}
+	err = installer.setAzureResourceGroupFromHelmValue()
+	assert.NoError(t, err)
+	assert.Equal(t, nameFromHelmValue, installer.params.Azure.ResourceGroupName)
+}