else
  SHA=$(grep "istio.io/api" go.mod | head -n1 | awk '{ print $2 }')
  if [[ ${SHA} == *"-"* && ! ${SHA} =~ -rc.[0-9]$ && ! ${SHA} =~ -beta.[0-9]$ && ! ${SHA} =~ -alpha.[0-9]$ ]]; then
    # not an official release or release candidate, so get the commit sha
    SHA=$(echo "${SHA}" | awk -F '-' '{ print $NF }')
  fi
fi

if [ -z "${SHA}" ]; then

## Everything is Optional

Each component in the new installer is optional. Users can install the component defined in the new installer,
use the equivalent component in `istio-system`, configured with the official installer, or use a different
version or implementation.

For example, you may use your own Prometheus and Grafana installs, or you may use a specialized/custom

using Helm values that are incompatible, the schema validation used in the operator may reject input that is valid for
Helm.
Each Istio component has K8s settings, and these can be overridden from the defaults using official K8s APIs rather than
Istio defined schemas ([samples/pilot-k8s.yaml](samples/pilot-k8s.yaml)):

```yaml
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  components:
    pilot:

`gateways.istio-ingressgateway.*`, release name and namespace taken into account, etc). * Utilizes Gateway injection, simplifying upgrades, allowing gateways to run in any namespace, and avoiding repeating config for sidecars and gateways. * Published to official Istio Helm repository. * Single chart for all gateways (Ingress, Egress, East West). #### General concerns For a smooth migration, the resource names and `Deployment.spec.selector` labels must match. If you install with `helm install istio-gateway...

  // a direct binding between Ingress controller and Ingress resources. Newly
  // created Ingress resources should prefer using the field. However, even
  // though the annotation is officially deprecated, for backwards compatibility
  // reasons, ingress controllers should still honor that annotation if present.
  // +optional
  optional string ingressClassName = 4;

* Utilizes Gateway injection, simplifying upgrades, allowing gateways to run in any namespace, and avoiding repeating config for sidecars and gateways.
* Published to official Istio Helm repository.
* Single chart for all gateways (Ingress, Egress, East West).

#### General concerns

For a smooth migration, the resource names and `Deployment.spec.selector` labels must match.