IstioOperator CR.
1. The controller has additional logic that mirrors istioctl commands like upgrade, but is driven from the declarative
API rather than command line.

### Quick tour of CLI commands

#### Flags

The `istioctl` command supports the following flags:

- `dry-run`: console output only, nothing applied to cluster or written to files.

  //
  // BorrowingCL(i) = round( NominalCL(i) * borrowingLimitPercent(i)/100.0 )
  //
  // The value of this field can be more than 100, implying that this
  // priority level can borrow a number of seats that is greater than
  // its own nominal concurrency limit (NominalCL).
  // When this field is left `nil`, the limit is effectively infinite.
  // +optional

  //
  // BorrowingCL(i) = round( NominalCL(i) * borrowingLimitPercent(i)/100.0 )
  //
  // The value of this field can be more than 100, implying that this
  // priority level can borrow a number of seats that is greater than
  // its own nominal concurrency limit (NominalCL).
  // When this field is left `nil`, the limit is effectively infinite.
  // +optional

  // Specifies the maximum desired number of pods the job should
  // run at any given time. The actual number of pods running in steady state will
  // be less than this number when ((.spec.completions - .status.successful) < .spec.parallelism),
  // i.e. when the work left to do is less than max parallelism.
  // More info: https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/
  // +optional
  optional int32 parallelism = 1;

  //                     required by the PodDisruptionBudget. No disruptions are
  //                     allowed and the status of the condition will be False.
  // - SufficientPods: There are more pods than required by the PodDisruptionBudget.
  //                   The condition will be True, and the number of allowed
  //                   disruptions are provided by the disruptionsAllowed property.
  //
  // +optional

set -o errexit
set -o nounset
set -o pipefail

if [[ "${TARGET_OUT_LINUX:-}" == "" ]]; then
  echo "Environment variables not set. Make sure you run through the makefile (\`make init\`) rather than directly."
  exit 1
fi

# Setup arch suffix for envoy binary. For backwards compatibility, amd64 has no suffix.
if [[ "${TARGET_ARCH}" == "amd64" ]]; then
	ISTIO_ENVOY_ARCH_SUFFIX=""
else

  // same controller. For example, you may have different parameters for the
  // same implementing controller. This should be specified as a
  // domain-prefixed path no more than 250 characters in length, e.g.
  // "acme.io/ingress-controller". This field is immutable.
  optional string controller = 1;

  // parameters is a link to a custom resource containing additional

  // everywhere.
  // +optional
  optional k8s.io.api.core.v1.NodeSelector availableOnNodes = 2;

  // Shareable determines whether the resource supports more
  // than one consumer at a time.
  // +optional
  optional bool shareable = 3;
}

// PodSchedulingContext objects hold information that is needed to schedule
// a Pod with ResourceClaims that use "WaitForFirstConsumer" allocation

  // same controller. For example, you may have different parameters for the
  // same implementing controller. This should be specified as a
  // domain-prefixed path no more than 250 characters in length, e.g.
  // "acme.io/ingress-controller". This field is immutable.
  optional string controller = 1;

  // parameters is a link to a custom resource containing additional

  // reinvocationPolicy indicates whether this webhook should be called multiple times as part of a single admission evaluation.
  // Allowed values are "Never" and "IfNeeded".
  //
  // Never: the webhook will not be called more than once in a single admission evaluation.
  //
  // IfNeeded: the webhook will be called at least one additional time as part of the admission evaluation