data, ok := c.(Data)
		if !ok {
			return errors.New("control-plane phase invoked with an invalid data struct")
		}

		// if this is not a control-plane node, this phase should not be executed
		if !data.IsControlPlaneNode() {
			fmt.Println("[upgrade] Skipping phase. Not a control plane node.")
			return nil
		}

		// otherwise, retrieve all the info required for control plane upgrade
		cfg := data.InitCfg()

		}
	}
}

func (d *decoder) readGraphicControl() error {
	if err := readFull(d.r, d.tmp[:6]); err != nil {
		return fmt.Errorf("gif: can't read graphic control: %s", err)
	}
	if d.tmp[0] != 4 {
		return fmt.Errorf("gif: invalid graphic control extension block size: %d", d.tmp[0])
	}
	flags := d.tmp[1]
	d.disposalMethod = (flags & gcDisposalMethodMask) >> 2
	d.delayTime = int(d.tmp[2]) | int(d.tmp[3])<<8

	ServiceExportController = "istio-serviceexport-controller-election"
	// This holds the legacy name to not conflict with older control plane deployments which are just
	// doing the ingress syncing.
	IngressController = "istio-leader"
	// GatewayStatusController controls the status of gateway.networking.k8s.io objects. For the v1alpha1

	fault "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/fault/v3"
	grpcstats "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/grpc_stats/v3"
	grpcweb "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/grpc_web/v3"
	router "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/router/v3"

    protected static final String ACCESS_CONTROL_ALLOW_ORIGIN = "Access-Control-Allow-Origin";

    protected static final String ACCESS_CONTROL_ALLOW_HEADERS = "Access-Control-Allow-Headers";

    protected static final String ACCESS_CONTROL_ALLOW_METHODS = "Access-Control-Allow-Methods";

    protected static final String ACCESS_CONTROL_ALLOW_PRIVATE_NETWORK = "Access-Control-Allow-Private-Network";

	# Prepares the machine for serving a control plane
	kubeadm join phase control-plane-prepare all
`)

// NewControlPlanePreparePhase creates a kubeadm workflow phase that implements the preparation of the node to serve a control plane
func NewControlPlanePreparePhase() workflow.Phase {
	return workflow.Phase{
		Name:    "control-plane-prepare",
		Short:   "Prepare the machine for serving a control plane",
		Example: controlPlanePrepareExample,

func (t *worklist) propagate(block *Block) {
	switch block.Kind {
	case BlockExit, BlockRet, BlockRetJmp, BlockInvalid:
		// control flow ends, do nothing then
		break
	case BlockDefer:
		// we know nothing about control flow, add all branch destinations
		t.edges = append(t.edges, block.Succs...)
	case BlockFirst:
		fallthrough // always takes the first branch
	case BlockPlain:

var podKind = v1.SchemeGroupVersion.WithKind("Pod")

// StatefulSetController controls statefulsets.
type StatefulSetController struct {
	// client interface
	kubeClient clientset.Interface
	// control returns an interface capable of syncing a stateful set.
	// Abstracted out for testing.
	control StatefulSetControlInterface
	// podControl is used for patching pods.
	podControl controller.PodControlInterface

    tf_executor.graph {
      %control = tf_executor.island {
        "tf.StatefulPartitionedCall"(%arg0) <{config = "", config_proto = "", executor_type = "", f = @partitioned}> : (tensor<*x!tf_type.resource>) -> ()
        tf_executor.yield
      }
      tf_executor.fetch %control : !tf_executor.control
    }
    return
  }

	"regexp"
	"strings"
	"testing"

	cluster "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
	envoycore "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	listener "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
	route "github.com/envoyproxy/go-control-plane/envoy/config/route/v3"
	tls "github.com/envoyproxy/go-control-plane/envoy/extensions/transport_sockets/tls/v3"
	"github.com/google/go-cmp/cmp"