Updates operator to pass feature gate flags

This change updates the operator to support passing feature gates as flags to the
operands.

It only enables this for the MachineSet container.

Author: theobarberbany

pkg/operator/config.go

@@ -24,6 +24,7 @@ type OperatorConfig struct {
 	Controllers     Controllers
 	Proxy           *configv1.Proxy
 	PlatformType    configv1.PlatformType
+	Features        map[string]bool
 }
 
 type Controllers struct {

pkg/operator/operator.go

@@ -456,17 +456,28 @@ func (optr *Operator) maoConfigFromInfrastructure() (*OperatorConfig, error) {
 		return nil, err
 	}
 
-	// in case the MHC controller is disabled, leave its image empty
-	mhcImage := machineAPIOperatorImage
 	featureGates, err := optr.featureGateAccessor.CurrentFeatureGates()
 	if err != nil {
 		return nil, err
 	}
+
+	// in case the MHC controller is disabled, leave its image empty
+	mhcImage := machineAPIOperatorImage
 	if featureGates.Enabled(apifeatures.FeatureGateMachineAPIOperatorDisableMachineHealthCheckController) {
 		klog.V(2).Info("Disabling MHC controller")
 		mhcImage = ""
 	}
 
+	// Given we only support the MachineAPIMigration featuregate being passed by
+	// flags, it shold be the only thing populated our map (and therefore passed
+	// as args)
+	features := map[string]bool{
+		string(apifeatures.FeatureGateMachineAPIMigration): featureGates.Enabled(apifeatures.FeatureGateMachineAPIMigration),
+	}
+	if features[string(apifeatures.FeatureGateMachineAPIMigration)] {
+		klog.V(2).Info("Enabling MachineAPIMigration for provider controller and machinesets")
+	}
+
 	return &OperatorConfig{
 		TargetNamespace: optr.namespace,
 		Proxy:           clusterWideProxy,
@@ -479,5 +490,6 @@ func (optr *Operator) maoConfigFromInfrastructure() (*OperatorConfig, error) {
 			TerminationHandler: terminationHandlerImage,
 		},
 		PlatformType: provider,
+		Features:     features,
 	}, nil
 }