Add feature flag for management policies

Signed-off-by: Hasan Turken <turkenh@gmail.com>

Author: turkenh

cmd/provider/main.go

@@ -57,6 +57,8 @@ func main() {
 
 		namespace                  = app.Flag("namespace", "Namespace used to set as default scope in default secret store config.").Default("crossplane-system").Envar("POD_NAMESPACE").String()
 		enableExternalSecretStores = app.Flag("enable-external-secret-stores", "Enable support for ExternalSecretStores.").Default("false").Envar("ENABLE_EXTERNAL_SECRET_STORES").Bool()
+		enableManagementPolicies   = app.Flag("enable-management-policies", "Enable support for Management Policies.").Default("false").Envar("ENABLE_MANAGEMENT_POLICIES").Bool()
+
 		essTLSCertsPath            = app.Flag("ess-tls-cert-dir", "Path of ESS TLS certificates.").Envar("ESS_TLS_CERTS_DIR").String()
 	)
 	kingpin.MustParse(app.Parse(os.Args[1:]))
@@ -128,6 +130,11 @@ func main() {
 		})), "cannot create default store config")
 	}
 
+	if *enableManagementPolicies {
+		o.Features.Enable(features.EnableAlphaManagementPolicies)
+		log.Info("Alpha feature enabled", "flag", features.EnableAlphaManagementPolicies)
+	}
+
 	kingpin.FatalIfError(gcp.Setup(mgr, o), "Cannot setup GCP controllers")
 	kingpin.FatalIfError(mgr.Start(ctrl.SetupSignalHandler()), "Cannot start controller manager")
 }

pkg/features/features.go

@@ -24,4 +24,9 @@ const (
 	// External Secret Stores. See the below design for more details.
 	// https://github.com/crossplane/crossplane/blob/390ddd/design/design-doc-external-secret-stores.md
 	EnableAlphaExternalSecretStores feature.Flag = "EnableAlphaExternalSecretStores"
+
+	// EnableAlphaManagementPolicies enables alpha support for
+	// Management Policies. See the below design for more details.
+	// https://github.com/crossplane/crossplane/blob/master/design/design-doc-observe-only-resources.md
+	EnableAlphaManagementPolicies feature.Flag = "EnableAlphaManagementPolicies"
 )