Adds feature gates infrastructure

Signed-off-by: Joaquim Moreno Prusi <joaquim@redhat.com>

cmd/core/main.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/gorilla/handlers"
 	helmclient "github.com/operator-framework/helm-operator-plugins/pkg/client"
+	"github.com/spf13/pflag"
 	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -52,6 +53,7 @@ import (
 	"github.com/operator-framework/rukpak/internal/uploadmgr"
 	"github.com/operator-framework/rukpak/internal/util"
 	"github.com/operator-framework/rukpak/internal/version"
+	"github.com/operator-framework/rukpak/pkg/features"
 )
 
 var (
@@ -99,7 +101,10 @@ func main() {
 		Development: true,
 	}
 	opts.BindFlags(flag.CommandLine)
-	flag.Parse()
+
+	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
+	features.RukpakFeatureGate.AddFlag(pflag.CommandLine)
+	pflag.Parse()
 
 	if rukpakVersion {
 		fmt.Println(version.String())

go.mod

@@ -16,6 +16,7 @@ require (
 	github.com/operator-framework/helm-operator-plugins v0.0.11
 	github.com/operator-framework/operator-registry v1.28.0
 	github.com/spf13/cobra v1.7.0
+	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.8.4
 	golang.org/x/crypto v0.13.0
 	golang.org/x/sync v0.3.0
@@ -25,6 +26,7 @@ require (
 	k8s.io/apimachinery v0.26.1
 	k8s.io/cli-runtime v0.26.1
 	k8s.io/client-go v0.26.1
+	k8s.io/component-base v0.26.1
 	k8s.io/utils v0.0.0-20221128185143-99ec85e7a448
 	sigs.k8s.io/controller-runtime v0.14.4
 	sigs.k8s.io/yaml v1.3.0
@@ -149,7 +151,6 @@ require (
 	github.com/sirupsen/logrus v1.9.2 // indirect
 	github.com/skeema/knownhosts v1.2.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stoewer/go-strcase v1.2.0 // indirect
 	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
@@ -189,7 +190,6 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/apiserver v0.26.1 // indirect
-	k8s.io/component-base v0.26.1 // indirect
 	k8s.io/klog/v2 v2.80.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 // indirect
 	k8s.io/kubectl v0.26.1 // indirect

pkg/features/features.go

@@ -0,0 +1,22 @@
+package features
+
+import (
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/component-base/featuregate"
+)
+
+const (
+// Add new feature gates constants (strings)
+// Ex: SomeFeature featuregate.Feature = "SomeFeature"
+)
+
+var rukpakFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
+	// Add new feature gate definitions
+	// Ex: SomeFeature: {...}
+}
+
+var RukpakFeatureGate featuregate.MutableFeatureGate = featuregate.NewFeatureGate()
+
+func init() {
+	utilruntime.Must(RukpakFeatureGate.Add(rukpakFeatureGates))
+}