Add version flag to operator binary

Refer submariner-io/enhancements#204

Fixes submariner-io#2751

Signed-off-by: Vishal Thapar <[email protected]>

main.go

@@ -35,6 +35,7 @@ import (
 	"github.com/submariner-io/submariner-operator/pkg/crd"
 	"github.com/submariner-io/submariner-operator/pkg/gateway"
 	"github.com/submariner-io/submariner-operator/pkg/lighthouse"
+	"github.com/submariner-io/submariner-operator/pkg/names"
 	submv1 "github.com/submariner-io/submariner/pkg/apis/submariner.io/v1"
 	apiextensions "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
 	apiruntime "k8s.io/apimachinery/pkg/runtime"
@@ -58,20 +59,21 @@ var (
 )
 
 var (
-	scheme  = apiruntime.NewScheme()
-	log     = logf.Log.WithName("cmd")
-	help    = false
-	version = "devel"
+	scheme      = apiruntime.NewScheme()
+	log         = logf.Log.WithName("cmd")
+	help        = false
+	version     = "devel"
+	showVersion = false
 )
 
 func printVersion() {
 	log.Info(fmt.Sprintf("Go Version: %s", runtime.Version()))
 	log.Info(fmt.Sprintf("Go OS/Arch: %s/%s", runtime.GOOS, runtime.GOARCH))
-	log.Info(fmt.Sprintf("Submariner operator version: %v", version))
 }
 
 func init() {
 	flag.BoolVar(&help, "help", help, "Print usage options")
+	flag.BoolVar(&showVersion, "version", showVersion, "Show version")
 }
 
 //nolint:gocyclo // No further refactors necessary
@@ -91,6 +93,12 @@ func main() {
 		return
 	}
 
+	fmt.Fprintf(os.Stderr, "%s version: %s\n", names.OperatorComponent, version)
+
+	if showVersion {
+		return
+	}
+
 	kzerolog.InitK8sLogging()
 	log.Info("Starting submariner-operator")