Add flag to configure the registration socket path

cr https://code.amazon.com/reviews/CR-30179075

cmd/csi-node-driver-registrar/main.go

@@ -46,6 +46,7 @@ const (
 var (
 	connectionTimeout       = flag.Duration("connection-timeout", 0, "The --connection-timeout flag is deprecated")
 	csiAddress              = flag.String("csi-address", "/run/csi/socket", "Path of the CSI driver socket that the node-driver-registrar will connect to.")
+	pluginRegistrationPath  = flag.String("plugin-registration-path", "/registration", "Path of the registration socket on the Kubernetes host machine.")
 	kubeletRegistrationPath = flag.String("kubelet-registration-path", "", "Path of the CSI driver socket on the Kubernetes host machine.")
 	showVersion             = flag.Bool("version", false, "Show version.")
 	version                 = "unknown"

cmd/csi-node-driver-registrar/node_register.go

@@ -36,7 +36,7 @@ func nodeRegister(
 	// as gRPC server which replies to registration requests initiated by kubelet's
 	// pluginswatcher infrastructure. Node labeling is done by kubelet's csi code.
 	registrar := newRegistrationServer(csiDriverName, *kubeletRegistrationPath, supportedVersions)
-	socketPath := fmt.Sprintf("/registration/%s-reg.sock", csiDriverName)
+	socketPath := fmt.Sprintf("%s/%s-reg.sock", *pluginRegistrationPath, csiDriverName)
 	if err := util.CleanupSocketFile(socketPath); err != nil {
 		klog.Errorf("%+v", err)
 		os.Exit(1)