foo.diff

ε !:! ~/go/src/k8s.io/kubernetes $ git diff
diff --git a/cmd/kubeadm/app/cmd/upgrade/diff.go b/cmd/kubeadm/app/cmd/upgrade/diff.go
index c0223fedb9..46404a2901 100644
--- a/cmd/kubeadm/app/cmd/upgrade/diff.go
+++ b/cmd/kubeadm/app/cmd/upgrade/diff.go
@@ -26,6 +26,7 @@ import (
        "github.com/spf13/cobra"
        corev1 "k8s.io/api/core/v1"
        kubeadmapiv1alpha3 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1alpha3"
+       "k8s.io/kubernetes/cmd/kubeadm/app/cmd/options"
        cmdutil "k8s.io/kubernetes/cmd/kubeadm/app/cmd/util"
        "k8s.io/kubernetes/cmd/kubeadm/app/constants"
        "k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane"
@@ -66,7 +67,10 @@ func NewCmdDiff(out io.Writer) *cobra.Command {
        }

        // TODO: Use the generic options.AddConfigFlag method instead
-       cmd.Flags().StringVar(&flags.cfgPath, "config", flags.cfgPath, "Path to kubeadm config file. WARNING: Usage of a configuration file is experimental!")
+       // fs *pflag.FlagSet
+
+       options.AddConfigFlag(cmd.Flags(), &flags.cfgPath)
+       //cmd.Flags().StringVar(&flags.cfgPath, "config", flags.cfgPath, "Path to kubeadm config file. WARNING: Usage of a configuration file is experimental!")
        cmd.Flags().StringVar(&flags.apiServerManifestPath, "api-server-manifest", defaultAPIServerManifestPath, "path to API server manifest")
        cmd.Flags().StringVar(&flags.controllerManagerManifestPath, "controller-manager-manifest", defaultControllerManagerManifestPath, "path to controller manifest")
        cmd.Flags().StringVar(&flags.schedulerManifestPath, "scheduler-manifest", defaultSchedulerManifestPath, "path to scheduler manifest")