Refactor kustomize config command structure

- Create cfg, fn, live parent commands

cmd/config/configcobra/live.go

@@ -0,0 +1,89 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package configcobra
+
+import (
+	"flag"
+
+	"github.com/spf13/cobra"
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+	"k8s.io/client-go/discovery"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/kubectl/pkg/cmd/util"
+	"sigs.k8s.io/cli-utils/cmd/apply"
+	"sigs.k8s.io/cli-utils/cmd/destroy"
+	"sigs.k8s.io/cli-utils/cmd/diff"
+	"sigs.k8s.io/cli-utils/cmd/initcmd"
+	"sigs.k8s.io/cli-utils/cmd/preview"
+	"sigs.k8s.io/cli-utils/pkg/util/factory"
+)
+
+func GetLive(name string) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "live",
+		Short: "Commands for reading and writing resources to a cluster.",
+	}
+	ioStreams := genericclioptions.IOStreams{
+		In:     cmd.InOrStdin(),
+		Out:    cmd.OutOrStdout(),
+		ErrOut: cmd.ErrOrStderr(),
+	}
+
+	flags := cmd.PersistentFlags()
+	kubeConfigFlags := genericclioptions.NewConfigFlags(true).WithDeprecatedPasswordFlag()
+	kubeConfigFlags.AddFlags(flags)
+	userAgentKubeConfigFlags := &UserAgentKubeConfigFlags{
+		Delegate:  kubeConfigFlags,
+		UserAgent: "kustomize",
+	}
+	matchVersionKubeConfigFlags := util.NewMatchVersionFlags(
+		&factory.CachingRESTClientGetter{
+			Delegate: userAgentKubeConfigFlags,
+		},
+	)
+	matchVersionKubeConfigFlags.AddFlags(cmd.PersistentFlags())
+	cmd.PersistentFlags().AddGoFlagSet(flag.CommandLine)
+	f := util.NewFactory(matchVersionKubeConfigFlags)
+
+	applyCmd := apply.ApplyCommand(f, ioStreams)
+	_ = applyCmd.Flags().MarkHidden("no-prune")
+
+	cmd.AddCommand(
+		applyCmd,
+		initcmd.NewCmdInit(ioStreams),
+		preview.NewCmdPreview(f, ioStreams),
+		diff.NewCmdDiff(f, ioStreams),
+		destroy.NewCmdDestroy(f, ioStreams))
+	return cmd
+}
+
+type UserAgentKubeConfigFlags struct {
+	Delegate  genericclioptions.RESTClientGetter
+	UserAgent string
+}
+
+func (u *UserAgentKubeConfigFlags) ToRESTConfig() (*rest.Config, error) {
+	clientConfig, err := u.Delegate.ToRESTConfig()
+	if err != nil {
+		return nil, err
+	}
+	if u.UserAgent != "" {
+		clientConfig.UserAgent = u.UserAgent
+	}
+	return clientConfig, nil
+}
+
+func (u *UserAgentKubeConfigFlags) ToDiscoveryClient() (discovery.CachedDiscoveryInterface, error) {
+	return u.Delegate.ToDiscoveryClient()
+}
+
+func (u *UserAgentKubeConfigFlags) ToRESTMapper() (meta.RESTMapper, error) {
+	return u.Delegate.ToRESTMapper()
+}
+
+func (u *UserAgentKubeConfigFlags) ToRawKubeConfigLoader() clientcmd.ClientConfig {
+	return u.Delegate.ToRawKubeConfigLoader()
+}