added a hidden openapi info command

kustomize/go.mod

@@ -10,6 +10,7 @@ require (
 	k8s.io/client-go v0.17.3
 	sigs.k8s.io/kustomize/api v0.6.3
 	sigs.k8s.io/kustomize/cmd/config v0.8.2
+	sigs.k8s.io/kustomize/kyaml v0.9.2
 	sigs.k8s.io/yaml v1.2.0
 )
 
@@ -19,6 +20,8 @@ exclude (
 	sigs.k8s.io/kustomize/cmd/config v0.2.0
 )
 
-replace sigs.k8s.io/kustomize/api v0.6.3 => ../api
-
-replace sigs.k8s.io/kustomize/cmd/config v0.8.2 => ../cmd/config
+replace (
+	sigs.k8s.io/kustomize/api v0.6.3 => ../api
+	sigs.k8s.io/kustomize/cmd/config v0.8.2 => ../cmd/config
+	sigs.k8s.io/kustomize/kyaml v0.9.2 => ../kyaml
+)

kustomize/internal/commands/commands.go

@@ -19,6 +19,7 @@ import (
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/build"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/create"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/edit"
+	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/openapi"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/version"
 )
 
@@ -43,6 +44,7 @@ See https://sigs.k8s.io/kustomize
 		edit.NewCmdEdit(fSys, v, uf),
 		create.NewCmdCreate(fSys, uf),
 		version.NewCmdVersion(stdOut),
+		openapi.NewCmdOpenAPI(stdOut),
 	)
 	configcobra.AddCommands(c, "kustomize")
 

kustomize/internal/commands/openapi/info/info.go

@@ -0,0 +1,28 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package info
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi"
+)
+
+// NewCmdInfo makes a new info command.
+func NewCmdInfo(w io.Writer) *cobra.Command {
+
+	infoCmd := cobra.Command{
+		Use:     "info",
+		Short:   "Prints the `info` field from the kubernetes OpenAPI data",
+		Example: `kustomize openapi info`,
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Fprintln(w, kubernetesapi.Info)
+		},
+		Hidden: true,
+	}
+
+	return &infoCmd
+}

kustomize/internal/commands/openapi/openapi.go

@@ -0,0 +1,27 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package openapi
+
+import (
+	"io"
+
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/cmd/config/configcobra"
+	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/openapi/info"
+)
+
+// NewCmdOpenAPI makes a new openapi command.
+func NewCmdOpenAPI(w io.Writer) *cobra.Command {
+
+	openApiCmd := &cobra.Command{
+		Use:     "openapi",
+		Short:   "Commands for interacting with the OpenAPI data",
+		Example: `kustomize openapi info`,
+	}
+
+	openApiCmd.AddCommand(info.NewCmdInfo(w))
+	configcobra.AddCommands(openApiCmd, "openapi")
+
+	return openApiCmd
+}