add kustomize as a subcommand in kubectl

build/visible_to/BUILD

@@ -193,6 +193,7 @@ package_group(
         "//pkg/kubectl/cmd/expose",
         "//pkg/kubectl/cmd/get",
         "//pkg/kubectl/cmd/help",
+        "//pkg/kubectl/cmd/kustomize",
         "//pkg/kubectl/cmd/label",
         "//pkg/kubectl/cmd/logs",
         "//pkg/kubectl/cmd/options",

pkg/kubectl/cmd/BUILD

@@ -38,6 +38,7 @@ go_library(
         "//pkg/kubectl/cmd/explain:go_default_library",
         "//pkg/kubectl/cmd/expose:go_default_library",
         "//pkg/kubectl/cmd/get:go_default_library",
+        "//pkg/kubectl/cmd/kustomize:go_default_library",
         "//pkg/kubectl/cmd/label:go_default_library",
         "//pkg/kubectl/cmd/logs:go_default_library",
         "//pkg/kubectl/cmd/options:go_default_library",
@@ -116,6 +117,7 @@ filegroup(
         "//pkg/kubectl/cmd/expose:all-srcs",
         "//pkg/kubectl/cmd/get:all-srcs",
         "//pkg/kubectl/cmd/help:all-srcs",
+        "//pkg/kubectl/cmd/kustomize:all-srcs",
         "//pkg/kubectl/cmd/label:all-srcs",
         "//pkg/kubectl/cmd/logs:all-srcs",
         "//pkg/kubectl/cmd/options:all-srcs",

pkg/kubectl/cmd/cmd.go

@@ -73,6 +73,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubectl/util/templates"
 
 	"k8s.io/cli-runtime/pkg/genericclioptions"
+	"k8s.io/kubernetes/pkg/kubectl/cmd/kustomize"
 )
 
 const (
@@ -521,6 +522,7 @@ func NewKubectlCommand(in io.Reader, out, err io.Writer) *cobra.Command {
 				replace.NewCmdReplace(f, ioStreams),
 				wait.NewCmdWait(f, ioStreams),
 				convert.NewCmdConvert(f, ioStreams),
+				kustomize.NewCmdKustomize(ioStreams),
 			},
 		},
 		{

pkg/kubectl/cmd/kustomize/BUILD

@@ -0,0 +1,36 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["kustomize.go"],
+    importpath = "k8s.io/kubernetes/pkg/kubectl/cmd/kustomize",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//pkg/kubectl/util/i18n:go_default_library",
+        "//pkg/kubectl/util/templates:go_default_library",
+        "//staging/src/k8s.io/cli-runtime/pkg/genericclioptions:go_default_library",
+        "//staging/src/k8s.io/cli-runtime/pkg/kustomize:go_default_library",
+        "//vendor/github.com/spf13/cobra:go_default_library",
+        "//vendor/sigs.k8s.io/kustomize/pkg/fs:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["kustomize_test.go"],
+    embed = [":go_default_library"],
+)

pkg/kubectl/cmd/kustomize/kustomize.go

@@ -0,0 +1,92 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kustomize
+
+import (
+	"errors"
+	"github.com/spf13/cobra"
+
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+	"k8s.io/cli-runtime/pkg/kustomize"
+	"k8s.io/kubernetes/pkg/kubectl/util/i18n"
+	"k8s.io/kubernetes/pkg/kubectl/util/templates"
+	"sigs.k8s.io/kustomize/pkg/fs"
+)
+
+type kustomizeOptions struct {
+	kustomizationDir string
+}
+
+var (
+	kustomizeLong = templates.LongDesc(i18n.T(`
+Print a set of API resources generated from instructions in a kustomization.yaml file.
+
+The argument must be the path to the directory containing
+the file, or a git repository
+URL with a path suffix specifying same with respect to the
+repository root.
+
+  kubectl kustomize somedir
+	`))
+
+	kustomizeExample = templates.Examples(i18n.T(`
+# Use the current working directory
+  kubectl kustomize .
+
+# Use some shared configuration directory
+  kubectl kustomize /home/configuration/production
+
+# Use a URL
+  kubectl kustomize github.com/kubernetes-sigs/kustomize.git/examples/helloWorld?ref=v1.0.6
+`))
+)
+
+// NewCmdKustomize returns a kustomize command
+func NewCmdKustomize(streams genericclioptions.IOStreams) *cobra.Command {
+	var o kustomizeOptions
+
+	cmd := &cobra.Command{
+		Use:     "kustomize <dir>",
+		Short:   i18n.T("Build a kustomization target from a directory or a remote url."),
+		Long:    kustomizeLong,
+		Example: kustomizeExample,
+
+		RunE: func(cmd *cobra.Command, args []string) error {
+			err := o.Validate(args)
+			if err != nil {
+				return err
+			}
+			return kustomize.RunKustomizeBuild(streams.Out, fs.MakeRealFS(), o.kustomizationDir)
+		},
+	}
+
+	return cmd
+}
+
+// Validate validates build command.
+func (o *kustomizeOptions) Validate(args []string) error {
+	if len(args) > 1 {
+		return errors.New("specify one path to a kustomization directory")
+	}
+	if len(args) == 0 {
+		o.kustomizationDir = "./"
+	} else {
+		o.kustomizationDir = args[0]
+	}
+
+	return nil
+}

pkg/kubectl/cmd/kustomize/kustomize_test.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kustomize
+
+import (
+	"testing"
+)
+
+func TestValidate(t *testing.T) {
+	var cases = []struct {
+		name  string
+		args  []string
+		path  string
+		erMsg string
+	}{
+		{"noargs", []string{}, "./", ""},
+		{"file", []string{"beans"}, "beans", ""},
+		{"path", []string{"a/b/c"}, "a/b/c", ""},
+		{"path", []string{"too", "many"},
+			"", "specify one path to a kustomization directory"},
+	}
+	for _, mycase := range cases {
+		opts := kustomizeOptions{}
+		e := opts.Validate(mycase.args)
+		if len(mycase.erMsg) > 0 {
+			if e == nil {
+				t.Errorf("%s: Expected an error %v", mycase.name, mycase.erMsg)
+			}
+			if e.Error() != mycase.erMsg {
+				t.Errorf("%s: Expected error %s, but got %v", mycase.name, mycase.erMsg, e)
+			}
+			continue
+		}
+		if e != nil {
+			t.Errorf("%s: unknown error %v", mycase.name, e)
+			continue
+		}
+		if opts.kustomizationDir != mycase.path {
+			t.Errorf("%s: expected path '%s', got '%s'", mycase.name, mycase.path, opts.kustomizationDir)
+		}
+	}
+}