Isolated content of pkg/kustomize

pkg/commands/build.go

@@ -0,0 +1,110 @@
+/*
+Copyright 2017 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 commands
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"errors"
+
+	"k8s.io/kubectl/pkg/kustomize/app"
+	"k8s.io/kubectl/pkg/kustomize/constants"
+	kutil "k8s.io/kubectl/pkg/kustomize/util"
+	"k8s.io/kubectl/pkg/kustomize/util/fs"
+	"k8s.io/kubectl/pkg/loader"
+)
+
+type buildOptions struct {
+	kustomizationPath string
+}
+
+// newCmdBuild creates a new build command.
+func newCmdBuild(out, errOut io.Writer, fs fs.FileSystem) *cobra.Command {
+	var o buildOptions
+
+	cmd := &cobra.Command{
+		Use:   "build [path]",
+		Short: "Print current configuration per contents of " + constants.KustomizationFileName,
+		Example: "Use the file somedir/" + constants.KustomizationFileName +
+			" to generate a set of api resources:\nbuild somedir/",
+		Run: func(cmd *cobra.Command, args []string) {
+			err := o.Validate(args)
+			if err != nil {
+				fmt.Fprintf(errOut, "error: %v\n", err)
+				os.Exit(1)
+			}
+			err = o.RunBuild(out, errOut, fs)
+			if err != nil {
+				fmt.Fprintf(errOut, "error: %v\n", err)
+				os.Exit(1)
+			}
+		},
+	}
+	return cmd
+}
+
+// Validate validates build command.
+func (o *buildOptions) Validate(args []string) error {
+	if len(args) > 1 {
+		return errors.New("specify one path to " + constants.KustomizationFileName)
+	}
+	if len(args) == 0 {
+		o.kustomizationPath = "./"
+		return nil
+	}
+	o.kustomizationPath = args[0]
+	return nil
+}
+
+// RunBuild runs build command.
+func (o *buildOptions) RunBuild(out, errOut io.Writer, fs fs.FileSystem) error {
+	l := loader.Init([]loader.SchemeLoader{loader.NewFileLoader(fs)})
+
+	absPath, err := filepath.Abs(o.kustomizationPath)
+	if err != nil {
+		return err
+	}
+
+	rootLoader, err := l.New(absPath)
+	if err != nil {
+		return err
+	}
+
+	application, err := app.New(rootLoader)
+	if err != nil {
+		return err
+	}
+
+	allResources, err := application.Resources()
+
+	if err != nil {
+		return err
+	}
+
+	// Output the objects.
+	res, err := kutil.Encode(allResources)
+	if err != nil {
+		return err
+	}
+	_, err = out.Write(res)
+	return err
+}