Isolated content of pkg/kustomize

pkg/commands/diff.go

@@ -0,0 +1,130 @@
+/*
+Copyright 2018 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 (
+	"errors"
+	"io"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"k8s.io/kubectl/pkg/kustomize/app"
+	"k8s.io/kubectl/pkg/kustomize/constants"
+	"k8s.io/kubectl/pkg/kustomize/util"
+	"k8s.io/kubectl/pkg/kustomize/util/fs"
+	"k8s.io/kubectl/pkg/loader"
+	"k8s.io/utils/exec"
+)
+
+type diffOptions struct {
+	kustomizationPath string
+}
+
+// newCmdDiff makes the diff command.
+func newCmdDiff(out, errOut io.Writer, fs fs.FileSystem) *cobra.Command {
+	var o diffOptions
+
+	cmd := &cobra.Command{
+		Use:     "diff",
+		Short:   "diff between transformed resources and untransformed resources",
+		Long:    "diff between transformed resources and untransformed resources and the subpackages are all transformed.",
+		Example: `diff -f .`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			err := o.Validate(cmd, args)
+			if err != nil {
+				return err
+			}
+			err = o.Complete(cmd, args)
+			if err != nil {
+				return err
+			}
+			return o.RunDiff(out, errOut, fs)
+		},
+	}
+
+	cmd.Flags().StringVarP(
+		&o.kustomizationPath,
+		"filename",
+		"f",
+		"",
+		"Specify a directory containing "+constants.KustomizationFileName)
+	cmd.MarkFlagRequired("filename")
+	return cmd
+}
+
+// Validate validates diff command.
+func (o *diffOptions) Validate(cmd *cobra.Command, args []string) error {
+	if len(args) > 0 {
+		return errors.New("The diff command takes no arguments.")
+	}
+	return nil
+}
+
+// Complete completes diff command.
+func (o *diffOptions) Complete(cmd *cobra.Command, args []string) error {
+	return nil
+}
+
+// RunDiff gets the differences between Application.Resources() and Application.RawResources().
+func (o *diffOptions) RunDiff(out, errOut io.Writer, fs fs.FileSystem) error {
+	printer := util.Printer{}
+	diff := util.DiffProgram{
+		Exec:   exec.New(),
+		Stdout: out,
+		Stderr: errOut,
+	}
+
+	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
+	}
+	resources, err := application.Resources()
+	if err != nil {
+		return err
+	}
+	rawResources, err := application.RawResources()
+	if err != nil {
+		return err
+	}
+
+	transformedDir, err := util.WriteToDir(resources, "transformed", printer)
+	if err != nil {
+		return err
+	}
+	defer transformedDir.Delete()
+
+	noopDir, err := util.WriteToDir(rawResources, "noop", printer)
+	if err != nil {
+		return err
+	}
+	defer noopDir.Delete()
+
+	return diff.Run(noopDir.Name, transformedDir.Name)
+}