105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/ghodss/yaml"
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"k8s.io/utils/exec"
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)
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// DiffProgram finds and run the diff program. The value of
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// KUBERNETES_EXTERNAL_DIFF environment variable will be used a diff
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// program. By default, `diff(1)` will be used.
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type DiffProgram struct {
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Exec exec.Interface
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Stdout io.Writer
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Stderr io.Writer
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}
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func (d *DiffProgram) getCommand(args ...string) exec.Cmd {
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diff := ""
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if envDiff := os.Getenv("KUBERNETES_EXTERNAL_DIFF"); envDiff != "" {
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diff = envDiff
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} else {
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diff = "diff"
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args = append([]string{"-u", "-N"}, args...)
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}
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cmd := d.Exec.Command(diff, args...)
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cmd.SetStdout(d.Stdout)
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cmd.SetStderr(d.Stderr)
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return cmd
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}
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// Run runs the detected diff program. `from` and `to` are the directory to diff.
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func (d *DiffProgram) Run(from, to string) error {
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d.getCommand(from, to).Run() // Ignore diff return code
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return nil
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}
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// Printer is used to print an object.
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type Printer struct{}
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// Print the object inside the writer w.
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func (p *Printer) Print(obj interface{}, w io.Writer) error {
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if obj == nil {
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return nil
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}
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data, err := yaml.Marshal(obj)
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if err != nil {
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return err
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}
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_, err = w.Write(data)
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return err
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}
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// Directory creates a new temp directory, and allows to easily create new files.
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type Directory struct {
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Name string
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}
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// CreateDirectory does create the actual disk directory, and return a
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// new representation of it.
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func CreateDirectory(prefix string) (*Directory, error) {
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name, err := ioutil.TempDir("", prefix+"-")
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if err != nil {
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return nil, err
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}
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return &Directory{
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Name: name,
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}, nil
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}
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// NewFile creates a new file in the directory.
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func (d *Directory) NewFile(name string) (*os.File, error) {
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return os.OpenFile(filepath.Join(d.Name, name), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0700)
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}
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// Delete removes the directory recursively.
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func (d *Directory) Delete() error {
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return os.RemoveAll(d.Name)
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}
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