mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
// +build ignore
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// Simple tool to create an archive stream from an old and new directory
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//
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// By default it will stream the comparison of two temporary directories with junk files
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package main
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import (
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"github.com/docker/docker/pkg/archive"
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"github.com/sirupsen/logrus"
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)
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var (
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flDebug = flag.Bool("D", false, "debugging output")
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flNewDir = flag.String("newdir", "", "")
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flOldDir = flag.String("olddir", "", "")
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log = logrus.New()
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)
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func main() {
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flag.Usage = func() {
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fmt.Println("Produce a tar from comparing two directory paths. By default a demo tar is created of around 200 files (including hardlinks)")
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fmt.Printf("%s [OPTIONS]\n", os.Args[0])
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flag.PrintDefaults()
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}
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flag.Parse()
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log.Out = os.Stderr
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if (len(os.Getenv("DEBUG")) > 0) || *flDebug {
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logrus.SetLevel(logrus.DebugLevel)
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}
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var newDir, oldDir string
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if len(*flNewDir) == 0 {
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var err error
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newDir, err = ioutil.TempDir("", "docker-test-newDir")
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if err != nil {
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log.Fatal(err)
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}
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defer os.RemoveAll(newDir)
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if _, err := prepareUntarSourceDirectory(100, newDir, true); err != nil {
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log.Fatal(err)
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}
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} else {
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newDir = *flNewDir
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}
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if len(*flOldDir) == 0 {
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oldDir, err := ioutil.TempDir("", "docker-test-oldDir")
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if err != nil {
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log.Fatal(err)
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}
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defer os.RemoveAll(oldDir)
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} else {
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oldDir = *flOldDir
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}
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changes, err := archive.ChangesDirs(newDir, oldDir)
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if err != nil {
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log.Fatal(err)
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}
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a, err := archive.ExportChanges(newDir, changes)
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if err != nil {
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log.Fatal(err)
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}
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defer a.Close()
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i, err := io.Copy(os.Stdout, a)
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if err != nil && err != io.EOF {
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log.Fatal(err)
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}
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fmt.Fprintf(os.Stderr, "wrote archive of %d bytes", i)
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}
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func prepareUntarSourceDirectory(numberOfFiles int, targetPath string, makeLinks bool) (int, error) {
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fileData := []byte("fooo")
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for n := 0; n < numberOfFiles; n++ {
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fileName := fmt.Sprintf("file-%d", n)
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if err := ioutil.WriteFile(path.Join(targetPath, fileName), fileData, 0700); err != nil {
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return 0, err
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}
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if makeLinks {
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if err := os.Link(path.Join(targetPath, fileName), path.Join(targetPath, fileName+"-link")); err != nil {
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return 0, err
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}
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}
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}
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totalSize := numberOfFiles * len(fileData)
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return totalSize, nil
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}
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