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