func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
if tarArchive == nil {
return fmt.Errorf("Empty archive")
}
if options == nil {
options = &archive.TarOptions{}
}
if options.Excludes == nil {
options.Excludes = []string{}
}
var (
buf bytes.Buffer
enc = json.NewEncoder(&buf)
)
if err := enc.Encode(options); err != nil {
return fmt.Errorf("Untar json encode: %v", err)
}
if _, err := os.Stat(dest); os.IsNotExist(err) {
if err := os.MkdirAll(dest, 0777); err != nil {
return err
}
}
dest = filepath.Clean(dest)
decompressedArchive, err := archive.DecompressStream(tarArchive)
if err != nil {
return err
}
defer decompressedArchive.Close()
cmd := reexec.Command("docker-untar", dest, buf.String())
cmd.Stdin = decompressedArchive
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("Untar %s %s", err, out)
}
return nil
}
