func main() {
sw := ui.NewSpinningWriter("", ioutil.Discard)
defer sw.Close()
if _, err := io.Copy(sw, os.Stdin); err != nil {
fmt.Println(err)
}
}
// Write ACI to `, return its hash. If packlist file is nil, writes
// flat ACI (and manifest omits the dependencies).
func (img *Image) writeACI(w io.Writer, packlist *os.File) (*types.Hash, error) {
var sink io.WriteCloser
var faucet io.Reader
sw := ui.NewSpinningWriter("Writing ACI", w)
defer sw.Close()
sink = sw
tarArgs := []string{"-C", img.Path(), "-c", "--null", "-f", "-"}
if packlist != nil {
img.ui.Debug("Writing an incremental ACI")
tarArgs = append(tarArgs, "-n", "-T", "-")
} else {
img.ui.Debug("Writing a flat ACI")
// no packlist -> flat ACI
manifest := img.Manifest
manifest.Dependencies = nil
manifest.PathWhitelist = nil
manifestF, err := ioutil.TempFile(img.Path(), "manifest.flat.")
if err != nil {
return nil, errors.Trace(err)
}
defer os.Remove(manifestF.Name())
if manifestB, err := json.Marshal(manifest); err != nil {
manifestF.Close()
return nil, errors.Trace(err)
} else {
_, err := manifestF.Write(manifestB)
manifestF.Close()
if err != nil {
return nil, errors.Trace(err)
}
}
manifestN := filepath.Base(manifestF.Name())
tarArgs = append(tarArgs, "-s", "/^"+manifestN+"$/manifest/", manifestN, "rootfs")
}
tar := run.Command("tar", tarArgs...).ReadFrom(packlist)
if tarPipe, err := tar.StdoutPipe(); err != nil {
return nil, errors.Trace(err)
} else {
faucet = tarPipe
}
hash := sha512.New()
faucet = io.TeeReader(faucet, hash)
var compressor *run.Cmd = nil
if compression := Config().GetString("images.aci.compression", "no"); compression != "none" {
switch compression {
case "xz":
compressor = run.Command("xz", "-z", "-c")
case "bzip2":
compressor = run.Command("bzip2", "-z", "-c")
case "gz":
case "gzip":
compressor = run.Command("gzip", "-c")
default:
return nil, errors.Errorf("Invalid setting images.aci.compression=%#v (allowed values: xz, bzip2, gzip, none)", compression)
}
compressor.Cmd.Stdout = sink
if cin, err := compressor.StdinPipe(); err != nil {
return nil, errors.Trace(err)
} else {
sink = cin
}
}
if err := tar.Start(); err != nil {
return nil, errors.Trace(err)
}
if compressor != nil {
if err := compressor.Start(); err != nil {
tar.Kill()
return nil, errors.Trace(err)
}
}
if _, err := io.Copy(sink, faucet); err != nil {
sink.Close()
tar.Kill()
compressor.Kill()
return nil, errors.Trace(err)
}
if err := tar.Wait(); err != nil {
sink.Close()
compressor.Kill()
return nil, errors.Trace(err)
}
sink.Close()
if err := compressor.Wait(); err != nil {
return nil, errors.Trace(err)
}
if hash, err := types.NewHash(fmt.Sprintf("sha512-%x", hash.Sum(nil))); err != nil {
// CAN'T HAPPEN, srsly
return nil, errors.Trace(err)
} else {
img.ui.Debug("Saved", hash)
return hash, nil
}
}