func unpackImage()

in container_images/registry-image-forked/commands/unpack.go [23:71]

• 36 lines of code
• 8 McCabe index (conditional complexity)

func unpackImage(dest string, img v1.Image, debug bool, out io.Writer) error {
	layers, err := img.Layers()
	if err != nil {
		return err
	}

	chown := os.Getuid() == 0

	if debug {
		out = ioutil.Discard
	}

	progress := mpb.New(mpb.WithOutput(out))

	bars := make([]*mpb.Bar, len(layers))

	for i, layer := range layers {
		size, err := layer.Size()
		if err != nil {
			return err
		}

		digest, err := layer.Digest()
		if err != nil {
			return err
		}

		bars[i] = progress.AddBar(
			size,
			mpb.PrependDecorators(decor.Name(color.HiBlackString(digest.Hex[0:12]))),
			mpb.AppendDecorators(decor.CountersKibiByte("%.1f/%.1f")),
		)
	}

	// iterate over layers in reverse order; no need to write things files that
	// are modified by later layers anyway
	for i, layer := range layers {
		logrus.Debugf("extracting layer %d of %d", i+1, len(layers))

		err := extractLayer(dest, layer, bars[i], chown)
		if err != nil {
			return err
		}
	}

	progress.Wait()

	return nil
}