Function Append

pkg/crane/append.go:44–82

Append reads a layer from path and appends it the the v1.Image base. If the base image is a Windows base image (i.e., its config.OS is "windows"), the contents of the tarballs will be modified to be suitable for a Windows container image.`,

(base v1.Image, paths ...string)

// "windows"), the contents of the tarballs will be modified to be suitable for
// a Windows container image.`,
func Append(base v1.Image, paths ...string) (v1.Image, error) {
	if base == nil {
		return nil, fmt.Errorf("invalid argument: base")
	}

	win, err := isWindows(base)
	if err != nil {
		return nil, fmt.Errorf("getting base image: %w", err)
	}

	baseMediaType, err := base.MediaType()
	if err != nil {
		return nil, fmt.Errorf("getting base image media type: %w", err)
	}

	layerType := types.DockerLayer
	if baseMediaType == types.OCIManifestSchema1 {
		layerType = types.OCILayer
	}

	layers := make([]v1.Layer, 0, len(paths))
	for _, path := range paths {
		layer, err := getLayer(path, layerType)
		if err != nil {
			return nil, fmt.Errorf("reading layer %q: %w", path, err)
		}

		if win {
			layer, err = windows.Windows(layer)
			if err != nil {
				return nil, fmt.Errorf("converting %q for Windows: %w", path, err)
			}
		}

		layers = append(layers, layer)
	}

	return mutate.AppendLayers(base, layers...)
}

func getLayer(path string, layerType types.MediaType) (v1.Layer, error) {
	f, err := streamFile(path)