link

type Info struct {
	Name  string
	Share *Share
	Links []packfile.Link
	App   bool
}

type Layer interface {
	sync.Node
	Streamer
	Info() Info
	Locks(target Layer) bool
	Forward(targets []Layer)
	Backward(targets []Layer)
}

type Require struct {
	Name     string                 `toml:"name"`
	Metadata map[string]interface{} `toml:"metadata"`
}

type Share struct {
	LayerDir string
	Metadata metadata.Metadata
}

type Streamer interface {
	Stdout() io.Writer
	Stderr() io.Writer
	Stream(out, err io.Writer) error
	Close() error
}