supply

type Command interface {
	Execute(string, io.Writer, io.Writer, string, ...string) error
	Output(string, string, ...string) (string, error)
}

type Installer interface {
	FetchDependency(libbuildpack.Dependency, string) error
	InstallDependency(libbuildpack.Dependency, string) error
	InstallOnlyVersion(string, string) error
}

type Manifest interface {
	AllDependencyVersions(string) []string
	DefaultVersion(string) (libbuildpack.Dependency, error)
}

type Stager interface {
	BuildDir() string
	CacheDir() string
	DepDir() string
	DepsIdx() string
	LinkDirectoryInDepDir(string, string) error
	AddBinDependencyLink(string, string) error
	WriteEnvFile(string, string) error
	WriteProfileD(string, string) error
	SetStagingEnvironment() error
}

type Supplier struct {
	Stager    Stager
	Manifest  Manifest
	Installer Installer
	Log       *libbuildpack.Logger
	Command   Command
	Config    *config.Config
	Project   *project.Project
}