supply

type Cache interface {
	Metadata() *cache.Metadata
	Restore() error
	Save() error
}

type Command interface {
	Execute(string, io.Writer, io.Writer, string, ...string) error
	Output(string, string, ...string) (string, error)
	Run(*exec.Cmd) error
}

type IndentedWriter struct {
	// contains filtered or unexported fields
}

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

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

type Supplier struct {
	Stager   Stager
	Manifest Manifest
	Log      *libbuildpack.Logger
	Versions Versions
	Cache    Cache
	Command  Command
	// contains filtered or unexported fields
}

type Versions interface {
	Engine() (string, error)
	Version() (string, error)
	JrubyVersion() (string, error)
	RubyEngineVersion() (string, error)
	HasGemVersion(gem string, constraints ...string) (bool, error)
	VersionConstraint(version string, constraints ...string) (bool, error)
	HasWindowsGemfileLock() (bool, error)
	Gemfile() string
}