supply

type Command interface {
	Execute(string, io.Writer, io.Writer, string, ...string) error
	Output(string, string, ...string) (string, error)
	Run(cmd *exec.Cmd) error
	RunWithOutput(cmd *exec.Cmd) ([]byte, error)
}

type Config struct {
	Nginx NginxConfig `yaml:"nginx"`
	Dist  string      `yaml:"dist"`
}

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

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

type NginxConfig struct {
	Version string `yaml:"version"`
}

type Stager interface {
	AddBinDependencyLink(string, string) error
	DepDir() string
	DepsIdx() string
	DepsDir() string
	BuildDir() string
	WriteProfileD(string, string) error
}

type Supplier struct {
	Stager       Stager
	Manifest     Manifest
	Installer    Installer
	Log          *libbuildpack.Logger
	Config       Config
	Command      Command
	VersionLines map[string]string
}