supply

type Command interface {
	Execute(dir string, stdout io.Writer, stderr io.Writer, program string, args ...string) error
	Output(dir string, program string, args ...string) (string, error)
}

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

type Manifest interface {
	AllDependencyVersions(depName string) []string
	DefaultVersion(depName string) (libbuildpack.Dependency, error)
	GetEntry(dep libbuildpack.Dependency) (*libbuildpack.ManifestEntry, error)
	IsCached() bool
}

type Stager interface {
	BuildDir() string
	CacheDir() string
	DepDir() string
	DepsIdx() string
	LinkDirectoryInDepDir(destDir, destSubDir string) error
	WriteEnvFile(envVar, envVal string) error
	WriteProfileD(scriptName, scriptContents string) error
}

type Supplier struct {
	Manifest  Manifest
	Installer Installer
	Stager    Stager
	Command   Command
	Log       *libbuildpack.Logger
	Logfile   *os.File
	Registry  *extensions.Registry
	Options   *options.Options
	Context   *extensions.Context // Extension context with PHP version and extensions
}