system

type Service interface {
	// ID is the service id.
	ID(*userdata.UserData) string
	// PreFunc is invoked before a command is executed.
	PreFunc(*userdata.UserData) error
	// Start
	Start(*userdata.UserData) error
	// PostFunc is invoked after a command is executed.
	PostFunc(*userdata.UserData) error
	// ConditionFunc describes the conditions under which a service should
	// start.
	ConditionFunc(*userdata.UserData) conditions.ConditionFunc
}