const (
	StateFileLock     = "lock"
	StateFileChildPID = "child_pid" // decimal pid number text
	StateFileAPISock  = "api.sock"  // REST API Socket
)

type Opt struct {
	PipeFDEnvKey     string               // needs to be set
	StateDir         string               // directory needs to be precreated
	StateDirEnvKey   string               // optional env key to propagate StateDir value
	NetworkDriver    network.ParentDriver // nil for HostNetwork
	PortDriver       port.ParentDriver    // nil for --port-driver=none
	PublishPorts     []port.Spec
	CreatePIDNS      bool
	CreateCgroupNS   bool
	CreateUTSNS      bool
	CreateIPCNS      bool
	ParentEUIDEnvKey string // optional env key to propagate geteuid() value
	ParentEGIDEnvKey string // optional env key to propagate getegid() value
	Propagation      string
}