type Args struct {
	Address               string
	NydusdConfigPath      string
	SnapshotterConfigPath string
	RootDir               string
	NydusdPath            string
	NydusImagePath        string
	NydusOverlayFSPath    string
	DaemonMode            string
	FsDriver              string
	LogLevel              string
	LogToStdout           bool
	LogToStdoutCount      int
	PrintVersion          bool
}

type Flags struct {
	Args *Args
	F    []cli.Flag
}