Golang FlagSet.NFlag方法代码示例

func main() {
	var flagSet *flag.FlagSet

	gHostLabel, err := os.Hostname()
	if err != nil {
		log.Fatalf("Failed to fetch hostname. Error: %s", err)
	}

	flagSet = flag.NewFlagSet("pslibnet", flag.ExitOnError)
	flagSet.StringVar(&gcliOpts.hostLabel,
		"host-label",
		gHostLabel,
		"label used to identify endpoints homed for this host, default is host name")
	flagSet.StringVar(&gcliOpts.etcdURL,
		"etcd-url",
		"http://127.0.0.1:4001",
		"Etcd cluster url")

	err = flagSet.Parse(os.Args[1:])
	if err != nil {
		log.Fatalf("Failed to parse command. Error: %s", err)
	}

	if flagSet.NFlag() < 1 {
		log.Infof("host-label not specified, using default (%s)", gcliOpts.hostLabel)
	}

	driver := &LibNetDriver{}
	err = driver.Config(nil)
	if err != nil {
		log.Fatalf("libnet driver init failed. Error: %s", err)
	}
	adapter := &PwrStrpAdptr{}
	err = adapter.Init(driver)
	if err != nil {
		log.Fatalf("powerstrip adaper init failed. Error: %s", err)
	}

	// start serving the API requests
	http.HandleFunc("/adapter/", adapter.CallHook)
	err = http.ListenAndServe(":80", nil)
	if err != nil {
		log.Fatalf("Error listening for http requests. Error: %s", err)
	}

	os.Exit(0)
}

func main() {
	var opts cliOpts
	var flagSet *flag.FlagSet

	defHostLabel, err := os.Hostname()
	if err != nil {
		log.Fatalf("Failed to fetch hostname. Error: %s", err)
	}

	// parse rest of the args that require creating state
	flagSet = flag.NewFlagSet("netd", flag.ExitOnError)
	flagSet.BoolVar(&opts.debug,
		"debug",
		false,
		"Show debugging information generated by netplugin")
	flagSet.StringVar(&opts.syslog,
		"syslog",
		"",
		"Log to syslog at proto://ip:port -- use 'kernel' to log via kernel syslog")
	flagSet.BoolVar(&opts.jsonLog,
		"json-log",
		false,
		"Format logs as JSON")
	flagSet.StringVar(&opts.hostLabel,
		"host-label",
		defHostLabel,
		"label used to identify endpoints homed for this host, default is host name. If -config flag is used then host-label must be specified in the the configuration passed.")
	flagSet.StringVar(&opts.pluginMode,
		"plugin-mode",
		"docker",
		"plugin mode docker|kubernetes")
	flagSet.StringVar(&opts.cfgFile,
		"config",
		"",
		"plugin configuration. Use '-' to read configuration from stdin")
	flagSet.StringVar(&opts.vtepIP,
		"vtep-ip",
		"",
		"My VTEP ip address")
	flagSet.StringVar(&opts.ctrlIP,
		"ctrl-ip",
		"",
		"Local ip address to be used for control communication")
	flagSet.StringVar(&opts.vlanIntf,
		"vlan-if",
		"",
		"My VTEP ip address")
	flagSet.BoolVar(&opts.version,
		"version",
		false,
		"Show version")
	flagSet.StringVar(&opts.fwdMode,
		"fwd-mode",
		"bridge",
		"Forwarding Mode")
	flagSet.StringVar(&opts.dbURL,
		"cluster-store",
		"etcd://127.0.0.1:2379",
		"state store url")

	err = flagSet.Parse(os.Args[1:])
	if err != nil {
		log.Fatalf("Failed to parse command. Error: %s", err)
	}

	if opts.version {
		fmt.Printf(version.String())
		os.Exit(0)
	}

	// Make sure we are running as root
	usr, err := user.Current()
	if (err != nil) || (usr.Username != "root") {
		log.Fatalf("This process can only be run as root")
	}

	if opts.debug {
		log.SetLevel(log.DebugLevel)
		os.Setenv("CONTIV_TRACE", "1")
	}

	if opts.jsonLog {
		log.SetFormatter(&log.JSONFormatter{})
	} else {
		log.SetFormatter(&log.TextFormatter{FullTimestamp: true, TimestampFormat: time.StampNano})
	}

	if opts.syslog != "" {
		configureSyslog(opts.syslog)
	}

	if opts.fwdMode != "bridge" && opts.fwdMode != "routing" && opts.fwdMode != "mpls" {
		log.Fatalf("Invalid forwarding mode. Allowed modes are bridge,routing ")
	}

	if flagSet.NFlag() < 1 {
		log.Infof("host-label not specified, using default (%s)", opts.hostLabel)
	}

	// default to using local IP addr
//.........这里部分代码省略.........

func main() {
	var opts cliOpts
	var flagSet *flag.FlagSet

	defHostLabel, err := os.Hostname()
	if err != nil {
		log.Fatalf("Failed to fetch hostname. Error: %s", err)
	}
	// default to using eth1's IP addr
	defVtepIP, _ := netutils.GetInterfaceIP("eth1")
	defVlanIntf := "eth2"

	flagSet = flag.NewFlagSet("netd", flag.ExitOnError)
	flagSet.StringVar(&opts.syslog,
		"syslog",
		"",
		"Log to syslog at proto://ip:port -- use 'kernel' to log via kernel syslog")
	flagSet.BoolVar(&opts.debug,
		"debug",
		false,
		"Show debugging information generated by netplugin")
	flagSet.BoolVar(&opts.forceDeleteEp,
		"force-delete-ep",
		false,
		"force ep deletion upon container deletion")
	flagSet.BoolVar(&opts.jsonLog,
		"json-log",
		false,
		"Format logs as JSON")
	flagSet.StringVar(&opts.hostLabel,
		"host-label",
		defHostLabel,
		"label used to identify endpoints homed for this host, default is host name. If -config flag is used then host-label must be specified in the the configuration passed.")
	flagSet.BoolVar(&opts.nativeInteg,
		"native-integration",
		false,
		"do not listen to container runtime events, because the events are natively integrated into their call sequence and external integration is not required")
	flagSet.StringVar(&opts.cfgFile,
		"config",
		"",
		"plugin configuration. Use '-' to read configuration from stdin")
	flagSet.StringVar(&opts.vtepIP,
		"vtep-ip",
		defVtepIP,
		"My VTEP ip address")
	flagSet.StringVar(&opts.vlanIntf,
		"vlan-if",
		defVlanIntf,
		"My VTEP ip address")

	err = flagSet.Parse(os.Args[1:])
	if err != nil {
		log.Fatalf("Failed to parse command. Error: %s", err)
	}

	if opts.debug {
		log.SetLevel(log.DebugLevel)
		os.Setenv("CONTIV_TRACE", "1")
	}

	if opts.jsonLog {
		log.SetFormatter(&log.JSONFormatter{})
	}

	if opts.syslog != "" {
		configureSyslog(opts.syslog)
	}

	if flagSet.NFlag() < 1 {
		log.Infof("host-label not specified, using default (%s)", opts.hostLabel)
	}

	if utils.FetchSysAttrs() != nil {
		log.Fatalf("Error reading system attributes \n")
	} else {
		if utils.SysAttrs.OsType == "centos" {
			opts.forceDeleteEp = true
		}
	}

	defConfigStr := fmt.Sprintf(`{
                    "drivers" : {
                       "network": %q,
                       "state": "etcd"
                    },
                    "plugin-instance": {
                       "host-label": %q,
						"vtep-ip": %q,
						"vlan-if": %q
                    },
                    %q : {
                       "dbip": "127.0.0.1",
                       "dbport": 6640
                    },
                    "etcd" : {
                        "machines": ["http://127.0.0.1:4001"]
                    },
                    "crt" : {
                       "type": "docker"
                    },
//.........这里部分代码省略.........

func main() {
	var opts cliOpts
	var flagSet *flag.FlagSet

	defHostLabel, err := os.Hostname()

	// parse rest of the args that require creating state
	flagSet = flag.NewFlagSet("netplugin", flag.ExitOnError)
	flagSet.BoolVar(&opts.debug,
		"debug",
		false,
		"Show debugging information generated by netplugin")
	flagSet.StringVar(&opts.syslog,
		"syslog",
		"",
		"Log to syslog at proto://ip:port -- use 'kernel' to log via kernel syslog")
	flagSet.BoolVar(&opts.jsonLog,
		"json-log",
		false,
		"Format logs as JSON")
	flagSet.StringVar(&opts.hostLabel,
		"host-label",
		defHostLabel,
		"label used to identify endpoints homed for this host, default is host name. If -config flag is used then host-label must be specified in the the configuration passed.")
	flagSet.StringVar(&opts.pluginMode,
		"plugin-mode",
		"docker",
		"plugin mode docker|kubernetes")
	flagSet.StringVar(&opts.cfgFile,
		"config",
		"",
		"plugin configuration. Use '-' to read configuration from stdin")
	flagSet.StringVar(&opts.vtepIP,
		"vtep-ip",
		"",
		"My VTEP ip address")
	flagSet.StringVar(&opts.ctrlIP,
		"ctrl-ip",
		"",
		"Local ip address to be used for control communication")
	flagSet.StringVar(&opts.vlanIntf,
		"vlan-if",
		"",
		"VLAN uplink interface")
	flagSet.BoolVar(&opts.version,
		"version",
		false,
		"Show version")
	flagSet.StringVar(&opts.dbURL,
		"cluster-store",
		"etcd://127.0.0.1:2379",
		"state store url")

	err = flagSet.Parse(os.Args[1:])
	if err != nil {
		log.Fatalf("Failed to parse command. Error: %s", err)
	}

	if opts.version {
		fmt.Printf(version.String())
		os.Exit(0)
	}

	// Make sure we are running as root
	usr, err := user.Current()
	if (err != nil) || (usr.Username != "root") {
		log.Fatalf("This process can only be run as root")
	}

	if opts.debug {
		log.SetLevel(log.DebugLevel)
		os.Setenv("CONTIV_TRACE", "1")
	}

	if opts.jsonLog {
		log.SetFormatter(&log.JSONFormatter{})
	} else {
		log.SetFormatter(&log.TextFormatter{FullTimestamp: true, TimestampFormat: time.StampNano})
	}

	if opts.syslog != "" {
		configureSyslog(opts.syslog)
	}

	if flagSet.NFlag() < 1 {
		log.Infof("host-label not specified, using default (%s)", opts.hostLabel)
	}

	// default to using local IP addr
	localIP, err := cluster.GetLocalAddr()
	if err != nil {
		log.Fatalf("Error getting local address. Err: %v", err)
	}
	if opts.ctrlIP == "" {
		opts.ctrlIP = localIP
	}
	if opts.vtepIP == "" {
		opts.vtepIP = opts.ctrlIP
	}

//.........这里部分代码省略.........

func main() {
	var opts cliOpts
	var flagSet *flag.FlagSet

	defHostLabel, err := os.Hostname()
	if err != nil {
		log.Fatalf("Failed to fetch hostname. Error: %s", err)
	}

	// parse rest of the args that require creating state
	flagSet = flag.NewFlagSet("netd", flag.ExitOnError)
	flagSet.BoolVar(&opts.debug,
		"debug",
		false,
		"Show debugging information generated by netplugin")
	flagSet.StringVar(&opts.syslog,
		"syslog",
		"",
		"Log to syslog at proto://ip:port -- use 'kernel' to log via kernel syslog")
	flagSet.BoolVar(&opts.jsonLog,
		"json-log",
		false,
		"Format logs as JSON")
	flagSet.StringVar(&opts.hostLabel,
		"host-label",
		defHostLabel,
		"label used to identify endpoints homed for this host, default is host name. If -config flag is used then host-label must be specified in the the configuration passed.")
	flagSet.StringVar(&opts.pluginMode,
		"plugin-mode",
		"docker",
		"plugin mode docker|kubernetes")
	flagSet.StringVar(&opts.cfgFile,
		"config",
		"",
		"plugin configuration. Use '-' to read configuration from stdin")
	flagSet.StringVar(&opts.vtepIP,
		"vtep-ip",
		"",
		"My VTEP ip address")
	flagSet.StringVar(&opts.ctrlIP,
		"ctrl-ip",
		"",
		"Local ip address to be used for control communication")
	flagSet.StringVar(&opts.vlanIntf,
		"vlan-if",
		"",
		"My VTEP ip address")
	flagSet.BoolVar(&opts.version,
		"version",
		false,
		"Show version")
	flagSet.StringVar(&opts.routerIP,
		"router-ip",
		"",
		"My Router ip address")
	flagSet.StringVar(&opts.fwdMode,
		"fwd-mode",
		"bridge",
		"Forwarding Mode")

	err = flagSet.Parse(os.Args[1:])
	if err != nil {
		log.Fatalf("Failed to parse command. Error: %s", err)
	}

	if opts.version {
		fmt.Printf(version.String())
		os.Exit(0)
	}

	// Make sure we are running as root
	usr, err := user.Current()
	if (err != nil) || (usr.Username != "root") {
		log.Fatalf("This process can only be run as root")
	}

	if opts.debug {
		log.SetLevel(log.DebugLevel)
		os.Setenv("CONTIV_TRACE", "1")
	}

	if opts.jsonLog {
		log.SetFormatter(&log.JSONFormatter{})
	} else {
		log.SetFormatter(&log.TextFormatter{FullTimestamp: true, TimestampFormat: time.StampNano})
	}

	if opts.syslog != "" {
		configureSyslog(opts.syslog)
	}

	if opts.fwdMode != "bridge" && opts.fwdMode != "routing" {
		log.Infof("Invalid forwarding mode. Setting the mode to bridge ")
		opts.fwdMode = "bridge"
	}

	if flagSet.NFlag() < 1 {
		log.Infof("host-label not specified, using default (%s)", opts.hostLabel)
	}

//.........这里部分代码省略.........