Golang FlagSet.DurationVar方法代码示例

func FlagsForClient(ccfg *ClientConfig, flagset *flag.FlagSet) {
	flagset.DurationVar(&ccfg.IdleTimeout, "timeout", DefaultIdleTimeout, "amount of idle time before timeout")
	flagset.IntVar(&ccfg.IdleConnectionsToInstance, "maxidle", DefaultIdleConnectionsToInstance, "maximum number of idle connections to a particular instance")
	flagset.IntVar(&ccfg.MaxConnectionsToInstance, "maxconns", DefaultMaxConnectionsToInstance, "maximum number of concurrent connections to a particular instance")
	flagset.StringVar(&ccfg.Region, "region", GetDefaultEnvVar("SKYNET_REGION", DefaultRegion), "region client is located in")
	flagset.StringVar(&ccfg.Host, "host", GetDefaultEnvVar("SKYNET_HOST", DefaultRegion), "host client is located in")
}

// ApplyWithError populates the flag given the flag set and environment
func (f DurationFlag) ApplyWithError(set *flag.FlagSet) error {
	if f.EnvVar != "" {
		for _, envVar := range strings.Split(f.EnvVar, ",") {
			envVar = strings.TrimSpace(envVar)
			if envVal, ok := syscall.Getenv(envVar); ok {
				envValDuration, err := time.ParseDuration(envVal)
				if err != nil {
					return fmt.Errorf("could not parse %s as duration for flag %s: %s", envVal, f.Name, err)
				}

				f.Value = envValDuration
				break
			}
		}
	}

	eachName(f.Name, func(name string) {
		if f.Destination != nil {
			set.DurationVar(f.Destination, name, f.Value, f.Usage)
			return
		}
		set.Duration(name, f.Value, f.Usage)
	})

	return nil
}

// AddFlags adds libkbfs flags to the given FlagSet. Returns an
// InitParams that will be filled in once the given FlagSet is parsed.
func AddFlags(flags *flag.FlagSet) *InitParams {
	var params InitParams
	flags.BoolVar(&params.Debug, "debug", BoolForString(os.Getenv("KBFS_DEBUG")), "Print debug messages")
	flags.StringVar(&params.CPUProfile, "cpuprofile", "", "write cpu profile to file")

	flags.StringVar(&params.BServerAddr, "bserver", GetDefaultBServer(), "host:port of the block server")
	flags.StringVar(&params.MDServerAddr, "mdserver", GetDefaultMDServer(), "host:port of the metadata server")

	flags.BoolVar(&params.ServerInMemory, "server-in-memory", false, "use in-memory server (and ignore -bserver, -mdserver, and -server-root)")
	flags.StringVar(&params.ServerRootDir, "server-root", "", "directory to put local server files (and ignore -bserver and -mdserver)")
	flags.StringVar(&params.LocalUser, "localuser", "", "fake local user (used only with -server-in-memory or -server-root)")
	flags.DurationVar(&params.TLFValidDuration, "tlf-valid", tlfValidDurationDefault, "time tlfs are valid before redoing identification")
	flags.BoolVar(&params.LogToFile, "log-to-file", false, fmt.Sprintf("Log to default file: %s", defaultLogPath()))
	flags.StringVar(&params.LogFileConfig.Path, "log-file", "", "Path to log file")
	flags.DurationVar(&params.LogFileConfig.MaxAge, "log-file-max-age", 30*24*time.Hour, "Maximum age of a log file before rotation")
	params.LogFileConfig.MaxSize = 128 * 1024 * 1024
	flag.Var(SizeFlag{&params.LogFileConfig.MaxSize}, "log-file-max-size", "Maximum size of a log file before rotation")
	// The default is to *DELETE* old log files for kbfs.
	flag.IntVar(&params.LogFileConfig.MaxKeepFiles, "log-file-max-keep-files", 3, "Maximum number of log files for this service, older ones are deleted. 0 for infinite.")

	if getRunMode() != libkb.ProductionRunMode {
		flag.BoolVar(&params.EnableSharingBeforeSignup, "enable-sharing-before-signup", false, "enable sharing before signup")
	}
	return &params
}

// registerFlags defines all cfssl command flags and associates their values with variables.
func registerFlags(c *Config, f *flag.FlagSet) {
	f.StringVar(&c.Hostname, "hostname", "", "Hostname for the cert, could be a comma-separated hostname list")
	f.StringVar(&c.CertFile, "cert", "", "Client certificate that contains the public key")
	f.StringVar(&c.CSRFile, "csr", "", "Certificate signature request file for new public key")
	f.StringVar(&c.CAFile, "ca", "", "CA used to sign the new certificate")
	f.StringVar(&c.CAKeyFile, "ca-key", "", "CA private key")
	f.StringVar(&c.TLSCertFile, "tls-cert", "", "Other endpoint CA to set up TLS protocol")
	f.StringVar(&c.TLSKeyFile, "tls-key", "", "Other endpoint CA private key")
	f.StringVar(&c.TrustAnchorFile, "trust-anchors", "", "Trust anchors for client TLS verification")
	f.BoolVar(&c.RequireClientTLSCertificates, "client-auth", false, "Require client TLS verification")
	f.StringVar(&c.KeyFile, "key", "", "private key for the certificate")
	f.StringVar(&c.IntermediatesFile, "intermediates", "", "intermediate certs")
	f.StringVar(&c.CABundleFile, "ca-bundle", "", "path to root certificate store")
	f.StringVar(&c.IntBundleFile, "int-bundle", "", "path to intermediate certificate store")
	f.StringVar(&c.Stats, "stats", "", "period for statistics printing")
	f.StringVar(&c.Address, "address", "127.0.0.1", "Address to bind")
	f.IntVar(&c.Port, "port", 8888, "Port to bind")
	f.StringVar(&c.ConfigFile, "config", "", "path to configuration file")
	f.StringVar(&c.Profile, "profile", "", "signing profile to use")
	f.BoolVar(&c.IsCA, "initca", false, "initialise new CA")
	f.BoolVar(&c.RenewCA, "renewca", false, "re-generate a CA certificate from existing CA certificate/key")
	f.StringVar(&c.IntDir, "int-dir", "", "specify intermediates directory")
	f.StringVar(&c.Flavor, "flavor", "ubiquitous", "Bundle Flavor: ubiquitous, optimal and force.")
	f.StringVar(&c.Metadata, "metadata", "", "Metadata file for root certificate presence. The content of the file is a json dictionary (k,v): each key k is SHA-1 digest of a root certificate while value v is a list of key store filenames.")
	f.StringVar(&c.Domain, "domain", "", "remote server domain name")
	f.StringVar(&c.IP, "ip", "", "remote server ip")
	f.StringVar(&c.Remote, "remote", "", "remote CFSSL server")
	f.StringVar(&c.Label, "label", "", "key label to use in remote CFSSL server")
	f.StringVar(&c.AuthKey, "authkey", "", "key to authenticate requests to remote CFSSL server")
	f.StringVar(&c.ResponderFile, "responder", "", "Certificate for OCSP responder")
	f.StringVar(&c.ResponderKeyFile, "responder-key", "", "private key for OCSP responder certificate")
	f.StringVar(&c.Status, "status", "good", "Status of the certificate: good, revoked, unknown")
	f.StringVar(&c.Reason, "reason", "0", "Reason code for revocation")
	f.StringVar(&c.RevokedAt, "revoked-at", "now", "Date of revocation (YYYY-MM-DD)")
	f.DurationVar(&c.Interval, "interval", 4*helpers.OneDay, "Interval between OCSP updates (default: 96h)")
	f.BoolVar(&c.List, "list", false, "list possible scanners")
	f.StringVar(&c.Family, "family", "", "scanner family regular expression")
	f.StringVar(&c.Scanner, "scanner", "", "scanner regular expression")
	f.DurationVar(&c.Timeout, "timeout", 5*time.Minute, "duration (ns, us, ms, s, m, h) to scan each host before timing out")
	f.StringVar(&c.CSVFile, "csv", "", "file containing CSV of hosts")
	f.IntVar(&c.NumWorkers, "num-workers", 10, "number of workers to use for scan")
	f.IntVar(&c.MaxHosts, "max-hosts", 100, "maximum number of hosts to scan")
	f.StringVar(&c.Responses, "responses", "", "file to load OCSP responses from")
	f.StringVar(&c.Path, "path", "/", "Path on which the server will listen")
	f.StringVar(&c.Password, "password", "0", "Password for accessing PKCS #12 data passed to bundler")
	f.StringVar(&c.Usage, "usage", "", "usage of private key")
	f.StringVar(&c.PGPPrivate, "pgp-private", "", "file to load a PGP Private key decryption")
	f.StringVar(&c.Serial, "serial", "", "certificate serial number")
	f.StringVar(&c.DBConfigFile, "db-config", "", "certificate db configuration file")

	if pkcs11.Enabled {
		f.StringVar(&c.Module, "pkcs11-module", "", "PKCS #11 module")
		f.StringVar(&c.Token, "pkcs11-token", "", "PKCS #11 token")
		f.StringVar(&c.PIN, "pkcs11-pin", os.Getenv("USER_PIN"), "PKCS #11 user PIN")
		f.StringVar(&c.PKCS11Label, "pkcs11-label", "", "PKCS #11 label")
	}
}

// registerFlags defines all cfssl command flags and associates their values with variables.
func registerFlags(c *cli.Config, f *flag.FlagSet) {
	f.BoolVar(&c.List, "list", false, "list possible scanners")
	f.StringVar(&c.Family, "family", "", "scanner family regular expression")
	f.StringVar(&c.Scanner, "scanner", "", "scanner regular expression")
	f.DurationVar(&c.Timeout, "timeout", 5*time.Minute, "duration (ns, us, ms, s, m, h) to scan each host before timing out")
	f.StringVar(&c.IP, "ip", "", "remote server ip")
	f.StringVar(&c.CABundleFile, "ca-bundle", "", "path to root certificate store")
	f.IntVar(&log.Level, "loglevel", log.LevelInfo, "Log level")
}

// registerFlags defines all cfssl command flags and associates their values with variables.
func registerFlags(c *Config, f *flag.FlagSet) {
	f.StringVar(&c.Hostname, "hostname", "", "Hostname for the cert, could be a comma-separated hostname list")
	f.StringVar(&c.CertFile, "cert", "", "Client certificate that contains the public key")
	f.StringVar(&c.CSRFile, "csr", "", "Certificate signature request file for new public key")
	f.StringVar(&c.CAFile, "ca", "", "CA used to sign the new certificate")
	f.StringVar(&c.CAKeyFile, "ca-key", "", "CA private key")
	f.StringVar(&c.TLSCertFile, "tls-cert", "", "Other endpoint CA to set up TLS protocol")
	f.StringVar(&c.TLSKeyFile, "tls-key", "", "Other endpoint CA private key")
	f.StringVar(&c.MutualTLSCAFile, "mutual-tls-ca", "", "Mutual TLS - require clients be signed by this CA ")
	f.StringVar(&c.MutualTLSCNRegex, "mutual-tls-cn", "", "Mutual TLS - regex for whitelist of allowed client CNs")
	f.StringVar(&c.TLSRemoteCAs, "tls-remote-ca", "", "CAs to trust for remote TLS requests")
	f.StringVar(&c.MutualTLSCertFile, "mutual-tls-client-cert", "", "Mutual TLS - client certificate to call remote instance requiring client certs")
	f.StringVar(&c.MutualTLSKeyFile, "mutual-tls-client-key", "", "Mutual TLS - client key to call remote instance requiring client certs")
	f.StringVar(&c.KeyFile, "key", "", "private key for the certificate")
	f.StringVar(&c.IntermediatesFile, "intermediates", "", "intermediate certs")
	f.StringVar(&c.CABundleFile, "ca-bundle", "", "path to root certificate store")
	f.StringVar(&c.IntBundleFile, "int-bundle", "", "path to intermediate certificate store")
	f.StringVar(&c.Address, "address", "127.0.0.1", "Address to bind")
	f.IntVar(&c.Port, "port", 8888, "Port to bind")
	f.StringVar(&c.ConfigFile, "config", "", "path to configuration file")
	f.StringVar(&c.Profile, "profile", "", "signing profile to use")
	f.BoolVar(&c.IsCA, "initca", false, "initialise new CA")
	f.BoolVar(&c.RenewCA, "renewca", false, "re-generate a CA certificate from existing CA certificate/key")
	f.StringVar(&c.IntDir, "int-dir", "", "specify intermediates directory")
	f.StringVar(&c.Flavor, "flavor", "ubiquitous", "Bundle Flavor: ubiquitous, optimal and force.")
	f.StringVar(&c.Metadata, "metadata", "", "Metadata file for root certificate presence. The content of the file is a json dictionary (k,v): each key k is SHA-1 digest of a root certificate while value v is a list of key store filenames.")
	f.StringVar(&c.Domain, "domain", "", "remote server domain name")
	f.StringVar(&c.IP, "ip", "", "remote server ip")
	f.StringVar(&c.Remote, "remote", "", "remote CFSSL server")
	f.StringVar(&c.Label, "label", "", "key label to use in remote CFSSL server")
	f.StringVar(&c.AuthKey, "authkey", "", "key to authenticate requests to remote CFSSL server")
	f.StringVar(&c.ResponderFile, "responder", "", "Certificate for OCSP responder")
	f.StringVar(&c.ResponderKeyFile, "responder-key", "", "private key for OCSP responder certificate")
	f.StringVar(&c.Status, "status", "good", "Status of the certificate: good, revoked, unknown")
	f.StringVar(&c.Reason, "reason", "0", "Reason code for revocation")
	f.StringVar(&c.RevokedAt, "revoked-at", "now", "Date of revocation (YYYY-MM-DD)")
	f.DurationVar(&c.Interval, "interval", 4*helpers.OneDay, "Interval between OCSP updates (default: 96h)")
	f.BoolVar(&c.List, "list", false, "list possible scanners")
	f.StringVar(&c.Family, "family", "", "scanner family regular expression")
	f.StringVar(&c.Scanner, "scanner", "", "scanner regular expression")
	f.DurationVar(&c.Timeout, "timeout", 5*time.Minute, "duration (ns, us, ms, s, m, h) to scan each host before timing out")
	f.StringVar(&c.CSVFile, "csv", "", "file containing CSV of hosts")
	f.IntVar(&c.NumWorkers, "num-workers", 10, "number of workers to use for scan")
	f.IntVar(&c.MaxHosts, "max-hosts", 100, "maximum number of hosts to scan")
	f.StringVar(&c.Responses, "responses", "", "file to load OCSP responses from")
	f.StringVar(&c.Path, "path", "/", "Path on which the server will listen")
	f.StringVar(&c.CRL, "crl", "", "CRL URL Override")
	f.StringVar(&c.Password, "password", "0", "Password for accessing PKCS #12 data passed to bundler")
	f.StringVar(&c.Usage, "usage", "", "usage of private key")
	f.StringVar(&c.PGPPrivate, "pgp-private", "", "file to load a PGP Private key decryption")
	f.StringVar(&c.PGPName, "pgp-name", "", "PGP public key name, can be a comma-sepearted  key name list")
	f.StringVar(&c.Serial, "serial", "", "certificate serial number")
	f.StringVar(&c.CNOverride, "cn", "", "certificate common name (CN)")
	f.StringVar(&c.AKI, "aki", "", "certificate issuer (authority) key identifier")
	f.StringVar(&c.DBConfigFile, "db-config", "", "certificate db configuration file")
	f.IntVar(&log.Level, "loglevel", log.LevelInfo, "Log level (0 = DEBUG, 5 = FATAL)")
}

func FlagsForService(scfg *ServiceConfig, flagset *flag.FlagSet) {
	if scfg.DoozerConfig == nil {
		scfg.DoozerConfig = &DoozerConfig{}
	}
	FlagsForDoozer(scfg.DoozerConfig, flagset)
	flagset.StringVar(&scfg.UUID, "uuid", UUID(), "UUID for this service")
	flagset.StringVar(&scfg.Region, "region", GetDefaultEnvVar("SKYNET_REGION", DefaultRegion), "region service is located in")
	flagset.StringVar(&scfg.Version, "version", DefaultVersion, "version of service")
	flagset.DurationVar(&scfg.DoozerUpdateInterval, "dzupdate", DefaultDoozerUpdateInterval, "ns to wait before sending the next status update")
}

func FlagsForClient(ccfg *ClientConfig, flagset *flag.FlagSet) {
	if ccfg.DoozerConfig == nil {
		ccfg.DoozerConfig = &DoozerConfig{}
	}
	FlagsForDoozer(ccfg.DoozerConfig, flagset)
	flagset.DurationVar(&ccfg.IdleTimeout, "timeout", DefaultIdleTimeout, "amount of idle time before timeout")
	flagset.IntVar(&ccfg.IdleConnectionsToInstance, "maxidle", DefaultIdleConnectionsToInstance, "maximum number of idle connections to a particular instance")
	flagset.IntVar(&ccfg.MaxConnectionsToInstance, "maxconns", DefaultMaxConnectionsToInstance, "maximum number of concurrent connections to a particular instance")

}

func (cmd *GroupCreate) RegisterFlags(f *flag.FlagSet) {
	cmd.GroupThrottler.RegisterFlags(f)
	cmd.groupValues.RegisterFlags(f)

	f.StringVar(&cmd.file, "f", "", "JSON-encoded Machine specification file.")
	f.IntVar(&cmd.count, "n", 1, "Number of machines to be created.")
	f.BoolVar(&cmd.dry, "dry", false, "Dry run, tells the status of machines for the users.")
	f.DurationVar(&cmd.pullmongo, "pullmongo", 20*time.Minute, "Timeout for the build, pulls jMachine.status.state for status.")
	f.BoolVar(&cmd.eventer, "eventer", false, "Use kloud eventer instead of pulling MongoDB.")
}

// registerFlags defines all cfssl command flags and associates their values with variables.
func registerFlags(c *cli.Config, f *flag.FlagSet) {
	f.BoolVar(&c.List, "list", false, "list possible scanners")
	f.StringVar(&c.Family, "family", "", "scanner family regular expression")
	f.StringVar(&c.Scanner, "scanner", "", "scanner regular expression")
	f.DurationVar(&c.Timeout, "timeout", 5*time.Minute, "duration (ns, us, ms, s, m, h) to scan each host before timing out")
	f.StringVar(&c.CSVFile, "csv", "", "file containing CSV of hosts")
	f.IntVar(&c.NumWorkers, "num-workers", 10, "number of workers to use for scan")
	f.IntVar(&c.MaxHosts, "max-hosts", 100, "maximum number of hosts to scan")
	f.StringVar(&c.IP, "ip", "", "remote server ip")
	f.StringVar(&c.CABundleFile, "ca-bundle", "", "path to root certificate store")
}

// registerFlags defines all cfssl command flags and associates their values with variables.
func registerFlags(c *Config, f *flag.FlagSet) {
	f.StringVar(&c.Hostname, "hostname", "", "Hostname for the cert, could be a comma-separated hostname list")
	f.StringVar(&c.CertFile, "cert", "", "Client certificate that contains the public key")
	f.StringVar(&c.CSRFile, "csr", "", "Certificate signature request file for new public key")
	f.StringVar(&c.CAFile, "ca", "ca.pem", "CA used to sign the new certificate")
	f.StringVar(&c.CAKeyFile, "ca-key", "ca-key.pem", "CA private key")
	f.StringVar(&c.KeyFile, "key", "", "private key for the certificate")
	f.StringVar(&c.IntermediatesFile, "intermediates", "", "intermediate certs")
	f.StringVar(&c.CABundleFile, "ca-bundle", "/etc/cfssl/ca-bundle.crt", "Bundle to be used for root certificates pool")
	f.StringVar(&c.IntBundleFile, "int-bundle", "/etc/cfssl/int-bundle.crt", "Bundle to be used for intermediate certificates pool")
	f.StringVar(&c.Address, "address", "127.0.0.1", "Address to bind")
	f.IntVar(&c.Port, "port", 8888, "Port to bind")
	f.StringVar(&c.ConfigFile, "config", "", "path to configuration file")
	f.StringVar(&c.Profile, "profile", "", "signing profile to use")
	f.BoolVar(&c.IsCA, "initca", false, "initialise new CA")
	f.StringVar(&c.IntDir, "int-dir", "/etc/cfssl/intermediates", "specify intermediates directory")
	f.StringVar(&c.Flavor, "flavor", "ubiquitous", "Bundle Flavor: ubiquitous, optimal and force.")
	f.StringVar(&c.Metadata, "metadata", "/etc/cfssl/ca-bundle.crt.metadata", "Metadata file for root certificate presence. The content of the file is a json dictionary (k,v): each key k is SHA-1 digest of a root certificate while value v is a list of key store filenames.")
	f.StringVar(&c.Domain, "domain", "", "remote server domain name")
	f.StringVar(&c.IP, "ip", "", "remote server ip")
	f.StringVar(&c.Remote, "remote", "", "remote CFSSL server")
	f.StringVar(&c.Label, "label", "", "key label to use in remote CFSSL server")
	f.StringVar(&c.AuthKey, "authkey", "", "key to authenticate requests to remote CFSSL server")
	f.StringVar(&c.ResponderFile, "responder", "", "Certificate for OCSP responder")
	f.StringVar(&c.Status, "status", "good", "Status of the certificate: good, revoked, unknown")
	f.IntVar(&c.Reason, "reason", 0, "Reason code for revocation")
	f.StringVar(&c.RevokedAt, "revoked-at", "now", "Date of revocation (YYYY-MM-DD)")
	f.Int64Var(&c.Interval, "interval", int64(4*helpers.OneDay), "Interval between OCSP updates, in seconds (default: 4 days)")
	f.BoolVar(&c.List, "list", false, "list possible scanners")
	f.StringVar(&c.Family, "family", "", "scanner family regular expression")
	f.StringVar(&c.Scanner, "scanner", "", "scanner regular expression")
	f.DurationVar(&c.Timeout, "timeout", 0, "duration (ns, us, ms, s, m, h) to scan each host before timing out")
	f.StringVar(&c.Responses, "responses", "", "file to load OCSP responses from")
	f.StringVar(&c.Path, "path", "/", "Path on which the server will listen")
	f.StringVar(&c.Password, "password", "0", "Password for accessing PKCS #12 data passed to bundler")
	f.BoolVar(&c.UseLocal, "uselocal", false, "serve local static files as opposed to compiled ones")
	f.StringVar(&c.Usage, "usage", "dev", "usage of private key")

	if pkcs11.Enabled {
		f.StringVar(&c.Module, "pkcs11-module", "", "PKCS #11 module")
		f.StringVar(&c.Token, "pkcs11-token", "", "PKCS #11 token")
		f.StringVar(&c.PIN, "pkcs11-pin", os.Getenv("USER_PIN"), "PKCS #11 user PIN")
		f.StringVar(&c.PKCS11Label, "pkcs11-label", "", "PKCS #11 label")
	}
}

func (m *gocoverdir) setupFlags(fs *flag.FlagSet) {
	fs.StringVar(&m.args.covermode, "covermode", "", "Same as -covermode in 'go test'.  If running with -race, probably best not to set this.")
	fs.IntVar(&m.args.cpu, "cpu", -1, "Same as -cpu in 'go test'")
	fs.BoolVar(&m.args.race, "race", false, "Same as -race in 'go test'")
	fs.DurationVar(&m.args.timeout, "timeout", time.Second*3, "Same as -timeout in 'go test'")
	coveroutdir := os.Getenv("GOCOVERDIR_DIR")
	if coveroutdir == "" {
		coveroutdir = os.TempDir()
	}
	fs.StringVar(&m.args.coverprofile, "coverprofile", filepath.Join(coveroutdir, "coverage.out"), "Same as -coverprofile in 'go test', but will be a combined cover profile.")

	fs.IntVar(&m.args.depth, "depth", 10, "Directory depth to search.")
	fs.StringVar(&m.args.ignoreDirs, "ignoredirs", ".git:Godeps:vendor", "Color separated path of directories to ignore")

	fs.StringVar(&m.args.logfile, "logfile", "-", "Logfile to print debug output to.  Empty means be silent unless there is an error, then dump to stderr")

	fs.BoolVar(&m.args.printcoverage, "printcoverage", false, "Print coverage amount to stdout")
	fs.Float64Var(&m.args.requiredcoverage, "requiredcoverage", 0.0, "Program will fatal if coverage is < this value")
	fs.BoolVar(&m.args.htmlcoverage, "htmlcoverage", false, "If true, will generate coverage output in a temp file")
}

// Apply populates the flag given the flag set and environment
func (f DurationFlag) Apply(set *flag.FlagSet) {
	if f.EnvVars != nil {
		for _, envVar := range f.EnvVars {
			if envVal := os.Getenv(envVar); envVal != "" {
				envValDuration, err := time.ParseDuration(envVal)
				if err == nil {
					f.Value = envValDuration
					break
				}
			}
		}
	}

	for _, name := range f.Names() {
		if f.Destination != nil {
			set.DurationVar(f.Destination, name, f.Value, f.Usage)
			continue
		}
		set.Duration(name, f.Value, f.Usage)
	}
}

// Apply populates the flag given the flag set and environment
func (f DurationFlag) Apply(set *flag.FlagSet) {
	if f.EnvVar != "" {
		for _, envVar := range strings.Split(f.EnvVar, ",") {
			envVar = strings.TrimSpace(envVar)
			if envVal := os.Getenv(envVar); envVal != "" {
				envValDuration, err := time.ParseDuration(envVal)
				if err == nil {
					f.Value = envValDuration
					break
				}
			}
		}
	}

	eachName(f.Name, func(name string) {
		if f.Destination != nil {
			set.DurationVar(f.Destination, name, f.Value, f.Usage)
			return
		}
		set.Duration(name, f.Value, f.Usage)
	})
}

func (c *config) addflags(s *flag.FlagSet) {
	timeout := s.Duration("timeout", -1, "Time after which the attempt(s) will be interrupted. "+validTimeUnits)
	s.DurationVar(timeout, "t", -1, "Shortcut for --timeout")
	c.timeout = timeout

	maxAttempts := s.Int("max-attempts", 1, "Maximum number of attempts to make (unlimitted: -1)")
	s.IntVar(maxAttempts, "a", 1, "Shortcut for --max-attempts")
	c.maxAttempts = maxAttempts

	delay := s.Duration("retry-delay", 1*time.Second, "Delay between attempts. "+validTimeUnits)
	s.DurationVar(delay, "d", 1*time.Second, "Shortcut for --retry-delay")
	c.retryDelay = delay

	attemptTimeout := s.Duration("attempt-timeout", -1, "Time after which each individual attempt will be interrupted. "+validTimeUnits)
	s.DurationVar(attemptTimeout, "at", -1, "Shortcut for --attempt-timeout")
	c.attemptTimeout = attemptTimeout
}