add --version CLI that prints version and quits

main/params.go

@@ -87,6 +87,9 @@ func init() {
 
 	fs := flag.NewFlagSet("gecko", flag.ContinueOnError)
 
+	// If this is true, print the version and quit.
+	version := fs.Bool("version", false, "If true, print version and quit")
+
 	// NetworkID:
 	networkName := fs.String("network-id", genesis.TestnetName, "Network ID this node will connect to")
 
@@ -152,6 +155,11 @@ func init() {
 
 	ferr := fs.Parse(os.Args[1:])
 
+	if *version { // If --version used, print version and exit
+		fmt.Println(node.Version.String())
+		os.Exit(0)
+	}
+
 	if ferr == flag.ErrHelp {
 		// display usage/help text and exit successfully
 		os.Exit(0)

node/node.go

@@ -55,7 +55,8 @@ const (
 var (
 	genesisHashKey = []byte("genesisID")
 
-	nodeVersion   = version.NewDefaultVersion("avalanche", 0, 5, 1)
+	// Version is the version of this code
+	Version       = version.NewDefaultVersion("avalanche", 0, 5, 1)
 	versionParser = version.NewDefaultParser()
 )
 
@@ -156,7 +157,7 @@ func (n *Node) initNetworking() error {
 		n.ID,
 		n.Config.StakingIP,
 		n.Config.NetworkID,
-		nodeVersion,
+		Version,
 		versionParser,
 		listener,
 		dialer,
@@ -525,7 +526,7 @@ func (n *Node) Initialize(Config *Config, logger logging.Logger, logFactory logg
 	n.Log = logger
 	n.LogFactory = logFactory
 	n.Config = Config
-	n.Log.Info("Gecko version is: %s", nodeVersion)
+	n.Log.Info("Gecko version is: %s", Version)
 
 	httpLog, err := logFactory.MakeSubdir("http")
 	if err != nil {