minio: Server upon start displays a message if update is available.

This code also handles to turn itself off when network is not
available and if request fails. Also prints only when the update
is available.

minio-main.go

@@ -200,7 +200,7 @@ func initServer(c *cli.Context) {
 	}
 }
 
-// check init arguments.
+// Check init arguments.
 func checkInitSyntax(c *cli.Context) {
 	if !c.Args().Present() || c.Args().First() == "help" {
 		cli.ShowCommandHelpAndExit(c, "init", 1)
@@ -214,8 +214,7 @@ func checkInitSyntax(c *cli.Context) {
 	}
 }
 
-// extract port number from address.
-// address should be of the form host:port
+// Extract port number from address address should be of the form host:port.
 func getPort(address string) int {
 	_, portStr, e := net.SplitHostPort(address)
 	fatalIf(probe.NewError(e), "Unable to split host port.", nil)
@@ -307,6 +306,7 @@ func serverMain(c *cli.Context) {
 		cli.ShowCommandHelpAndExit(c, "server", 1)
 	}
 
+	// get backend.
 	backend := serverConfig.GetBackend()
 	if backend.Type == "fs" {
 		// Initialize file system.
@@ -348,6 +348,7 @@ func serverMain(c *cli.Context) {
 		// Start server.
 		err = minhttp.ListenAndServe(apiServer)
 		errorIf(err.Trace(), "Failed to start the minio server.", nil)
+		return
 	}
 	console.Println(colorGreen("No known backends configured, please use ‘minio init --help’ to initialize a backend."))
 }