code: func init() {
  	sv.GitCommit = gitCommit
  	defaultNodeConfig.Name = clientIdentifier
  	defaultNodeConfig.Version = sv.VersionWithCommit(gitCommit)
  	defaultNodeConfig.P2P.ListenAddr = ":30399"
  	defaultNodeConfig.IPCPath = "bzzd.ipc"
  	// Set flag defaults for --help display.
  	utils.ListenPortFlag.Value = 30399
  }
docs: // This init function sets defaults so cmd/swarm can run alongside geth.