code: func (n *ExecNode) execCommand() *exec.Cmd {
  	return &exec.Cmd{
  		Path: reexec.Self(),
  		Args: []string{"p2p-node", strings.Join(n.Config.Node.Services, ","), n.ID.String()},
  	}
  }
docs: // execCommand returns a command which runs the node locally by exec'ing
  // the current binary but setting argv[0] to "p2p-node" so that the child
  // runs execP2PNode