class Chef::Knife::GroupAdd

def run
  member_type, member_name, group_name = name_args
  if name_args.length != 3
    show_usage
    ui.fatal "You must specify member type [client|group|user], member name and group name"
    exit 1
  end
  validate_member_name!(group_name)
  validate_member_type!(member_type)
  validate_member_name!(member_name)
  if group_name.downcase == "users"
    ui.fatal "knife group can not manage members of Chef Infra Server's 'users' group, which contains all users."
    exit 1
  end
  add_to_group!(member_type, member_name, group_name)
end