text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <AK/String.h>
  #include <AK/Vector.h>
  #include <LibCore/ArgsParser.h>
  #include <LibCore/System.h>
  #include <LibMain/Main.h>
  #include <grp.h>
  #include <pwd.h>
  #include <stdio.h>
  #include <string.h>
  #include <sys/stat.h>
  #include <unistd.h>
  
  ErrorOr<int> serenity_main(Main::Arguments arguments)
  {
      TRY(Core::System::pledge("stdio rpath chown"));
  
      String spec;
      String path;
      bool dont_follow_symlinks = false;
  
      Core::ArgsParser args_parser;
      args_parser.set_general_help("Change the ownership of a file or directory.");
      args_parser.add_option(dont_follow_symlinks, "Don't follow symlinks", "no-dereference", 'h');
      args_parser.add_positional_argument(spec, "User and group IDs", "USER[:GROUP]");
      args_parser.add_positional_argument(path, "Path to file", "PATH");
      args_parser.parse(arguments);
  
      uid_t new_uid = -1;
      gid_t new_gid = -1;
  
      auto parts = spec.split_view(':', true);
      if (parts[0].is_empty() || (parts.size() == 2 && parts[1].is_empty()) || parts.size() > 2) {
          warnln("Invalid uid/gid spec");
          return 1;
      }
  
      auto number = parts[0].to_uint();
      if (number.has_value()) {
          new_uid = number.value();
      } else {
          auto passwd = TRY(Core::System::getpwnam(parts[0]));
          if (!passwd.has_value()) {
              warnln("Unknown user '{}'", parts[0]);
              return 1;
          }
          new_uid = passwd->pw_uid;
      }
  
      if (parts.size() == 2) {
          auto number = parts[1].to_uint();
          if (number.has_value()) {
              new_gid = number.value();
          } else {
              auto group = TRY(Core::System::getgrnam(parts[1]));
              if (!group.has_value()) {
                  warnln("Unknown group '{}'", parts[1]);
                  return 1;
              }
              new_gid = group->gr_gid;
          }
      }
  
      if (dont_follow_symlinks) {
          TRY(Core::System::lchown(path, new_uid, new_gid));
      } else {
          TRY(Core::System::chown(path, new_uid, new_gid));
      }
  
      return 0;
  }
  