find: Add -gid option to filter by owning group ID

Base/usr/share/man/man1/find.md

@@ -76,6 +76,8 @@ by the current user.
  the specified reference file. If `file` is a symbolic link and the `-L`
  option is in use, then the creation time of the file pointed to by the
  symbolic link is used.
+* `-gid [-|+]number`: Checks if the file is owned by a group with an ID less
+ than, greater than or exactly `number`.
 * `-print`: Outputs the file path, followed by a newline. Always evaluates to
  true.
 * `-print0`: Outputs the file path, followed by a zero byte. Always evaluates to

Userland/Utilities/find.cpp

@@ -494,6 +494,26 @@ class NewerCommand final : public StatCommand {
  TimestampType m_timestamp_type { TimestampType::LastModification };
 };
 
+class GidCommand final : public StatCommand {
+public:
+ GidCommand(char const* arg)
+ {
+ auto gid_or_error = NumericRange<gid_t>::parse({ arg, strlen(arg) });
+ if (gid_or_error.is_error())
+ fatal_error("find: Invalid argument '{}' to '-gid'", arg);
+
+ m_gid_range = gid_or_error.release_value();
+ }
+
+private:
+ virtual bool evaluate(struct stat const& stat) const override
+ {
+ return m_gid_range.contains(stat.st_gid);
+ }
+
+ NumericRange<gid_t> m_gid_range;
+};
+
 class PrintCommand final : public Command {
 public:
  PrintCommand(char terminator = '\n')
@@ -713,6 +733,10 @@ static OwnPtr<Command> parse_simple_command(Vector<char*>& args)
  if (args.is_empty())
  fatal_error("-cnewer: requires additional arguments");
  return make<NewerCommand>(args.take_first(), NewerCommand::TimestampType::Creation);
+ } else if (arg == "-gid") {
+ if (args.is_empty())
+ fatal_error("-gid: requires additional arguments");
+ return make<GidCommand>(args.take_first());
  } else if (arg == "-print") {
  g_have_seen_action_command = true;
  return make<PrintCommand>();