Gem::Security::TrustDir#verify

# File tmp/rubies/ruby-4.0.0/lib/rubygems/security/trust_dir.rb, line 105
def verify
  require "fileutils"
  if File.exist? @dir
    raise Gem::Security::Exception,
      "trust directory #{@dir} is not a directory" unless
        File.directory? @dir

    FileUtils.chmod 0o700, @dir
  else
    FileUtils.mkdir_p @dir, mode: @permissions[:trust_dir]
  end
end