Gem::Commands::UpdateCommand#preparing_gem_layout_for

# File tmp/rubies/ruby-3.1.3/lib/rubygems/commands/update_command.rb, line 192
def preparing_gem_layout_for(version)
  if Gem::Version.new(version) >= Gem::Version.new("3.2.a")
    yield
  else
    require "tmpdir"
    tmpdir = Dir.mktmpdir
    FileUtils.mv Gem.plugindir, tmpdir

    status = yield

    if status
      FileUtils.rm_rf tmpdir
    else
      FileUtils.mv File.join(tmpdir, "plugins"), Gem.plugindir
    end

    status
  end
end