class Bundler::Source::Rubygems

def install(spec)
  return ["Using #{version_message(spec)}", nil] if installed_specs[spec].any?
  # Download the gem to get the spec, because some specs that are returned
  # by rubygems.org are broken and wrong.
  if spec.source_uri
    s = Bundler.rubygems.spec_from_gem(fetch_gem(spec), Bundler.settings["trust-policy"])
    spec.__swap__(s)
  end
  path = cached_gem(spec)
  if Bundler.requires_sudo?
    install_path = Bundler.tmp(spec.full_name)
    bin_path     = install_path.join("bin")
  else
    install_path = Bundler.rubygems.gem_dir
    bin_path     = Bundler.system_bindir
  end
  installed_spec = nil
  Bundler.rubygems.preserve_paths do
    installed_spec = Bundler::GemInstaller.new(path,
      :install_dir         => install_path.to_s,
      :bin_dir             => bin_path.to_s,
      :ignore_dependencies => true,
      :wrappers            => true,
      :env_shebang         => true
    ).install
  end
  # SUDO HAX
  if Bundler.requires_sudo?
    Bundler.rubygems.repository_subdirectories.each do |name|
      src = File.join(install_path, name, "*")
      dst = File.join(Bundler.rubygems.gem_dir, name)
      if name == "extensions" && Dir.glob(src).any?
        src = File.join(src, "*/*")
        ext_src = Dir.glob(src).first
        ext_src.gsub!(src[0..-6], '')
        dst = File.dirname(File.join(dst, ext_src))
      end
      Bundler.mkdir_p dst
      Bundler.sudo "cp -R #{src} #{dst}" if Dir[src].any?
    end
    spec.executables.each do |exe|
      Bundler.mkdir_p Bundler.system_bindir
      Bundler.sudo "cp -R #{install_path}/bin/#{exe} #{Bundler.system_bindir}/"
    end
  end
  spec.loaded_from = "#{Bundler.rubygems.gem_dir}/specifications/#{spec.full_name}.gemspec"
  installed_spec.loaded_from = spec.loaded_from
  ["Installing #{version_message(spec)}", spec.post_install_message]
ensure
  if install_path && Bundler.requires_sudo?
    FileUtils.remove_entry_secure(install_path)
  end
end