class Bundler::Source::Rubygems

def install(spec, opts = {})
  force = opts[:force]
  ensure_builtin_gems_cached = opts[:ensure_builtin_gems_cached]
  if ensure_builtin_gems_cached && builtin_gem?(spec)
    if !cached_path(spec)
      cached_built_in_gem(spec) unless spec.remote
      force = true
    else
      spec.loaded_from = loaded_from(spec)
    end
  end
  if installed?(spec) && (!force || spec.name.eql?("bundler"))
    Bundler.ui.info "Using #{version_message(spec)}"
    return nil # no post-install message
  end
  # Download the gem to get the spec, because some specs that are returned
  # by rubygems.org are broken and wrong.
  if spec.remote
    # Check for this spec from other sources
    uris = [spec.remote.anonymized_uri]
    uris += remotes_for_spec(spec).map(&:anonymized_uri)
    uris.uniq!
    Installer.ambiguous_gems << [spec.name, *uris] if uris.length > 1
    s = Bundler.rubygems.spec_from_gem(fetch_gem(spec), Bundler.settings["trust-policy"])
    spec.__swap__(s)
  end
  unless Bundler.settings[:no_install]
    message = "Installing #{version_message(spec)}"
    message << " with native extensions" if spec.extensions.any?
    Bundler.ui.confirm message
    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::RubyGemsGemInstaller.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
        SharedHelpers.filesystem_access(dst) do |p|
          Bundler.mkdir_p(p)
        end
        Bundler.sudo "cp -R #{src} #{dst}" if Dir[src].any?
      end
      spec.executables.each do |exe|
        SharedHelpers.filesystem_access(Bundler.system_bindir) do |p|
          Bundler.mkdir_p(p)
        end
        Bundler.sudo "cp -R #{install_path}/bin/#{exe} #{Bundler.system_bindir}/"
      end
    end
    installed_spec.loaded_from = loaded_from(spec)
  end
  spec.loaded_from = loaded_from(spec)
  spec.post_install_message
ensure
  Bundler.rm_rf(install_path) if Bundler.requires_sudo?
end