# File lib/bundler/source/git.rb, line 152
      def install(spec)
        Bundler.ui.info "Using #{spec.name} (#{spec.version}) from #{to_s} "
        if requires_checkout? && !@copied
          Bundler.ui.debug "  * Checking out revision: #{ref}"
          git_proxy.copy_to(install_path, submodules)
          serialize_gemspecs_in(install_path)
          @copied = true
        end
        generate_bin(spec)
      end