generate_bin

# File lib/rubygems/installer.rb, line 390
  def generate_bin
    return if spec.executables.nil? or spec.executables.empty?

    Dir.mkdir @bin_dir unless File.exist? @bin_dir
    raise Gem::FilePermissionError.new(@bin_dir) unless File.writable? @bin_dir

    spec.executables.each do |filename|
      filename.untaint
      bin_path = File.join gem_dir, spec.bindir, filename

      unless File.exist? bin_path then
        # TODO change this to a more useful warning
        warn "#{bin_path} maybe `gem pristine #{spec.name}` will fix it?"
        next
      end

      mode = File.stat(bin_path).mode | 0111
      FileUtils.chmod mode, bin_path

      check_executable_overwrite filename

      if @wrappers then
        generate_bin_script filename, @bin_dir
      else
        generate_bin_symlink filename, @bin_dir
      end

    end
  end