install_rdoc

# File lib/rubygems/commands/setup_command.rb, line 309
  def install_rdoc
    gem_doc_dir = File.join Gem.dir, 'doc'
    rubygems_name = "rubygems-#{Gem::VERSION}"
    rubygems_doc_dir = File.join gem_doc_dir, rubygems_name

    begin
      Gem.ensure_gem_subdirectories Gem.dir
    rescue SystemCallError
      # ignore
    end

    if File.writable? gem_doc_dir and
       (not File.exist? rubygems_doc_dir or
        File.writable? rubygems_doc_dir) then
      say "Removing old RubyGems RDoc and ri" if @verbose
      Dir[File.join(Gem.dir, 'doc', 'rubygems-[0-9]*')].each do |dir|
        rm_rf dir
      end

      require 'rubygems/rdoc'

      fake_spec = Gem::Specification.new 'rubygems', Gem::VERSION
      def fake_spec.full_gem_path
        File.expand_path '../../../..', __FILE__
      end

      generate_ri   = options[:document].include? 'ri'
      generate_rdoc = options[:document].include? 'rdoc'

      rdoc = Gem::RDoc.new fake_spec, generate_rdoc, generate_ri
      rdoc.generate

      return true
    elsif @verbose then
      say "Skipping RDoc generation, #{gem_doc_dir} not writable"
      say "Set the GEM_HOME environment variable if you want RDoc generated"
    end

    return false
  end