def install_librarian(opts = {})
      # Check for 'librarian_version' option
      librarian_version = opts[:librarian_version] ||= nil

      hosts.each do |host|
        install_package host, 'rubygems'
        install_package host, 'git'
        if librarian_version
          on host, "gem install --no-ri --no-rdoc librarian-puppet -v '#{librarian_version}'" 
        else
          on host, 'gem install --no-ri --no-rdoc librarian-puppet' 
        end
      end
    end
def install_librarian(opts = {})
      # Check for 'librarian_version' option
      librarian_version = opts[:librarian_version] ||= nil

      hosts.each do |host|
        install_package host, 'rubygems'
        install_package host, 'git'
        if librarian_version
          on host, "gem install --no-ri --no-rdoc librarian-puppet -v '#{librarian_version}'" 
        else
          on host, 'gem install --no-ri --no-rdoc librarian-puppet' 
        end
      end
    end
Install rubygems and the librarian-puppet gem onto each host