define ikiwiki::instance($base_url = $domain, $ensure = 'present', $description = false,
                $adminuser = 'yourname', $adminemail = 'me@example.org', $instance = 'ikiwiki',
                $account_creation_password = false, $add_plugins = false, $disable_plugins = false,
                $protocol = 'https') {

  $desc = $description ? {
    false   => $title,
    default => $description,
  }

  case $ensure {
    'present': {
      file { "/etc/ikiwiki/$name.setup":
        ensure  => present,
        content => template('ikiwiki/ikiwiki.setup.erb'),
        owner   => www-data,
        group   => www-data,
        mode    => 640,
        notify  => Exec["ikiwiki_refresh_${name}"],
      }

      exec { "ikiwiki_refresh_${name}":
        command     => "/usr/local/sbin/ikiwiki-refresh $name $instance",
        user        => root,
        refreshonly => true,
      }
  
      if !defined(File["${ikiwiki::sites_folder}/${name}/${instance}_src"]) {
        file { "${ikiwiki::sites_folder}/${name}/${instance}_src":
          ensure  => directory,
          owner   => www-data,
          group   => www-data,
          recurse => true,
          notify  => Exec["ikiwiki_refresh_${name}"],
          require => File["${ikiwiki::sites_folder}/${name}"],
        }
      }

      if !defined(File["${ikiwiki::sites_folder}/${name}/${instance}"]) {
        file { "${ikiwiki::sites_folder}/${name}/${instance}":
          ensure  => directory,
          owner   => www-data,
          group   => www-data,
          recurse => true,
          require => File["${ikiwiki::sites_folder}/${name}"],
        }
      }

      if !defined(File["${ikiwiki::sites_folder}/${name}"]) {
        file { "${ikiwiki::sites_folder}/${name}":
          ensure  => directory,
          owner   => root,
          group   => root,
        }
      }

      # The post-update hook should have www-data as owner so
      # gitolite can do a setuid to it and write to ikiwiki
      # folders without messing the permission scheme.
      #
      # The same is valid for the cgi.
      #
      # See http://ikiwiki.info/rcs/git/
      #     http://ikiwiki.info/forum/multi-user_setup_of_ikiwiki__44___gitolite_and_apache2_in_Debian_Sid/
      #
      file { [ "/var/git/repositories/${name}.git/hooks/post-update",
               "${ikiwiki::sites_folder}/${name}/${instance}/ikiwiki.cgi" ]:
        ensure  => present,
        owner   => www-data,
        group   => gitolite,
        mode    => 6550,
        require => File["/etc/ikiwiki/$name.setup"],
      }
    }
    'absent': {
      file { "/etc/ikiwiki/$name.setup":
        ensure  => absent,
      }
    }
  }
}