NameVirtualHost sub.domain.com:80
<VirtualHost sub.domain.com:80>
  ServerName sub.domain.com
  DocumentRoot /srv/trac/unips

  <Directory /srv/trac/unips>Allow from all
  </Directory>

  <Location />

     SetHandler mod_python
     PythonHandler trac.web.modpython_frontend
     PythonOption TracEnv /srv/trac/unips
     PythonOption TracUriRoot /

</Location>
    <Location /login>
        AuthType Digest
        AuthName "unips"
        AuthDigestFile /etc/apache2/digest/unips
        Require valid-user
    </Location>

    ErrorDocument 401 default
    ErrorDocument 403 default
    ErrorLog /var/log/apache2/tracunips_error.log
    LogLevel warn
</VirtualHost>