use approx in grml-debootstrap like:
% grml-debootstrap -r lenny -t /dev/sda1 -m http://127.0.0.1:9999/debian
--
-Simple webserver with python
+Simple webserver with python:
% python -m SimpleHTTPServer
--
+Upgrade only packages from the grml-stable Debian repository:
+
+echo 'deb http://deb.grml.org/ grml-stable main' > /etc/apt/grml-stable.list
+apt-get -o Dir::Etc::SourceList=/etc/apt/grml-stable.list update
+apt-get upgrade
+--