Debootstrap is a tool which will install a Debian base system into
a subdirectory of another, already installed system. It doesn't
require an installation CD, just access to a Debian repository. It
can also be installed and run from another operating system, so,
for instance, you can use debootstrap to install Debian onto an
unused partition from a running Gentoo system. It can also be used
to create a rootfs for a machine of a different architecture, which
is known as "cross-debootstrapping".
tamiko@gentoo.org
Matthias Maier