That being said, this is what you should do (after gpg-verifying
this message):
somebox$ sudo sh -c 'echo deb http://www.freewrt.org/~tg/dp cross
main >>/etc/apt/sources.list'
# note I choose the "cross" repo because it does not contain
# any packages that would replace your normal debian packages
# during a dist-upgrade, unlike some others of mine
somebox$ sudo apt-get update
somebox$ sudo apt-get install --no-install-recommends
wtf-debian-keyring
# now you can do, for example
somebox$ sudo cowbuilder --create --mirror
http://www.freewrt.org/~tg/dp \
--distribution sid --debootstrap debootstrap \
--debootstrapopts
--keyring=/usr/share/keyrings/wtf-debian-keyring.gpg \
--debootstrapopts --variant=buildd \
--debootstrapopts
--include=apt,wtf-debian-keyring,debian-ports-archive-keyring
# or this (even with https); omit "--variant=buildd" to get
# a regular debian installation
somebox$ sudo debootstrap --variant=buildd \
--include=apt,wtf-debian-keyring,debian-ports-archive-keyring \
sid /target http://www.freewrt.org/~tg/dp
# now go read https://www.freewrt.org/~tg/sources.txt