FreeBSD offers an embedded version called nanobsd that seems to use the same update "philosophy". It's actually nanobsd.sh, a shell script by Poul-Henning Kamp

FreeBSD offers an embedded version called nanobsd that seems to use the same update "philosophy". It's actually nanobsd.sh, a shell script by Poul-Henning Kamp. So, that IS open source, although I doubt it's GPL ;) http://www.freebsd.org/cgi/man.cgi?query=nanobsd http://www.freebsd.org/cgi/man.cgi?query=nanobsd