I've written yet another "clean environment" script for CRUX called clean-build[1]. It is unique in that it uses union filesystems to keep core intact while testing ports, or use core in multiple envorinments simultaneously. It requires unionfs-fuse[2] to run, this will change when/if the kernel based unionfs is merged. It's mostly undocumented and there's probably one or two "undocumented features", but is in a useable state. I'm currently looking for people interested in such a tool to help test it further. How it should work: $ clean-build initcore $ clean-build installcore [ make required changes in core directory, eg: edit config files] $ clean-build startenv $ chroot union [ do stuff in clean environment ] $ clean-build stopenv As I said, there's probably a few bugs so YMMV. At the moment it is only possible to use one overlay, but future versions will let you stack directories on top of each other. So for example you could build xorg in an overlay then be able to reuse it for other environments. [1] http://git.die.net.au/cgit/crux/tools/cleanbuild [2] http://podgorny.cz/moin/UnionFsFuse -- Lucas Hazel <lucas@die.net.au>