Everything, probably, using vmbuilder (and/or vagrant as Nick Simpson suggests). But that's not the point here. It is to provide exact steps that people can follow to get a basic (virtual) machine that they can use to do gitian builds.

I didn't want to end up with a gitian-builder-that-builds-a-gitian-builder :-) The host machine may not even have any scripting languages installed (in the case of Windows).

It may be possible to script *some* parts (most of the quoted bash script is runnable as script) without automating the entire process, but I hope that over time we can make Gitian itself easier to use/setup, so that less steps are needed in the first place.

Wladimir