Hi Guix, to me the biggest downside of using “guix time-machine” is that it has to do a lot of boring work before the interesting work begins. The boring work includes building Guix derivations for the given channels, most of which have long been collected as garbage on ci.guix.gnu.org.
It would be helpful, I think, to more aggressively cache these derivations and their outputs, and to go back in time and build the derivatinons for past revisions of Guix. I would expect there to be a lot of overlap in the produced files, so perhaps it won’t cost all that much in terms of storage. What do you think? -- Ricardo
