On Sun, Dec 20, 2015 at 5:34 PM, Ludovic Courtès <l...@gnu.org> wrote: > l...@gnu.org (Ludovic Courtès) skribis: > >>>From <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19641#16>: >> >> There’s another problem, though. When a dependency is a multiple-output >> package, all its outputs are added to the environment, because >> ‘package->transitive-inputs’ discards the information of which output is >> needed. >> >> So for instance, both the ‘out’ and the ‘debug’ output of Coreutils end >> up being downloaded and added to the environment, even though only ‘out’ >> is an input. >> >> Now, the problem is that ‘build-derivations’ can only build *all* the >> outputs of the given derivation. This could be worked around either: >> >> 1. by creating a “sink” derivation, for instance with >> ‘profile-derivation’, that could refer precisely to the output(s) >> needed; not ideal. > > David, I think you had started looking at doing exactly this. Do you > have a preliminary patch you’d like to post? > > I understand you may be busy preparing the Lisp Game Jam now and I > wouldn’t want to distract you from that. ;-) If you have something to > share, I’m happy to help start from there though (says the guy who sees > its ‘guix environment’ pointlessly downloading “debug” and “doc” outputs > again.)
The wip-environment-profiles branch has the code I've written thus far. I rebased it on master and resolved some conflicts in hopefully the right way. :) When I last hacked on it I got into a fully working state AFAICT, but the tests needed updating and that proved to be the most challenging part. If you're willing to finish it up, that would be awesome! Thanks, - Dave
