On Fri, Feb 12, 2016 at 4:07 PM, Ludovic Courtès <l...@gnu.org> wrote: > "Thompson, David" <dthomps...@worcester.edu> skribis: > >> 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! > > It took me a while but I’ve finally finished it and pushed as 779aa00. > > I took a different strategy for the tests, which is to rely (in part) on > the output of ‘guix gc --references’ to determine whether the profile > contains all we need.
Thank you! I'm excited that this is finally in master. - Dave
