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.) Thanks, Ludo’.
