+1 from me, @vcunat may know some drawbacks however On Friday 26 August 2016, Tuomas Tynkkynen <tuomas.tynkky...@iki.fi> wrote:
> 2016-08-23 14:27 GMT+03:00 Domen Kožar <do...@dev.si <javascript:;>>: > > Reminder: another week left until branch off. > > > > Hi nix-dev, > > I would like to raise the backwards compatibility concern about > multiple outputs. > The biggest problem IMHO is using antiquotation to build paths in > various scripts, > like '${pkgs.nix}/bin/nix-build ...', or for a concrete example: > > https://github.com/NixOS/nixos-channel-scripts/blob/master/default.nix#L27 > > So the derivation builds fine, except that the paths are broken as they > point > to the 'dev' outputs, not 'bin'/'out' where the binaries are. > > To fix this, I propose we change the convention of multiple outputs to have > the binaries in the first output (to have '${foo}/bin/bar' always work. > Then, to keep (propagated)BuildInputs working, mkDerivation would > need to be changed to use the dev outputs of packages added to > buildInputs (using the same logic that we already have in place > for systemPackages, i.e. 'environment.systemPackages = [ curl ];' > implicitly refers to 'curl.bin'). > > Of course, this doesn't resolve all such problems - for instance, > the '-I ${nix}/include/nix' in the above URL will now break instead. > But that failure (and in general, most references that actually want > to refer to 'dev' output) will fail at build time, instead of runtime. > > The original WIP pull request for this is at > https://github.com/NixOS/nixpkgs/pull/14766 > from some time ago. Here's how the changes look rebased to current master: > https://github.com/NixOS/nixpkgs/compare/master... > dezgeg:shuffle-outputs-v2 > So far that branch seems to work fine on both Linux and Darwin, e.g. Gnome > 3 > and KDE4 tests still build+pass, for instance. So I'm fairly confident > that all > the potential breakage could be fixed in time for 16.09. > > Thoughts? > _______________________________________________ > nix-dev mailing list > nix-dev@lists.science.uu.nl <javascript:;> > http://lists.science.uu.nl/mailman/listinfo/nix-dev > -- NixOS Linux <http://nixos.org>
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