[Nix-dev] NixOS 16.09 stable branch-off is due in ~a month

[Luca Bruno]

+1 from me, @vcunat may know some drawbacks however

On Friday 26 August 2016, Tuomas Tynkkynen <tuomas.tynkkynen at iki.fi> wrote:

> 2016-08-23 14:27 GMT+03:00 Domen Kožar <domen at 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?
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