[Nix-dev] Broken ghc for OS X on cache.nixos.org

[Richard Wallace]

On Thu, Oct 16, 2014 at 2:55 PM, Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk>
wrote:

> On 10/16/2014 09:53 PM, Richard Wallace wrote:
> > Hello all,
> >
> > In an effort to get our team to start using nix, I've setup a project of
> > ours to be built with nix.  One obstacle I've run into is that most of
> the
> > team (pretty much everyone except me) is using OS X, so I've been trying
> to
> > overcome the OS X ghc being broken in the nix cache [1].
> >
> > I've gone ahead and built a new ghc binary on OS X and created a cache
> > containing it and other Haskell packages.  I thought everything was going
> > great until I tried to actually use it by running
> >
> >   $ nix-shell shell.nix --option binary-caches http://mycache --command
> > 'cabal configure --enable-tests'
>
> I myself often wonder how to get nix to DWIM when it comes to binary
> caches. Does nix-build --option binary-caches … do what you want? Maybe
> nix-shell just ignores it…
>

No, same thing happens with nix-build or nix-env.


>
> > This still downloads the ghc package from http://cache.nixos.org, which
> is
> > what I'm trying to avoid.  I used wireshark to see what is going on, and
> it
> > appears that my cache is never checked, nix just goes and starts
> > downloading from cache.nixos.org.  My guess is that this is because of
> the
> > MANIFEST from the nixpkgs-unstable channel.  Is that correct?  If so, how
> > can I override that?
>
> You could try doing a manual nix-pull of your manifest. I do it to a
> local machine like so:
>
> nix-pull http://yuuki:3000/jobset/nixpkgs/trunk/channel/latest/MANIFEST
>
>
I will give that a try.  I'm not entirely sure it will work.  I guess the
question is, when doing a nix-pull, will the entry for ghc be replaced or
not?  It seems reasonable to me that it wouldn't be because the two caches
have the same checksum and everything, so they appear to be the "same".
So, from the perspective of nix, which one it pulls from should be
arbitrary.


> > Thanks,
> > Rich
> >
> > PS It would be great if this weren't a problem.  I was told this issue
> > should be getting resolved soon since there is a new OS X build box and
> > that I just needed to wait a few days.  Any idea when a fixed ghc for OS
> X
> > package will appear on cache.nixos.org?
>
> The update announcement was on the 9th and the unstable is currently on
> the commit from the 14th so I would have thought if it was fixed then it
> would be in the cache already. I think however than Haskell stuff on
> darwin was switched off so perhaps it just needs to be turned on again.
> You should ask around on #2689 about what's going on in that area.
>

Done. Hopefully someone in the know will update that issue with the latest
status soon.

Thanks.


>
> > [1] https://github.com/NixOS/nixpkgs/issues/2689
> >
> >
> >
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> >
>
>
> --
> Mateusz K.
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