[Nix-dev] Fwd: GHC pointed at the wrong package

[Benno Fünfstück]

Seems I forgot to send this email to the list ...
--
Benno

---------- Forwarded message ----------
From: Benno Fünfstück <benno.fuenfstueck at gmail.com>
Date: 2014-08-24 20:00 GMT+02:00
Subject: Re: [Nix-dev] GHC pointed at the wrong package
To: Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk>


Yes, GHC bug #4012 [https://ghc.haskell.org/trac/ghc/ticket/4012] is about
this issue.

You can use `nix-store --repair-path <store path>` to re-download a
specific store path from hydra.

--
Benno


2014-08-23 15:15 GMT+02:00 Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk>:

> On 08/23/2014 01:29 PM, Peter Simons wrote:
> > Hi Mateusz,
> >
> >  > There are problems in package regex-tdfa-1.2.0:
> >  >   dependency "parsec-3.1.5-ca5ed8f175b69e1a085cfeaf3b95f424" doesn't
> exist
> >  > There are problems in package regex-tdfa-rc-1.1.8.3:
> >  >   dependency "parsec-3.1.5-ca5ed8f175b69e1a085cfeaf3b95f424" doesn't
> exist
> >
> > the process that generates those IDs in GHC is non-deterministic. Two
> > people can compile the same library with the same version of GHC on the
> > same type of machine yet end up with two distinct IDs. It doesn't happen
> > often, but it does happen.
> >
> > I'd recommend running
> >
> >  $ nix-store --delete /nix/store/*-haskell-parsec-ghc7.8.3-3.1.5-shared
> >
> > on all your machines. Then the next build will download these packages
> > from Hydra, and you'll have a consistent build again. Note that you may
> > have to remove packages from your active profiles to make that deletion
> > process succeed.
> >
> > I hope this helps,
> > Peter
> >
>
> It's very unfortunate to hear about the package ID stuff. Is there a bug
> open?
>
> I managed to resolve the issue by getting rid of my parsec package as
> you advised. Unluckily it was depended on all the way from
> xmonad-extras. In the end I was able to remove -extras from my system as
> my config only needs -contrib, reboot, garbage collect and it works. I
> fear if this ever hits something xmonad directly depends on because I'll
> have to get rid of my WM to fix the issue…
>
> Perhaps a --force-overwrite flag should be created in nix-store as long
> as two hashes match?
>
> Thanks for help!
>
> --
> Mateusz K.
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