[Nix-dev] Help with ghc errors after nix-channel --update

[Carlo Nucera]

Ok, I saw pkgs/top-level/haskell-packages.nix and I understand now
what you're talking about.
Is there a simple way to patch that value throug my
~/.nix-packages/config.nix file?

Carlo Nucera

2014-12-06 17:36 GMT+01:00 Benno Fünfstück <benno.fuenfstueck at gmail.com>:
> Hello,
>
> I think the problem occurs because in recent nixpkgs hashable was upgraded,
> but hashable is a GHC core package and thus cannot be replaced. I guess that
> previously the version provided by GHC was newer than the nixpkgs one, so it
> shadowed the nixpkgs version. Now, with the upgraded version, the nixpkgs
> one is picked instead of the GHC provided one.
>
> Unfortunately, I don't have access to a NixOS system right now so I can't
> test and fix it myself. The correct fix, if my theory is true, would be to
> set hashable to null in haskellPackages for GHC 7.8 and later. We already do
> that for some other packages (binary for example).
>
> --
> Benno
>
> Carlo Nucera <meditans at gmail.com> schrieb am Sa., 6. Dez. 2014 17:15:
>>
>> Hi all. I managed to create a nice setup for haskell
>> development. However, I did:
>>
>> $ sudo nix-channel --update
>> $ sudo nixos-channel rebuild
>>
>> After updating, my haskell installation is broken, ghc-pkg check is
>> full of errors, and the packages I installed no longer load in ghci.
>> I could rollback but there are new packages I need which are in the
>> recent nixos-unstable commits.
>>
>> So, here is the setup I use:
>>
>> $ sudo nix-channel --list
>> nixos http://nixos.org/channels/nixos-unstable
>>
>> $ nix-channel --list
>> # no output
>>
>> My global nixos config:
>> https://github.com/meditans/settings/blob/master/nixos/configuration.nix
>>
>> My ~/.nix-pkgs/config.nix:
>> https://github.com/meditans/settings/blob/master/nix-local/config.nix
>>
>> $ ghc-pkg list
>> output: http://lpaste.net/115809
>>
>> $ ghc-pkg check
>> output: http://lpaste.net/115810
>>
>> $ nix-env -q
>>
>> cabal-install-1.20.0.3
>> cabal2nix-1.72
>> ghc-7.8.3-wrapper
>> haskell-abcnotation-ghc7.8.3-1.8-shared
>> haskell-applicative-numbers-ghc7.8.3-0.1.3-shared
>> haskell-data-interval-ghc7.8.3-1.1.1-shared
>> haskell-extended-reals-ghc7.8.3-0.1.0.0-shared
>> haskell-lattices-ghc7.8.3-1.2.1.1-shared
>> haskell-lilypond-ghc7.8.3-1.8-shared
>> haskell-music-dynamics-literal-ghc7.8.3-1.8-shared
>> haskell-music-pitch-literal-ghc7.8.3-1.8-shared
>> haskell-musicxml2-ghc7.8.3-1.8-shared
>> haskell-positive-ghc7.8.3-0.4-shared
>> haskell-prettify-ghc7.8.3-1.0-shared
>> haskell-reverse-apply-ghc7.8.3-2.0.1-shared
>> haskell-ty-ghc7.8.3-0.1.6-shared
>> haskell-type-unary-ghc7.8.3-0.2.16-shared
>>
>> $ ghci
>> GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
>> Loading package ghc-prim ... linking ... done.
>> Loading package integer-gmp ... linking ... done.
>> Loading package base ... linking ... done.
>> Prelude> import Music.Abc
>>
>> <no location info>:
>>     Could not find module ‘Music.Abc’
>>     It is not a module in the current program, or in any known package.
>>
>> It's in this way for all the packages I'm trying to install.
>> Any suggestion on what to do?
>>
>> Carlo Nucera
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