[Nix-dev] Locally built haskell package not showing up in ghci

[Carlo Nucera]

I did better, to streamline the problems, I created a dedicated vm to keep
things clean. So here is what I did:

1) I followed this guide http://fluffynukeit.com/series/haskell-nixos/
to establish ~/nixpkgs as my base for packages, adding this in my
.zshrc:

> rm -r ~/.nix-defexpr
> ln -s ~/nixpkgs ~/.nix-defexpr
> export NIX_PATH=/home/carlo:nixos-config=/etc/nixos/configuration.nix;

2) I installed ghc, cabalInstall and cabal2nix in my environment,
with:

> nix-env -iA haskellPackages.ghc
> etc..

3) I packaged software as usual in that guide.

Now, look at the image of dependencies in
"https://hackage.haskell.org/package/music-suite". I installed without
problems the packages music-pitch-literal and music-dynamics-literal,
whose dependencies are all already packaged. I tested them in ghci,
all fine. But when I went on packaging lilypond, it created a problem
in my configuration, so that now ghc-pkg check reports errors in
installed packages. Also, lilypond does not show up when I try to
import it from ghci.

Could you help me to point out the errors I'm doing here?

2014-12-02 18:54 GMT+01:00 Benno Fünfstück <benno.fuenfstueck at gmail.com>:
> Hi Carlo,
>
> can you try running nix-shell with --pure as an addiitional argument? If you
> don't pass --pure, nix-shell might pick up packages from your user
> environment.
>
> Benno
>
> Carlo Nucera <meditans at gmail.com> schrieb am Mon Dec 01 2014 at 18:59:09:
>>
>> Hi all,
>> a couple weeks ago I was trying to package the haskell music-suite for
>> nix. I stopped for a few weeks to let the mantainer fix some problems
>> with bounds on dependencies. However, when starting to package again
>> today, I found an unexpected problem.
>>
>> Let's say I'm packaging up music-dynamics-literal, a very simple
>> package. I add the expression in top-level/haskellPackages, and create
>> the .nix file with cabal2nix in the right place.
>>
>> Then I install the package with
>> code/nixpkgs $ nix-env -f . -iA haskellPackages.musicDynamicsLiteral
>>
>> and the installation succeeds, but I'm not able to import
>> Music.Dynamics.Literal in ghci.
>>
>> I also tried with the command
>> nix-shell -I nixpkgs=. -p haskellPackages.musicDynamicsLiteral
>> haskellPackages.ghc
>> to no avail.
>>
>> My nix-env -q contains, among other things:
>> ghc-7.8.3-wrapper
>> haskell-music-dynamics-literal-ghc7.8.3-1.8-shared
>>
>> And my ghc-pkg list is here: http://lpaste.net/115449
>> (I gather that there are broken packages, but I didn't solve the issue
>> nuking ~/.ghc or ~/.cabal)
>>
>> Do you have any pointer?
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