[Nix-dev] Developing with older packages

[Richard Wallace]

On Mon, Sep 8, 2014 at 9:03 AM, Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk>
wrote:

> On 09/08/2014 04:56 PM, Richard Wallace wrote:
> > Hello,
> >
> > I'm using nix-shell to setup a Haskell environment for development.  On a
> > project I ran into a problem recently, and I'm curious if there is a
> > common/preferred way of solving it.
> >
> > The problem I ran into is that the project depends on the mongoDB 1.5
> > package.  The API changed drastically in 2.0 and we're not ready to
> > undertake the upgrade yet.  I think I can handle this by creating a
> nixpkgs
> > directory in the project, putting a mongoDB/default.nix file in there
> that
> > is setup for the version we need, then override it in our shell.nix file
> > like this:
> >
> > let
> >
> >    pkgs = import <nixpkgs> {};
> >
> >    haskellPackages = pkgs.haskellPackages.override {
> >
> >      extension = self: super: {
> >        mongoDB = self.callPackage nixpkgs/mongoDB {};
> >        ourkidsclass = self.callPackage ./. {};
> >
> >      };
> >
> >    };
> >
> > Is this a reasonable approach? Is there a better way?
> >
> > Thanks,
> > Rich
> >
> >
> >
> > _______________________________________________
> > nix-dev mailing list
> > nix-dev at lists.science.uu.nl
> > http://lists.science.uu.nl/mailman/listinfo/nix-dev
> >
>
> This looks as good of a solution as any other one could come up with. Is
> there something you're dissatisfied with that you would like to have in
> a ‘better’ solution?
>
>
Well, the mongoDB package isn't the only one that I want to get a specific
version of.  We originally built it with a sandbox and used `cabal freeze`
to make sure everyone is using the same versions.  So there are a number of
such packages and I was hoping for something a bit more automated.  Perhaps
I can script something to make it a bit easier to maintain.

Rich



> --
> Mateusz K.
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