[Nix-dev] Haskell NG: Local packages

[Ertugrul Söylemez]

> I believe Peter's message <87mw5qvj9x.fsf at write-only.cryp.to> could
> answer my question.  I will give it a try.

It does and works well.  Thanks anyway!


>> I have a bunch of local Haskell packages, mostly libraries.  The package
>> X lives in the directory `<ertes-src/X/main>`.  There are lots of direct
>> and indirect dependencies between them.  My current solution is ad hoc
>> and rather ugly.  I'm using the following hand-crafted `shell.nix` file
>> in every project:
>>
>>     { pkgs ? import <nixpkgs> {} }:
>>
>>     let inherit (pkgs.haskellngPackages) callPackage;
>>
>>         extPkg = path: deps:
>>             (callPackage (import path) deps).override (args: args // {
>>                 mkDerivation = expr:
>>                     args.mkDerivation (expr // {
>>                         src = pkgs.fetchdarcs { url = path; };
>>                     });
>>             });
>>
>>         thisPkg = callPackage (import ./devel.nix) {
>>             direct-dep1 = extPkg <ertes-src/dep1/main> {
>>                 indirect-dep1 = ...;
>>                 indirect-dep2 = ...;
>>             };
>>             direct-dep2 = extPkg <ertes-src/dep2/main> {};
>>         };
>>
>>     in thisPkg.env
>>
>> Do not pay too much attention to the `extPkg` function.  It just works
>> around cabal2nix' lack of support for Darcs URLs.
>>
>> My question is:  Is there a nicer and more principled way to solve this?
>> Ideally I could simply add all of my local packages in some way to my
>> `~/.nixpkgs/config.nix`.  Then they could just depend on each other
>> regularly and I wouldn't need any shell.nix hackery.  I'm guessing that
>> I need to override haskellngPackages in some way or perhaps create my
>> own using some override.
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