I’d like to build an application using the versions specified in a cabal.config file (cabal-install is included in the shell.nix file). Is there an easy way to do it?
After talking to people on #nixos, I got the impression that having your own Nixpkgs branch is the only way if you want to share your environment with NixOS and plain Nix users. Parsing a cabal.config file and running cabal2nix on every package is not difficult. But where do I need to put the new recipes? For packages with the default.nix file, you just compare the versions and replace the existing recipe if they don’t match. For packages having multiple versions, you also need to change pkgs/top-level/haskell-packages.nix. The latter makes me a bit uncomfortable because it’s easy to make a mistake. I’d rather put all the new recipes in a different place, say, in the directory of my application, and somehow instruct Nix to use them first. Can it be done? Or is there a better way?
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