stack build error: attribute ‘ghc822’ missing, at (string):1:53

Question

I am attempting to build my haskell project on NixOS.

Running $ stack build gives the following error.

$ stack build
error: attribute ‘ghc82         


        

Answer 1

based on @steve-chávez answer

stack.yaml

resolver: lts-13.19
system-ghc: true
install-ghc: false

nix:
  enable: true
  path: [nixpkgs=./nix/nixpkgs/default.nix]
  shell-file: shell.nix

nix/nixpkgs/default.nix

let
  spec = builtins.fromJSON (builtins.readFile ./revision.json);

  src = import  {
    url = "https://github.com/${spec.owner}/${spec.repo}/archive/${spec.rev}.tar.gz";
    inherit (spec) sha256;
  };
  nixcfg = import ;

  nixpkgs = builtins.derivation {
    system = builtins.currentSystem;
    name = "${src.name}-unpacked";
    builder = builtins.storePath nixcfg.shell;
    inherit src;
    args = [
      (builtins.toFile "builder" ''
        $coreutils/mkdir $out
        cd $out
        $gzip -d < $src | $tar -x --strip-components=1
      '')
    ];
    coreutils = builtins.storePath nixcfg.coreutils;
    tar = builtins.storePath nixcfg.tar;
    gzip = builtins.storePath nixcfg.gzip;
  };
in
  import nixpkgs

nix/nixpkgs/update.sh

#!/usr/bin/env nix-shell
#!nix-shell -i bash -p nix curl jq

SCRIPT_DIR=$(dirname "$(readlink -f "$BASH_SOURCE")")

owner="nixos"
repo="nixpkgs-channels"
rev="nixos-unstable"

full_rev=$(curl --silent https://api.github.com/repos/$owner/$repo/git/refs/heads/$rev | jq -r .object.sha)

echo "full_rev=$full_rev"

expected_sha=$(nix-prefetch-url https://github.com/$owner/$repo/archive/$full_rev.tar.gz)

cat >"$SCRIPT_DIR/revision.json" <

shell.nix

{
  #
  # there are 2 ways of using stack with nix
  # - define custom packages in `stack.yaml` `packages` option (https://docs.haskellstack.org/en/stable/nix_integration/#additions-to-your-stackyaml)
  # - define custom package in `shell.nix` AND `shell-file: ...` in `stack.yaml` (https://docs.haskellstack.org/en/stable/nix_integration/#additions-to-your-stackyaml)
  #
  # we are using second option

  ghc # stack expect this file to define a function of exactly one argument that should be called ghc
}:


let
  # pkgs = import ./nix/nixpkgs/default.nix {}
  pkgs = import  {};
in

with pkgs;

haskell.lib.buildStackProject {
  inherit ghc;
  name = "myEnv";
  buildInputs = [ cabal-install ];
}