Nim dependency unable to be found

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#1

I am currently trying to create a flake for LibVFIO’s arcd tool which is written in Nim. I have a repo with a flake.nix added here. I originally manually packaged all the dependencies listed in libvfio.nimble, but after some trouble I switched to nimble2nix, which unfortunately didn’t help. With both methods, the build always fails with > /nix/store/cpydrynvv097qmldsn3wvp44n8ihmqx8-uuids-8cb8720/uuids.nim:2:8 Error: cannot open file: isaac.

Looking at the Nix store, I can see that isaac is building correctly, the same as the other modules. At the beginning of the build, the nix log outputs found nimble input /nix/store/kdh54arssp1cwi5ina26m01k5zp63vg5-isaac-45a5cbb.

I’m pretty unfamiliar with using Nim with NixOS, so if anybody can help I would greatly appreciate it.

#2

nimble2nix use pkgs.nimPackages.buildNimPackage that use nim_builder to interpret the nimble file of dependencies and discover the srcDir (default to project root), but Isaac, with his 180 years old, uses and speaks an archaic nimble format (was somekind of ini).

It means buildNimPackage thinks its content is at . instead of ./src
Options:

  1. fork Isaac, update nimble file, and your nimble2nix.json
  2. override adding replace isaac-0.1.3 to isaac-0.1.3/src in config.nims in postConfigure
  3. ask nimble2nix to accept other arguments like postConfigure in buildNimblePackage
  4. ask @ehmry to make nim_builder, read the older format.

My tests, needs cleanup:

        packages.default = 
          let buildNimblePackage = {
              pname,
              version,
              name ? "${pname}-${version}",
              src,
              deps ? src + "/nimble2nix.json",
              buildInputs ? [],
              nativeBuildInputs ? [],
            }:
            let 
              depsPkgs = 
                if builtins.pathExists deps then
                  pkgs.lib.mapAttrsToList (name: src:
                      buildNimblePackage {
                        inherit name;
                        pname   = null;
                        version = null;
                        src     = pkgs.fetchgit { inherit (src) url rev sha256 fetchSubmodules;};
                      }
                  ) (pkgs.lib.importJSON deps)
                  else [];
            in pkgs.nimPackages.buildNimPackage {
              inherit name src nativeBuildInputs;
              buildInputs   = buildInputs ++ depsPkgs;
              postConfigure = ''
                echo 
                echo NIX_NIM_BUILD_INPUTS $NIX_NIM_BUILD_INPUTS
                cat config.nims
                substituteInPlace config.nims \
                  --replace isaac-0.1.3 isaac-0.1.3/src
              '';
            };
          in buildNimblePackage {
            pname   = "arcd";
            version = "0.1";
            src     = ./.;
          };
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