In reply to @purepani:matrix.org
I am not sure what this error is, but I think it's a different issue. That being said, I don't remember if nix-shell passes environement variables through by default or not, so maybe try updating the package update script to expose that environment variable?

Hello, I don't know if this is the right place to ask but I have been trying to figure out an issue for quite a long time without any luck. I made a nix flake to build my F# project and I can't get it to build with nix build. I get errors like the following:

Hello, I don't know if this is the right place to ask but I have been trying to figure out an issue for quite a long time without any luck. I made a nix flake to build my F# project and I can't get it to build with nix build. I get errors like the following:

error NU1101: Unable to find package runtime.any.System.Reflection. No packages exist with this id in source(s): /nix/store/kph077ikp1bvzw4yc4yxa3rnps6rn0r0-dotnet-sdk-8.0.300/sdk/8.0.300/FSharp/library-packs, nugetSource [/private/tmp/nix-build-inventory-backend-20240628.drv-0/backend/backend.sln]

I did manage to generate a deps.nix that contains a line like this:

(fetchNuGet { pname = "System.Reflection"; version = "4.3.0"; sha256 = "0xl55k0mw8cd8ra6dxzh974nxif58s3k1rjv1vbd7gjbjr39j11m"; })

and my flake definition looks (partially) like this:

      packages = forAllSystems (system:
        let
          pkgs = nixpkgsFor.${system};
        in {
          default = pkgs.buildDotnetModule rec {
            pname = "inventory-backend";
            inherit version;

            src = ./backend;
            projectFile = "backend.sln";

            # To generate deps.nix:
            #
            # nix develop
            # dotnet restore backend/ --packages out
            # nuget-to-nix out > deps.nix
            nugetDeps = ./deps.nix;

            dotnet-sdk = pkgs.dotnet-sdk_8;

            packNupkg = true;
          };
        });

I managed to solve this by first setting packNupkg = false in the flake file then regenerating dependencies like:

rm ./deps.nix
touch ./deps.nix
nix build .#default.passthru.fetch-deps
./result deps.nix

Afterwards, nix build worked fine

Here is what the definition looks like now, for reference:

      packages = forAllSystems (system:
        let
          pkgs = nixpkgsFor.${system};
        in {
          default = pkgs.buildDotnetModule rec {
            pname = "inventory-backend";
            inherit version;

            src = ./backend;
            projectFile = "backend.sln";

            # To generate deps.nix:
            #
            # nix develop
            # dotnet restore backend/ --packages out
            # nuget-to-nix out > deps.nix
            # OR
            # nix build .#default.passthru.fetch-deps
            nugetDeps = ./deps.nix;

            dotnet-sdk = pkgs.dotnet-sdk_8;
            dotnet-runtime = pkgs.dotnet-aspnetcore_8;

            packNupkg = false;
          };
        });