flake.nix

{
  description = "python development environment";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
  };

  outputs =
    { self, nixpkgs, ... }@inputs:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
    in
    {
      devShells.x86_64-linux.default = pkgs.mkShell {
        venvDir = "./venv";
        buildInputs = [ pkgs.bashInteractive ];
        nativeBuildInputs = with pkgs; [
          python312
          python312Packages.venvShellHook
        ];

        shellHook = '''';

        # Run this command, only after creating the virtual environment
        postVenvCreation = ''
          unset SOURCE_DATE_EPOCH
          pip install -r requirements.txt
        '';

        # Now we can execute any commands within the virtual environment.
        # This is optional and can be left out to run pip manually.
        postShellHook = ''
          # allow pip to install wheels
          unset SOURCE_DATE_EPOCH
        '';
      };
    };
}