flake.nix

{
  description = "A very basic flake";

  outputs = { self, nixpkgs }: {

    devShells.x86_64-linux.default = with nixpkgs.legacyPackages.x86_64-linux; mkShell {
      shellHook = ''
        read FLAKE_ROOT < <(
          ${lib.getExe nix} flake metadata --json | ${lib.getExe jq} .locked.path --raw-output
        )
        export FLAKE_ROOT
      '';
    };

  };
}