In reply to @blaggacao:matrix.org

Hi Zhaofeng Li !

I beleive colmena eval was only ever made to be impure (so the --impure option might be a mistake), see builtins.currentSystem in:

    introspect = f:
      f {
        lib = nixpkgs.lib // builtins;
        pkgs = nixpkgs.legacyPackages.${builtins.currentSystem};
        nodes = l.mapAttrs (evalNode {_module.check = false;}) comb;
      };