substituteAll: validate arguments

{ stdenvNoCC }:

args:

{ lib, stdenvNoCC }:

# see the substituteAll in the nixpkgs documentation for usage and constraints

args:

let

  # keep this in sync with substituteAll

  isInvalidArgName = x: builtins.match "^[a-z][a-zA-Z0-9_]*$" x == null;

  invalidArgs = builtins.filter isInvalidArgName (builtins.attrNames args);

in

  if invalidArgs == [] then

    stdenvNoCC.mkDerivation ({

      name = if args ? name then args.name else baseNameOf (toString args.src);

      builder = ./substitute-all.sh;

      preferLocalBuild = true;

      allowSubstitutes = false;

    } // args)

  else throw ''

    Argument names for `pkgs.substituteAll` must:

      - start with a lower case ASCII letter

      - only contain ASCII letters, digits and underscores

    Found invalid argument names: ${lib.concatStringsSep ", " invalidArgs}.

  ''