{ pkgs ? import ./nixpkgs.nix {} }:

let

  lib = pkgs.lib;

  executables = lib.concatLists
    (lib.mapAttrsToList
      # every package puts its binNames into passthru
      (_: v: map (bin: "${v}/bin/${bin}") v.passthru.binNames)
      (import ./default.nix { inherit pkgs; }));

  testExeLocation = pkgs.writers.writeDash "test-exe-location" ''
    set -e
    ERRORS=0;

    test_exe () {
      EXE=$1;
      echo "$EXE --version:"
      if $EXE --version; then
        return 0
      else
        echo "$EXE --version failed!"
        ERRORS=1
      fi
    }

    for exe in ${lib.escapeShellArgs executables}; do
      test_exe "$exe"
    done

    exit "$ERRORS"

  '';

in {
  inherit
    testExeLocation;
}