tests/emulators: fix download_emulators script

tests/download_emulators.sh

@@ -9,7 +9,5 @@ wget -e robots=off --no-verbose --no-clobber --no-parent --cut-dirs=2 --no-host-
 
 chmod u+x emulators/trezor-emu-*
 
-if [ -f /etc/NIXOS ]; then
+# are we in Nix(OS)?
-  # for this to work you need to run ./download_emulators.sh outside the main nix shell
+command -v nix-shell >/dev/null && nix-shell -p autoPatchelfHook SDL2 SDL2_image --run "autoPatchelf emulators/trezor-emu-*"
-  cd emulators && nix-shell --run "autoPatchelf trezor-emu*"
-fi

tests/emulators/.gitignore

@@ -1,3 +1 @@
-*
+trezor-emu-*
-!shell.nix
-!.gitignore

tests/emulators/shell.nix

@@ -1,10 +0,0 @@
-with import <nixpkgs> {};
-
-stdenv.mkDerivation {
-  name = "trezor-patch-emulators";
-  buildInputs = [
-    autoPatchelfHook
-    SDL2
-    SDL2_image
-  ];
-}