llama-cpp: run update script only for the main package (#563932)

pkgs/by-name/ll/llama-cpp/package.nix

@@ -205,12 +205,16 @@ effectiveStdenv.mkDerivation (finalAttrs: {
   # the tests are failing as of 2025-08
   doCheck = false;
 
-  passthru = {
+  passthru = lib.optionalAttrs (!cudaSupport && !rocmSupport && !vulkanSupport) {
     updateScript = ./update.sh;
   };
 
   meta = {
-    description = "Inference of Meta's LLaMA model (and others) in pure C/C++";
+    description =
+      "Inference of Meta's LLaMA model (and others) in pure C/C++"
+      + optionalString cudaSupport ", with CUDA support"
+      + optionalString rocmSupport ", with ROCm support"
+      + optionalString vulkanSupport ", with Vulkan support";
     homepage = "https://github.com/ggml-org/llama.cpp";
     license = lib.licenses.mit;
     mainProgram = "llama";

pkgs/by-name/ol/ollama/package.nix

@@ -383,9 +383,10 @@ goBuild (finalAttrs: {
       service-rocm = nixosTests.ollama-rocm;
       service-vulkan = nixosTests.ollama-vulkan;
     };
-    updateScript = ./update.sh;
   }
-  // lib.optionalAttrs (!enableRocm && !enableCuda && !enableVulkan) { updateScript = ./update.sh; };
+  // lib.optionalAttrs (!rocmRequested && !cudaRequested && !vulkanRequested) {
+    updateScript = ./update.sh;
+  };
 
   meta = {
     description =