From 7baf5a984d40618abc1a53de6c678d2ba8cd7bbe Mon Sep 17 00:00:00 2001
From: Luna Nova <git@lunnova.dev>
Date: Sat, 11 Oct 2025 15:32:42 -0700
Subject: [PATCH] rocmPackages.hipblaslt: verify .dat files aren't huge in
 preInstallCheck

let's avoid regressing compression in future, oops
---
 .../rocm-modules/6/hipblaslt/default.nix           | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/rocm-modules/6/hipblaslt/default.nix b/pkgs/development/rocm-modules/6/hipblaslt/default.nix
index 61328d5cd867..e8061a50b92f 100644
--- a/pkgs/development/rocm-modules/6/hipblaslt/default.nix
+++ b/pkgs/development/rocm-modules/6/hipblaslt/default.nix
@@ -125,7 +125,7 @@ stdenv.mkDerivation (finalAttrs: {
   '';
 
   doCheck = false;
-  doInstallCheck = false;
+  doInstallCheck = true;
 
   nativeBuildInputs = [
     cmake
@@ -213,6 +213,18 @@ stdenv.mkDerivation (finalAttrs: {
       rmdir $out/bin
     '';
 
+  installCheckPhase =
+    # Verify compression worked and .dat files aren't huge
+    ''
+      runHook preInstallCheck
+      find "$out" -type f -name "*.dat" -size "+2M" -exec sh -c '
+          echo "ERROR: oversized .dat file, check for issues with install compression: {}" >&2
+          exit 1
+      ' {} \;
+      echo "Verified .dat files in $out are not huge"
+      runHook postInstallCheck
+    '';
+
   # If this is false there are no kernels in the output lib
   # supporting the target device
   # so if it's an optional dep it's best to not depend on it