From 2ec06a51a084b24c52d73e1c9aedaf6cca8f87d1 Mon Sep 17 00:00:00 2001
From: DavHau <hsngrmpf+github@gmail.com>
Date: Fri, 13 Dec 2024 00:39:12 +0700
Subject: [PATCH] make-ext4-fs: enable parallel compression for zstd

... as done in a couple of other image builders already
---
 nixos/lib/make-ext4-fs.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/lib/make-ext4-fs.nix b/nixos/lib/make-ext4-fs.nix
index 5aa90aacf72e..113ca0c1420f 100644
--- a/nixos/lib/make-ext4-fs.nix
+++ b/nixos/lib/make-ext4-fs.nix
@@ -102,7 +102,7 @@ pkgs.stdenv.mkDerivation {
 
     if [ ${builtins.toString compressImage} ]; then
       echo "Compressing image"
-      zstd -v --no-progress ./$img -o $out
+      zstd -T$NIX_BUILD_CORES -v --no-progress ./$img -o $out
     fi
   '';
 }