From 76405e3077eaf84e33fb61e11292d859fa1d0d9c Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Thu, 26 May 2022 07:06:13 +0000
Subject: [PATCH] compressFirmwareXz: fix with empty lib/firmware

Fixes: 8aa8e0ce7f1 ("nixos/udev: compress all firmware if supported")
---
 pkgs/build-support/kernel/compress-firmware-xz.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/kernel/compress-firmware-xz.nix b/pkgs/build-support/kernel/compress-firmware-xz.nix
index 56595131c89..6a797226aa6 100644
--- a/pkgs/build-support/kernel/compress-firmware-xz.nix
+++ b/pkgs/build-support/kernel/compress-firmware-xz.nix
@@ -7,7 +7,7 @@ runCommand "${firmware.name}-xz" {} ''
   (cd ${firmware} && find lib/firmware -type d -print0) |
       (cd $out && xargs -0 mkdir -v --)
   (cd ${firmware} && find lib/firmware -type f -print0) |
-      (cd $out && xargs -0tP "$NIX_BUILD_CORES" -n1 \
+      (cd $out && xargs -0rtP "$NIX_BUILD_CORES" -n1 \
           sh -c 'xz -9c -T1 -C crc32 --lzma2=dict=2MiB "${firmware}/$1" > "$1.xz"' --)
   (cd ${firmware} && find lib/firmware -type l) | while read link; do
       target="$(readlink "${firmware}/$link")"