From 846c232bd02c77f98ced2a972bc14b7cdb25f8c3 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Fri, 28 Mar 2025 20:14:19 +0100
Subject: [PATCH] fix: Check if serial is readable (#232)

---
 src/boot.sh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/boot.sh b/src/boot.sh
index 1fb847b..0f8d8fd 100644
--- a/src/boot.sh
+++ b/src/boot.sh
@@ -100,10 +100,11 @@ else
 fi
 
 SM_BIOS=""
+PS="/sys/class/dmi/id/product_serial"
 
-if [ -s "/sys/class/dmi/id/product_serial" ]; then
+if [ -s "$PS" ] && [ -r "$PS" ]; then
 
-  BIOS_SERIAL=$(</sys/class/dmi/id/product_serial)
+  BIOS_SERIAL=$(<"$PS")
   BIOS_SERIAL="${BIOS_SERIAL//[![:alnum:]]/}"
 
   if [ -n "$BIOS_SERIAL" ]; then