From 0342049ffb4a8ea1f1816d62a50e5aab013e4b45 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Mon, 24 Mar 2025 12:02:10 +0100
Subject: [PATCH] Update boot.sh

---
 src/boot.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/boot.sh b/src/boot.sh
index 09634aa..57fdfe3 100644
--- a/src/boot.sh
+++ b/src/boot.sh
@@ -88,7 +88,7 @@ if [ ! -f "$CLOCK" ]; then
   warn "file \"$CLOCK\" cannot not found?"
 else
   result=$(<"$CLOCK")
-  case "${result,,}" in
+  case "${result//[^[:alpha:]_- ]/}" in
     "${CLOCKSOURCE,,}" ) ;;
     "kvm-clock" ) info "Nested KVM virtualization detected.." ;;
     "hyperv_clocksource_tsc_page" ) info "Nested Hyper-V virtualization detected.." ;;