From 8cbdd0ac4d7f720d2be561a99ea9361cc001fd0c Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 23 Jun 2026 04:27:39 +0000
Subject: [PATCH] Fix unset DISABLE_UPDATE handling in build prompt guard

---
 misc/build.func | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/misc/build.func b/misc/build.func
index a04d76fb1..ec501e50a 100644
--- a/misc/build.func
+++ b/misc/build.func
@@ -5722,7 +5722,7 @@ create_lxc_container() {
       return 0
     fi
 
-    if [[ "${PHS_SILENT:-0}" == "1" || "${DISABLE_UPDATE,,}" == "yes" ]]; then
+    if [[ "${PHS_SILENT:-0}" == "1" || "${DISABLE_UPDATE:-}" =~ ^([Yy][Ee][Ss])$ ]]; then
       msg_info "Skipping host LXC stack upgrade prompt (unattended mode)"
       return 2
     fi