From 538e1616286edacb8a7458d46b98e64921738edc Mon Sep 17 00:00:00 2001
From: Ali Mirjamali <ali@mirjamali.com>
Date: Sun, 30 Jun 2024 21:51:35 +0330
Subject: [PATCH] qubes-dom0-update: prevent concurrent execution

fixes: https://github.com/QubesOS/qubes-issues/issues/6345
---
 dom0-updates/qubes-dom0-update | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/dom0-updates/qubes-dom0-update b/dom0-updates/qubes-dom0-update
index e23455e..3eb5d4e 100755
--- a/dom0-updates/qubes-dom0-update
+++ b/dom0-updates/qubes-dom0-update
@@ -41,6 +41,13 @@ if [ "$1" = "--help" ]; then
     exit
 fi
 
+exec 9>"/var/lock/qubes-dom0-update.lock"
+flock -n 9
+if [[ ${?} -ne 0 ]]; then
+    echo "Another instance of qubes-dom0-update is already running!"
+    exit 1
+fi
+
 PKGS=()
 YUM_OPTS=()
 UPDATEVM_OPTS=()