From 84f20951b32b8652c3fce37c23d795583718ac84 Mon Sep 17 00:00:00 2001
From: Dirk Brenken <dev@brenken.org>
Date: Thu, 26 Nov 2020 22:39:15 +0100
Subject: [PATCH] travelmate: fix possible race condition

* prevent possible duplicate script execution due to
  multiple ntp events in parallel

Signed-off-by: Dirk Brenken <dev@brenken.org>
---
 net/travelmate/Makefile                     |  2 +-
 net/travelmate/files/travelmate_ntp.hotplug | 14 +++++++++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/net/travelmate/Makefile b/net/travelmate/Makefile
index 1f9935466..c74a33a08 100644
--- a/net/travelmate/Makefile
+++ b/net/travelmate/Makefile
@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=travelmate
 PKG_VERSION:=2.0.2
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 PKG_LICENSE:=GPL-3.0-or-later
 PKG_MAINTAINER:=Dirk Brenken <dev@brenken.org>
 
diff --git a/net/travelmate/files/travelmate_ntp.hotplug b/net/travelmate/files/travelmate_ntp.hotplug
index 4a31d5946..2a215e4ba 100755
--- a/net/travelmate/files/travelmate_ntp.hotplug
+++ b/net/travelmate/files/travelmate_ntp.hotplug
@@ -22,10 +22,14 @@ f_log()
 	fi
 }
 
-if [ "${ACTION}" = "stratum" ] && [ ! -f "${trm_ntpfile}" ] && \
-	[ "$("${trm_init}" enabled; printf "%u" ${?})" = "0" ]
+if [ "${ACTION}" = "stratum" ] && [ ! -f "${trm_ntpfile}" ] && [ "$("${trm_init}" enabled; printf "%u" ${?})" = "0" ]
 then
-	> "${trm_ntpfile}"
-	f_log "info" "get ntp time sync"
-	"${trm_init}" restart
+	{
+		flock -xn 1001
+		if [ "$?" = "0" ]
+		then
+			f_log "info" "get ntp time sync"
+			"${trm_init}" restart
+		fi
+	} 1001>"${trm_ntpfile}"
 fi