From b25466656698c6c16d5530cd12de78a3ef1473b6 Mon Sep 17 00:00:00 2001
From: root <root@raspberrypi.(none)>
Date: Mon, 15 Oct 2012 03:19:55 +0100
Subject: [PATCH] prevented multiple instances from starting within 15 seconds.
 only one action is allowed within 15 seconds.

---
 door.sh | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/door.sh b/door.sh
index d78b2e8..a168b81 100755
--- a/door.sh
+++ b/door.sh
@@ -6,24 +6,29 @@ export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 OPEN_INDICATOR=/tmp/door_status_open
 CLOSED_INDICATOR=/tmp/door_status_closed
 
+if [ -f $OPEN_INDICATOR ]; then
+	LOCK_AGE=$(( $(date +%s)-$(stat -c %X $OPEN_INDICATOR) ))
+elif [ -f $CLOSE_INDICATOR ]; then
+	LOCK_AGE=$(( $(date +%s)-$(stat -c %X $CLOSED_INDICATOR) ))
+else
+	LOCK_AGE=15
+fi
+
+if [ $LOCK_AGE -lt 15 ]; then
+	echo "please wait at least 15 seconds befor a second run of this script" >&2
+	exit 1
+fi
+
 ./door_verify.sh
 STATUS=$?
 if [ $STATUS -eq 0 ]; then
 	echo "opening door"
 	if [ -f $OPEN_INDICATOR ]; then
-		if [ $(( $(date +%s)-$(stat -c %X $OPEN_INDICATOR) )) -lt 15 ]; then
-			echo "please wait at least 15 seconds befor a second run of this script" >&2
-			exit 1
-		fi
 		echo "closing door"
 		./door_lock.sh close
 		rm $OPEN_INDICATOR
 		touch $CLOSED_INDICATOR
 	else
-		if [ $(( $(date +%s)-$(stat -c %X $CLOSED_INDICATOR) )) -lt 15 ]; then
-                        echo "please wait at least 15 seconds befor a second run of this script" >&2
-                        exit 1
-                fi
 		echo "opening door"
 		./door_lock.sh open
 		rm $CLOSED_INDICATOR