From: Alexander Barton <alex@barton.de>
Date: Wed, 19 Aug 2015 08:19:59 +0000 (+0200)
Subject: backup-script-wrapper: Check for PID file ("lock file")
X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=backup-script.git;a=commitdiff_plain;h=ffede769862d1526d8dfd4bde5548989f22d9792;ds=sidebyside

backup-script-wrapper: Check for PID file ("lock file")

Check for the existence of the PID and abort if if exists file before
redirecting the output to the log file, to not garble it when an other
instance is still running.
---

diff --git a/bin/backup-script-wrapper b/bin/backup-script-wrapper
index bb9009d..32a15a6 100755
--- a/bin/backup-script-wrapper
+++ b/bin/backup-script-wrapper
@@ -25,12 +25,23 @@ NAME="backup-script"
 DELIMITER="- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
 HOST=`hostname -f`
 LOGFILE="/var/log/$NAME.log"
+PIDFILE="/var/run/$NAME.pid"
 SUBJECT="$NAME results"
 TMP=`mktemp /tmp/$NAME.XXXXXXXX` || exit 1
 
 PATH="$PATH:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
 export PATH
 
+# check PID file ("lock file")
+if [ -e "$PIDFILE" ]; then
+	echo "Lockfile \"$PIDFILE\" already exists."
+	echo "Is an other instance still running?"
+	echo
+	echo -n "Aborted: "; date
+	echo
+	exit 4
+fi
+
 exec >"$TMP" 2>&1
 
 echo "$NAME Report"