change how telegraf script determine if there is already and instance of the script already running

salt/telegraf/scripts/raid.sh

@@ -15,17 +15,18 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-THEGREP=$(ps -ef | grep $0 | grep -v $$ | grep -v grep)
-RAIDLOG=/var/log/raid/status.log
-RAIDSTATUS=$(cat /var/log/raid/status.log)
+# if this script isn't already running
+if [[ ! "`pidof -x $(basename $0) -o %PPID`" ]]; then
 
-if [ ! "$THEGREP" ]; then
+    RAIDLOG=/var/log/raid/status.log
+    RAIDSTATUS=$(cat /var/log/raid/status.log)
 
     if [ -f "$RAIDLOG" ]; then
         echo "raid $RAIDSTATUS"
     else
         exit 0
     fi
-else
-    exit 0
+
 fi
+
+exit 0