jenkins init fixes

jenkins-packer-demo/scripts/jenkins-init.sh

@@ -5,6 +5,16 @@ vgchange -ay
 
 DEVICE_FS=`blkid -o value -s TYPE ${DEVICE}`
 if [ "`echo -n $DEVICE_FS`" == "" ] ; then 
+  # wait for the device to be attached
+  DEVICENAME=`echo "${DEVICE}" | awk -F '/' '{print $3}'`
+  DEVICEEXISTS=''
+  while [[ -z $DEVICEEXISTS ]]; do
+    echo "checking $DEVICENAME"
+    DEVICEEXISTS=`lsblk |grep "$DEVICENAME" |wc -l`
+    if [[ $DEVICEEXISTS != "1" ]]; then
+      sleep 15
+    fi
+  done
   pvcreate ${DEVICE}
   vgcreate data ${DEVICE}
   lvcreate --name volume1 -l 100%FREE data