check_drupal-cron

#!/bin/bash
NOW=$(date +%s)
RETVAL=3

if [ -x /usr/local/bin/drush ];then
  DRUSH='/usr/local/bin/drush'
elif [ -x /usr/bin/drush ];then 
  DRUSH='/usr/bin/drush'
else
  DRUSH=`which drush`
  if [ $? != 0 ]; then
    echo "UNKNOWN: Drush is not installed or it's not in PATH"
    RETVAL=3
    exit $RETVAL
  fi
fi

# Workaround for https://github.com/drush-ops/drush/issues/2183.
# On older Drush 8.x versions, .my.cnf has preference over settings.php,
# which causes `drush state-get system.cron_last` to fail.
if [[ -f "${HOME}/.my.cnf" ]]
then
  DRUSH_HOME="/tmp"
else
  DRUSH_HOME="${HOME}"
fi

while getopts u:r:c:w: o; do
    case "$o" in
        u)    uri="$OPTARG";;
        r)    root="$OPTARG";;
        w)    warning="$OPTARG";;
        c)    critical="$OPTARG";;
    esac
done

if [ -z $uri ] || [ -z $root ] || [ -z $warning ] || [ -z $critical ]; then
    echo "All the paramaters are required"; exit $RETVAL
fi

DRUPAL_VERSION=$(${DRUSH} --root=${root} --uri=${uri} status | grep 'Drupal version' | sed 's/.*:\s*//')

if [[ "$DRUPAL_VERSION" =~ ^[6-7] ]]
then
  # drupal 6/7
  LAST_CRON_RUN=$(HOME=${DRUSH_HOME} ${DRUSH} --root=${root} --uri=${uri} vget '^cron_last$'|cut -d: -f 2)
else
  # other drupal versions
  LAST_CRON_RUN=$(HOME=${DRUSH_HOME} ${DRUSH} --root=${root} --uri=${uri} state-get system.cron_last)
fi

DELTA=$(($NOW - $LAST_CRON_RUN))

#Check if Drush executed correctly
if [ $? != 0 ]; then
  echo "UNKNOWN: Drush didn't execute correctly"
  RETVAL=3
else
  #Check Critical threshold
  if [ $DELTA -gt ${critical} ]; then
    echo "CRITICAL: Cron ran $DELTA seconds ago"
    RETVAL=2
  #Check Warning threshold
  elif [ $DELTA -gt ${warning} ]; then
    echo "WARNING: Cron ran $DELTA seconds ago"
    RETVAL=1
  #Everything is normal
  else
    echo "OK: Cron ran $DELTA seconds ago"
    RETVAL=0
  fi
fi

exit $RETVAL