Nagios/Icinga Apple Time machine check

check_time_machine.sh

#!/bin/sh

# based on: https://www.reddit.com/r/macsysadmin/comments/6jvsyx/finding_date_of_last_time_machine_backup_in/djind3p/ and original post
# if mac os >= 10.9 pathPlistNew="/Library/Preferences/com.apple.TimeMachine.plist"
# otherwise it's pathPlistOld="/private/var/db/.TimeMachine.Results.plist

EXIT_OK=0;
EXIT_WARNING=1;
EXIT_CRITICAL=2;
EXIT_UNKNOWN=3;

WARN=$1
CRIT=$2

enabled=`/usr/bin/defaults read /Library/Preferences/com.apple.TimeMachine AutoBackup`

macOS=$(sw_vers | awk '/ProductVersion/{print substr($2,1,5)}' | tr -d ".")
pathPlistNew="/Library/Preferences/com.apple.TimeMachine.plist"
pathPlistOld="/private/var/db/.TimeMachine.Results.plist"

if [ "$macOS" -ge "109" ]; then

  pathPlist=$pathPlistNew

else

  pathPlist=$pathPlistOld

fi

if [ "$enabled" == "1" ];then
  now=`date -j -f "%a %b %d %T %Z %Y" "$(date)" "+%s"`

  lastBackupTimestamp=`date -j -f "%a %b %d %T %Z %Y" "$(/usr/libexec/PlistBuddy -c "Print Destinations:0:SnapshotDates" $pathPlist | tail -n 2 | head -n 1 | awk '{$1=$1};1')" "+%s"`

  lastBackupFormattedTime=$(date -j -f "%s" $lastBackupTimestamp "+%Y-%m-%d %H:%M:%S")

  delta=$(expr $now - $lastBackupTimestamp)

  if [ $delta -gt $CRIT ]; then

    echo "CRITICAL - latest backup: $lastBackupFormattedTime"
    exit $EXIT_CRITICAL

  elif [ $delta -gt $WARN ]; then

    echo "WARNING - latest backup: $lastBackupFormattedTime"
    exit $EXIT_WARNING

  else

    echo "OK - latest backup: $lastBackupFormattedTime"
    exit $EXIT_OK

  fi

else

  echo "UNKNOWN - TM Disabled"
  exit $EXIT_UNKNOWN
  
fi