#!/bin/bash
#
# Copyright Security Onion Solutions LLC and/or licensed to Security Onion Solutions LLC under one
# or more contributor license agreements. Licensed under the Elastic License 2.0 as shown at 
# https://securityonion.net/license; you may not use this file except in compliance with the
# Elastic License 2.0.

. /usr/sbin/so-common

TODAY=$(date '+%Y_%m_%d')
BACKUPDIR={{ DESTINATION }}
BACKUPFILE="$BACKUPDIR/so-config-backup-$TODAY.tar"
MAXBACKUPS=7
EXCLUSIONS=(
  "--exclude=/opt/so/saltstack/local/salt/elasticfleet/files/so_agent-installers"
)


# Create backup dir if it does not exist
mkdir -p /nsm/backup

# If we haven't already written a backup file for today, let's do so
if [ ! -f $BACKUPFILE ]; then

  # Create empty backup file
  tar -cf $BACKUPFILE -T /dev/null

  # Loop through all paths defined in global.sls, and append them to backup file
  {%- for LOCATION in BACKUPLOCATIONS %}
  tar -rf $BACKUPFILE "${EXCLUSIONS[@]}" {{ LOCATION }}
  {%- endfor %}

fi

# Find oldest backup files and remove them
NUMBACKUPS=$(find /nsm/backup/ -type f -name "so-config-backup*" | wc -l)
while [ "$NUMBACKUPS" -gt "$MAXBACKUPS" ]; do
  OLDESTBACKUP=$(find /nsm/backup/ -type f -name "so-config-backup*" -type f -printf '%T+ %p\n' | sort | head -n 1 | awk -F" " '{print $2}')
  rm -f $OLDESTBACKUP
  NUMBACKUPS=$(find /nsm/backup/ -type f -name "so-config-backup*" | wc -l)
done