#!/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=$(date '+%Y_%m_%d')
BACKUPDIR=/nsm/backup
BACKUPFILE="$BACKUPDIR/so-postgres-backup-$TODAY.sql.gz"
MAXBACKUPS=7

mkdir -p $BACKUPDIR

# Skip if already backed up today
if [ -f "$BACKUPFILE" ]; then
  exit 0
fi

# Skip if container isn't running
if ! docker ps --format '{{.Names}}' | grep -q '^so-postgres$'; then
  exit 0
fi

# Dump all databases and roles, compress
docker exec so-postgres pg_dumpall -U postgres | gzip > "$BACKUPFILE"

# Retention cleanup
NUMBACKUPS=$(find $BACKUPDIR -type f -name "so-postgres-backup*" | wc -l)
while [ "$NUMBACKUPS" -gt "$MAXBACKUPS" ]; do
  OLDEST=$(find $BACKUPDIR -type f -name "so-postgres-backup*" -printf '%T+ %p\n' | sort | head -n 1 | awk -F" " '{print $2}')
  rm -f "$OLDEST"
  NUMBACKUPS=$(find $BACKUPDIR -type f -name "so-postgres-backup*" | wc -l)
done