#!/bin/bash
# https://mariadb.com/kb/en/incremental-backup-and-restore-with-mariabackup/
set -e

myDir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
. "$myDir/config.sh"

todayDir="$(date +%Y-%m-%d)"
todayPath="$historyDir/$todayDir"

pattern="$todayPath/${todayDir}_??-??_full.xb.gz.enc"
files=($pattern)
backupFile="${files[0]}"
backupBase=$(basename -- "$backupFile")
backupName="${backupBase%%.*}"

incrementalName="${todayDir}_$(date +"%H-%M")_incremental"
incrementalFile="$backupDir/${incrementalName}.xb.gz.enc"

ulimit -n 24098
mariabackup \
	--defaults-extra-file="$myDir/my.cnf" \
	--backup \
	--incremental-basedir="$backupDir/$backupName" \
	--extra-lsndir="$backupDir/$incrementalName" \
	--incremental-history-name="$todayDir" \
	2>> "$logFile" \
	| gzip \
	| openssl enc -aes-256-cbc -pbkdf2 -kfile "$myDir/xbcrypt.key" \
	> "$incrementalFile"

if [ $? != "0" ]; then
	echo "An error ocurred during backup, please take a look at log file: $logFile"
	exit 1
fi

cp "$incrementalFile" "$todayPath"
cp -r "$backupDir/$incrementalName" "$todayPath"