#!/bin/bash

# mysql database backup.
# executed by duplicati run-script-before-required
# required environment variables:

#   MYSQL_HOST
#   MYSQL_USER
#   MYSQL_PASSWORD
#   MYSQL_DATABASE 
#   MYSQL_BACKUP_FOLDER

#any error must stop execution
set -e

if [ -f "/etc/default/duplicati-mysql" ]; then
export $(cat /etc/default/duplicati-mysql)
fi

if [ -f "~/.config/duplicati-mysql" ]; then
export $(cat ~/default/duplicati-mysql)
fi


if [ $DUPLICATI__OPERATIONNAME == "Backup" ]
then
   echo "Backup Job!!"
else
    echo "Not a backup operation. exiting!"
    #OK, run operation
    exit
fi

if [ -z "$MYSQL_BACKUP_FOLDER" ]; then
   MYSQL_BACKUP_FOLDER="/var/db-dumps"
fi

if [ ! -d $MYSQL_BACKUP_FOLDER ]; then
   mkdir -p $MYSQL_BACKUP_FOLDER;
fi

TARGETFILENAME=${MYSQL_DATABASE}_dump_$(date -d "today" +"%Y%m%d%H%M%S").sql 
echo "dump file name:$TARGETFILENAME"

if [ -f /tmp/${TARGETFILENAME} ]
then
    rm /tmp/${TARGETFILENAME}
fi


mysqldump -h ${MYSQL_HOST} --user=${MYSQL_USER} -p"${MYSQL_PASSWORD}" ${MYSQL_DATABASE} > /tmp/${TARGETFILENAME}


if [ x$(find "$MYSQL_BACKUP_FOLDER" -prune -empty) = x"$MYSQL_BACKUP_FOLDER" ]; then
    echo "folder is empty... ignoring clean db dump folder"
else
    rm -r ${MYSQL_BACKUP_FOLDER}/* 
fi

mv /tmp/${TARGETFILENAME} ${MYSQL_BACKUP_FOLDER}/${TARGETFILENAME}