#!/bin/bash
# mysql database backup.
# executed by duplicati run-script-before-required
# required environment variables:
#   DESTINATION
#   MYSQL_HOST
#   MYSQL_USER
#   MYSQL_PASSWORD
#   MYSQL_DATABASE 

#any error must stop execution
set -e

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


if [ -z ${DESTINATION} ]
then
      echo "\$DESTINATION environment variable cannot be empty empty"
      #5: Error don't run operation
      exit 5
fi

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

mv /tmp/${TARGETFILENAME} ${DESTINATION}/${TARGETFILENAME}