#!/bin/bash
# mysql database backup.
# executed by duplicati run-script-before-required
# required environment variables:
#   DESTINATION
#   DB_HOST
#   DB_USER
#   DB_PASSWORD
#   DB_NAME 
# download directly from git
# curl  https://git.limbosolutions.com/kb/duplicati/raw/branch/main/docker/scripts/backupdb.sh > backupdb.sh | chmod +x backupdb.sh

#any error must stop execution
set -e

if [ $DUPLICATI__OPERATIONNAME != "Backup" ]
then
    echo "Not a backup operation. exiting!"
    #OK, run operation
    return 0
fi


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

TARGETFILENAME=${DB_NAME}_dump_$(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 ${DB_HOST} --user=${DB_USER} -p"${DB_PASSWORD}" ${DB_NAME} > /tmp/${TARGETFILENAME}


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

mv /tmp/${TARGETFILENAME} ${DB_BACKUP_TARGETFOLDER}/${TARGETFILENAME}
return 0