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#!/bin/sh

FILENAME=$(basename $0 .sh)
BACKUP_TS=$(date +%F-%T)
ARCHIVE=${FILENAME}_${BACKUP_TS}.tar.gz
ERRFILE=${FILENAME}_${BACKUP_TS}.err
DMPFILE=${FILENAME}_${BACKUP_TS}.dmp
LOG_DIR=/tmp
BACKUP_WORKDIR=/tmp
BACKUP_ARCHIVEDIR=/tmp
MARIADB_BACKUP_EXE_DIR="/usr/bin"
DB_USER=backup
DB_PWD=******
HOST=host.docker.internal
PORT=3355

# cleanup old backups
removeOldBackups()
{
# remove backups older than -mmin for minutes, -mtime for days
for i in `find $BACKUP_ARCHIVEDIR/*.tar.gz $BACKUP_ARCHIVEDIR/*.dmp $BACKUP_ARCHIVEDIR/*.err \
          2>/dev/null -type f -mmin +60 -ls | grep -o '\S\+$'`
do
        rm $i >/dev/null 2>/dev/null
done
}

cd /

echo "Backup Started"

# call backup utility
{
"$MARIADB_BACKUP_EXE_DIR"/mysqldump --all-databases --host=$HOST --port=$PORT \
                                    --user=$DB_USER --password=$DB_PWD \
                                    --log-error=/tmp/$ERRFILE  > /tmp/$DMPFILE
}
echo >&2 "Backup Complete"

# create a tar archive from the backup directory
tar cvzf $BACKUP_ARCHIVEDIR/$ARCHIVE $BACKUP_WORKDIR/$DMPFILE \
         $BACKUP_WORKDIR/$ERRFILE >/dev/null 2>/dev/null

# check for errors
if [ -s "$BACKUP_WORKDIR/$ERRFILE" ]
then
   rm $BACKUP_ARCHIVEDIR/$ARCHIVE >/dev/null 2>/dev/null
   exit 1
else
   rm $BACKUP_WORKDIR/$DMPFILE \
      $BACKUP_WORKDIR/$ERRFILE >/dev/null 2>/dev/null
   removeOldBackups
   exit 0
fi