#!/bin/sh

set -eu

umask 027

DESTDIR="/export/backup"
DATE="$(date +%Y-%m-%d)"

if [ ! -d "$DESTDIR" ]; then
    echo "ERR: MariaDB backup directory [${DESTDIR}] does not exist" 1>&2
    exit 1
fi

cd "$DESTDIR" && {
    find . -xdev -mindepth 2 -maxdepth 2 -type f -mtime +7 \
        -execdir rm -f -- {} \;
    find . -xdev -depth -mindepth 1 -maxdepth 1 -type d -empty \
        -execdir rmdir -- {} \;
}

DESTDIR="${DESTDIR}/${DATE}"
mkdir "$DESTDIR"

for db in $(mysql -e "show databases" -s) ; do
    case "$db" in
        Database|information_schema|performance_schema)
            continue
            ;;
    esac
    mysqldump -E --add-drop-table "$db" | gzip > "${DESTDIR}/${db}.${DATE}.gz"
done