post_install() {
    if ! getent group monetdb > /dev/null; then
        groupadd --system monetdb
    fi

    if ! getent passwd monetdb > /dev/null; then
        useradd --system -c 'MonetDB user' -g monetdb -d '/var/MonetDB' -s /sbin/nologin monetdb
        passwd -l monetdb &> /dev/null
    fi

    mkdir -p /var/monetdb5/dbfarm
    chown monetdb:monetdb /var/monetdb5 /var/monetdb5/dbfarm
    chmod ug=rwx,g+s,o= /var/monetdb5 /var/monetdb5/dbfarm

    mkdir -p /var/log/monetdb /var/run/monetdb
    chown monetdb:monetdb /var/log/monetdb /var/run/monetdb
    chmod ug=rwx,o= /var/log/monetdb
    chmod ug=rwx,o=rx /var/run/monetdb
}

post_upgrade() {
    post_install
}