post_install() {
    oacs_service=oacs-5-9
    oacs_dir=/usr/lib/openacs
    db_name=${oacs_service}
    ns_install_dir=/usr/lib/naviserver
    #if postgres is not running, start it
    if pgrep "postgres" > /dev/null 
    then
        echo "Postgres is running"
    else
        echo "Postgres is not running and will be started"
        /usr/bin/systemctl start postgresql
    fi
    
    #create user and group, we should have them from naviserver installation
    oacs_user=nsadmin
    oacs_group=nsadmin
    group_listcmd="grep ${oacs_group} /etc/group"
    group=$(eval ${group_listcmd})
    group_addcmd="groupadd ${oacs_group}"
    oacs_user_addcmd="useradd -g ${oacs_group} ${oacs_user}"
    if [ "x$group" = "x" ] ; then
        eval ${group_addcmd}
    fi

    if ! id -u $oacs_user > /dev/null 2>&1; then
        eval ${oacs_user_addcmd}
    fi
    chown -R ${oacs_user}:${oacs_group} ${oacs_dir} &> /dev/null

    #setup database (we create a user and a db)
    /usr/bin/createuser -U postgres -a -d ${oacs_user}
    /usr/bin/createdb -U postgres -E UNICODE ${db_name}
    /usr/bin/psql -U postgres -d ${db_name} -tAc "create extension hstore"

echo "
Congratulations, you have installed OpenACS with NaviServer on your machine.
You might start the server manually with

    sudo /usr/bin/nsd -t /etc/naviserver/config-oacs-5.9.0.tcl -u ${oacs_user} -g ${oacs_group}"

echo "
To use OpenACS, point your browser to http://localhost:8000/
The configuration file is /etc/naviserver/config-oacs-5.9.0.tcl
and might be tailored to your needs. The access.log and error.log of
this instance are in ${oacs_dir}/log

"

}