PREIN

/bin/sh

getent group guacd >/dev/null || groupadd -r guacd &>/dev/null || :
getent passwd guacd >/dev/null || useradd -r -s /sbin/nologin \
    -d /var/lib/guacd -M -c 'Guacamole proxy daemon' -g guacd guacd &>/dev/null || :
exit 0

PREUN

/bin/sh

/usr/share/rpm-helper/del-service guacd $1 guacd

POSTIN

/bin/sh

/usr/share/rpm-helper/add-service guacd $1 guacd