PREIN

/bin/sh

getent group ow >/dev/null || groupadd -r ow
getent passwd ow >/dev/null || \
    useradd -r -g ow -d /var/empty -s /sbin/nologin \
    -c "1-wire file-system (OWFS) utilities account" ow
exit 0

PREUN

/bin/sh

%systemd_preun owserver.service

POSTIN

/bin/sh

%systemd_post owserver.service

POSTUN

/bin/sh

%systemd_postun_with_restart owserver.service