PREIN

/bin/sh

/usr/share/rpm-helper/add-user nginx $1 nginx /var/lib/nginx /bin/false

PREUN

/bin/sh

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

POSTIN

/bin/sh

/usr/share/rpm-helper/add-service nginx $1 nginx 
if [ -f /var/lock/subsys/nginx ]; then
    /etc/rc.d/init.d/nginx restart 1>&2;
fi

POSTUN

/bin/sh

/usr/share/rpm-helper/del-user nginx $1 nginx