PREIN

/bin/sh

getent group derby >/dev/null || groupadd -r derby
getent passwd derby >/dev/null || \
    useradd -r -g derby -d /var/lib/derby -s /sbin/nologin \
    -c "Apache Derby service account" derby
exit 0

PREUN

/bin/sh

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

POSTIN

/bin/sh

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