PREIN

/bin/sh

getent group etcd >/dev/null || groupadd -r etcd
getent passwd etcd >/dev/null || useradd -r -g etcd -d /var/lib/etcd \
    -s /sbin/nologin -c "etcd user" etcd

PREUN

/bin/sh

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

POSTIN

/bin/sh

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