Comment # 2 on bug 1204929 from Stefan Hundhammer

Thanks to snwint, we found out that it's the rpcbind package that normally
creates this user group in its pre-install script:


rpm -q rpcbind --scripts 

preinstall scriptlet (using /bin/sh):

if [ -x /usr/bin/systemctl ]; then
        for service in rpcbind.service rpcbind.socket ; do                      
                if [ ! -e "/usr/lib/systemd/system/$service" ]; then
                        mkdir -p /run/systemd/rpm/needs-preset
                        touch "/run/systemd/rpm/needs-preset/$service"
                fi
        done
fi
/usr/sbin/sysusers2shadow rpc-user.conf <<"EOF" || [ -f /.buildenv ]
u rpc - "User for rpcbind" /var/lib/empty
EOF

...
...


It's this part:

/usr/sbin/sysusers2shadow rpc-user.conf <<"EOF" || [ -f /.buildenv ]
u rpc - "User for rpcbind" /var/lib/empty
EOF