$ git clone -n https://github.com/xcp-ng-rpms/iputils.git /var/lib/mock/v8.3-incoming-9069-27920/root/chroot_tmpdir/scmroot/iputils
Cloning into '/var/lib/mock/v8.3-incoming-9069-27920/root/chroot_tmpdir/scmroot/iputils'...
$ git fetch origin ff2ed5168c6aca46e000d84d53dccefab95546dd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/iputils
 * [new ref]         ff2ed5168c6aca46e000d84d53dccefab95546dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff2ed51 Import iputils-20160308-11.xs8.src.rpm