$ git clone -n https://src.fedoraproject.org/rpms/vdr-extrecmenung.git /var/lib/mock/f40-build-2234011-53388/root/chroot_tmpdir/scmroot/vdr-extrecmenung
Cloning into '/var/lib/mock/f40-build-2234011-53388/root/chroot_tmpdir/scmroot/vdr-extrecmenung'...
$ git fetch origin ac43a66895339b0b5f2380d3dd2a32d21e69f84a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-extrecmenung
 * [new ref]         ac43a66895339b0b5f2380d3dd2a32d21e69f84a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac43a66 Rebuilt for new VDR API version