$ git clone -n https://src.fedoraproject.org/rpms/vdr-tvguide.git /var/lib/mock/f42-build-864199-172199/root/chroot_tmpdir/scmroot/vdr-tvguide
Cloning into '/var/lib/mock/f42-build-864199-172199/root/chroot_tmpdir/scmroot/vdr-tvguide'...
$ git fetch origin fd05d27aee9c734b1e2854ba5a4ca676e1f656a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-tvguide
 * [new ref]         fd05d27aee9c734b1e2854ba5a4ca676e1f656a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd05d27 Rebuilt for new VDR API version 2.7.2