$ git clone -n https://src.fedoraproject.org/rpms/vdr-live.git /var/lib/mock/f42-build-864185-172199/root/chroot_tmpdir/scmroot/vdr-live
Cloning into '/var/lib/mock/f42-build-864185-172199/root/chroot_tmpdir/scmroot/vdr-live'...
$ git fetch origin 470b9c2b25c87337d51950a903aaa069b5119148:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-live
 * [new ref]         470b9c2b25c87337d51950a903aaa069b5119148 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 470b9c2 Update to 3.3.11