$ git clone -n https://src.fedoraproject.org/rpms/vdr.git /var/lib/mock/f40-build-2234005-53388/root/chroot_tmpdir/scmroot/vdr
Cloning into '/var/lib/mock/f40-build-2234005-53388/root/chroot_tmpdir/scmroot/vdr'...
$ git fetch origin 5d0165d60c96489b8301a8483a1827a5cae38bbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr
 * [new ref]         5d0165d60c96489b8301a8483a1827a5cae38bbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d0165d Update to 2.6.5