$ git clone -n https://src.fedoraproject.org/rpms/vdr.git /var/lib/mock/f41-build-814739-149152/root/chroot_tmpdir/scmroot/vdr
Cloning into '/var/lib/mock/f41-build-814739-149152/root/chroot_tmpdir/scmroot/vdr'...
$ git fetch origin 6cac79778785ca66563c1badb59d327e999ac288:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr
 * [new ref]         6cac79778785ca66563c1badb59d327e999ac288 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cac797 Update to 2.6.8