$ git clone -n https://src.fedoraproject.org/rpms/vdr-tvguide.git /var/lib/mock/f41-build-side-1-2778960-32451/root/chroot_tmpdir/scmroot/vdr-tvguide
Cloning into '/var/lib/mock/f41-build-side-1-2778960-32451/root/chroot_tmpdir/scmroot/vdr-tvguide'...
$ git fetch origin d10c415348da4b722334b1d203626ac24d918bef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-tvguide
 * [new ref]         d10c415348da4b722334b1d203626ac24d918bef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d10c415 convert GPLv2+ license to SPDX