$ git clone -n https://src.fedoraproject.org/rpms/vdr-iptv.git /var/lib/mock/f41-build-side-1-2778951-32451/root/chroot_tmpdir/scmroot/vdr-iptv
Cloning into '/var/lib/mock/f41-build-side-1-2778951-32451/root/chroot_tmpdir/scmroot/vdr-iptv'...
$ git fetch origin b3fe43471cdf0af43f1d7990c3dbd2d25e0ca564:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-iptv
 * [new ref]         b3fe43471cdf0af43f1d7990c3dbd2d25e0ca564 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3fe434 convert GPLv2+ license to SPDX