$ git clone -n https://src.fedoraproject.org/rpms/kbilliards.git /var/lib/mock/f40-build-2103996-50567/root/chroot_tmpdir/scmroot/kbilliards
Cloning into '/var/lib/mock/f40-build-2103996-50567/root/chroot_tmpdir/scmroot/kbilliards'...
$ git fetch origin 844e265821354a44f2b6b4af970cd0d221a71a96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kbilliards
 * [new ref]         844e265821354a44f2b6b4af970cd0d221a71a96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 844e265 Fix FTBFS (rhbz#2225944)