$ git clone -n https://src.fedoraproject.org/rpms/byaccj.git /var/lib/mock/f40-build-750561-115125/root/chroot_tmpdir/scmroot/byaccj
Cloning into '/var/lib/mock/f40-build-750561-115125/root/chroot_tmpdir/scmroot/byaccj'...
$ git fetch origin b14e04832182672fd0960db6e5ff335b619c8eee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byaccj
 * [new ref]         b14e04832182672fd0960db6e5ff335b619c8eee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b14e048 Convert License tag to SPDX format