$ git clone -n https://src.fedoraproject.org/rpms/python-pybv.git /var/lib/mock/f39-build-1690119-41135/root/chroot_tmpdir/scmroot/python-pybv
Cloning into '/var/lib/mock/f39-build-1690119-41135/root/chroot_tmpdir/scmroot/python-pybv'...
$ git fetch origin b96ed5f02f576b696539a2251c097e8512e623a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pybv
 * [new ref]         b96ed5f02f576b696539a2251c097e8512e623a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b96ed5f Update to 0.7.5