$ git clone -n https://src.fedoraproject.org/rpms/bear.git /var/lib/mock/f45-build-39699-750/root/chroot_tmpdir/scmroot/bear
Cloning into '/var/lib/mock/f45-build-39699-750/root/chroot_tmpdir/scmroot/bear'...
$ git fetch origin d3e1fc45b0e56e9f9115c084d0bdeb79dfefd73a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bear
 * [new ref]         d3e1fc45b0e56e9f9115c084d0bdeb79dfefd73a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d3e1fc4 Update to 4.2.2 (#2517204)