$ git clone -n https://src.fedoraproject.org/rpms/python-jsonpickle.git /var/lib/mock/f39-build-1928952-43073/root/chroot_tmpdir/scmroot/python-jsonpickle
Cloning into '/var/lib/mock/f39-build-1928952-43073/root/chroot_tmpdir/scmroot/python-jsonpickle'...
$ git fetch origin c4fddc863873b6745bae288b6c3acb69671e24e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jsonpickle
 * [new ref]         c4fddc863873b6745bae288b6c3acb69671e24e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4fddc8 3.0.2