$ git clone -n https://src.fedoraproject.org/rpms/python-django-mailman3.git /var/lib/mock/f39-build-1538734-36399/root/chroot_tmpdir/scmroot/python-django-mailman3
Cloning into '/var/lib/mock/f39-build-1538734-36399/root/chroot_tmpdir/scmroot/python-django-mailman3'...
$ git fetch origin f83256a5f23539d55f1ff5507c8cfd02051d86f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-django-mailman3
 * [new ref]         f83256a5f23539d55f1ff5507c8cfd02051d86f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f83256a Update to 1.3.9