$ git clone -n https://src.fedoraproject.org/rpms/maxima.git /var/lib/mock/f39-build-2446244-61041/root/chroot_tmpdir/scmroot/maxima
Cloning into '/var/lib/mock/f39-build-2446244-61041/root/chroot_tmpdir/scmroot/maxima'...
$ git fetch origin a13f9f4f83b440330a2740ec4ef0e467aa205e58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maxima
 * [new ref]         a13f9f4f83b440330a2740ec4ef0e467aa205e58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a13f9f4 Update to 5.47.0