$ git clone -n https://src.fedoraproject.org/rpms/maxima.git /var/lib/mock/f39-build-1977811-43334/root/chroot_tmpdir/scmroot/maxima
Cloning into '/var/lib/mock/f39-build-1977811-43334/root/chroot_tmpdir/scmroot/maxima'...
$ git fetch origin e7499b14a4cd62510f00a0ba4730d1395a8595e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maxima
 * [new ref]         e7499b14a4cd62510f00a0ba4730d1395a8595e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7499b1 Rebuild for ecl 23.9.9