$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-primgrp.git /var/lib/mock/f38-build-side-42-init-devel-711116-27245/root/chroot_tmpdir/scmroot/gap-pkg-primgrp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-711116-27245/root/chroot_tmpdir/scmroot/gap-pkg-primgrp'...
$ git fetch origin f171352a7e9d66eb31e4dcf54262e70e04913090:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-primgrp
 * [new ref]         f171352a7e9d66eb31e4dcf54262e70e04913090 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f171352 Version 3.4.4.