$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-congruence.git /var/lib/mock/f38-build-side-42-init-devel-566872-25898/root/chroot_tmpdir/scmroot/gap-pkg-congruence
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-566872-25898/root/chroot_tmpdir/scmroot/gap-pkg-congruence'...
$ git fetch origin ef04011722c0aca22da63541e1e2be36d5d16db8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-congruence
 * [new ref]         ef04011722c0aca22da63541e1e2be36d5d16db8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef04011 Version 1.2.5.