$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-smallgrp.git /var/lib/mock/f38-build-side-42-init-devel-730032-27445/root/chroot_tmpdir/scmroot/gap-pkg-smallgrp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-730032-27445/root/chroot_tmpdir/scmroot/gap-pkg-smallgrp'...
$ git fetch origin 5a8ffc385fcbea56649ba2bb18307cbb930723d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-smallgrp
 * [new ref]         5a8ffc385fcbea56649ba2bb18307cbb930723d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a8ffc3 Version 1.5.2.