$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-repsn.git /var/lib/mock/f38-build-side-42-init-devel-711123-27245/root/chroot_tmpdir/scmroot/gap-pkg-repsn
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-711123-27245/root/chroot_tmpdir/scmroot/gap-pkg-repsn'...
$ git fetch origin 85481e2e0e542d6c2b21b78cb86c711b0be69263:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-repsn
 * [new ref]         85481e2e0e542d6c2b21b78cb86c711b0be69263 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85481e2 Version 3.1.1