$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-genss.git /var/lib/mock/f41-build-side-1-2951832-35498/root/chroot_tmpdir/scmroot/gap-pkg-genss
Cloning into '/var/lib/mock/f41-build-side-1-2951832-35498/root/chroot_tmpdir/scmroot/gap-pkg-genss'...
$ git fetch origin 728cb3a9fc35ccd66f946dc9dea89a962fe766e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-genss
 * [new ref]         728cb3a9fc35ccd66f946dc9dea89a962fe766e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 728cb3a Version 1.6.9