$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-float.git /var/lib/mock/f40-build-2590681-62633/root/chroot_tmpdir/scmroot/gap-pkg-float
Cloning into '/var/lib/mock/f40-build-2590681-62633/root/chroot_tmpdir/scmroot/gap-pkg-float'...
$ git fetch origin 7c96da509b6ffa3c43d606e0de16381168cba880:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-float
 * [new ref]         7c96da509b6ffa3c43d606e0de16381168cba880 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c96da5 Rebuild for gap 4.13.0