$ git clone -n https://src.fedoraproject.org/rpms/ipset.git /var/lib/mock/f40-build-2237009-53529/root/chroot_tmpdir/scmroot/ipset
Cloning into '/var/lib/mock/f40-build-2237009-53529/root/chroot_tmpdir/scmroot/ipset'...
$ git fetch origin 1d4434c8b293e6d4c9d0d68afe0b6cb279a0be37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ipset
 * [new ref]         1d4434c8b293e6d4c9d0d68afe0b6cb279a0be37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d4434c Update to 7.19