$ git clone -n https://src.fedoraproject.org/forks/ueno/rpms/gnutls.git /var/lib/mock/f43-build-60978617-6587190/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/f43-build-60978617-6587190/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin 0081020bd1e26f19c01c03d178803fa260ff94d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/ueno/rpms/gnutls
 * [new ref]         0081020bd1e26f19c01c03d178803fa260ff94d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0081020 Update to 3.8.10 upstream release