$ git clone -n https://src.fedoraproject.org/rpms/gnutls.git /var/lib/mock/f42-build-3427582-45332/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/f42-build-3427582-45332/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin 7458001e1ae8bf6678b113a6d70639dbdc1513e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnutls
 * [new ref]         7458001e1ae8bf6678b113a6d70639dbdc1513e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7458001 Switch from liboqs to leancrypto