$ git clone -n https://src.fedoraproject.org/rpms/gnutls.git /var/lib/mock/f41-build-820264-152147/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/f41-build-820264-152147/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin b07c9547bac310479a748b98ce5ae62098cc1193:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnutls
 * [new ref]         b07c9547bac310479a748b98ce5ae62098cc1193 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b07c954 Enable X25519Kyber768Draft00 key exchange in TLS