$ git clone -n https://src.fedoraproject.org/rpms/netsniff-ng.git /var/lib/mock/f40-build-2238582-53579/root/chroot_tmpdir/scmroot/netsniff-ng
Cloning into '/var/lib/mock/f40-build-2238582-53579/root/chroot_tmpdir/scmroot/netsniff-ng'...
$ git fetch origin 3426a67c44ff1c92ef411b0bc3cdd2df1f9d26bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/netsniff-ng
 * [new ref]         3426a67c44ff1c92ef411b0bc3cdd2df1f9d26bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3426a67 rebuild for new libsodium