$ git clone -n https://src.fedoraproject.org/rpms/duplicity.git /var/lib/mock/f40-build-2209208-52150/root/chroot_tmpdir/scmroot/duplicity
Cloning into '/var/lib/mock/f40-build-2209208-52150/root/chroot_tmpdir/scmroot/duplicity'...
$ git fetch origin b1d233a8b1f2aee47f16b6a917797aeda2d83d85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/duplicity
 * [new ref]         b1d233a8b1f2aee47f16b6a917797aeda2d83d85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1d233a Don't BR python3-future, it's removed since 2.1.2