$ git clone -n https://src.fedoraproject.org/rpms/certbot.git /var/lib/mock/f42-build-3436165-45433/root/chroot_tmpdir/scmroot/certbot
Cloning into '/var/lib/mock/f42-build-3436165-45433/root/chroot_tmpdir/scmroot/certbot'...
$ git fetch origin f8372b73485f63f8fa037eb91bb926fcd0094c73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/certbot
 * [new ref]         f8372b73485f63f8fa037eb91bb926fcd0094c73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8372b7 update to 3.3.0 rhbz#2336260