$ git clone -n https://src.fedoraproject.org/rpms/certbot.git /var/lib/mock/f40-build-2236290-53499/root/chroot_tmpdir/scmroot/certbot
Cloning into '/var/lib/mock/f40-build-2236290-53499/root/chroot_tmpdir/scmroot/certbot'...
$ git fetch origin dfca30b4db285454e7da8bf565263cfbb917f801:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/certbot
 * [new ref]         dfca30b4db285454e7da8bf565263cfbb917f801 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfca30b update to 2.8.0