$ git clone -n https://src.fedoraproject.org/rpms/certbot.git /var/lib/mock/f40-build-2667996-67179/root/chroot_tmpdir/scmroot/certbot
Cloning into '/var/lib/mock/f40-build-2667996-67179/root/chroot_tmpdir/scmroot/certbot'...
$ git fetch origin 0fa59f2d92088ef6c76e8b6e3328feae7ade9b30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/certbot
 * [new ref]         0fa59f2d92088ef6c76e8b6e3328feae7ade9b30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fa59f2 update to 2.9.0