would give warning output like the following:
/usr/local/lib/repomirror/repomirror/fetcher/rsync.py:78: UserWarning: Rsync process returned non-zero 0 (Success) for rsync --recursive --times --links --hard-links --delete-after --delay-updates --copy-links --safe-links --delete-excluded --no-motd --exclude=.* --verbose --log-file-format="[RSYNC arch.mirror.constant.com:873]:%l:%f%L" --log-file=/var/log/repo/arch.log rsync://arch.mirror.constant.com:873/archlinux/. /srv/repos/arch/.