gsutil config will make /etc/boto.cfg ineffective

If there is a system-wide /etc/boto.cfg, and someone runs "gsutil config", it will copy the entire contents of /etc/boto.cfg into ~/.boto (along with the new information added by the config subcommand). Then, if someone changes /etc/boto.cfg, all values will be overridden by the copy in ~/.boto.

Ideally, "gsutil config" would only write the values of things changed into ~/.boto.