omniti-labs/omnios-build — pull request #17 by lotheac (2013-05-30 16:07:09+00:00)
Title: Don't overwrite configuration files when upgrading packages

I think it would make sense to add this global transform to prevent IPS from overwriting config files (I'm assuming those are in etc/) on package upgrades. pkg(5) man page has more details on the file action's preserve attribute.