If something stops working, an administrator may execute the original package configuration routine in order to modify wrong settings. There is no direct procedure invocation, but the package manager acts as a wrapper providing a command to accomplish this task. Currently this feature is only implemented by and even if in Gentoo it is not used as often as in Debian. Although the default package managers of other distributions do not support this operation, they usually provide alternative software to achieve this goal.
We presented this feature here for the sake of completeness, but, as the reader can see, we are still studying a way to make PackageFS able to support this facility. We describe the possible solutions in chapter 6.4.