>> When doing an upgrade on a node, postinstall(8) is already a problem
>> because one does not have the sources in all the cases.  So running
>> a diff against a reference tree is not always an option.
> That's a valid point.

Diffing against a reference tree is not always an option for *us*.  For
an admin who wants to do it, it *is* an option, because such an admin
can save a snapshot as a reference, just after installation if
necessary.

Unless I've misunderstood something, which is certainly possible....

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