I just wanted to chime in with my 2c: It is terrible to intentionally break a configuration on upgrade!
When I do a fresh install, then it is common to do work to get the package running (nicely, or at all). I expect some degree of manual intervention.
But on upgrade, when there aren't any significant upstream changes (not sure if that's entirely true for pdns squeeze->wheezy, but this change isn't dependent on upstream anyway) I _do_not_ expect to have to touch the configuration. I am always very grateful for Debian providing such great upgrade compatibility.
That's why I agree with juha that this is a bad change. It will make many people unhappy when they upgrade pdns.
Isn't there a way to conditionally include a conffile? The reference to the debian manual sounded like no though. If that really is the case, I could possibly write a patch for postinst, if there's a change to get it included.
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