Spec: Indicate when an upgrade will be save-breaking.

[pjf]

Some mods are save-breaking, and can't be upgraded automatically (RSS 8 is an example). Since ckan update; ckan upgrade is likely to be common, we don't want to surprise users by breaking their saves.

We need a way to indicate in the CKAN file when a mod is not safe to upgrade.

[NathanKell]

I think you mean RF v8 :)

[pjf]

I think you mean RF v8 :)

This is a beautiful example of why I need the CKAN; I would have totally gone and broken all my saves, and still not upgraded RSS, because RF hashed to RSS in my dodgy human memory. ;)

[pjf]

My thoughts regarding this are:

• Modules can't predict which releases in the future will break them.
• Modules can predict which releases form the past they will break.

Therefore something with the semantics of breaks < 8.0 indicates that an upgrade is not safe if a version of the mod less than 8.0 is already installed, whereas upgrading from 8.0 to 8.3 would be just fine.

[NathanKell]

That makes sense to me; by definition save-breaking is going to be a backwards-looking attribute.

[AlexanderDzhoganov]

In addition to that, I think we should do our best to discourage save-breaking mods by displaying a big nasty can't-ignore-this warning message to the user on upgrade.

[pjf]

In addition to that, I think we should do our best to discourage save-breaking mods by displaying a big nasty can't-ignore-this warning message to the user on upgrade.

Yes. Yes so much.