Mutating history in Subversion and Bazaar

[David Allouche]

Jelmer Vernooij wrote:
> Yes, though only if that hook script allows editing the svn:date
> revprop. I'm not sure whether that should be considered a problem
> though. If somebody would edit a Bazaar revision without changing the
> revision id, that can corrupt the distributed database as well.

The important question, which I do not think has been answered yet, is:
"What kind of history destroying changes people usually do on SVN
repositories?" Only after answering that question can we have a useful
discussion on how to catch them.

Bzr needs to cope better with referential integrity violations anyway,
if only because that's a common problem to all reproducible import
systems. So we can accept only preserving integrity for common history
alterations. However dealing with integrity violations is always going
be troublesome to users, and we should prevent them as much as
reasonably possible.

So, what kind of history-destroying changes of SVN repos are likely
represent 99% of the instances found in the wild? And what is their
respective importance?

-- 
                                                            -- ddaa

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