[MERGE] --no-backup option for bzr upgrade (#118653)

[Lukáš Lalinský]

On St, 2007-07-11 at 01:01 +1000, Robert Collins wrote:
> However --no-backup is really very dangerous; more dangerous than you
> might predict.
> 
> Specifically any sort of link error will leave branches/repositories in
> an unrecoverable state if no backup has been taken.

For this particular case, I don't think this is a big problem, because
you can simple re-upload the code to launchpad. But I understand that in
general is --no-backup a bad idea.

> Further to that some
> upgrades will use the backup as the source for the upgraded data so we
> may not be able to avoid it per se without changing where we make the
> backup too... 

Hmm, it looks like some upgrade tests are missing because no backup
doesn't break any of them. :)

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