How to update tree using bzrlib

[Nicholas Allen]

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Hi,

I would like to add a feature to bzr-email-notifier so that it can
update the tree for a branch if it has one. This way even when pushing
to a dumb server the tree could be automatically updated. Also it would
be nice to be able to store the email configuration in a bzr branch
which you can then push to in order to change the email settings.

I saw there is an update method on the Branch class. Is this the right
method to call or is this only for bound branches. Will this fail if the
branch doesn't have a tree?

Nick
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