SVN: Replacing trunk with a branch

If you have an SVN branch on which a huge of amount of work has been done, effectively being the mai开发者_如何学运维n place for development, is there any special way to decide this branch should become the trunk? A project I'm involved with has this situation, it's kind of like taking a branch of your operating-system code and then replacing the entire kernel.

Is there a 'right' or 'wrong' way to handle this? It seems forcing a branch to merge when it's very different doesn't achieve much, if all the trunk changes have been merged to your branch.

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Why not just merge everything back to trunk?

Or if you could (in a single transaction, preferably):

1. Delete the existing trunk.
2. Copy (or rename) the branch to trunk.

Using svnmucc you could do:

svnmucc rm http://host/repos/trunk cp HEAD http://host/repos/branches/b http://host/repos/trunk