[MERGE] Implement hard-link support for branch and checkout

[Robert Collins]

On Thu, 2007-12-20 at 17:06 -0500, Aaron Bentley wrote:


> My recent acceleration work was initially sparked by the notion of doing
> hardlinks because I expected hard links to be much faster.  But I broke
> it into logical steps, and discovered you don't need hard links to reap
> most of the speed benefits.  Don't mean they're a bad idea, though.

I think it's great you broke it up into steps; I often find surprising
results myself when I do that :).

I don't think hardlinking is a good idea, because its *surprising* to
users, if they forget where things were linked to, or there editor
changes behaviour; and while it's true that they can tell, if they
remember to check there are failure modes where they won't notice - and
may be running code from the place what was surprisingly changed.

I'm not going to -1 on this, but I would rather not see it come in.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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