[ANN] bzr.webdav: a writable hhtp transport

[Aaron Bentley]

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John Arbash Meinel wrote:
> Probably we could do some alternative optimizations for transports that
> don't support append. For example, we would have already downloaded all
> of the knit index, so we know how to update it, rather than downloading
> the whole thing again.
> 
> But the expensive one is the knit data file, and that we haven't
> downloaded yet.

If we have a local copy of all the data in the remote file knit, and we
have a write lock, we can regenerate the knit from the index, without
retrieving it, and then upload it.

Aaron
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