rfc: optionally hardlink packs for local branching

[Aaron Bentley]

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John Arbash Meinel wrote:
> I would say because "bzr branch --hardlink" is discoverable from "bzr help
> branch" while knowing that you should be using a local repository is a bit
> harder to discover. (It at least requires reading another document,
> which has to
> explain how to set one up, etc.)

As soon as you start using a hard-linked repository, its efficiency gets
worse and worse.  We should not be enticing people down the wrong path.
 If we make hard-linked repos more discoverable than shared repos, we
are doing it wrong.

Also, my hardlinked-working-tree change has already been approved, and
it uses --hardlink to mean something else.

The only reason I haven't merged it yet was because Ian requested
testing on a filesystem that doesn't support hard links.  I only have
ext3 and ntfs, and both of them support hard links.  I expect I'll have
to create a VFAT filesystem on a loopback device.

Aaron
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