csup update actions

[CyberLeo Kitsana]

Hi!

Does anyone know how csup handles updating changed files?

Given that each branch of FreeBSD is nearly 500 megabytes in size, and
undoubtedly contains a significant number of identical files from branch
to branch, I figure it's feasable to create a new branch consisting
entirely of files hardlinked from a lower branch, then run csup over that.

Would csup properly handle this scenario and unlink/recreate the changed
files, or would it update them in-place, and thus destroy the parent branch?

Thanks!

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