[Gnu-arch-users] Partial update

[Colin Fox]

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Is it possible with update or replay or something to update to a
specific patch level?

For example, I have a production tree currently at patch 10, and I want
it to update to patch 16. The archive is now at patch 19.

I've tried "tla update a--b--c--patch-10" and it just updated all the
way to 19.

How do you do a partial update?

And also, if we do an update to patch 10 and realize that there is a
problem, how would we roll back the tree to patch 9?

Thanks
~   cf
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