[PATCH 1 of 8] update: add pre-applyupdate hook

[Matt Mackall]

On Mon, 2013-05-06 at 12:36 -0700, Durham Goode wrote:
> # HG changeset patch
> # User Durham Goode <durham at fb.com>
> # Date 1367429725 25200
> #      Wed May 01 10:35:25 2013 -0700
> # Node ID 4ddd3b2b3407fe3344fd800ea11ab377a34b8ae6
> # Parent  bfd128c3fbb830b332fec89eddc82b0b9aa31b64
> update: add pre-applyupdate hook
> 
> This adds a hook after update actions are calculated but before they are
> applied. This allows an extension to download any data necessary for the
> update if necessary.

Given that 'hooks' are a public interface (on par with the command line)
and 'actions' are rather ad-hoc guts of the merge code, I think this is
probably not the right way to expose this.

-- 
Mathematics is the supreme nostalgia of our time.