[RFC] Pre-commit hooks and other requests

[Robert Collins]

On Tue, 2007-06-26 at 23:41 +1000, Ian Clatworthy wrote:
> Before I go overboard restructuring commit, I'd like to have a feel for
>  any future features that are *likely* to be requested. For example,
> right now commit supports hooks for code to execute after a commit is
> successful. Is there a need for pre-commit hooks or some "mid-commit" hooks?

There certainly are desires for that; but I think that as long as we
meet our performance goals folk can always tweak later to add such
hooks.

pre-commit hooks are complex because what is being committed may not
match whats on disk in terms of shape; and some hooks may want to mutate
the tree (e.g. for $id$ usage).

-Rob
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