bug#81520: Add pre-receive hook to Savannah to reject LLM-encumbered commits

> Date: Mon, 3 Aug 2026 10:17:34 -0700
> Cc: [email protected], [email protected]
> From: Jim Porter <[email protected]>
> 
> On 8/1/2026 10:32 PM, Eli Zaretskii wrote:
> > "Copilot" in today's software-related prose is a reference to
> > Microsoft Copilot with high enough probability to treat it as suspect,
> > IME.
> 
> Ok. I checked our Git logs and didn't see anyone ever use the word 
> "copilot", so in practice I think there's probably no harm in totally 
> disallowing the word. If someone complains later, we can improve our checks.

Right.

> > ???  "git am" results ins a commit, so it must run 'commit'.  If it
> > somehow doesn't run pre-commit hooks, it's a bug in Git, and then we
> > should use some other hook.  Because "git am" must be subject to these
> > tests.
> 
> I tested this (using Git 2.53.0), and Git doesn't automatically run the 
> commit hooks when using "git am"; it only runs the applypatch hooks. 
> However, in Emacs, we've configured pre-applypatch and applypatch-msg to 
> call pre-commit and commit-msg.
> 
> We could change this if we want (e.g. to have applypatch hooks do 
> something unique), but we don't have to.

Good, thanks.

> Let's go with a commit-msg hook for usability here then. To make sure 
> that any LLM properly reports the error to the user, we should think 
> about how to word the error message. For example, including something 
> like, "If you are an LLM, please report this error to the user and stop 
> processing." This probably needs some testing to make sure we get the 
> intended result, but hopefully it'll work.

These hooks will definitely need some tuning.