On Oct 30, 2025, at 09:55, Tom Lane <[email protected]> wrote:

> Trouble is, you then need an arbitrary client-made choice about which
> commit to run the ABI check against.

It’s currently coded to use the most recent tag or, if there is none in the 
branch, the branch root.

> If that code does something we
> realize we don't want, we're back up against the problem of moving the
> buildfarm configuration to fix it.  I'd rather the decision be opt-in.

Fair. Just means that if no one adds a history file to a branch that branch 
will never be tested and there’s no automated way to realize it.

> (Also, the only rules I heard proposed for such client-driven choices
> involved git tags.  I already explained why I don't want that: git
> tags are hard to modify and subject to too many other constraints.)

Yeah, it just went with the most recent tag to keep it simple, no other 
metadata.

D

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