Re: Catalog version access

On Tue, Jan 25, 2022 at 01:12:32PM +0900, Michael Paquier wrote:
> Once you remove the requirement of a running server, we have basically
> what has been recently implemented with postgres -C for
> runtime-computed GUCs, because we already go through a read of the
> control file to be able to print those GUCs with their correct
> values.  This also means that it is already possible to check if a
> data folder is compatible with a set of binaries with this facility,
> as any postgres -C command with a runtime GUC would trigger this
> check.  Using any of the existing runtime GUCs may be confusing, but
> that would work.  And I am not really convinced that we have any need
> to add a specific GUC for this purpose, be it a sort of
> is_controlfile_valid or controlfile_checksum (CRC32 of the control
> file).

Thinking more about this one, we can already do that, so I have
marked the patch as RwF.  Perhaps we could just add a GUC, but that
feels a bit dummy.
--
Michael