From: | Aleksander Alekseev <aleksander(at)timescale(dot)com> |
---|---|
To: | PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
Cc: | Dagfinn Ilmari Mannsåker <ilmari(at)ilmari(dot)org> |
Subject: | Re: Proposal: manipulating pg_control file from Perl |
Date: | 2025-03-14 14:39:11 |
Message-ID: | CAJ7c6TOUjObRGi=3LnpmuFGi_c43pgXCagnmPhGia21myJWpVQ@mail.gmail.com |
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Lists: | pgsql-hackers |
Hi,
> > It is my understanding that Perl is not extremely aware of alignment.
> > For instance if I want to modify the checksum of the file and the
> > offset of the checksum is let's say 200 bytes on one platform, 204 on
> > another and 208 on a third, pack/unpack will not help me.
> >
> > Or did I miss something?
>
> You have to specify alignment manually using the `x![$type]` notation.
> I actually wrote up a pack template for the entire control file
> (assuming all types have alignof==sizeof), and it seems to work. Run
> the attached with a Postgres 17 data directory as the arguemnt, and it
> should show all the fields.
Oh that's neat. Thanks for sharing!
--
Best regards,
Aleksander Alekseev
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