From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: More tzdb fun: POSIXRULES is being deprecated upstream
Date: Fri, 19 Jun 2020 16:22:04 -0400
Message-ID: <1755873.1592598124@sss.pgh.pa.us> (raw)
In-Reply-To: <CA+TgmoZcu2Z1uDm5OKW=P9pc=oQ7534GhuiM1_EbmRq54sQJ8w@mail.gmail.com>
References: <1390.1562258309@sss.pgh.pa.us>
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<1753692.1592594861@sss.pgh.pa.us>
<CA+TgmoZRwXwZjOUOZhRF16GRzWQddBe4j1=7hy0ytmxY6_9K5w@mail.gmail.com>
<1754851.1592596507@sss.pgh.pa.us>
<CA+TgmoZcu2Z1uDm5OKW=P9pc=oQ7534GhuiM1_EbmRq54sQJ8w@mail.gmail.com>
Robert Haas <robertmhaas@gmail.com> writes:
> On Fri, Jun 19, 2020 at 3:55 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> What I'm concerned about is that people depending on the existing
>> behavior are likely to wake up one fine morning and discover that it's
>> broken after a routine tzdata update. I think that it'd be a better
>> user experience for them to see a release-note entry in a PG update
>> release explaining that this will break and here's what to do to fix it.
> I was assuming that if you did an update of the tzdata, you'd notice
> if posixrules had been nuked. I guess that wouldn't help people who
> are using the system tzdata, though.
Yeah, exactly. We can control this easily enough for PG-supplied tzdata
trees, but I think a significant majority of actual users are using
--with-system-tzdata builds, because we've been telling packagers to
do it that way for years. (Nor does changing that advice seem like
a smart move.)
> It might be nice to know what
> Debian, RHEL, etc. plan to do about this, but I'm not sure how
> practical it is to find out.
There's probably no way to know until it happens :-(. We can hope
that they'll be conservative, but it's hard to be sure. It doesn't
help that the bigger players rely on glibc: if I understand what
Eggert was saying, nuking posixrules would bring tzcode's behavior
into closer sync with what glibc does, so they might well feel it's
a desirable change.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, robertmhaas@gmail.com, peter.eisentraut@2ndquadrant.com, pgsql-hackers@lists.postgresql.org
Subject: Re: More tzdb fun: POSIXRULES is being deprecated upstream
In-Reply-To: <1755873.1592598124@sss.pgh.pa.us>
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