Re: UCT (Re: pgsql: Update time zone data files to tzdata release 2019a.)

Re: Tom Lane 2019-06-11 <24452(dot)1560285699(at)sss(dot)pgh(dot)pa(dot)us>
> The only way I can get it to pick "Etc/UCT" is if that's what I put
> into /etc/localtime. (In which case I maintain that that's not a bug,
> or at least not our bug.)

Did you try a symlink or a plain file for /etc/localtime?

> So I'm still mystified by Christoph's report, and am forced to suspect
> pilot error -- specifically, /etc/localtime not containing what he said.

On Debian unstable, deleting /etc/timezone, $TZ not set, and with this symlink:
lrwxrwxrwx 1 root root 27 Mär 28 14:49 /etc/localtime -> /usr/share/zoneinfo/Etc/UTC

/usr/lib/postgresql/11/bin/initdb -D pgdata
$ grep timezone pgdata/postgresql.conf
log_timezone = 'UCT'
timezone = 'UCT'

/usr/lib/postgresql/12/bin/initdb -D pgdata
$ grep timezone pgdata/postgresql.conf
log_timezone = 'Etc/UTC'
timezone = 'Etc/UTC'

Same behavior on Debian Stretch (stable):
lrwxrwxrwx 1 root root 27 Mai 7 11:14 /etc/localtime -> /usr/share/zoneinfo/Etc/UTC

$ grep timezone pgdata/postgresql.conf
log_timezone = 'UCT'
timezone = 'UCT'

$ grep timezone pgdata/postgresql.conf
log_timezone = 'Etc/UTC'
timezone = 'Etc/UTC'

> Anyway, moving on to the question of what should we do about this,
> I don't really have anything better to offer than back-patching 23bd3cec6.

The PG12 behavior seems sane, so +1.

Christoph