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[bug#63006] Time zone database improvements

From: Ludovic Courtès
Subject: [bug#63006] Time zone database improvements
Date: Sun, 30 Apr 2023 23:00:55 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux)


Leo Famulari <> skribis:

> Currently, almost the entire distro is rebuilt when we need to update
> the time zone database, tzdata.
> We need to do this a few times a year, and it doesn't make any sense for
> packages to keep a static reference to this database which will be out
> of date in a few months.
> Instead, they should look up the time zones at run-time, which most
> programs that actually use time zones do.

Most programs behave fine though, right?  In particular, glibc honors
$TZDIR and we set TZDIR to the latest tzdata in (gnu system).

> These patches start improving the situation.
> Libical has committed a fix for this almost 5 years ago, but still
> hasn't released it, so we cherry-pick Nix's patch:


> Go wants to embed a copy of the database in case one cannot be found.  I
> don't see why having an incorrect time zone is better than no time
> zones, so here's a patch to remove the embedded copy.

Sounds good, but do we need to build it in a branch first?

> We have more work to do to remove or replace python-pytz, which
> unfortunately contains its own embedded copy of the database and a few
> thousand dependents. Luckily, it seems that Python 3.9 has made pytz
> obsolete:




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