Re: [PATCH] t9604: Fix test for musl libc and new Debian

[Jeff King <peff@peff.net>]

On Sat, Apr 06, 2024 at 10:29:10AM +0700, Đoàn Trần Công Danh wrote:

> CST6CDT and the like are POSIX timezone, with no rule for transition.
> And POSIX doesn't enforce how to interpret the rule if it's omited.
> Some libc resorted back to IANA (formerly Olson) db rules for those
> timezones.  Other libc (e.g. musl) interpret that as no transition at
> all [1].
> 
> In addition, distributions (notoriously Debian-derived, which uses IANA
> db for CST6CDT and the like) started to split "legacy" timezones
> like CST6CDT, EST5EDT into `tzdata-legacy', which will not be installed
> by default [2].
> 
> In those cases, t9604 will run into failure.
> 
> Let's switch to POSIX timezone with rules to change timezone.

This made me wonder if we are losing EST5, etc. We use that in t0006,
for example. But I guess not, since I do not have tzdata-legacy
installed (I am on Debian unstable) and haven't run into issues (I
didn't notice the cvsimport one because I lack other prereqs to run
those tests).

-Peff