[tz] Version identification (was Re: Downstream use of 2021c)

[Russ Allbery]

Tom Lane via tz <tz at iana.org> writes:

> My point isn't whether it's possible to figure this out on any
> given platform, but that tzdata itself ought to define a standard
> way to find it out.  And I do not agree with Paul's opinion that
> "include tzdata.zi" is a good enough answer; lots of platforms
> won't care to expend the disk space to do it that way.

tzdata.zi is 112KB out of 7.2MB total size (1.7MB apparent size which
doesn't count file system overhead) in /usr/share/zoneinfo on my Debian
system.  Yes, it's larger than a simple version file, but it doesn't seem
that significant on anything other than small embedded systems where I'm
not sure the entire tzdata database would be desired anyway.

-- 
Russ Allbery (eagle at eyrie.org)             <https://www.eyrie.org/~eagle/>