[tz] Add option to act like global-tz

[Paul Eggert]

On 7/27/22 01:47, Stephen Colebourne via tz wrote:

> Can you clarify what is generated?

With the patch, this shell command:

   make PACKRATDATA=backzone PACKRATLIST=zone.tab install

installs into /usr/share/zoneinfo files that are identical to those 
installed by global-tz's "make install", except that 
/usr/share/zoneinfo/tzdata.zi's lines differ in ways that should not 
matter. To be precise, tzdata.zi's lines are sorted differently (which 
is irrelevant) and have one unused ruleset (also irrelevant, and easily 
fixed with the attached further patch which I have not installed either) 
and tzdata.zi's version comments differ as follows:

   -# version 2022agtz-122-gcd2e4b5

   +# version 2022a-60-ge743ce9

   +# ddeps backzone zone.tab


None of this should affect how tzdata.zi is interpreted.


> the tooling chains
> that global-tz supports need the *source* files (africa, europe,
> northamerica...) to contain the data

You can get that by using the tailored_tarballs target added recently. 
For example, this shell command:

   make DATAFORM=rearguard \
     PACKRATDATA=backzone PACKRATLIST=zone.tab tailored_tarballs

generates a tarball that should be suitable for the toolchains you 
mention. I just now did that using the two proposed patches, and put the 
results here temporarily:

https://www.cs.ucla.edu/~eggert/tz/tzdata2022a-61-g3af508c-tailored.tar.gz
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