[Bug time/29774] New: tzselect: doesn't handle new backlinks, places some countries in the wrong regions

[Bug time/29774] New: tzselect: doesn't handle new backlinks, places some countries in the wrong regions

[karlp at tweak dot net.au]

https://sourceware.org/bugzilla/show_bug.cgi?id=29774

            Bug ID: 29774
           Summary: tzselect: doesn't handle new backlinks, places some
                    countries in the wrong regions
           Product: glibc
           Version: 2.36
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: karlp at tweak dot net.au
  Target Milestone: ---

With the changes in tz for backzones and backlinks, at least starting from
here:
https://github.com/eggert/tz/commit/0b925f6d8aaf927ac20049ae0ff3b527684b60c7
with tzdb-2022c, the version of tzselect in glibc no longer places countries
like Iceland in "Atlantic" but in "Africa"

This is fixed and works correctly using tzselect from the tzdb itself, likely
via
https://github.com/eggert/tz/commit/e5f99199ff4efe0808a5076c2484d5b86193124d

glibc's tzselect hasn't been touched since it was synced with upstream to 2018g
( see
https://sourceware.org/git/?p=glibc.git;a=history;f=timezone/tzselect.ksh)

I propose that glibc update tzselect again from upstream.  (This will likely
also fix https://sourceware.org/bugzilla/show_bug.cgi?id=28227)

Example using system tzselect (glibc) (no iceland)
```
karlp@strem:~/src/junk/tz.git ((2022e))$ /usr/bin/tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent, ocean, "coord", or "TZ".
1) Africa                                                            7) Europe
2) Americas                                                          8) Indian
Ocean
3) Antarctica                                                        9) Pacific
Ocean
4) Asia                                                             10) coord -
I want to use geographical coordinates.
5) Atlantic Ocean                                                   11) TZ - I
want to specify the timezone using the Posix TZ format.
6) Australia
#? 5
Please select a country whose clocks agree with yours.
1) Bermuda                                     4) Faroe Islands                
              7) Spain
2) Cape Verde                                  5) Portugal
3) Falkland Islands                            6) South Georgia & the South
Sandwich Islands
#? 

```

Example using upstream tzselect
```
karlp@strem:~/src/junk/tz.git ((2022e))$ ./tzselect 
Please identify a location so that time zone rules can be set correctly.
Please select a continent, ocean, "coord", or "TZ".
1) Africa                                                            7)
Australia
2) Americas                                                          8) Europe
3) Antarctica                                                        9) Indian
Ocean
4) Arctic Ocean                                                     10) Pacific
Ocean
5) Asia                                                             11) coord -
I want to use geographical coordinates.
6) Atlantic Ocean                                                   12) TZ - I
want to specify the timezone using the Posix TZ format.
#? 6
Please select a country whose clocks agree with yours.
1) Bermuda                                     4) Faroe Islands                
              7) South Georgia & the South Sandwich Islands
2) Cape Verde                                  5) Iceland                      
              8) Spain
3) Falkland Islands                            6) Portugal                     
              9) St Helena
#? 
```

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