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From: "karlp at tweak dot net.au" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug time/29774] New: tzselect: doesn't handle new backlinks, places
 some countries in the wrong regions
Date: Thu, 10 Nov 2022 16:35:33 +0000
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X-Bugzilla-Component: time
X-Bugzilla-Version: 2.36
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29774

            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, like=
ly
via
https://github.com/eggert/tz/commit/e5f99199ff4efe0808a5076c2484d5b86193124d

glibc's tzselect hasn't been touched since it was synced with upstream to 2=
018g
( see
https://sourceware.org/git/?p=3Dglibc.git;a=3Dhistory;f=3Dtimezone/tzselect=
.ksh)

I propose that glibc update tzselect again from upstream.  (This will likely
also fix https://sourceware.org/bugzilla/show_bug.cgi?id=3D28227)

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) Eur=
ope
2) Americas                                                          8) Ind=
ian
Ocean
3) Antarctica                                                        9) Pac=
ific
Ocean
4) Asia                                                             10) coo=
rd -
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=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20
              7) Spain
2) Cape Verde                                  5) Portugal
3) Falkland Islands                            6) South Georgia & the South
Sandwich Islands
#?=20

```

Example using upstream tzselect
```
karlp@strem:~/src/junk/tz.git ((2022e))$ ./tzselect=20
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) Eur=
ope
3) Antarctica                                                        9) Ind=
ian
Ocean
4) Arctic Ocean                                                     10) Pac=
ific
Ocean
5) Asia                                                             11) coo=
rd -
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=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20
              7) South Georgia & the South Sandwich Islands
2) Cape Verde                                  5) Iceland=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
              8) Spain
3) Falkland Islands                            6) Portugal=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
              9) St Helena
#?=20
```

--=20
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