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Type: Bug
Resolution: Not a Bug
Priority: Normal
Fix Version/s: None
Affects Version/s: CentOS Stream 8
Component/s: tzdata
Labels:
- tzdata

Regression:
None
Severity:
Moderate

Pool Team:

rhel-sst-pt-libraries

Story Points:
0
Blocked:
False
Blocked Reason:

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Product Documentation Required:
None
Products:

CentOS Stream
Sprint:
None

Preliminary Testing:
None
Test Coverage:
None

Architecture:

All

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None

What were you trying to do that didn't work?

TL;DR
The tzdata package provided in Centos 8 has additional transitions in a variety of zoneinfo files that are invalid.

Europe/London is an example where there is a transition from GMT -> GMT -> BST. This is impossible as you can only transition from GMT -> BST -> GMT.

When I compare the total number of transitions in el8 vs el9 there is 2 extra transitions.

1 for LMT (local mean time) which can be there but is not necessary. (Ok to be there).

1 extra transition for GMT -> GMT which is invalid.

Full list of zones with invalid transitions detected in el8 package:

Africa/Ceuta

America/Barbados

America/Matamoros

America/Monterrey

America/Rainy_River

America/Winnipeg

Antarctica/Macquarie

Arctic/Longyearbyen

Asia/Baku

Asia/Gaza

Asia/Hebron

Asia/Istanbul

Asia/Samarkand

Asia/Tashkent

Asia/Tbilisi

Asia/Yerevan

Atlantic/Jan_Mayen

Australia/ACT

Australia/Adelaide

Australia/Brisbane

Australia/Broken_Hill

Australia/Canberra

Australia/Currie

Australia/Eucla

Australia/Hobart

Australia/Lindeman

Australia/Melbourne

Australia/NSW

Australia/Perth

Australia/Queensland

Australia/South

Australia/Sydney

Australia/Tasmania

Australia/Victoria

Australia/West

Australia/Yancowinna

Canada/Central

Eire

Etc/GMT+1

Etc/GMT-1

Etc/GMT+10

Etc/GMT-10

Etc/GMT+11

Etc/GMT-11

Etc/GMT+12

Etc/GMT-12

Etc/GMT-13

Etc/GMT-14

Etc/GMT+2

Etc/GMT-2

Etc/GMT+3

Etc/GMT-3

Etc/GMT+4

Etc/GMT-4

Etc/GMT+5

Etc/GMT-5

Etc/GMT+6

Etc/GMT-6

Etc/GMT+7

Etc/GMT-7

Etc/GMT+8

Etc/GMT-8

Etc/GMT+9

Etc/GMT-9

Europe/Amsterdam

Europe/Belfast

Europe/Belgrade

Europe/Berlin

Europe/Bratislava

Europe/Brussels

Europe/Bucharest

Europe/Budapest

Europe/Chisinau

Europe/Copenhagen

Europe/Dublin

Europe/Guernsey

Europe/Isle_of_Man

Europe/Istanbul

Europe/Jersey

Europe/Kiev

Europe/Kyiv

Europe/Ljubljana

Europe/London

Europe/Luxembourg

Europe/Madrid

Europe/Minsk

Europe/Oslo

Europe/Podgorica

Europe/Prague

Europe/Riga

Europe/Rome

Europe/San_Marino

Europe/Sarajevo

Europe/Simferopol

Europe/Skopje

Europe/Sofia

Europe/Stockholm

Europe/Tallinn

Europe/Tiraspol

Europe/Uzhgorod

Europe/Vatican

Europe/Vienna

Europe/Vilnius

Europe/Warsaw

Europe/Zagreb

Europe/Zaporozhye

GB

GB-Eire

Pacific/Norfolk

Poland

Turkey

Raw Data of an invalid transition for Europe/London:

Perl script to reproduce this issue:

- Note first explode el8 and el9 rpm into the same directory into usr_el8 and usr_el9 for comparison **

#!/usr/bin/env perl

use strict;

use warnings;

use Data::Dumper;

use Test::Deep;

use Time::Tzfile;

my @zones = ("Europe/London");

open(my $fh,"> el8.out");

open(my $hh,"> el9.out");

foreach my $zone (@zones) {

print $zone . "\n";

# get an unassembled raw parse of the file

my $tzdata_el8 = Time::Tzfile->parse(

{ filename => 'usr_el8/share/zoneinfo/' . $zone });

print $fh Dumper($tzdata_el8);

my $tzdata_el9 = Time::Tzfile->parse({ filename => 'usr_el9/share/zoneinfo/' . $zone });

print $hh Dumper($tzdata_el9);

my @el8_types = ();

foreach my $json (@{$tzdata_el8}) { push @el8_types, $json->\{'type'};

}

my @el9_types = ();

foreach my $json (@{$tzdata_el9}) { push @el9_types, $json->\{'type'};

}

my $el8_count = scalar(@el8_types);

my $el9_count = scalar(@el9_types);

cmp_deeply($el8_count, $el9_count);

cmp_deeply(@el8_types, @el9_types);

}

close $fh;

close $hh;

h3. Please provide the package NVR for which bug is seen:
h3. How reproducible:
h3. Dump the Europe/London zoneinfo file for both el8 and el9 and compare.

Perl script to reproduce this issue. Will produce two output files for el8 and el9.

** Note first explode el8 and el9 rpm into the same directory into usr_el8 and usr_el9 for comparison **

#!/usr/bin/env perl

use strict;

use warnings;

use Data::Dumper;

use Test::Deep;

use Time::Tzfile;

my @zones = ("Europe/London");

open(my $fh,"> el8.out");

open(my $hh,"> el9.out");

foreach my $zone (@zones) {

print $zone . "\n";

# get an unassembled raw parse of the file

my $tzdata_el8 = Time::Tzfile->parse({ filename => 'usr_el8/share/zoneinfo/' . $zone }

);

print $fh Dumper($tzdata_el8);

my $tzdata_el9 = Time::Tzfile->parse(

{ filename => 'usr_el9/share/zoneinfo/' . $zone }

);

print $hh Dumper($tzdata_el9);

my @el8_types = ();

foreach my $json (@{$tzdata_el8})

{ push @el8_types, $json->\{'type'}

;

}

my @el9_types = ();

foreach my $json (@{$tzdata_el9})

{ push @el9_types, $json->\{'type'}

;

}

my $el8_count = scalar(@el8_types);

my $el9_count = scalar(@el9_types);

cmp_deeply($el8_count, $el9_count);

cmp_deeply(@el8_types, @el9_types);

}

close $fh;

close $hh;

Steps to reproduce

Download el8 and el9 rpm package and explode contents in usr_el8 and usr_el9
Install required libraries:

cpan install Time::Tzfile
cpan install Test::Deep

Run the above perl script
Compare the el8.out and el9.out output files

See duplicates only found in el8 for Europe/London:

{ 'type' => 'BST', 'offset' => 3600, 'epoch' => 796179600, 'is_dst' => 1 }

,

{ 'type' => 'GMT', 'is_dst' => 0, 'offset' => 0, 'epoch' => 814323600 }

,

{ 'offset' => 0, 'epoch' => 820454400, 'is_dst' => 0, 'type' => 'GMT' }

,

{ 'type' => 'BST', 'is_dst' => 1, 'epoch' => 828234000, 'offset' => 3600 }

,

Note the invalid transition GMT -> GMT which does not appear in the el9 file.

Repeat this process for the full list of zoneinfo files that have the same problem: