[Bug 1945527] Re: Update tzdata to version 2021a-2

[Brian Murray]

bdmurray at clean-focal-amd64:~$ apt-cache policy tzdata
tzdata:
  Installed: 2021a-0ubuntu0.20.04
  Candidate: 2021a-2ubuntu0.20.04
  Version table:
     2021a-2ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-proposed/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-proposed/main i386 Packages
 *** 2021a-0ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-updates/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-updates/main i386 Packages
        500 http://192.168.10.7/ubuntu focal-security/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-security/main i386 Packages
        100 /var/lib/dpkg/status
     2019c-3ubuntu1 500
        500 http://192.168.10.7/ubuntu focal/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal/main i386 Packages
bdmurray at clean-focal-amd64:~$ zdump -v Pacific/Apia | grep 2021
Pacific/Apia  Sat Apr  3 13:59:59 2021 UT = Sun Apr  4 03:59:59 2021 +14 isdst=1 gmtoff=50400
Pacific/Apia  Sat Apr  3 14:00:00 2021 UT = Sun Apr  4 03:00:00 2021 +13 isdst=0 gmtoff=46800
Pacific/Apia  Sat Sep 25 13:59:59 2021 UT = Sun Sep 26 02:59:59 2021 +13 isdst=0 gmtoff=46800
Pacific/Apia  Sat Sep 25 14:00:00 2021 UT = Sun Sep 26 04:00:00 2021 +14 isdst=1 gmtoff=50400
bdmurray at clean-focal-amd64:~$ python3 -c "from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.createTimeZone('Pacific/Apia')); print(str(tz.utcoffset(datetime(2021, 9, 27))))"
14:00:00
bdmurray at clean-focal-amd64:~$ apt-cache policy tzdata
tzdata:
  Installed: 2021a-2ubuntu0.20.04
  Candidate: 2021a-2ubuntu0.20.04
  Version table:
 *** 2021a-2ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-proposed/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-proposed/main i386 Packages
        100 /var/lib/dpkg/status
     2021a-0ubuntu0.20.04 500
        500 http://192.168.10.7/ubuntu focal-updates/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-updates/main i386 Packages
        500 http://192.168.10.7/ubuntu focal-security/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal-security/main i386 Packages
     2019c-3ubuntu1 500
        500 http://192.168.10.7/ubuntu focal/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal/main i386 Packages
bdmurray at clean-focal-amd64:~$ zdump -v Pacific/Apia | grep 2021
Pacific/Apia  Sat Apr  3 13:59:59 2021 UT = Sun Apr  4 03:59:59 2021 +14 isdst=1 gmtoff=50400
Pacific/Apia  Sat Apr  3 14:00:00 2021 UT = Sun Apr  4 03:00:00 2021 +13 isdst=0 gmtoff=46800
bdmurray at clean-focal-amd64:~$ python3 -c "from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.createTimeZone('Pacific/Apia')); print(str(tz.utcoffset(datetime(2021, 9, 27))))"
13:00:00
And the regression check:
bdmurray at clean-focal-amd64:~$ diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v SystemV/MST7 | cut -d' ' -f2-)

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https://bugs.launchpad.net/bugs/1945527

Title:
  Update tzdata to version 2021a-2

Status in tzdata package in Ubuntu:
  Fix Released
Status in tzdata source package in Xenial:
  New
Status in tzdata source package in Bionic:
  Fix Committed
Status in tzdata source package in Focal:
  Fix Committed
Status in tzdata source package in Hirsute:
  Fix Committed

Bug description:
  New upstream version affecting the following timestamp:

  $region/$timezone = Pacific/Apia

  Verification is done with 'zdump'. The first timezone that gets
  changed in the updated package is dumped with 'zdump -v
  $region/$timezone_that_changed' (this needs to be greped for in
  /usr/share/zoneinfo/). [For example: 'zdump -v Pacific/Apia'.] This is
  compared to the same output after the updated package got installed.
  If those are different the verification is considered done.

  [Test Case for all releases]
  1) zdump -v Pacific/Apia | grep 2021

  For releases with ICU timezone data verification is done using the following with dates before and after the change:
  [Test Case for releases >= 20.04 LTS]
  1) sudo apt-get install python3-icu
  2) python3 -c 'from datetime import datetime; from icu import ICUtzinfo, TimeZone; tz = ICUtzinfo(TimeZone.createTimeZone('Pacific/Apia')); print(str(tz.utcoffset(datetime(2021, 9, 27))))'

  Additionally, an upstream update of tzdata removed the 'old' SystemV
  timezones, so we should ensure that they are kept in Ubuntu 20.04 LTS
  and earlier releases. Subsequently, these should be checked for using
  the following:

  [Test Case for releases <= 20.04 LTS]
  diff <(zdump -v America/Phoenix | cut -d' ' -f2-) <(zdump -v SystemV/MST7 | cut -d' ' -f2-)

  Nothing should be returned by the above command.

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