[Bug 1948698] Re: Update tzdata to version 2021e

[Steve Beattie]

Okay from the Ubuntu Security team for these tzdata updates to land in
security pockets. Thanks!

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Title:
  Update tzdata to version 2021e

Status in tzdata package in Ubuntu:
  In Progress
Status in tzdata source package in Bionic:
  In Progress
Status in tzdata source package in Focal:
  In Progress
Status in tzdata source package in Hirsute:
  In Progress
Status in tzdata source package in Impish:
  In Progress

Bug description:
  New upstream version affecting the following timestamp:

  $region/$timezone = Asia/Gaza

  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 Asia/Gaza'.] 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 Asia/Gaza 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.creat eTimeZone('Pacific/Apia')); print(str(tz.utcoffset(datetime(2021, 9, 26))))'

  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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