[Bug 1858857] Re: gnome-calendar: Hits assert when timezone set to Etc/UTC

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https://bugs.launchpad.net/bugs/1858857

Title:
  gnome-calendar: Hits assert when timezone set to Etc/UTC

Status in gnome-calendar package in Ubuntu:
  Fix Committed
Status in gnome-calendar source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  When the system timezone is set to Etc/UTC, most notably in the 20.04
  Live CD environment, gnome-calendar fails to start, as it hits an
  assert.

  ERROR:../src/utils/gcal-date-time-utils.c:249:gcal_timezone_to_icaltimezone: assertion failed: (ical_tz != NULL)
  Bail out! ERROR:../src/utils/gcal-date-time-utils.c:249:gcal_timezone_to_icaltimezone: assertion failed: (ical_tz != NULL)
  Aborted (core dumped)

  This is reproducible in focal with: gnome-calendar 3.34.2-1build1
  This is NOT reproducible in eoan with: gnome-calendar 3.34.2-1

  More seriously, this bug is triggered when a user presses the Super
  key in the Live CD test environment and searches for an application,
  as dbus will attempt to start the gnome-calendar service, and gnome-
  calendar will crash due to this bug.

  [Test Case]

  Change system timezone to Etc/UTC and attempt to launch gnome-
  calendar:

  ubuntu at ubuntu:/var/log$ sudo timedatectl set-timezone Etc/UTC
  ubuntu at ubuntu:/var/log$ timedatectl
                 Local time: Tue 2020-02-18 02:49:21 UTC
             Universal time: Tue 2020-02-18 02:49:21 UTC
                   RTC time: Tue 2020-02-18 02:49:22
                  Time zone: Etc/UTC (UTC, +0000)
  System clock synchronized: yes
                NTP service: active
            RTC in local TZ: no
  ubuntu at ubuntu:/var/log$ gnome-calendar
  **
  ERROR:../src/utils/gcal-date-time-utils.c:249:gcal_timezone_to_icaltimezone: assertion failed: (ical_tz != NULL)
  Bail out! ERROR:../src/utils/gcal-date-time-utils.c:249:gcal_timezone_to_icaltimezone: assertion failed: (ical_tz != NULL)
  Aborted (core dumped)

  [Regression Potential]

  The risk of regression is low due to the assert being removed and
  replaced with a default to UTC time if the previous timezone pointer
  is NULL. This is also only going to the focal development release,
  where any impact to real users will be low.

  [Other Information]

  There is an upstream issue open:

  https://gitlab.gnome.org/GNOME/gnome-calendar/issues/485

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