Depending on the packaging of tzdata, /usr/share/zoneinfo/tzdata.zi may reference zones or links that are not actually present on the system. E.g. on Debian and Ubuntu, there is a tzdata-legacy package that contains "legacy" zones and links, but they are still referenced in /usr/share/zoneinfo/tzdata.zi shipped by the main tzdata package. Right now, get_timezoes() does not validate timezones when building the list, which makes the following possible: $ timedatectl list-timezones | grep "US/Alaska" US/Alaska $ timedatectl set-timezone US/Alaska Failed to set time zone: Invalid or not installed time zone 'US/Alaska' which feels buggy. Hence, simply validate timezones in get_timezones() to avoid listing timezones that are not installed.
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