Bug 14370

Hello,

in my CentOS 8 setup, the script 'bitbake/lib/toaster/toastermain/settings.py' generates the following exception on start:

  File "/home/paolo/poky/bitbake/lib/toaster/toastermain/settings.py", line 86, in <module>
    if pytz.timezone(zonename) is not None:
  File "/usr/lib/python3.6/site-packages/pytz/__init__.py", line 168, in timezone
    _tzinfo_cache[zone] = build_tzinfo(zone, fp)
  File "/usr/lib/python3.6/site-packages/pytz/tzfile.py", line 33, in build_tzinfo
    assert magic == _byte_string('TZif'), 'Got magic %s' % repr(magic)
AssertionError: Got magic b'# Al'

After digging for a while, I found that the above assertion is generated because the folder /usr/share/zoneinfo, that is scanned by the script, contains files that are not timezone descriptors, like for example 'leapseconds', 'zone1970.tab' and 'zone.tab'.

It is possible to avoid this error by exporting the timezone with:
TZ='Europe/Rome'; export TZ

It would be better to modify the script like this:

            try:
                import pytz
                from pytz.exceptions import UnknownTimeZoneError
                try:
                    if pytz.timezone(zonename) is not None:
                        zonefilelist[hashlib.md5(open(filepath, 'rb').rea$
                except UnknownTimeZoneError as ValueError:
                    # we expect timezone failures here, just move over
                    pass
  -->           except AssertionError:
  -->               # there may be files in the folder that generate assertion
  -->               pass
            except ImportError:
                zonefilelist[hashlib.md5(open(filepath, 'rb').read()).hex

Regards,
Paolo