[Bug 1806076] Re: unattended-upgrade --help raises UnicodeEncodeError when stdout encoding is ascii

[Julian Andres Klode]

I installed 1.6.13 and could verify that the regression wrt --help is
fixed. unattended-upgrades still logged a lot of errors because for some
reason gettext returned utf8 despite being on non-UTF-8 locale, but
that's all from the APT side.

** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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Title:
  unattended-upgrade --help raises UnicodeEncodeError when stdout
  encoding is ascii

Status in apt package in Ubuntu:
  Fix Released
Status in unattended-upgrades package in Ubuntu:
  Won't Fix
Status in apt source package in Xenial:
  New
Status in unattended-upgrades source package in Xenial:
  Won't Fix
Status in apt source package in Bionic:
  Fix Committed
Status in unattended-upgrades source package in Bionic:
  Won't Fix

Bug description:
  [Impact]

   * unattended-upgrades --help crashes in apt.systemd.daily script when
  locale is not in UTF-8.

  [Test Case]

  In the fixed case no crash is observed.

  rbalint at yogi:~$ lxc launch ubuntu:18.04 bb-lp-1806076
  Creating bb-lp-1806076
  Starting bb-lp-1806076
  rbalint at yogi:~$ lxc shell bb-lp-1806076
  mesg: ttyname failed: No such device
  root at bb-lp-1806076:~# apt install -yqq language-pack-ru-base
  The following package was automatically installed and is no longer required:
    libfreetype6
  Use 'apt autoremove' to remove it.
  The following additional packages will be installed:
    language-pack-ru
  The following NEW packages will be installed:
    language-pack-ru language-pack-ru-base
  0 upgraded, 2 newly installed, 0 to remove and 7 not upgraded.
  Need to get 2310 kB of archives.
  After this operation, 11.8 MB of additional disk space will be used.
  Selecting previously unselected package language-pack-ru-base.
  (Reading database ... 28536 files and directories currently installed.)
  Preparing to unpack .../language-pack-ru-base_1%3a18.04+20180712_all.deb ...
  Unpacking language-pack-ru-base (1:18.04+20180712) ...
  Selecting previously unselected package language-pack-ru.
  Preparing to unpack .../language-pack-ru_1%3a18.04+20180712_all.deb ...
  Unpacking language-pack-ru (1:18.04+20180712) ...
  Setting up language-pack-ru (1:18.04+20180712) ...
  Setting up language-pack-ru-base (1:18.04+20180712) ...
  Generating locales (this might take a while)...
    ru_RU.UTF-8... done
    ru_UA.UTF-8... done
  Generation complete.

  root at bb-lp-1806076:~# echo LANG=ru_RU | tee /etc/default/locale
  LANG=ru_RU
  root at bb-lp-1806076:~#
  /usr/lib/apt/apt.systemd.daily update
  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 2171, in <module>
      (options, args) = parser.parse_args()  # type: ignore
    File "/usr/lib/python3.6/optparse.py", line 1387, in parse_args
      stop = self._process_args(largs, rargs, values)
    File "/usr/lib/python3.6/optparse.py", line 1427, in _process_args
      self._process_long_opt(rargs, values)
    File "/usr/lib/python3.6/optparse.py", line 1501, in _process_long_opt
      option.process(opt, value, values, self)
    File "/usr/lib/python3.6/optparse.py", line 785, in process
      self.action, self.dest, opt, value, values, parser)
    File "/usr/lib/python3.6/optparse.py", line 807, in take_action
      parser.print_help()
    File "/usr/lib/python3.6/optparse.py", line 1647, in print_help
      file.write(self.format_help())
  UnicodeEncodeError: 'ascii' codec can't encode characters in position 126-133: ordinal not in range(128)

  root at bb-lp-1806076:~# echo LANG=ru_RU.UTF-8 | tee /etc/default/locale
  LANG=ru_RU.UTF-8
  root at bb-lp-1806076:~# /usr/lib/apt/apt.systemd.daily update
  root at bb-lp-1806076:~#

  [Where problems could occur]

  * Nowhere, really. The fix is setting LC_ALL=C.UTF-8 for u-u --help
  and it is processed by grep then.

  [Original Bug Text]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.1ubuntu1.18.04.6, the problem page at https://errors.ubuntu.com/problem/b3e3265e302351558260f54ae37c7b4c193dfc95 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

  Also seen in:
   * https://errors.ubuntu.com/problem/936bb1c75c4efe018f968a5773b820bcf52c298a

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