command-not-found crashes when my locale is invalid

[Marius Gedminas]

I've these locale vars in my environment:

    $ env|grep ^LC_\\\|^LANG
    LC_MESSAGES=lt_LT.UTF-8
    LC_COLLATE=lt_LT.UTF-8
    LANG=en_US.UTF-8
    LC_CTYPE=lt_LT.UTF-8

When I ssh into a new Ubuntu 12.04 server install, that locale doesn't exist:

    $ locale charmap
    locale: Cannot set LC_CTYPE to default locale: No such file or directory
    locale: Cannot set LC_MESSAGES to default locale: No such file or directory
    locale: Cannot set LC_ALL to default locale: No such file or directory
    ANSI_X3.4-1968

I was trying to generate it and misspelled the command name, when suddenly command-not-found crashed:

    # localegen lt_LT.UTF-8
    Sorry, command-not-found has crashed! Please file a bug report at:
    https://bugs.launchpad.net/command-not-found/+filebug
    Please include the following information with the report:

    command-not-found version: 0.2.44

After I generated the locale, I was no longer able to reproduce the crash:

    # locale-gen lt_LT.UTF-8
    Generating locales...
      lt_LT.UTF-8... done
    Generation complete.

    # localegen lt_LT.UTF-8
    No command 'localegen' found, did you mean:
     Command 'locale-gen' from package 'locales' (main)
    localegen: command not found

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ma Hsiao-chun (mahsiaochun)]

A reliable way to reproduce is:
$ LANG=junk junk
Sorry, command-not-found has crashed! Please file a bug report at:
https://bugs.launchpad.net/command-not-found/+filebug
Please include the following information with the report:

command-not-found version: 0.3
Python version: 3.2.3 final 0
Distributor ID: Ubuntu
Description: Ubuntu 12.10
Release: 12.10
Codename: quantal
Exception information:

unsupported locale setting
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/CommandNotFound/util.py", line 24, in crash_guard
    callback()
  File "/usr/lib/command-not-found", line 69, in main
    enable_i18n()
  File "/usr/lib/command-not-found", line 40, in enable_i18n
    locale.setlocale(locale.LC_ALL, '')
  File "/usr/lib/python3.2/locale.py", line 541, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

Yes, probably no one would set LANG to "junk". But people may misspell locales and see the above daunting error message.

[Pius (pijus-navickas)]

Can't really tell anything except that I tried to use `unzip` command.
LC_PAPER=lt_LT.UTF-8
LC_ADDRESS=lt_LT.UTF-8
LC_MONETARY=lt_LT.UTF-8
LC_NUMERIC=lt_LT.UTF-8
LC_TELEPHONE=lt_LT.UTF-8
LC_IDENTIFICATION=lt_LT.UTF-8
LANG=en_GB.UTF-8
LC_MEASUREMENT=lt_LT.UTF-8
LANGUAGE=en_GB:en
LC_TIME=lt_LT.UTF-8
LC_NAME=lt_LT.UTF-8

command-not-found version: 0.3
Python version: 3.3.1 final 0
Distributor ID: Ubuntu
Description: Ubuntu 13.04
Release: 13.04
Codename: raring
Exception information:

unsupported locale setting
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/CommandNotFound/util.py", line 24, in crash_guard
    callback()
  File "/usr/lib/command-not-found", line 69, in main
    enable_i18n()
  File "/usr/lib/command-not-found", line 40, in enable_i18n
    locale.setlocale(locale.LC_ALL, '')
  File "/usr/lib/python3.3/locale.py", line 541, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

[Markus Wüstenberg (markus-o)]

I have the same output on Ubuntu 13.10:

Sorry, command-not-found has crashed! Please file a bug report at:
https://bugs.launchpad.net/command-not-found/+filebug
Please include the following information with the report:

command-not-found version: 0.3
Python version: 3.3.2 final 0
Distributor ID: Ubuntu
Description: Ubuntu 13.10
Release: 13.10
Codename: saucy
Exception information:

unsupported locale setting
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/CommandNotFound/util.py", line 24, in crash_guard
    callback()
  File "/usr/lib/command-not-found", line 69, in main
    enable_i18n()
  File "/usr/lib/command-not-found", line 40, in enable_i18n
    locale.setlocale(locale.LC_ALL, '')
  File "/usr/lib/python3.3/locale.py", line 541, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

[Enderson Maia (endersonmaia)]

Same error here.

:~$ whois
Sorry, command-not-found has crashed! Please file a bug report at:
https://bugs.launchpad.net/command-not-found/+filebug
Please include the following information with the report:

command-not-found version: 0.3
Python version: 3.3.2 final 0
Distributor ID: Ubuntu
Description: Ubuntu 13.10
Release: 13.10
Codename: saucy
Exception information:

unsupported locale setting
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/CommandNotFound/util.py", line 24, in crash_guard
    callback()
  File "/usr/lib/command-not-found", line 69, in main
    enable_i18n()
  File "/usr/lib/command-not-found", line 40, in enable_i18n
    locale.setlocale(locale.LC_ALL, '')
  File "/usr/lib/python3.3/locale.py", line 541, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting