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Bug#688217: Failure to create username with UTF-8 symbol

Package: wiki.debian.org
Severity: important

Tried to create a new user account with a UTF-8 character
(e.g. Flürble). This failed. Log excerpt:

mod_wsgi (pid=29720): Exception occurred processing WSGI script '/srv/wiki.debian.org/bin/moin.wsgi'.
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.5/werkzeug/wsgi.py", line 406, in __call__
    return self.app(environ, start_response)
  File "/usr/lib/pymodules/python2.5/MoinMoin/wsgiapp.py", line 282, in __call__
    response = run(context)
  File "/usr/lib/pymodules/python2.5/MoinMoin/wsgiapp.py", line 88, in run
    response = dispatch(request, context, action_name)
  File "/usr/lib/pymodules/python2.5/MoinMoin/wsgiapp.py", line 136, in dispatch
    response = handle_action(context, pagename, action_name)
  File "/usr/lib/pymodules/python2.5/MoinMoin/wsgiapp.py", line 195, in handle_action
    handler(context.page.page_name, context)
  File "/usr/lib/pymodules/python2.5/MoinMoin/action/newaccount.py", line 256, in execute
    request.theme.add_msg(_create_user(request), "dialog")
  File "/usr/lib/pymodules/python2.5/MoinMoin/action/newaccount.py", line 140, in _create_user
    theuser.account_creation_host], shell=False, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  File "/usr/lib/python2.5/subprocess.py", line 594, in __init__
    errread, errwrite)
  File "/usr/lib/python2.5/subprocess.py", line 1153, in _execute_child
    raise child_exception
TypeError: execv() arg 2 must contain only strings

Looks like a bug in the interface to account creation checking. Sigh.

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

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