[Bug 1152722] Re: package-data-downloader does not handle network errors gracefully

[Daniel Richard G.]

That bug is about not using the system-configured HTTP proxy; this one
is about not handling network errors in general well (Python stack
traces are not supposed to be seen by end users). The two are related,
but still address distinct issues.

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https://bugs.launchpad.net/bugs/1152722

Title:
  package-data-downloader does not handle network errors gracefully

Status in “update-notifier” package in Ubuntu:
  New

Bug description:
  This concerns update-notifier-common 0.126 in Ubuntu Quantal.

  I got this e-mail message from a system running inside a corporate
  network that blocks outbound port 80 connections (a proxy is required
  for Web access):

  Subject: Anacron job 'cron.daily' on test-ubuntu64

  /etc/cron.daily/update-notifier-common:
  Traceback (most recent call last):
    File "/usr/lib/update-notifier/package-data-downloader", line 234, in process_download_requests
      dest_file = urllib.urlretrieve(files[i])[0]
    File "/usr/lib/python2.7/urllib.py", line 93, in urlretrieve
      return _urlopener.retrieve(url, filename, reporthook, data)
    File "/usr/lib/python2.7/urllib.py", line 239, in retrieve
      fp = self.open(url, data)
    File "/usr/lib/python2.7/urllib.py", line 207, in open
      return getattr(self, name)(url)
    File "/usr/lib/python2.7/urllib.py", line 344, in open_http
      h.endheaders(data)
    File "/usr/lib/python2.7/httplib.py", line 958, in endheaders
      self._send_output(message_body)
    File "/usr/lib/python2.7/httplib.py", line 818, in _send_output
      self.send(msg)
    File "/usr/lib/python2.7/httplib.py", line 780, in send
      self.connect()
    File "/usr/lib/python2.7/httplib.py", line 761, in connect
      self.timeout, self.source_address)
    File "/usr/lib/python2.7/socket.py", line 571, in create_connection
      raise err
  IOError: [Errno socket error] [Errno 111] Connection refused
  flashplugin-installer: downloading http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.2.202.273.orig.tar.gz

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