on error, conjure-up presents 'quit' option that doesn't quit

[Steve Langasek]

while trying to conjure-up a bundle on a network with very bad packet loss, I hit a timeout trying to connect to the charm store. conjure-up gave me a helpful error message explaining the problem, and the option to 'Quit'.

Selecting 'Quit' did not actually quit conjure-up; instead I got the following output, and then conjure-up hung:

Exception in ev.run():
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/ubuntui/ev.py", line 83, in run
    cls.loop.run()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 278, in run
    self._run()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 376, in _run
    self.event_loop.run()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 1326, in run
    self._loop.run_forever()
  File "/usr/lib/python3.5/asyncio/base_events.py", line 413, in run_forever
    self._run_once()
  File "/usr/lib/python3.5/asyncio/base_events.py", line 1394, in _run_once
    handle._run()
  File "/usr/lib/python3.5/asyncio/events.py", line 126, in _run
    self._callback(*self._args)
  File "/usr/lib/python3/dist-packages/urwid/raw_display.py", line 393, in <lambda>
    event_loop, callback, self.get_available_raw_input())
  File "/usr/lib/python3/dist-packages/urwid/raw_display.py", line 493, in parse_input
    callback(processed, processed_codes)
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 403, in _update
    self.process_input(keys)
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 503, in process_input
    k = self._topmost_widget.keypress(self.screen_size, k)
  File "/usr/lib/python3/dist-packages/urwid/wimp.py", line 643, in keypress
    return self._current_widget.keypress(size, key)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1128, in keypress
    return self.body.keypress( (maxcol, remaining), key )
  File "/usr/lib/python3/dist-packages/urwid/decoration.py", line 836, in keypress
    return self._original_widget.keypress((maxcol,), key)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1587, in keypress
    key = self.focus.keypress(tsize, key)
  File "/usr/lib/python3/dist-packages/urwid/decoration.py", line 621, in keypress
    return self._original_widget.keypress(maxvals, key)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1587, in keypress
    key = self.focus.keypress(tsize, key)
  File "/usr/lib/python3/dist-packages/urwid/wimp.py", line 535, in keypress
    self._emit('click')
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 463, in _emit
    signals.emit_signal(self, name, self, *args)
  File "/usr/lib/python3/dist-packages/urwid/signals.py", line 264, in emit
    result |= self._call_callback(callback, user_arg, user_args, args)
  File "/usr/lib/python3/dist-packages/urwid/signals.py", line 294, in _call_callback
    return bool(callback(*args_to_pass))
  File "/usr/lib/python3/dist-packages/ubuntui/views/error.py", line 42, in cancel
    raise SystemExit("Install exited because of error.")
SystemExit: Install exited because of error.
Install exited because of error.

Hitting ^C then gets me the following further traceback:

^CError in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 39, in _python_exit
    t.join()
  File "/usr/lib/python3.5/threading.py", line 1054, in join
    self._wait_for_tstate_lock()
  File "/usr/lib/python3.5/threading.py", line 1070, in _wait_for_tstate_lock
    elif lock.acquire(block, timeout):
KeyboardInterrupt

[Adam Stokes (adam-stokes)]

https://github.com/conjure-up/conjure-up/issues/607