[Bugs] #3301 UNSP: Sugar doesn't start up if ~/.sugar/default/nm/connections.cfg was written by previous version

[Sugar Labs Bugs]

#3301: Sugar doesn't start up if ~/.sugar/default/nm/connections.cfg was written
by previous version
------------------------------------------+---------------------------------
    Reporter:  sascha_silbe               |          Owner:  m_anish                    
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Dextrose                   |        Version:  Git as of bugdate          
    Severity:  Blocker                    |       Keywords:                             
Distribution:                             |   Status_field:  New                        
------------------------------------------+---------------------------------
 When updating from a previous version of Sugar, Sugar will fail to start
 up at all if {{{~/.sugar/default/nm/connections.cfg}}} contains any
 network:

 {{{
 Traceback (most recent call last):
   File "/home/sascha.silbe/sugar-jhbuild/install/bin/sugar-session", line
 329, in <module>
     main()
   File "/home/sascha.silbe/sugar-jhbuild/install/bin/sugar-session", line
 305, in main
     home_window = homewindow.get_instance()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/desktop/homewindow.py", line 244, in get_instance
     _instance = HomeWindow()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/desktop/homewindow.py", line 79, in __init__
     self._mesh_box = MeshBox()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/desktop/meshbox.py", line 460, in __init__
     netmgr_observer.listen()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/desktop/meshbox.py", line 323, in listen
     settings = network.get_settings()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/model/network.py", line 826, in get_settings
     load_connections()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/model/network.py", line 975, in load_connections
     load_wifi_connections()
   File "/home/sascha.silbe/sugar-jhbuild/install/lib/python2.6/site-
 packages/jarabe/model/network.py", line 922, in load_wifi_connections
     value = eval(config.get(section, 'proto'))
   File "<string>", line 1, in <module>
 NameError: name 'rsn' is not defined
 }}}

 This is because the patch to add support for WPA-Enterprise changed the
 configuration syntax without any upgrade path.

 Also, because the new syntax is not backwards-compatible, it also makes
 testing the Dextrose version of Sugar in sugar-jhbuild cumbersome: as
 Sugar 0.94 (using NM 0.8) doesn't work with system settings, the user
 (developer) needs to have two different versions of
 {{{~/.sugar/default/nm/connections.cfg}}}, switching them whenever they
 change between Dextrose and upstream branches.

-- 
Ticket URL: <http://bugs.sugarlabs.org/ticket/3301>
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