[Bugs] #1562 UNSP: Ensure that datastore initialization is written completely to disk

[Sugar Labs Bugs]

#1562: Ensure that datastore initialization is written completely to disk
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    Reporter:  sayamindu                  |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-datastore            |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 If a filesystem corruption occurs just after the datastore has been
 written after first boot, on subsequent boots, Sugar refuses to start and
 the display-manager gets into an unending loop, making recovery without a
 reflash/re-install very difficult.

 We can make the chances of this happening less by calling sync() after the
 datastore initialization, and also making the get_version() method more
 robust.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1562>
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