[Bugs] #1876 UNSP: Failure to cleanup temporary files after filesystem full errors

[Sugar Labs Bugs]

#1876: Failure to cleanup temporary files after filesystem full errors
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    Reporter:  bernie                     |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.84.x                     
    Severity:  Critical                   |       Keywords:  sugar-0.84                 
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by bernie):

 > We should also check what happens if the unpacks dies mid-way
 > without clean-up, e.g. due to power loss. A quick glance at
 > the code suggests it will try to run the incomplete copy,
 > never unpacking it cleanly (without manual intervention).

 I'm attaching a trivial patch to take care of the crash case.

 While this doesn't completely fix the bug, it lowers its severity down to
 a non-blocker because now users can recover their systems by simply
 rebooting them.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1876#comment:7>
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