[Bugs] #1499 UNSP: incremental activity update

[Sugar Labs Bugs]

#1499: incremental activity update
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    Reporter:  dsd                        |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.82.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by dsd):

 One problem with this work is that it no longer uses unzip to extract zip
 files, it uses python internals. The unzip program parses various file
 attributes to set permissions and so on. Python classes do not do this.

 I suggest that Sugar be moved to using python zip file classes to unzip
 activities, parsing the important attributes as appropriate. This should
 not be difficult but will need testing. Then this could be applied at the
 same time.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1499#comment:1>
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