[Bugs] #2074 NORM: Activity data directory should be deleted when an activity is deleted

[Sugar Labs Bugs]

#2074: Activity data directory should be deleted when an activity is deleted
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    Reporter:  bernie         |          Owner:  tch          
        Type:  defect         |         Status:  assigned     
    Priority:  Normal         |      Milestone:  0.90         
   Component:  sugar-toolkit  |        Version:  Unspecified  
    Severity:  Unspecified    |       Keywords:  sugar-love r?
Distribution:  Unspecified    |   Status_field:  Assigned     
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Comment(by garycmartin):

 Replying to [comment:4 erikos]:
 > About the concern for activities that don't use the journal losing data.
 An activity could store configurations in the bundle profile even though
 it does write to the Journal. Maybe the activity team can give his opinion
 on how the activities behave to evaluate what the bigger issue is.

 As a concrete if trivial example, the Moon activity stores some minimal UI
 state in its data directory in addition to the Journal entry. The main use
 case is for folks using Moon in the Southern hemisphere and their
 preference for viewing the moon rotated so that the its south pole is
 facing up. Storing this in the data directory allows future new sessions
 to start with the correct view orientation.

 If an activity is specifically erased by a user then it is understandable
 that this data may be removed (for the sake of maximising available
 storage space), though it would be frustrating if this was triggered
 unexpectedly by other less obvious Sugar actions (upgrading; deleting an
 .xo bundle from Journal; Backup/restore). Not sure how much sensitive data
 is kept around by other activities, other than TurtleArt using it for
 caching brick images (has to re render them all at launch time if
 deleted).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2074#comment:8>
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