[Bugs] #1407 UNSP: Blanked metadata data-store entry damage (possibly caused during a shell crash)

[Sugar Labs Bugs]

#1407: Blanked metadata data-store entry damage (possibly caused during a shell
crash)
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    Reporter:  garycmartin                |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-datastore            |        Version:  Git as of bugdate          
    Severity:  Major                      |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 I've twice seen a case where a single data-store entry is corrupted by
 having its metadata files zeroed out. This causes the Journal to display
 it as a MIME data default document icon, with no title, and that randomly
 cycles through different colour schemes as you move the mouse cursor over
 it. You can not access it's details view, and it has no palette so you
 can't erase it via the UI. With a recent (today) build it's also now
 showing a 0% download grey bar as well.

 Finding and looking at the data-store entry in both cases showed the data
 was valid and intact (one case was a TA project, the other a Labyrinth
 mind-map). Looking at their metadata files, all were zero bytes, except
 for the checksum that looked like a valid hash.

 I think in both cases Sugar had previously crashed (sugar-jhbuild and
 either a full Fedora crash or a Xephyr black screen requiring a force
 quit). But am not 100% sure as I spotted the Journal entries a while
 later. I think it likely that the specific journal entry was also resumed
 at the time.

 Couple of screens shots attached. Will try to reproduce and get some logs
 to post if possible.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1407>
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