[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:  sascha_silbe               
        Type:  defect                     |         Status:  accepted                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-datastore            |        Version:  Git as of bugdate          
    Severity:  Critical                   |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by tomeu):

 Replying to [comment:1 sascha_silbe]:
 > We could modify metadatastore to ensure file content integrity even
 without data journalling (create new metadata directory, fsync() contents
 after writing, move new directory in place) but it would be a quite
 invasive patch, so
 > a) it won't make it into 0.86 and
 > b) I'm not sure it's worth the effort (with version support the impact
 will be much smaller and also easier to handle).

 c) if sugar can tolerate entries without any metadata, may be better to at
 least have the data file.

 Though, as Gary has mentioned that he has had several cases of this
 particular failure, I would suspect a bug in our DS, rather than general
 system flakiness.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1407#comment:2>
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