Metadata preserved across reboots?

Tomeu Vizoso tomeu at
Thu Feb 28 14:21:22 EST 2008

On Thu, Feb 28, 2008 at 8:02 PM, James Simmons
<jim.simmons at> wrote:
> Tomeu,
>  As I've mentioned before, I'm working on an EText reading activity that uses metadata to save the current page number when the activity closes, kind of like a bookmark.  When the activity is resumed the saved page number would be shown.  This works just fine while the XO is turned on, but the page number metadata disappears when you reboot or turn the machine off and on.  I'm using the same code that the Read activity does for this purpose, and I notice that Read has exactly the same problem.  This is frustrating.  The journal entry shows a screenshot of the page I left off on, but I don't go back to that page on opening.
>  I have also noticed that if I open the document from a USB card or an SD card no metadata is saved at all.

When is metadata not saved? Or you mean the metadata is saved but not retrieved?

>  I had been assuming that this was a bug in Sugar that would be fixed at some point.  Your text below makes it sound like this is an actual deliberate feature.  Am I understanding this correctly?

No, it's a big bug in the current implementation of the DataStore.
Could be fixed in the current implementation, but there have been
plans of rewriting it, so nobody has looked into this since a long
time ago.

See for more details.

>   I also went through a number of activity sources in git looking for
>  >  examples, but I didn't find one that ONLY used metadata. They all seem
>  >  to either not bother storing any UI state (so resuming or from new
>  >  makes no difference), or they save actual files.
>  I think at some point activities like those realize that they have
>  some data that would be better saved in a file.
>  But the determining reason would be that metadata properties other
>  than the custom ones are not preserved across reboots :/

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