very simple datastore reimplementation

[C. Scott Ananian]

On Fri, May 9, 2008 at 2:26 PM, Joshua N Pritikin <jpritikin at pobox.com> wrote:
> On Fri, May 09, 2008 at 12:10:07PM -0600, Jameson Chema Quinn wrote:
>> To be more clear about this use case: I think that there should definitely
>> be a way for the onboard datastore to store the metadata for an absent file,
>> with hints about what place(s) to find that file (networked backup, sd
>> cards, usb devices) and how to recognize it when you do. This should include
>> the possibility for offloading old intermediate versions. Then, even when
>> you do not have access to the backup storage, you can see what you are
>> missing. This makes the result of suddenly yanking the SD card out more
>> well-defined (assuming no filesystem corruption), and means you do not ever
>> have to merge/separate two indexes (there is just one index).
>
> I was surprised to read this. My opinion is that the index should only
> include files which are available on local storage. Otherwise the index
> can fill up with broken links, and it will be difficult to explain why
> the broken links don't work. Access to backups is a good idea, but not
> via such a by-default mechanism.

http://wiki.laptop.org/go/Olpcfs#Absent_content_and_merging_remote_stores
 --scott

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