ubuntu-phone team mailing list archive

[Ken VanDine <ken.vandine@xxxxxxxxxxxxx>]

Content hub attempts to create a link instead of a copy and falls back to a
copy if the link fails.  The link fails if it's across different file
systems.  What we really need here is for the destination app that is
opening the content to send that content to a location it has access too on
the same device/filesystem.  So we should be creating a link in a app
specific location on the sdcard to prevent that copy.  This is something we
need to add support for in the ContentStore API and get apps using it.
This is an area we should really address ASAP.

Ken

On Tue, Apr 12, 2016 at 9:38 AM, Ted Gould <ted@xxxxxxxxxx> wrote:

> On Tue, 2016-04-12 at 14:57 +0300, Alberto Mardegan wrote:
>
> To make things more complicated, this exception should not be made on
> the content type, but on the receiving application: if one implements
> another video player application (in a normally confined click package)
> and it's asked to open the file via the url-dispatcher, it might not
> have the permissions to do so.
>
> I can see two possible solutions:
>
> Make URL-dispatcher smarter: on "file://" urls, if the file is
> unreadable by the receiving app...
>
>   A) ... url-dispatcher somehow modifies the apparmor policy of the
>      receiving app, to grant it read access to the file.
>   B) ... url-dispatcher creates a copy of the file in a directory
>      readable by the receiver, and modifies the URL accordingly.
>
> And actually, the content-hub could operate in a similar way: if we
> could alter the apparmor rules of the receiver application, we could
> avoid copying the files and just grant read-access to the app.
>
>
> URL Dispatcher is only for cases where we switch applications and pass
> some additional details along with that switch. Content Hub handles content
> between application contexts.
>
> Certainly Content Hub could not do copies in some cases. And we've talked
> about it quite a few times before, it just has to make it to the top of the
> TODO list.
>
> Ted
>
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