On Thu, 29 Mar 2012 06:56:34 -0700, Chris Stratton wrote:

> On Wednesday, March 28, 2012 6:38:49 PM UTC-4, Hendrik Boom wrote:
>>
>> Instead of a user-id belonging to a human user, a user-id belong to an
>> application.  So even if they implemented "~" as a home directory
>> (which they may well do), it wouldn't deal with my case.
>>
> The more significant consequence of this is that because each app is
> generally it's own userid, there are a lot of mechanism in place to
> allow specific sharing across userids for the benefit of the human. 
> That would have to be seriously rethought before the device could have
> two humans with different access rights to content.  Or leaving alone
> rights, even different default responses.  You want to share that on
> facebook?  On who's facebook?

I'm not far enough into the development documentation yet, but presumably 
each app has its own home directory, or something like it, where it 
stores its temporary and persistent files.  Since user=specific data are 
there, the app would have to know how to distinguish between user-
specific and non-specific data.  Or android itself would have to make 
that distinction for it, and each user-app pair would effectively have to 
have its own user id.  Perhaps an app could then be a group?

This might have been possible from start, at the beginning of time, bu I 
suspect retrofitting all the existing android apps for this might well be 
too much for the ecosystem.

Not to mention the potential of Linus running out of user ids.  Are they 
still two-byte numbers?

-- hendrik

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