User bus conclusion

[Thiago Macieira]

On Wednesday, 10 de November de 2010 03:29:24 David Zeuthen wrote:
> FWIW, I don't think it's helpful changing the session bus scope -
> especially not as it's already defined in the D-Bus spec (as being
> one-to-one with the (X server instance, uid) pairs).

But you see, that is still the case with this proposal. You've already 
proposed that an unset DISPLAY means reusing the one from the user's 
XDG_RUNTIME dir.

Moreover, since there's only one bus running, even if you had a different 
DISPLAY set, such as ssh -X into the machine, or by su from another user's 
graphical login, trying to access any already-running services would result in 
them being shown in the original X display. (This is in fact an existing and 
working use-case I use today but that would be broken by this proposal)

Anyway, the point is that we're restricting everything one user does to the 
same session. What we previously considered "starting a new session" now 
changes into "joining the running session". Therefore, it still matches the 
session bus goals.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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