How to change XDG_RUNTIME_DIR permissions

[smcv@xxxxxxxxxxxxx (Simon McVittie)]

On Mon, 09 Apr 2018 at 17:27:10 +0000, john terragon wrote:
> created by the logind service.I want to make the socket of the pulseaudio
> server of one particular user available to all the others.

This is basically PulseAudio system-wide mode:
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/SystemWide/
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/WhatIsWrongWithSystemWide/

... except worse, because instead of potentially being able to escalate
privileges to a dedicated system uid that runs the PulseAudio system
server, you can potentially escalate privileges to the account of
another user.

I would suggest using the system-wide mode instead: it's a bad idea
for all the reasons listed in the link above, but seems less bad than
reinventing it via a user's account.

    smcv