Hi there, I know this question comes up once in a while, but I think it never produced a valid solution.
Just a recap of which are the presupposition: it has always been suggested to run Rivendell under dedicated user, something like a system user, different from the one which is 'graphically' logged in. For example you may want a simple-and-not-privileged user called 'studio', which cannot touch /var/snd folder. It can of course launch all Rivendell UI modules, and actually it does. On the other hand Rivendell daemons, caed/ripcd/rdcatchd run under 'rivendell' user, who hasn't any active X session, and it is the owner of /var/snd. A nice way of accomplish this security framework is to setuid the three binary daemons with chown rivendell:rivendell and then chmod 4755. So far, so good. Any problem with the above scenario? Are there newer recommendations? Problems come up if you want to use jack server to handle audio resources. In fact, any applications looking for a jack server can only see instances running under the same user identity. If 'studio' runs 'jackd', this cannot be seen by 'caed', which is launched by 'rivendell'. You need to setuid also jackd the same way you did for caed. This is the only solution I found. But as you can imagine, this workaround leads to a domino effect, where any jack-related application must be setuid, otherwise it cannot work. And of course you cannot use any graphical tool, like qjackctl/patchage since they need an X server owned by the same jack-server user. There is another strange behavior I need to investigate better (you may confirm). If jack server is not setuid (just chmod 0755), and launched through systemd with a specific user, then caed cannot see it, even though users match. But this is not a big deal in the end. It is a pity. Jack is a very versatile tool. Since the computer is used for production purposes, I really would like users to listen to Youtube with the same audio card linked to RDLibrary. Now: what do you suggest? Thank you Alessio
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