On Fri, 4 Sep 2020 16:40:00 +0200 Lennart Poettering <lennart@xxxxxxxxxxxxxx> wrote: > On Di, 26.05.20 16:55, Pekka Paalanen (ppaalanen@xxxxxxxxx) wrote: > > > Hi, > > > > I'm looking at letting Weston's 'meson test' run DRM-backend tests > > automatically and without the need of root privileges. I have a spare > > DRM device in my machine that is dedicated for this purpose, so I make > > my normal desktop environment not touch it. My problem is, is there any > > way to set up things so that logind would give Weston access to that > > DRM device while my normal desktop is active? > > I am not aware of any. > > > Any suggestions on what might work? > > Other than patching logind with some new concept, no suggestion. Or > simply bypassing logind and opening the devices directly with root > privs? or test this in virtualization? Thanks for the reply! That's a little inconvenient. I was hoping there might be a way somehow, perhaps even create a new session and become its controller without elevated privileges if the the seat in question is not "in use". I could configure the extra DRM device into a non-default seat, then try taking over that seat. Is that really not possible without some kind of elevated privileges my normal desktop user doesn't usually have? Could it be allowed via polkit configuration or something? Or maybe I indeed need to forget about logind and open the DRM device as a normal user. After all, the first one to open a DRM device should automatically gain DRM master status, and there have been recent kernel patches to even allow dropping and re-gaining DRM master status without being root/CAP_SYS_ADMIN IIUC. That won't help with input devices if I wanted to test anything interactive... but maybe I could allow some dedicated input devices to be opened by my normal user and make sure I don't use those for my desktop. Right, maybe I can hack it up after forgetting about logind. Put all those devices into a non-default seat, override their file permissions, and assume they are untrusted (can be eavesdropped). Thanks, pq
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