Bug 826265 added the v4l2loopback driver to the Linux test slaves. Unfortunately /dev/video0 is chmod 0600, with group "video", which cltbld is not currently in. There are two easy ways to fix this: a) Add cltbld to the video group b) Use a udev rule to chmod it 0666 Attached is a udev rule you can drop in /etc/udev/rules.d/ to do the latter. I don't care which way you fix it, they should both work fine.

This is for the ubuntu ec2 linux slaves, right?

Correct, sorry.

I also need cltbld to be in the audio group, as it turns out. (Could probably fudge this with udev magic as well, but I haven't tested.)

If I had to guess, probably just: SUBSYSTEM=="sound" MODE="0666"

Comment on attachment 740391 [details] [diff] [review] [puppet] add cltbld to ['video','audio'] groups on Ubuntu 302 dustin, since he is the initial author of that module.

Comment on attachment 740391 [details] [diff] [review] [puppet] add cltbld to ['video','audio'] groups on Ubuntu This seems plausible, although I don't speak puppet specifically.

Test results... Prior to the patch: cltbld@tst-linux64-ec2-003:~$ groups cltbld With the patch applied: cltbld@tst-linux64-ec2-001:~$ groups cltbld audio video Also tested on Linux and Mac build slaves to confirm no changes will be made (we only want to update Ubuntu build slaves).

Comment on attachment 740391 [details] [diff] [review] [puppet] add cltbld to ['video','audio'] groups on Ubuntu Landed in http://hg.mozilla.org/build/puppet/rev/1148b6746afa