On Thursday 18 January 2007 22:13, Mikkel L. Ellertson wrote: > Anne Wilson wrote: > > I use a video capture card for my analogue camcorder, and a webcam. > > Udev's habit of randomly setting video0 and video1 are a problem, so > > after a good bit of reading I set out to create persistent symlinks. The > > idea is that the device is recognised and the link is made to whichever > > video* is appropriate. The links are created, but there are problems. > > > > First, /dev/DC10plus does not get removed at shutdown. I'm not sure > > about /dev/webcam, I haven't seen any error messages (though I haven't > > thoroughly examined the logs). Looking at the permissions on the > > links,they are owned root:root. > > > > lrwxrwxrwx 1 root root 14 Jan 18 16:39 /dev/DC10plus -> mapper/control > > lrwxrwxrwx 1 root root 6 Jan 18 16:39 /dev/webcam -> video0 > > > > If I chown to anne:root they are properly deleted on shutdown. > > > > Attempting to use /dev/DC10plus gives me these errors: > > > > **ERROR: [lavrec] Error opening video-device (/dev/DC10plus): Permission > > denied > > **ERROR: [lavrec] Something went wrong while setting up the card > > > > After chown: > > > > **ERROR: [lavrec] Error setting channel: Permission denied > > **ERROR: [lavrec] Something went wrong while setting up the card > > > > It all seems to revolve around permissions. Also, it looks as though > > anne may need to own the link in order to use it. If so, I have to find > > some way of that being automatically set. > > > > Any thoughts? > > > > Anne > > When you are using symlinks, the permissions that matter are the > permissions of the file the link points to. You can not set the > permissions of the symlink. You can set the permissions of the > device in the udev rules. But you have to be careful because some > devices get the permission changed by console.perms, so the udev > permissions do not have any affect. Changing the permissions as root > will only last until the owner of the console changes. Then > console.perms will reset them. > Hmm - console.perms. That's ringing a bell. I believe that I used to set in there files whose perms I didn't want to be changed. ISTR setting some things as group video, which saved a lot of problems. Anne
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