Tony Nelson writes:
On 18-11-11 18:43:45, Sam Varshavchik wrote:I'm trying to get NUT running. It fails to start because it setuids itself to the nut user and then attempts to open the USB device node, /dev/bus/usb/006/001 This fails with EACCESS because: [root@monster tmp]# ls -al /dev/bus/usb/006/001 crw-rw-r--+ 1 root root 189, 640 Nov 11 13:49 /dev/bus/usb/006/002 [root@monster tmp]# getfacl /dev/bus/usb/006/002 getfacl: Removing leading '/' from absolute path names # file: dev/bus/usb/006/002 # owner: root # group: root user::rw- group::rw- group:lirc:rw- mask::rw- other::r--So the ACLs give access to USB devices to the 'lirc' user, and 'nut' can't open this.... I don't know about ACLs, but how about: setfacl -m u:nut:rw /dev/bus/usb/006/001 from `man setfacl`
That'll work until the next reboot, when everything gets reset.Anyway, after poking around I found /usr/lib/udev/rules.d. nut installed a nice config file in there that enumerated all the USB vendor+product IDs and made the corresponding USB device nodes' permissions accessible to nut.
Unfortunately, the lirc-core package installed its own set of rules that overrode that, and, somewhat aggresively, claimed all usb devices for its own use, and reset their ACLs. This is a bug in the lirc-core package, and fully uninstalling lirc-core fixed this. Created bug 1648766 to document this.
P.S. This is really an awesome directory to dump configuration files into: /usr/lib/udev/rules.d. Apparently, /etc is not good enough, for udev.
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