I'm new to acl's so this is blackmagic to me. But what I have is a camera that I want to talk to.
So I got a netbooted debian machine:
ulf@term13:~(0)$ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 6.0.10 (squeeze) Release: 6.0.10 Codename: squeeze To that machine a I got a camera attached:
ulf@term13:~(0)$ lsusb | grep Nikon Bus 001 Device 092: ID 04b0:0428 Nikon Corp. ulf@term13:~(0)$ ls -alF /dev/bus/usb/001/092 crw-rw-r--+ 1 root root 189, 91 25 sep 10.05 /dev/bus/usb/001/092 Note the + at the end of the permissionstring crw-rw-r--+. That indicates that there is an ACL in work here:
ulf@term13:~(1)$ getfacl /dev/bus/usb/001/092 getfacl: Removing leading '/' from absolute path names # file: dev/bus/usb/001/092 # owner: root # group: root user::rw- user:knut:rw- group::rw- mask::rw- other::r-- Apparently the user knut has additional rw permissions here. But how did he get them?
I can set the same permissions to my user with setfacl. But whatever set like that will not be present after the camera has been reconnected. After toggling the camera on and off ones it actually gets mounted on another device:
ulf@term13:~(0)$ lsusb | grep Nikon Bus 001 Device 093: ID 04b0:0428 Nikon Corp. But the permissions for the new 093-device is the same as old 092 (without any extra permissions I added to the 092).
Is there some file where this is configured? This is setup by a sysadmin that is not present here any more so I need to fix it myself.
