Alberto Hernando wrote:
I'm trying to connect to my digital camera using digikam&gphoto, and I have a
problem with permissions, because root can access. When I connect the camera,
I get a /dev/usbdevX device, owned by root.root and with 660. I've read all
my udev rules and there is nothing for this, so I don't know what to do. I
tried to install the latest udev (kernel i 2.6.16) but it conflicts with
hotplug and even if I remove the hotplug init script, the system doesn't work
well, or doesn't boot. So I'm bak to udev-056. What do I need to do to access
my camera?
The answer depends upon the kernel and udev/hotplug version.
Old-style setup, works with any kernel and udev version (in fact, it works even
without udev/hotplug):
Please be sure that there is a /proc/bus/usb line in /etc/fstab, and it mentions
the "14" gid and "660" permissions. This creates pseudofiles like
/proc/bus/usb/001/002 owned by the "usb" group. Add yourself to this group in
order to use your camera. There were racy and non-working attempts to change
permissions from hotplug scripts, they are not in the book.
New-style setup (linux >=2.6.14, udev >=081 and libusb >=0.1.12 are needed):
Please be sure that you have the long rule mentioned in
http://wiki.linuxfromscratch.org/blfs/ticket/1680. This will create symlinks
like /dev/bus/usb/1/2 -> /dev/usbdev1.2 to files owned by the "usb" group. Add
yourself to this group in order to be able to use the devices. There is also a
(currently debian-specific) script that generates udev rules for all known
cameras and specifies a different group. You can do it yourself for your camera,
matching on vendor and product IDs, like this:
# UMAX AstraPix 320s
BUS=="usb", SYSFS{idVendor}=="0d64", SYSFS{idProduct}=="1001", MODE="0660",
GROUP="camera"
This rule catches all PTP cameras:
# USB PTP Class Camera
BUS=="usb", SYSFS{bDeviceClass}=="06", MODE="0660", GROUP="camera"
--
Alexander E. Patrakov
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