On 19-08-09 17:52:05, Eric Smith wrote:
I'm setting up a turnkey system that uses a Zebra brand USB barcode
printer. I need to use it without CUPS, directly printing from an
application. I've verified that this works when my application writes
to
/dev/usb/lp0. I've had to either run the application as root or
change the
permissions on /dev/usb/lp0. I though I could solve this problem by
using a
udev rule to recognize the printer, create a symlink, and set the
permissions. I created the following rule in
/etc/udev/rules.d/99-zebra.rules.
SUBSYSTEM=="usb", ACTION=="add", ATTRS{idVendor}=="0a5f",
ATTRS{idProduct}=="011c", MODE="0666", SYMLINK+="zebra
This sort of works, but not in any useful way. It does recognize the
printer, but instead of creating the symlink to /dev/usb/lp0 and
changing
the permission of that device file, it creates a symlink to e.g.
/dev/bus/usb/001/002, and sets the permissions of that. However, I
can't
print to /dev/bus/usb/001/002 (or the symlink to that). Printing to
/dev/usb/lp0 still works fine.
How do I write a udev rule that will set the permission of and
symlink to
/dev/usb/lp0 instead of the raw USB device?
I think you want to create a symlink from /dev/usb/lp0 to the new
device,
so instead of:
SYMLINK+="zebra
you want:
SYMLINK+="usb/lp0"
as on my system, /dev/cdrom is a symlink to /dev/sr0:
$ ll /dev/cdrom
lrwxrwxrwx. 1 root root 3 Aug 9 12:48 /dev/cdrom -> sr0
$ ll /dev/sr0
brw-rw----+ 1 root cdrom 11, 0 Aug 9 12:48 /dev/sr0
You may wish to set a group (and if need be make one) and set mode 660,
for a bit of security.
Note that I don't write UDEV rules myself; this is from looking around.
--
____________________________________________________________________
TonyN.:' <mailto:tonynelson@xxxxxxxxxxxxxxxxx>
' <http://www.georgeanelson.com/>
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