| 1 |
#!/bin/bash |
| 2 |
# $Id: libusbscanner,v 1.2 2004/08/26 10:26:08 twaugh Exp $ |
| 3 |
# |
| 4 |
# /etc/hotplug/usb/libusbscanner |
| 5 |
# |
| 6 |
# Sets up newly plugged in USB scanner so that the user who owns |
| 7 |
# the console according to pam_console can access it from user space |
| 8 |
# |
| 9 |
# Note that for this script to work, you'll need all of the following: |
| 10 |
# a) a line in the file /etc/hotplug/usermap that corresponds to the |
| 11 |
# camera you are using. |
| 12 |
# b) a setup using pam_console creates the respective lock files |
| 13 |
# containing the name of the respective user. You can check for that |
| 14 |
# by executing "echo `cat /var/{run,lock}/console.lock`" and |
| 15 |
# verifying the appropriate user is mentioned somewhere there. |
| 16 |
# c) a Linux kernel supporting hotplug and usbdevfs |
| 17 |
# d) the hotplug package (http://linux-hotplug.sourceforge.net/) |
| 18 |
# |
| 19 |
# In the usermap file, the first field "usb module" should be named |
| 20 |
# "libusbscanner" like this script. |
| 21 |
# |
| 22 |
|
| 23 |
if [ -z "${DEVICE}" ] |
| 24 |
then |
| 25 |
exit 0 |
| 26 |
fi |
| 27 |
|
| 28 |
DEVDIR=/dev |
| 29 |
DEVNAME="scanner-usb-$(echo ${DEVICE#../proc/bus/usb/} | sed -e 's;/;:;g')" |
| 30 |
|
| 31 |
wait_and_add () { |
| 32 |
local limit=90 |
| 33 |
# wait until the action can be performed but no longer |
| 34 |
# than $limit seconds |
| 35 |
while ! ln -snf "${DEVICE}" "${DEVDIR}/${DEVNAME}" ; do |
| 36 |
[ "$limit" = 0 ] && return |
| 37 |
sleep 1 |
| 38 |
limit=$((limit - 1)) |
| 39 |
done |
| 40 |
|
| 41 |
/sbin/pam_console_apply "${DEVDIR}/${DEVNAME}" |
| 42 |
} |
| 43 |
|
| 44 |
if [ "${ACTION}" = "add" ] && [ -f "${DEVICE}" ] |
| 45 |
then |
| 46 |
|
| 47 |
# Make a symlink from /dev/scanner-usb-BBB:DDD to /proc/bus/usb/BBB/DDD. |
| 48 |
# If /etc/security/console.perms is set up properly, pam_console will |
| 49 |
# follow the symlink and set the permissions of /proc/bus/usb/BBB/DDD such |
| 50 |
# that "console" users will be able to use their USB scanner. |
| 51 |
# |
| 52 |
# If the scanner is "cold plugged", and this event will occurred before |
| 53 |
# the root filesystem was writeable, then we wait in a background |
| 54 |
# until a link in ${DEVDIR} can be created. Permissions on |
| 55 |
# /proc/bus/usb/BBB/DDD will be of a "revert" type; see |
| 56 |
# man 5 console.perms. This is fine; when a device does not exist |
| 57 |
# at all we do not particularly care about its permissions. |
| 58 |
# |
| 59 |
( wait_and_add >/dev/null 2>&1 & ) |
| 60 |
|
| 61 |
# See /etc/hotplug/usb.agent for a description of how REMOVER works. |
| 62 |
ln -sf "${0}" "${REMOVER}" |
| 63 |
fi |
| 64 |
|
| 65 |
if [ "${ACTION}" = "remove" ] |
| 66 |
then |
| 67 |
rm -f "${DEVDIR}/${DEVNAME}" |
| 68 |
fi |
Parent Directory
| 
Revision Log
| 
Revision Graph
