Ian Pilcher wrote:
> Running Fedora Core 2 here.  I've found that the hotplug scripts shipped
> with the distribution do a fine job of setting the permissions when a
> USB scanner is plugged in *after* a user has logged in.  Unfortunately,
> this is not the most common usage scenario; I leave my scanner plugged
> in pretty much all the time, and I suspect that most other users do the
> same.
> 
> What's needed, at least on Red Hat/Fedora Core systems, is a symlink
> which will tell PAM to adjust the permissions when a "console" user logs
> in.  I've hacked /etc/hotplug/usb/libusbscanner to do the following when
> a scanner is plugged in:
> 
>     DEVID="${REMOVER#/var/run/usb/}"
>     rm -f "/dev/usb/scanner-${DEVID}"
>     ln -s "${DEVICE}" "/dev/usb/scanner-${DEVID}"
> 
> So far so good.  The link is created when the system boots, and PAM
> follows it and sets the device permissions properly when a "console
> user" logs in.
> 
> Now I want to remove the link when (if) the scanner is unplugged.  I've
> tried adding an 'if [ "${ACTION}" = "remove ]' section to
> /etc/hotplug/usb/libusbscanner, but that script doesn't appear to get
> executed when a USB scanner is unplugged.
> 
> What do I need to do?
> 
> Thanks!
> 

Install the FC2 udev rpm... read the manpage and add a *.rule file to 
/etc/udev/rules.d . Also add your scanner to /etc/security/console.perms 
(man 5 console.perms).