Re: Run script when USB scanner unplugged

[Bertrik Sikken <bertrik@zonnet.nl>]

Ian Pilcher wrote:

> Greg KH wrote:
> 
>> On Wed, Jun 02, 2004 at 03:28:00PM -0500, 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.
>>
>>
>>
>> There is no /dev node for a USB scanner anymore, as there is no kernel
>> driver for it in 2.6.  Do you realize this?  Because of this, modifying
>> the hotplug scripts will be quite difficult, and udev will know nothing
>> about this kind of device, sorry.
>>
> 
> /etc/hotplug/usb/libusbscanner, as shipped with Fedora Core 2, already
> sets the ownership of the appropriate /proc/bus/usb/... file to the
> "console" user.  This works fine when a scanner is plugged in *after*
> the user has logged on.
> 
> I've hacked /etc/hotplug/usb/libusbscanner to create a symbolic link
> from /dev/usb/scanner-%sys%devices%pci%... to that /proc/bus/usb...
> file.  When the USB "insertion" is processed during system boot, the
> symlink gets created.  Then when a "console" user logs on, PAM follows
> the symlink and sets the ownership of the /proc/bus/usb... file
> appropriately.
> 
> All I want to do is run a script during the USB "remove" event to get
> rid of this symlink.  Reading through /etc/hotplug/usb.agent, it looks
> like I should be able to put a script in the location specified by the
> ${REMOVER} variable, but I've tried this and it never gets executed.
> 
> What do I need to do?

I'm not really an expert with hotplug, however I got remove to work
after a bit of experimentation (and some minimal testing).
On the 'add' event, the user script create a symbolic link at
$REMOVER to itself. When the remove occurs, the same script is
called again, but now with ACTION=remove.

Kind regards,
Bertrik

(my script follows)

#!/bin/bash

# hack: wait 1 second to improve chance that /proc/bus/usb file is 
present during add
sleep 1

# handle add event
if [ "${ACTION}" = "add" ] && [ -f "${DEVICE}" ]
then
	logger -t netmd NetMD plugged in at $DEVICE
	chown root.usb $DEVICE
	chmod ug+w $DEVICE
	# create symbolic link for remove event
	ln -s /etc/hotplug/usb/minidisc $REMOVER
fi

# handle remove event
if [ "${ACTION}" = "remove" ]
then
	logger -t netmd NetMD unplugged from $DEVICE
fi



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