Re: udev remove problems

[Juergen Bausa <Juergen.Bausa@web.de>]

> -----Ursprüngliche Nachricht-----
> Von: "Kay Sievers" <kay.sievers@vrfy.org>
> Gesendet: 26.08.07 00:42:51
> An: "Juergen Bausa" <Juergen.Bausa@web.de>
> CC: linux-hotplug-devel@lists.sourceforge.net
> Betreff: Re: udev remove problems


> 
> On 8/26/07, Juergen Bausa <Juergen.Bausa@web.de> wrote:
> > udev remove problems
> >
> > I am using udev 0.105-4 on debian etch. I am trying to setup rules for pvr (hard disk recorder)
> > that is connected to my system via usb. Add and remove events should start scripts. The add
> > event works fine:
> >
> > ACTION="add", SYSFS{idVendor}="11db", SYSFS{idProduct}="1000", MODE="0660", \
> >   GROUP="toppy", RUN+="/usr/local/bin/tf5000pvr_udev"
> >
> > In my first try, I used the following for remove:
> >
> > ACTION="remove", SYSFS{idVendor}="11db", SYSFS{idProduct}="1000",  \
> >   RUN+="/usr/local/bin/tf5000pvr_udev"
> >
> > This did not work (in the case of remove nothing happens). I think its because sysfs
> > values are already gone in case of an remove event. I found a hint on this on the web
> > and tried the following:
> >
> > ACTION="add", SYSFS{idVendor}="11db", SYSFS{idProduct}="1000", MODE="0660", \
> >   GROUP="toppy", RUN+="/usr/local/bin/tf5000pvr_udev", ENV{toppy}="%p"
> >
> > ACTION="remove", ENV{toppy}="%p" , RUN+="/usr/local/bin/tf5000pvr_udev"
> 
> > So, the variable is saved and found on the remove event, but the script isnt called. What is wrong here?
> 
> The string you compare against may not run through the format char
> replacement, not sure. Just do ENV{toppy}="?*", or use the
> ENV{REMOVE_CMD}="/usr/local ..." which Debian supports. So you don't
> need a separate remove rule at all.
> 
> Kay
> 

Thanks. I used REMOVE_CMD and the script is called. But now I have the problem, that the 
remove event appears, when the device is accessed.

When I plug in, add is called many times (ca. 5). That is no problem, because my script works 
only on the first call. The script creates a desktop icon and starts a daemon, that allows me to
access my device through  a local ftp server. This works without any problem.

But when I try to login to the ftp server, which triggers actual transfer to the usb device, the 
remove event is run and my remove script is called.

I have no idea why. Any Hints?

Juergen


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