[clue-tech] Detecting media change

[David L. Willson]

Overkill for what I need.

I just need to "look" at a given filesystem from a script, and determine whether I own
it, and whether it's the one I used yesterday.  If I own it AND it's the one I used
yesterday, I'll just do my normal thing.  If I don't own it, I'll scream and holler.  If
I own it AND it's NOT the one I used yesterday, I'll blank it and then do my normal thing.

I think I just wrote the script I need, minus translation into bash-ese.

On Thu, 01 May 2008 18:28:37 +0000, dennisjperkins wrote
> I'm not sure how to do it, but I might be able to point you towards what you need.
> 
> If you are using udev, and most distros do nowadays, you might be able to 
> monitor the device in /sysfs.  You might be able to use /proc instead, but 
> /proc is deprecated for most hardware info.
> 
> If you are using HAL and dbus, you might be able to register a request with 
> the dbus server to be informed whenever the media is changed.  I'm assuming 
> that HAL can trigger such a message.
> 
> I don't know if you could monitor /dev for the existence of the driver  This 
> does require udev.  Does the driver disappear when the media is removed?
> 
>  -------------- Original message ----------------------
> From: "David L. Willson" <DLWillson at TheGeek.NU>
> > Anyone have a "best" way to detect the successful swap of a USB disc (or new 
> > blank
> > optical media)?
> > 
> > I want my backup program to automatically detect the attachment of new media, 
> > validate a
> > few things, and then blank that media.  Hmmm...  I was thinking of doing 
> > something fancy
> > like reading the UUID off the filesystem and keeping track of that locally, but 
> > I guess
> > I could do something simpler, like recording a "last-used" bookmark on the 
> > currently
> > attached disc, and deciding what to do with the currently attached media based 
> > on
> > whether that bookmark is present and what it's mod-date is.
> > 
> > Hmmm...  Thoughts?
> > 
> > David L. Willson
> > Trainer/Engineer/Consultant
> > MCT, MCSE, Linux+
> > (720) 333-LANS
> > 
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> 
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David L. Willson
Trainer/Engineer/Consultant
MCT, MCSE, Linux+
(720) 333-LANS