Re: Auto-handling arbitrary USB mass storage devices

[Greg KH <greg@kroah.com>]

On Tue, Sep 21, 2004 at 06:43:23PM -0700, Jason LeBrun wrote:
> I'd like to use udev/hotplug to automate the addition/removal of USB storage 
> devices. I'm not sure of the best way to go about this, since these tools 
> certainly provide more than one way to do it!
> 
> Basically, I'd like to set things up once, and then have this to happen for 
> any plugged usb-storage device:
> 
> 1. When I plug in a device, a device node with a some friendly name, like the 
> results of SYSFS{vendor} should get created in /dev. 

udev can do this for you.

> 2. Mount points should get automatically created somewhere, like in /mnt 
> or /media. They should also have a similarly nice name. 
> 
> 3. A line should be added to fstab that corresponds to the new drive.
> 
> 4. Optionally, the drive should be mounted right away.

HAL does these steps for you.  Not udev.

> It *seems* like hotplug/udev should allow this to be easy, but here are the 
> problems I'm having in each step:
> 
> 1. I can't seem to use all of the SYSFS attributes. For example, 
> SYSFS{product} won't return anything. 

What is the full rule you are trying to match on?

> Furthermore, the %s format specifier is not working quite properly. For 
> example, I have an external USB HD with two partitions. If I use 
> SYMLINK="%s{vendor}%n" in my rules file, I get in my /dev directory the 
> following:
> lrwxrwxrwx   1 root  root         4 Sep 21 18:34 1 -> sda1
> lrwxrwxrwx   1 root  root         4 Sep 21 18:34 2 -> sda2
> lrwxrwxrwx   1 root  root         4 Sep 21 18:34 WDC -> sda1

Please realize that depending on the level in sysfs where your rule
matches, there might not be a vendor file there.  That's what is
probably happening here.

thanks,

greg k-h


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