Re: Does sysfs really provides persistent hardware path to devices?

[Olaf Hering <olh@suse.de>]

 On Sat, Jan 17, Andrey Borzenkov wrote:

> > > Well, we did not move a tiny bit since the beginning of this thread :)
> > > You still did not show me namedev configuration that implements
> > > persistent name for a device based on its physical location :)))
> >
> > Ok, do you have any other ideas of how to do this?
> >
> 
> given current sysfs implementation - using wildcards remains the only 
> solution. I for now am using this trivial script:
> 
> pts/0}% cat /etc/udev/scripts/removables
> #!/usr/bin/perl
> 
> my $devpath, $base;
> 
> $base = $1 if ($ARGV[0] =~ /(.*\D)\d*$/);
> $devpath = readlink "/sys/block/$base/device";
> 
> if ($devpath =~ 
> m|/devices/pci0000:00/0000:00:1f.4/usb2/2-2/2-2.4/2-2.4:1.0/host\d+/\d+:0:0:0|) 
> {
>         print "flash0";
> } elsif ($devpath =~ 
> m|/devices/pci0000:00/0000:00:1f.4/usb2/2-2/2-2.1/2-2.1:1.0/host\d+/\d+:0:0:0|) 
> {
>         print "flash1";
> } elsif ($devpath =~ m|/devices/legacy/host\d+/\d+:0:4:0|) {
>         print "jaz";
> } else {
>         exit(1);
> }

I'm not sure what you are trying to do. Working with the 'physical
location' of removeable devices will probably fail. The usb-storage
devices here have a serial field, I really hope it is unique, use it.

-- 
USB is for mice, FireWire is for men!

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