Re: pattern matching in udev

[Ihno Krumreich <ihno@suse.de>]

On Thu, Dec 04, 2003 at 10:51:32AM +0100, Olaf Hering wrote:
>  On Wed, Dec 03, Patrick Mansfield wrote:
> 
> > On Wed, Dec 03, 2003 at 08:19:44PM +0100, Stephane Chauveau wrote:
> > > > > REGEXP "<$bus><$vendor><$id>"="<scsi><ImageMate.*><.*:0:0:\(.*\)>",
> > > > >              NAME="mem\1-%n"
> > > >
> > > > IMO the pattern matching should be part of the TOPOLOGY plus PLACE. 
> > > >
> > > > The scsi naming also requires a parent, your example above is only valid
> > > > if you have one host adapter connected (or one usb mass storage device
> > > > attached), there could exist another sd on *:0:0:0.
> > > 
> > > Not really because my example matches the $bus, the $id and the $vendor.
> > 
> > There could be another identical scsi device with the same id and vendor.
> > 
> > I thought the PCI sysfs id's were constant for a given hardware, but I'm
> > told they can change with PCI hotplug, so the full sysfs path I mentioned
> > previously will not be constant across boots with PCI hotplugging.
> 
> You cant have everything. How do you describe a filesystem to mount:
> Its either the location, then the content may change, or it is the
> content, then the location can change (content in the sense of fs UUID).
> 
> And in the case of pci cards, there is no need for PCI hotplug. Just
> open your PC and move the SCSI card from slot a to slot b. result:
> device node doesnt match if you go for location.

I think the primary goal should be that adding and removing of
devices (or controllers) does not change the name of
the old/remaning devices.
If you open the PC and redistribute the PCI-Cards to the PCI-slots
you can expect that something changed.

Ihno

-- 
Best regards/Mit freundlichen Grüßen

Ihno Krumreich

"Never trust a computer you can lift."
--
Ihno Krumreich            ihno@suse.de
SuSE Linux AG             Projectmanager S390 & zSeries
Deutschherrnstr. 15-19    +49-911-74053-439
90429 Nürnberg            http://www.suse.de


-------------------------------------------------------
This SF.net email is sponsored by OSDN's Audience Survey.
Help shape OSDN's sites and tell us what you think. Take this
five minute survey and you could win a $250 Gift Certificate.
http://www.wrgsurveys.com/2003/osdntech03.php?site=8
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel