Re: pattern matching in udev

[Patrick Mansfield <patmans@us.ibm.com>]

On Sat, Nov 29, 2003 at 09:58:20PM +0100, Stephane Chauveau wrote:

> LABEL is useless because the 'keys' are identical and TOPOLOGY
> is also not what I want because the scsi host are not constant.
> 
> The current solution is to use CALLOUT but a better way to do it
> would be to add some simple pattern matching capabilities to udev.

Yes, that sounds like a good idea.

> For example using the usual * and ? :
>  
> LABEL, BUS="scsi", vendor="ImageMate CF-SM ", ID="*:0:0:0" ,  NAME="mem0-%n"
> LABEL, BUS="scsi", vendor="ImageMate CF-SM ", ID="*:0:0:1" ,  NAME="mem1-%n"

> Or even better using regular expressions that could be reused to build
> the final name:
> 
> 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.

The matching should be capable of including the parent path, or more
easily but uglier, the whole sysfs path. 

For example:

Two usb mass storage at LUN 0 and LUN1:

/sysfs/devices/pci0000:00/0000:00:07.2/usb1/1-1/1-1:1.0/host0/0:0:0:0
/sysfs/devices/pci0000:00/0000:00:07.2/usb1/1-1/1-1:1.0/host0/0:0:0:1

And a system with a scsi host adapter with a single device at LUN 0:

/sysfs/devices/pci0000:01/0000:01:0c.0/host1/1:0:0:0

Could be named via:

TOPOLOGY, BUS="usb", place="pci0000:00/0000:00:07.2/usb1/1-1/1-1:1.0/*/*:0:0:0", NAME="mem0-%n"

TOPOLOGY, BUS="usb", place="pci0000:00/0000:00:07.2/usb1/1-1/1-1:1.0/*/*:0:0:1", NAME="mem1-%n"

TOPOLOGY, BUS="usb", place="pci0000:01/0000:01:0c.0/*/*:0:0:0" NAME="disk1%n"

-- Patrick Mansfield


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