pattern matching in udev

[Stephane Chauveau <s.chauveau@chello.nl>]

Hello,

did anyone considered the idea of using pattern matching in udev.

The current mecanism is nice but it requires an exact match. 

For example, I have a USB dual memory card reader which
produces 2 devices (such as /block/sda and /block/sdb). They
have the same characteristics (model, vendor,...). The only
difference is their bus 'id'  (N:0:0:0 and N:0:0:1 with N a scsi
host number). 

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.

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"

S. Chauveau






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