Re: udev - that famouse obsolete %e option

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Tuesday 01 August 2006 20:17, VMiklos wrote:
> 2006/8/1, Kay Sievers <kay.sievers@vrfy.org>:
> > How would you manage the numbers to stick with a particular device
> > across reboots and reconfiguration? I can't imagine a "small tool" doing
> > that job. It is entirely device class specific how to to that, and I
> > don't think it can be solved at a generic level.
>
> i'm thinking of cd/dvd symlinks at the moment. an example: i have a
> cdrw+dvd (hdc) drive and a dvdrw drive (sr0). using cdrom_id, it's
> possible to create the following nodes: cdrom-hdc, cdrw-hdc, dvd-hdc,
> (same for sr0) and dvdrw-sr0. then the "tool" would create
> cdrom->cdrom-hdc, cdrom1->cdrom-sr0, ..., dvdrw->dvdrw-sr0 symlinks.
> and yes, across the reboots hdc would _always_ become cdrom, and sr0
> would _always_ become cdrom1
>

Most distributions already have rules that do something similar - it is just 
that having support for this _inside_ of udev core does not make sense.

# udev persistent rules for block subsystem
# Generated by Mandriva udev rules
# See /etc/udev/rules.d/62-create_persistent.rules

SUBSYSTEM="block", ACTION="add", 
ENV{ID_PATH}="pci-0000:00:04.0-scsi-1:0:0:0", SYMLINK+="cdrom cdrom0 dvd 
dvd0", ENV{MDV_CONFIGURED}="yes"
SUBSYSTEM="block", ACTION="add", ENV{ID_PATH}="pci-0000:00:04.0-ide-1:0", 
SYMLINK+="cdrom1 dvd1", ENV{MDV_CONFIGURED}="yes"
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