Re: can udev SYMLINK{all_partitions} ?

[Kay Sievers <kay.sievers@vrfy.org>]

On Wed, 2004-09-08 at 12:36 -0700, linux-hotplug-devel@digitalride.net
wrote:
> I've been using the NAME{all_partitions} syntax successfully for a usb card reader, but I also need a symlink created for each partition as
> well. For example, I would like both the normal /dev/sda1,/dev/sda2, etc. AND /dev/usb/cf1,/dev/usb/cf2, etc. accessible.  The goal is to
> use udev to maintain all the normal kernel names while creating symlinks to more intuitive spots that may be automounted for other users who
> don't want to mess with /dev/sdX.
> Going out on a limb, I tried the syntax SYMLINK{all_partitions} with several variations (which didn't work) including:
> BUS="scsi", KERNEL="sd*", SYSFS{model}="*HS-CF*" ,SYSFS{vendor}="*IN-WIN*", NAME{all_partitions}="%k", SYMLINK{all_partitions}="usb/cf"
> BUS="scsi", KERNEL="sd*", SYSFS{model}="*HS-CF*" ,SYSFS{vendor}="*IN-WIN*", NAME{all_partitions}="%k", SYMLINK{all_partitions}="usb/cf%n"
> 
> Am I missing an easy way to achieve this,

There is currently no way to do this with the built-in features of udev.
If you don't care about stale symlinks (ones that don't get removed on
device removal) you may create them with a simple CALLOUT shell-script.
It's a bit ugly, but it should work.

Or just consider using any of the volume daemons that poll your device
for media changes. This way you don't need the all_partitions feature at
all.
I'm using HAL for this, which polls all removable devices and have long
forgotten the all_partitions :)

> or is someone already working on a SYMLINK{all_partitions} syntax?

No, it's not easy to reach this. The symlink feature in udev is a very
simple implementation, only one string with all the symlinks separated
by spaces is stored in the udevdb. So there is currently no way to store
how many all_partitions-symlinks need to be removed on the "remove"
event.

Thanks,
Kay



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