Re: PATCH : new key MODEFILE

[Jean Tourrilhes <jt@hpl.hp.com>]

On Sat, Feb 24, 2007 at 03:34:34PM +0100, Kay Sievers wrote:
> On 2/24/07, Jean Tourrilhes <jt@hpl.hp.com> wrote:
> >        I was looking into using the key name RUN and PROGRAM in udev,
> >and I realised that udev attempt to run those programs even if they
> >don't exist. This is a bit wasteful timewise...
> 
> Well, having rules for non-existent programs seems like the "real
> waste", and I call it an configuration error. Care to explain the
> benefit of such rules and extension?
> 
> Thank,
> Kay

	Hi again,

	Sorry for the delay, my wife was keeping me busy over the week
end ;-)
	Thanks for your comments. I think you are only looking at it
from a strict udev perspective, while I'm looking at it from the other
end. I'll try to explain it a bit better...

	Obviously, you never want to put rules for non-existent
programs. However, life is usually messy, and it's difficult to
guarantee that the rules and the program stays in sync over the full
lifetime of a system. I usually clone my HDD and config files between
the various systems I manage. By accident, the user may have the rules
still exist and the program gone or moved.

	Then, I do shell programming, and in shell this type of
conditional construct is quite common. For example, check the
net.agent script in the udev package for the function
check_program(). If it's good practice over there, it's probably good
practice over here.

	But, if it was only for those two reasons, I would agree with
you that it's not a big deal. That's why I designed it so that it's as
generic as possible and can be used for many other things.
	For example, you can do :
------------------------------------------
KERNEL="sdc1", MODEMASK{/mnt/media}="0100", RUN="mount /dev/%k /mnt/media"
------------------------------------------
	You could also do :
------------------------------------------
KERNEL="sdb", MODEMASK{sda}="0001", MODEMASK{sda}="0002", MODE="0666"
------------------------------------------
	If you let your imagination wild, you'll probably find many
other use.

	Have fun...

	Jean

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