Re: [udev] support arguments in callout exec

[Arnd Bergmann <arnd@arndb.de>]

On Friday 21 November 2003 07:53, Greg KH wrote:
> On Thu, Nov 20, 2003 at 01:47:36AM +0100, Arnd Bergmann wrote:
> > CALLOUT, PROGRAM="sh -c 'echo ${DEVPATH} | tr a-z A-Z'", BUS="usb",
> > ID="XXX", NAME="webcam%n"
>
> Oh come on, why not just make that into a simple script, we're trying to
> keep udev simple :)

Ok, that makes sense.

> > To take that even further, do you think it might be a good idea to
> > preprocess the string in the same way as the NAME= argument, allowing
> > e.g. PROGRAM="/bin/devname %b %M:%m" ?
>
> Hm, good idea.
>
> Someone else also proposed adding a number modifier to the %b field to
> pick out a specific character from a bus id.  Anyone have any thoughts
> about this?  Personally, I think it will be a bit hard to handle bus ids
> that are not fixed widths all the time, but might be handy to try to
> implement a devfs-like udev config file.

When we allow %b in PROGRAM= and find a good way to use the output of
the program as the device name, there won't be any need for such a hack,
as it can better be done in an external script. Getting it right in
udev would be too complicated IMHO (both usage and implementation).

	Arnd <><



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