Re: Device enumeration (was Re: CD writing in future Linux (stirring up a hornets' nest))

[Rob Landley <rob@landley.net>]

On Tuesday 14 February 2006 6:47 pm, Greg KH wrote:
> On Tue, Feb 14, 2006 at 05:32:22PM -0500, Rob Landley wrote:
> > Changes to the kernel have already managed to break us twice
> > (switching /sys/class from real subdirectories to symlinks means we can't
> > just ignore symlinks when recursing down through directories anymore,
> > which is a problem because the existing symlinks form loops.
>
> I've shown a simple way to handle this, so this should not be a problem
> anymore.

Yup.  We're ok with the current stuff, thanks.

(I haven't updated the mdev code yet because I need to build a 2.6.16-pre 
kernel with the new layout to test against, but I've got a couple options 
worked out.)

> > And deprecating /sbin/hotplug means we've got to bloat the code with
> > netlink stuff.)  But we'll cope, and the user interface isn't
> > changing.
>
> Since when is /sbin/hotplug "depreciated"?

http://lwn.net/Articles/166377/

  The hotplug helper /sbin/hotplug is now officially deprecated. The control
  file /proc/sys/kernel/hotplug has moved to /sys/kernel/uevent_helper, but it
  is expected to be disabled on most systems in favor of udev and the netlink
  interface.   

> It still works just fine, and isn't going anywhere anytime soon.

Good news for fans of small and simple, then. :)

> Turns out that some distros just don't want to use it, and use netlink
> instead.  That should not stop you from using it if you wish, as the
> kernel sure doesn't care one way or the other.

Cool.  For busybox, /sbin/hotplug is "the easy way".

> thanks,
>
> greg k-h

Rob
-- 
Never bet against the cheap plastic solution.