Re: udev and dbus

[Greg KH <greg@kroah.com>]

On Wed, Mar 10, 2004 at 02:25:27PM -0800, Patrick Mansfield wrote:
> On Wed, Mar 10, 2004 at 11:18:06AM -0800, Greg KH wrote:
> > On Wed, Mar 10, 2004 at 05:31:09PM +0100, David Zeuthen wrote:
> > > 
> > >  1. Remove dbus support from udev and make udev call /sbin/hotplug with
> > >     a single positional parameter, 'udev', and the environment variables
> > >     DEVPATH pointing to the appropriate directory in sysfs, ACTION
> > >     assuming 'add' respectively 'remove' and DEVICE_FILE pointing to
> > >     the created / removed special device file.
> > > 
> > >     This way, applications, like HAL, interested in the event can simply
> > >     install a small program in /etc/hotplug.d/[udev,default] to do
> > >     whatever they want with the event, like sending it to a daemon
> > >     possibly through what may be the IPC-flavour of the month :-)
> > > 
> > >     (yes, this might be abusing the hotplug multiplexor)
> > 
> > Yes, that is abusing the hotplug multiplexor.  I don't like it :)
> 
> I like it. Why does the kernel get to abuse it but not user space ;-)
> 
> Then dbus or anyone can create an agent. And those wanting to
> automatically mount devices, start applications, or setup dm have a nice
> place to put their scripts. In a initrd/initramfs, you could even mount
> and start init based on the root device showing up.
> 
> We should have a simple "your /dev/foo has arrived" interface.

Ok, I have no problem with something like /etc/udev.d/ for when udev is
finished creating or removing a device that works the same way that
/etc/hotplug.d/ does for kernel hotplug events.  I just would not want
to overload the hotplug interface, as that would get quite messy very
quickly :)

Then we could drop a udevdbusd program that would catch all of the udev
messages and send them to the DBUS.  Heh, layers on top of layers...
But it would solve the org.kernel namespace issues for DBUS, right?

Sound reasonable?

thanks,

greg k-h


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