[Pkg-lirc-maint] Bug#676343: Bug#676343: lirc: /var/run/lirc contents disappear due to subtle udev interaction

[Stefan Lippers-Hollmann]

Hi

On Wednesday 06 June 2012, Matthijs Kooijman wrote:
> Hi Stefan,
> 
> > I'm pretty sure this is due to a missing LSB dependency on $local_fs 
> > for lirc's init script.
> I'm not so sure this is really the case: The problem is really that the
> udev rule triggers a lirc (re)start too soon on the boot sequence, not
> that the normal init script invocation is too soon. 
> 
> This would mean that any dependency changes in the init script would not
> fix this problem.

In my experience, with several USB/ hotpluggable lirc devices and a 
separate /var/ partition, this is the actual problem. What happens is 
that the lircd socket gets created underneath the final /var/run/, 
/run/ respectively, before it is mounted on its final place, thereby 
getting hidden and inaccessible from the clients. On a regular 
installed the most common cause for this is mounting /var/ on a 
dedicated partition, I assume something similar is the case on 
Debian-live with its writeable overlay filesystem(s).
I am considering to force /run/ for wheezy, instead of /var/run/ and
relying on on initscript's transitioning magic though, as this would
make the socket handling a bit more robust, but the actual upgrade a
little more complex than before; due to the symlinks there are no
consequences for userspace ABIs.

> > 	update-rc.d -f lirc remove
> > 	update-rc.d lirc defaults 19
> I just tried these, but this did not cause any reordering in the
> scripts. I didn't try booting the system again (I'd have to generate a
> new image first), but I have the entire rootfs under version control so
> I'm sure nothing changed as a result of the above commands.
[…]

If you're trying it on Debian live systems, you better inject a fixed 
package[1] into the ISO build - but I'm not familiar with Debian-live 
specifics.

Regards
	Stefan Lippers-Hollmann

[1]	by applying this patch 
	http://lists.alioth.debian.org/pipermail/pkg-lirc-changes/2011-May/000568.html
	to 0.9.0~pre1-1. Tell me, if you need help with creating 
	those test packages
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