[systemd-devel] [PATCH] systemd-udevd.service: restore mount propagation

[Lennart Poettering]

On Tue, 27.01.15 23:20, Martin Pitt (martin.pitt at ubuntu.com) wrote:

> Hey Lennart,
> 
> Lennart Poettering [2015-01-27 22:46 +0100]:
> > So I figure the bit that is missing here is the fact that the .device
> > units for CD drives and USB card readers don't care for media sense right
> > now.
> 
> Indeed, I had a similar thought on my evening walk: This works well
> for USB sticks and the like, but the /dev/sr0 node for CDs always
> stays around after eject. IOW, you get a change event, not a remove
> one. This is also why the cleanup in udisks 1.x (probably) didn't
> actually work.
> 
> > However, I think it would make a ton of sense to change that, and set
> > SYSTEMD_READY=0 on all block devices where the media sensing suggests
> > that no medium is in it. This would mean that these devices don't show
> > up as systemd units until you actually put a medium in it. That would
> > be a change of semantics, but I think a useful one. 
> 
> That sounds good indeed! I can sit down at qemu tomorrow and simulate
> some CD insertions/removals, and come up with an udev rule for this.

That would be great. It would really just be a matter of setting
SYSTEMD_READY=0 for block devices where media sense suggests that no
media is in the drive. Probably a one line fix...

Lennart

-- 
Lennart Poettering, Red Hat