Bug#678696: Event based block device handling (fixes USB and nested devices problem)

[Goswin von Brederlow <goswin-v-b@web.de>]

On Wed, Mar 04, 2015 at 09:30:24PM +0000, Ben Hutchings wrote:
> Thanks for your work on this bug.  I ended up with a somewhat different
> implementation as I don't think it's necessary to duplicate the
> information that udev provides, and as we may now need to mount more
> than one filesystem.  But I should have credited you in the changelog
> for prototyping this, and I forgot to do so.
> 
> Ben.

The idea with the udev rule was to wait up to ROOTDELAY seconds
without a new device apearing before giving up. Now you wait ROOTDELAY
seconds in total, which then can depend on the number of devices. Add
a new disk and you have to increase the ROOTDELAY.

Also it was ment so that block scripts could specifically target the
new devices instead of having to scan all devices every time. For
example say you have a crypt device and you forgot the password. Now I
think you will be asked 30 times for the password before the initramfs
gives up.

MfG
	Goswin