Udev and initscripts

["Alexander E. Patrakov" <patrakov@ums.usu.ru>]

It has been stated many times that scripts that should run after device 
is available should live in /etc/dev.d directory. However, I have 
trouble following this. The recommendation works perfectly when one has 
to wait for creation of a single device, but it is difficult or 
impossible to implement when waiting for many unknown devices.

The problem is that Linux From Scratch needs an initscript with the 
following properties:

1) it should read a file "/etc/sysconfig/modules" (aka "/etc/modules" in 
Debian). All modules listed there by the user should be modprobed into 
the kernel.

2) The next initscript should be able to assume that all devices it 
needs are already there.

How do I implement (2), i.e., wait for creation of all devices that can 
be created by a user-specified list of modules?

Just doing nothing does not work, as illustrated by the following example:

[root in ~]# modprobe nbd ; ( ls /dev/nbd* | wc -l ) ; sleep 1 ; \
( ls /dev/nbd* | wc -l )
     113
     128

-- 
Alexander E. Patrakov


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