udev synchronization problems

["J.C. Wren" <jcwren@jcwren.com>]

    Forgive me if this has been addressed before.  I did some googling 
for answers, but either there are none, or more likely, I am not using 
the correct search terms for useful results.

    I have a script to create compact flash cards for an application.  
It worked well until I switched from devfs to udev.

    The script is pretty basic.  sfdisk, mke2fs, tune2fs, mount, cp, 
umount.  I run into errors where sfdisk completes, then mke2fs complains 
that /dev/hde1 (hde is the PCMCIA CF card) doesn't exist.  Or sometimes 
it gets past that, and tune2fs complains /dev/hde1 doesn't exist.

    As near as I can tell, it's because udevd doesn't react fast enough 
(from my scripts perspective) and present /dev/hde1 once it's been 
created.  So I tried a few things.  I put a loop in the script waiting 
for /dev/hde1 to become present.  Didn't fix it.  Added some 'sleep 1' 
commands.  Didn't fix it.  Tried a while loop that waited for /dev/hde1 
to become present in /proc/partitions.  Didn't fix it.  However, running 
these commands by hand almost always succeed.

    Is there some reliable way to determine that /dev/hde1 is *really* 
there, and ready for action? 

    I've tried 2.6.12-gentoo-r10, 2.6.13 (vanilla), both against udev 
068 and 069. 

    I've been through the udev utilities, didn't see anything that 
looked like it was what I neeed.  Is there a handy command that makes 
sure things are flushed and updated before the next action can take place?

    I'll cheerfully take a solution, or go back to Google if someone can 
tell me what sort of search terms would be relevant.

    Thanks,
       --jc



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