unionfs is not supported at this time.  It is purely experimental.
There are some halt.sh script changes that need to be put inplace for it
to work at shutdown.

Also unionfs at the moment does not support remounting ro or rw.  It
will fail.  

I am not even 100% sure that this is how unionfs should be implemented
in the future.  It is highly experimental and there are bugs with it
yet.  In the future it may not be part of the initramfs at all as it
contains issues such as you are describing.  

Mainly its inclusion to date is proof of concept only and may be
radically different in the future.

Rocket.


On 22:49 Thu 28 Jul     , Rafael Esp?ndola wrote:
> I am trying to build a system that uses a unionfs as root. The init
> script is based on the one used by gentoo and uses initramfs. The
> problem is how to remount the unionfs constituents read only during
> halt.
> 
> cat /proc/mounts displays /dev/hda1 (ext2) mounted rw in /memory. The
> problem is that /memory is no longer visible after the init script did
> a chroot and a
> 
> mount -o remount,ro /dev/hda1
> 
> says that /dev/hda1 is not mounted!
> 
> does any anyone has an idea?
> 
> Thanks,
> Rafael
> 
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