Daniel P. Berrange wrote:

Hmm, so your actual filesystem on the host side is read only ?

Yup, mounting a squashfs in RAM.

I'll have to think about how to make it work when the host
FS itself is readonly. Probably have to define some location
that is guarenteed to exist, instead of trying to create a
'/.oldroot' location ourselves.

I suppose so, yes. What is the purpose of .oldroot? When I switch to a rw filesystem, I see that .oldroot gets created, but it is just an empty directory.

Cheers,

-C-