[coLinux-users] unionfs in colinux?

[David K. <da...@gi...>]

Hi,

I'd like to use unionfs in colinux:
http://www.fsl.cs.sunysb.edu/project-unionfs.html

My goal is to have several colinux instances sharing a large read-only 
filesystem (like the OS images that ship with colinux) and saving their 
local changes to smaller writable local "unioned" filesystems.  This would 
help me to repeatedly test-install large, complicated software packages 
that we develop (such as http://krang.sf.net), with the ability to quickly 
roll back the O/S to its pristine state and re-do as many times as needed, 
and also to make it easy to identify and isolate all changes made to the 
underlying distro afterwards (by examining the writable directory mounted).

I read that unionfs was "baked in" to the linux kernel since 2.6.14 and 
also see that it is supported by my distro (debian etch) so I was 
disappointed when:

  mount -t unionfs -o dirs=/Fruits:/Vegetables none /mnt/healthy

complained that:

  unknown file system unionfs

Is unionfs not baked into the colinux kernel, too?  Am I doing something 
wrong (or not doing something else right?)  Do I need to get the source, 
compile and load the kernel module for colinux?  I've never done that 
before, but for this I'd be anxious to give it a try!

I'm running a recent 0.8.0 snapshot (at the moment) but would be willing to 
up-, down-, or side-grade to get unionfs running!

Thanks!

-dave