make FAI refuse to wipe out /home iff files exist

[John Heim]

All,

I would like to set up my FAI installation to crash or just stop if and only 
if there are files in /home on the original disk.

Our users all log in with home directories mounted via NFS. But their disk 
quota on the file server is only 6Gb so recently, we've been allowing them 
to save files to the /home directory on the local hard drive. I would like 
to make sure FAI does n't trash that. The problem is that we have not 
traditionally had a separate  /home partition. There was no reason to until 
recently.

I know we could configure FAI to preserve the /home partition if it was a a 
separate partition. Unfortunately, its not.

PS: Yes, I know we shouldn't have let users save files in /home especially 
since it wasn't a separate partition. But that was not my decision.