I was just thinking about all the work that's done to uncompress the 
runnix formatted images, pivot the OS, etc. as well as the symlink-hell 
that we use...  and was revisiting AMD (the automount daemon).

It supports a lot of different filesystem types (including iso, 
loopback, and link/linkx).

We could use the link filesystem to manage maps to unmodified files in 
/stat/ or once they are modified, a tear-away copy could be populated 
into /oldroot/mnt/asturw/... and the link changed on the fly.

The neat thing about this is that install scripts, start-up scripts, 
etc. wouldn't need to know about the linking going on, and we wouldn't 
have to create the symlinks as part of the install nor at start-up from 
/etc/init.d/....

I believe amd also supports unionfs, so we could start out by migrating 
a small number of subsystems and do a rolling conversion, rather than 
throwing a great big switch.

Thoughts?

-Philip


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