- install to $j/base
- create $j/etc $j/var $j/home $j/tmp $j/usrlocal etc
- null-ro mount $j/base to $j/root
- null-rw mount $j/etc to $j/root/etc
- null-rw mount $j/var to $j/root/var
- etc...
- when upgrade time, diff $j/etc against $j/base/etc to see what was edited and how
- upgrade $j/base
- copy $j/base to $j/etc and apply the patches for changed items
- things like var can be updated by running the var mtree over it
- things like home and stuff don't need to be upgraded
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