Thank you, unman.

So you copy the directory to dom0 and then use a salt script to copy to
all relevant VMs? Is there any existing solution that doesn't duplicate
data like this? Because in the case of Emacs, it can be a few GB, in the
case of others it could be larger (e.g. pip packages).

While Linux's `overlay` adds a little complexity, I think the core of my
solution is even simpler than SALT: if you want data shared between all
AppVMs, you put it in the TVM. 

The script I shared just automates `overlay` this so that
/etc/underlays/ works similarly to /etc/skel/: Just drop your files in
/etc/underlays/ and add an appropriate entry in
/etc/underlays/underlays.list.

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