[nanobsd] When exactly is /cfg copied over /etc?

Greetings. I'm looking to find the piece of code that is mounting /cfg and copying its contents over /etc during nanobsd image boot. The reason for this is to create a SVN repo on /cfg (using svnlite(1)) and keep modified configuration files there, hence some sort of svnlite checkout should be executed upon boot, instead of simple cp(1) (or equivalent). Tried to locate what script does the magic, but could not. Any hints? Thank you for your time!

PS: Even if this svnlite(1) thingie doesn't work I'm curious to see why I couldn't find which script restores configuration.
 
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