This performs all normal filesystem operations. We can take
filesystem hash snapshots on startup, write the contents of an
%ergo to disk, send changes to Urbit with an %into, and finally
delete mount points when they are %ogre.
This doesn't deal with updating an initial filesystem on first
run with -A, or with acquiring a lockfile, which should happen
elsewhere.
Can take filesystem hash snapshots on startup, and can write the
contents of an %ergo to disk.
