How do I make a clean mount namespace?

[Andy Lutomirski]

I want to set up a little container.  So I unshare the mount namespace
and mount something somewhere (say /mnt) that I want to be my new
root.  Now what?

pivot_root("/mnt", "/mnt/garbage") seems to frequently return -EBUSY.

mounting /mnt onto / using MS_MOVE seems to succeed, but / still
points at the old root.

Am I missing a clean way to do this?  I want a way to say "make this
mountpoint be the root of the whole mount namespace and lazy-unmount
everything outside it".  If there is no straightforward way to do
that, can we add one?

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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