[Bug 253445] bectl: does not function in two-level zfs datasets

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253445

--- Comment #30 from Kyle Evans <kevans@freebsd.org> ---
(In reply to Jonathan Vasquez from comment #28)

Ideally, we would only show the direct descendants of tank/ that have a
mountpoint of none or / (not paying attention to tank at all here). It's a
heuristic that'll generally work, it would filter out tank/home so that we end
up with just tank/os in `bectl list` (and thus, `bectl` will only offer to let
you activate the `os` BE).

This is basically just an anti-footgun. We could set bootfs to tank/home until
the cows come home, but they won't be moo'ing in the morning if we allow that.
Of course, that can be overridden at the loader menu (in theory? I'd be curious
to see if it works with your setup and what it shows in the BE selector), so
it's not a huge deal -- the loader logic wouldn't be touched for any of that.

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