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bectl: document the -r flag to bectl

Authored by kevans on Apr 20 2023, 4:57 AM.
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Independent of all of the commands, bectl itself takes an -r flag that
specifies the BE root to use. This was originally added to facilitate
testing, but it was later discovered to be incredibly useful in other
scenarios; e.g., trying to recover some boot environments in rescue

The "BE root" described here is the parent dataset that holds boot
environments, but I've no idea if that's an accepted definition for that

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kevans added a subscriber: gallatin.

Tagging @gallatin as well for the "had to painfully discover this independently" perspective- do you think this is descriptive enough to paint a picture for where one might require it?

This revision is now accepted and ready to land.Apr 20 2023, 5:30 AM

Better UX FTW!


Clearer to EFL speakers, I think.

kevans marked an inline comment as done.

Landed with a typo in the differential revision line