[Bug 226931] Deprecating jail(2) and related sysctls

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226931

--- Comment #6 from Jamie Gritton <jamie at FreeBSD.org> ---
(In reply to Bryan Drewery from comment #5)
The idea will be to have "jls -j 0" to report on the current jail (if jailed). 
This would allow any jail parameter to be examined (with some exclusions for
security), instead of just that static list.

The problem I have with the sysctls isn't the situation around reading them,
but that there's a long-standing and incorrect perception that setting them
affects current jails.  I would keep them around read-only, but their very
existence would continue that confusion.

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