[Bug 279116] sysutils/s6-rc update to 0.5.4.2

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279116

--- Comment #3 from crest@rlwinm.de ---
Afaik only FreeBSD tracks the login class in the kernel via setloginclass(2).
Sadly the FreeBSD base system lacks a chain-loadable command that just calls
setloginclass(2) and execs into its remaining arguments.

Every command that's available to shell (or execline) scripts (e.g. su) doesn't
exec(), but fork()+exec() which is a problem for reliable process supervision
without using operating system specific APIs (e.g. sub-reapers).

Do you want to have the inner nodes of the supervision tree (s6-svscan,
s6-supervise) modify their login class or only the run/finish/check/up/down
scripts? In the latter case adding the "missing chain-loader" as its own tiny
should solve the problem and avoid the hassle of maintaining a FreeBSD specific
feature patch even if it's small.

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