[Bug 204215] [patch] [feature-request] make rc.initdiskless more embedded-friendly and support auxiliary NVRAM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204215

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: eugen
Date: Mon Nov 19 06:37:39 UTC 2018
New revision: 340611
URL: https://svnweb.freebsd.org/changeset/base/340611

Log:
  MFC r339465: rc.initdiskless: add support for auxiliary NVRAM.

    Currently, rc.inidiskless assumes that local system configuration
    changes are kept in some mountable file system. For example,
    nanobsd uses dedicated partition mounted as /cfg for this.

    However, small embedded devices like MIPS routers may have no enough flash
    space to keep full-blown file system but have only one or couple
    small flash blocks to keep persistent local configuration overrides.

    This change extends rc.initdiskless and introduces ability to run auxiliary
    command /conf/T/M/extract that is supposed to extract configuration
overrides
    from such local storage.

    For example, the command /conf/default/etc/extract may contain something
like:

    cd "$1" && bsdcpio --quiet -idu < /dev/map/cfg

    bsdcpio command extracts compressed archive from the storage to /etc
    assuming the storage is exposed by the kernel as /dev/map/cfg to userland.

  PR:           204215

Changes:
_U  stable/11/
  stable/11/etc/rc.initdiskless

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