Date: Mon, 19 Nov 2018 06:39:00 +0000 (UTC) From: Eugene Grosbein <eugen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r340612 - stable/10/etc Message-ID: <201811190639.wAJ6d0pT026524@repo.freebsd.org>
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Author: eugen Date: Mon Nov 19 06:39:00 2018 New Revision: 340612 URL: https://svnweb.freebsd.org/changeset/base/340612 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 Modified: stable/10/etc/rc.initdiskless Modified: stable/10/etc/rc.initdiskless ============================================================================== --- stable/10/etc/rc.initdiskless Mon Nov 19 06:37:38 2018 (r340611) +++ stable/10/etc/rc.initdiskless Mon Nov 19 06:39:00 2018 (r340612) @@ -111,6 +111,15 @@ # created for /SUBDIR if necessary). The presence of this file # prevents the copy from /conf/T/SUBDIR/ # +# /conf/T/M/extract +# This is alternative to SUBDIR.cpio.gz and remount. +# Similar to remount case, a memory filesystem is created +# for /M and initialized from a template but no mounting +# performed. Instead, this file is run passing /M as singe +# argument. It is expected to extract template override to /M +# using auxiliary storage found in some embedded systems +# having NVRAM too small to hold mountable file system. +# # /conf/T/SUBDIR.remove # The list of paths contained in the file are rm -rf'd # relative to /SUBDIR. @@ -342,8 +351,8 @@ done # - Create all required MFS filesystems and populate them from # our templates. Support both a direct template and a dir.cpio.gz -# archive. Support dir.remove files containing a list of relative -# paths to remove. +# archive. Support for auxiliary NVRAM. Support dir.remove files containing +# a list of relative paths to remove. # # The dir.cpio.gz form is there to make the copy process more efficient, # so if the cpio archive is present, it prevents the files from dir/ @@ -364,6 +373,15 @@ for i in ${templates} ; do create_md $subdir echo "Loading /$subdir from cpio archive $j" (cd / ; /rescue/tar -xpf $j) + fi + done + for j in /conf/$i/*/extract ; do + if [ -x $j ]; then + subdir=${j%*/extract} + subdir=${subdir##*/} + create_md $subdir + echo "Loading /$subdir using auxiliary command $j" + $j /$subdir fi done for j in /conf/$i/*.remove ; do
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