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rc.initdiskless: add support for auxiliary NVRAM.

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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
MFC after:	1 month
This commit is contained in:
Eugene Grosbein 2018-10-20 18:13:51 +00:00
parent a2a90d6ee5
commit b4d24263c2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339465
1 changed files with 20 additions and 2 deletions
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22
libexec/rc/rc.initdiskless
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@ -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.
@ -343,8 +352,8 @@ 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/
@ -367,6 +376,15 @@ for i in ${templates} ; do
(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/$i/*.remove ; do
subdir=${j%*.remove}
subdir=${subdir##*/}