Date: Sun, 4 May 2014 17:42:37 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: freebsd-rc@FreeBSD.org Subject: growfs rc script... Message-ID: <20140505004237.GP43976@funkthat.com>
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Crochet uses a script to grow the FS so that images can be smaller and
used with different sizes of SD cards...
Crochet hard coded the devices to resize, so I have taken the script
and made it such that it will work on any set of partitions to resize
the root fs...
I think it'd be useful to integrate this into base... Though it
probably does need some tweeks before committing..
Comments?
Thanks.
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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#!/bin/sh
# PROVIDE: growfs
# BEFORE: sysctl
# KEYWORD: firstbootonly
# Automatically grow / to fill the entire disk.
#
# This allows us to distribute a single image
# and have it work on essentially any sized disk.
#
# TODO: Figure out a clean way to have this run
# only on first boot. (We can't write anything to
# disk here since the root disk is still mounted
# read-only at this point.) Fortunately, it completes
# very quickly if it can't actually grow the partition.
#
# TODO: Figure out where this should really be ordered.
# I suspect it should go just after fsck but before mountcritlocal
# but it's hard to tell for sure because of the bug described
# below.
#
. /etc/rc.subr
name="growfs"
start_cmd="growfs_start"
stop_cmd=":"
rcvar="growfs_enable"
growfs_start ()
{
echo "Growing root partition to fill device"
rootdev=$(df / | tail -n 1 | awk '{ sub("/dev/", "", $1); print $1 }')
if [ x"$rootdev" = x"${rootdev%/*}" ]; then
# raw device
rawdev="$rootdev"
else
rawdev=$(glabel status | awk '$1 == "'"$rootdev"'" { print $3 }')
if [ x"$rawdev" = x"" ]; then
echo "Can't figure out device for: $rootdev"
return
fi
fi
sysctl -b kern.geom.conftxt | awk '
{
lvl=$1
device[lvl] = $3
type[lvl] = $2
idx[lvl] = $7
if (dev == $3) {
for (i = 1; i <= lvl; i++) {
# resize
if (type[i] == "PART") {
pdev = device[i - 1]
cmd[i] = "gpart resize -i " idx[i] " " pdev
} else if (type[i] == "LABEL") {
continue
} else {
print "unhandled type: " type[i]
exit 1
}
}
for (i = 1; i <= lvl; i++) {
if (cmd[i])
system(cmd[i])
}
exit 0
}
}' dev="$rawdev"
growfs -y /dev/"$rootdev"
}
load_rc_config $name
run_rc_command "$1"
--pwWdILMQNxDD/Cps--
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