growfs

#!/bin/sh
#
# Copyright 2014 John-Mark Gurney
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#

# PROVIDE: growfs
# BEFORE: sysctl
# KEYWORD: firstboot

# This allows us to distribute a image
# and have it work on essentially any size drive.
#
# TODO: Figure out where this should really be ordered.
# I suspect it should go just after fsck but before mountcritlocal.
# 

. /etc/rc.subr

name="growfs"
desc="Grow root partition to fill device"
start_cmd="growfs_start"
stop_cmd=":"
rcvar="growfs_enable"

growfs_start ()
{
	echo "Growing root partition to fill device"
	FSTYPE=$(mount -p | awk '{ if ( $2 == "/") { print $3 }}')
	FSDEV=$(mount -p | awk '{ if ( $2 == "/") { print $1 }}')
	case "$FSTYPE" in
	ufs)
		rootdev=${FSDEV#/dev/}
		;;
	zfs)
		pool=${FSDEV%%/*}
		rootdev=$(zpool list -v $pool | tail -n 1 | awk '{ print $1 }')
		;;
	*)
		echo "Don't know how to grow root filesystem type: $FSTYPE"
		return
	esac
	if [ x"$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
	parttype[lvl] = $13
	if (dev == $3) {
		for (i = 1; i <= lvl; i++) {
			# resize
			if (type[i] == "PART") {
				pdev = device[i - 1]
				cmd[i] = "gpart resize -i " idx[i] " " pdev
				if (parttype[i] == "GPT")
					cmd[i] = "gpart recover " pdev " ; " cmd[i]
			} else if (type[i] == "LABEL") {
				continue
			} else {
				print "unhandled type: " type[i]
				exit 1
			}
		}
		for (i = 1; i <= lvl; i++) {
			if (cmd[i])
				system(cmd[i])
		}
		exit 0
	}
}' dev="$rawdev"
	gpart commit "$rootdev"
	case "$FSTYPE" in
	ufs)
		growfs -y /dev/"$rootdev"
		;;
	zfs)
		zpool online -e $pool $rootdev
		;;
	esac
}

load_rc_config $name
run_rc_command "$1"