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309 lines
7.9 KiB
Bash
Executable file
309 lines
7.9 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright 2022 Michael J. Karels
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# Copyright 2014 John-Mark Gurney
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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#
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# PROVIDE: growfs
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# REQUIRE: fsck
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# BEFORE: root
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# KEYWORD: firstboot
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# Grow root partition to fill available space, optionally adding a swap
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# partition at the end. This allows us to distribute an image and
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# have it work on essentially any size drive.
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# Note that this uses awk(1), and thus will not work if /usr is on a separate
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# filesystem. We need to run early, because there might be not enough free
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# space on rootfs for the boot to succeed, and on images we ship - which are
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# the primary purpose of this script - there is no separate /usr anyway.
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. /etc/rc.subr
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name="growfs"
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desc="Grow root partition to fill device"
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start_cmd="growfs_start"
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stop_cmd=":"
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rcvar="growfs_enable"
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growfs_get_diskdev()
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{
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local _search=${1}
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sysctl -b kern.geom.conftxt |
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while read x1 _type _dev line
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do
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if [ "${_type}" = "DISK" -a -n "$(echo ${_search} | grep ${_dev})" ]; then
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echo -n ${_dev}
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break
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fi
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done
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}
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# Compute upper bound on swap partition size (if added), based on physmem
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# and vm.swap_maxpages / 2 (the limit that elicits a warning).
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# Rule for swap size based on memory size:
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# up to 4 GB twice memory size
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# 4 GB - 8 GB 8 GB
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# over 8 GB memory size
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growfs_swap_max()
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{
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memsize=$(sysctl -n hw.physmem)
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memsizeMB=$(($memsize / (1024 * 1024)))
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if [ $memsizeMB -lt 4096 ]
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then
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swapmax=$(($memsize * 2))
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elif [ $memsizeMB -lt 8192 ]
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then
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swapmax=$((8192 * 1024 * 1024))
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else
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swapmax=$memsize
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fi
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pagesize=$(sysctl -n hw.pagesize)
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vm_swap_max=$(($(sysctl -n vm.swap_maxpages) / 2 * $pagesize))
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if [ $swapmax -gt $vm_swap_max ]
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then
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swapmax=$vm_swap_max
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fi
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echo -n "$swapmax"
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}
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# Find newly-added swap partition on parent device ($1).
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growfs_last_swap()
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{
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swapdev=$(gpart list $1 | awk '
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$2 == "Name:" { dev = $3 }
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$1 == "type:" && $2 == "freebsd-swap" { swapdev = dev }
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END { print swapdev }
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')
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echo -n $swapdev
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}
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growfs_start()
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{
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verbose=0
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echo "Growing root partition to fill device"
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FSTYPE=$(mount -p | awk '{ if ( $2 == "/") { print $3 }}')
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FSDEV=$(mount -p | awk '{ if ( $2 == "/") { print $1 }}')
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case "$FSTYPE" in
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ufs)
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rootdev=${FSDEV#/dev/}
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;;
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zfs)
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pool=${FSDEV%%/*}
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rootdev=$(zpool list -v $pool | awk 'END { print $1 }')
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;;
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*)
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echo "Don't know how to grow root filesystem type: $FSTYPE"
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return
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esac
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if [ x"$rootdev" = x"${rootdev%/*}" ]; then
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# raw device
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rawdev="$rootdev"
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else
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rawdev=$(glabel status | awk -v rootdev=$rootdev 'index(rootdev, $1) { print $3; }')
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if [ x"$rawdev" = x"" ]; then
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echo "Can't figure out device for: $rootdev"
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return
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fi
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fi
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if [ x"diskid" = x"${rootdev%/*}" ]; then
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search=$rootdev
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else
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search=$rawdev
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fi
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diskdev=$(growfs_get_diskdev ${search})
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if [ -z "${diskdev}" ]; then
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diskdev=${rootdev}
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fi
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# Check kenv for growfs_swap_size; if not present,
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# check $growfs_swap_size from /etc/rc.conf.
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# A value of 0 suppresses swap addition,
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# "" (or unset) specifies the default;
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# other values indicate the size in bytes.
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# If default, check whether swap is already in fstab;
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# if so, don't add another.
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addswap=1
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swapsize="$(kenv -q growfs_swap_size 2>/dev/null)"
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case "$swapsize" in
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"0") addswap=0
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;;
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"") case "$growfs_swap_size" in
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"0") addswap=0
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;;
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"")
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if ! awk '
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/^#/ { next }
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$3 == "swap" { exit 1 }
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' < /etc/fstab
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then
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addswap=0
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fi
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;;
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*) swapsize="$growfs_swap_size"
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;;
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esac
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;;
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*) ;;
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esac
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swaplim=$(growfs_swap_max)
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[ $verbose -eq 1 ] && {
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echo "diskdev is $diskdev"
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echo "search is $search"
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echo "swapsize is $swapsize"
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echo "swaplim is $swaplim"
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}
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sysctl -b kern.geom.conftxt | awk '
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{
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verbose = 0
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lvl=$1
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device[lvl] = $3
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type[lvl] = $2
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idx[lvl] = $7
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offset[lvl] = $9
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parttype[lvl] = $13
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size[lvl] = $4
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if (verbose) print lvl, type[lvl], $3
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if (type[lvl] == "DISK") {
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disksize = size[lvl]
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if (verbose)
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print "disksize ", disksize
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# Do not add swap on disks under 15 GB (decimal) by default.
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if (addswap == 1 && (size[lvl] > 15000000000 || swapsize > 0))
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doing_swap = 1
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else
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doing_swap = 0
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} else if (type[lvl] == "PART" && $11 == "freebsd-swap" && \
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int(swapsize) == 0) {
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# This finds swap only if it precedes root, e.g. preceding disk.
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addswap = 0
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doing_swap = 0
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print "swap device exists, not adding swap"
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}
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if (dev == $3) {
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for (i = 1; i <= lvl; i++) {
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# resize
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if (type[i] == "PART") {
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pdev = device[i - 1]
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if (verbose)
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print i, pdev, addswap, disksize, \
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doing_swap
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swapcmd = ""
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# Allow swap if current root is < 40% of disk.
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if (parttype[i] != "MBR" && doing_swap == 1 && \
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(size[i] / disksize < 0.4 || \
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swapsize > 0)) {
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print "Adding swap partition"
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if (int(swapsize) == 0) {
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swapsize = int(disksize / 10)
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if (swapsize > swaplim)
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swapsize = swaplim
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}
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sector = $5
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swapsize /= sector
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if (verbose)
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print "swapsize sectors",
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swapsize
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align = 4 * 1024 * 1024 / sector
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# Estimate offset for swap; let
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# gpart compute actual start and size.
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# Assume expansion all goes into this
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# partition for MBR case.
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if (parttype[i - 1] == "MBR") {
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if (verbose)
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print "sz ", size[i - 1], \
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" off ", offset[i - 1]
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expand = size[0] - \
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(size[i - 1] + offset[i - 1])
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} else {
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if (verbose)
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print "sz ", size[i], \
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" off ", offset[i]
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expand = size[0] - \
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(size[i] + offset[i])
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}
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if (verbose)
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print "expand ", expand, \
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" sz ", size[i]
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swapbase = (expand + size[i]) / sector
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swapbase -= swapsize + align
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swapcmd = "gpart add -t freebsd-swap -a " align " -b " int(swapbase) " " pdev " && kenv growfs_swap_pdev=" pdev " >/dev/null; "
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if (verbose)
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swapcmd = "set -x; gpart show; " swapcmd
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}
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cmd[i] = swapcmd "gpart resize -i " idx[i] " " pdev
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if (parttype[i] == "GPT")
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cmd[i] = "gpart recover " pdev " ; " cmd[i]
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} else if (type[i] == "LABEL") {
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continue
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} else {
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print "unhandled type: " type[i]
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exit 1
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}
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}
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for (i = 1; i <= lvl; i++) {
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if (cmd[i])
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system(cmd[i])
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}
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exit 0
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}
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}' dev="$search" addswap="$addswap" swapsize="$swapsize" swaplim="$swaplim"
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gpart commit "$diskdev" 2> /dev/null
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case "$FSTYPE" in
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ufs)
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growfs -y /dev/"$rootdev"
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;;
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zfs)
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zpool online -e $pool $rootdev
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;;
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esac
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# Get parent device of swap partition if one was added;
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# if so, find swap device and label it.
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pdev=$(kenv -q growfs_swap_pdev)
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if [ -n "$pdev" ]
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then
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dev=$(growfs_last_swap "$pdev")
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if [ -z "$dev" ]
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then
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echo "Swap partition not found on $pdev"
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exit 0
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fi
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glabel label -v growfs_swap $dev
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fi
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}
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load_rc_config $name
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run_rc_command "$1"
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