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netbsd/distrib/utils/embedded/mkimage
2013-04-06 16:48:33 +02:00

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#! /bin/sh
# $NetBSD: mkimage,v 1.3 2012/02/29 04:49:50 agc Exp $
# Copyright (c) 2012 Alistair Crooks <agc@NetBSD.org>
# 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 ``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 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.
#
# find next available vnd, from kre
next_avail ()
{
local dev="$1"
local N=$(( ${#dev} + 1 ))
local unit units
units=$(
sysctl -n hw.disknames |
tr ' ' '\012' |
grep '^'"${dev}"'[0-9]' |
sort -n -k 1.$N )
test -z "${units}" && {
test -e "/dev/${dev}0a" || {
echo >&2 "No ${dev}s available!"
return 1
}
echo "${dev}0"
return
}
N=0
for unit in ${units}
do
if [ "${unit}" = "${dev}${N}" ]
then
N=$(( N + 1 ))
else
echo "${dev}${N}"
return
fi
done
test -e /dev/"${dev}${N}a" || {
echo >&2 "All ${dev}s in use"
return 1
}
echo "${dev}${N}"
}
# find the size of the gzipped files in a .tgz archive
sizeone() {
case "$1" in
*.tgz|*.tar.gz)
tar tvzf "$1" | awk '{ tot += $5 } END { print tot }'
;;
*.tbz|*.tar.bz2)
tar tvjf "$1" | awk '{ tot += $5 } END { print tot }'
;;
*)
echo 0
;;
esac
}
bar="==="
custom=custom
h=usermode1.$(uname -n)
image=usermode.img
overhead=8 # in MB
sets="base etc modules"
setsdir=/usr/build/release/$(uname -m)/binary/sets
size=0 # in MB
specialdirs="/kern /proc"
usermodedirs="/var.cow /etc.cow /root.cow /pkgs"
sudo="sudo"
while [ $# -gt 0 ]; do
case "$1" in
-S) setsdir=$2; shift ;;
-c) custom=$2; shift ;;
-h) h=$2; shift ;;
-s) size=$2; shift ;;
-x) set -x ;;
*) break ;;
esac
shift
done
if [ $# -gt 0 ]; then
# take the next argument as being the image name
image="$1"
shift
fi
total=0
for s in ${sets}; do
total=$(expr ${total} + $(sizeone ${setsdir}/${s}.tgz))
done
# calculate size of custom files
custsize=0
if [ -d "${custom}" ]; then
custsize=$(ls -lR "${custom}" | awk 'NF == 9 { tot += $5 } END { print tot }')
fi
total=$(expr \( \( ${total} + ${custsize} \) / 1000000 \) + ${overhead})
if [ $size -eq 0 ]; then
# auto-size the pkgs fs
size=${total}
else
# check that we've been given enough space
if [ ${total} -gt ${size} ]; then
echo "File system size given as ${size} MB, but it needs ${total} MB" >&2
exit 1
fi
fi
echo "${bar} making a new ${size} MB image in ${image} ${bar}"
dd if=/dev/zero of=${image} bs=1m count=${size}
vnddev=$(next_avail vnd)
echo "${bar} mounting image via vnd ${vnddev} ${bar}"
${sudo} vnconfig ${vnddev} ${image}
${sudo} newfs /dev/r${vnddev}a
${sudo} mount /dev/${vnddev}a /mnt
echo "${bar} installing sets ${bar}"
(cd /mnt &&
for s in ${sets}; do
echo ${s}
${sudo} tar xpzf ${setsdir}/${s}.tgz
done
)
echo "${bar} performing customisations ${bar}"
${sudo} rm -f /mnt/etc/motd
tmp=/tmp/usermode.$$
cat > ${tmp} << EOF
# NetBSD/usermode /etc/fstab
/dev/ld0a / ffs ro 1 1
/dev/ld1a /pkgs ffs ro 1 2
kernfs /kern kernfs rw
ptyfs /dev/pts ptyfs rw
procfs /proc procfs rw
# mount /root as tmpfs on top of existing dir
tmpfs /root.cow tmpfs rw,-s2M 0 0
/root.cow /root union rw,hidden 0 0
# mount /etc as tmpfs on top of existing dir
tmpfs /etc.cow tmpfs rw,-s12M 0 0
/etc.cow /etc union rw,hidden 0 0
# mount /var as tmpfs on top of existing dir
tmpfs /var.cow tmpfs rw,-s32M 0 0
/var.cow /var union rw,hidden - -
tmpfs /tmp tmpfs rw,-s32M 0 0
/dev/cd0a /cdrom cd9660 ro,noauto
EOF
${sudo} mv ${tmp} /mnt/etc/fstab
cat > ${tmp} << EOF
# $NetBSD: mkimage,v 1.3 2012/02/29 04:49:50 agc Exp $
#
# see rc.conf(5) for more information.
#
# Use program=YES to enable program, NO to disable it. program_flags are
# passed to the program on the command line.
#
# Load the defaults in from /etc/defaults/rc.conf (if it's readable).
# These can be overridden below.
#
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
fi
# If this is not set to YES, the system will drop into single-user mode.
#
rc_configured=YES
# make sure we have the right rw filesystem at boot
critical_filesystems_local="/var.cow /var /etc.cow /etc /root.cow /root"
# Add local overrides below
#
dhcpcd=YES
sshd=YES
hostname=${h}
EOF
${sudo} mv ${tmp} /mnt/etc/rc.conf
echo "${bar} making extra directories ${bar}"
for d in ${usermodedirs}; do
${sudo} mkdir -p /mnt/${d}
done
for d in ${specialdirs}; do
${sudo} mkdir -p /mnt/${d}
done
echo "${bar} customising /var/tmp ${bar}"
${sudo} rm -rf /mnt/var/tmp
(cd /mnt/var && ${sudo} ln -s /tmp tmp)
# package-related stuff
(cat /mnt/etc/csh.cshrc;echo "setenv PKG_DBDIR /usr/pkg/.dbdir") > ${tmp}
${sudo} mv ${tmp} /mnt/etc/csh.cshrc
(cat /mnt/etc/profile;echo "export PKG_DBDIR=/usr/pkg/.dbdir") > ${tmp}
${sudo} mv ${tmp} /mnt/etc/profile
(echo "PKG_DBDIR=/usr/pkg/.dbdir") > ${tmp}
${sudo} mv ${tmp} /mnt/etc/mk.conf
(cd /mnt/usr && ${sudo} ln -s /pkgs/usr/pkg pkg)
# last, customisation stage
if [ -d ${custom} ]; then
echo "${bar} user customisations from files in ${custom} ${bar}"
(cd ${custom} && ${sudo} pax -rwpe . /mnt)
fi
df /mnt
${sudo} umount /mnt
${sudo} vnconfig -u ${vnddev}
exit 0