mkimage.sh

#!/bin/sh

########################################################################
# rpi2-build-image
# Copyright (C) 2015 Ryan Finnie <ryan@finnie.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
########################################################################

# This is a stub from rpi-build-image.sh. Useful for rebuilding the image after making minor changes that don't 
# require the entire chroot be rebuilt

set -e
set -x

RELEASE=utopic
BASEDIR=/srv/rpi2/${RELEASE}
BUILDDIR=${BASEDIR}/build
SHELL=/bin/bash

# Set up environment
export TZ=UTC
R=${BUILDDIR}/chroot

# Unmount mounted filesystems
umount $R/proc || true
umount $R/sys || true

# Clean up files
rm -f $R/etc/apt/sources.list.save
rm -f $R/etc/resolvconf/resolv.conf.d/original
rm -rf $R/run
mkdir -p $R/run
rm -f $R/etc/*-
rm -f $R/root/.bash_history
rm -rf $R/tmp/*
rm -f $R/var/lib/urandom/random-seed
[ -L $R/var/lib/dbus/machine-id ] || rm -f $R/var/lib/dbus/machine-id
rm -f $R/etc/machine-id
rm -f $R/usr/bin/qemu-arm-static
rm -f $R/etc/ssh/ssh_host_*
rm -fr $R/usr/sbin/policy-rc.d

# Build the image file
# Currently hardcoded to a 1.75GiB image
DATE="$(date +%Y-%m-%d)"
dd if=/dev/zero of="$BASEDIR/${DATE}-ubuntu-${RELEASE}.img" bs=1M count=1
dd if=/dev/zero of="$BASEDIR/${DATE}-ubuntu-${RELEASE}.img" bs=1M count=0 seek=1792
sfdisk -f "$BASEDIR/${DATE}-ubuntu-${RELEASE}.img" <<EOM
unit: sectors

1 : start=     2048, size=   131072, Id= c, bootable
2 : start=   133120, size=  3536896, Id=83
3 : start=        0, size=        0, Id= 0
4 : start=        0, size=        0, Id= 0
EOM
VFAT_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-ubuntu-${RELEASE}.img)"
EXT4_LOOP="$(losetup -o 65M --sizelimit 1727M -f --show $BASEDIR/${DATE}-ubuntu-${RELEASE}.img)"
mkfs.vfat "$VFAT_LOOP"
mkfs.ext4 "$EXT4_LOOP"
MOUNTDIR="$BUILDDIR/mount"
mkdir -p "$MOUNTDIR"
mount "$EXT4_LOOP" "$MOUNTDIR"
mkdir -p "$MOUNTDIR/boot/firmware"
mount "$VFAT_LOOP" "$MOUNTDIR/boot/firmware"
rsync -a "$R/" "$MOUNTDIR/"
umount "$MOUNTDIR/boot/firmware"
umount "$MOUNTDIR"
losetup -d "$EXT4_LOOP"
losetup -d "$VFAT_LOOP"
bmaptool create -o "$BASEDIR/${DATE}-ubuntu-${RELEASE}.bmap" "$BASEDIR/${DATE}-ubuntu-${RELEASE}.img"