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|
#!/bin/bash -e
#
# mkus-iso - add Sugar and activities to Ubuntu installation media
#
# input: ubuntu-14.04.2-desktop-amd64.iso
#
# output: olpc-ubuntu-sugar-14.04.2-desktop-amd64.iso
#
# Based on oem-config-remaster, this script adds the Sugar desktop and
# activities to the live filesystem on the installation media, by
# reading the filesystem, using APT to install packages, and then
# writing a new filesystem.
#
# Ubuntu installation media is described in the ubiquity source
# package. The media is an ISOHYBRID MBR ISO9660 filesystem which
# contains a file with a squashfs live filesystem. The former is
# created by ubiquity using xorriso. The latter is created by
# ubiquity-casper using mksquashfs.
#
#
# Naming convention for mount point directories
#
# cd_* the outer iso9660 bootable filesystem
# fs_* the inner squashfs live filesystem made by ubiquity-casper
#
# {cd,fs}_ro the unchanged original
# {cd,fs}_rw a backing filesystem (writes to the aufs are made here)
# {cd,fs} an aufs filesystem to which we will make changes
#
# check for missing dependencies
MISSING=0
for program in xorriso mksquashfs; do
if ! which $program >/dev/null; then
if [ $MISSING == 0 ]; then
echo "$(basename $0): please install the dependencies below and retry"
fi
echo "$(basename $0): missing $program"
MISSING=1
fi
done
if [ $MISSING == 1 ]; then
exit 1
fi
# installation media from upstream project
INPUT=ubuntu-14.04.2-desktop-amd64.iso
# directory to work in
TEMPDIR=/tmp/us
# output media
OUTPUT=olpc-ubuntu-sugar-14.04.2-desktop-amd64-$(date +%s).iso
if [ -f ~/.mkus-iso.conf ]; then
. ~/.mkus-iso.conf
fi
# process options and arguments
while [ ! -z "$1" ]; do
case "$1" in
--output)
shift
OUTPUT=$1
shift
;;
--tmpdir)
shift
TMPDIR=$1
shift
;;
*)
INPUT=$1
shift
;;
esac
done
# check for missing input file
if [ ! -r $INPUT ]; then
echo "$(basename $0): input installation media image not found"
exit 1
fi
# canonicalise file paths
INPUT=$(readlink -f $INPUT)
OUTPUT=$(readlink -f $OUTPUT)
# create temporary directory
mkdir -p $TEMPDIR
cd $TEMPDIR
# warning: make no further persistent changes to current working directory
# functions
mount_kernelfs()
{
mount -t sysfs sysfs fs/sys
mount -t proc proc fs/proc
mount -t devtmpfs devfs fs/dev
mount -t devpts devpts fs/dev/pts
}
umount_kernelfs()
{
umount fs/dev/pts
umount fs/dev
umount fs/proc
umount fs/sys
}
disable_forks()
{
# https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/430224
# http://blogs.balabit.com/2011/01/21/using-upstart-in-a-chroot/
mv fs/sbin/initctl fs/sbin/initctl.REAL
ln -s /bin/true fs/sbin/initctl
mv fs/sbin/start-stop-daemon fs/sbin/start-stop-daemon.REAL
cat >fs/sbin/start-stop-daemon<<EOF
#!/bin/sh
echo
echo "Warning: fake start-stop-daemon called, doing nothing"
echo "\$*"
echo
EOF
chmod 755 fs/sbin/start-stop-daemon
}
enable_forks()
{
mv fs/sbin/start-stop-daemon.REAL fs/sbin/start-stop-daemon
rm fs/sbin/initctl
mv fs/sbin/initctl.REAL fs/sbin/initctl
}
cleanup() {
set +e
[ -d fs/proc/1 ] && umount_kernelfs
for directory in fs fs_rw fs_ro cd cd_rw cd_ro; do
if [ -e "$directory" ]; then
umount $directory
rmdir $directory
fi
done
}
trap cleanup EXIT HUP INT QUIT TERM
# mount the installation media
mkdir -p cd_ro
mount -o loop,ro $INPUT cd_ro
# set up a copy-on-write filesystem for new installation media
mkdir -p cd_rw
mount -t tmpfs tmpfs cd_rw
mkdir -p cd
mount -t aufs -o br=cd_rw:cd_ro none cd
# mount the live filesystem
mkdir -p fs_ro
mount -o loop,ro cd_ro/casper/filesystem.squashfs fs_ro
# set up a copy-on-write filesystem for the live filesystem
mkdir -p fs_rw
mount -t tmpfs tmpfs fs_rw
mkdir -p fs
mount -t aufs -o br=fs_rw:fs_ro none fs
# save the sources list
cp fs/etc/apt/sources.list .
# change the sources list to local proxy and add our public archive
cat > fs/etc/apt/sources.list <<EOF
deb http://us.archive.ubuntu.com/ubuntu/ trusty main universe multiverse restricted
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main universe multiverse restricted
deb http://security.ubuntu.com/ubuntu/ trusty-security main universe multiverse restricted
deb [trusted=yes] http://dev.laptop.org/pub/us trusty main
EOF
# duplicate local cache of archive metadata to save time
cp -pr /var/lib/apt/lists fs/var/lib/apt/
# ensure name resolver can work
# (is overwritten by resolvconf on installer boot)
cp /etc/resolv.conf fs/etc/
# update package list and install packages
mount_kernelfs
disable_forks
chroot fs ln -s /proc/mounts /etc/mtab
chroot fs apt-get update
chroot fs apt-get --assume-yes install olpc-activities \
virtualbox-guest-utils \
olpc-powerd- git- fakeroot- consolekit-
enable_forks
umount_kernelfs
# restore sources.list and add our public archive
cp sources.list fs/etc/apt/
echo 'deb [trusted=yes] http://dev.laptop.org/pub/us trusty main' >> \
fs/etc/apt/sources.list
rm sources.list
# FIXME: is not effective, ubiquity removes it,
# try to use d-i oem-config/repository from oem-config-remaster
# FIXME: answer some bootloader and installer questions ahead of time
# path to files associated with this script
#PF=$(dirname $0)
#cp $PF/ks.preseed cd/
#cp $PF/ks.cfg cd/
#cp $PF/boot/grub/grub.cfg cd/boot/grub/
#cp $PF/isolinux/txt.cfg cd/isolinux/
# regenerate squashfs
( chroot fs dpkg-query -W ) > cd/casper/filesystem.manifest
rm cd/casper/filesystem.squashfs
mksquashfs fs cd/casper/filesystem.squashfs
# build image
# derived from https://bugs.launchpad.net/ubuntu-cdimage/+bug/1298894/comments/17
xorriso -as mkisofs -r -checksum_algorithm_iso md5,sha1 -V Ubuntu\ 14.04.2\ LTS\ amd64 -o $OUTPUT -isohybrid-mbr /usr/lib/syslinux/isohdpfx.bin -cache-inodes -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot -isohybrid-gpt-basdat -isohybrid-apm-hfsplus cd
cleanup
|
