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#!/bin/bash

set -e
set -u

dpkg -l ufsutils genisoimage debootstrap

TMP="${TMP:-/var/tmp}"

DATE=$(date '+%Y-%m-%d-%H%M')
DIST="${DIST:-bok}"
REPO="${REPO:-http://apt.osdyson.org}"

# We will search for usr archive on CD:
USR_IMG=usr.img.$(echo $DATE | md5sum | cut -f1 -d ' ')

ISOLABEL="${ISOLABEL:-dyson-netinst}"
ISONAME="${ISONAME:-${ISOLABEL}-${DATE}}.iso"

ROOT="${TMP}/ROOT"
BOOTSTRAPFS="${BOOTSTRAPFS:-rpool/deb}"
ROOT="/$BOOTSTRAPFS"
BOOTARCH="${ROOT}/boot_archive"

# Disable boot-archive trigger, need bootadm >= 2.10+1:
export DEB_BOOTADM_DISABLE_UPDATE_ARCHIVE=1

# These packages are installed via APT, after debootstraping:
EXTRA_PACKAGES="
bash-completion
bzip2
debootstrap
dnsutils
drvtools
dtrace
file
host
illumos-nfs-common
installgrub
kmdb
less
lynx
mc
mdb-kvm
mdb-proc
openssh-client
openssh-server
pciutils
ping
python-apt
python-newt
screen
snoop
sysstat
traceroute
truss
vim
wget
xz-utils
"

# Move files from usr to usr1,
# Create links from usr to usr1.
# E. g.:
# usr_symlink_move usr/bin/bash
#   /usr/bin/bash -> /usr1/bin/bash
# usr_symlink_move usr/lib/devfsadm
#   /usr/lib/devfsadm -> /usr1/lib/devfsadm
usr_symlink_move() {
    f=${1#*/} # NO LEADING SLASH!
    d=$(dirname "$f")
    if [ ! -d "usr1/$d" ]; then
        mkdir -p "usr1/$d"
    fi
    mv -v "usr/$f" "usr1/$f"
    ln -sf "/usr1/$f" "usr/$f"
}

mount_in_root() {
    mount -F lofs /devices $ROOT/devices
    mount -F lofs /proc $ROOT/proc
    mount -F lofs /dev $ROOT/dev
}

umount_in_root() {
    umount $ROOT/dev
    umount $ROOT/proc
    umount $ROOT/devices
}

if [ -z "${ROOT}" ] || [ "${ROOT}" = / ]; then
    echo "WTF? Bad root: \`${ROOT}'" >&2
    exit 1
fi

rm -rf "${ROOT}"/*
if ! zfs list "${BOOTSTRAPFS}"; then
    zfs create "${BOOTSTRAPFS}"
fi
if zfs list "${BOOTSTRAPFS}@init"; then
    zfs rollback "${BOOTSTRAPFS}@init"
else

echo "Preparing base system (debootstrap)..."
debootstrap \
    --exclude=logrotate,locales,rsyslog,cron,gawk,aptitude,aptitude-common,libboost-iostreams1.48.0,libboost-iostreams1.49.0,libcwidget3,libboost-iostreams1.54.0 \
    --include=illumos-grub-eltorito,illumos-kernel \
    "${DIST}" \
    "${ROOT}" \
    "${REPO}"

mount_in_root
trap 'umount_in_root' SIGINT SIGTERM
set -x
chroot $ROOT apt-get update
chroot $ROOT apt-get -y --no-install-recommends install $EXTRA_PACKAGES
chroot $ROOT apt-get clean
set +x
trap - SIGINT SIGTERM
umount_in_root
zfs snapshot ${BOOTSTRAPFS}@init
fi

# http://osdyson.org/issues/120
# Dyson always boots with only one CPU
if ! [ -e "${ROOT}/etc/mach" ]; then
    echo -e 'pcplusmp\napix\nxpv_psm\n' > "${ROOT}/etc/mach"
fi

dpkg -l --root "${ROOT}" > pkg.list

mkdir "$ROOT/usr/install"
cp -a install DysonInstaller $ROOT/usr/install/
cat installer-screenrc > $ROOT/etc/screenrc
cat bash_profile > $ROOT/root/.bash_profile
cat vimrc > $ROOT/root/.vimrc

# debootstrap copied from the host system:
rm -f $ROOT/etc/resolv.conf

mv $ROOT/var/lib/dpkg $ROOT/usr/dpkg
ln -sf /usr/dpkg $ROOT/var/lib/dpkg

rm -rf "${ROOT}"/var/cache/*
rm -rf "${ROOT}"/etc/cron.*
rm -rf "${ROOT}"/var/log/*
rm -rf "${ROOT}"/usr/share/doc/*

# Remove messages and localized mans:
rm -rf "${ROOT}"/usr/share/locale/*/LC_MESSAGES
rm -rf "${ROOT}"/usr/share/man/*/man[0-9]*

# Enable root login by password, openssh >= 6.6:
sed -i \
    -e '/^PermitRootLogin/ s,without-password,yes,' \
    "${ROOT}/etc/ssh/sshd_config"

cat <<VFSTAB > "$ROOT/etc/vfstab"
#device         device          mount           FS      fsck    mount   mount
#to mount       to fsck         point           type    pass    at boot options
#
/devices/ramdisk:a -            /               ufs     1       no     rw,nologging
fd              -               /dev/fd         fd      -       no      -
swap            -               /tmp            tmpfs   -       yes     -

VFSTAB

echo "dyson-${DIST}-live" > "${ROOT}/etc/nodename"

# Set root password (just "root"):
echo 'root:root' | chpasswd -R "$ROOT"

# Script to find and mount usr.lzma:
sed "s/##USR_IMG##/$USR_IMG/g" "fs-root" > "${ROOT}/lib/svc/method/fs-root"
cat console-login > "${ROOT}/lib/svc/method/console-login"
cat net-physical > "${ROOT}/lib/svc/method/net-physical"

chmod +x "${ROOT}/lib/svc/method"/*

dummy_prog='#!/sbin/sh
exit 0
'
echo "$dummy_prog" > "${ROOT}/lib/svc/method/fs-usr"
echo "$dummy_prog" > "${ROOT}/lib/svc/method/boot-archive"
echo "$dummy_prog" > "${ROOT}/lib/svc/method/boot-archive-update"

# Disable SSH server by default
sed -i 's,enabled="true",enabled="false",' "${ROOT}/lib/svc/manifest/network/ssh.xml"

echo "Importing manifests..."
rm -f "${ROOT}/etc/svc/repository.db"
# bash or ksh, please:
bash "${ROOT}/lib/svc/method/manifest-import" \
    -f "${ROOT}/etc/svc/repository.db" \
    -d "${ROOT}/lib/svc/manifest"
# Thank you! Bye-bye!
echo "$dummy_prog" > "${ROOT}/lib/svc/method/manifest-import"

mkdir -p "${BOOTARCH}"
mkdir -p "${BOOTARCH}/usr"
mkdir -p "${BOOTARCH}/cdrom"
touch "${BOOTARCH}/reconfigure"

pushd "${ROOT}"

# We use 32-bit installgrub, but is not required to boot ;-)
if [ -e lib32 ]; then
    mkdir -p usr/lib32
    mv lib32/* usr/lib32/
    ln -sf usr/lib32 $BOOTARCH/lib32
fi

# Move some critical libs:
march=`dpkg-architecture -qDEB_HOST_MULTIARCH`
mkdir -p lib/$march
for lib in \
    libbrand \
    libdiskmgt \
    libexacct \
    libfmevent \
    libidmap \
    libipmi \
    liblzma \
    libpool \
    libproject \
    libsmbios \
    libsqlite \
    libsunavl \
    libtecla \
    libtopo \
    libxml2 \
    libzonecfg \
    ; do
    mv -v -f usr/lib/$march/$lib.so.* lib/$march/ || \
        mv -v -f usr/lib/$lib.so.* lib/$march/
done

# Moving some files from usr to usr1
# and creating symlinks from usr to usr1
usr_symlink_move usr/bin/cat
usr_symlink_move usr/bin/dash
usr_symlink_move usr/bin/grep
usr_symlink_move usr/bin/hostname
usr_symlink_move usr/bin/ln
usr_symlink_move usr/bin/ls
usr_symlink_move usr/bin/rm
usr_symlink_move usr/bin/sh
usr_symlink_move usr/lib/devfsadm
usr_symlink_move usr/lib/fs/hsfs/mount
usr_symlink_move usr/lib/fs/ufs/mount
usr_symlink_move usr/sbin/devfsadm
usr_symlink_move usr/sbin/dladm
usr_symlink_move usr/sbin/ipadm
usr_symlink_move usr/sbin/lofiadm

# usr2 will be packed and stored on CD:
mv usr usr2

# This is usr before usr2 is mounted,
# fs-root will mount usr2 and replace usr -> usr2
ln -sf usr1 usr
ln -sf ../../sbin usr1/sbin

# List here files or directories which
# should be *moved* to boot archive.
# Caution: files from /usr require
# special treating: see above
tar --remove-files -c -f - \
    bin \
    boot/solaris \
    dev \
    devices \
    etc \
    home \
    kernel \
    lib \
    media \
    mnt \
    opt \
    platform \
    proc \
    root \
    run \
    sbin \
    srv \
    system \
    tmp \
    usr \
    usr1 \
    var \
| tar xf - -C "${BOOTARCH}"

# Restore the kernel:
mkdir -p platform/i86pc/kernel/amd64
cp -p "${BOOTARCH}/platform/i86pc/kernel/amd64/unix" \
    platform/i86pc/kernel/amd64/

# Mount point for compressed /usr:
mkdir "${BOOTARCH}/usr2"

popd # Exit from $ROOT


(cd "${BOOTARCH}" && find * -ls) > bootarch.list

echo "Making boot archive..."
sync; sync

size=$(du -s -m "${BOOTARCH}" | cut -f1)
((size+=20)) # +20 MB of free space
dd if=/dev/zero of="${ROOT}/boot/boot_archive" bs=1M count="$size"
lofidev=$(lofiadm -a "${ROOT}/boot/boot_archive")
rlofidev="${lofidev/lofi/rlofi}"
yes | newfs -m 0 "${rlofidev}"
mkdir -p "${ROOT}/boot/boot_archive.mount"
mount "${lofidev}" "${ROOT}/boot/boot_archive.mount"
mv "${BOOTARCH}"/* "${ROOT}/boot/boot_archive.mount"/
umount "${ROOT}/boot/boot_archive.mount"
lofiadm -d "${lofidev}"
rmdir "${BOOTARCH}"
rmdir "${ROOT}/boot/boot_archive.mount"
gzip -9 -f "${ROOT}/boot/boot_archive"

echo "Making usr archive..."
# usr will be mounted from usr.lzma:
genisoimage \
   -o "${ROOT}/${USR_IMG}" \
   -N -l -R -U \
   -allow-multidot \
   -quiet -no-iso-translate -cache-inodes -d -D \
   -V "usr" \
   "${ROOT}/usr2"

rm -rf "${ROOT}/usr2"
lofiadm -C lzma "${ROOT}/${USR_IMG}"


echo "Configuring GRUB..."
cat <<GRUB > "${ROOT}/boot/grub/menu.lst"
default=0
timeout=3
foreground=ffffff
background=215ECA
title Dyson ($DIST) installer and LiveCD, $DATE
    kernel /platform/i86pc/kernel/amd64/unix
    module /boot/boot_archive.gz
GRUB

echo "Making final ${ISONAME}..."
genisoimage \
    -o "${ISONAME}" \
    -b boot/grub/stage2_eltorito \
    -c .catalog \
    -no-emul-boot \
    -boot-load-size 4 \
    -boot-info-table \
    -N -l -R -U \
    -allow-multidot \
    -no-iso-translate \
    -cache-inodes \
    -d -D \
    -V "${ISOLABEL}" \
    "${ROOT}"

ls -lh "${ISONAME}"

exit 0