#! /bin/sh
set -e

rm -rf config

echo "Building on $(hostname --fqdn)"

SEEDMIRROR=http://people.canonical.com/~ubuntu-archive/seeds/
if [ -z "$MIRROR" ]; then
	case $(hostname --fqdn) in
		*.0c3.net)
			case $ARCH in
				i386|amd64)	MIRROR=http://mirrors.0c3.net/ubuntu/ ;;
				*)		MIRROR=http://mirrors.0c3.net/ubuntu-ports/ ;;
			esac
			;;
		*.ubuntu.com)		MIRROR=http://ftpmaster.internal/ubuntu/
					SEEDMIRROR=http://archive-team.internal/seeds/
					;;
		*.buildd)		MIRROR=http://ftpmaster.internal/ubuntu/
					SEEDMIRROR=http://archive-team.internal/seeds/
					;;
		*.ppa|*.scalingstack)	MIRROR=http://ftpmaster.internal/ubuntu/
					SEEDMIRROR=http://archive-team.internal/seeds/
					;;
		*)	case $ARCH in
				i386|amd64)	MIRROR=http://archive.ubuntu.com/ubuntu/ ;;
				*)		MIRROR=http://ports.ubuntu.com/ubuntu-ports/ ;;
			esac
			;;
	esac
fi

mkdir -p config
cp -af /usr/share/livecd-rootfs/live-build/functions config/functions
cp -af /usr/share/livecd-rootfs/live-build/lb_*_layered config/
cp -af /usr/share/livecd-rootfs/live-build/snap-seed-parse.py config/snap-seed-parse

mkdir -p config/package-lists

. config/functions

OPTS=
COMPONENTS=
BINARY_REMOVE_LINUX=:
BINARY_IMAGES=none
MEMTEST=none
SOURCE='--source false'
BOOTLOADER=none
BOOTAPPEND_LIVE=
LIVE_TASK=
PREINSTALLED=false
PREINSTALL_POOL=
PREINSTALL_POOL_SEEDS=
PREFIX="livecd.$PROJECT${SUBARCH:+-$SUBARCH}"

CHROOT_HOOKS=
BINARY_HOOKS=

APT_OPTIONS=" --yes -oDebug::pkgDepCache::AutoInstall=yes "

PASSES_TO_LAYERS=false
_PASSES_TO_LAYERS=		# Stores the initial value of PASSES_TO_LAYERS
PASSES=

_check_immutable_passes_to_layers () {
	# Check that PASSES_TO_LAYERS didn't change ie we didn't switch from layer
	# to non-layer image format and vice versa.
	if [ -z "$_PASSES_TO_LAYERS" ]; then
		_PASSES_TO_LAYERS=$PASSES_TO_LAYERS
	fi

	if [ "$_PASSES_TO_LAYERS" != "$PASSES_TO_LAYERS" ]; then
		echo "ERROR: PASSES_TO_LAYERS has changed from $_PASSES_TO_LAYERS to $PASSES_TO_LAYERS between 2 API calls. Please set it first."
		exit 1
	fi
}

_check_layers_only_API () {
	# Check if a function is designed only for layered mode
	# $1 name of the function
	if [ "$PASSES_TO_LAYERS" != "true" ]; then
		echo "$1 should only be used in layered mode, with PASSES_TO_LAYERS set to true"
		exit 1
	fi
}

_register_pass () {
	# In layer mode, record a pass into the list of passes
	# $1 Name of the pass
	[ "$PASSES_TO_LAYERS" != "true" ] && return

	PASSES="$PASSES $1"
}

add_task ()
{
	local pass="$1"
	shift
	local task
	local snap_list_file
	local snap_list_files
	local curseed

	_check_immutable_passes_to_layers
	_register_pass "$pass"

	# The removal of direct task installation support from live-build
	# poses some problems.  If the chroot has multiarch configured - for
	# example, if we're building for amd64 - then dumpavail will show
	# foreign-architecture packages which will have their own Task
	# lines, but which we don't want to install.  (Compare
	# PackageContainerInterface::FromTask in apt, which restricts task
	# expansion to the native architecture.)  We therefore restrict our
	# search to stanzas with Architecture: $ARCH or all.
	#
	# However, even this may not be accurate enough.  At the moment I
	# have no idea what happens if an Architecture: all package has
	# different Task fields on different architectures.  This is
	# probably a lurking timebomb that we need to fix.  In the meantime,
	# the Architecture restriction at least saves us from abject
	# failure.
	#
	# We want as well to grab the snap list for each PASS. Resolve for all
	# given task, and deduplicate them to generate snaps for the PASS.

	for task; do
		# We need a ridiculous number of backslashes to protect
		# parentheses from eval.
		echo "!chroot chroot apt-cache dumpavail | grep-dctrl -nsPackage \\\\\\( -XFArchitecture $ARCH -o -XFArchitecture all \\\\\\) -a -wFTask $task" >> "config/package-lists/livecd-rootfs.list.chroot_$pass"

		curseed=$(seed_from_task ${task})
		if [ -z "${curseed}" ]; then
			echo "W: No seed matching task ${task}"
			continue
		fi
		snap_list_file="config/package-lists/seed.${curseed}.snaplist.full"
		snap_from_seed "${curseed}" $snap_list_file
		if [ -e "$snap_list_file" ]; then
			snap_list_files="${snap_list_files} $snap_list_file"
		fi
	done
	# The snap list is one line, and could be duplicated between seeds via inheritance.
	# Uniquely sort them and store them back in one line.
	if [ -n "${snap_list_files}" ]; then
		cat ${snap_list_files}|xargs -n1|sort -u > "config/package-lists/livecd-rootfs.snaplist.chroot_${pass}.full"
		rm ${snap_list_files}
	fi
}

add_package ()
{
	# Adds a pass named pass_name composed of packages to install
	# $1 pass
	# $@ list of packages

	local pass="$1"
	shift
	local pkg

	_check_immutable_passes_to_layers
	_register_pass "$pass"

	for pkg; do
		echo "$pkg" >> "config/package-lists/livecd-rootfs.list.chroot_$pass"
	done
}

remove_package ()
{
	# Adds a pass named pass_name composed of packages to remove
	# $1 pass
	# $@ list of packages

	local pass="$1"
	shift
	local pkg

	_check_immutable_passes_to_layers
	_check_layers_only_API "remove_package"
	_register_pass "$pass"

	for pkg; do
		echo "$pkg" >> "config/package-lists/livecd-rootfs.removal-list.chroot_$pass"
	done
}

add_packages_from_seed_regexp () {
	# Creates one or more passes, depending on base_pass_name, from any seeds matching seed_regexp.
	# $1 base pass
	# $2 seeds (regexp)
	local pass

	_check_immutable_passes_to_layers
	_check_layers_only_API "add_packages_from_seed_regexp"

	for seed in $(ls config/germinate-output/|grep -P "$2"); do
		pass=${1}.${seed}
		_register_pass "$pass"
		list_packages_from_seed ${seed} >> config/package-lists/livecd-rootfs.list.chroot_$pass
	done
}

remove_packages_from_seed_regexp() {
	# Creates one or more passes, based on base_pass_name, from any seed matching seed_regexp.
	# This package list is a list of packages to remove (and included in a previous dependent
	# pass then), resulting from base_seed - {current_seed_match_from_regexp}.
	# $1 base pass
	# $2 base seed
	# $3 seeds to remove from base seed (regexp). If empty, a no-<base-seed> sublayer is generated.
	local pass

	_check_immutable_passes_to_layers
	_check_layers_only_API "remove_packages_from_seed_regexp"

	local seed_regexp="$3"
	if [ -z "${seed_regexp}" ]; then
		pass="${1}.no-${2}"
		_register_pass "$pass"
		subtract_package_lists ${2} "" >> config/package-lists/livecd-rootfs.removal-list.chroot_$pass
		return
	fi

	for seed in $(ls config/germinate-output/|grep -P "$seed_regexp"); do
	   pass="${1}.${seed}"
	   _register_pass "$pass"
	   subtract_package_lists ${2} ${seed} >> config/package-lists/livecd-rootfs.removal-list.chroot_$pass
	done
}

add_chroot_hook ()
{
	CHROOT_HOOKS="${CHROOT_HOOKS:+$CHROOT_HOOKS }$1"
}

add_binary_hook ()
{
	BINARY_HOOKS="${BINARY_HOOKS:+$BINARY_HOOKS }$1"
}

_sanitize_passes ()
{
	# Returns an uniquely ordered list of passes and ensure dependency tree is coherent
	# $1 list of passes
	local passes="$1"
	[ -z "$passes" ] && return

	passes=$(echo $passes | tr ' ' '\n' | sort -u)
	for pass in $passes; do
		parent=$(get_parent_pass $pass)
		# if root pass, no parent to find
		[ -z "$parent" ] && continue
		if [ $(echo "$passes"|grep -cE "^$parent\$") -ne 1 ]; then
			echo "ERROR: '$parent' is required by '$pass' but is missing. Registered passes are:\n$passes"
			exit 1
		fi
	done

	# return the list of passes
	echo $passes
}

_get_live_passes ()
{
	# Returns a list of all passes that ends with .live for automated live passes detection
	# $1 list of passes
	local passes="$1"
	local livepasses=""
	[ -z "$passes" ] && return

	for pass in $passes; do
		if echo $pass | grep -Eq '\.live$'; then
			livepasses="$pass $livepasses"
		fi
	done
	echo $livepasses
}

if [ -z "${IMAGEFORMAT:-}" ]; then
	case $PROJECT:${SUBPROJECT:-} in
		ubuntu-cpc:*|ubuntu:desktop-preinstalled)
			case $SUBARCH in
				raspi|imx6)
					IMAGEFORMAT=ubuntu-image
					;;
				*)
					IMAGEFORMAT=ext4
					;;
			esac
			;;
		ubuntu-server:live)
			IMAGEFORMAT=plain
			;;
	esac
fi

skip_lb_stage() {
	STAGE="$1"
	mkdir -p .build
	touch ".build/$STAGE"
}

case $IMAGEFORMAT in
	ext2|ext3|ext4)
		OPTS="${OPTS:+$OPTS }--initramfs none --chroot-filesystem $IMAGEFORMAT"
		PREINSTALLED=true
		;;
	plain)
		case $PROJECT:${SUBPROJECT:-} in
			ubuntu-server:live)
	                        touch config/universe-enabled
				;;
			*)
				PREINSTALLED=true
				;;
		esac
		OPTS="${OPTS:+$OPTS }--initramfs none --chroot-filesystem $IMAGEFORMAT"
		;;

	ubuntu-image)
		UBUNTU_IMAGE_ARGS=""
		case "$ARCH+${SUBARCH:-}" in
			amd64+*)
				MODEL=pc-amd64 ;;
			i386+*)
				MODEL=pc-i386 ;;
			arm64+snapdragon)
				MODEL=dragonboard ;;
			armhf+raspi)
				MODEL=pi ;;
			armhf+raspi2)
				MODEL=pi2 ;;
			armhf+raspi3)
				MODEL=pi3 ;;
			arm64+raspi)
				MODEL=pi-arm64 ;;
			arm64+raspi3)
				MODEL=pi3-arm64 ;;
			armhf+cm3)
				MODEL=cm3 ;;
			armhf+imx6)
				MODEL=nitrogen6x ;;
			*)
				echo "Model $ARCH+${SUBARCH:-} unknown to livecd-rootfs" >&2
				exit 1
				;;
		esac

		# If we have a datestamp coming from cdimage, use that to populate
		# .disk/info on the target image
		if [ -n "$NOW" ]; then
			echo "$NOW" > config/disk-info
			UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS --disk-info config/disk-info"
		fi

		if [ $PROJECT = "ubuntu-core" ]; then
			# snap-based core images

			CHANNEL="${CHANNEL:-edge}"
			case $MODEL in
				pc-amd64|pc-i386)
					if [ -z "${SUBARCH:-}" ]; then
						case $SUITE in
							xenial|bionic)
								UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS --image-size 3700M"
								;;
							*)
								UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS --image-size 8G"
								;;
						esac
					fi
					;;
				*) ;;
			esac
			case $SUITE in
				xenial)
					# Ubuntu Core 16
					UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS -c $CHANNEL"
					;;
				bionic)
					# Ubuntu Core 18
					MODEL="ubuntu-core-18-${MODEL#pc-}"
					UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS -c $CHANNEL"
					;;
				*)
					if [ "${MODEL}" = "pi" ]; then
						MODEL=pi-armhf
					fi
					# Ubuntu Core 20
					# Currently uc20 assertions do not support global
					# channel overrides, instead we have per-channel models
					case $CHANNEL in
						stable)
							MODEL="ubuntu-core-20-${MODEL#pc-}"
							;;
						candidate|beta|edge|dangerous)
							MODEL="ubuntu-core-20-${MODEL#pc-}-${CHANNEL}"
							;;
						dangerous-*)
							# That being said, the dangerous grade *does*
							# support channel overrides, so we can use the
							# dangerous model assertion and override the channel
							# freely.
							MODEL="ubuntu-core-20-${MODEL#pc-}-dangerous"
							CHANNEL=${CHANNEL#dangerous-}
							UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS -c $CHANNEL"
							;;
						*)
							echo "Unknown CHANNEL ${CHANNEL} specification for ${SUITE}"
							exit 1
							;;
					esac
					;;
			esac

			case "$ARCH+${SUBARCH:-}" in
				amd64+kassel)
					EXTRA_SNAPS="$EXTRA_SNAPS core bluez alsa-utils"
					;;
				*) ;;
			esac
			for snap in $EXTRA_SNAPS; do
				UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS --extra-snaps $snap"
			done
			echo "IMAGEFORMAT=$IMAGEFORMAT" >> config/common
			echo "UBUNTU_IMAGE_ARGS=\"$UBUNTU_IMAGE_ARGS\"" >> config/common
			# Store model assertion in top dir to get it picked up later as a build artifact
			env SNAPPY_STORE_NO_CDN=1 snap known --remote model series=16 model="$MODEL" brand-id=canonical > "$PREFIX".model-assertion
			echo "Configured ubuntu-image for the following model assertion:"
			cat "$PREFIX".model-assertion
			echo "----------------------------------------------------------"
		else
			# classic images

			# Certain models have different names but are built from the same source gadget tree
			BRANCH=18
			case $MODEL in
				pi-arm64|pi3-arm64)
					MODEL=pi
					BRANCH=18-arm64
					;;
				pi)
					BRANCH=18-armhf
					;;
			esac

			UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS${PROPOSED:+ --with-proposed}"
			UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS${EXTRA_PPAS:+ --extra-ppas \"$EXTRA_PPAS\"}"

			# We need to look in two places for the gadget tree:
			# - Launchpad hosted gadgets will be in the snap-gadget repo
			# - Github hosted gadgets are mirrored into a github-mirror repo
			git clone git://git.launchpad.net/~canonical-foundations/snap-$MODEL/+git/snap-$MODEL -b $BRANCH config/$PREFIX-gadget || git clone git://git.launchpad.net/~canonical-foundations/snap-$MODEL/+git/github-mirror -b $BRANCH config/$PREFIX-gadget

			echo "IMAGEFORMAT=$IMAGEFORMAT" >> config/common
			echo "SUITE=$SUITE" >> config/common
			echo "UBUNTU_IMAGE_ARGS=\"$UBUNTU_IMAGE_ARGS\"" >> config/common

			echo "Configured ubuntu-image for the following gadget model: $MODEL"
		fi

		# Save the model name used for building, mostly for any model-specific hook execution
		echo "MODEL=$MODEL" >> config/common
		# Fake finished configuration for lb build
		mkdir -p .build
		touch .build/config
		exit 0
		;;

	none)
		# Currently the IMAGEFORMAT none format is used only for ubuntu-image
		# targeted image builds which, currently, only target physical devices.
		OPTS="${OPTS:+$OPTS }--chroot-filesystem $IMAGEFORMAT"
		;;
	*)
		case $PROJECT in
			ubuntu-server)
				;;
			ubuntu)
				if [ "$SUBPROJECT" != "canary" ]; then
					add_package live lupin-casper
				fi
				;;
			*)
				add_package live lupin-casper
				;;
		esac
		;;
esac

if [ "$PREINSTALLED" = "true" ]; then
	# Touch a random file that we can refer back to during build,
	# cause that's wildly hackish
	touch config/universe-enabled
	case $PROJECT in
		kubuntu*)
			add_package live oem-config-kde ubiquity-frontend-kde
			add_package live ubiquity-slideshow-kubuntu
			;;
		lubuntu*)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-lubuntu
			;;
		xubuntu*)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-xubuntu
			;;
		ubuntu-mate)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-ubuntu-mate
			;;
		ubuntu-server)
			add_package live oem-config-debconf ubiquity-frontend-debconf
			;;
		ubuntu-core|ubuntu-base|base|ubuntu-cpc)
			;;
		ubuntu)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-ubuntu
			if [ "$SUBPROJECT" = "desktop-preinstalled" ]; then
				add_package live language-pack-en-base
			fi
			;;
		*)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-ubuntu
			;;
	esac
fi

case $BINARYFORMAT in
	iso*|usb*)
		BINARY_IMAGES="$BINARYFORMAT"
		MEMTEST=memtest86+
		BOOTLOADER=syslinux
		OPTS="${OPTS:+$OPTS }--zsync=false"
		;;
esac

if [ "${SUBPROJECT:-}" = minimized ]; then
	OPTS="${OPTS:+$OPTS }--bootstrap-flavour=minimal --linux-packages=linux-image"
fi

mkdir -p config/germinate-output
case $PROJECT in
        kubuntu-active*)
                SEED=kubuntu-active.$SUITE
                ;;
        kubuntu*)
                SEED=kubuntu.$SUITE
                ;;
        xubuntu*)
                SEED=xubuntu.$SUITE
                ;;
        ubuntu-mate*)
                SEED=ubuntu-mate.$SUITE
                ;;
        lubuntu*)
                SEED=lubuntu.$SUITE
                ;;
        ubuntu-budgie*)
                SEED=ubuntu-budgie.$SUITE
                ;;
        ubuntukylin*)
                SEED=ubuntukylin.$SUITE
                ;;
        ubuntustudio*)
                SEED=ubuntustudio.$SUITE
                ;;
        *)
                SEED=ubuntu.$SUITE
                ;;
esac

if ! [ -e config/germinate-output/structure ]; then
        echo "Running germinate..."
        (cd config/germinate-output && germinate --no-rdepends --no-installer \
                -S $SEEDMIRROR -m $MIRROR -d $SUITE -s $SEED \
                ${COMPONENTS:+-c "$COMPONENTS"} -a $ARCH)
fi

case $PROJECT in
	ubuntu|ubuntu-dvd)

		case ${SUBPROJECT:-} in
			canary)
				PASSES_TO_LAYERS="true"
				add_task minimal minimal standard ubuntu-desktop-minimal ubuntu-desktop-minimal-default-languages
				add_task minimal.standard ubuntu-desktop ubuntu-desktop-default-languages
				add_task minimal.standard.live ubuntu-live
				add_package minimal.standard.live lupin-casper

				# LANG PASS for minimal and standard
				remove_packages_from_seed_regexp minimal desktop-minimal-default-languages '^desktop-minimal-(?!default-languages)[^.]+$'
				remove_packages_from_seed_regexp minimal desktop-minimal-default-languages ''  # none (if no default langpack is selected)
				remove_packages_from_seed_regexp minimal.standard desktop-default-languages '^desktop-(?!default-languages|minimal|common)[^.]+$'
				remove_packages_from_seed_regexp minimal.standard desktop-default-languages ''  # none (if no default langpack is selected)
				;;
			*)
				LIVE_TASK='ubuntu-live'
				add_task install minimal standard ubuntu-desktop
				add_task live ubuntu-desktop-minimal-default-languages ubuntu-desktop-default-languages
				KERNEL_FLAVOURS='generic-hwe-20.04'
				;;
		esac
		;;

	kubuntu|kubuntu-dvd)
		add_task install minimal standard
		add_task install kubuntu-desktop
		LIVE_TASK='kubuntu-live'
		COMPONENTS='main restricted universe'
		add_chroot_hook remove-gnome-icon-cache
		;;

	kubuntu-active)
		add_task install minimal standard kubuntu-active
		LIVE_TASK='kubuntu-active-live'
		COMPONENTS='main restricted universe'
		add_chroot_hook remove-gnome-icon-cache
		;;

	kubuntu-plasma5)
		add_task install minimal standard
		add_package install kubuntu-plasma5-desktop
		# Technically cheating, but PPAs don't have tasks and the
		# live seed doesn't have a corresponding metapackage.  We'll
		# get away with this as long as kubuntu-desktop and
		# kubuntu-plasma5-desktop don't grow too far apart.
		LIVE_TASK='kubuntu-live'
		COMPONENTS='main restricted universe'
		add_chroot_hook remove-gnome-icon-cache
		;;

	edubuntu|edubuntu-dvd)
		add_task install minimal standard ubuntu-desktop edubuntu-desktop-gnome
		LIVE_TASK='edubuntu-live'
		COMPONENTS='main restricted universe'
		;;

	xubuntu)
		add_task install minimal standard xubuntu-desktop
		add_package install xterm
		LIVE_TASK='xubuntu-live'
		COMPONENTS='main restricted universe multiverse'
		case $ARCH in
			amd64|i386)	KERNEL_FLAVOURS=generic ;;
		esac
		;;

	ubuntu-netbook)
		add_task install minimal standard ubuntu-netbook
		LIVE_TASK='netbook-live'
		;;

	mythbuntu)
		add_task install minimal standard mythbuntu-desktop
		LIVE_TASK='mythbuntu-live'
		COMPONENTS='main restricted universe multiverse'
		;;

	lubuntu)
		add_task install minimal standard lubuntu-desktop
		LIVE_TASK='lubuntu-live'
		COMPONENTS='main restricted universe multiverse'
		case $ARCH in
			amd64|i386)	KERNEL_FLAVOURS=generic ;;
		esac
		;;

	ubuntu-gnome)
		add_task install minimal standard ubuntu-gnome-desktop
		LIVE_TASK='ubuntu-gnome-live'
		COMPONENTS='main restricted universe'
		;;

	ubuntu-budgie)
		add_task install minimal standard ubuntu-budgie-desktop
		LIVE_TASK='ubuntu-budgie-live'
		COMPONENTS='main restricted universe'
		;;

	ubuntu-mate)
		add_task install minimal standard ubuntu-mate-core ubuntu-mate-desktop
		LIVE_TASK='ubuntu-mate-live'
		COMPONENTS='main restricted universe multiverse'
		;;

	ubuntustudio-dvd)
		add_task install minimal standard ubuntustudio-desktop ubuntustudio-audio ubuntustudio-fonts ubuntustudio-graphics ubuntustudio-video ubuntustudio-publishing ubuntustudio-photography
		case $SUITE in
			focal)
				# ubuntustudio-default-settings in focal
				# release has a Recommends to this kernel,
				# which makes it impossible to update the
				# kernel later on, since we would install the
				# -updates and release kernel, which isn't
				# allowed and causes the squashfs to fail to
				# build.  Hack out the focal-release kernel and
				# let the rest of the build process pull in the
				# right one. (See right below.)
				for package in linux-lowlatency linux-image-lowlatency linux-headers-lowlatency linux-image-5.4.0-26-lowlatency linux-headers-5.4.0-26-lowlatency; do
					sed -i "s/$/ -a --not -XFPackage ${package}/" \
						"config/package-lists/livecd-rootfs.list.chroot_install"
				done
				;;
		esac
		COMPONENTS='main restricted universe multiverse'
		case $ARCH in
			amd64|i386)	KERNEL_FLAVOURS=lowlatency ;;
		esac
		;;

	ubuntukylin)
		add_task install minimal standard ubuntukylin-desktop
		add_package install ubuntukylin-default-settings
		LIVE_TASK='ubuntukylin-live'
		COMPONENTS='main restricted universe'
		;;

	base)
		add_task install minimal standard
		;;

	ubuntu-server)
		add_task install minimal
		case ${SUBPROJECT:-} in
			live)
				add_task install standard
				add_task install server
				add_package install cloud-init
				;;
		esac
		COMPONENTS='main'
		PREINSTALL_POOL_SEEDS='server-ship'
		;;

	ubuntu-core)
		OPTS="${OPTS:+$OPTS }--apt-recommends false"

		# some workarounds because the seeds are not quite
		# corrent at the moment
		add_package install dbus
		add_package install isc-dhcp-client
		add_package install libpam-systemd
		add_package install ppp
		add_package install watchdog
		# no Task: header yet
		add_package install snapd
		add_package install ubuntu-core-snapd-units
		add_package install nplan
                # we want all arches to have u-boot-tools
                add_package install u-boot-tools

		# no minimal as we want to be really minimal
		#add_task install minimal
		add_task install ubuntu-core

                # more packages are pulled in via the seed.
                # (important to remember when comparing to the
                #  livecd-rootfs from ppa:snappy-dev/image)

		case $ARCH in
			i386)
				# efi support can go once the task
				# header is available for grub-efi-ia32-bin
				add_package install grub-efi-ia32-bin
				;;
		esac

		# generic kernel etc
		KERNEL_FLAVOURS=none
		case $ARCH in
			i386)
				add_package install grub-pc
				;;
			amd64)
				add_package install grub-pc-bin
				add_package install grub-efi-amd64-signed
				add_package install shim-signed
				;;
		esac
		OPTS="${OPTS:+$OPTS }--linux-packages=none --initramfs=none"

		# contains the framework definition
		add_package install ubuntu-core-libs

		# universe needed for 'system-image-cli' and multiverse for firmware
		COMPONENTS='main restricted universe multiverse'
		OPTS="${OPTS:+$OPTS }--bootstrap-flavour=minimal"
		;;

	ubuntu-base)
		OPTS="${OPTS:+$OPTS }--bootstrap-flavour=minimal"
		;;

	ubuntu-cpc)
		if [ "${SUBPROJECT:-}" = minimized ]; then
			add_task install cloud-image
			add_package install sudo lxd-installer
			# linux-kvm currently only exists for amd64, so fall back to the
			# virtual flavour for other architectures
			if [ "$ARCH" = "amd64" ]; then
				KERNEL_FLAVOURS=kvm
			else
				KERNEL_FLAVOURS=virtual
			fi
		else
			add_task install minimal standard cloud-image
			add_package install ubuntu-minimal
			KERNEL_FLAVOURS=virtual
		        case $ARCH in
				armhf|arm64|ppc64el|powerpc)
					add_task install server
					;;
			esac
		fi

		BINARY_REMOVE_LINUX=false
		OPTS="${OPTS:+$OPTS }--initramfs=none"
		case $ARCH in
			armhf)
				KERNEL_FLAVOURS=generic-lpae
				add_package install flash-kernel
				;;
			arm64)
				add_package install flash-kernel
				;;
		esac
		OPTS="${OPTS:+$OPTS }--system=normal"
		OPTS="${OPTS:+$OPTS }--hdd-label=cloudimg-rootfs"
		OPTS="${OPTS:+$OPTS }--ext-resize-blocks=536870912 --ext-block-size=4096"
		OPTS="${OPTS:+$OPTS }--ext-fudge-factor=15"
		;;

	*)
		echo "unknown project $PROJECT" >&2
		exit 2
		;;
esac

case $SUBPROJECT in
	buildd)
		OPTS="${OPTS:+$OPTS }--archive-areas main"
		COMPONENTS='main restricted universe multiverse'
		OPTS="${OPTS:+$OPTS }--apt-recommends false"
		OPTS="${OPTS:+$OPTS }--apt-secure false"
		OPTS="${OPTS:+$OPTS }--parent-mirror-binary ${MIRROR}"
		# XXX cjwatson 2018-04-27: We need to work out how to make
		# this conditional so that we can do things like building
		# buildd chroots with -updates.  This probably involves
		# either extending the PROPOSED hack or fixing the strange
		# way that SUITE is in fact a series; in either case it's
		# likely to involve work both here and in launchpad-buildd.
		OPTS="${OPTS:+$OPTS }--security false --volatile false"

		add_package install adduser
		add_package install pkgbinarymangler
		add_package install ca-certificates
		add_package install gpg
		add_package install gpg-agent
		add_package install fakeroot
		add_package install build-essential
		# Needed for LXD-based builds.
		add_package install init
		# Not strictly build-essential, but traditionally present
		# and a variety of things fail without it.
		add_package install tzdata

		cp -af /usr/share/livecd-rootfs/live-build/make-lxd-metadata.py config/make-lxd-metadata
		;;
esac

# we'll expand the base seed given here according to the STRUCTURE file, and
# then look in all of the seeds found to see which snaps are seeded
case $PROJECT:${SUBPROJECT:-} in
	ubuntu:*|kubuntu*:*|lubuntu*:*|xubuntu*:*|ubuntu-mate*:*|ubuntustudio*:*|ubuntukylin*:*|ubuntu-budgie*:*)
		BASE_SEED='desktop'
		;;
	ubuntu-cpc:*)
		BASE_SEED='server'
		;;
	ubuntu-server:live)
		BASE_SEED='server'
		;;
esac

if [ "$PASSES_TO_LAYERS" != "true" ] && [ -n "${BASE_SEED}" ]; then
	snap_from_seed "${BASE_SEED}" config/seeded-snaps
fi
if [ "$PROJECT:${SUBPROJECT:-}" = ubuntu-cpc:minimized ]; then
	# We install a lxc script that installs the snap when invoked. We don't
	# want any other snaps to come in without due consideration, so fail the
	# build if we see such a snap.
	for snap in `cat config/seeded-snaps`; do
		case $snap in
			lxd | lxd=*)
				;;
			*)
				echo "Unexpected seeded snap for ubuntu-cpc:minimized build: $snap"
				exit 1
				;;
		esac
	done

	# Truncate but don't delete to a) prevent any snaps from being seeded,
	# while at the same time b) triggering initialization of assertions.
	truncate --size 0 config/seeded-snaps
fi

# grab a list of packags to remove for a "minimal" installation from the seed
# mirror for this project
if [ -n "${BASE_SEED}" ] && [ -n "${BASE_SEED}" ]; then
	minimal_packages_url=${SEEDMIRROR}/${SEED}/${BASE_SEED}.minimal-remove
	echo -n "Checking ${minimal_packages_url} for a minimal installation list... "
	minimal_packages_remove=$(wget -q -O- ${minimal_packages_url} | sed -e '/\s*#.*$/d' -e '/^\s*$/d')
	if [ -n "${minimal_packages_remove}" ]; then
		echo "${minimal_packages_remove}" > config/manifest-minimal-remove
		echo "$(echo ${minimal_packages_remove} | tr '\n' ' ')"
	else
		echo "failed to retrieve, not including."
	fi
fi

export APT_OPTIONS

if [ "$PREINSTALLED" != "true" ] && [ "$PASSES_TO_LAYERS" != "true" ] && [ "$LIVE_TASK" ]; then
	add_task live "$LIVE_TASK"
fi

case $PROJECT in
	ubuntu-dvd)
		add_task install ubuntu-usb
		add_task live ubuntu-usb-live
		;;

	*-dvd)
		add_task live "$PROJECT-live"
		;;
esac

case $ARCH in
	armhf|arm64)
		KERNEL_FLAVOURS="${SUBARCH:-$KERNEL_FLAVOURS}"
		case $SUBARCH in
			raspi)
				# Generic Raspberry Pi images
				COMPONENTS='main restricted universe multiverse'
				add_package install linux-firmware-raspi2 u-boot-rpi flash-kernel u-boot-tools wpasupplicant
				BINARY_REMOVE_LINUX=false
				;;
			imx6)
				COMPONENTS='main restricted universe multiverse'
				KERNEL_FLAVOURS=generic
				add_package install flash-kernel u-boot-tools wpasupplicant
				BINARY_REMOVE_LINUX=false
				;;

		esac
		;;
esac

case $PROJECT:${SUBPROJECT:-} in
	ubuntu-server:*|ubuntu-base:*)
		OPTS="${OPTS:+$OPTS }--linux-packages=none --initramfs=none"
		KERNEL_FLAVOURS=none
		BINARY_REMOVE_LINUX=false
		;;
esac

add_chroot_hook update-apt-file-cache
add_chroot_hook update-apt-xapian-index
add_chroot_hook update-mlocate-database
add_chroot_hook remove-dbus-machine-id
add_chroot_hook remove-openssh-server-host-keys
add_chroot_hook remove-udev-persistent-rules

case $PROJECT in
	# if any flavours want to strip .pyc files from their live images, add them here
	_)
		add_chroot_hook remove-python-py
		;;
esac

lb config noauto \
	--mode ubuntu \
	--distribution "$SUITE" \
	--iso-preparer "livecd-rootfs" \
	--bootstrap-keyring ubuntu-keyring \
	--binary-images "$BINARY_IMAGES" \
	--memtest "$MEMTEST" \
	$SOURCE \
	--build-with-chroot false \
	${MIRROR:+--parent-mirror-bootstrap $MIRROR} \
	${COMPONENTS:+--parent-archive-areas "$COMPONENTS"} \
	--apt-source-archives false \
	${KERNEL_FLAVOURS:+--linux-flavours "$KERNEL_FLAVOURS"} \
	--initsystem none \
	--bootloader "$BOOTLOADER" \
	${INITRAMFS_COMPRESSION:+--initramfs-compression "$INITRAMFS_COMPRESSION"} \
	--checksums none \
	--cache false \
	${BOOTAPPEND_LIVE:+--bootappend-live "$BOOTAPPEND_LIVE"} \
	$OPTS \
	"$@"

PASSES=$(_sanitize_passes "$PASSES")
LIVE_PASSES=${LIVE_PASSES:-$(_get_live_passes "$PASSES")}

if [ -n "$PASSES" ] && [ -z "$LIVE_PASSES" ]; then
	Echo_warning "Multi-layered mode is enabled, but we didn't find any live pass." \
	             "Either set \$LIVE_PASSES or add a pass ending with '.live'."
fi

echo "LB_CHROOT_HOOKS=\"$CHROOT_HOOKS\"" >> config/chroot
echo "SUBPROJECT=\"${SUBPROJECT:-}\"" >> config/chroot
echo "LB_DISTRIBUTION=\"$SUITE\"" >> config/chroot
echo "IMAGEFORMAT=\"$IMAGEFORMAT\"" >> config/chroot
if [ -n "$PASSES" ]; then
	echo "PASSES=\"$PASSES\"" >> config/common
fi
if [ -n "$LIVE_PASSES" ]; then
	echo "LIVE_PASSES=\"$LIVE_PASSES\"" >> config/common
fi
echo "LB_BINARY_HOOKS=\"$BINARY_HOOKS\"" >> config/binary
echo "BUILDSTAMP=\"$NOW\"" >> config/binary
echo "SUBPROJECT=\"${SUBPROJECT:-}\"" >> config/binary
echo "LB_DISTRIBUTION=\"$SUITE\"" >> config/binary

case $PROJECT in
  ubuntu-cpc|ubuntu-core|ubuntu-base|base)
    # ubuntu-cpc gets this added in 025-create-groups.chroot, and we do
    # not want this group in projects that are effectively just chroots
    ;;
  *)
    # We add the lxd group at image build time so that the default user
    # created by the installer or cloud-init is added to it (cloud-init
    # will create any group the user is configured to be added to, but as
    # a normal group not a system group, see
    # https://bugs.launchpad.net/cloud-images/+bug/1844498).
    cat > config/hooks/100-add-lxd-group.chroot <<EOF
#!/bin/bash

echo "Adding lxd group..."
addgroup --system --quiet lxd
EOF
    ;;
esac

case $ARCH+$SUBARCH in
	armhf+raspi2|armhf+raspi|arm64+raspi)
		cat > config/hooks/01-firmware-directory.chroot_early <<EOF
#!/bin/sh -ex
mkdir -p /boot/firmware
EOF
		cat > config/hooks/999-raspi2-fixes.chroot <<EOF
#!/bin/sh -ex
cat >> /etc/fstab << EOM
LABEL=system-boot       /boot/firmware  vfat    defaults        0       1
EOM

cat > /boot/firmware/cmdline.txt << EOM
net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
EOM

cat > /boot/firmware/config.txt << EOM
# For more options and information see 
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details

kernel=uboot.bin
device_tree_address=0x02000000

# enable i2c
dtparam=i2c_arm=on
dtparam=spi=on

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

EOM
EOF
		;;
	*)
		;;
esac

if [ $PROJECT = ubuntu-server ] && [ "${SUBPROJECT:-}" != live ]; then
	cat > config/hooks/100-remove-fstab.chroot <<EOF
#! /bin/sh
rm -f /etc/fstab
EOF
fi

if [ $PROJECT != ubuntu-cpc ]; then
	cat > config/hooks/100-preserve-apt-prefs.chroot <<\EOF
#! /bin/sh -ex

# live-build "helpfully" removes /etc/apt/preferences.d/* so we put a
# copy somewhere it won't touch it.

if [ -n "$(ls -A /etc/apt/preferences.d)" ]; then
    cp -a /etc/apt/preferences.d /etc/apt/preferences.d.save
fi
EOF
fi

if [ $PROJECT = ubuntukylin ]; then
	cat > config/hooks/100-ubuntukylin.chroot <<EOF
#! /bin/sh
set -e
HOOK=/usr/share/ubuntukylin-default-settings/hooks/chroot
if [ -x \$HOOK ]; then
	exec \$HOOK
fi
exit 0
EOF
fi

if $BINARY_REMOVE_LINUX; then
	cat > config/binary_rootfs/excludes << EOF
boot/vmlinu?-*
boot/initrd.img-*
EOF
fi

if [ "$PROPOSED" ]; then
	. config/bootstrap

	cat > config/archives/proposed.list.chroot << EOF
deb $LB_PARENT_MIRROR_BINARY_VOLATILE $SUITE-proposed $LB_PARENT_ARCHIVE_AREAS
EOF
	cp -a config/archives/proposed.list.chroot \
	      config/archives/proposed.list.binary
fi

case $PROJECT:${SUBPROJECT:-} in
	*-dvd:*)
		. config/bootstrap

		cat > config/archives/dvd.list.binary << EOF
deb $LB_PARENT_MIRROR_BINARY $SUITE universe multiverse
deb $LB_PARENT_MIRROR_BINARY_VOLATILE $SUITE-updates universe multiverse
deb $LB_PARENT_MIRROR_BINARY_SECURITY $SUITE-security universe multiverse
EOF
		if [ "$PROPOSED" ]; then
			cat >> config/archives/dvd.list.binary << EOF
deb $LB_PARENT_MIRROR_BINARY_VOLATILE $SUITE-proposed universe multiverse
EOF
		fi
		;;

	ubuntu-core:system-image|ubuntu-cpc:*|ubuntu-server:live|ubuntu:desktop-preinstalled)
		# Ensure that most things e.g. includes.chroot are copied as is
		for entry in /usr/share/livecd-rootfs/live-build/${PROJECT}/*; do
			case $entry in
				*hooks*)
					# But hooks are shared across the projects with symlinks
					# dereference them
					cp -afL $entry config/
					;;
				*)
					# Most places want to preserve symlinks as is
					cp -af $entry config/
					;;
			esac
		done

		if [ "$PROJECT" = "ubuntu-cpc" ]; then
			case ${IMAGE_TARGETS:-} in
				"")
					config/hooks.d/make-hooks --hooks-dir config/hooks all
					;;
				*)
					config/hooks.d/make-hooks --hooks-dir config/hooks \
						"$IMAGE_TARGETS"
					;;
			esac
		fi

		if [ "$IMAGEFORMAT" = none ]; then
			rm -f config/hooks/*.binary*
		fi
		;;
esac

case $SUBPROJECT in
	buildd)
		cp -af /usr/share/livecd-rootfs/live-build/buildd/* config/

		# Disable merged /usr to avoid building packages with
		# hardcoded paths that assume it.
		echo 'DEBOOTSTRAP_OPTIONS="$DEBOOTSTRAP_OPTIONS --no-merged-usr"' \
			>> config/common
		;;
esac

if [ "$EXTRA_PPAS" ]; then
	rm -f config/archives/extra-ppas.list.chroot \
	      config/archives/extra-ppas.pref.chroot \
	      config/archives/extra-ppas.key.chroot
	gpg_tmpdir="$(mktemp -d)"
	run_gpg () {
		gpg --no-default-keyring --no-options --homedir "$gpg_tmpdir" \
			--secret-keyring "$gpg_tmpdir/secring.gpg" \
			--keyserver hkp://keyserver.ubuntu.com:80/ \
			"$@"
	}
	for extra_ppa in $EXTRA_PPAS; do
		extra_ppa_pin=''
		extra_ppa_origin=''
		case $extra_ppa in
		    *:*)
			extra_ppa_pin=${extra_ppa#*:}
			extra_ppa=${extra_ppa%:*}
			;;
		esac
		extra_ppa_fingerprint="$(/usr/share/livecd-rootfs/get-ppa-fingerprint "$extra_ppa")"

		cat >> config/archives/extra-ppas.list.chroot <<EOF
deb http://ppa.launchpad.net/$extra_ppa/ubuntu @DISTRIBUTION@ main
deb-src http://ppa.launchpad.net/$extra_ppa/ubuntu @DISTRIBUTION@ main
EOF

		if [ -n "$extra_ppa_pin" ]; then
		    extra_ppa_origin="LP-PPA-$(echo $extra_ppa | sed -e 's,/ppa$,,' -e 's,/,-,')"
		    echo "Package: *" >> config/archives/extra-ppas.pref.chroot
		    echo "Pin: release o=$extra_ppa_origin" >> config/archives/extra-ppas.pref.chroot
		    echo "Pin-Priority: $extra_ppa_pin" >> config/archives/extra-ppas.pref.chroot
		    echo "" >> config/archives/extra-ppas.pref.chroot
		fi
		run_gpg --keyring "$gpg_tmpdir/pubring.gpg" \
			--recv "$extra_ppa_fingerprint"
		run_gpg --keyring "$gpg_tmpdir/pubring.gpg" \
			--output "$gpg_tmpdir/export.gpg" \
			--export "$extra_ppa_fingerprint"
		got_fingerprint="$(
			run_gpg --keyring "$gpg_tmpdir/export.gpg" \
				--fingerprint --batch --with-colons |
			grep '^fpr:' | cut -d: -f10)"
		if [ "$got_fingerprint" != "$extra_ppa_fingerprint" ]; then
			echo "Fingerprints do not match.  Got:" >&2
			echo "$got_fingerprint" | sed 's/^/  /' >&2
			echo "Expected:" >&2
			echo "  $extra_ppa_fingerprint" >&2
			exit 1
		fi
		cat "$gpg_tmpdir/export.gpg" >> config/archives/extra-ppas.key.chroot
		rm -f "$gpg_tmpdir/export.gpg"
	done
	rm -rf "$gpg_tmpdir"
	cp -a config/archives/extra-ppas.list.chroot \
	      config/archives/extra-ppas.list.binary
	cp -a config/archives/extra-ppas.key.chroot \
	      config/archives/extra-ppas.key.binary
	if [ -f config/archives/extra-ppas.pref.chroot ]; then
		cp -a config/archives/extra-ppas.pref.chroot \
		      config/archives/extra-ppas.pref.binary
	fi
fi

if [ "$PREINSTALLED" = "true" ]; then
	if [ -n "$PREINSTALL_POOL_SEEDS" ]; then
		UNWANTED_SEEDS="${LIVE_TASK:+$LIVE_TASK }boot installer required"
		for i in $UNWANTED_SEEDS; do
			UNWANTED_SEEDS="${UNWANTED_SEEDS:+$UNWANTED_SEEDS }$(inheritance $i)"
		done

		for i in $PREINSTALL_POOL_SEEDS; do
			PREINSTALL_POOL_SEEDS="${PREINSTALL_POOL_SEEDS:+$PREINSTALL_POOL_SEEDS }$(inheritance $i)"
		done

		for i in $PREINSTALL_POOL_SEEDS; do
			case " $UNWANTED_SEEDS " in
				*" $i "*)
					;;
				*)
					PPS_EXP="${PPS_EXP:+$PPS_EXP }$i"
					;;
			esac
		done

		for i in $PPS_EXP; do
			PREINSTALL_POOL="$PREINSTALL_POOL $(awk '{print $1}' \
			config/germinate-output/$i | egrep -v '^-|^Package|^\|' | tr '\n' ' ')"
		done
	fi
	if [ -n "$PREINSTALL_POOL" ]; then
		mkdir -p config/gnupg
		mkdir -p config/indices
		for component in $COMPONENTS; do
			(cd config/indices && \
		 	 wget $MIRROR/indices/override.$SUITE.$component && \
			 wget $MIRROR/indices/override.$SUITE.extra.$component \
			)
		done
		cat > config/hooks/100-preinstall-pool.chroot <<EOF
#! /bin/sh
mkdir -p /var/lib/preinstalled-pool/pool/
cd /var/lib/preinstalled-pool/pool/
apt-get -y download $PREINSTALL_POOL
EOF
	fi
fi