#! /bin/sh
set -e

rm -rf config

echo "Building on $(hostname --fqdn)"
SUITENUM=$(distro-info --series="$SUITE" -r | awk '{ print $1 }')
HWE_SUFFIX="hwe-${SUITENUM}"

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|lp-*)		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/snap-seed-parse.py config/snap-seed-parse

mkdir -p config/package-lists

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

	# 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.

	for task; do
		if [ "$task" = "ubuntu-budgie-desktop" ]; then
			filter="| grep -v '^linux.*tools'"
		else
			filter=""
		fi
		if [ -n "$HWE" ]; then
			# If HWE is set, we strip out drivers not available in the
			# HWE stack, then sed the rest with their HWE suffixes:
			filter="$filter | sed -e 's/xserver-xorg.*/&-${HWE_SUFFIX}/'"
		fi
		# 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 $filter" >> "config/package-lists/livecd-rootfs.list.chroot_$pass"
	done
}

add_package ()
{
	local pass="$1"
	shift
	local pkg

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

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 "

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

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

if [ -z "${IMAGEFORMAT:-}" ]; then
	case $PROJECT:${SUBPROJECT:-} in
		ubuntu-cpc:*|ubuntu:desktop-preinstalled)
			if [ "$SUBARCH" = "raspi3" ]; then
				# For now only raspi3, but others are soon to follow
				IMAGEFORMAT=ubuntu-image
			else
				IMAGEFORMAT=ext4
			fi
			;;
		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
		case ${SUBPROJECT:-} in
			wubi)
				add_package install lupin-support
				COMPONENTS='main restricted universe multiverse'
				;;
			*)
				case $PROJECT:${SUBPROJECT:-} in
					ubuntu-base:buildd)
						;;
					ubuntu-cpc:*)
						;;
					*)
						add_package live jasper
						;;
				esac
				;;
		esac
		;;

	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=""
		BRAND_ID="canonical"

		case "$ARCH+${SUBARCH:-}" in
			# Handle appliance images
			*+appliance-*)
				BRAND_ID="ubuntu"
				MODEL="${SUBARCH#appliance-}"
				APPLIANCE=1
				;;
			amd64+*)
				MODEL=pc-amd64 ;;
			i386+*)
				MODEL=pc-i386 ;;
			arm64+snapdragon)
				MODEL=dragonboard ;;
			armhf+raspi3)
				MODEL=pi ;;
			arm64+raspi3)
				MODEL=pi-arm64 ;;
			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

			case $MODEL in
				pc-amd64|pc-i386)
					[ -z "${SUBARCH:-}" ] \
					&& UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS --image-size 3700M"
					;;
				# Some appliances need different snap tracks
				lxd-core18*)
					EXTRA_SNAPS="lxd=4.0"
					;;
			esac
			case $SUITE in
				xenial)
					# Ubuntu Core 16
					;;
				*)
					# Ubuntu Core 18
					[ -z "${APPLIANCE:-}" ] \
					&& MODEL="ubuntu-core-18-${MODEL#pc-}"
					;;
			esac

			case "$ARCH+${SUBARCH:-}" in
				amd64+kassel)
					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="$BRAND_ID" > "$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
			case $MODEL in
				pi-arm64|pi)
					# XXX: Temporarily this is still built from the pi3 tree,
					#  but eventually we'll use the pi one.
					MODEL=pi3 ;;
			esac

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

			git clone git://git.launchpad.net/~canonical-foundations/snap-$MODEL/+git/github-mirror -b classic config/$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
		# Fake finished configuration for lb build
		mkdir -p .build
		touch .build/config
		exit 0
		;;

	none)
		OPTS="${OPTS:+$OPTS }--chroot-filesystem $IMAGEFORMAT"
		;;
	*)
		case $PROJECT in
			ubuntu-server|ubuntu-touch|ubuntu-touch-custom)
				;;
			*)
				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 $PROJECT in
		kubuntu*)
			add_package live oem-config-kde ubiquity-frontend-kde
			add_package live ubiquity-slideshow-kubuntu
			;;
		lubuntu*)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-lubuntu
			;;
		xubuntu*)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-xubuntu
			;;
		ubuntu-mate)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-ubuntu-mate
			;;
		ubuntu-server)
			add_package live oem-config-debconf ubiquity-frontend-debconf
			;;
		ubuntu-core|ubuntu-base|base|ubuntu-touch|ubuntu-touch-custom|ubuntu-cpc|ubuntu-desktop-next)
			;;
		ubuntu)
			add_package live oem-config-gtk ubiquity-frontend-gtk
			add_package live ubiquity-slideshow-ubuntu
			if [ "$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

# cribbed from cdimage, perhaps this should be a small helper script in germinate?
add_inheritance () {
	case " $inherit " in
		*" $1 "*)
			;;
		*)
			inherit="${inherit:+$inherit }$1"
			;;
	esac
}

expand_inheritance () {
	for seed in $(grep "^$1:" config/germinate-output/structure | cut -d: -f2); do
		expand_inheritance "$seed"
	done
	add_inheritance "$1"
}

inheritance () {
	inherit=
	expand_inheritance "$1"
	echo "$inherit"
}

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
        base|edubuntu|edubuntu-dvd|kubuntu|kubuntu-active|kubuntu-dvd|kubuntu-plasma5|lubuntu|lubuntu-next|mythbuntu|ubuntu|ubuntu-budgie|ubuntu-desktop-next|ubuntu-dvd|ubuntu-gnome|ubuntu-mate|ubuntu-netbook|ubuntukylin|ubuntustudio-dvd|xubuntu)
		INITRAMFS_COMPRESSION="lzma"
		;;
esac

case $PROJECT in
	ubuntu|ubuntu-dvd)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntu-desktop
		LIVE_TASK='ubuntu-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		;;

	ubuntu-desktop-next)
		add_task install minimal standard ubuntu-desktop-next ubuntu-sdk-libs
		COMPONENTS='main restricted universe'
		LIVE_TASK='ubuntu-touch-live'
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac

		# system image snappy desktop next image
		# mvo: This is for cron.daily-preinstalled
		#      CDIMAGE_PREINSTALLED is not passed from build.py
		#      and PREINSTALLED means something different. So
		#      we use SUBPROJECT to pass on the information
		if [ "${SUBPROJECT:-}" = "system-image" ]; then
			OPTS="${OPTS:+$OPTS }--linux-packages=linux-image"
		fi
		;;

	kubuntu|kubuntu-dvd)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard
		add_task install kubuntu-desktop
		LIVE_TASK='kubuntu-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		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)
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntu-desktop edubuntu-desktop-gnome
		LIVE_TASK='edubuntu-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe'
		;;

	xubuntu)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard xubuntu-desktop
		add_package install xterm
		LIVE_TASK='xubuntu-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe multiverse'
		;;

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

	mythbuntu)
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard mythbuntu-desktop
		LIVE_TASK='mythbuntu-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe multiverse'
		;;

	lubuntu)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard lubuntu-gtk-core lubuntu-desktop
		# Installing the lubuntu-gtk-core task explicitly appears
		# to make dbus-user-session not get installed anymore:
		add_package install dbus-user-session
		# These themes also get dropped, maybe worth looking closer:
		add_package install humanity-icon-theme gnome-icon-theme adwaita-icon-theme
		LIVE_TASK='lubuntu-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe multiverse'

		# The Lubuntu STRUCTURE file has "feature
		# no-follow-recommends".  Mirror this.
		APT_OPTIONS="${APT_OPTIONS} --no-install-recommends"
		;;

	lubuntu-next)
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard lubuntu-qt-desktop
		LIVE_TASK='lubuntu-live-qt'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe multiverse'

		# The Lubuntu STRUCTURE file has "feature
		# no-follow-recommends". Mirror this.
		APT_OPTIONS="${APT_OPTIONS} --no-install-recommends"
		;;

	ubuntu-gnome)
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntu-gnome-desktop
		LIVE_TASK='ubuntu-gnome-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe'
		;;

	ubuntu-budgie)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntu-budgie-desktop
		LIVE_TASK='ubuntu-budgie-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe'
		;;

	ubuntu-mate)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntu-mate-core ubuntu-mate-desktop
		LIVE_TASK='ubuntu-mate-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		COMPONENTS='main restricted universe multiverse'
		;;

	ubuntustudio-dvd)
		KERNEL_FLAVOURS="lowlatency${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntustudio-desktop ubuntustudio-audio ubuntustudio-fonts ubuntustudio-graphics ubuntustudio-video ubuntustudio-publishing ubuntustudio-photography
		COMPONENTS='main restricted universe multiverse'
		;;

	ubuntukylin)
		HWE="yes"
		KERNEL_FLAVOURS="generic${HWE:+-$HWE_SUFFIX}"
		add_task install minimal standard ubuntukylin-desktop
		add_package install ubuntukylin-default-settings
		LIVE_TASK='ubuntukylin-live'
		case $ARCH in
			amd64)	add_package live linux-signed-$KERNEL_FLAVOURS ;;
		esac
		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 $ARCH in
			i386)
				add_package install grub-pc
				;;
			amd64)
				add_package install grub-pc
				add_package install shim-signed
				;;
		esac
		OPTS="${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-touch|ubuntu-touch-custom)
		HINTS="packagekit ubuntu-system-settings"
		case $ARCH in
		    amd64|i386)
			HINTS="$HINTS qml-module-ubuntu-components-gles unity8"
			;;
		esac
		add_package install ubuntu-minimal ubuntu-touch $HINTS

		COMPONENTS='main restricted universe'
		BOOTAPPEND_LIVE='hostname=ubuntu-phablet username=ubuntu'
		export LB_BOOTSTRAP_INCLUDE='apt-transport-https gnupg'
		OPTS="${OPTS:+$OPTS }--apt-recommends false"
		OPTS="${OPTS:+$OPTS }--compression gzip"
		OPTS="${OPTS:+$OPTS }--system normal"
		OPTS="${OPTS:+$OPTS }--zsync false"

		# TODO cjwatson 2014-07-17: This is a bit of an abuse of
		# SUBPROJECT, but it's a handy thing that launchpad-buildd
		# already passes through to us that we weren't otherwise
		# using here.
		case ${SUBPROJECT:-} in
		    ubuntu-rtm/dogfood)
			MIRROR=http://derived-archive.dogfood.content.paddev.net/ubuntu-rtm/
			OPTS="${OPTS:+$OPTS }--apt-secure false"
			OPTS="${OPTS:+$OPTS }--mirror-chroot-security ${MIRROR}"
			OPTS="${OPTS:+$OPTS }--mirror-binary-security ${MIRROR}"
			OPTS="${OPTS:+$OPTS }--mirror-binary ${MIRROR}"
			;;
		    ubuntu-rtm)
			MIRROR=http://derived.archive.canonical.com/ubuntu-rtm/
			OPTS="${OPTS:+$OPTS }--mirror-chroot-security ${MIRROR}"
			OPTS="${OPTS:+$OPTS }--mirror-binary-security ${MIRROR}"
			OPTS="${OPTS:+$OPTS }--mirror-binary ${MIRROR}"
			;;
		esac
		;;

	ubuntu-cpc)
		if [ "${SUBPROJECT:-}" = minimized ]; then
			add_task install cloud-image
			add_package install sudo
			# linux-kvm currently only exists in xenial, not in
			# non-LTS suites.  Fall back to virtual flavor, which
			# may or may not boot initramfsless but enables us to
			# test building and possibly build derivative images
			# using other kernel flavors.
			# If you enable an extra ppa, it is assumed that
			# linux-kvm is available since you control the
			# archive and can provide this metapackage as
			# necessary.
			if [ "$ARCH" = "amd64" ] && ([ -n "$EXTRA_PPAS" ] || [ "$SUITE" = xenial ] || [ "$SUITE" = bionic ]); 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 tzdata
		add_package install fakeroot
		add_package install build-essential
		# Needed for LXD-based builds.
		add_package install init

		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*:*|xubuntu*:*|ubuntu-mate*:*|ubuntustudio*:*|ubuntukylin*:*|ubuntu-budgie*:*)
		BASE_SEED='desktop'
		;;
	lubuntu-next:*)
		BASE_SEED='desktop-qt'
		;;
	lubuntu:*)
		BASE_SEED='desktop-gtk'
		;;
	ubuntu-server:live)
		BASE_SEED='server'
		# subiquity is seeded but in a separate squashfs via hooks; set HOOK_SNAPS and ALL_SNAPS.
		HOOK_SNAPS='subiquity'
		ALL_SNAPS=''
		;;
esac

if [ -n "${BASE_SEED}" ]; then
	SEEDS_EXPANDED=$(inheritance ${BASE_SEED})
	for seed in ${SEEDS_EXPANDED}; do
		echo "snap: considering ${seed}"
		file=config/germinate-output/${seed}.snaps
		[ -e "${file}" ] || continue
		# extract the first column (snap package name) from germinate's output
		# translate the human-readable "foo (classic)" into a
		# more machine readable "foo/classic"
		seed_snaps=$(sed -rn '1,/-----/d;/-----/,$d; s/(.*) \|.*/\1/; s, \(classic\),/classic,; p' "${file}")
		for snap in ${seed_snaps}; do
			echo "snap: found ${snap}"
			# Reorder gtk-common-themes first due to LP: #1772844
			if [ "${snap}" = "gtk-common-themes" ]; then
				ALL_SNAPS="${snap}${ALL_SNAPS:+ ${ALL_SNAPS}}"
			else
				ALL_SNAPS="${ALL_SNAPS:+${ALL_SNAPS} }${snap}"
			fi
		done
	done
	if [ -n "${ALL_SNAPS}" ] || [ -n "${HOOK_SNAPS}" ]; then
		echo "${ALL_SNAPS}" > config/seeded-snaps
	fi
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 [ "$PREINSTALLED" != "true" ] && [ "$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 $ARCH in
	armel|armhf|arm64)
		KERNEL_FLAVOURS="${SUBARCH:-$KERNEL_FLAVOURS}"
		case $SUBARCH in
			dove)
				BINARY_REMOVE_LINUX=false
				;;
			omap)
				add_package install u-boot-linaro-omap3-beagle u-boot-tools
				BINARY_REMOVE_LINUX=false
				;;
			omap4)
				case $PROJECT in
					ubuntu-server|ubuntu-core|base)
						add_package install u-boot-linaro-omap4-panda u-boot-tools
						;;
					*)
						add_package install u-boot-linaro-omap4-panda u-boot-tools pvr-omap4
						;;
				esac
				BINARY_REMOVE_LINUX=false
				;;
			mx5)
				COMPONENTS='main restricted universe'
				KERNEL_FLAVOURS=linaro-lt-mx5
				add_package install flash-kernel u-boot-linaro-mx53loco u-boot-tools
				BINARY_REMOVE_LINUX=false
				;;
			ac100)
				COMPONENTS='main restricted universe multiverse'
				add_package install zram-config abootimg
				add_package live ac100-tarball-installer
				BINARY_REMOVE_LINUX=false
				;;
			raspi2)
				COMPONENTS='main restricted universe multiverse'
				add_package install linux-firmware-raspi2 u-boot-rpi flash-kernel u-boot-tools wpasupplicant
				BINARY_REMOVE_LINUX=false
				;;
			raspi3)
				COMPONENTS='main restricted universe multiverse'
				KERNEL_FLAVOURS=raspi-hwe-18.04
				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:*|ubuntu-touch:*|ubuntu-touch-custom:*)
		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

case ${SUBPROJECT:-} in
	wubi)
		add_binary_hook build-wubildr
		;;
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"} \
	$OPTS \
	"$@"

echo "LB_CHROOT_HOOKS=\"$CHROOT_HOOKS\"" >> config/chroot
echo "SUBPROJECT=\"${SUBPROJECT:-}\"" >> config/chroot
echo "LB_DISTRIBUTION=\"$SUITE\"" >> config/chroot
echo "LB_BINARY_HOOKS=\"$BINARY_HOOKS\"" >> config/binary
echo "BUILDSTAMP=\"$NOW\"" >> config/binary
echo "SUBPROJECT=\"${SUBPROJECT:-}\"" >> config/binary
echo "LB_DISTRIBUTION=\"$SUITE\"" >> config/binary
echo "IMAGEFORMAT=\"$IMAGEFORMAT\"" >> config/chroot
echo "SUBARCH=\"$SUBARCH\"" >> config/chroot

case $ARCH+$SUBARCH in
	armhf+raspi2|armhf+raspi3|arm64+raspi3)
		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-touch:*|ubuntu-touch-custom:*|ubuntu-core:system-image|ubuntu-desktop-next: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/
		;;
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

case ${SUBPROJECT:-} in
    ubuntu-rtm|ubuntu-rtm/*)
	# debootstrap doesn't know about ubuntu-rtm series directly.  Rather
	# than having to teach it, we employ a few hacks to make it use the
	# Ubuntu script instead.
	mkdir -p config/fake_debootstrap_dir/scripts
	ln -s /usr/share/debootstrap/devices.tar.gz \
		config/fake_debootstrap_dir/
	ln -s /usr/share/debootstrap/functions config/fake_debootstrap_dir/
	ln -s /usr/share/debootstrap/scripts/gutsy \
		"config/fake_debootstrap_dir/scripts/$SUITE"
	echo 'export DEBOOTSTRAP_DIR="$PWD/config/fake_debootstrap_dir"' \
		>> config/bootstrap
	;;
esac

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