livecd-rootfs/live-build/lb_binary_layered

#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


set -e

# Including common functions
( . "${LIVE_BUILD}/scripts/build.sh" > /dev/null 2>&1 || true ) || . /usr/lib/live/build.sh


# Automatically populating config tree
if [ -x auto/config ] && [ ! -e .build/config ]
then
	Echo_message "Automatically populating config tree."
	lb config
fi

# Setting static variables
DESCRIPTION="$(Echo 'build binary images')"
HELP=""
USAGE="${PROGRAM} [--force]"

Arguments "${@}"

# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
Set_defaults

# Setup cleanup function
Setup_cleanup

. config/functions

lb_binary_includes () {
	# Copying includes from pass subdirectory
	local pass="$1"

	if [ ! -d config/includes.binary.${pass} ]; then
		return
	fi

	cd config/includes.binary.${pass}
	find . | cpio -dmpu --no-preserve-owner "${OLDPWD}"/chroot
	cd "${OLDPWD}"
}

build_layered_squashfs () {
	local pass=$1
	shift 1 # restore ${*}

	Echo_message "lb_binary_layered: treating pass $pass"

	# Building squashfs filesystem & manifest
	local overlay_dir="overlay.${pass}"
	base="${PWD}/livecd.${PROJECT}.${pass}"
	squashfs_f="${base}.squashfs"

	# We have already treated that pass
	if [ -f "${squashfs_f}" ]; then
		return
	fi

	rm -f .build/binary_chroot

	mkdir -p "$overlay_dir/"
	lowerdirs=$(get_lowerdirs_for_pass $pass)
	if [ -n "$lowerdirs" ]; then
		mkdir -p chroot/
		mount_overlay "$lowerdirs" "$overlay_dir" chroot/
	else
		ln -s "$overlay_dir/" chroot
	fi

	export PASS=${pass}
	setenv_file PASS "${pass}" config/environment.chroot

	# Cleanup root filesystem
	lb binary_chroot ${*}

	lb_binary_includes $pass ${*}
	lb binary_hooks ${*}

	# Copy initrd and vmlinuz outside of chroot and remove them from the layer squashfs
	if $(is_live_layer "$pass"); then
		lb binary_linux-image ${*}
		rm -f chroot/boot/initrd.img-* chroot/boot/vmlinu{x,z}-*
	fi

	# Full manifest until that PASS
	squashfs_f_manifest="${base}.manifest"
	create_manifest "chroot" "${squashfs_f_manifest}.full"

	# Delta manifest
	diff -NU0 ${PWD}/livecd.${PROJECT}.$(get_parent_pass $pass).manifest.full ${squashfs_f_manifest}.full|grep -v ^@ > $squashfs_f_manifest

	squashfs_f_size="${base}.size"
	du -B 1 -s "overlay.${pass}/" | cut -f1 > "${squashfs_f_size}"

	# We take first live pass for "global" ISO properties (used by installers and checkers):
	# Prepare initrd + kernel
	# Main manifest and size files
	prefix="livecd.$PROJECT${SUBARCH:+-$SUBARCH}"
	if [ ! -e "${prefix}.manifest" ] && $(is_live_layer "$pass"); then
		totalsize=$(cat ${squashfs_f_size})
		curpass="$pass"
		while :; do
			curpass=$(get_parent_pass $curpass)
			# We climbed up the tree to the root layer, we are done
			[ -z "$curpass" ] && break

			totalsize=$(expr $totalsize + $(cat "${PWD}/livecd.${PROJECT}.${curpass}.size"))
		done
		echo ${totalsize} > "${prefix}.size"

		cp "${squashfs_f_manifest}.full" "${prefix}.manifest"
	fi

	(cd "overlay.${pass}/" &&
		mksquashfs . ${squashfs_f} \
		-no-progress -xattrs -comp xz )

	if [ -n "$lowerdirs" ]; then
		umount chroot
		rmdir chroot
	else
		rm chroot
	fi
}

for _PASS in $PASSES
do
	build_layered_squashfs "${_PASS}" ${*}
done

# Ubiquity-compatible removal manifest for ISO not using a layered-aware installer
if [ -n "$(ls livecd.${PROJECT}.*install.live.manifest.full 2>/dev/null)" ] && \
   [ -n "$(ls livecd.${PROJECT}.*install.manifest.full 2>/dev/null)" ]; then
	echo "$(diff livecd.${PROJECT}.*install.live.manifest.full livecd.${PROJECT}.*install.manifest.full | awk '/^< / { print $2 }')" > livecd.${PROJECT}-manifest-remove
fi

chmod 644 *.squashfs *.manifest* *.size