Adding support for zsync control files generation, thanks to Hector Oron <hector.oron@gmail.com> for the idea and prototype.

functions/defaults.sh

@@ -943,6 +943,9 @@ Set_defaults ()
 			;;
 	esac
 
+	# Setting zsync
+	LB_ZSYNC="${LB_ZSYNC:-true}"
+
 	# Setting chroot option
 	LB_BUILD_WITH_CHROOT="${LB_BUILD_WITH_CHROOT:-true}"
 

scripts/build/lb_binary

@@ -89,6 +89,8 @@ lb binary_tar ${*}
 lb binary_hdd ${*}
 lb binary_virtual-hdd ${*}
 
+lb binary_zsync ${*}
+
 if [ "${LB_BUILD_WITH_CHROOT}" = "true" ]
 then
 	# Deconfiguring chroot

scripts/build/lb_binary_zsync

@@ -0,0 +1,121 @@
+#!/bin/sh
+
+## live-build(7) - System Build Scripts
+## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
+##
+## live-build 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
+. "${LB_BASE:-/usr/share/live/build}"/scripts/build.sh
+
+# Setting static variables
+DESCRIPTION="$(Echo 'build zsync control files')"
+HELP=""
+USAGE="${PROGRAM} [--force]"
+
+Arguments "${@}"
+
+# Reading configuration files
+Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
+Set_defaults
+
+if [ "${LB_ZSYNC}" != "true" ]
+then
+	exit 0
+fi
+
+Echo_message "Begin building zsync control files..."
+
+# Requiring stage file
+Require_stagefile .build/config .build/bootstrap
+
+# Checking stage file
+Check_stagefile .build/binary_zsync
+
+# Checking lock file
+Check_lockfile .lock
+
+# Creating lock file
+Create_lockfile .lock
+
+# Checking depends
+Check_package chroot/usr/bin/zsyncmake zsync
+
+# Restoring cache
+Restore_cache cache/packages.binary
+
+# Installing depends
+Install_package
+
+case "${LB_BINARY_IMAGES}" in
+	iso)
+		_IMAGES="binary.iso"
+		;;
+
+	iso-hybrid)
+		_IMAGES="binary.hybrid.iso"
+		;;
+
+	hdd)
+		_IMAGES="binary.img"
+		;;
+
+	net)
+		_IMAGES="binary.netboot.tar*"
+		;;
+
+	tar)
+		_IMAGES="binary.tar*"
+		;;
+esac
+
+for _IMAGE in ${_IMAGES}
+do
+	if [ -e "${_IMAGE}" ]
+	then
+		case "${LB_BUILD_WITH_CHROOT}" in
+			true)
+				mv ${_IMAGE} chroot
+				Chroot chroot "zsyncmake -C -b 2048 -u ${_IMAGE} ${_IMAGE}"
+				mv chroot/${_IMAGE} chroot/${_IMAGE}.zsync ./
+				;;
+
+			false)
+				zsyncmake -C -b 2048 -u "${_IMAGE}" "${_IMAGE}"
+				;;
+		esac
+
+		case "${LB_COMPRESSION}" in
+			bzip2)
+				bzip2 ${BZIP2_OPTIONS} ${_IMAGE}.zsync
+				;;
+
+			gzip)
+				gzip ${GZIP_OPTIONS} ${_IMAGE}.zsync
+				;;
+
+			lzip)
+				lzip ${LZIP_OPTIONS} ${_IMAGE}.zsync
+				;;
+
+			none)
+				;;
+		esac
+	fi
+done
+
+#CHECKSUMS
+
+# Saving cache
+Save_cache cache/packages.binary
+
+# Removing depends
+Remove_package
+
+# Creating stage file
+Create_stagefile .build/binary_zsync

scripts/build/lb_config

@@ -55,6 +55,7 @@ USAGE="${PROGRAM}   [--apt apt|aptitude]\n\
 \t    [--cache-stages STAGE|\"STAGES\"]\n\
 \t    [--checksums md5|sha1|sha256|none]\n\
 \t    [--compression bzip2|gzip|lzip|none]\n\
+\t    [--zsync true|false]\n\
 \t    [--build-with-chroot true|false]\n\
 \t    [--chroot-filesystem ext2|ext3|ext4|squashfs|jffs2|none]\n\
 \t    [--clean\n\
@@ -167,7 +168,7 @@ Local_arguments ()
 		archives:,archive-areas:,parent-archive-areas:,chroot-filesystem:,exposed-root:,
 		gzip-options:,hooks:,interactive:,keyring-packages:,linux-flavours:,linux-packages:,
 		package-lists:,security:,volatile:,backports:,binary-filesystem:,binary-images:,
-		apt-indices:,bootappend-install:,bootappend-live:,bootappend-failsafe:,bootloader:,checksums:,compression:,build-with-chroot:,
+		apt-indices:,bootappend-install:,bootappend-live:,bootappend-failsafe:,bootloader:,checksums:,compression:,zsync:,build-with-chroot:,
 		debian-installer:,debian-installer-distribution:,debian-installer-preseedfile:,debian-installer-gui:,
 		grub-splash:,isohybrid-options:,hdd-label:,hdd-size:,iso-application:,iso-preparer:,iso-publisher:,
 		iso-volume:,jffs2-eraseblock:,memtest:,net-root-filesystem:,net-root-mountoptions:,
@@ -631,6 +632,11 @@ Local_arguments ()
 				shift 2
 				;;
 
+			--zsync)
+				LB_ZSYNC="${2}"
+				shift 2
+				;;
+
 			--build-with-chroot)
 				LB_BUILD_WITH_CHROOT="${2}"
 				shift 2
@@ -1318,6 +1324,10 @@ LB_CHECKSUMS="${LB_CHECKSUMS}"
 # (Default: ${LB_COMPRESSION})
 LB_COMPRESSION="${LB_COMPRESSION}"
 
+# \$LB_ZSYNC: set zsync
+# (Default: ${LB_ZSYNC})
+LB_ZSYNC="${LB_ZSYNC}"
+
 # \${LB_BUILD_WITH_CHROOT: control if we build binary images chrooted
 # (Default: ${LB_BUILD_WITH_CHROOT})
 # DO NEVER, *NEVER*, *N*E*V*E*R* SET THIS OPTION to false.