use local scope for private function vars

all vars affected have been carefully checked to be quite certain
that they are definitely local

where variable is assigned the return value of a function/command, the
local "declaration" is deliberately done on a separate line, since
`local FOO` is actually treated itself as a command rather than a
declaration; will thus always cause $? to be zero, and thus if done on
the same line as such an assignment can not only clobber $? but in doing
so unintentionally blocks failure of a command from triggering the
expected exit from having `set -e`.

also, from testing, i have found that when assigning "${@}" this must be
done on a separate line confusingly as otherwise an error occurs.

Gbp-Dch: Short

23 files changed, 141 insertions, 84 deletions

diff --git a/functions/aliases.sh b/functions/aliases.sh
index c4fb634e2..bf77e4284 100755
--- a/functions/aliases.sh
+++ b/functions/aliases.sh
@@ -19,6 +19,7 @@ In_list ()
 	local NEEDLE="${1}"
 	shift
 
+	local ITEM
 	for ITEM in ${@}
 	do
 		if [ "${NEEDLE}" = "${ITEM}" ]
@@ -32,6 +33,7 @@ In_list ()
 
 Truncate ()
 {
+	local FILE
 	for FILE in ${@}
 	do
 		if [ ! -L ${FILE} ]
diff --git a/functions/architectures.sh b/functions/architectures.sh
index 01d2b1f74..3f9ccc527 100755
--- a/functions/architectures.sh
+++ b/functions/architectures.sh
@@ -11,9 +11,11 @@
 
 Check_architectures ()
 {
-	ARCHITECTURES="${@}"
-	VALID=false
+	local ARCHITECTURES
+	ARCHITECTURES="${@}" #must be on separate line to 'local' declaration to avoid error
+	local VALID=false
 
+	local ARCHITECTURE
 	for ARCHITECTURE in ${ARCHITECTURES}
 	do
 		if [ "$(echo ${LB_ARCHITECTURES} | grep ${ARCHITECTURE})" ]
@@ -50,6 +52,7 @@ Check_architectures ()
 
 Check_crossarchitectures ()
 {
+	local HOST
 	if [ $(which dpkg) ]
 	then
 		HOST="$(dpkg --print-architecture)"
@@ -57,6 +60,7 @@ Check_crossarchitectures ()
 		HOST="$(uname -m)"
 	fi
 
+	local CROSS
 	case "${HOST}" in
 		amd64|i386|x86_64)
 			CROSS="amd64 i386"
diff --git a/functions/arguments.sh b/functions/arguments.sh
index 5d406f4b5..f87593204 100755
--- a/functions/arguments.sh
+++ b/functions/arguments.sh
@@ -11,6 +11,7 @@
 
 Arguments ()
 {
+	local ARGUMENTS
 	local ERR=0
 	ARGUMENTS="$(getopt --longoptions breakpoints,color,no-color,conffile:,debug,force,help,quiet,usage,verbose,version --name=${PROGRAM} --options c:huv --shell sh -- "${@}")" || ERR=$?
 
diff --git a/functions/bootloaders.sh b/functions/bootloaders.sh
index 36e132fb5..14e50ac4c 100755
--- a/functions/bootloaders.sh
+++ b/functions/bootloaders.sh
@@ -10,8 +10,9 @@
 
 Is_Requested_Bootloader ()
 {
-	OLDIFS="$IFS"
-	IFS=","
+	local OLDIFS="$IFS"
+	local IFS=","
+	local BOOTLOADER
 	for BOOTLOADER in ${LB_BOOTLOADERS}; do
 		if [ "${BOOTLOADER}" = "${1}" ]; then
 			IFS="$OLDIFS"
diff --git a/functions/breakpoints.sh b/functions/breakpoints.sh
index 6896c0521..e1eff1966 100755
--- a/functions/breakpoints.sh
+++ b/functions/breakpoints.sh
@@ -11,7 +11,7 @@
 
 Breakpoint ()
 {
-	NAME="${1}"
+	local NAME="${1}"
 
 	if [ "${_BREAKPOINTS}" = "true" ]
 	then
diff --git a/functions/cache.sh b/functions/cache.sh
index 4e4c4b884..3e5c7ef70 100755
--- a/functions/cache.sh
+++ b/functions/cache.sh
@@ -11,7 +11,7 @@
 
 Restore_package_cache ()
 {
-	DIRECTORY="cache/packages.${1}"
+	local DIRECTORY="cache/packages.${1}"
 
 	if [ "${LB_CACHE}" = "true" ] && [ "${LB_CACHE_PACKAGES}" = "true" ]
 	then
@@ -32,7 +32,7 @@ Restore_package_cache ()
 
 Save_package_cache ()
 {
-	DIRECTORY="cache/packages.${1}"
+	local DIRECTORY="cache/packages.${1}"
 
 	if [ "${LB_CACHE}" = "true" ] && [ "${LB_CACHE_PACKAGES}" = "true" ]
 	then
@@ -47,6 +47,7 @@ Save_package_cache ()
 			mkdir -p "${DIRECTORY}"
 
 			# Saving new cache
+			local PACKAGE
 			for PACKAGE in chroot/var/cache/apt/archives/*.deb
 			do
 				if [ -e "${DIRECTORY}"/"$(basename ${PACKAGE})" ]
diff --git a/functions/chroot.sh b/functions/chroot.sh
index 374cefd89..5658807e3 100755
--- a/functions/chroot.sh
+++ b/functions/chroot.sh
@@ -11,14 +11,16 @@
 
 Chroot ()
 {
-	CHROOT="${1}"; shift
-	COMMANDS="${@}"
+	local CHROOT="${1}"; shift
+	local COMMANDS
+	COMMANDS="${@}" #must be on separate line to 'local' declaration to avoid error
 
 	# Executing commands in chroot
 	Echo_debug "Executing: %s" "${COMMANDS}"
 
 	ENV=""
 
+	local _FILE
 	for _FILE in config/environment config/environment.chroot
 	do
 		if [ -e "${_FILE}" ]
@@ -39,8 +41,8 @@ Chroot ()
 }
 
 Chroot_has_package() {
-	PACKAGE="${1}"; shift
-	CHROOT="${2:-chroot}"; shift
+	local PACKAGE="${1}"; shift
+	local CHROOT="${2:-chroot}"; shift
 
 	if dpkg-query --admindir=${CHROOT}/var/lib/dpkg -s ${PACKAGE} >/dev/null 2>&1 | grep -q "^Status: install"
 	then
@@ -50,7 +52,7 @@ Chroot_has_package() {
 }
 
 Chroot_package_list() {
-	CHROOT="${1:-chroot}"; shift
+	local CHROOT="${1:-chroot}"; shift
 
 	dpkg-query --admindir=${CHROOT}/var/lib/dpkg -W -f'${Package}\n'
 }
diff --git a/functions/chroot_bind_path.sh b/functions/chroot_bind_path.sh
index e6695dd2f..94a033e85 100755
--- a/functions/chroot_bind_path.sh
+++ b/functions/chroot_bind_path.sh
@@ -11,6 +11,9 @@
 
 Chroot_bind_path ()
 {
+	local CHROOT
+	local BIND_SRC
+	local BIND_DEST
 	CHROOT="$(readlink -f ${1})"
 	BIND_SRC="$(readlink -f ${2})"
 
@@ -27,6 +30,9 @@ Chroot_bind_path ()
 
 Chroot_unbind_path ()
 {
+	local CHROOT
+	local BIND_SRC
+	local BIND_DEST
 	CHROOT="$(readlink -f ${1})"
 	BIND_SRC="$(readlink -f ${2})"
 
diff --git a/functions/conffile.sh b/functions/conffile.sh
index 15f16c93f..ceb11ea06 100755
--- a/functions/conffile.sh
+++ b/functions/conffile.sh
@@ -11,10 +11,12 @@
 
 Get_conffiles ()
 {
+	local FILES
 	if [ -n "${LB_CONFIG}" ]
 	then
 		FILES="${LB_CONFIG}"
 	else
+		local FILE
 		for FILE in ${@}
 		do
 			FILES="${FILES} ${FILE} ${FILE}.${LB_ARCHITECTURES} ${FILE}.${DISTRIBUTION}"
@@ -29,6 +31,7 @@ Get_conffiles ()
 
 Read_conffiles ()
 {
+	local CONFFILE
 	for CONFFILE in $(Get_conffiles "${@}")
 	do
 		if [ -f "${CONFFILE}" ]
@@ -46,6 +49,7 @@ Read_conffiles ()
 
 Print_conffiles ()
 {
+	local CONFFILE
 	for CONFFILE in $(Get_conffiles "${@}")
 	do
 		if [ -f "${CONFFILE}" ]
diff --git a/functions/configuration.sh b/functions/configuration.sh
index 0fb84a962..70faa62a1 100755
--- a/functions/configuration.sh
+++ b/functions/configuration.sh
@@ -11,29 +11,30 @@
 
 Get_configuration ()
 {
-	_CONFIGURATION_FILE="${1}"
-	_FIELD_NAME="${2}"
+	local CONFIGURATION_FILE="${1}"
+	local FIELD_NAME="${2}"
+	local FIELD_BODY
 
-	if [ -e "${_CONFIGURATION_FILE}" ]
+	if [ -e "${CONFIGURATION_FILE}" ]
 	then
-		_FIELD_BODY="$(grep ^${_FIELD_NAME}: ${_CONFIGURATION_FILE} | awk '{ $1=""; print $0 }' | sed -e 's|^ ||')"
+		FIELD_BODY="$(grep ^${FIELD_NAME}: ${CONFIGURATION_FILE} | awk '{ $1=""; print $0 }' | sed -e 's|^ ||')"
 	fi
 
-	echo ${_FIELD_BODY}
+	echo ${FIELD_BODY}
 }
 
 Set_configuration ()
 {
-	_CONFIGURATION_FILE="${1}"
-	_FIELD_NAME="${2}"
-	_FIELD_BODY="${3}"
+	local CONFIGURATION_FILE="${1}"
+	local FIELD_NAME="${2}"
+	local FIELD_BODY="${3}"
 
-	if grep -qs "^${_FIELD_NAME}:" "${_CONFIGURATION_FILE}"
+	if grep -qs "^${FIELD_NAME}:" "${CONFIGURATION_FILE}"
 	then
 		# Update configuration
-		sed -i -e "s|^${_FIELD_NAME}:.*$|${_FIELD_NAME}: ${_FIELD_BODY}|" "${_CONFIGURATION_FILE}"
+		sed -i -e "s|^${FIELD_NAME}:.*$|${FIELD_NAME}: ${FIELD_BODY}|" "${CONFIGURATION_FILE}"
 	else
 		# Append configuration
-		echo "${_FIELD_NAME}: ${_FIELD_BODY}" >> "${_CONFIGURATION_FILE}"
+		echo "${FIELD_NAME}: ${FIELD_BODY}" >> "${CONFIGURATION_FILE}"
 	fi
 }
diff --git a/functions/defaults.sh b/functions/defaults.sh
index 786a9dc4c..14ec0efea 100755
--- a/functions/defaults.sh
+++ b/functions/defaults.sh
@@ -96,6 +96,7 @@ Set_config_defaults ()
 	# Setting mode (currently: debian, progress-linux)
 	if [ $(which lsb_release) ]
 	then
+		local _DISTRIBUTOR
 		_DISTRIBUTOR="$(lsb_release -is | tr "[A-Z]" "[a-z]")"
 
 		case "${_DISTRIBUTOR}" in
@@ -624,6 +625,7 @@ Set_config_defaults ()
 			;;
 	esac
 
+	local _LB_BOOTAPPEND_PRESEED
 	if [ -n "${LB_DEBIAN_INSTALLER_PRESEEDFILE}" ]
 	then
 		case "${LIVE_IMAGE_TYPE}" in
diff --git a/functions/echo.sh b/functions/echo.sh
index e019d8ed7..48cf3cf8e 100755
--- a/functions/echo.sh
+++ b/functions/echo.sh
@@ -12,7 +12,7 @@ exec 3>&1
 
 Echo ()
 {
-	STRING="${1}"
+	local STRING="${1}"
 	shift
 
 	printf "${STRING}\n" "${@}" >&3
@@ -21,7 +21,7 @@ Echo ()
 Echo_debug ()
 {
 	if [ "${_DEBUG}" = "true" ]; then
-		STRING="${1}"
+		local STRING="${1}"
 		shift
 
 		printf "D: ${STRING}\n" "${@}" >&3
@@ -30,7 +30,7 @@ Echo_debug ()
 
 Echo_error ()
 {
-	STRING="${1}"
+	local STRING="${1}"
 	shift
 
 	local PREFIX="${RED}E${NO_COLOR}"
@@ -45,7 +45,7 @@ Echo_message ()
 {
 	if [ "${_QUIET}" != "true" ]
 	then
-		STRING="${1}"
+		local STRING="${1}"
 		shift
 
 		local PREFIX="${PURPLE}P${NO_COLOR}"
@@ -60,7 +60,7 @@ Echo_message ()
 Echo_verbose ()
 {
 	if [ "${_VERBOSE}" = "true" ]; then
-		STRING="${1}"
+		local STRING="${1}"
 		shift
 
 		printf "I: ${STRING}\n" "${@}" >&3
@@ -69,7 +69,7 @@ Echo_verbose ()
 
 Echo_warning ()
 {
-	STRING="${1}"
+	local STRING="${1}"
 	shift
 
 	local PREFIX="${YELLOW}W${NO_COLOR}"
@@ -82,6 +82,7 @@ Echo_warning ()
 
 Echo_file ()
 {
+	local LINE
 	while read -r LINE
 	do
 		echo "${1}: ${LINE}" >&3
diff --git a/functions/firmwarelists.sh b/functions/firmwarelists.sh
index a31860622..345752de4 100755
--- a/functions/firmwarelists.sh
+++ b/functions/firmwarelists.sh
@@ -19,6 +19,7 @@ Firmware_List_From_Contents () {
 	local DISTRO_CHROOT="${2}"
 	local ARCHIVE_AREAS="${3}"
 
+	local _ARCHIVE_AREA
 	for _ARCHIVE_AREA in ${ARCHIVE_AREAS}
 	do
 		local CONTENTS_URL="${MIRROR_CHROOT}/dists/${DISTRO_CHROOT}/${_ARCHIVE_AREA}/Contents-${LB_ARCHITECTURES}.gz"
diff --git a/functions/losetup.sh b/functions/losetup.sh
index c3dd59641..c91852f26 100755
--- a/functions/losetup.sh
+++ b/functions/losetup.sh
@@ -10,8 +10,8 @@
 
 Lodetach ()
 {
-	DEVICE="${1}"
-	ATTEMPT="${2:-1}"
+	local DEVICE="${1}"
+	local ATTEMPT="${2:-1}"
 
 	if [ "${ATTEMPT}" -gt 3 ]
 	then
@@ -37,10 +37,12 @@ Lodetach ()
 
 Losetup ()
 {
-	DEVICE="${1}"
-	FILE="${2}"
-	PARTITION="${3:-1}"
+	local DEVICE="${1}"
+	local FILE="${2}"
+	local PARTITION="${3:-1}"
 
+	local FDISK_OUT
+	local LOOPDEVICE
 	losetup --read-only --partscan "${DEVICE}" "${FILE}"
 	FDISK_OUT="$(fdisk -l -u ${DEVICE} 2>&1)"
 	Lodetach "${DEVICE}"
@@ -53,6 +55,8 @@ Losetup ()
 
 		losetup --partscan "${DEVICE}" "${FILE}"
 	else
+		local SECTORS
+		local OFFSET
 		SECTORS="$(echo "$FDISK_OUT" | sed -ne "s|^$LOOPDEVICE[ *]*\([0-9]*\).*|\1|p")"
 		OFFSET="$(expr ${SECTORS} '*' 512)"
 
@@ -65,7 +69,7 @@ Losetup ()
 # adapted from lib/ext2fs/mkjournal.c, default block size is 4096 bytes (/etc/mke2fs.conf).
 ext2fs_default_journal_size()
 {
-	SIZE="$1"
+	local SIZE="$1"
 	if [ "${SIZE}" -lt "8" ]; then # 2048*4096
 		echo 0
 	elif [ "${SIZE}" -lt "128" ]; then # 32768*4096
@@ -83,9 +87,10 @@ ext2fs_default_journal_size()
 
 Calculate_partition_size_without_journal ()
 {
-	WITHOUT_JOURNAL_ORIGINAL_SIZE="${1}"
-	WITHOUT_JOURNAL_FILESYSTEM="${2}"
+	local WITHOUT_JOURNAL_ORIGINAL_SIZE="${1}"
+	local WITHOUT_JOURNAL_FILESYSTEM="${2}"
 
+	local PERCENT
 	case "${WITHOUT_JOURNAL_FILESYSTEM}" in
 		ext2|ext3|ext4)
 			PERCENT="6"
@@ -100,11 +105,16 @@ Calculate_partition_size_without_journal ()
 
 Calculate_partition_size ()
 {
-	ORIGINAL_SIZE="${1}"
-	FILESYSTEM="${2}"
+	local ORIGINAL_SIZE="${1}"
+	local FILESYSTEM="${2}"
 
 	case "${FILESYSTEM}" in
 		ext3|ext4)
+			local NON_JOURNAL_SIZE
+			local PROJECTED_JOURNAL_SIZE
+			local PROJECTED_PARTITION_SIZE
+			local PRE_FINAL_PARTITION_SIZE
+			local JOURNAL_SIZE
 			NON_JOURNAL_SIZE=$(Calculate_partition_size_without_journal ${ORIGINAL_SIZE} ${FILESYSTEM})
 			PROJECTED_JOURNAL_SIZE=$(ext2fs_default_journal_size ${NON_JOURNAL_SIZE})
 			PROJECTED_PARTITION_SIZE=$(expr ${ORIGINAL_SIZE} + ${PROJECTED_JOURNAL_SIZE})
diff --git a/functions/packagelists.sh b/functions/packagelists.sh
index 4701c3c70..ad31f4909 100755
--- a/functions/packagelists.sh
+++ b/functions/packagelists.sh
@@ -11,17 +11,20 @@
 
 Expand_packagelist ()
 {
+	local _LB_EXPAND_QUEUE
 	_LB_EXPAND_QUEUE="$(basename "${1}")"
 
 	shift
 
 	while [ -n "${_LB_EXPAND_QUEUE}" ]
 	do
+		local _LB_LIST_NAME
+		local _LB_EXPAND_QUEUE
 		_LB_LIST_NAME="$(echo ${_LB_EXPAND_QUEUE} | cut -d" " -f1)"
 		_LB_EXPAND_QUEUE="$(echo ${_LB_EXPAND_QUEUE} | cut -s -d" " -f2-)"
-		_LB_LIST_LOCATION=""
-		_LB_NESTED=0
-		_LB_ENABLED=1
+		local _LB_LIST_LOCATION=""
+		local _LB_NESTED=0
+		local _LB_ENABLED=1
 
 		for _LB_SEARCH_PATH in ${@}
 		do
@@ -42,6 +45,7 @@ Expand_packagelist ()
 		do
 			case "${_LB_LINE}" in
 				\!*)
+					local _EXEC
 					_EXEC="$(echo ${_LB_LINE} | sed -e 's|^!||')"
 
 					case "${LB_BUILD_WITH_CHROOT}" in
@@ -63,6 +67,10 @@ Expand_packagelist ()
 					fi
 					_LB_NESTED=1
 
+					local _LB_NEEDLE
+					local _LB_HAYSTACK
+					local _LB_NEEDLE_PART
+					local _LB_HAYSTACK_PART
 					_LB_NEEDLE="$(echo "${_LB_LINE}" | cut -d' ' -f3-)"
 					_LB_HAYSTACK="$(eval "echo \$LB_$(echo "${_LB_LINE}" | cut -d' ' -f2)")"
 
@@ -87,6 +95,10 @@ Expand_packagelist ()
 					fi
 					_LB_NESTED=1
 
+					local _LB_NEEDLE
+					local _LB_HAYSTACK
+					local _LB_NEEDLE_PART
+					local _LB_HAYSTACK_PART
 					_LB_NEEDLE="$(echo "${_LB_LINE}" | cut -d' ' -f3-)"
 					_LB_HAYSTACK="$(eval "echo \$LB_$(echo "${_LB_LINE}" | cut -d' ' -f2)")"
 
@@ -126,13 +138,15 @@ Expand_packagelist ()
 
 Discover_package_architectures ()
 {
-	_LB_EXPANDED_PKG_LIST="${1}"
-	_LB_DISCOVERED_ARCHITECTURES=""
+	local _LB_EXPANDED_PKG_LIST="${1}"
+	local _LB_DISCOVERED_ARCHITECTURES=""
 
 	shift
 
 	if [ -e "${_LB_EXPANDED_PKG_LIST}" ] && [ -s "${_LB_EXPANDED_PKG_LIST}" ]
 	then
+		local _LB_PACKAGE_LINE
+		local _LB_PACKAGE_LINE_PART
 		while read _LB_PACKAGE_LINE
 		do
 			# Lines from the expanded package list may have multiple, space-separated packages
diff --git a/functions/packages.sh b/functions/packages.sh
index f07bed35f..fa16b1161 100755
--- a/functions/packages.sh
+++ b/functions/packages.sh
@@ -9,11 +9,12 @@
 ## under certain conditions; see COPYING for details.
 
 
+# Note, updates _LB_PACKAGES
 Check_package ()
 {
-	CHROOT="${1}"
-	FILE="${2}"
-	PACKAGE="${3}"
+	local CHROOT="${1}"
+	local FILE="${2}"
+	local PACKAGE="${3}"
 
 	Check_installed "${CHROOT}" "${FILE}" "${PACKAGE}"
 
@@ -68,9 +69,9 @@ Remove_package ()
 #                  2 if package isn't installed and we aren't in an apt managed system
 Check_installed ()
 {
-	CHROOT="${1}"
-	FILE="${2}"
-	PACKAGE="${3}"
+	local CHROOT="${1}"
+	local FILE="${2}"
+	local PACKAGE="${3}"
 
 	if [ "${LB_BUILD_WITH_CHROOT}" = "true" ] && [ "${CHROOT}" = "chroot" ]
 	then
diff --git a/functions/stagefile.sh b/functions/stagefile.sh
index 09168f5f4..9ef4789c9 100755
--- a/functions/stagefile.sh
+++ b/functions/stagefile.sh
@@ -44,11 +44,15 @@ Create_stagefile ()
 
 Require_stagefile ()
 {
+	local NAME
+	local FILES
+	local NUMBER
 	NAME="$(basename ${0})"
-	FILES="${@}"
+	FILES="${@}" #must be on separate line to 'local' declaration to avoid error
 	NUMBER="$(echo ${@} | wc -w)"
 
-	CONTINUE=false
+	local FILE
+	local CONTINUE=false
 	for FILE in ${FILES}
 	do
 		# Find at least one of the required stages
diff --git a/functions/wrapper.sh b/functions/wrapper.sh
index 002de785e..e96e1ac4e 100755
--- a/functions/wrapper.sh
+++ b/functions/wrapper.sh
@@ -11,7 +11,7 @@
 
 Apt ()
 {
-	CHROOT="${1}"
+	local CHROOT="${1}"
 	shift
 
 	case "${LB_APT}" in
diff --git a/scripts/build/binary_grub-legacy b/scripts/build/binary_grub-legacy
index 442b70326..fd54e7f64 100755
--- a/scripts/build/binary_grub-legacy
+++ b/scripts/build/binary_grub-legacy
@@ -50,10 +50,10 @@ Install_package
 # Local functions
 Grub_live_entry ()
 {
-	LABEL="${1}"
-	KERNEL="${2}"
-	INITRD="${3}"
-	APPEND="${4}"
+	local LABEL="${1}"
+	local KERNEL="${2}"
+	local INITRD="${3}"
+	local APPEND="${4}"
 
 	LINUX_LIVE="${LINUX_LIVE}\ntitle\t\tDebian GNU/Linux - ${LABEL}"
 	LINUX_LIVE="${LINUX_LIVE}\nkernel\t\t/${KERNEL} ${INITFS:+boot=${INITFS} }config LB_BOOTAPPEND_LIVE ${APPEND}"
@@ -62,15 +62,14 @@ Grub_live_entry ()
 
 Grub_install_entry ()
 {
-	LABEL="${1}"
-	KERNEL="${2}"
-	INITRD="${3}"
-	APPEND="${4}"
+	local LABEL="${1}"
+	local KERNEL="${2}"
+	local INITRD="${3}"
+	local APPEND="${4}"
 
-	APPEND="${APPEND} LB_BOOTAPPEND_INSTALL"
+	local APPEND="${APPEND} LB_BOOTAPPEND_INSTALL"
 
-	if [ "${LABEL}" != "expert" ] && [ "${LABEL}" != "expertgui" ]
-	then
+	if [ "${LABEL}" != "expert" ] && [ "${LABEL}" != "expertgui" ]; then
 		APPEND="${APPEND} --- quiet"
 	fi
 
diff --git a/scripts/build/binary_hdd b/scripts/build/binary_hdd
index a4d907fdd..bc9c61672 100755
--- a/scripts/build/binary_hdd
+++ b/scripts/build/binary_hdd
@@ -287,6 +287,8 @@ find /live/vmlinuz
 EOM
 EOF
 
+	local rootpartition
+	local hdddev
 	rootpartition="$(Chroot chroot 'sh grub.sh' 2>/dev/null | grep -A 1 'find /live/vmlinuz' | grep -v 'find /live/vmlinuz')"
 	hdddev="$(echo $rootpartition | sed -e 's|,[[:digit:]]||')"
 	echo "Root partition is $rootpartition, device is: $hdddev"
diff --git a/scripts/build/binary_loopback_cfg b/scripts/build/binary_loopback_cfg
index 0b8af76a4..62681603a 100755
--- a/scripts/build/binary_loopback_cfg
+++ b/scripts/build/binary_loopback_cfg
@@ -66,11 +66,11 @@ Grub_live_entry ()
 
 Grub_install_entry ()
 {
-	LABEL="${1}"
-	TYPE="${2}"
-	KERNEL="${3}"
-	INITRD="${4}"
-	APPEND="${5}"
+	local LABEL="${1}"
+	local TYPE="${2}"
+	local KERNEL="${3}"
+	local INITRD="${4}"
+	local APPEND="${5}"
 
 	# Drop "quiet" kernel parameter for expert entries
 	case $TYPE in
diff --git a/scripts/build/config b/scripts/build/config
index 1d0c150ff..2b9ff701c 100755
--- a/scripts/build/config
+++ b/scripts/build/config
@@ -137,6 +137,7 @@ USAGE="${PROGRAM}   [--apt apt|aptitude]\n\
 
 Local_arguments ()
 {
+	local LONG_OPTIONS
 	LONG_OPTIONS="apt:,apt-ftp-proxy:,apt-http-proxy:,apt-options:,aptitude-options:,debootstrap-options:,debootstrap-script:,
 		apt-pipeline:,apt-recommends:,apt-secure:,apt-source-archives:,cache:,cache-indices:,cache-packages:,
 		cache-stages:,debconf-frontend:,debconf-priority:,dump,
@@ -165,6 +166,7 @@ Local_arguments ()
 	# Remove spaces added by indentation
 	LONG_OPTIONS="$(echo ${LONG_OPTIONS} | tr -d ' ')"
 
+	local ARGUMENTS
 	local ERR=0
 	ARGUMENTS="$(getopt --longoptions ${LONG_OPTIONS} --name="${PROGRAM}" --options a:d:m:k:b:s:c:huv --shell sh -- "${@}")" || ERR=$?
 
@@ -183,6 +185,7 @@ Local_arguments ()
 		case "${1}" in
 			--dump)
 				# Dump version
+				local VERSION_DPKG
 				if [ $(which dpkg-query) ]
 				then
 					VERSION_DPKG="$(dpkg-query -f='${Version}' --show live-build)"
@@ -194,6 +197,7 @@ Local_arguments ()
 				Print_conffiles $(Common_config_files)
 
 				# Dump contents of directories that contain text files
+				local DIRECTORY
 				for DIRECTORY in config/package-lists config/apt config/preseed config/rootfs
 				do
 					if Find_files "${DIRECTORY}"
diff --git a/scripts/build/installer_debian-installer b/scripts/build/installer_debian-installer
index 343c678ee..5eb935fe6 100755
--- a/scripts/build/installer_debian-installer
+++ b/scripts/build/installer_debian-installer
@@ -151,8 +151,7 @@ case "${LB_ARCHITECTURES}" in
 esac
 
 Install_file() {
-	local FILE
-	FILE="${1}"
+	local FILE="${1}"
 
 	Echo_debug "Installing file %s" "${FILE}"
 
@@ -166,9 +165,9 @@ Install_file() {
 		ARCHIVE_AREA="main"
 	fi
 
-	local TARGET
-	TARGET="${2}/${ARCHIVE_AREA}"
+	local TARGET="${2}/${ARCHIVE_AREA}"
 
+	local SOURCE
 	SOURCE="$(dpkg -f ${FILE} Source | awk '{ print $1 }')"
 
 	if [ -z "${SOURCE}" ]
@@ -176,6 +175,7 @@ Install_file() {
 		SOURCE="$(basename ${FILE} | awk -F_ '{ print $1 }')"
 	fi
 
+	local LETTER
 	case "${SOURCE}" in
 		lib?*)
 			LETTER="$(echo ${SOURCE} | sed 's|\(....\).*|\1|')"
@@ -198,14 +198,12 @@ Install_file() {
 _LB_CACHE_DIR="$(pwd)/cache/installer_debian-installer"
 
 Download_file () {
-	local _LB_TARGET
-	_LB_TARGET="${1}"
-
-	local _LB_URL
-	_LB_URL="${2}"
+	local _LB_TARGET="${1}"
+	local _LB_URL="${2}"
 
 	Echo_debug "Downloading file \`%s\` from \`%s\`" "${_LB_TARGET}" "${_LB_URL}"
 
+	local _LB_CACHE_FILE
 	_LB_CACHE_FILE="${_LB_CACHE_DIR}/$(echo "${_LB_URL}" | sed 's|/|_|g')"
 
 	if [ ! -f "${_LB_CACHE_FILE}" ]
@@ -795,11 +793,9 @@ fi
 
 Repack_initrd()
 {
-	local TARGET_INITRD
-	local INCLUDE_PATH
-	TARGET_INITRD="${1}"
-	INCLUDE_PATH="${2}"
-	REPACK_TMPDIR="unpacked-initrd"
+	local TARGET_INITRD="${1}"
+	local INCLUDE_PATH="${2}"
+	local REPACK_TMPDIR="unpacked-initrd"
 
 	Echo_debug "Repacking initrd \`%s\`" "${TARGET_INITRD}"
 
@@ -816,6 +812,7 @@ Repack_initrd()
 	if [ ! -d "${INCLUDE_PATH}" ]
 	then
 		# Invoked the old way, just copy the preseeds
+		local _FILE
 		for _FILE in ../config/preseed/*.cfg ../config/preseed/*.cfg.installer
 		do
 			if [ -e "${_FILE}" ]
@@ -825,7 +822,7 @@ Repack_initrd()
 		done
 	else
 		# New way, include target directory content in the initrd
-		REPACK_TMPDIR_ABS="${PWD}"
+		local REPACK_TMPDIR_ABS="${PWD}"
 		cd "${INCLUDE_PATH}"
 		find -print0 | cpio -pumd0 --no-preserve-owner "${REPACK_TMPDIR_ABS}/"
 		cd "${OLDPWD}"