diff --git a/README.md b/README.md
index d448c1b..7a9b6ff 100755
--- a/README.md
+++ b/README.md
@@ -87,7 +87,8 @@ The following environment variables are supported:
 
  * `USE_QEMU` (Default: `"0"`)
 
-   This enable the Qemu mode and set filesystem and image suffix if set to 1.
+   Setting to '1' enables the QEMU mode - creating an image that can be mounted via QEMU for an emulated
+   environment. These images include "-qemu" in the image file name.
 
 
 A simple example for building Raspbian:
@@ -115,7 +116,7 @@ The following process is followed to build images:
    There are a number of different files and directories which can be used to
    control different parts of the build process:
 
-     - **00-run.sh** - A unix shell script. Needs to be made executable for it to run
+     - **00-run.sh** - A unix shell script. Needs to be made executable for it to run.
 
      - **00-run-chroot.sh** - A unix shell script which will be run in the chroot
        of the image build directory. Needs to be made executable for it to run.
@@ -127,9 +128,11 @@ The following process is followed to build images:
        separated, per line.
 
      - **00-packages-nr** - As 00-packages, except these will be installed using
-       the ```--no-install-recommends -y``` parameters to apt-get
 
-     - **00-patches** - A directory containing patch files to be applied
+     - **00-patches** - A directory containing patch files to be applied, using quilt.
+       If a file named 'EDIT' is present in the directory, the build process will
+       be interrupted with a bash session, allowing an opportunity to create/revise
+       the patches.
 
   * If the stage directory contains files called "EXPORT_NOOBS" or "EXPORT_IMAGE" then
     add this stage to a list of images to generate
@@ -156,6 +159,12 @@ continue:
 CONTINUE=1 ./build-docker.sh
 ```
 
+After successful build, the build container is by default removed. This may be undesired when making incremental changes to a customized build. To prevent the build script from remove the container add
+
+```bash
+PRESERVE_CONTAINER=1 ./build-docker.sh
+```
+
 There is a possibility that even when running from a docker container, the
 installation of `qemu-user-static` will silently fail when building the image
 because `binfmt-support` _must be enabled on the underlying kernel_. An easy
@@ -224,14 +233,14 @@ If you wish to build up to a specified stage (such as building up to stage 2
 for a lite system), place an empty file named `SKIP` in each of the `./stage`
 directories you wish not to include.
 
-Then remove the `EXPORT*` files from `./stage4` (if building up to stage 2) or
-from `./stage2` (if building a minimal system).
+Then add an empty file named `SKIP_IMAGES` to `./stage4` (if building up to stage 2) or
+to `./stage2` (if building a minimal system).
 
 ```bash
 # Example for building a lite system
 echo "IMG_NAME='Raspbian'" > config
 touch ./stage3/SKIP ./stage4/SKIP ./stage5/SKIP
-rm stage4/EXPORT* stage5/EXPORT*
+touch ./stage4/SKIP_IMAGES ./stage5/SKIP_IMAGES
 sudo ./build.sh  # or ./build-docker.sh
 ```
 
diff --git a/build-docker.sh b/build-docker.sh
index e0a9b90..16d20f5 100755
--- a/build-docker.sh
+++ b/build-docker.sh
@@ -21,6 +21,7 @@ fi
 
 CONTAINER_NAME=${CONTAINER_NAME:-pigen_work}
 CONTINUE=${CONTINUE:-0}
+PRESERVE_CONTAINER=${PRESERVE_CONTAINER:-0}
 
 if [ "$*" != "" ] || [ -z "${IMG_NAME}" ]; then
 	if [ -z "${IMG_NAME}" ]; then
@@ -33,6 +34,7 @@ Usage:
 Optional environment arguments: ( =<default> )
     CONTAINER_NAME=pigen_work  set a name for the build container
     CONTINUE=1                 continue from a previously started container
+    PRESERVE_CONTAINER=1       keep build container even on successful build
 EOF
 	exit 1
 fi
@@ -55,7 +57,7 @@ if [ "$CONTAINER_EXISTS" != "" ]; then
 	trap "echo 'got CTRL+C... please wait 5s'; $DOCKER stop -t 5 ${CONTAINER_NAME}_cont" SIGINT SIGTERM
 	time $DOCKER run --rm --privileged \
 		--volumes-from="${CONTAINER_NAME}" --name "${CONTAINER_NAME}_cont" \
-		-e IMG_NAME=${IMG_NAME}\
+		-e IMG_NAME="${IMG_NAME}"\
 		pi-gen \
 		bash -e -o pipefail -c "dpkg-reconfigure qemu-user-static &&
 	cd /pi-gen; ./build.sh;
@@ -64,7 +66,7 @@ if [ "$CONTAINER_EXISTS" != "" ]; then
 else
 	trap "echo 'got CTRL+C... please wait 5s'; $DOCKER stop -t 5 ${CONTAINER_NAME}" SIGINT SIGTERM
 	time $DOCKER run --name "${CONTAINER_NAME}" --privileged \
-		-e IMG_NAME=${IMG_NAME}\
+		-e IMG_NAME="${IMG_NAME}"\
 		"${config_file[@]}" \
 		pi-gen \
 		bash -e -o pipefail -c "dpkg-reconfigure qemu-user-static &&
@@ -75,6 +77,10 @@ fi
 echo "copying results from deploy/"
 $DOCKER cp "${CONTAINER_NAME}":/pi-gen/deploy .
 ls -lah deploy
-$DOCKER rm -v $CONTAINER_NAME
+
+# cleanup
+if [ "$PRESERVE_CONTAINER" != "1" ]; then
+	$DOCKER rm -v $CONTAINER_NAME
+fi
 
 echo "Done! Your image(s) should be in deploy/"
diff --git a/build.sh b/build.sh
index d72d4f5..ebeb46a 100755
--- a/build.sh
+++ b/build.sh
@@ -1,22 +1,23 @@
 #!/bin/bash -e
-
+# shellcheck disable=SC2119,SC1091
 run_sub_stage()
 {
 	log "Begin ${SUB_STAGE_DIR}"
-	pushd ${SUB_STAGE_DIR} > /dev/null
+	pushd "${SUB_STAGE_DIR}" > /dev/null
 	for i in {00..99}; do
-		if [ -f ${i}-debconf ]; then
+		if [ -f "${i}-debconf" ]; then
 			log "Begin ${SUB_STAGE_DIR}/${i}-debconf"
 			on_chroot << EOF
 debconf-set-selections <<SELEOF
-`cat ${i}-debconf`
+$(cat "${i}-debconf")
 SELEOF
 EOF
+
 		log "End ${SUB_STAGE_DIR}/${i}-debconf"
 		fi
-		if [ -f ${i}-packages-nr ]; then
+		if [ -f "${i}-packages-nr" ]; then
 			log "Begin ${SUB_STAGE_DIR}/${i}-packages-nr"
-			PACKAGES="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < ${i}-packages-nr)"
+			PACKAGES="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < "${i}-packages-nr")"
 			if [ -n "$PACKAGES" ]; then
 				on_chroot << EOF
 apt-get install --no-install-recommends -y $PACKAGES
@@ -24,9 +25,9 @@ EOF
 			fi
 			log "End ${SUB_STAGE_DIR}/${i}-packages-nr"
 		fi
-		if [ -f ${i}-packages ]; then
+		if [ -f "${i}-packages" ]; then
 			log "Begin ${SUB_STAGE_DIR}/${i}-packages"
-			PACKAGES="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < ${i}-packages)"
+			PACKAGES="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < "${i}-packages")"
 			if [ -n "$PACKAGES" ]; then
 				on_chroot << EOF
 apt-get install -y $PACKAGES
@@ -34,18 +35,18 @@ EOF
 			fi
 			log "End ${SUB_STAGE_DIR}/${i}-packages"
 		fi
-		if [ -d ${i}-patches ]; then
+		if [ -d "${i}-patches" ]; then
 			log "Begin ${SUB_STAGE_DIR}/${i}-patches"
-			pushd ${STAGE_WORK_DIR} > /dev/null
+			pushd "${STAGE_WORK_DIR}" > /dev/null
 			if [ "${CLEAN}" = "1" ]; then
 				rm -rf .pc
-				rm -rf *-pc
+				rm -rf ./*-pc
 			fi
-			QUILT_PATCHES=${SUB_STAGE_DIR}/${i}-patches
-			SUB_STAGE_QUILT_PATCH_DIR="$(basename $SUB_STAGE_DIR)-pc"
-			mkdir -p $SUB_STAGE_QUILT_PATCH_DIR
-			ln -snf $SUB_STAGE_QUILT_PATCH_DIR .pc
-			if [ -e ${SUB_STAGE_DIR}/${i}-patches/EDIT ]; then
+			QUILT_PATCHES="${SUB_STAGE_DIR}/${i}-patches"
+			SUB_STAGE_QUILT_PATCH_DIR="$(basename "$SUB_STAGE_DIR")-pc"
+			mkdir -p "$SUB_STAGE_QUILT_PATCH_DIR"
+			ln -snf "$SUB_STAGE_QUILT_PATCH_DIR" .pc
+			if [ -e "${SUB_STAGE_DIR}/${i}-patches/EDIT" ]; then
 				echo "Dropping into bash to edit patches..."
 				bash
 			fi
@@ -80,20 +81,20 @@ EOF
 
 run_stage(){
 	log "Begin ${STAGE_DIR}"
-	STAGE=$(basename ${STAGE_DIR})
-	pushd ${STAGE_DIR} > /dev/null
-	unmount ${WORK_DIR}/${STAGE}
-	STAGE_WORK_DIR=${WORK_DIR}/${STAGE}
-	ROOTFS_DIR=${STAGE_WORK_DIR}/rootfs
+	STAGE="$(basename "${STAGE_DIR}")"
+	pushd "${STAGE_DIR}" > /dev/null
+	unmount "${WORK_DIR}/${STAGE}"
+	STAGE_WORK_DIR="${WORK_DIR}/${STAGE}"
+	ROOTFS_DIR="${STAGE_WORK_DIR}"/rootfs
 	if [ ! -f SKIP_IMAGES ]; then
-		if [ -f ${STAGE_DIR}/EXPORT_IMAGE ]; then
+		if [ -f "${STAGE_DIR}/EXPORT_IMAGE" ]; then
 			EXPORT_DIRS="${EXPORT_DIRS} ${STAGE_DIR}"
 		fi
 	fi
 	if [ ! -f SKIP ]; then
 		if [ "${CLEAN}" = "1" ]; then
-			if [ -d ${ROOTFS_DIR} ]; then
-				rm -rf ${ROOTFS_DIR}
+			if [ -d "${ROOTFS_DIR}" ]; then
+				rm -rf "${ROOTFS_DIR}"
 			fi
 		fi
 		if [ -x prerun.sh ]; then
@@ -102,16 +103,16 @@ run_stage(){
 			log "End ${STAGE_DIR}/prerun.sh"
 		fi
 		for SUB_STAGE_DIR in ${STAGE_DIR}/*; do
-			if [ -d ${SUB_STAGE_DIR} ] &&
-			   [ ! -f ${SUB_STAGE_DIR}/SKIP ]; then
+			if [ -d "${SUB_STAGE_DIR}" ] &&
+			   [ ! -f "${SUB_STAGE_DIR}/SKIP" ]; then
 				run_sub_stage
 			fi
 		done
 	fi
-	unmount ${WORK_DIR}/${STAGE}
-	PREV_STAGE=${STAGE}
-	PREV_STAGE_DIR=${STAGE_DIR}
-	PREV_ROOTFS_DIR=${ROOTFS_DIR}
+	unmount "${WORK_DIR}/${STAGE}"
+	PREV_STAGE="${STAGE}"
+	PREV_STAGE_DIR="${STAGE_DIR}"
+	PREV_ROOTFS_DIR="${ROOTFS_DIR}"
 	popd > /dev/null
 	log "End ${STAGE_DIR}"
 }
@@ -131,15 +132,17 @@ if [ -z "${IMG_NAME}" ]; then
 	exit 1
 fi
 
-export USE_QEMU=${USE_QEMU:-0}
-export IMG_DATE=${IMG_DATE:-"$(date +%Y-%m-%d)"}
+export USE_QEMU="${USE_QEMU:-0}"
+export IMG_DATE="${IMG_DATE:-"$(date +%Y-%m-%d)"}"
 
-export BASE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+BASE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 export SCRIPT_DIR="${BASE_DIR}/scripts"
-export WORK_DIR=${WORK_DIR:-"${BASE_DIR}/work/${IMG_DATE}-${IMG_NAME}"}
+export WORK_DIR="${WORK_DIR:-"${BASE_DIR}/work/${IMG_DATE}-${IMG_NAME}"}"
 export DEPLOY_DIR=${DEPLOY_DIR:-"${BASE_DIR}/deploy"}
 export LOG_FILE="${WORK_DIR}/build.log"
 
+export BASE_DIR
+
 export CLEAN
 export IMG_NAME
 export APT_PROXY
@@ -162,29 +165,33 @@ export QUILT_NO_DIFF_INDEX=1
 export QUILT_NO_DIFF_TIMESTAMPS=1
 export QUILT_REFRESH_ARGS="-p ab"
 
-source ${SCRIPT_DIR}/common
-source ${SCRIPT_DIR}/dependencies_check
+# shellcheck source=scripts/common
+source "${SCRIPT_DIR}/common"
+# shellcheck source=scripts/dependencies_check
+source "${SCRIPT_DIR}/dependencies_check"
 
 
-dependencies_check ${BASE_DIR}/depends
+dependencies_check "${BASE_DIR}/depends"
 
-mkdir -p ${WORK_DIR}
+mkdir -p "${WORK_DIR}"
 log "Begin ${BASE_DIR}"
 
-for STAGE_DIR in ${BASE_DIR}/stage*; do
+for STAGE_DIR in "${BASE_DIR}/stage"*; do
 	run_stage
 done
 
 CLEAN=1
 for EXPORT_DIR in ${EXPORT_DIRS}; do
 	STAGE_DIR=${BASE_DIR}/export-image
+	# shellcheck source=/dev/null
 	source "${EXPORT_DIR}/EXPORT_IMAGE"
-	EXPORT_ROOTFS_DIR=${WORK_DIR}/$(basename ${EXPORT_DIR})/rootfs
+	EXPORT_ROOTFS_DIR=${WORK_DIR}/$(basename "${EXPORT_DIR}")/rootfs
 	run_stage
 	if [ "${USE_QEMU}" != "1" ]; then
-		if [ -e ${EXPORT_DIR}/EXPORT_NOOBS ]; then
-			source ${EXPORT_DIR}/EXPORT_NOOBS
-			STAGE_DIR=${BASE_DIR}/export-noobs
+		if [ -e "${EXPORT_DIR}/EXPORT_NOOBS" ]; then
+			# shellcheck source=/dev/null
+			source "${EXPORT_DIR}/EXPORT_NOOBS"
+			STAGE_DIR="${BASE_DIR}/export-noobs"
 			run_stage
 		fi
 	fi
diff --git a/export-image/00-allow-rerun/00-run.sh b/export-image/00-allow-rerun/00-run.sh
index 1355b2e..f7c5b4e 100755
--- a/export-image/00-allow-rerun/00-run.sh
+++ b/export-image/00-allow-rerun/00-run.sh
@@ -1,13 +1,5 @@
 #!/bin/bash -e
 
-if [ -e ${ROOTFS_DIR}/etc/ld.so.preload ]; then
-	mv ${ROOTFS_DIR}/etc/ld.so.preload ${ROOTFS_DIR}/etc/ld.so.preload.disabled
-fi
-
-if [ ! -e ${ROOTFS_DIR}/usr/sbin/policy-rc.d ]; then
-	install -m 744 files/policy-rc.d ${ROOTFS_DIR}/usr/sbin/
-fi
-
-if [ ! -x ${ROOTFS_DIR}/usr/bin/qemu-arm-static ]; then
-	cp /usr/bin/qemu-arm-static ${ROOTFS_DIR}/usr/bin/
+if [ ! -x "${ROOTFS_DIR}/usr/bin/qemu-arm-static" ]; then
+	cp /usr/bin/qemu-arm-static "${ROOTFS_DIR}/usr/bin/"
 fi
diff --git a/export-image/00-allow-rerun/files/policy-rc.d b/export-image/00-allow-rerun/files/policy-rc.d
deleted file mode 100644
index 1924710..0000000
--- a/export-image/00-allow-rerun/files/policy-rc.d
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-
-exit 101
diff --git a/export-image/02-network/01-run.sh b/export-image/02-network/01-run.sh
index e21b791..4150732 100755
--- a/export-image/02-network/01-run.sh
+++ b/export-image/02-network/01-run.sh
@@ -1,3 +1,3 @@
 #!/bin/bash -e
 
-install -m 644 files/resolv.conf ${ROOTFS_DIR}/etc/
+install -m 644 files/resolv.conf "${ROOTFS_DIR}/etc/"
diff --git a/export-image/03-set-partuuid/00-run.sh b/export-image/03-set-partuuid/00-run.sh
index 4b18405..29edc67 100755
--- a/export-image/03-set-partuuid/00-run.sh
+++ b/export-image/03-set-partuuid/00-run.sh
@@ -2,12 +2,12 @@
 
 IMG_FILE="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img"
 
-IMGID="$(dd if=${IMG_FILE} skip=440 bs=1 count=4 2>/dev/null | xxd -e | cut -f 2 -d' ')"
+IMGID="$(dd if="${IMG_FILE}" skip=440 bs=1 count=4 2>/dev/null | xxd -e | cut -f 2 -d' ')"
 
 BOOT_PARTUUID="${IMGID}-01"
 ROOT_PARTUUID="${IMGID}-02"
 
-sed -i "s/BOOTDEV/PARTUUID=${BOOT_PARTUUID}/" ${ROOTFS_DIR}/etc/fstab
-sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" ${ROOTFS_DIR}/etc/fstab
+sed -i "s/BOOTDEV/PARTUUID=${BOOT_PARTUUID}/" "${ROOTFS_DIR}/etc/fstab"
+sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${ROOTFS_DIR}/etc/fstab"
 
-sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" ${ROOTFS_DIR}/boot/cmdline.txt
+sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${ROOTFS_DIR}/boot/cmdline.txt"
diff --git a/export-image/04-finalise/01-run.sh b/export-image/04-finalise/01-run.sh
index f04c7ee..e8662a0 100755
--- a/export-image/04-finalise/01-run.sh
+++ b/export-image/04-finalise/01-run.sh
@@ -8,80 +8,75 @@ on_chroot << EOF
 hardlink -t /usr/share/doc
 EOF
 
-if [ -d ${ROOTFS_DIR}/home/pi/.config ]; then
-	chmod 700 ${ROOTFS_DIR}/home/pi/.config
+if [ -d "${ROOTFS_DIR}/home/pi/.config" ]; then
+	chmod 700 "${ROOTFS_DIR}/home/pi/.config"
 fi
 
-rm -f ${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache
-rm -f ${ROOTFS_DIR}/usr/sbin/policy-rc.d
-rm -f ${ROOTFS_DIR}/usr/bin/qemu-arm-static
-if [ "${USE_QEMU}" != "1" ]; then
-	if [ -e ${ROOTFS_DIR}/etc/ld.so.preload.disabled ]; then
-		mv ${ROOTFS_DIR}/etc/ld.so.preload.disabled ${ROOTFS_DIR}/etc/ld.so.preload
-	fi
-fi
+rm -f "${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache"
+rm -f "${ROOTFS_DIR}/usr/bin/qemu-arm-static"
 
-rm -f ${ROOTFS_DIR}/etc/apt/sources.list~
-rm -f ${ROOTFS_DIR}/etc/apt/trusted.gpg~
+rm -f "${ROOTFS_DIR}/etc/apt/sources.list~"
+rm -f "${ROOTFS_DIR}/etc/apt/trusted.gpg~"
 
-rm -f ${ROOTFS_DIR}/etc/passwd-
-rm -f ${ROOTFS_DIR}/etc/group-
-rm -f ${ROOTFS_DIR}/etc/shadow-
-rm -f ${ROOTFS_DIR}/etc/gshadow-
+rm -f "${ROOTFS_DIR}/etc/passwd-"
+rm -f "${ROOTFS_DIR}/etc/group-"
+rm -f "${ROOTFS_DIR}/etc/shadow-"
+rm -f "${ROOTFS_DIR}/etc/gshadow-"
 
-rm -f ${ROOTFS_DIR}/var/cache/debconf/*-old
-rm -f ${ROOTFS_DIR}/var/lib/dpkg/*-old
+rm -f "${ROOTFS_DIR}"/var/cache/debconf/*-old
+rm -f "${ROOTFS_DIR}"/var/lib/dpkg/*-old
 
-rm -f ${ROOTFS_DIR}/usr/share/icons/*/icon-theme.cache
+rm -f "${ROOTFS_DIR}"/usr/share/icons/*/icon-theme.cache
 
-rm -f ${ROOTFS_DIR}/var/lib/dbus/machine-id
+rm -f "${ROOTFS_DIR}/var/lib/dbus/machine-id"
 
-true > ${ROOTFS_DIR}/etc/machine-id
+true > "${ROOTFS_DIR}/etc/machine-id"
 
-ln -nsf /proc/mounts ${ROOTFS_DIR}/etc/mtab
+ln -nsf /proc/mounts "${ROOTFS_DIR}/etc/mtab"
 
-for _FILE in $(find ${ROOTFS_DIR}/var/log/ -type f); do
-	true > ${_FILE}
-done
+find "${ROOTFS_DIR}/var/log/" -type f -exec cp /dev/null {} \;
 
 rm -f "${ROOTFS_DIR}/root/.vnc/private.key"
 rm -f "${ROOTFS_DIR}/etc/vnc/updateid"
 
-update_issue $(basename ${EXPORT_DIR})
-install -m 644 ${ROOTFS_DIR}/etc/rpi-issue ${ROOTFS_DIR}/boot/issue.txt
-install files/LICENSE.oracle ${ROOTFS_DIR}/boot/
+update_issue "$(basename "${EXPORT_DIR}")"
+install -m 644 "${ROOTFS_DIR}/etc/rpi-issue" "${ROOTFS_DIR}/boot/issue.txt"
+install files/LICENSE.oracle "${ROOTFS_DIR}/boot/"
 
 
 cp "$ROOTFS_DIR/etc/rpi-issue" "$INFO_FILE"
 
-firmware=$(zgrep "firmware as of" "$ROOTFS_DIR/usr/share/doc/raspberrypi-kernel/changelog.Debian.gz" | \
-	head -n1 | \
-	sed  -n 's|.* \([^ ]*\)$|\1|p')
 
-printf "\nFirmware: https://github.com/raspberrypi/firmware/tree/%s\n" "$firmware" >> "$INFO_FILE"
+{
+	firmware=$(zgrep "firmware as of" \
+		"$ROOTFS_DIR/usr/share/doc/raspberrypi-kernel/changelog.Debian.gz" | \
+		head -n1 | sed  -n 's|.* \([^ ]*\)$|\1|p')
+	printf "\nFirmware: https://github.com/raspberrypi/firmware/tree/%s\n" "$firmware"
 
-kernel=$(curl -s -L "https://github.com/raspberrypi/firmware/raw/$firmware/extra/git_hash")
-printf "Kernel: https://github.com/raspberrypi/linux/tree/%s\n" "$kernel" >> "$INFO_FILE"
+	kernel="$(curl -s -L "https://github.com/raspberrypi/firmware/raw/$firmware/extra/git_hash")"
+	printf "Kernel: https://github.com/raspberrypi/linux/tree/%s\n" "$kernel"
 
-uname=$(curl -s -L "https://github.com/raspberrypi/firmware/raw/$firmware/extra/uname_string7")
-printf "Uname string: %s\n" "$uname" >> "$INFO_FILE"
+	uname="$(curl -s -L "https://github.com/raspberrypi/firmware/raw/$firmware/extra/uname_string7")"
 
-printf "\nPackages:\n">> "$INFO_FILE"
-dpkg -l --root "$ROOTFS_DIR" >> "$INFO_FILE"
+	printf "Uname string: %s\n" "$uname"
+	printf "\nPackages:\n"
+	dpkg -l --root "$ROOTFS_DIR"
+} >> "$INFO_FILE"
 
-ROOT_DEV=$(mount | grep "${ROOTFS_DIR} " | cut -f1 -d' ')
+ROOT_DEV="$(mount | grep "${ROOTFS_DIR} " | cut -f1 -d' ')"
 
-unmount ${ROOTFS_DIR}
-zerofree -v ${ROOT_DEV}
+unmount "${ROOTFS_DIR}"
+zerofree -v "${ROOT_DEV}"
 
-unmount_image ${IMG_FILE}
+unmount_image "${IMG_FILE}"
 
-mkdir -p ${DEPLOY_DIR}
+mkdir -p "${DEPLOY_DIR}"
 
-rm -f ${DEPLOY_DIR}/image_${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.zip
+rm -f "${DEPLOY_DIR}/image_${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.zip"
 
-pushd ${STAGE_WORK_DIR} > /dev/null
-zip ${DEPLOY_DIR}/image_${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.zip $(basename ${IMG_FILE})
+pushd "${STAGE_WORK_DIR}" > /dev/null
+zip "${DEPLOY_DIR}/image_${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.zip" \
+	"$(basename "${IMG_FILE}")"
 popd > /dev/null
 
 cp "$INFO_FILE" "$DEPLOY_DIR"
diff --git a/export-image/prerun.sh b/export-image/prerun.sh
index cec133c..0ac7181 100755
--- a/export-image/prerun.sh
+++ b/export-image/prerun.sh
@@ -2,21 +2,22 @@
 
 IMG_FILE="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img"
 
-unmount_image ${IMG_FILE}
+unmount_image "${IMG_FILE}"
 
-rm -f ${IMG_FILE}
+rm -f "${IMG_FILE}"
 
-rm -rf ${ROOTFS_DIR}
-mkdir -p ${ROOTFS_DIR}
+rm -rf "${ROOTFS_DIR}"
+mkdir -p "${ROOTFS_DIR}"
 
-BOOT_SIZE=$(du --apparent-size -s ${EXPORT_ROOTFS_DIR}/boot --block-size=1 | cut -f 1)
-TOTAL_SIZE=$(du --apparent-size -s ${EXPORT_ROOTFS_DIR} --exclude var/cache/apt/archives --block-size=1 | cut -f 1)
+BOOT_SIZE=$(du --apparent-size -s "${EXPORT_ROOTFS_DIR}/boot" --block-size=1 | cut -f 1)
+TOTAL_SIZE=$(du --apparent-size -s "${EXPORT_ROOTFS_DIR}" --exclude var/cache/apt/archives --block-size=1 | cut -f 1)
 
 ROUND_SIZE="$((4 * 1024 * 1024))"
-IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024) + ROUND_SIZE) / ROUND_SIZE * ROUND_SIZE))
+ROUNDED_ROOT_SECTOR=$(((2 * BOOT_SIZE + ROUND_SIZE) / ROUND_SIZE * ROUND_SIZE / 512 + 8192))
+IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024) + ROUND_SIZE - 1) / ROUND_SIZE * ROUND_SIZE))
 
-truncate -s ${IMG_SIZE} ${IMG_FILE}
-fdisk -H 255 -S 63 ${IMG_FILE} <<EOF
+truncate -s "${IMG_SIZE}" "${IMG_FILE}"
+fdisk -H 255 -S 63 "${IMG_FILE}" <<EOF
 o
 n
 
@@ -29,14 +30,14 @@ c
 n
 
 
-8192
+${ROUNDED_ROOT_SECTOR}
 
 
 p
 w
 EOF
 
-PARTED_OUT=$(parted -s ${IMG_FILE} unit b print)
+PARTED_OUT=$(parted -s "${IMG_FILE}" unit b print)
 BOOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^ 1'| xargs echo -n \
 | cut -d" " -f 2 | tr -d B)
 BOOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^ 1'| xargs echo -n \
@@ -47,8 +48,8 @@ ROOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^ 2'| xargs echo -n \
 ROOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^ 2'| xargs echo -n \
 | cut -d" " -f 4 | tr -d B)
 
-BOOT_DEV=$(losetup --show -f -o ${BOOT_OFFSET} --sizelimit ${BOOT_LENGTH} ${IMG_FILE})
-ROOT_DEV=$(losetup --show -f -o ${ROOT_OFFSET} --sizelimit ${ROOT_LENGTH} ${IMG_FILE})
+BOOT_DEV=$(losetup --show -f -o "${BOOT_OFFSET}" --sizelimit "${BOOT_LENGTH}" "${IMG_FILE}")
+ROOT_DEV=$(losetup --show -f -o "${ROOT_OFFSET}" --sizelimit "${ROOT_LENGTH}" "${IMG_FILE}")
 echo "/boot: offset $BOOT_OFFSET, length $BOOT_LENGTH"
 echo "/:     offset $ROOT_OFFSET, length $ROOT_LENGTH"
 
@@ -58,11 +59,11 @@ for FEATURE in metadata_csum 64bit; do
 	    ROOT_FEATURES="^$FEATURE,$ROOT_FEATURES"
 	fi
 done
-mkdosfs -n boot -F 32 -v $BOOT_DEV > /dev/null
-mkfs.ext4 -L rootfs -O $ROOT_FEATURES $ROOT_DEV > /dev/null
+mkdosfs -n boot -F 32 -v "$BOOT_DEV" > /dev/null
+mkfs.ext4 -L rootfs -O "$ROOT_FEATURES" "$ROOT_DEV" > /dev/null
 
-mount -v $ROOT_DEV ${ROOTFS_DIR} -t ext4
-mkdir -p ${ROOTFS_DIR}/boot
-mount -v $BOOT_DEV ${ROOTFS_DIR}/boot -t vfat
+mount -v "$ROOT_DEV" "${ROOTFS_DIR}" -t ext4
+mkdir -p "${ROOTFS_DIR}/boot"
+mount -v "$BOOT_DEV" "${ROOTFS_DIR}/boot" -t vfat
 
-rsync -aHAXx --exclude var/cache/apt/archives ${EXPORT_ROOTFS_DIR}/ ${ROOTFS_DIR}/
+rsync -aHAXx --exclude var/cache/apt/archives "${EXPORT_ROOTFS_DIR}/" "${ROOTFS_DIR}/"
diff --git a/export-noobs/00-release/00-run.sh b/export-noobs/00-release/00-run.sh
index 25f62fd..5874944 100755
--- a/export-noobs/00-release/00-run.sh
+++ b/export-noobs/00-release/00-run.sh
@@ -2,35 +2,35 @@
 
 NOOBS_DIR="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}"
 
-install -v -m 744	files/partition_setup.sh	${NOOBS_DIR}/
-install -v		files/partitions.json		${NOOBS_DIR}/
-install -v		files/os.json			${NOOBS_DIR}/
-install -v		files/OS.png			${NOOBS_DIR}/
-install -v		files/release_notes.txt		${NOOBS_DIR}/
+install -v -m 744	files/partition_setup.sh	"${NOOBS_DIR}/"
+install -v		files/partitions.json		"${NOOBS_DIR}/"
+install -v		files/os.json			"${NOOBS_DIR}/"
+install -v		files/OS.png			"${NOOBS_DIR}/"
+install -v		files/release_notes.txt		"${NOOBS_DIR}/"
 
-tar -v -c -C		files/marketing			-f ${NOOBS_DIR}/marketing.tar .
+tar -v -c -C		files/marketing			-f "${NOOBS_DIR}/marketing.tar" .
 
-BOOT_SIZE=$(xz --robot -l ${NOOBS_DIR}/boot.tar.xz  | grep totals | cut -f 5)
-ROOT_SIZE=$(xz --robot -l ${NOOBS_DIR}/root.tar.xz  | grep totals | cut -f 5)
+BOOT_SIZE="$(xz --robot -l "${NOOBS_DIR}/boot.tar.xz"  | grep totals | cut -f 5)"
+ROOT_SIZE="$(xz --robot -l "${NOOBS_DIR}/root.tar.xz"  | grep totals | cut -f 5)"
 
-BOOT_SIZE=$(expr ${BOOT_SIZE} / 1000000 \+ 1)
-ROOT_SIZE=$(expr ${ROOT_SIZE} / 1000000 \+ 1)
+BOOT_SIZE="$(( BOOT_SIZE / 1000000 + 1))"
+ROOT_SIZE="$(( ROOT_SIZE / 1000000 + 1))"
 
-BOOT_NOM=$(expr ${BOOT_SIZE} \* 3)
-ROOT_NOM=$(expr ${ROOT_SIZE} \+ 400)
+BOOT_NOM="$(( BOOT_SIZE * 3 ))"
+ROOT_NOM="$(( ROOT_SIZE + 400 ))"
 
-mv "${NOOBS_DIR}/OS.png" "${NOOBS_DIR}/$(echo ${NOOBS_NAME} | sed 's/ /_/g').png"
+mv "${NOOBS_DIR}/OS.png" "${NOOBS_DIR}/${NOOBS_NAME// /_}.png"
 
-sed ${NOOBS_DIR}/partitions.json -i -e "s|BOOT_SIZE|${BOOT_SIZE}|"
-sed ${NOOBS_DIR}/partitions.json -i -e "s|ROOT_SIZE|${ROOT_SIZE}|"
+sed "${NOOBS_DIR}/partitions.json" -i -e "s|BOOT_SIZE|${BOOT_SIZE}|"
+sed "${NOOBS_DIR}/partitions.json" -i -e "s|ROOT_SIZE|${ROOT_SIZE}|"
 
-sed ${NOOBS_DIR}/partitions.json -i -e "s|BOOT_NOM|${BOOT_NOM}|"
-sed ${NOOBS_DIR}/partitions.json -i -e "s|ROOT_NOM|${ROOT_NOM}|"
+sed "${NOOBS_DIR}/partitions.json" -i -e "s|BOOT_NOM|${BOOT_NOM}|"
+sed "${NOOBS_DIR}/partitions.json" -i -e "s|ROOT_NOM|${ROOT_NOM}|"
 
-sed ${NOOBS_DIR}/os.json -i -e "s|UNRELEASED|${IMG_DATE}|"
-sed ${NOOBS_DIR}/os.json -i -e "s|NOOBS_NAME|${NOOBS_NAME}|"
-sed ${NOOBS_DIR}/os.json -i -e "s|NOOBS_DESCRIPTION|${NOOBS_DESCRIPTION}|"
+sed "${NOOBS_DIR}/os.json" -i -e "s|UNRELEASED|${IMG_DATE}|"
+sed "${NOOBS_DIR}/os.json" -i -e "s|NOOBS_NAME|${NOOBS_NAME}|"
+sed "${NOOBS_DIR}/os.json" -i -e "s|NOOBS_DESCRIPTION|${NOOBS_DESCRIPTION}|"
 
-sed ${NOOBS_DIR}/release_notes.txt -i -e "s|UNRELEASED|${IMG_DATE}|"
+sed "${NOOBS_DIR}/release_notes.txt" -i -e "s|UNRELEASED|${IMG_DATE}|"
 
-cp -a ${NOOBS_DIR} ${DEPLOY_DIR}/
+cp -a "${NOOBS_DIR}" "${DEPLOY_DIR}/"
diff --git a/export-noobs/00-release/files/os.json b/export-noobs/00-release/files/os.json
index e48dcb8..a37e266 100644
--- a/export-noobs/00-release/files/os.json
+++ b/export-noobs/00-release/files/os.json
@@ -1,7 +1,7 @@
 {
     "description": "NOOBS_DESCRIPTION",
     "feature_level": 35120124,
-    "kernel": "4.9",
+    "kernel": "4.14",
     "name": "NOOBS_NAME",
     "password": "raspberry",
     "release_date": "UNRELEASED",
diff --git a/export-noobs/00-release/files/release_notes.txt b/export-noobs/00-release/files/release_notes.txt
index 2177cfe..1fee949 100644
--- a/export-noobs/00-release/files/release_notes.txt
+++ b/export-noobs/00-release/files/release_notes.txt
@@ -1,4 +1,41 @@
 UNRELEASED:
+  * Fixed race between wifi-country.service and raspberrypi-net-mods.service
+  * Linux kernel 4.14.34+
+  * Raspberry Pi firmware 5db8e4e1c63178e200d6fbea23ed4a9bf4656658
+2018-03-13:
+  * Raspberry Pi 3 B+ support
+  * WiFi is disabled until wireless regulatory domain is set (Pi 3 B+ only)
+    - The domain can be done through 'Raspberry Pi Configuration' (rc_gui),
+      'raspi-config' or by setting 'country=' to an appropriate ISO 3166
+      alpha2 country code in /etc/wpa_supplicant/wpa_supplicant.conf.
+  * Default wireless regulatory domain is now unset
+  * Added support to desktop for different screen sizes and resolutions,
+    including multiple preset options in Appearance Settings and pixel doubling
+    option in Raspberry Pi Configuration
+  * Version 2.1.16 of Thonny included
+  * Version 29.0.0.113 of Adobe PepperFlash player included
+  * Version 1.2.post1 of Pygame Zero included
+  * Bluetooth plugin now supports connection to Bluetooth LE HID devices
+  * Network plugin now indicates 5G-compatible APs
+  * Latest changes to Bluez ALSA service merged
+    - service now started on CLI boot as well as GUI boot
+  * Latest changes to dhcpcd networking plugin merged
+  * Improved support for running on pi-top devices
+  * Small design changes to PiX theme and icons
+  * Bug fix - hide spurious window resize handles
+  * Bug fix - Scratch 2 remote GPIO state block now works correctly
+  * Updated WiFi Firmware
+    - brcmfmac43455-sdio 7.45.154
+    - brcmfmac43430-sdio 7.45.98.38
+  * New packages:
+    - policykit-1
+    - obconf
+    - python-buttonshim python3-buttonshim
+    - python-unicornhathd  python3-unicornhathd
+    - python-pantilthat python3-pantilthat
+  * Linux kernel 4.9.80+
+  * Raspberry Pi firmware 3347884c7df574bbabeff6dca63caf686e629699
+2017-11-29:
   * Added battery monitor plugin for taskbar - works on x86 images or first-generation Pi-Top
   * Added cutdown mode to PCManFM file manager to reduce complexity
   * Added ability to rename files in PCManFM by clicking name when selected
diff --git a/export-noobs/prerun.sh b/export-noobs/prerun.sh
index dafe654..1889567 100755
--- a/export-noobs/prerun.sh
+++ b/export-noobs/prerun.sh
@@ -2,14 +2,14 @@
 
 IMG_FILE="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img"
 NOOBS_DIR="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}"
-unmount_image ${IMG_FILE}
+unmount_image "${IMG_FILE}"
 
-mkdir -p ${STAGE_WORK_DIR}
-cp ${WORK_DIR}/export-image/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img ${STAGE_WORK_DIR}/
+mkdir -p "${STAGE_WORK_DIR}"
+cp "${WORK_DIR}/export-image/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img" "${STAGE_WORK_DIR}/"
 
-rm -rf ${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}
+rm -rf "${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}"
 
-PARTED_OUT=$(parted -s ${IMG_FILE} unit b print)
+PARTED_OUT=$(parted -s "${IMG_FILE}" unit b print)
 BOOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^ 1'| xargs echo -n \
 | cut -d" " -f 2 | tr -d B)
 BOOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^ 1'| xargs echo -n \
@@ -20,21 +20,21 @@ ROOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^ 2'| xargs echo -n \
 ROOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^ 2'| xargs echo -n \
 | cut -d" " -f 4 | tr -d B)
 
-BOOT_DEV=$(losetup --show -f -o ${BOOT_OFFSET} --sizelimit ${BOOT_LENGTH} ${IMG_FILE})
-ROOT_DEV=$(losetup --show -f -o ${ROOT_OFFSET} --sizelimit ${ROOT_LENGTH} ${IMG_FILE})
+BOOT_DEV=$(losetup --show -f -o "${BOOT_OFFSET}" --sizelimit "${BOOT_LENGTH}" "${IMG_FILE}")
+ROOT_DEV=$(losetup --show -f -o "${ROOT_OFFSET}" --sizelimit "${ROOT_LENGTH}" "${IMG_FILE}")
 echo "/boot: offset $BOOT_OFFSET, length $BOOT_LENGTH"
 echo "/:     offset $ROOT_OFFSET, length $ROOT_LENGTH"
 
-mkdir -p ${STAGE_WORK_DIR}/rootfs
-mkdir -p ${NOOBS_DIR}
+mkdir -p "${STAGE_WORK_DIR}/rootfs"
+mkdir -p "${NOOBS_DIR}"
 
-mount $ROOT_DEV ${STAGE_WORK_DIR}/rootfs
-mount $BOOT_DEV ${STAGE_WORK_DIR}/rootfs/boot
+mount "$ROOT_DEV" "${STAGE_WORK_DIR}/rootfs"
+mount "$BOOT_DEV" "${STAGE_WORK_DIR}/rootfs/boot"
 
 ln -sv "/lib/systemd/system/apply_noobs_os_config.service" "$ROOTFS_DIR/etc/systemd/system/multi-user.target.wants/apply_noobs_os_config.service"
 
-bsdtar --numeric-owner --format gnutar --use-compress-program pxz -C ${STAGE_WORK_DIR}/rootfs/boot -cpf ${NOOBS_DIR}/boot.tar.xz .
-umount ${STAGE_WORK_DIR}/rootfs/boot
-bsdtar --numeric-owner --format gnutar --use-compress-program pxz -C ${STAGE_WORK_DIR}/rootfs --one-file-system -cpf ${NOOBS_DIR}/root.tar.xz .
+bsdtar --numeric-owner --format gnutar --use-compress-program pxz -C "${STAGE_WORK_DIR}/rootfs/boot" -cpf "${NOOBS_DIR}/boot.tar.xz" .
+umount "${STAGE_WORK_DIR}/rootfs/boot"
+bsdtar --numeric-owner --format gnutar --use-compress-program pxz -C "${STAGE_WORK_DIR}/rootfs" --one-file-system -cpf "${NOOBS_DIR}/root.tar.xz" .
 
-unmount_image ${IMG_FILE}
+unmount_image "${IMG_FILE}"
diff --git a/scripts/check_deps.sh b/scripts/check_deps.sh
deleted file mode 100755
index e69de29..0000000
diff --git a/scripts/common b/scripts/common
index f18fd89..efd867e 100644
--- a/scripts/common
+++ b/scripts/common
@@ -1,5 +1,5 @@
 log (){
-	date +"[%T] $@" | tee -a "${LOG_FILE}"
+	date +"[%T] $*" | tee -a "${LOG_FILE}"
 }
 export -f log
 
@@ -15,10 +15,10 @@ bootstrap(){
 		local BOOTSTRAP_CMD=debootstrap
 	fi
 
-	capsh --drop=cap_setfcap -- -c "${BOOTSTRAP_CMD} --components=main,contrib,non-free \
+	capsh --drop=cap_setfcap -- "${BOOTSTRAP_CMD}" --components=main,contrib,non-free \
 		--arch armhf \
 		--keyring "${STAGE_DIR}/files/raspberrypi.gpg" \
-		$1 $2 $3" || rmdir "$2/debootstrap"
+		"$1" "$2" "$3" || rmdir "$2/debootstrap"
 }
 export -f bootstrap
 
diff --git a/scripts/dependencies_check b/scripts/dependencies_check
index d649f0c..1b92a9c 100644
--- a/scripts/dependencies_check
+++ b/scripts/dependencies_check
@@ -10,11 +10,11 @@ dependencies_check()
 
 	for depfile in "$@"; do
 		if [[ -e "$depfile" ]]; then
-			deps="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < ${BASE_DIR}/depends)"
+			deps="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < "${BASE_DIR}/depends")"
 
 		fi
 		for dep in $deps; do
-			if ! hash ${dep%:*} 2>/dev/null; then
+			if ! hash "${dep%:*}" 2>/dev/null; then
 				missing="${missing:+$missing }${dep#*:}"
 			fi
 		done
diff --git a/scripts/release.sh b/scripts/release.sh
deleted file mode 100755
index e69de29..0000000
diff --git a/stage0/00-configure-apt/00-run.sh b/stage0/00-configure-apt/00-run.sh
index 7966ef1..9d21ffb 100755
--- a/stage0/00-configure-apt/00-run.sh
+++ b/stage0/00-configure-apt/00-run.sh
@@ -1,13 +1,13 @@
 #!/bin/bash -e
 
-install -m 644 files/sources.list ${ROOTFS_DIR}/etc/apt/
-install -m 644 files/raspi.list ${ROOTFS_DIR}/etc/apt/sources.list.d/
+install -m 644 files/sources.list "${ROOTFS_DIR}/etc/apt/"
+install -m 644 files/raspi.list "${ROOTFS_DIR}/etc/apt/sources.list.d/"
 
 if [ -n "$APT_PROXY" ]; then
-	install -m 644 files/51cache ${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache
-	sed ${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache -i -e "s|APT_PROXY|${APT_PROXY}|"
+	install -m 644 files/51cache "${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache"
+	sed "${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache" -i -e "s|APT_PROXY|${APT_PROXY}|"
 else
-	rm -f ${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache
+	rm -f "${ROOTFS_DIR}/etc/apt/apt.conf.d/51cache"
 fi
 
 on_chroot apt-key add - < files/raspberrypi.gpg.key
diff --git a/stage0/00-configure-apt/files/sources.list b/stage0/00-configure-apt/files/sources.list
index f13c50c..45e5210 100644
--- a/stage0/00-configure-apt/files/sources.list
+++ b/stage0/00-configure-apt/files/sources.list
@@ -1,3 +1,3 @@
-deb http://mirrordirector.raspbian.org/raspbian/ stretch main contrib non-free rpi
+deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
 # Uncomment line below then 'apt-get update' to enable 'apt-get source'
-#deb-src http://archive.raspbian.org/raspbian/ stretch main contrib non-free rpi
+#deb-src http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
diff --git a/stage0/prerun.sh b/stage0/prerun.sh
index 14c09c3..7c09b02 100755
--- a/stage0/prerun.sh
+++ b/stage0/prerun.sh
@@ -1,5 +1,5 @@
 #!/bin/bash -e
 
-if [ ! -d ${ROOTFS_DIR} ]; then
-	bootstrap stretch ${ROOTFS_DIR} http://mirrordirector.raspbian.org/raspbian/
+if [ ! -d "${ROOTFS_DIR}" ]; then
+	bootstrap stretch "${ROOTFS_DIR}" http://raspbian.raspberrypi.org/raspbian/
 fi
diff --git a/stage1/00-boot-files/00-run.sh b/stage1/00-boot-files/00-run.sh
index 2c976a8..bc61397 100755
--- a/stage1/00-boot-files/00-run.sh
+++ b/stage1/00-boot-files/00-run.sh
@@ -1,4 +1,4 @@
 #!/bin/bash -e
 
-install -m 644 files/cmdline.txt ${ROOTFS_DIR}/boot/
-install -m 644 files/config.txt ${ROOTFS_DIR}/boot/
+install -m 644 files/cmdline.txt "${ROOTFS_DIR}/boot/"
+install -m 644 files/config.txt "${ROOTFS_DIR}/boot/"
diff --git a/stage1/01-sys-tweaks/00-run.sh b/stage1/01-sys-tweaks/00-run.sh
index 8758288..c94045a 100755
--- a/stage1/01-sys-tweaks/00-run.sh
+++ b/stage1/01-sys-tweaks/00-run.sh
@@ -1,9 +1,8 @@
 #!/bin/bash -e
 
-install -d ${ROOTFS_DIR}/etc/systemd/system/getty@tty1.service.d
-install -m 644 files/noclear.conf ${ROOTFS_DIR}/etc/systemd/system/getty@tty1.service.d/noclear.conf
-install -m 744 files/policy-rc.d ${ROOTFS_DIR}/usr/sbin/policy-rc.d #TODO: Necessary in systemd?
-install -v -m 644 files/fstab ${ROOTFS_DIR}/etc/fstab
+install -d "${ROOTFS_DIR}/etc/systemd/system/getty@tty1.service.d"
+install -m 644 files/noclear.conf "${ROOTFS_DIR}/etc/systemd/system/getty@tty1.service.d/noclear.conf"
+install -v -m 644 files/fstab "${ROOTFS_DIR}/etc/fstab"
 
 on_chroot << EOF
 echo "root:root" | chpasswd
diff --git a/stage1/01-sys-tweaks/files/policy-rc.d b/stage1/01-sys-tweaks/files/policy-rc.d
deleted file mode 100755
index 1924710..0000000
--- a/stage1/01-sys-tweaks/files/policy-rc.d
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-
-exit 101
diff --git a/stage1/02-net-tweaks/00-run.sh b/stage1/02-net-tweaks/00-run.sh
index 174b9f8..96a1774 100755
--- a/stage1/02-net-tweaks/00-run.sh
+++ b/stage1/02-net-tweaks/00-run.sh
@@ -1,6 +1,6 @@
 #!/bin/bash -e
 
-install -m 644 files/ipv6.conf ${ROOTFS_DIR}/etc/modprobe.d/ipv6.conf
-install -m 644 files/hostname ${ROOTFS_DIR}/etc/hostname
+install -m 644 files/ipv6.conf "${ROOTFS_DIR}/etc/modprobe.d/ipv6.conf"
+install -m 644 files/hostname "${ROOTFS_DIR}/etc/hostname"
 
-ln -sf /dev/null ${ROOTFS_DIR}/etc/systemd/network/99-default.link
+ln -sf /dev/null "${ROOTFS_DIR}/etc/systemd/network/99-default.link"
diff --git a/stage1/prerun.sh b/stage1/prerun.sh
index ebb5d35..9acd13c 100755
--- a/stage1/prerun.sh
+++ b/stage1/prerun.sh
@@ -1,5 +1,5 @@
 #!/bin/bash -e
 
-if [ ! -d ${ROOTFS_DIR} ]; then
+if [ ! -d "${ROOTFS_DIR}" ]; then
 	copy_previous
 fi
diff --git a/stage2/00-copies-and-fills/00-run.sh b/stage2/00-copies-and-fills/00-run.sh
deleted file mode 100755
index 4b3a849..0000000
--- a/stage2/00-copies-and-fills/00-run.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash -e
-
-touch ${ROOTFS_DIR}/spindle_install
diff --git a/stage2/00-copies-and-fills/02-run.sh b/stage2/00-copies-and-fills/02-run.sh
deleted file mode 100755
index c579d6a..0000000
--- a/stage2/00-copies-and-fills/02-run.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash -e
-
-rm -f ${ROOTFS_DIR}/spindle_install
diff --git a/stage2/01-sys-tweaks/01-run.sh b/stage2/01-sys-tweaks/01-run.sh
index 07edf17..ce3615b 100755
--- a/stage2/01-sys-tweaks/01-run.sh
+++ b/stage2/01-sys-tweaks/01-run.sh
@@ -1,15 +1,15 @@
 #!/bin/bash -e
 
-install -m 755 files/resize2fs_once			${ROOTFS_DIR}/etc/init.d/
+install -m 755 files/resize2fs_once	"${ROOTFS_DIR}/etc/init.d/"
 
-install -d						${ROOTFS_DIR}/etc/systemd/system/rc-local.service.d
-install -m 644 files/ttyoutput.conf			${ROOTFS_DIR}/etc/systemd/system/rc-local.service.d/
+install -d				"${ROOTFS_DIR}/etc/systemd/system/rc-local.service.d"
+install -m 644 files/ttyoutput.conf	"${ROOTFS_DIR}/etc/systemd/system/rc-local.service.d/"
 
-install -m 644 files/50raspi				${ROOTFS_DIR}/etc/apt/apt.conf.d/
+install -m 644 files/50raspi		"${ROOTFS_DIR}/etc/apt/apt.conf.d/"
 
-install -m 644 files/console-setup   			${ROOTFS_DIR}/etc/default/
+install -m 644 files/console-setup   	"${ROOTFS_DIR}/etc/default/"
 
-install -m 755 files/rc.local				${ROOTFS_DIR}/etc/
+install -m 755 files/rc.local		"${ROOTFS_DIR}/etc/"
 
 on_chroot << EOF
 systemctl disable hwclock.sh
@@ -21,15 +21,7 @@ EOF
 
 if [ "${USE_QEMU}" = "1" ]; then
 	echo "enter QEMU mode"
-	install -m 644 files/90-qemu.rules		${ROOTFS_DIR}/etc/udev/rules.d/
-	if [ -e ${ROOTFS_DIR}/etc/ld.so.preload.disabled ]; then
-		rm ${ROOTFS_DIR}/etc/ld.so.preload.disabled
-		touch ${ROOTFS_DIR}/etc/ld.so.preload.disabled
-	fi
-	if [ -e ${ROOTFS_DIR}/etc/ld.so.preload ]; then
-		rm ${ROOTFS_DIR}/etc/ld.so.preload
-		touch ${ROOTFS_DIR}/etc/ld.so.preload
-	fi
+	install -m 644 files/90-qemu.rules "${ROOTFS_DIR}/etc/udev/rules.d/"
 	on_chroot << EOF
 systemctl disable resize2fs_once
 EOF
@@ -42,7 +34,7 @@ fi
 
 on_chroot << \EOF
 for GRP in input spi i2c gpio; do
-	groupadd -f -r $GRP
+	groupadd -f -r "$GRP"
 done
 EOF
 
@@ -54,7 +46,7 @@ on_chroot << EOF
 usermod --pass='*' root
 EOF
 
-rm -f ${ROOTFS_DIR}/etc/ssh/ssh_host_*_key*
+rm -f "${ROOTFS_DIR}/etc/ssh/"ssh_host_*_key*
 
 
 # Dirty hack, ... otherwise the build script says in the next step that it cant
diff --git a/stage2/02-net-tweaks/01-run.sh b/stage2/02-net-tweaks/01-run.sh
index a96b556..d21419e 100755
--- a/stage2/02-net-tweaks/01-run.sh
+++ b/stage2/02-net-tweaks/01-run.sh
@@ -1,8 +1,8 @@
 #!/bin/bash -e
 
-install -v -d						${ROOTFS_DIR}/etc/systemd/system/dhcpcd.service.d
-install -v -m 644 files/wait.conf			${ROOTFS_DIR}/etc/systemd/system/dhcpcd.service.d/
+install -v -d					"${ROOTFS_DIR}/etc/systemd/system/dhcpcd.service.d"
+install -v -m 644 files/wait.conf		"${ROOTFS_DIR}/etc/systemd/system/dhcpcd.service.d/"
 
-install -v -d                                           ${ROOTFS_DIR}/etc/wpa_supplicant
-install -v -m 600 files/wpa_supplicant.conf             ${ROOTFS_DIR}/etc/wpa_supplicant/
+install -v -d					"${ROOTFS_DIR}/etc/wpa_supplicant"
+install -v -m 600 files/wpa_supplicant.conf	"${ROOTFS_DIR}/etc/wpa_supplicant/"
 
diff --git a/stage2/02-net-tweaks/files/wpa_supplicant.conf b/stage2/02-net-tweaks/files/wpa_supplicant.conf
index c58b871..0fc335e 100644
--- a/stage2/02-net-tweaks/files/wpa_supplicant.conf
+++ b/stage2/02-net-tweaks/files/wpa_supplicant.conf
@@ -1,3 +1,2 @@
-country=GB
 ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
 update_config=1
diff --git a/stage2/prerun.sh b/stage2/prerun.sh
index ebb5d35..9acd13c 100755
--- a/stage2/prerun.sh
+++ b/stage2/prerun.sh
@@ -1,5 +1,5 @@
 #!/bin/bash -e
 
-if [ ! -d ${ROOTFS_DIR} ]; then
+if [ ! -d "${ROOTFS_DIR}" ]; then
 	copy_previous
 fi
diff --git a/stage3/prerun.sh b/stage3/prerun.sh
index ebb5d35..9acd13c 100755
--- a/stage3/prerun.sh
+++ b/stage3/prerun.sh
@@ -1,5 +1,5 @@
 #!/bin/bash -e
 
-if [ ! -d ${ROOTFS_DIR} ]; then
+if [ ! -d "${ROOTFS_DIR}" ]; then
 	copy_previous
 fi