X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=scripts%2Flive-helpers;h=75fc10648e1969b8e22d716d3ec8cb2e1688fb37;hb=2d129205223e1fb6322bb03a9cb9fdf1736885b8;hp=9282df6250b993edad0d2442b468c59fa5a134bb;hpb=aa2f9a8dff5be9a2a41cc7af053821d5afab0478;p=live-boot-grml.git

diff --git a/scripts/live-helpers b/scripts/live-helpers
index 9282df6..75fc106 100644
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -16,8 +16,11 @@ else
 fi
 
 root_overlay_label="full-ov"
+old_root_overlay_label="live-rw"
+old_home_overlay_label="home-rw"
 custom_overlay_label="custom-ov"
 root_snapshot_label="live-sn"
+old_root_snapshot_label="live-sn"
 home_snapshot_label="home-sn"
 persistence_list="live.persist"
 
@@ -254,8 +257,11 @@ Arguments ()
 
 			persistent-subtext=*)
 				root_overlay_label="${root_overlay_label}-${ARGUMENT#persistent-subtext=}"
+				old_root_overlay_label="${old_root_overlay_label}-${ARGUMENT#persistent-subtext=}"
+				old_home_overlay_label="${old_home_overlay_label}-${ARGUMENT#persistent-subtext=}"
 				custom_overlay_label="${custom_overlay_label}-${ARGUMENT#persistent-subtext=}"
 				root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistent-subtext=}"
+				old_root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistent-subtext=}"
 				home_snapshot_label="${home_snapshot_label}-${ARGUMENT#persistent-subtext=}"
 				;;
 
@@ -508,12 +514,20 @@ get_fstype ()
 where_is_mounted ()
 {
 	device=${1}
+	# return first found
+	grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
+}
 
-	if grep -q "^${device} " /proc/mounts
-	then
-		# return the first found
-		grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
-	fi
+trim_path () {
+    # remove all unnecessary /:s in the path, including last one (except
+    # if path is just "/")
+    echo ${1} | sed 's|//\+|/|g' | sed 's|^\(.*[^/]\)/$|\1|'
+}
+
+what_is_mounted_on ()
+{
+	local dir="$(trim_path ${1})"
+	grep -m1 "^[^ ]\+ ${dir} " /proc/mounts | cut -d' ' -f1
 }
 
 lastline ()
@@ -705,6 +719,68 @@ try_mount ()
 	fi
 }
 
+mount_persistent_media ()
+{
+	local device=${1}
+	local backing=""
+
+	# We can't mount into ${rootmnt}/live before ${rootmnt} has been
+	# mounted since that would cover our mountpoint.
+	if [ -n "${rootmnt}" ] && [ -z "$(what_is_mounted_on ${rootmnt})" ]
+	then
+		backing="/$(basename ${device})-backing"
+	else
+		backing="${rootmnt}/live/persistent/$(basename ${device})"
+	fi
+
+	mkdir -p "${backing}"
+	local old_backing="$(where_is_mounted ${device})"
+	if [ -z "${old_backing}" ]
+	then
+		local fstype="$(get_fstype ${device})"
+		local mount_opts="rw,noatime"
+		if [ -n "${PERSISTENT_READONLY}" ]
+		then
+			mount_opts="ro,noatime"
+		fi
+		if mount -t "${fstype}" -o "${mount_opts}" "${device}" "${backing}" >/dev/null
+		then
+			echo ${backing}
+			return 0
+		else
+			log_warning_msg "Failed to mount persistent media ${device}"
+			return 1
+		fi
+	elif [ "${backing}" != "${old_backing}" ]
+	then
+		if mount --move ${old_backing} ${backing} >/dev/null
+		then
+			echo ${backing}
+			return 0
+		else
+			log_warning_msg "Failed to move persistent media ${device}"
+			return 1
+		fi
+	fi
+	return 0
+}
+
+close_persistent_media () {
+	local device=${1}
+	local backing="$(where_is_mounted ${device})"
+
+	if [ -d "${backing}" ]
+	then
+		umount "${backing}" >/dev/null 2>&1
+		rmdir "${backing}" >/dev/null 2>&1
+	fi
+
+	if is_active_luks_mapping ${device}
+	then
+		/sbin/cryptsetup luksClose ${device}
+	fi
+}
+
 open_luks_device ()
 {
 	dev="${1}"
@@ -715,6 +791,21 @@ open_luks_device ()
 		opts="${opts} --readonly"
 	fi
 
+	if /sbin/cryptsetup status "${name}" >/dev/null 2>&1
+	then
+		re="^[[:space:]]*device:[[:space:]]*\([^[:space:]]*\)$"
+		opened_dev=$(cryptsetup status ${name} 2>/dev/null | grep "${re}" | sed "s|${re}|\1|")
+		if [ "${opened_dev}" = "${dev}" ]
+		then
+			luks_device="/dev/mapper/${name}"
+			echo ${luks_device}
+			return 0
+		else
+			log_warning_msg "Cannot open luks device ${dev} since ${opened_dev} already is opened with its name"
+			return 1
+		fi
+	fi
+
 	load_keymap
 
 	while true
@@ -740,6 +831,104 @@ open_luks_device ()
 	done
 }
 
+get_gpt_name ()
+{
+    local dev="${1}"
+    /sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
+}
+
+is_gpt_device ()
+{
+    local dev="${1}"
+    [ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
+}
+
+probe_for_gpt_name ()
+{
+	local overlays="${1}"
+	local snapshots="${2}"
+	local dev="${3}"
+
+	local gpt_dev="${dev}"
+	if is_active_luks_mapping ${dev}
+	then
+		# if $dev is an opened luks device, we need to check
+		# GPT stuff on the backing device
+		gpt_dev=$(get_luks_backing_device "${dev}")
+	fi
+
+	if ! is_gpt_device ${gpt_dev}
+	then
+		return
+	fi
+
+	local gpt_name=$(get_gpt_name ${gpt_dev})
+	for label in ${overlays} ${snapshots}
+	do
+		if [ "${gpt_name}" = "${label}" ]
+		then
+			echo "${label}=${dev}"
+		fi
+	done
+}
+
+probe_for_fs_label ()
+{
+	local overlays="${1}"
+	local snapshots="${2}"
+	local dev="${3}"
+
+	for label in ${overlays} ${snapshots}
+	do
+		if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
+		then
+			echo "${label}=${dev}"
+		fi
+	done
+}
+
+probe_for_file_name ()
+{
+	local overlays="${1}"
+	local snapshots="${2}"
+	local dev="${3}"
+
+	local ret=""
+	local backing="$(mount_persistent_media ${dev})"
+	if [ -z "${backing}" ]
+	then
+	    return
+	fi
+
+	for label in ${overlays}
+	do
+		path=${backing}/${PERSISTENT_PATH}${label}
+		if [ -f "${path}" ]
+		then
+			local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
+			ret="${ret} ${label}=${loopdev}"
+		fi
+	done
+	for label in ${snapshots}
+	do
+		for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
+		do
+			path="${PERSISTENT_PATH}${label}.${ext}"
+			if [ -f "${backing}/${path}" ]
+			then
+				ret="${ret} ${label}=${dev}:${backing}:${path}"
+			fi
+		done
+	done
+
+	if [ -n "${ret}" ]
+	then
+		echo ${ret}
+	else
+		umount ${backing} > /dev/null 2>&1 || true
+	fi
+}
+
 find_persistent_media ()
 {
 	# Scans devices for overlays and snapshots, and returns a whitespace
@@ -763,19 +952,22 @@ find_persistent_media ()
 	# ${white_list_devices} is non-empty, only devices in it will be
 	# scanned.
 
-	overlays="${1}"
-	snapshots="${2}"
-	black_listed_devices="${3}"
-	white_listed_devices="${4}"
-	persistent_backing="${rootmnt}/live/persistent"
+	local overlays="${1}"
+	local snapshots="${2}"
+	local white_listed_devices="${3}"
+	local ret=""
 
-	for dev in $(storage_devices "${black_listed_devices}" "${white_listed_devices}")
+	for dev in $(storage_devices "" "${white_listed_devices}")
 	do
-		luks_device=""
+		local result=""
 
-		# Checking for a luks device
+		local luks_device=""
+		# Check if it's a luks device; we'll have to open the device
+		# in order to probe any filesystem it contains, like we do
+		# below. activate_custom_mounts() also depends on that any luks
+		# device already has been opened.
 		if echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
-		   /sbin/cryptsetup isLuks ${dev}
+		   is_luks_partition ${dev}
 		then
 			if luks_device=$(open_luks_device "${dev}")
 			then
@@ -790,63 +982,47 @@ find_persistent_media ()
 			continue
 		fi
 
+		# Probe for matching GPT partition names or filesystem labels
 		if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
 		then
-			for label in ${overlays} ${snapshots}
-			do
-				if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
-				then
-					echo "${label}=${dev}"
-					# skip to the next device
-					continue 2
-				fi
-			done
+			result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${dev})
+			if [ -n "${result}" ]
+			then
+				ret="${ret} ${result}"
+				continue
+			fi
+
+			result=$(probe_for_fs_label "${overlays}" "${snapshots}" ${dev})
+			if [ -n "${result}" ]
+			then
+				ret="${ret} ${result}"
+				continue
+			fi
 		fi
 
-		overlay_on_dev=""
-		snapshot_on_dev=""
+		# Probe for files with matching name on mounted partition
 		if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
 		then
-			devfstype="$(get_fstype ${dev})"
-			backing="${persistent_backing}/$(basename ${dev})"
-			mkdir -p "${backing}"
-			if is_supported_fs ${devfstype} && try_mount "${dev}" "${backing}" "rw" "${devfstype}"
-			then
-				for label in ${overlays}
-				do
-					path=${backing}/${PERSISTENT_PATH}${label}
-					if [ -f "${path}" ]
-					then
-						overlay_on_dev="yes"
-						echo "${label}=$(setup_loop "${path}" "loop" "/sys/block/loop*")"
-					fi
-				done
-
-				for label in ${snapshots}
-				do
-					for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
-					do
-						path="${PERSISTENT_PATH}${label}.${ext}"
-						if [ -f "${backing}/${path}" ]
-						then
-							snapshot_on_dev="yes"
-							echo "${label}=${dev}:${backing}:${path}"
-						fi
-					done
-				done
-			fi
-			if [ -z "${overlay_on_dev}" ] && [ -z "${snapshot_on_dev}" ]
+			result=$(probe_for_file_name "${overlays}" "${snapshots}" ${dev})
+			if [ -n "${result}" ]
 			then
-				umount ${backing} > /dev/null 2>&1 || true
+				ret="${ret} ${result}"
+				continue
 			fi
 		fi
-		if [ -z "${overlay_on_dev}" ] && [ -z "${snapshot_on_dev}" ] && \
-		   [ -n "${luks_device}" ] && \
-		   /sbin/cryptsetup status "${luks_device}" 1> /dev/null 2>&1
+
+		# Close luks device if it isn't used
+		if [ -z "${result}" ] && [ -n "${luks_device}" ] && \
+		   is_active_luks_mapping "${luks_device}"
 		then
 			/sbin/cryptsetup luksClose "${luks_device}"
 		fi
 	done
+
+	if [ -n "${ret}" ]
+	then
+		echo ${ret}
+	fi
 }
 
 get_mac ()
@@ -867,17 +1043,22 @@ get_mac ()
 	echo ${mac}
 }
 
-is_luks()
+is_luks_partition ()
 {
-    devname="${1}"
-    if [ -x /sbin/cryptsetup ]
-    then
-	/sbin/cryptsetup isLuks "${devname}" 2>/dev/null || ret=${?}
-	return ${ret}
-    else
-	return 1
-    fi
+	device="${1}"
+	/sbin/cryptsetup isLuks "${device}" 1>/dev/null 2>&1
+}
 
+is_active_luks_mapping ()
+{
+	device="${1}"
+	/sbin/cryptsetup status "${device}" 1>/dev/null 2>&1
+}
+
+get_luks_backing_device () {
+	device=${1}
+	cryptsetup status ${device} 2> /dev/null | \
+		awk '{if ($1 == "device:") print $2}'
 }
 
 removable_dev ()
@@ -965,27 +1146,26 @@ link_files ()
 
 	# This check can only trigger on the inital, non-recursive call since
 	# we create the destination before recursive calls
-	if [ ! -d "${dest_dir}" ];
+	if [ ! -d "${dest_dir}" ]
 	then
 		log_warning_msg "Must link_files into a directory"
 		return
 	fi
 
-	find "${src_dir}" -mindepth 1 -maxdepth 1 | while read x; do
-		local src="${x}"
-		local dest="${dest_dir}$(basename "${x}")"
-		if [ -d "${src}" ];
+	find "${src_dir}" -mindepth 1 -maxdepth 1 | while read src; do
+		local dest="${dest_dir}$(basename "${src}")"
+		if [ -d "${src}" ]
 		then
-			if [ -z "$(ls -A "${src}")" ];
+			if [ -z "$(ls -A "${src}")" ]
 			then
 				continue
 			fi
-			if [ ! -d "${dest}" ];
+			if [ ! -d "${dest}" ]
 			then
 				mkdir -p "${dest}"
 				prev="$(dirname "${dest}")"
-				chown $(stat -c %u:%g "${prev}") "${dest}"
-				chmod $(stat -c %a "${prev}") "${dest}"
+				chown --reference "${prev}" "${dest}"
+				chmod --reference "${prev}" "${dest}"
 			fi
 			link_files "${src}" "${dest}" "${src_mask}"
 		else
@@ -999,7 +1179,8 @@ link_files ()
 	done
 }
 
-do_union () {
+do_union ()
+{
 	local unionmountpoint="${1}"	# directory where the union is mounted
 	local unionrw="${2}"		# branch where the union changes are stored
 	local unionro1="${3}"		# first underlying read-only branch (optional)
@@ -1059,18 +1240,18 @@ do_union () {
 	esac
 }
 
-get_custom_mounts () {
+get_custom_mounts ()
+{
 	# Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistent
 	# Side-effect: prints info to file $custom_mounts
 
-	local devices="${1}"
-	local custom_mounts="${2}" # print result to this file
-	local rootmnt="${3}"       # should be set empty post-live-boot
+	local custom_mounts=${1}
+	shift
+	local devices=${@}
 
-	local bindings="/bindings.list"
-	local links="/links.list"
+	local bindings="/tmp/bindings.list"
+	local links="/tmp/links.list"
 	rm -rf ${bindings} ${links} 2> /dev/null
-	local persistent_backing="${rootmnt}/live/persistent"
 
 	for device in ${devices}
 	do
@@ -1078,55 +1259,51 @@ get_custom_mounts () {
 		then
 			continue
 		fi
+
 		local device_name="$(basename ${device})"
-		local backing="${persistent_backing}/${device_name}"
-		mkdir -p "${backing}"
-		local device_fstype="$(get_fstype ${device})"
-		if [ -z "${PERSISTENT_READONLY}" ]
+		local backing=$(mount_persistent_media ${device})
+		if [ -z "${backing}" ]
 		then
-			device_mount_opts="rw,noatime"
-		else
-			device_mount_opts="ro,noatime"
+			continue
 		fi
-		local device_used=""
-		mount -t "${device_fstype}" -o "${device_mount_opts}" "${device}" "${backing}"
+
 		local include_list="${backing}/${persistence_list}"
 		if [ ! -r "${include_list}" ]
 		then
-			umount "${backing}"
-			rmdir "${backing}"
 			continue
 		fi
 
-		[ "${DEBUG}" = "Yes" ] && cp ${include_list} ${persistent_backing}/${persistence_list}.${device_name}
-		while read source dest options # < ${include_list}
+		if [ -n "${DEBUG}" ] && [ -e "${include_list}" ]
+		then
+			cp ${include_list} ${rootmnt}/live/persistent/${persistence_list}.${device_name}
+		fi
+
+		while read dir options # < ${include_list}
 		do
-			if echo ${source} | grep -qe "^[[:space:]]*\(#.*\)\?$"
+			if echo ${dir} | grep -qe "^[[:space:]]*\(#.*\)\?$"
 			then
 				# skipping empty or commented lines
 				continue
 			fi
 
-			if echo ${dest} | grep -qe "^[^/]"
+			if trim_path ${dir} | grep -q -e "^[^/]" -e "^/$" -e "^/live\(/.*\)\?$" -e "^/\(.*/\)\?\.\.\?\(/.*\)\?$"
 			then
-				options="${dest}"
-				dest="${source}"
-			elif [ -z "${dest}" ]
-			then
-				dest="${source}"
-			fi
-
-			if echo ${dest} | grep -qe "^/\+$\|^/\+live\(/.*\)\?$"
-			then
-				# mounting on / or /live could cause trouble
-				log_warning_msg "Skipping unsafe custom mount on ${dest}"
+				log_warning_msg "Skipping unsafe custom mount ${dir}: must be an absolute path containing neither the \".\" nor \"..\" special dirs, and cannot be \"/live\" (or any sub-directory therein) or \"/\" (for the latter, use ${root_overlay_label}-type persistence)"
 				continue
 			fi
 
+			local opt_source=""
+			local opt_linkfiles=""
 			for opt in $(echo ${options} | tr ',' ' ');
 			do
 				case "${opt}" in
-					linkfiles|union)
+					source=*)
+						opt_source=${opt#source=}
+						;;
+					linkfiles)
+						opt_linkfiles="yes"
+						;;
+					union)
 						;;
 					*)
 						log_warning_msg "Skipping custom mount with unkown option: ${opt}"
@@ -1135,56 +1312,45 @@ get_custom_mounts () {
 				esac
 			done
 
-			# FIXME: handle case: we already have /a/b in
-			# $bindings added from current $device, but
-			# now we find /a -- /a should replace /a/b in
-			# $bindings.
-
-			# FIXME: handle case: we have /a in $bindings
-			# from current $device, now we find /a/b, so
-			# we skip /a/b
+			local source="${dir}"
+			if [ -n "${opt_source}" ]
+			then
+				if echo ${opt_source} | grep -q -e "^/" -e "^\(.*/\)\?\.\.\?\(/.*\)\?$" && [ "${source}" != "." ]
+				then
+					log_warning_msg "Skipping unsafe custom mount with option source=${opt_source}: must be either \".\" (the media root) a relative path w.r.t. the media root that doesn't contain comas or the special dirs \".\" and \"..\""
+					continue
+				else
+					source="${opt_source}"
+				fi
+			fi
 
-			# ensure that no multiple-/ occur in paths
-			local full_source="$(echo ${backing}/${source}/ | sed -e 's|/\+|/|g')"
-			local full_dest="$(echo ${rootmnt}/${dest}/ | sed -e 's|/\+|/|g')"
-			device_used="yes"
-			if echo ${options} | grep -qe "\<linkfiles\>";
+			local full_source="$(trim_path ${backing}/${source})"
+			local full_dest="$(trim_path ${rootmnt}/${dir})"
+			if [ -n "${opt_linkfiles}" ]
 			then
-				echo "${full_source} ${full_dest} ${options}" >> ${links}
+				echo "${device} ${full_source} ${full_dest} ${options}" >> ${links}
 			else
-				echo "${full_source} ${full_dest} ${options}" >> ${bindings}
+				echo "${device} ${full_source} ${full_dest} ${options}" >> ${bindings}
 			fi
 		done < ${include_list}
-
-		if [ -z "${device_used}" ]
-		then
-			# this device was not used for / earlier, or
-			# custom mount point now, so it's useless
-			umount "${backing}"
-			rmdir "${backing}"
-		fi
 	done
 
 	# We sort the list according to destination so we're sure that
 	# we won't hide a previous mount. We also ignore duplicate
 	# destinations in a more or less arbitrary way.
-	[ -e "${bindings}" ] && sort -k2 -sbu ${bindings} >> ${custom_mounts}
-	rm ${bindings}
+	[ -e "${bindings}" ] && sort -k3 -sbu ${bindings} >> ${custom_mounts} && rm ${bindings}
 
 	# After all mounts are considered we add symlinks so they
 	# won't be hidden by some mount.
-	[ -e "${links}" ] && sort -k2 -sbu ${links} >> ${custom_mounts}
-	rm ${links}
-
-	rm -f ${bindings} ${links} 2> /dev/null
-	echo ${custom_mounts}
+	[ -e "${links}" ] && sort -k3 -sbu ${links} >> ${custom_mounts} && rm ${links}
 }
 
-do_custom_mounts () {
+activate_custom_mounts ()
+{
 	local custom_mounts="${1}" # the ouput from get_custom_mounts()
-	local rootmnt="${2}"       # should be set empty post-live-boot
+	local used_devices=""
 
-	while read source dest options # < ${custom_mounts}
+	while read device source dest options # < ${custom_mounts}
 	do
 		local opt_linkfiles=""
 		local opt_union=""
@@ -1200,9 +1366,14 @@ do_custom_mounts () {
 			esac
 		done
 
-		if mountpoint -q "${dest}";
+		if [ -n "${opt_linkfiles}" ] && [ -n "${opt_union}" ]
+		then
+			log_warning_msg "Skipping custom mount ${dest} with options ${options}: \"linkfiles\" and \"union\" are mutually exclusive options"
+		fi
+
+		if [ -n "$(what_is_mounted_on "${dest}")" ]
 		then
-			log_warning_msg "Skipping custom mount ${source} on ${dest}: destination is already a mount point"
+			log_warning_msg "Skipping custom mount ${dest}: $(what_is_mounted_on "${dest}") is already mounted there"
 			continue
 		fi
 
@@ -1217,7 +1388,7 @@ do_custom_mounts () {
 			# FIXME: this should really be handled by
 			# live-config since we don't know for sure
 			# which uid a certain user has until then
-			if echo ${dest} | grep -qe "^${rootmnt}/*home/\+[^/]\+"
+			if trim_path ${dest} | grep -qe "^${rootmnt}/*home/[^/]\+"
 			then
 				path="/"
 				for dir in $(echo ${dest} | sed -e 's|/\+| |g')
@@ -1241,13 +1412,16 @@ do_custom_mounts () {
 		# dealing with /etc or other system dir.
 		if [ ! -d "${source}" ]
 		then
-			if [ -n "${PERSISTENT_READONLY}" ] || [ -n "${opt_linkfiles}" ]
+			if [ -n "${PERSISTENT_READONLY}" ]
 			then
 				continue
-			elif [ -n "${opt_union}" ]
+			elif [ -n "${opt_union}" ] || [ -n "${opt_linkfiles}" ]
 			then
-				# union's don't need to be bootstrapped
+				# unions and don't need to be bootstrapped
+				# linkfiles dirs can't be bootstrapped in a sensible way
 				mkdir "${source}"
+				chown --reference "${dest}" "${source}"
+				chmod --reference "${dest}" "${source}"
 			else
 				# ensure that $dest is not copied *into* $source
 				mkdir -p "$(dirname ${source})"
@@ -1255,6 +1429,8 @@ do_custom_mounts () {
 			fi
 		fi
 
+		# XXX: If CONFIG_AUFS_ROBR is added to the Debian kernel we can
+		# ignore the loop below and set rofs_dest_backing=$dest
 		rofs_dest_backing=""
 		for d in ${rootmnt}/live/rofs/*
 		do
@@ -1263,7 +1439,6 @@ do_custom_mounts () {
 				rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
 			else
 				rofs_dest_backing="${d}/${dest}"
-
 			fi
 			if [ -d "${rofs_dest_backing}" ]
 			then
@@ -1299,6 +1474,8 @@ do_custom_mounts () {
 				cow_dir="/live/cow/${dest}"
 			fi
 			mkdir -p ${cow_dir}
+			chown --reference "${source}" "${cow_dir}"
+			chmod --reference "${source}" "${cow_dir}"
 			do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
 		fi
 
@@ -1309,5 +1486,35 @@ do_custom_mounts () {
 
 		PERSISTENCE_IS_ON="1"
 		export PERSISTENCE_IS_ON
+
+		if echo ${used_devices} | grep -qve "^\(.* \)\?${device}\( .*\)\?$"
+		then
+			used_devices="${used_devices} ${device}"
+		fi
 	done < ${custom_mounts}
+
+	echo ${used_devices}
+}
+
+fix_home_rw_compatibility ()
+{
+	local device=${1}
+
+	if [ -n "${PERSISTENT_READONLY}" ]
+	then
+		return
+	fi
+
+	local backing="$(mount_persistent_media ${device})"
+	if [ -z "${backing}" ]
+	then
+		return
+	fi
+
+	local include_list="${backing}/${persistence_list}"
+	if [ ! -r "${include_list}" ]
+	then
+		echo "# home-rw backwards compatibility:
+/home source=." > "${include_list}"
+	fi
 }