X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=scripts%2Flive-helpers;h=40058e92cad5dbfdd04059e4ec14408a3da35574;hb=4e54d60d7f69ae3441e519e5611bd7ea48a8be19;hp=ce2874236f1f5a8dbed7b4622eb1799fa3c02347;hpb=395a2b5f13edc3c3d39a414c403ed317711e9d1b;p=live-boot-grml.git

diff --git a/scripts/live-helpers b/scripts/live-helpers
index ce28742..40058e9 100644
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -89,9 +89,9 @@ Arguments ()
 				export FETCH
 				;;
 
-			forcepersistentfsck)
-				FORCEPERSISTENTFSCK="Yes"
-				export FORCEPERSISTENTFSCK
+			forcepersistencefsck)
+				FORCEPERSISTENCEFSCK="Yes"
+				export FORCEPERSISTENCEFSCK
 				;;
 
 			ftpfs=*)
@@ -188,8 +188,8 @@ Arguments ()
 				export NFSOPTS
 				;;
 
-			nfscow=*)
-				NFS_COW="${ARGUMENT#nfscow=}"
+			nfsoverlay=*)
+				NFS_COW="${ARGUMENT#nfsoverlay=}"
 				export NFS_COW
 				;;
 
@@ -222,52 +222,52 @@ Arguments ()
 				export SWAPON
 				;;
 
-			persistent)
-				PERSISTENT="Yes"
-				export PERSISTENT
+			persistence)
+				PERSISTENCE="Yes"
+				export PERSISTENCE
 				;;
 
-			persistent-encryption=*)
-				PERSISTENT_ENCRYPTION="${ARGUMENT#*=}"
-				export PERSISTENT_ENCRYPTION
+			persistence-encryption=*)
+				PERSISTENCE_ENCRYPTION="${ARGUMENT#*=}"
+				export PERSISTENCE_ENCRYPTION
 				;;
 
-			persistent-media=*)
-				PERSISTENT_MEDIA="${ARGUMENT#*=}"
-				export PERSISTENT_MEDIA
+			persistence-media=*)
+				PERSISTENCE_MEDIA="${ARGUMENT#*=}"
+				export PERSISTENCE_MEDIA
 				;;
-			persistent-method=*)
-				PERSISTENT_METHOD="${ARGUMENT#*=}"
-				export PERSISTENT_METHOD
+			persistence-method=*)
+				PERSISTENCE_METHOD="${ARGUMENT#*=}"
+				export PERSISTENCE_METHOD
 				;;
 
-			persistent-path=*)
-				PERSISTENT_PATH="${ARGUMENT#persistent-path=}"
-				export PERSISTENT_PATH
+			persistence-path=*)
+				PERSISTENCE_PATH="${ARGUMENT#persistence-path=}"
+				export PERSISTENCE_PATH
 				;;
-			persistent-read-only)
-				PERSISTENT_READONLY="Yes"
-				export PERSISTENT_READONLY
+			persistence-read-only)
+				PERSISTENCE_READONLY="Yes"
+				export PERSISTENCE_READONLY
 				;;
 
-			persistent-storage=*)
-				PERSISTENT_STORAGE="${ARGUMENT#persistent-storage=}"
-				export PERSISTENT_STORAGE
+			persistence-storage=*)
+				PERSISTENCE_STORAGE="${ARGUMENT#persistence-storage=}"
+				export PERSISTENCE_STORAGE
 				;;
 
-			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=}"
+			persistence-subtext=*)
+				root_overlay_label="${root_overlay_label}-${ARGUMENT#persistence-subtext=}"
+				old_root_overlay_label="${old_root_overlay_label}-${ARGUMENT#persistence-subtext=}"
+				old_home_overlay_label="${old_home_overlay_label}-${ARGUMENT#persistence-subtext=}"
+				custom_overlay_label="${custom_overlay_label}-${ARGUMENT#persistence-subtext=}"
+				root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistence-subtext=}"
+				old_root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistence-subtext=}"
+				home_snapshot_label="${home_snapshot_label}-${ARGUMENT#persistence-subtext=}"
 				;;
 
-			nopersistent)
-				NOPERSISTENT="Yes"
-				export NOPERSISTENT
+			nopersistence)
+				NOPERSISTENCE="Yes"
+				export NOPERSISTENCE
 				;;
 
 			noprompt)
@@ -381,37 +381,37 @@ Arguments ()
 		export UNIONTYPE
 	fi
 
-	if [ -z "${PERSISTENT_ENCRYPTION}" ]
+	if [ -z "${PERSISTENCE_ENCRYPTION}" ]
 	then
-		PERSISTENT_ENCRYPTION="none"
-		export PERSISTENT_ENCRYPTION
-	elif echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>"
+		PERSISTENCE_ENCRYPTION="none"
+		export PERSISTENCE_ENCRYPTION
+	elif echo ${PERSISTENCE_ENCRYPTION} | grep -qe "\<luks\>"
 	then
 		if ! modprobe dm-crypt
 		then
 			log_warning_msg "Unable to load module dm-crypt"
-			PERSISTENT_ENCRYPTION=$(echo ${PERSISTENT_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
-			export PERSISTENT_ENCRYPTION
+			PERSISTENCE_ENCRYPTION=$(echo ${PERSISTENCE_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
+			export PERSISTENCE_ENCRYPTION
 		fi
 
 		if [ ! -x /lib/cryptsetup/askpass ] || [ ! -x /sbin/cryptsetup ]
 		then
 			log_warning_msg "cryptsetup in unavailable"
-			PERSISTENT_ENCRYPTION=$(echo ${PERSISTENT_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
-			export PERSISTENT_ENCRYPTION
+			PERSISTENCE_ENCRYPTION=$(echo ${PERSISTENCE_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
+			export PERSISTENCE_ENCRYPTION
 		fi
 	fi
 
-	if [ -z "${PERSISTENT_METHOD}" ]
+	if [ -z "${PERSISTENCE_METHOD}" ]
 	then
-		PERSISTENT_METHOD="snapshot,overlay"
-		export PERSISTENT_METHOD
+		PERSISTENCE_METHOD="snapshot,overlay"
+		export PERSISTENCE_METHOD
 	fi
 
-	if [ -z "${PERSISTENT_STORAGE}" ]
+	if [ -z "${PERSISTENCE_STORAGE}" ]
 	then
-		PERSISTENT_STORAGE="filesystem,file"
-		export PERSISTENT_STORAGE
+		PERSISTENCE_STORAGE="filesystem,file"
+		export PERSISTENCE_STORAGE
 	fi
 }
 
@@ -530,6 +530,24 @@ what_is_mounted_on ()
 	grep -m1 "^[^ ]\+ ${dir} " /proc/mounts | cut -d' ' -f1
 }
 
+chown_ref ()
+{
+	local reference="${1}"
+	shift
+	local targets=${@}
+	local owner=$(stat -c %u:%g "${reference}")
+	chown -h ${owner} ${targets}
+}
+
+chmod_ref ()
+{
+	local reference="${1}"
+	shift
+	local targets=${@}
+	local rights=$(stat -c %a "${reference}")
+	chmod ${rights} ${targets}
+}
+
 lastline ()
 {
 	while read lines
@@ -719,7 +737,7 @@ try_mount ()
 	fi
 }
 
-mount_persistent_media ()
+mount_persistence_media ()
 {
 	local device=${1}
 	local backing=""
@@ -730,7 +748,7 @@ mount_persistent_media ()
 	then
 		backing="/$(basename ${device})-backing"
 	else
-		backing="${rootmnt}/live/persistent/$(basename ${device})"
+		backing="${rootmnt}/live/persistence/$(basename ${device})"
 	fi
 
 	mkdir -p "${backing}"
@@ -739,7 +757,7 @@ mount_persistent_media ()
 	then
 		local fstype="$(get_fstype ${device})"
 		local mount_opts="rw,noatime"
-		if [ -n "${PERSISTENT_READONLY}" ]
+		if [ -n "${PERSISTENCE_READONLY}" ]
 		then
 			mount_opts="ro,noatime"
 		fi
@@ -748,7 +766,7 @@ mount_persistent_media ()
 			echo ${backing}
 			return 0
 		else
-			log_warning_msg "Failed to mount persistent media ${device}"
+			log_warning_msg "Failed to mount persistence media ${device}"
 			return 1
 		fi
 	elif [ "${backing}" != "${old_backing}" ]
@@ -758,14 +776,14 @@ mount_persistent_media ()
 			echo ${backing}
 			return 0
 		else
-			log_warning_msg "Failed to move persistent media ${device}"
+			log_warning_msg "Failed to move persistence media ${device}"
 			return 1
 		fi
 	fi
 	return 0
 }
 
-close_persistent_media () {
+close_persistence_media () {
 	local device=${1}
 	local backing="$(where_is_mounted ${device})"
 
@@ -786,7 +804,7 @@ open_luks_device ()
 	dev="${1}"
 	name="$(basename ${dev})"
 	opts="--key-file=-"
-	if [ -n "${PERSISTENT_READONLY}" ]
+	if [ -n "${PERSISTENCE_READONLY}" ]
 	then
 		opts="${opts} --readonly"
 	fi
@@ -894,7 +912,7 @@ probe_for_file_name ()
 	local dev="${3}"
 
 	local ret=""
-	local backing="$(mount_persistent_media ${dev})"
+	local backing="$(mount_persistence_media ${dev})"
 	if [ -z "${backing}" ]
 	then
 	    return
@@ -902,7 +920,7 @@ probe_for_file_name ()
 
 	for label in ${overlays}
 	do
-		path=${backing}/${PERSISTENT_PATH}${label}
+		path=${backing}/${PERSISTENCE_PATH}${label}
 		if [ -f "${path}" ]
 		then
 			local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
@@ -913,7 +931,7 @@ probe_for_file_name ()
 	do
 		for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
 		do
-			path="${PERSISTENT_PATH}${label}.${ext}"
+			path="${PERSISTENCE_PATH}${label}.${ext}"
 			if [ -f "${backing}/${path}" ]
 			then
 				ret="${ret} ${label}=${dev}:${backing}:${path}"
@@ -929,7 +947,7 @@ probe_for_file_name ()
 	fi
 }
 
-find_persistent_media ()
+find_persistence_media ()
 {
 	# Scans devices for overlays and snapshots, and returns a whitespace
 	# separated list of how to use them. Only overlays with a partition
@@ -937,7 +955,7 @@ find_persistent_media ()
 	# snapshots with labels in ${snapshots}.
 	#
 	# When scanning a LUKS device, the user will be asked to enter the
-	# passphrase; on failure to enter it, or if no persistent partitions
+	# passphrase; on failure to enter it, or if no persistence partitions
 	# or files were found, the LUKS device is closed.
 	#
 	# For a snapshot file the return value is ${label}=${snapdata}", where
@@ -966,7 +984,7 @@ find_persistent_media ()
 		# 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\>" && \
+		if echo ${PERSISTENCE_ENCRYPTION} | grep -qe "\<luks\>" && \
 		   is_luks_partition ${dev}
 		then
 			if luks_device=$(open_luks_device "${dev}")
@@ -976,14 +994,14 @@ find_persistent_media ()
 				# skip $dev since we failed/chose not to open it
 				continue
 			fi
-		elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
+		elif echo ${PERSISTENCE_ENCRYPTION} | grep -qve "\<none\>"
 		then
 			# skip $dev since we don't allow unencrypted storage
 			continue
 		fi
 
 		# Probe for matching GPT partition names or filesystem labels
-		if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
+		if echo ${PERSISTENCE_STORAGE} | grep -qe "\<filesystem\>"
 		then
 			result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${dev})
 			if [ -n "${result}" ]
@@ -1001,7 +1019,7 @@ find_persistent_media ()
 		fi
 
 		# Probe for files with matching name on mounted partition
-		if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
+		if echo ${PERSISTENCE_STORAGE} | grep -qe "\<file\>"
 		then
 			result=$(probe_for_file_name "${overlays}" "${snapshots}" ${dev})
 			if [ -n "${result}" ]
@@ -1140,8 +1158,8 @@ link_files ()
 	# live-boot normally does (into $rootmnt)).
 
 	# remove multiple /:s and ensure ending on /
-	local src_dir="$(echo "${1}"/ | sed -e 's|/\+|/|g')"
-	local dest_dir="$(echo "${2}"/ | sed -e 's|/\+|/|g')"
+	local src_dir="$(trim_path ${1})/"
+	local dest_dir="$(trim_path ${2})/"
 	local src_mask="${3}"
 
 	# This check can only trigger on the inital, non-recursive call since
@@ -1163,18 +1181,19 @@ link_files ()
 			if [ ! -d "${dest}" ]
 			then
 				mkdir -p "${dest}"
-				prev="$(dirname "${dest}")"
-				chown --reference "${prev}" "${dest}"
-				chmod --reference "${prev}" "${dest}"
+				chown_ref "${src}" "${dest}"
+				chmod_ref "${src}" "${dest}"
 			fi
 			link_files "${src}" "${dest}" "${src_mask}"
 		else
+			local final_src=${src}
 			if [ -n "${src_mask}" ]
 			then
-				src="$(echo ${src} | sed "s|^${src_mask}||")"
+				final_src="$(echo ${final_src} | sed "s|^${src_mask}||")"
 			fi
 			rm -rf "${dest}" 2> /dev/null
-			ln -s "${src}" "${dest}"
+			ln -s "${final_src}" "${dest}"
+			chown_ref "${src}" "${dest}"
 		fi
 	done
 }
@@ -1242,7 +1261,7 @@ do_union ()
 
 get_custom_mounts ()
 {
-	# Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistent
+	# Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistence
 	# Side-effect: prints info to file $custom_mounts
 
 	local custom_mounts=${1}
@@ -1261,7 +1280,7 @@ get_custom_mounts ()
 		fi
 
 		local device_name="$(basename ${device})"
-		local backing=$(mount_persistent_media ${device})
+		local backing=$(mount_persistence_media ${device})
 		if [ -z "${backing}" ]
 		then
 			continue
@@ -1275,7 +1294,7 @@ get_custom_mounts ()
 
 		if [ -n "${DEBUG}" ] && [ -e "${include_list}" ]
 		then
-			cp ${include_list} ${rootmnt}/live/persistent/${persistence_list}.${device_name}
+			cp ${include_list} ${rootmnt}/live/persistence/${persistence_list}.${device_name}
 		fi
 
 		while read dir options # < ${include_list}
@@ -1303,7 +1322,7 @@ get_custom_mounts ()
 					linkfiles)
 						opt_linkfiles="yes"
 						;;
-					union)
+					union|bind)
 						;;
 					*)
 						log_warning_msg "Skipping custom mount with unkown option: ${opt}"
@@ -1355,7 +1374,7 @@ get_custom_mounts ()
 	do
 		if echo ${source} | grep -qe "^${prev_source}\(/.*\)\?$"
 		then
-			panic "Two persistent mounts have the same or nested sources: ${source} on ${dest}, and ${prev_source} on ${prev_dest}"
+			panic "Two persistence mounts have the same or nested sources: ${source} on ${dest}, and ${prev_source} on ${prev_dest}"
 		fi
 		prev_source=${source}
 		prev_dest=${dest}
@@ -1369,25 +1388,27 @@ activate_custom_mounts ()
 
 	while read device source dest options # < ${custom_mounts}
 	do
+		local opt_bind="yes"
 		local opt_linkfiles=""
 		local opt_union=""
 		for opt in $(echo ${options} | tr ',' ' ');
 		do
 			case "${opt}" in
+				bind)
+					opt_bind="yes"
+					unset opt_linkfiles opt_union
+					;;
 				linkfiles)
 					opt_linkfiles="yes"
+					unset opt_bind opt_union
 					;;
 				union)
 					opt_union="yes"
+					unset opt_bind opt_linkfiles
 					;;
 			esac
 		done
 
-		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 ${dest}: $(what_is_mounted_on "${dest}") is already mounted there"
@@ -1419,13 +1440,13 @@ activate_custom_mounts ()
 			done
 		fi
 
-		# if ${source} doesn't exist on our persistent media
+		# if ${source} doesn't exist on our persistence media
 		# we bootstrap it with $dest from the live filesystem.
 		# this both makes sense and is critical if we're
 		# dealing with /etc or other system dir.
 		if [ ! -d "${source}" ]
 		then
-			if [ -n "${PERSISTENT_READONLY}" ]
+			if [ -n "${PERSISTENCE_READONLY}" ]
 			then
 				continue
 			elif [ -n "${opt_union}" ] || [ -n "${opt_linkfiles}" ]
@@ -1433,9 +1454,10 @@ activate_custom_mounts ()
 				# unions and don't need to be bootstrapped
 				# linkfiles dirs can't be bootstrapped in a sensible way
 				mkdir -p "${source}"
-				chown --reference "${dest}" "${source}"
-				chmod --reference "${dest}" "${source}"
-			else
+				chown_ref "${dest}" "${source}"
+				chmod_ref "${dest}" "${source}"
+			elif [ -n "${opt_bind}" ]
+			then
 				# ensure that $dest is not copied *into* $source
 				mkdir -p "$(dirname ${source})"
 				cp -a "${dest}" "${source}"
@@ -1444,49 +1466,73 @@ activate_custom_mounts ()
 
 		# 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 ${rootmnt}/live/rofs/*
-		do
-			if [ -n "${rootmnt}" ]
-			then
-				rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
-			else
-				rofs_dest_backing="${d}/${dest}"
-			fi
-			if [ -d "${rofs_dest_backing}" ]
-			then
-				break
-			else
-				rofs_dest_backing=""
-			fi
-		done
+		local rofs_dest_backing=""
+		if [ -n "${opt_linkfiles}"]
+		then
+			for d in ${rootmnt}/live/rofs/*
+			do
+				if [ -n "${rootmnt}" ]
+				then
+					rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
+				else
+					rofs_dest_backing="${d}/${dest}"
+				fi
+				if [ -d "${rofs_dest_backing}" ]
+				then
+					break
+				else
+					rofs_dest_backing=""
+				fi
+			done
+		fi
 
-		if [ -z "${PERSISTENT_READONLY}" ]
+		if [ -n "${opt_linkfiles}" ] && [ -z "${PERSISTENCE_READONLY}" ]
 		then
-			if [ -n "${opt_linkfiles}" ]
-			then
-				links_source="${source}"
-				links_dest="${dest}"
-			elif [ -n "${opt_union}" ]
+			link_files ${source} ${dest} ${rootmnt}
+		elif [ -n "${opt_linkfiles}" ] && [ -n "${PERSISTENCE_READONLY}" ]
+		then
+			mkdir -p ${rootmnt}/live/persistence
+			local links_source=$(mktemp -d ${rootmnt}/live/persistence/links-source-XXXXXX)
+			chown_ref ${source} ${links_source}
+			chmod_ref ${source} ${links_source}
+			# We put the cow dir in the below strange place to
+			# make it absolutely certain that the link source
+			# has its own directory and isn't nested with some
+			# other custom mount (if so that mount's files would
+			# be linked, causing breakage.
+			if [ -n "${rootmnt}" ]
 			then
-				do_union ${dest} ${source} ${rofs_dest_backing}
+				local cow_dir="/overlay/live/persistence/$(basename ${links_source})"
 			else
-				mount --bind "${source}" "${dest}"
-			fi
-		else
-			if [ -n "${opt_linkfiles}" ]
-			then
-				links_dest="${dest}"
-				dest="$(mktemp -d ${persistent_backing}/links_source-XXXXXX)"
-				links_source="${dest}"
+				# This is happens if persistence is activated
+				# post boot
+				local cow_dir="/live/overlay/live/persistence/$(basename ${links_source})"
 			fi
+			mkdir -p ${cow_dir}
+			chown_ref "${source}" "${cow_dir}"
+			chmod_ref "${source}" "${cow_dir}"
+			do_union ${links_source} ${cow_dir} ${source} ${rofs_dest_backing}
+			link_files ${links_source} ${dest} ${rootmnt}
+		elif [ -n "${opt_union}" ] && [ -z "${PERSISTENCE_READONLY}" ]
+		then
+			do_union ${dest} ${source} ${rofs_dest_backing}
+		elif [ -n "${opt_bind}" ] && [ -z "${PERSISTENCE_READONLY}" ]
+		then
+			mount --bind "${source}" "${dest}"
+		elif [ -n "${opt_bind}" -o -n "${opt_union}" ] && [ -n "${PERSISTENCE_READONLY}" ]
+		then
+			# bind-mount and union mount are handled the same
+			# in read-only mode, but note that rofs_dest_backing
+			# is non-empty (and necessary) only for unions
 			if [ -n "${rootmnt}" ]
 			then
-				cow_dir="$(echo ${dest} | sed -e "s|${rootmnt}|/cow/|")"
+				local cow_dir="$(echo ${dest} | sed -e "s|^${rootmnt}|/overlay/|")"
 			else
-				cow_dir="/live/cow/${dest}"
+				# This is happens if persistence is activated
+				# post boot
+				local cow_dir="/live/overlay/${dest}"
 			fi
-			if [ -e "${cow_dir}" ]
+			if [ -e "${cow_dir}" ] && [ -z "${opt_linkfiles}" ]
 			then
 				# If an earlier custom mount has files here
 				# it will "block" the current mount's files
@@ -1494,16 +1540,11 @@ activate_custom_mounts ()
 				rm -rf "${cow_dir}"
 			fi
 			mkdir -p ${cow_dir}
-			chown --reference "${source}" "${cow_dir}"
-			chmod --reference "${source}" "${cow_dir}"
+			chown_ref "${source}" "${cow_dir}"
+			chmod_ref "${source}" "${cow_dir}"
 			do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
 		fi
 
-		if [ -n "${opt_linkfiles}" ]
-		then
-			link_files "${links_source}" "${links_dest}" "${rootmnt}"
-		fi
-
 		PERSISTENCE_IS_ON="1"
 		export PERSISTENCE_IS_ON
 
@@ -1520,12 +1561,12 @@ fix_home_rw_compatibility ()
 {
 	local device=${1}
 
-	if [ -n "${PERSISTENT_READONLY}" ]
+	if [ -n "${PERSISTENCE_READONLY}" ]
 	then
 		return
 	fi
 
-	local backing="$(mount_persistent_media ${device})"
+	local backing="$(mount_persistence_media ${device})"
 	if [ -z "${backing}" ]
 	then
 		return