X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=scripts%2Flive-helpers;h=c1efeec149082728ae18a956fb5b6f77f017c464;hb=931f580302ca3a121d3be602a49e732d5189b667;hp=31093563f1404c83b7b397ef1aa2292d1aba8054;hpb=f88546749c32ecf41bf31871507aa012af4e807b;p=live-boot-grml.git

diff --git a/scripts/live-helpers b/scripts/live-helpers
index 3109356..c1efeec 100644
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -556,3 +556,365 @@ non_removable_dev ()
 
 	echo "${ret}"
 }
+
+link_files ()
+{
+	# create source's directory structure in dest, and recursively
+	# create symlinks in dest to to all files in source. if mask
+	# is non-empty, remove mask from all source paths when
+	# creating links (will be necessary if we change root, which
+	# 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 "${2}"/ | sed -e 's|/\+|/|g')"
+	local src_mask="${3}"
+
+	# This check can only trigger on the inital, non-recursive call since
+	# we create the destination before recursive calls
+	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 "${src}" ];
+		then
+			if [ -z "$(ls -A "${src}")" ];
+			then
+				continue
+			fi
+			if [ ! -d "${dest}" ];
+			then
+				mkdir -p "${dest}"
+				prev="$(dirname "${dest}")"
+				chown $(stat -c %u:%g "${prev}") "${dest}"
+				chmod $(stat -c %a "${prev}") "${dest}"
+			fi
+			link_files "${src}" "${dest}" "${src_mask}"
+		else
+			if [ -n "${src_mask}" ]
+			then
+				src="$(echo ${src} | sed "s|^${src_mask}||")"
+			fi
+			rm -rf "${dest}" 2> /dev/null
+			ln -s "${src}" "${dest}"
+		fi
+	done
+}
+
+do_union () {
+	local unionmountpoint="${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)
+	local unionro2="${4}"		# second underlying read-only branch (optional)
+
+	if [ "${UNIONTYPE}" = "aufs" ]
+	then
+		rw_opt="rw"
+		ro_opt="rr+wh"
+		noxino_opt="noxino"
+	elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
+	then
+		rw_opt="RW"
+		ro_opt="RO"
+	else
+		rw_opt="rw"
+		ro_opt="ro"
+	fi
+
+	case "${UNIONTYPE}" in
+		unionfs-fuse)
+			unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
+			unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
+			if [ -n "${unionro1}" ]
+			then
+				unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
+			fi
+			if [ -n "${unionro2}" ]
+			then
+				unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
+			fi
+			( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
+			unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
+			( mkdir -p /run/sendsigs.omit.d
+			pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
+			;;
+
+		overlayfs)
+			# XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
+			# XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
+			unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
+			mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
+			;;
+
+		*)
+			unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
+			if [ -n "${unionro1}" ]
+			then
+				unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
+			fi
+			if [ -n "${unionro2}" ]
+			then
+				unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
+			fi
+			mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
+			;;
+	esac
+}
+
+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 bindings="/bindings.list"
+	local links="/links.list"
+	rm -rf ${bindings} ${links} 2> /dev/null
+	local persistent_backing="${rootmnt}/live/persistent"
+
+	for device in ${devices}
+	do
+		if [ ! -b "${device}" ]
+		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}" ]
+		then
+			device_mount_opts="rw,noatime"
+		else
+			device_mount_opts="ro,noatime"
+		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}
+		do
+			if echo ${source} | grep -qe "^[[:space:]]*\(#.*\)\?$"
+			then
+				# skipping empty or commented lines
+				continue
+			fi
+
+			if echo ${dest} | grep -qe "^[^/]"
+			then
+				options="${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}"
+				continue
+			fi
+
+			for opt in $(echo ${options} | tr ',' ' ');
+			do
+				case "${opt}" in
+					linkfiles|union)
+						;;
+					*)
+						log_warning_msg "Skipping custom mount with unkown option: ${opt}"
+						continue 2
+						;;
+				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 $device, now we find /a/b, so
+			# we skip /a/b
+
+			# ensure that no multiple-/ occur in paths
+			local full_source="$(echo ${backing}/${source}/ | sed -e 's|/\+|/|g')"
+			local full_dest="$(echo ${rootmnt}/${dest}/ | sed -e 's|/\+|/|g')"
+			device_used="yes"
+			if echo ${options} | grep -qe "\<linkfiles\>";
+			then
+				echo "${full_source} ${full_dest} ${options}" >> ${links}
+			else
+				echo "${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 ${bindings}
+
+	# After all mounts are considered we add symlinks so they
+	# won't be hidden by some mount.
+	[ -e "${links}" ] && sort -k2 -sbu ${links} >> ${custom_mounts}
+	rm ${links}
+
+	rm -f ${bindings} ${links} 2> /dev/null
+	echo ${custom_mounts}
+}
+
+do_custom_mounts () {
+	local custom_mounts="${1}" # the ouput from get_custom_mounts()
+	local rootmnt="${2}"       # should be set empty post-live-boot
+
+	while read source dest options # < ${custom_mounts}
+	do
+		local opt_linkfiles=""
+		local opt_union=""
+		for opt in $(echo ${options} | tr ',' ' ');
+		do
+			 case "${opt}" in
+				linkfiles)
+					opt_linkfiles="yes"
+					;;
+				union)
+					opt_union="yes"
+					;;
+			esac
+		done
+
+		if mountpoint -q "${dest}";
+		then
+			log_warning_msg "Skipping custom mount ${source} on ${dest}: destination is already a mount point"
+			continue
+		fi
+
+		# FIXME: we don't handle already existing
+		# non-directory files in the paths of both $source and
+		# $dest.
+
+		if [ ! -d "${dest}" ]
+		then
+			# if ${dest} is in /home/$user, try fixing
+			# proper ownership
+			# 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/\+[^/]\+"
+			then
+				path="/"
+				for dir in $(echo ${dest} | sed -e 's|/\+| |g')
+				do
+					path=${path}/${dir}
+					if [ ! -e ${path} ]
+					then
+						mkdir -p ${path}
+						# assume that the intended user is the first, which is usually the case
+						chown 1000:1000 ${path}
+					fi
+				done
+			else
+				mkdir -p ${dest}
+			fi
+		fi
+
+		# if ${source} doesn't exist on our persistent 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 "${PERSISTENT_READONLY}" ] || [ -n "${opt_linkfiles}" ]
+			then
+				continue
+			elif [ -n "${opt_union}" ]
+			then
+				# union's don't need to be bootstrapped
+				mkdir "${source}"
+			else
+				# ensure that $dest is not copied *into* $source
+				mkdir -p "$(dirname ${source})"
+				cp -a "${dest}" "${source}"
+			fi
+		fi
+
+		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 "${rofs_dest_backing}" ]
+			then
+				break
+			else
+				rofs_dest_backing=""
+			fi
+		done
+
+		if [ -z "${PERSISTENT_READONLY}" ]
+		then
+			if [ -n "${opt_linkfiles}" ]
+			then
+				links_source="${source}"
+				links_dest="${dest}"
+			elif [ -n "${opt_union}" ]
+			then
+				do_union ${dest} ${source} ${rofs_dest_backing}
+			else
+				mount --bind "${source}" "${dest}"
+			fi
+		else
+			if [ -n "${opt_linkfiles}" ]
+			then
+				links_dest="${dest}"
+				dest="$(mktemp -d ${persistent_backing}/links_source-XXXXXX)"
+				links_source="${dest}"
+			fi
+			if [ -n "${rootmnt}" ]
+			then
+				cow_dir="$(echo ${dest} | sed -e "s|${rootmnt}|/cow/|")"
+			else
+				cow_dir="/live/cow/${dest}"
+			fi
+			mkdir -p ${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
+	done < ${custom_mounts}
+}