X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=components%2F9990-overlay.sh;fp=components%2F9990-overlay.sh;h=6b620938fe496bffd3410c8327f118e13404c20d;hb=a331218718282c5496ff062a0f6aa55908224862;hp=0000000000000000000000000000000000000000;hpb=0aa07bd386f516176364e710e8b9132036c72986;p=live-boot-grml.git

diff --git a/components/9990-overlay.sh b/components/9990-overlay.sh
new file mode 100755
index 0000000..6b62093
--- /dev/null
+++ b/components/9990-overlay.sh
@@ -0,0 +1,406 @@
+#!/bin/sh
+
+#set -e
+
+setup_unionfs ()
+{
+	image_directory="${1}"
+	rootmnt="${2}"
+	addimage_directory="${3}"
+
+	case ${UNIONTYPE} in
+		aufs|unionfs|overlayfs)
+			modprobe -q -b ${UNIONTYPE}
+
+			if ! cut -f2 /proc/filesystems | grep -q "^${UNIONTYPE}\$" && [ -x /bin/unionfs-fuse ]
+			then
+				echo "${UNIONTYPE} not available, falling back to unionfs-fuse."
+				echo "This might be really slow."
+
+				UNIONTYPE="unionfs-fuse"
+			fi
+			;;
+	esac
+
+	case "${UNIONTYPE}" in
+		unionfs-fuse)
+			modprobe fuse
+			;;
+	esac
+
+	# run-init can't deal with images in a subdir, but we're going to
+	# move all of these away before it runs anyway.  No, we're not,
+	# put them in / since move-mounting them into / breaks mono and
+	# some other apps.
+
+	croot="/"
+
+	# Let's just mount the read-only file systems first
+	rootfslist=""
+
+	if [ -z "${PLAIN_ROOT}" ]
+	then
+		# Read image names from ${MODULE}.module if it exists
+		if [ -e "${image_directory}/filesystem.${MODULE}.module" ]
+		then
+			for IMAGE in $(cat ${image_directory}/filesystem.${MODULE}.module)
+			do
+				image_string="${image_string} ${image_directory}/${IMAGE}"
+			done
+		elif [ -e "${image_directory}/${MODULE}.module" ]
+		then
+			for IMAGE in $(cat ${image_directory}/${MODULE}.module)
+			do
+				image_string="${image_string} ${image_directory}/${IMAGE}"
+			done
+		else
+			# ${MODULE}.module does not exist, create a list of images
+			for FILESYSTEM in squashfs ext2 ext3 ext4 xfs jffs2 dir
+			do
+				for IMAGE in "${image_directory}"/*."${FILESYSTEM}"
+				do
+					if [ -e "${IMAGE}" ]
+					then
+						image_string="${image_string} ${IMAGE}"
+					fi
+				done
+			done
+
+			if [ -n "${addimage_directory}" ] && [ -d "${addimage_directory}" ]
+			then
+				for FILESYSTEM in squashfs ext2 ext3 ext4 xfs jffs2 dir
+				do
+					for IMAGE in "${addimage_directory}"/*."${FILESYSTEM}"
+					do
+						if [ -e "${IMAGE}" ]
+						then
+							image_string="${image_string} ${IMAGE}"
+						fi
+					done
+				done
+			fi
+
+			# Now sort the list
+			image_string="$(echo ${image_string} | sed -e 's/ /\n/g' | sort )"
+		fi
+
+		[ -n "${MODULETORAMFILE}" ] && image_string="${image_directory}/$(basename ${MODULETORAMFILE})"
+
+		mkdir -p "${croot}"
+
+		for image in ${image_string}
+		do
+			imagename=$(basename "${image}")
+
+			export image devname
+			maybe_break live-realpremount
+			log_begin_msg "Running /scripts/live-realpremount"
+			run_scripts /scripts/live-realpremount
+			log_end_msg
+
+			if [ -d "${image}" ]
+			then
+				# it is a plain directory: do nothing
+				rootfslist="${image} ${rootfslist}"
+			elif [ -f "${image}" ]
+			then
+				if losetup --help 2>&1 | grep -q -- "-r\b"
+				then
+					backdev=$(get_backing_device "${image}" "-r")
+				else
+					backdev=$(get_backing_device "${image}")
+				fi
+				fstype=$(get_fstype "${backdev}")
+
+				case "${fstype}" in
+					unknown)
+						panic "Unknown file system type on ${backdev} (${image})"
+						;;
+
+					"")
+						fstype="${imagename##*.}"
+						log_warning_msg "Unknown file system type on ${backdev} (${image}), assuming ${fstype}."
+						;;
+				esac
+
+				case "${UNIONTYPE}" in
+					unionmount)
+						mpoint="${rootmnt}"
+						rootfslist="${rootmnt} ${rootfslist}"
+						;;
+
+					*)
+						mpoint="${croot}/${imagename}"
+						rootfslist="${mpoint} ${rootfslist}"
+						;;
+				esac
+
+				mkdir -p "${mpoint}"
+				log_begin_msg "Mounting \"${image}\" on \"${mpoint}\" via \"${backdev}\""
+				mount -t "${fstype}" -o ro,noatime "${backdev}" "${mpoint}" || panic "Can not mount ${backdev} (${image}) on ${mpoint}"
+				log_end_msg
+			fi
+		done
+	else
+		# we have a plain root system
+		mkdir -p "${croot}/filesystem"
+		log_begin_msg "Mounting \"${image_directory}\" on \"${croot}/filesystem\""
+		mount -t $(get_fstype "${image_directory}") -o ro,noatime "${image_directory}" "${croot}/filesystem" || \
+			panic "Can not mount ${image_directory} on ${croot}/filesystem" && \
+			rootfslist="${croot}/filesystem ${rootfslist}"
+		# probably broken:
+		mount -o bind ${croot}/filesystem $mountpoint
+		log_end_msg
+	fi
+
+	# tmpfs file systems
+	touch /etc/fstab
+	mkdir -p /live/overlay
+	mount -t tmpfs tmpfs /live/overlay
+
+	# Looking for persistence devices or files
+	if [ -n "${PERSISTENCE}" ] && [ -z "${NOPERSISTENCE}" ]
+	then
+
+		if [ -z "${QUICKUSBMODULES}" ]
+		then
+			# Load USB modules
+			num_block=$(ls -l /sys/block | wc -l)
+			for module in sd_mod uhci-hcd ehci-hcd ohci-hcd usb-storage
+			do
+				modprobe -q -b ${module}
+			done
+
+			udevadm trigger
+			udevadm settle
+
+			# For some reason, udevsettle does not block in this scenario,
+			# so we sleep for a little while.
+			#
+			# See https://bugs.launchpad.net/ubuntu/+source/casper/+bug/84591
+			for timeout in 5 4 3 2 1
+			do
+				sleep 1
+
+				if [ $(ls -l /sys/block | wc -l) -gt ${num_block} ]
+				then
+					break
+				fi
+			done
+		fi
+
+		local whitelistdev
+		whitelistdev=""
+		if [ -n "${PERSISTENCE_MEDIA}" ]
+		then
+			case "${PERSISTENCE_MEDIA}" in
+				removable)
+					whitelistdev="$(removable_dev)"
+					;;
+
+				removable-usb)
+					whitelistdev="$(removable_usb_dev)"
+					;;
+			esac
+			if [ -z "${whitelistdev}" ]
+			then
+				whitelistdev="ignore_all_devices"
+			fi
+		fi
+
+		if is_in_comma_sep_list overlay ${PERSISTENCE_METHOD}
+		then
+			overlays="${custom_overlay_label}"
+		fi
+
+		local overlay_devices
+		overlay_devices=""
+		if [ "${whitelistdev}" != "ignore_all_devices" ]
+		then
+			for media in $(find_persistence_media "${overlays}" "${whitelistdev}")
+			do
+				media="$(echo ${media} | tr ":" " ")"
+
+				case ${media} in
+					${custom_overlay_label}=*)
+						device="${media#*=}"
+						overlay_devices="${overlay_devices} ${device}"
+						;;
+				 esac
+			done
+		fi
+	elif [ -n "${NFS_COW}" ] && [ -z "${NOPERSISTENCE}" ]
+	then
+		# check if there are any nfs options
+		if echo ${NFS_COW} | grep -q ','
+		then
+			nfs_cow_opts="-o nolock,$(echo ${NFS_COW}|cut -d, -f2-)"
+			nfs_cow=$(echo ${NFS_COW}|cut -d, -f1)
+		else
+			nfs_cow_opts="-o nolock"
+			nfs_cow=${NFS_COW}
+		fi
+
+		if [ -n "${PERSISTENCE_READONLY}" ]
+		then
+			nfs_cow_opts="${nfs_cow_opts},nocto,ro"
+		fi
+
+		mac="$(get_mac)"
+		if [ -n "${mac}" ]
+		then
+			cowdevice=$(echo ${nfs_cow} | sed "s/client_mac_address/${mac}/")
+			cow_fstype="nfs"
+		else
+			panic "unable to determine mac address"
+		fi
+	fi
+
+	if [ -z "${cowdevice}" ]
+	then
+		cowdevice="tmpfs"
+		cow_fstype="tmpfs"
+		cow_mountopt="rw,noatime,mode=755"
+	fi
+
+	if [ "${UNIONTYPE}" != "unionmount" ]
+	then
+		if [ -n "${PERSISTENCE_READONLY}" ] && [ "${cowdevice}" != "tmpfs" ]
+		then
+			mount -t tmpfs -o rw,noatime,mode=755 tmpfs "/live/overlay"
+			root_backing="/live/persistence/$(basename ${cowdevice})-root"
+			mkdir -p ${root_backing}
+		else
+			root_backing="/live/overlay"
+		fi
+
+		if [ "${cow_fstype}" = "nfs" ]
+		then
+			log_begin_msg \
+				"Trying nfsmount ${nfs_cow_opts} ${cowdevice} ${root_backing}"
+			nfsmount ${nfs_cow_opts} ${cowdevice} ${root_backing} || \
+				panic "Can not mount ${cowdevice} (n: ${cow_fstype}) on ${root_backing}"
+		else
+			mount -t ${cow_fstype} -o ${cow_mountopt} ${cowdevice} ${root_backing} || \
+				panic "Can not mount ${cowdevice} (o: ${cow_fstype}) on ${root_backing}"
+		fi
+	fi
+
+	rootfscount=$(echo ${rootfslist} |wc -w)
+
+	rootfs=${rootfslist%% }
+
+	if [ -n "${EXPOSED_ROOT}" ]
+	then
+		if [ ${rootfscount} -ne 1 ]
+		then
+			panic "only one RO file system supported with exposedroot: ${rootfslist}"
+		fi
+
+		mount --bind ${rootfs} ${rootmnt} || \
+			panic "bind mount of ${rootfs} failed"
+
+		if [ -z "${SKIP_UNION_MOUNTS}" ]
+		then
+			cow_dirs='/var/tmp /var/lock /var/run /var/log /var/spool /home /var/lib/live'
+		else
+			cow_dirs=''
+		fi
+	else
+		cow_dirs="/"
+	fi
+
+	if [ "${cow_fstype}" != "tmpfs" ] && [ "${cow_dirs}" != "/" ] && [ "${UNIONTYPE}" = "unionmount" ]
+	then
+		true # FIXME: Maybe it does, I don't really know.
+		#panic "unionmount does not support subunions (${cow_dirs})."
+	fi
+
+	for dir in ${cow_dirs}; do
+		unionmountpoint="${rootmnt}${dir}"
+		mkdir -p ${unionmountpoint}
+		if [ "${UNIONTYPE}" = "unionmount" ]
+		then
+			# FIXME: handle PERSISTENCE_READONLY
+			unionmountopts="-t ${cow_fstype} -o noatime,union,${cow_mountopt} ${cowdevice}"
+			# unionmount only works with util-linux mount
+			mount.util-linux $unionmountopts "${unionmountpoint}"
+		else
+			cow_dir="/live/overlay${dir}"
+			rootfs_dir="${rootfs}${dir}"
+			mkdir -p ${cow_dir}
+			if [ -n "${PERSISTENCE_READONLY}" ] && [ "${cowdevice}" != "tmpfs" ]
+			then
+				do_union ${unionmountpoint} ${cow_dir} ${root_backing} ${rootfs_dir}
+			else
+				do_union ${unionmountpoint} ${cow_dir} ${rootfs_dir}
+			fi
+		fi || panic "mount ${UNIONTYPE} on ${unionmountpoint} failed with option ${unionmountopts}"
+	done
+
+	# Correct the permissions of /:
+	chmod 0755 "${rootmnt}"
+
+	# Correct the permission of /tmp:
+	if [ -d "${rootmnt}/tmp" ]
+	then
+		chmod 1777 "${rootmnt}"/tmp
+	fi
+
+	live_rootfs_list=""
+	for d in ${rootfslist}
+	do
+		live_rootfs="/live/rootfs/${d##*/}"
+		live_rootfs_list="${live_rootfs_list} ${live_rootfs}"
+		mkdir -p "${live_rootfs}"
+		case d in
+			*.dir)
+				# do nothing # mount -o bind "${d}" "${live_rootfs}"
+				;;
+			*)
+				case "${UNIONTYPE}" in
+					unionfs-fuse)
+						mount -o bind "${d}" "${live_rootfs}"
+						;;
+
+					*)
+						mount -o move "${d}" "${live_rootfs}"
+						;;
+				esac
+				;;
+		esac
+	done
+
+	# Adding custom persistence
+	if [ -n "${PERSISTENCE}" ] && [ -z "${NOPERSISTENCE}" ]
+	then
+		local custom_mounts
+		custom_mounts="/tmp/custom_mounts.list"
+		rm -rf ${custom_mounts} 2> /dev/null
+
+		# Gather information about custom mounts from devies detected as overlays
+		get_custom_mounts ${custom_mounts} ${overlay_devices}
+
+		[ -n "${LIVE_BOOT_DEBUG}" ] && cp ${custom_mounts} "/lib/live/mount/persistence"
+
+		# Now we do the actual mounting (and symlinking)
+		local used_overlays
+		used_overlays=""
+		used_overlays=$(activate_custom_mounts ${custom_mounts})
+		rm ${custom_mounts}
+
+		# Close unused overlays (e.g. due to missing $persistence_list)
+		for overlay in ${overlay_devices}
+		do
+			if echo ${used_overlays} | grep -qve "^\(.* \)\?${overlay}\( .*\)\?$"
+			then
+				close_persistence_media ${overlay}
+			fi
+		done
+	fi
+
+        # ensure that a potentially stray tmpfs gets removed
+        # otherways, initramfs-tools is unable to remove /live
+        # and fails to boot
+        umount /live/overlay > /dev/null 2>&1 || true
+}