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-rwxr-xr-xsystem-boot/components/9990-overlay.sh337
1 files changed, 337 insertions, 0 deletions
diff --git a/system-boot/components/9990-overlay.sh b/system-boot/components/9990-overlay.sh
new file mode 100755
index 0000000..61b1f26
--- /dev/null
+++ b/system-boot/components/9990-overlay.sh
@@ -0,0 +1,337 @@
+#!/bin/sh
+
+#set -e
+
+setup_unionfs ()
+{
+ image_directory="${1}"
+ rootmnt="${2}"
+ addimage_directory="${3}"
+
+ modprobe -q -b ${UNIONTYPE}
+
+ if ! cut -f2 /proc/filesystems | grep -q "^${UNIONTYPE}\$"
+ then
+ panic "${UNIONTYPE} not available."
+ fi
+
+ croot="/run/live/rootfs"
+
+ # Let's just mount the read-only file systems first
+ rootfslist=""
+
+ if [ -z "${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 ${fstype}."
+ ;;
+ esac
+
+ mpoint=$(trim_path "${croot}/${imagename}")
+ rootfslist="${mpoint} ${rootfslist}"
+
+ mkdir -p "${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 ${mpoint}"
+ log_end_msg
+ else
+ log_warning_msg "Could not find image '${image}'. Most likely it is listed in a .module file, perhaps by mistake."
+ 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 $mountpoint
+ log_end_msg
+ fi
+
+ # tmpfs file systems
+ touch /etc/fstab
+ mkdir -p /run/live/overlay
+
+ # Looking for persistence devices or files
+ if [ -n "${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 "${cowdevice}" ]
+ then
+ cowdevice="tmpfs"
+ cow_fstype="tmpfs"
+ cow_mountopt="rw,noatime,mode=755,size=${OVERLAY_SIZE:-50%}"
+ fi
+
+ if [ -n "${PERSISTENCE_READONLY}" ] && [ "${cowdevice}" != "tmpfs" ]
+ then
+ mount -t tmpfs -o rw,noatime,mode=755,size=${OVERLAY_SIZE:-50%} tmpfs "/run/live/overlay"
+ root_backing="/run/live/persistence/$(basename ${cowdevice})-root"
+ mkdir -p ${root_backing}
+ else
+ root_backing="/run/live/overlay"
+ fi
+
+ if [ "${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 ${root_backing}"
+ fi
+
+ rootfscount=$(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 -o 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
+
+ for dir in ${cow_dirs}; do
+ unionmountpoint=$(trim_path "${rootmnt}${dir}")
+ mkdir -p ${unionmountpoint}
+ cow_dir=$(trim_path "/run/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 || panic "mount ${UNIONTYPE} on ${unionmountpoint} failed with option ${unionmountopts}"
+ done
+
+ # Remove persistence depending on boot parameter
+ Remove_persistence
+
+ # Correct the permissions of /:
+ chmod 0755 "${rootmnt}"
+
+ # Correct the permission of /tmp:
+ if [ -d "${rootmnt}/tmp" ]
+ then
+ chmod 1777 "${rootmnt}"/tmp
+ fi
+
+ # Adding custom persistence
+ if [ -n "${PERSISTENCE}" ] && [ -z "${NOPERSISTENCE}" ]
+ then
+ local custom_mounts
+ custom_mounts="/tmp/custom_mounts.list"
+ rm -f ${custom_mounts}
+
+ # Gather information about custom mounts from devies detected as overlays
+ get_custom_mounts ${custom_mounts} ${overlay_devices}
+
+ [ -n "${LIVE_BOOT_DEBUG}" ] && cp ${custom_mounts} "/run/live/persistence"
+
+ # Now we do the actual mounting (and symlinking)
+ local used_overlays
+ used_overlays=""
+ used_overlays=$(activate_custom_mounts ${custom_mounts})
+ rm -f ${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
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-20 12:45:56 +0000