1 # live-boot helper functions, used by live-boot on boot and by live-snapshot
3 if [ ! -x "/bin/fstype" ]
5 # klibc not in path -> not in initramfs
6 export PATH="${PATH}:/usr/lib/klibc/bin"
9 # handle upgrade path from old udev (using udevinfo) to
10 # recent versions of udev (using udevadm info)
11 if [ -x /sbin/udevadm ]
13 udevinfo='/sbin/udevadm info'
18 old_root_overlay_label="live-rw"
19 old_home_overlay_label="home-rw"
20 custom_overlay_label="custom-ov"
21 root_snapshot_label="live-sn"
22 old_root_snapshot_label="live-sn"
23 home_snapshot_label="home-sn"
24 persistence_list="live-persistence.conf"
31 for ARGUMENT in $(cat /proc/cmdline)
40 export NOACCESSIBILITY NOFASTBOOT NOFSTAB NONETWORKING
44 ACCESS="${ARGUMENT#access=}"
49 DEFCONSOLE="${ARGUMENT#*=}"
65 # Force dhcp even while netbooting
66 # Use for debugging in case somebody works on fixing dhclient
76 DEVICE="${ARGUMENT#ethdevice=}"
78 export DEVICE ETHDEVICE
82 ETHDEV_TIMEOUT="${ARGUMENT#ethdevice-timeout=}"
87 FETCH="${ARGUMENT#fetch=}"
92 FINDISO="${ARGUMENT#findiso=}"
97 FORCEPERSISTENCEFSCK="Yes"
98 export FORCEPERSISTENCEFSCK
102 FTPFS="${ARGUMENT#ftpfs=}"
107 HTTPFS="${ARGUMENT#httpfs=}"
112 ISCSI="${ARGUMENT#iscsi=}"
113 #ip:port - separated by ;
114 ISCSI_PORTAL="${ISCSI%;*}"
115 if echo "${ISCSI_PORTAL}" | grep -q , ; then
116 ISCSI_SERVER="${ISCSI_PORTAL%,*}"
117 ISCSI_PORT="${ISCSI_PORTAL#*,}"
120 ISCSI_TARGET="${ISCSI#*;}"
121 export ISCSI ISCSI_PORTAL ISCSI_TARGET ISCSI_SERVER ISCSI_PORT
125 FROMISO="${ARGUMENT#*=}"
135 INTEGRITY_CHECK="Yes"
136 export INTEGRITY_CHECK
140 STATICIP="${ARGUMENT#ip=}"
142 if [ -z "${STATICIP}" ]
155 live-media=*|bootfrom=*)
156 LIVE_MEDIA="${ARGUMENT#*=}"
160 live-media-encryption=*|encryption=*)
161 LIVE_MEDIA_ENCRYPTION="${ARGUMENT#*=}"
162 export LIVE_MEDIA_ENCRYPTION
166 LIVE_MEDIA_OFFSET="${ARGUMENT#live-media-offset=}"
167 export LIVE_MEDIA_OFFSET
171 LIVE_MEDIA_PATH="${ARGUMENT#live-media-path=}"
172 export LIVE_MEDIA_PATH
175 live-media-timeout=*)
176 LIVE_MEDIA_TIMEOUT="${ARGUMENT#live-media-timeout=}"
177 export LIVE_MEDIA_TIMEOUT
181 MODULE="${ARGUMENT#module=}"
186 NETBOOT="${ARGUMENT#netboot=}"
191 NFSOPTS="${ARGUMENT#nfsopts=}"
196 NFS_COW="${ARGUMENT#nfsoverlay=}"
201 NOACCESSIBILITY="Yes"
202 export NOACCESSIBILITY
221 ramdisk_size="${ARGUMENT#ramdisk-size=}"
234 persistence-encryption=*)
235 PERSISTENCE_ENCRYPTION="${ARGUMENT#*=}"
236 export PERSISTENCE_ENCRYPTION
240 PERSISTENCE_MEDIA="${ARGUMENT#*=}"
241 export PERSISTENCE_MEDIA
243 persistence-method=*)
244 PERSISTENCE_METHOD="${ARGUMENT#*=}"
245 export PERSISTENCE_METHOD
249 PERSISTENCE_PATH="${ARGUMENT#persistence-path=}"
250 export PERSISTENCE_PATH
252 persistence-read-only)
253 PERSISTENCE_READONLY="Yes"
254 export PERSISTENCE_READONLY
257 persistence-storage=*)
258 PERSISTENCE_STORAGE="${ARGUMENT#persistence-storage=}"
259 export PERSISTENCE_STORAGE
262 persistence-subtext=*)
263 old_root_overlay_label="${old_root_overlay_label}-${ARGUMENT#persistence-subtext=}"
264 old_home_overlay_label="${old_home_overlay_label}-${ARGUMENT#persistence-subtext=}"
265 custom_overlay_label="${custom_overlay_label}-${ARGUMENT#persistence-subtext=}"
266 root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistence-subtext=}"
267 old_root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistence-subtext=}"
268 home_snapshot_label="${home_snapshot_label}-${ARGUMENT#persistence-subtext=}"
282 NOPROMPT="${ARGUMENT#noprompt=}"
287 QUICKUSBMODULES="Yes"
288 export QUICKUSBMODULES
291 preseed/file=*|file=*)
292 LOCATIONS="${ARGUMENT#*=} ${LOCATIONS}"
302 question="${ARGUMENT%%=*}"
303 value="${ARGUMENT#*=}"
304 PRESEEDS="${PRESEEDS}\"${question}=${value}\" "
319 TODISK="${ARGUMENT#todisk=}"
330 MODULETORAM="${ARGUMENT#toram=}"
331 export TORAM MODULETORAM
345 SKIP_UNION_MOUNTS="Yes"
346 export SKIP_UNION_MOUNTS
350 ROOT="${ARGUMENT#root=}"
355 UNIONTYPE="${ARGUMENT#union=}"
361 # sort of compatibility with netboot.h from linux docs
362 if [ -z "${NETBOOT}" ]
364 if [ "${ROOT}" = "/dev/nfs" ]
368 elif [ "${ROOT}" = "/dev/cifs" ]
375 if [ -z "${MODULE}" ]
381 if [ -z "${UNIONTYPE}" ]
387 if [ -z "${PERSISTENCE_ENCRYPTION}" ]
389 PERSISTENCE_ENCRYPTION="none"
390 export PERSISTENCE_ENCRYPTION
391 elif echo ${PERSISTENCE_ENCRYPTION} | grep -qe "\<luks\>"
393 if ! modprobe dm-crypt
395 log_warning_msg "Unable to load module dm-crypt"
396 PERSISTENCE_ENCRYPTION=$(echo ${PERSISTENCE_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
397 export PERSISTENCE_ENCRYPTION
400 if [ ! -x /lib/cryptsetup/askpass ] || [ ! -x /sbin/cryptsetup ]
402 log_warning_msg "cryptsetup in unavailable"
403 PERSISTENCE_ENCRYPTION=$(echo ${PERSISTENCE_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
404 export PERSISTENCE_ENCRYPTION
408 if [ -z "${PERSISTENCE_METHOD}" ]
410 PERSISTENCE_METHOD="snapshot,overlay"
411 export PERSISTENCE_METHOD
414 if [ -z "${PERSISTENCE_STORAGE}" ]
416 PERSISTENCE_STORAGE="filesystem,file"
417 export PERSISTENCE_STORAGE
424 echo "/dev/$($udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
432 for dev in "${sysblock}"/* "${sysblock}"
434 if [ -e "${dev}/dev" ]
445 black_listed_devices="${1}"
446 white_listed_devices="${2}"
448 for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "loop|ram|fd")
450 fulldevname=$(sys2dev "${sysblock}")
452 if echo "${black_listed_devices}" | grep -qe "\<${fulldevname}\>" || \
453 [ -n "${white_listed_devices}" ] && \
454 echo "${white_listed_devices}" | grep -qve "\<${fulldevname}\>"
456 # skip this device entirely
460 for dev in $(subdevices "${sysblock}")
462 devname=$(sys2dev "${dev}")
464 if echo "${black_listed_devices}" | grep -qe "\<${devname}\>"
466 # skip this subdevice
479 # Validate input first
480 if [ -z "${fstype}" ]
485 # Try to look if it is already supported by the kernel
486 if grep -q ${fstype} /proc/filesystems
490 # Then try to add support for it the gentle way using the initramfs capabilities
492 if grep -q ${fstype} /proc/filesystems
495 # Then try the hard way if /root is already reachable
497 kmodule="/root/lib/modules/`uname -r`/${fstype}/${fstype}.ko"
498 if [ -e "${kmodule}" ]
501 if grep -q ${fstype} /proc/filesystems
514 /sbin/blkid -s TYPE -o value $1 2>/dev/null
521 grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
525 # remove all unnecessary /:s in the path, including last one (except
526 # if path is just "/")
527 echo ${1} | sed 's|//\+|/|g' | sed 's|^\(.*[^/]\)/$|\1|'
530 what_is_mounted_on ()
532 local dir="$(trim_path ${1})"
533 grep -m1 "^[^ ]\+ ${dir} " /proc/mounts | cut -d' ' -f1
538 local reference="${1}"
541 local owner=$(stat -c %u:%g "${reference}")
542 chown -h ${owner} ${targets}
547 local reference="${1}"
550 local rights=$(stat -c %a "${reference}")
551 chmod ${rights} ${targets}
567 mounts="$(awk '{print $2}' /proc/mounts)"
568 testpath="$(busybox realpath ${testpath})"
572 if echo "${mounts}" | grep -qs "^${testpath}"
574 set -- $(echo "${mounts}" | grep "^${testpath}" | lastline)
578 testpath=$(dirname $testpath)
585 # Returns used/free fs kbytes + 5% more
586 # You could pass a block device as ${1} or the mount point as ${2}
592 if [ -z "${mountp}" ]
594 mountp="$(where_is_mounted ${dev})"
596 if [ -z "${mountp}" ]
598 mountp="/mnt/tmp_fs_size"
601 mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
607 if [ "${used}" = "used" ]
609 size=$(du -ks ${mountp} | cut -f1)
610 size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
613 size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
616 if [ -n "${doumount}" ]
618 umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
628 if [ -x /bin/loadkeys -a -r /etc/boottime.kmap.gz ]
630 loadkeys /etc/boottime.kmap.gz
640 local encryption=${5}
643 # the output of setup_loop is evaluated in other functions,
644 # modprobe leaks kernel options like "libata.dma=0"
645 # as "options libata dma=0" on stdout, causing serious
646 # problems therefor, so instead always avoid output to stdout
647 modprobe -q -b "${module}" 1>/dev/null
651 for loopdev in ${pattern}
653 if [ "$(cat ${loopdev}/size)" -eq 0 ]
655 dev=$(sys2dev "${loopdev}")
658 if [ -n "${readonly}" ]
660 if losetup --help 2>&1 | grep -q -- "-r\b"
662 options="${options} -r"
666 if [ -n "${offset}" ] && [ 0 -lt "${offset}" ]
668 options="${options} -o ${offset}"
671 if [ -z "${encryption}" ]
673 losetup ${options} "${dev}" "${fspath}"
675 # Loop AES encryption
680 echo -n "Enter passphrase for root filesystem: " >&6
682 echo "${passphrase}" > /tmp/passphrase
684 exec 9</tmp/passphrase
685 /sbin/losetup ${options} -e "${encryption}" -p 9 "${dev}" "${fspath}"
688 rm -f /tmp/passphrase
690 if [ 0 -eq ${error} ]
697 echo -n "There was an error decrypting the root filesystem ... Retry? [Y/n] " >&6
700 if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
713 panic "No loop devices available"
723 old_mountp="$(where_is_mounted ${dev})"
725 if [ -n "${old_mountp}" ]
727 if [ "${opts}" != "ro" ]
729 mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
732 mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
734 if [ -z "${fstype}" ]
736 fstype=$(get_fstype "${dev}")
738 mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || \
739 ( echo "SKIPPING: Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}" > live-boot.log && return 0 )
743 mount_persistence_media ()
748 local backing="/live/persistence/$(basename ${device})"
750 mkdir -p "${backing}"
751 local old_backing="$(where_is_mounted ${device})"
752 if [ -z "${old_backing}" ]
754 local fstype="$(get_fstype ${device})"
755 local mount_opts="rw,noatime"
756 if [ -n "${PERSISTENCE_READONLY}" ]
758 mount_opts="ro,noatime"
760 if mount -t "${fstype}" -o "${mount_opts}" "${device}" "${backing}" >/dev/null
765 [ -z "${probe}" ] && log_warning_msg "Failed to mount persistence media ${device}"
769 elif [ "${backing}" != "${old_backing}" ]
771 if mount --move ${old_backing} ${backing} >/dev/null
776 [ -z "${probe}" ] && log_warning_msg "Failed to move persistence media ${device}"
784 close_persistence_media () {
786 local backing="$(where_is_mounted ${device})"
788 if [ -d "${backing}" ]
790 umount "${backing}" >/dev/null 2>&1
791 rmdir "${backing}" >/dev/null 2>&1
794 if is_active_luks_mapping ${device}
796 /sbin/cryptsetup luksClose ${device}
803 name="$(basename ${dev})"
805 if [ -n "${PERSISTENCE_READONLY}" ]
807 opts="${opts} --readonly"
810 if /sbin/cryptsetup status "${name}" >/dev/null 2>&1
812 re="^[[:space:]]*device:[[:space:]]*\([^[:space:]]*\)$"
813 opened_dev=$(cryptsetup status ${name} 2>/dev/null | grep "${re}" | sed "s|${re}|\1|")
814 if [ "${opened_dev}" = "${dev}" ]
816 luks_device="/dev/mapper/${name}"
820 log_warning_msg "Cannot open luks device ${dev} since ${opened_dev} already is opened with its name"
829 /lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | \
830 /sbin/cryptsetup -T 1 luksOpen ${dev} ${name} ${opts}
834 luks_device="/dev/mapper/${name}"
840 echo -n "There was an error decrypting ${dev} ... Retry? [Y/n] " >&6
843 if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
853 /sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
859 [ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
862 probe_for_gpt_name ()
864 local overlays="${1}"
865 local snapshots="${2}"
868 local gpt_dev="${dev}"
869 if is_active_luks_mapping ${dev}
871 # if $dev is an opened luks device, we need to check
872 # GPT stuff on the backing device
873 gpt_dev=$(get_luks_backing_device "${dev}")
876 if ! is_gpt_device ${gpt_dev}
881 local gpt_name=$(get_gpt_name ${gpt_dev})
882 for label in ${overlays} ${snapshots}
884 if [ "${gpt_name}" = "${label}" ]
886 echo "${label}=${dev}"
891 probe_for_fs_label ()
893 local overlays="${1}"
894 local snapshots="${2}"
897 for label in ${overlays} ${snapshots}
899 if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
901 echo "${label}=${dev}"
906 probe_for_file_name ()
908 local overlays="${1}"
909 local snapshots="${2}"
913 local backing="$(mount_persistence_media ${dev} probe)"
914 if [ -z "${backing}" ]
919 for label in ${overlays}
921 path=${backing}/${PERSISTENCE_PATH}${label}
924 local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
925 ret="${ret} ${label}=${loopdev}"
928 for label in ${snapshots}
930 for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
932 path="${PERSISTENCE_PATH}${label}.${ext}"
933 if [ -f "${backing}/${path}" ]
935 ret="${ret} ${label}=${dev}:${backing}:${path}"
944 umount ${backing} > /dev/null 2>&1 || true
948 find_persistence_media ()
950 # Scans devices for overlays and snapshots, and returns a whitespace
951 # separated list of how to use them. Only overlays with a partition
952 # label or file name in ${overlays} are returned, and ditto for
953 # snapshots with labels in ${snapshots}.
955 # When scanning a LUKS device, the user will be asked to enter the
956 # passphrase; on failure to enter it, or if no persistence partitions
957 # or files were found, the LUKS device is closed.
959 # For a snapshot file the return value is ${label}=${snapdata}", where
960 # ${snapdata} is the parameter used for try_snap().
962 # For all other cases (overlay/snapshot partition and overlay file) the
963 # return value is "${label}=${device}", where ${device} a device that
964 # can mount the content. In the case of an overlay file, the device
965 # containing the file will remain mounted as a side-effect.
967 # No devices in ${black_listed_devices} will be scanned, and if
968 # ${white_list_devices} is non-empty, only devices in it will be
971 local overlays="${1}"
972 local snapshots="${2}"
973 local white_listed_devices="${3}"
976 local black_listed_devices="$(what_is_mounted_on /live/image)"
978 for dev in $(storage_devices "${black_listed_devices}" "${white_listed_devices}")
983 # Check if it's a luks device; we'll have to open the device
984 # in order to probe any filesystem it contains, like we do
985 # below. activate_custom_mounts() also depends on that any luks
986 # device already has been opened.
987 if echo ${PERSISTENCE_ENCRYPTION} | grep -qe "\<luks\>" && \
988 is_luks_partition ${dev}
990 if luks_device=$(open_luks_device "${dev}")
994 # skip $dev since we failed/chose not to open it
997 elif echo ${PERSISTENCE_ENCRYPTION} | grep -qve "\<none\>"
999 # skip $dev since we don't allow unencrypted storage
1003 # Probe for matching GPT partition names or filesystem labels
1004 if echo ${PERSISTENCE_STORAGE} | grep -qe "\<filesystem\>"
1006 result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${dev})
1007 if [ -n "${result}" ]
1009 ret="${ret} ${result}"
1013 result=$(probe_for_fs_label "${overlays}" "${snapshots}" ${dev})
1014 if [ -n "${result}" ]
1016 ret="${ret} ${result}"
1021 # Probe for files with matching name on mounted partition
1022 if echo ${PERSISTENCE_STORAGE} | grep -qe "\<file\>"
1024 result=$(probe_for_file_name "${overlays}" "${snapshots}" ${dev})
1025 if [ -n "${result}" ]
1027 ret="${ret} ${result}"
1032 # Close luks device if it isn't used
1033 if [ -z "${result}" ] && [ -n "${luks_device}" ] && \
1034 is_active_luks_mapping "${luks_device}"
1036 /sbin/cryptsetup luksClose "${luks_device}"
1050 for adaptor in /sys/class/net/*
1052 status="$(cat ${adaptor}/iflink)"
1054 if [ "${status}" -eq 2 ]
1056 mac="$(cat ${adaptor}/address)"
1057 mac="$(echo ${mac} | sed 's/:/-/g' | tr '[a-z]' '[A-Z]')"
1064 is_luks_partition ()
1067 /sbin/cryptsetup isLuks "${device}" 1>/dev/null 2>&1
1070 is_active_luks_mapping ()
1073 /sbin/cryptsetup status "${device}" 1>/dev/null 2>&1
1076 get_luks_backing_device () {
1078 cryptsetup status ${device} 2> /dev/null | \
1079 awk '{if ($1 == "device:") print $2}'
1084 output_format="${1}"
1088 for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
1091 if [ "$(cat ${sysblock}/removable)" = "1" ]
1093 if [ -z "${want_usb}" ]
1097 if readlink ${sysblock} | grep -q usb
1104 if [ "${dev_ok}" = "yes" ]
1106 case "${output_format}" in
1108 ret="${ret} ${sysblock}"
1111 devname=$(sys2dev "${sysblock}")
1112 ret="${ret} ${devname}"
1121 removable_usb_dev ()
1123 output_format="${1}"
1125 removable_dev "${output_format}" "want_usb"
1128 non_removable_dev ()
1130 output_format="${1}"
1133 for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
1135 if [ "$(cat ${sysblock}/removable)" = "0" ]
1137 case "${output_format}" in
1139 ret="${ret} ${sysblock}"
1142 devname=$(sys2dev "${sysblock}")
1143 ret="${ret} ${devname}"
1154 # create source's directory structure in dest, and recursively
1155 # create symlinks in dest to to all files in source. if mask
1156 # is non-empty, remove mask from all source paths when
1157 # creating links (will be necessary if we change root, which
1158 # live-boot normally does (into $rootmnt)).
1160 # remove multiple /:s and ensure ending on /
1161 local src_dir="$(trim_path ${1})/"
1162 local dest_dir="$(trim_path ${2})/"
1163 local src_mask="${3}"
1165 # This check can only trigger on the inital, non-recursive call since
1166 # we create the destination before recursive calls
1167 if [ ! -d "${dest_dir}" ]
1169 log_warning_msg "Must link_files into a directory"
1173 find "${src_dir}" -mindepth 1 -maxdepth 1 | while read src; do
1174 local dest="${dest_dir}$(basename "${src}")"
1177 if [ -z "$(ls -A "${src}")" ]
1181 if [ ! -d "${dest}" ]
1184 chown_ref "${src}" "${dest}"
1185 chmod_ref "${src}" "${dest}"
1187 link_files "${src}" "${dest}" "${src_mask}"
1189 local final_src=${src}
1190 if [ -n "${src_mask}" ]
1192 final_src="$(echo ${final_src} | sed "s|^${src_mask}||")"
1194 rm -rf "${dest}" 2> /dev/null
1195 ln -s "${final_src}" "${dest}"
1196 chown_ref "${src}" "${dest}"
1203 local unionmountpoint="${1}" # directory where the union is mounted
1204 local unionrw="${2}" # branch where the union changes are stored
1205 local unionro1="${3}" # first underlying read-only branch (optional)
1206 local unionro2="${4}" # second underlying read-only branch (optional)
1208 if [ "${UNIONTYPE}" = "aufs" ]
1213 elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
1222 case "${UNIONTYPE}" in
1224 unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
1225 unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
1226 if [ -n "${unionro1}" ]
1228 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
1230 if [ -n "${unionro2}" ]
1232 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
1234 ( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
1235 unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
1236 ( mkdir -p /run/sendsigs.omit.d
1237 pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
1241 # XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
1242 # XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
1243 unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
1244 mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
1248 unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
1249 if [ -n "${unionro1}" ]
1251 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
1253 if [ -n "${unionro2}" ]
1255 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
1257 mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
1262 get_custom_mounts ()
1264 # Side-effect: leaves $devices with live-persistence.conf mounted in /live/persistence
1265 # Side-effect: prints info to file $custom_mounts
1267 local custom_mounts=${1}
1271 local bindings="/tmp/bindings.list"
1272 local links="/tmp/links.list"
1273 rm -rf ${bindings} ${links} 2> /dev/null
1275 for device in ${devices}
1277 if [ ! -b "${device}" ]
1282 local device_name="$(basename ${device})"
1283 local backing=$(mount_persistence_media ${device})
1284 if [ -z "${backing}" ]
1289 local include_list="${backing}/${persistence_list}"
1290 if [ ! -r "${include_list}" ]
1295 if [ -n "${DEBUG}" ] && [ -e "${include_list}" ]
1297 cp ${include_list} /live/persistence/${persistence_list}.${device_name}
1300 while read dir options # < ${include_list}
1302 if echo ${dir} | grep -qe "^[[:space:]]*\(#.*\)\?$"
1304 # skipping empty or commented lines
1308 if trim_path ${dir} | grep -q -e "^[^/]" -e "^/live\(/.*\)\?$" -e "^/\(.*/\)\?\.\.\?\(/.*\)\?$"
1310 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."
1316 for opt in $(echo ${options} | tr ',' ' ');
1320 opt_source=${opt#source=}
1328 log_warning_msg "Skipping custom mount with unkown option: ${opt}"
1334 local source="${dir}"
1335 if [ -n "${opt_source}" ]
1337 if echo ${opt_source} | grep -q -e "^/" -e "^\(.*/\)\?\.\.\?\(/.*\)\?$" && [ "${source}" != "." ]
1339 log_warning_msg "Skipping unsafe custom mount with option source=${opt_source}: must be either \".\" (the media root) or a relative path w.r.t. the media root that contains neither comas, nor the special \".\" and \"..\" path components"
1342 source="${opt_source}"
1346 local full_source="$(trim_path ${backing}/${source})"
1347 local full_dest="$(trim_path ${rootmnt}/${dir})"
1348 if [ -n "${opt_link}" ]
1350 echo "${device} ${full_source} ${full_dest} ${options}" >> ${links}
1352 echo "${device} ${full_source} ${full_dest} ${options}" >> ${bindings}
1354 done < ${include_list}
1357 # We sort the list according to destination so we're sure that
1358 # we won't hide a previous mount. We also ignore duplicate
1359 # destinations in a more or less arbitrary way.
1360 [ -e "${bindings}" ] && sort -k3 -sbu ${bindings} >> ${custom_mounts} && rm ${bindings}
1362 # After all mounts are considered we add symlinks so they
1363 # won't be hidden by some mount.
1364 [ -e "${links}" ] && cat ${links} >> ${custom_mounts} && rm ${links}
1366 # We need to make sure that no two custom mounts have the same sources
1367 # or are nested; if that is the case, too much weird stuff can happen.
1368 local prev_source="impossible source" # first iteration must not match
1370 # This sort will ensure that a source /a comes right before a source
1371 # /a/b so we only need to look at the previous source
1372 sort -k2 -b ${custom_mounts} |
1373 while read device source dest options
1375 if echo ${source} | grep -qe "^${prev_source}\(/.*\)\?$"
1377 panic "Two persistence mounts have the same or nested sources: ${source} on ${dest}, and ${prev_source} on ${prev_dest}"
1379 prev_source=${source}
1384 activate_custom_mounts ()
1386 local custom_mounts="${1}" # the ouput from get_custom_mounts()
1387 local used_devices=""
1389 while read device source dest options # < ${custom_mounts}
1391 local opt_bind="yes"
1394 for opt in $(echo ${options} | tr ',' ' ');
1399 unset opt_link opt_union
1403 unset opt_bind opt_union
1407 unset opt_bind opt_link
1412 if [ -n "$(what_is_mounted_on "${dest}")" ]
1414 if [ "${dest}" = "${rootmnt}" ]
1418 log_warning_msg "Skipping custom mount ${dest}: $(what_is_mounted_on "${dest}") is already mounted there"
1423 if [ ! -d "${dest}" ]
1425 # create the destination and delete existing files in
1426 # its path that are in the way
1428 for dir in $(echo ${dest} | sed -e 's|/\+| |g')
1430 path=$(trim_path ${path}/${dir})
1438 if echo ${path} | grep -qe "^${rootmnt}/*home/[^/]\+"
1440 # if ${dest} is in /home try fixing proper ownership by assuming that the intended user is the first, which is usually the case
1441 # FIXME: this should really be handled by live-config since we don't know for sure which uid a certain user has until then
1442 chown 1000:1000 ${path}
1448 # if ${source} doesn't exist on our persistence media
1449 # we bootstrap it with $dest from the live filesystem.
1450 # this both makes sense and is critical if we're
1451 # dealing with /etc or other system dir.
1452 if [ ! -d "${source}" ]
1454 if [ -n "${PERSISTENCE_READONLY}" ]
1457 elif [ -n "${opt_union}" ] || [ -n "${opt_link}" ]
1459 # unions and don't need to be bootstrapped
1460 # link dirs can't be bootstrapped in a sensible way
1461 mkdir -p "${source}"
1462 chown_ref "${dest}" "${source}"
1463 chmod_ref "${dest}" "${source}"
1464 elif [ -n "${opt_bind}" ]
1466 # ensure that $dest is not copied *into* $source
1467 mkdir -p "$(dirname ${source})"
1468 cp -a "${dest}" "${source}"
1472 # XXX: If CONFIG_AUFS_ROBR is added to the Debian kernel we can
1473 # ignore the loop below and set rofs_dest_backing=$dest
1474 local rofs_dest_backing=""
1475 if [ -n "${opt_link}"]
1477 for d in /live/rofs/*
1479 if [ -n "${rootmnt}" ]
1481 rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
1483 rofs_dest_backing="${d}/${dest}"
1485 if [ -d "${rofs_dest_backing}" ]
1489 rofs_dest_backing=""
1494 if [ -n "${opt_link}" ] && [ -z "${PERSISTENCE_READONLY}" ]
1496 link_files ${source} ${dest} ${rootmnt}
1497 elif [ -n "${opt_link}" ] && [ -n "${PERSISTENCE_READONLY}" ]
1499 mkdir -p /live/persistence
1500 local links_source=$(mktemp -d /live/persistence/links-source-XXXXXX)
1501 chown_ref ${source} ${links_source}
1502 chmod_ref ${source} ${links_source}
1503 # We put the cow dir in the below strange place to
1504 # make it absolutely certain that the link source
1505 # has its own directory and isn't nested with some
1506 # other custom mount (if so that mount's files would
1507 # be linked, causing breakage.
1508 local cow_dir="/live/overlay/live/persistence/$(basename ${links_source})"
1510 chown_ref "${source}" "${cow_dir}"
1511 chmod_ref "${source}" "${cow_dir}"
1512 do_union ${links_source} ${cow_dir} ${source} ${rofs_dest_backing}
1513 link_files ${links_source} ${dest} ${rootmnt}
1514 elif [ -n "${opt_union}" ] && [ -z "${PERSISTENCE_READONLY}" ]
1516 do_union ${dest} ${source} ${rofs_dest_backing}
1517 elif [ -n "${opt_bind}" ] && [ -z "${PERSISTENCE_READONLY}" ]
1519 mount --bind "${source}" "${dest}"
1520 elif [ -n "${opt_bind}" -o -n "${opt_union}" ] && [ -n "${PERSISTENCE_READONLY}" ]
1522 # bind-mount and union mount are handled the same
1523 # in read-only mode, but note that rofs_dest_backing
1524 # is non-empty (and necessary) only for unions
1525 if [ -n "${rootmnt}" ]
1527 local cow_dir="$(echo ${dest} | sed -e "s|^${rootmnt}|/live/overlay/|")"
1529 # This is happens if persistence is activated
1531 local cow_dir="/live/overlay/${dest}"
1533 if [ -e "${cow_dir}" ] && [ -z "${opt_link}" ]
1535 # If an earlier custom mount has files here
1536 # it will "block" the current mount's files
1537 # which is undesirable
1541 chown_ref "${source}" "${cow_dir}"
1542 chmod_ref "${source}" "${cow_dir}"
1543 do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
1546 PERSISTENCE_IS_ON="1"
1547 export PERSISTENCE_IS_ON
1549 if echo ${used_devices} | grep -qve "^\(.* \)\?${device}\( .*\)\?$"
1551 used_devices="${used_devices} ${device}"
1553 done < ${custom_mounts}
1555 echo ${used_devices}
1558 fix_backwards_compatibility ()
1564 if [ -n "${PERSISTENCE_READONLY}" ]
1569 local backing="$(mount_persistence_media ${device})"
1570 if [ -z "${backing}" ]
1575 local include_list="${backing}/${persistence_list}"
1576 if [ ! -r "${include_list}" ]
1578 echo "# persistence backwards compatibility:
1579 ${dir} ${opt},source=." > "${include_list}"
1587 [ $(stat -fc%d:%D "${directory}") != $(stat -fc%d:%D "${directory}/..") ]