scripts/live-helpers

   1 # live-boot helper functions, used by live-boot on boot and by live-snapshot
   2
   3 if [ ! -x "/bin/fstype" ]
   4 then
   5         # klibc not in path -> not in initramfs
   6         export PATH="${PATH}:/usr/lib/klibc/bin"
   7 fi
   8
   9 # handle upgrade path from old udev (using udevinfo) to
  10 # recent versions of udev (using udevadm info)
  11 if [ -x /sbin/udevadm ]
  12 then
  13         udevinfo='/sbin/udevadm info'
  14 else
  15         udevinfo='udevinfo'
  16 fi
  17
  18 sys2dev ()
  19 {
  20         sysdev=${1#/sys}
  21         echo "/dev/$($udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
  22 }
  23
  24 subdevices ()
  25 {
  26         sysblock=${1}
  27         r=""
  28
  29         for dev in "${sysblock}"/* "${sysblock}"
  30         do
  31                 if [ -e "${dev}/dev" ]
  32                 then
  33                         r="${r} ${dev}"
  34                 fi
  35         done
  36
  37         echo ${r}
  38 }
  39
  40 storage_devices()
  41 {
  42         black_listed_devices="${1}"
  43         white_listed_devices="${2}"
  44
  45         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "loop|ram|fd")
  46         do
  47                 fulldevname=$(sys2dev "${sysblock}")
  48
  49                 if echo "${black_listed_devices}" | grep -qe "\<${fulldevname}\>" || \
  50                         [ -n "${white_listed_devices}" ] && \
  51                         echo "${white_listed_devices}" | grep -qve "\<${fulldevname}\>"
  52                 then
  53                         # skip this device entirely
  54                         continue
  55                 fi
  56
  57                 for dev in $(subdevices "${sysblock}")
  58                 do
  59                         devname=$(sys2dev "${dev}")
  60
  61                         if echo "${black_listed_devices}" | grep -qe "\<${devname}\>"
  62                         then
  63                                 # skip this subdevice
  64                                 continue
  65                         else
  66                                 echo "${devname}"
  67                         fi
  68                 done
  69         done
  70 }
  71
  72 is_supported_fs ()
  73 {
  74         fstype="${1}"
  75
  76         # Validate input first
  77         if [ -z "${fstype}" ]
  78         then
  79                 return 1
  80         fi
  81
  82         # Try to look if it is already supported by the kernel
  83         if grep -q ${fstype} /proc/filesystems
  84         then
  85                 return 0
  86         else
  87                 # Then try to add support for it the gentle way using the initramfs capabilities
  88                 modprobe ${fstype}
  89                 if grep -q ${fstype} /proc/filesystems
  90                 then
  91                         return 0
  92                 # Then try the hard way if /root is already reachable
  93                 else
  94                         kmodule="/root/lib/modules/`uname -r`/${fstype}/${fstype}.ko"
  95                         if [ -e "${kmodule}" ]
  96                         then
  97                                 insmod "${kmodule}"
  98                                 if grep -q ${fstype} /proc/filesystems
  99                                 then
 100                                         return 0
 101                                 fi
 102                         fi
 103                 fi
 104         fi
 105
 106         return 1
 107 }
 108
 109 get_fstype ()
 110 {
 111         /sbin/blkid -s TYPE -o value $1 2>/dev/null
 112 }
 113
 114 where_is_mounted ()
 115 {
 116         device=${1}
 117
 118         if grep -q "^${device} " /proc/mounts
 119         then
 120                 # return the first found
 121                 grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
 122         fi
 123 }
 124
 125 lastline ()
 126 {
 127         while read lines
 128         do
 129                 line=${lines}
 130         done
 131
 132         echo "${line}"
 133 }
 134
 135 base_path ()
 136 {
 137         testpath="${1}"
 138         mounts="$(awk '{print $2}' /proc/mounts)"
 139         testpath="$(busybox realpath ${testpath})"
 140
 141         while true
 142         do
 143                 if echo "${mounts}" | grep -qs "^${testpath}"
 144                 then
 145                         set -- $(echo "${mounts}" | grep "^${testpath}" | lastline)
 146                         echo ${1}
 147                         break
 148                 else
 149                         testpath=$(dirname $testpath)
 150                 fi
 151         done
 152 }
 153
 154 fs_size ()
 155 {
 156         # Returns used/free fs kbytes + 5% more
 157         # You could pass a block device as ${1} or the mount point as ${2}
 158
 159         dev="${1}"
 160         mountp="${2}"
 161         used="${3}"
 162
 163         if [ -z "${mountp}" ]
 164         then
 165                 mountp="$(where_is_mounted ${dev})"
 166
 167                 if [ -z "${mountp}" ]
 168                 then
 169                         mountp="/mnt/tmp_fs_size"
 170
 171                         mkdir -p "${mountp}"
 172                         mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
 173
 174                         doumount=1
 175                 fi
 176         fi
 177
 178         if [ "${used}" = "used" ]
 179         then
 180                 size=$(du -ks ${mountp} | cut -f1)
 181                 size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
 182         else
 183                 # free space
 184                 size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
 185         fi
 186
 187         if [ -n "${doumount}" ]
 188         then
 189                 umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
 190                 rmdir "${mountp}"
 191         fi
 192
 193         echo "${size}"
 194 }
 195
 196 load_keymap ()
 197 {
 198         # Load custom keymap
 199         if [ -x /bin/loadkeys -a -r /etc/boottime.kmap.gz ]
 200         then
 201                 loadkeys /etc/boottime.kmap.gz
 202         fi
 203 }
 204
 205 setup_loop ()
 206 {
 207         local fspath=${1}
 208         local module=${2}
 209         local pattern=${3}
 210         local offset=${4}
 211         local encryption=${5}
 212         local readonly=${6}
 213
 214         # the output of setup_loop is evaluated in other functions,
 215         # modprobe leaks kernel options like "libata.dma=0"
 216         # as "options libata dma=0" on stdout, causing serious
 217         # problems therefor, so instead always avoid output to stdout
 218         modprobe -q -b "${module}" 1>/dev/null
 219
 220         udevadm settle
 221
 222         for loopdev in ${pattern}
 223         do
 224                 if [ "$(cat ${loopdev}/size)" -eq 0 ]
 225                 then
 226                         dev=$(sys2dev "${loopdev}")
 227                         options=''
 228
 229                         if [ -n "${readonly}" ]
 230                         then
 231                                 if losetup --help 2>&1 | grep -q -- "-r\b"
 232                                 then
 233                                         options="${options} -r"
 234                                 fi
 235                         fi
 236
 237                         if [ -n "${offset}" ] && [ 0 -lt "${offset}" ]
 238                         then
 239                                 options="${options} -o ${offset}"
 240                         fi
 241
 242                         if [ -z "${encryption}" ]
 243                         then
 244                                 losetup ${options} "${dev}" "${fspath}"
 245                         else
 246                                 # Loop AES encryption
 247                                 while true
 248                                 do
 249                                         load_keymap
 250
 251                                         echo -n "Enter passphrase for root filesystem: " >&6
 252                                         read -s passphrase
 253                                         echo "${passphrase}" > /tmp/passphrase
 254                                         unset passphrase
 255                                         exec 9</tmp/passphrase
 256                                         /sbin/losetup ${options} -e "${encryption}" -p 9 "${dev}" "${fspath}"
 257                                         error=${?}
 258                                         exec 9<&-
 259                                         rm -f /tmp/passphrase
 260
 261                                         if [ 0 -eq ${error} ]
 262                                         then
 263                                                 unset error
 264                                                 break
 265                                         fi
 266
 267                                         echo
 268                                         echo -n "There was an error decrypting the root filesystem ... Retry? [Y/n] " >&6
 269                                         read answer
 270
 271                                         if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
 272                                         then
 273                                                 unset answer
 274                                                 break
 275                                         fi
 276                                 done
 277                         fi
 278
 279                         echo "${dev}"
 280                         return 0
 281                 fi
 282         done
 283
 284         panic "No loop devices available"
 285 }
 286
 287 try_mount ()
 288 {
 289         dev="${1}"
 290         mountp="${2}"
 291         opts="${3}"
 292         fstype="${4}"
 293
 294         old_mountp="$(where_is_mounted ${dev})"
 295
 296         if [ -n "${old_mountp}" ]
 297         then
 298                 if [ "${opts}" != "ro" ]
 299                 then
 300                         mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
 301                 fi
 302
 303                 mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
 304         else
 305                 if [ -z "${fstype}" ]
 306                 then
 307                         fstype=$(get_fstype "${dev}")
 308                 fi
 309                 mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || \
 310                 ( echo "SKIPPING: Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}" > live-boot.log && return 0 )
 311         fi
 312 }
 313
 314 open_luks_device ()
 315 {
 316         dev="${1}"
 317         name="$(basename ${dev})"
 318         opts="--key-file=-"
 319         if [ -n "${PERSISTENT_READONLY}" ]
 320         then
 321                 opts="${opts} --readonly"
 322         fi
 323
 324         load_keymap
 325
 326         while true
 327         do
 328                 /lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | \
 329                         /sbin/cryptsetup -T 1 luksOpen ${dev} ${name} ${opts}
 330
 331                 if [ 0 -eq ${?} ]
 332                 then
 333                         luks_device="/dev/mapper/${name}"
 334                         echo ${luks_device}
 335                         return 0
 336                 fi
 337
 338                 echo >&6
 339                 echo -n "There was an error decrypting ${dev} ... Retry? [Y/n] " >&6
 340                 read answer
 341
 342                 if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
 343                 then
 344                         return 2
 345                 fi
 346         done
 347 }
 348
 349 find_persistent_media ()
 350 {
 351         # Scans devices for overlays and snapshots, and returns a whitespace
 352         # separated list of how to use them. Only overlays with a partition
 353         # label or file name in ${overlays} are returned, and ditto for
 354         # snapshots with labels in ${snapshots}.
 355         #
 356         # When scanning a LUKS device, the user will be asked to enter the
 357         # passphrase; on failure to enter it, or if no persistent partitions
 358         # or files were found, the LUKS device is closed.
 359         #
 360         # For a snapshot file the return value is ${label}=${snapdata}", where
 361         # ${snapdata} is the parameter used for try_snap().
 362         #
 363         # For all other cases (overlay/snapshot partition and overlay file) the
 364         # return value is "${label}=${device}", where ${device} a device that
 365         # can mount the content. In the case of an overlay file, the device
 366         # containing the file will remain mounted as a side-effect.
 367         #
 368         # No devices in ${black_listed_devices} will be scanned, and if
 369         # ${white_list_devices} is non-empty, only devices in it will be
 370         # scanned.
 371
 372         overlays="${1}"
 373         snapshots="${2}"
 374         black_listed_devices="${3}"
 375         white_listed_devices="${4}"
 376         persistent_backing="${rootmnt}/live/persistent"
 377
 378         for dev in $(storage_devices "${black_listed_devices}" "${white_listed_devices}")
 379         do
 380                 luks_device=""
 381
 382                 # Checking for a luks device
 383                 if echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
 384                    /sbin/cryptsetup isLuks ${dev}
 385                 then
 386                         if luks_device=$(open_luks_device "${dev}")
 387                         then
 388                                 dev="${luks_device}"
 389                         else
 390                                 # skip $dev since we failed/chose not to open it
 391                                 continue
 392                         fi
 393                 elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
 394                 then
 395                         # skip $dev since we don't allow unencrypted storage
 396                         continue
 397                 fi
 398
 399                 if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
 400                 then
 401                         for label in ${overlays} ${snapshots}
 402                         do
 403                                 if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
 404                                 then
 405                                         echo "${label}=${dev}"
 406                                         # skip to the next device
 407                                         continue 2
 408                                 fi
 409                         done
 410                 fi
 411
 412                 overlay_on_dev=""
 413                 snapshot_on_dev=""
 414                 if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
 415                 then
 416                         devfstype="$(get_fstype ${dev})"
 417                         backing="${persistent_backing}/$(basename ${dev})"
 418                         mkdir -p "${backing}"
 419                         if is_supported_fs ${devfstype} && try_mount "${dev}" "${backing}" "rw" "${devfstype}"
 420                         then
 421                                 for label in ${overlays}
 422                                 do
 423                                         path=${backing}/${PERSISTENT_PATH}${label}
 424                                         if [ -f "${path}" ]
 425                                         then
 426                                                 overlay_on_dev="yes"
 427                                                 echo "${label}=$(setup_loop "${path}" "loop" "/sys/block/loop*")"
 428                                         fi
 429                                 done
 430
 431                                 for label in ${snapshots}
 432                                 do
 433                                         for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
 434                                         do
 435                                                 path="${PERSISTENT_PATH}${label}.${ext}"
 436                                                 if [ -f "${backing}/${path}" ]
 437                                                 then
 438                                                         snapshot_on_dev="yes"
 439                                                         echo "${label}=${dev}:${backing}:${path}"
 440                                                 fi
 441                                         done
 442                                 done
 443                         fi
 444                         if [ -z "${overlay_on_dev}" ] && [ -z "${snapshot_on_dev}" ]
 445                         then
 446                                 umount ${backing} > /dev/null 2>&1 || true
 447                         fi
 448                 fi
 449                 if [ -z "${overlay_on_dev}" ] && [ -z "${snapshot_on_dev}" ] && \
 450                    [ -n "${luks_device}" ] && \
 451                    /sbin/cryptsetup status "${luks_device}" 1> /dev/null 2>&1
 452                 then
 453                         /sbin/cryptsetup luksClose "${luks_device}"
 454                 fi
 455         done
 456 }
 457
 458 get_mac ()
 459 {
 460         mac=""
 461
 462         for adaptor in /sys/class/net/*
 463         do
 464                 status="$(cat ${adaptor}/iflink)"
 465
 466                 if [ "${status}" -eq 2 ]
 467                 then
 468                         mac="$(cat ${adaptor}/address)"
 469                         mac="$(echo ${mac} | sed 's/:/-/g' | tr '[a-z]' '[A-Z]')"
 470                 fi
 471         done
 472
 473         echo ${mac}
 474 }
 475
 476 is_luks()
 477 {
 478     devname="${1}"
 479     if [ -x /sbin/cryptsetup ]
 480     then
 481         /sbin/cryptsetup isLuks "${devname}" 2>/dev/null || ret=${?}
 482         return ${ret}
 483     else
 484         return 1
 485     fi
 486
 487 }
 488
 489 removable_dev ()
 490 {
 491         output_format="${1}"
 492         want_usb="${2}"
 493         ret=
 494
 495         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
 496         do
 497                 dev_ok=
 498                 if [ "$(cat ${sysblock}/removable)" = "1" ]
 499                 then
 500                         if [ -z "${want_usb}" ]
 501                         then
 502                                 dev_ok="yes"
 503                         else
 504                                 if readlink ${sysblock} | grep -q usb
 505                                 then
 506                                         dev_ok="yes"
 507                                 fi
 508                         fi
 509                 fi
 510
 511                 if [ "${dev_ok}" = "yes" ]
 512                 then
 513                         case "${output_format}" in
 514                                 sys)
 515                                         ret="${ret} ${sysblock}"
 516                                         ;;
 517                                 *)
 518                                         devname=$(sys2dev "${sysblock}")
 519                                         ret="${ret} ${devname}"
 520                                         ;;
 521                         esac
 522                 fi
 523         done
 524
 525         echo "${ret}"
 526 }
 527
 528 removable_usb_dev ()
 529 {
 530         output_format="${1}"
 531
 532         removable_dev "${output_format}" "want_usb"
 533 }
 534
 535 non_removable_dev ()
 536 {
 537         output_format="${1}"
 538         ret=
 539
 540         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
 541         do
 542                 if [ "$(cat ${sysblock}/removable)" = "0" ]
 543                 then
 544                         case "${output_format}" in
 545                                 sys)
 546                                         ret="${ret} ${sysblock}"
 547                                         ;;
 548                                 *)
 549                                         devname=$(sys2dev "${sysblock}")
 550                                         ret="${ret} ${devname}"
 551                                         ;;
 552                         esac
 553                 fi
 554         done
 555
 556         echo "${ret}"
 557 }
 558
 559 link_files ()
 560 {
 561         # create source's directory structure in dest, and recursively
 562         # create symlinks in dest to to all files in source. if mask
 563         # is non-empty, remove mask from all source paths when
 564         # creating links (will be necessary if we change root, which
 565         # live-boot normally does (into $rootmnt)).
 566
 567         # remove multiple /:s and ensure ending on /
 568         local src_dir="$(echo "${1}"/ | sed -e 's|/\+|/|g')"
 569         local dest_dir="$(echo "${2}"/ | sed -e 's|/\+|/|g')"
 570         local src_mask="${3}"
 571
 572         # This check can only trigger on the inital, non-recursive call since
 573         # we create the destination before recursive calls
 574         if [ ! -d "${dest_dir}" ];
 575         then
 576                 log_warning_msg "Must link_files into a directory"
 577                 return
 578         fi
 579
 580         find "${src_dir}" -mindepth 1 -maxdepth 1 | while read x; do
 581                 local src="${x}"
 582                 local dest="${dest_dir}$(basename "${x}")"
 583                 if [ -d "${src}" ];
 584                 then
 585                         if [ -z "$(ls -A "${src}")" ];
 586                         then
 587                                 continue
 588                         fi
 589                         if [ ! -d "${dest}" ];
 590                         then
 591                                 mkdir -p "${dest}"
 592                                 prev="$(dirname "${dest}")"
 593                                 chown $(stat -c %u:%g "${prev}") "${dest}"
 594                                 chmod $(stat -c %a "${prev}") "${dest}"
 595                         fi
 596                         link_files "${src}" "${dest}" "${src_mask}"
 597                 else
 598                         if [ -n "${src_mask}" ]
 599                         then
 600                                 src="$(echo ${src} | sed "s|^${src_mask}||")"
 601                         fi
 602                         rm -rf "${dest}" 2> /dev/null
 603                         ln -s "${src}" "${dest}"
 604                 fi
 605         done
 606 }
 607
 608 do_union () {
 609         local unionmountpoint="${1}"    # directory where the union is mounted
 610         local unionrw="${2}"            # branch where the union changes are stored
 611         local unionro1="${3}"           # first underlying read-only branch (optional)
 612         local unionro2="${4}"           # second underlying read-only branch (optional)
 613
 614         if [ "${UNIONTYPE}" = "aufs" ]
 615         then
 616                 rw_opt="rw"
 617                 ro_opt="rr+wh"
 618                 noxino_opt="noxino"
 619         elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
 620         then
 621                 rw_opt="RW"
 622                 ro_opt="RO"
 623         else
 624                 rw_opt="rw"
 625                 ro_opt="ro"
 626         fi
 627
 628         case "${UNIONTYPE}" in
 629                 unionfs-fuse)
 630                         unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
 631                         unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
 632                         if [ -n "${unionro1}" ]
 633                         then
 634                                 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
 635                         fi
 636                         if [ -n "${unionro2}" ]
 637                         then
 638                                 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
 639                         fi
 640                         ( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
 641                         unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
 642                         ( mkdir -p /run/sendsigs.omit.d
 643                         pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
 644                         ;;
 645
 646                 overlayfs)
 647                         # XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
 648                         # XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
 649                         unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
 650                         mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
 651                         ;;
 652
 653                 *)
 654                         unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
 655                         if [ -n "${unionro1}" ]
 656                         then
 657                                 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
 658                         fi
 659                         if [ -n "${unionro2}" ]
 660                         then
 661                                 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
 662                         fi
 663                         mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
 664                         ;;
 665         esac
 666 }
 667
 668 get_custom_mounts () {
 669         # Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistent
 670         # Side-effect: prints info to file $custom_mounts
 671
 672         local devices="${1}"
 673         local custom_mounts="${2}" # print result to this file
 674         local rootmnt="${3}"       # should be set empty post-live-boot
 675
 676         local bindings="/bindings.list"
 677         local links="/links.list"
 678         rm -rf ${bindings} ${links} 2> /dev/null
 679         local persistent_backing="${rootmnt}/live/persistent"
 680
 681         for device in ${devices}
 682         do
 683                 if [ ! -b "${device}" ]
 684                 then
 685                         continue
 686                 fi
 687                 local device_name="$(basename ${device})"
 688                 local backing="${persistent_backing}/${device_name}"
 689                 mkdir -p "${backing}"
 690                 local device_fstype="$(get_fstype ${device})"
 691                 if [ -z "${PERSISTENT_READONLY}" ]
 692                 then
 693                         device_mount_opts="rw,noatime"
 694                 else
 695                         device_mount_opts="ro,noatime"
 696                 fi
 697                 local device_used=""
 698                 mount -t "${device_fstype}" -o "${device_mount_opts}" "${device}" "${backing}"
 699                 local include_list="${backing}/${persistence_list}"
 700                 if [ ! -r "${include_list}" ]
 701                 then
 702                         umount "${backing}"
 703                         rmdir "${backing}"
 704                         continue
 705                 fi
 706
 707                 [ "${DEBUG}" = "Yes" ] && cp ${include_list} ${persistent_backing}/${persistence_list}.${device_name}
 708                 while read source dest options # < ${include_list}
 709                 do
 710                         if echo ${source} | grep -qe "^[[:space:]]*\(#.*\)\?$"
 711                         then
 712                                 # skipping empty or commented lines
 713                                 continue
 714                         fi
 715
 716                         if echo ${dest} | grep -qe "^[^/]"
 717                         then
 718                                 options="${dest}"
 719                                 dest="${source}"
 720                         elif [ -z "${dest}" ]
 721                         then
 722                                 dest="${source}"
 723                         fi
 724
 725                         if echo ${dest} | grep -qe "^/\+$\|^/\+live\(/.*\)\?$"
 726                         then
 727                                 # mounting on / or /live could cause trouble
 728                                 log_warning_msg "Skipping unsafe custom mount on ${dest}"
 729                                 continue
 730                         fi
 731
 732                         for opt in $(echo ${options} | tr ',' ' ');
 733                         do
 734                                 case "${opt}" in
 735                                         linkfiles|union)
 736                                                 ;;
 737                                         *)
 738                                                 log_warning_msg "Skipping custom mount with unkown option: ${opt}"
 739                                                 continue 2
 740                                                 ;;
 741                                 esac
 742                         done
 743
 744                         # FIXME: handle case: we already have /a/b in
 745                         # $bindings added from current $device, but
 746                         # now we find /a -- /a should replace /a/b in
 747                         # $bindings.
 748
 749                         # FIXME: handle case: we have /a in $bindings
 750                         # from current $device, now we find /a/b, so
 751                         # we skip /a/b
 752
 753                         # ensure that no multiple-/ occur in paths
 754                         local full_source="$(echo ${backing}/${source}/ | sed -e 's|/\+|/|g')"
 755                         local full_dest="$(echo ${rootmnt}/${dest}/ | sed -e 's|/\+|/|g')"
 756                         device_used="yes"
 757                         if echo ${options} | grep -qe "\<linkfiles\>";
 758                         then
 759                                 echo "${full_source} ${full_dest} ${options}" >> ${links}
 760                         else
 761                                 echo "${full_source} ${full_dest} ${options}" >> ${bindings}
 762                         fi
 763                 done < ${include_list}
 764
 765                 if [ -z "${device_used}" ]
 766                 then
 767                         # this device was not used for / earlier, or
 768                         # custom mount point now, so it's useless
 769                         umount "${backing}"
 770                         rmdir "${backing}"
 771                 fi
 772         done
 773
 774         # We sort the list according to destination so we're sure that
 775         # we won't hide a previous mount. We also ignore duplicate
 776         # destinations in a more or less arbitrary way.
 777         [ -e "${bindings}" ] && sort -k2 -sbu ${bindings} >> ${custom_mounts}
 778         rm ${bindings}
 779
 780         # After all mounts are considered we add symlinks so they
 781         # won't be hidden by some mount.
 782         [ -e "${links}" ] && sort -k2 -sbu ${links} >> ${custom_mounts}
 783         rm ${links}
 784
 785         rm -f ${bindings} ${links} 2> /dev/null
 786         echo ${custom_mounts}
 787 }
 788
 789 do_custom_mounts () {
 790         local custom_mounts="${1}" # the ouput from get_custom_mounts()
 791         local rootmnt="${2}"       # should be set empty post-live-boot
 792
 793         while read source dest options # < ${custom_mounts}
 794         do
 795                 local opt_linkfiles=""
 796                 local opt_union=""
 797                 for opt in $(echo ${options} | tr ',' ' ');
 798                 do
 799                          case "${opt}" in
 800                                 linkfiles)
 801                                         opt_linkfiles="yes"
 802                                         ;;
 803                                 union)
 804                                         opt_union="yes"
 805                                         ;;
 806                         esac
 807                 done
 808
 809                 if mountpoint -q "${dest}";
 810                 then
 811                         log_warning_msg "Skipping custom mount ${source} on ${dest}: destination is already a mount point"
 812                         continue
 813                 fi
 814
 815                 # FIXME: we don't handle already existing
 816                 # non-directory files in the paths of both $source and
 817                 # $dest.
 818
 819                 if [ ! -d "${dest}" ]
 820                 then
 821                         # if ${dest} is in /home/$user, try fixing
 822                         # proper ownership
 823                         # FIXME: this should really be handled by
 824                         # live-config since we don't know for sure
 825                         # which uid a certain user has until then
 826                         if echo ${dest} | grep -qe "^${rootmnt}/*home/\+[^/]\+"
 827                         then
 828                                 path="/"
 829                                 for dir in $(echo ${dest} | sed -e 's|/\+| |g')
 830                                 do
 831                                         path=${path}/${dir}
 832                                         if [ ! -e ${path} ]
 833                                         then
 834                                                 mkdir -p ${path}
 835                                                 # assume that the intended user is the first, which is usually the case
 836                                                 chown 1000:1000 ${path}
 837                                         fi
 838                                 done
 839                         else
 840                                 mkdir -p ${dest}
 841                         fi
 842                 fi
 843
 844                 # if ${source} doesn't exist on our persistent media
 845                 # we bootstrap it with $dest from the live filesystem.
 846                 # this both makes sense and is critical if we're
 847                 # dealing with /etc or other system dir.
 848                 if [ ! -d "${source}" ]
 849                 then
 850                         if [ -n "${PERSISTENT_READONLY}" ] || [ -n "${opt_linkfiles}" ]
 851                         then
 852                                 continue
 853                         elif [ -n "${opt_union}" ]
 854                         then
 855                                 # union's don't need to be bootstrapped
 856                                 mkdir "${source}"
 857                         else
 858                                 # ensure that $dest is not copied *into* $source
 859                                 mkdir -p "$(dirname ${source})"
 860                                 cp -a "${dest}" "${source}"
 861                         fi
 862                 fi
 863
 864                 rofs_dest_backing=""
 865                 for d in ${rootmnt}/live/rofs/*
 866                 do
 867                         if [ -n "${rootmnt}" ]
 868                         then
 869                                 rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
 870                         else
 871                                 rofs_dest_backing="${d}/${dest}"
 872
 873                         fi
 874                         if [ -d "${rofs_dest_backing}" ]
 875                         then
 876                                 break
 877                         else
 878                                 rofs_dest_backing=""
 879                         fi
 880                 done
 881
 882                 if [ -z "${PERSISTENT_READONLY}" ]
 883                 then
 884                         if [ -n "${opt_linkfiles}" ]
 885                         then
 886                                 links_source="${source}"
 887                                 links_dest="${dest}"
 888                         elif [ -n "${opt_union}" ]
 889                         then
 890                                 do_union ${dest} ${source} ${rofs_dest_backing}
 891                         else
 892                                 mount --bind "${source}" "${dest}"
 893                         fi
 894                 else
 895                         if [ -n "${opt_linkfiles}" ]
 896                         then
 897                                 links_dest="${dest}"
 898                                 dest="$(mktemp -d ${persistent_backing}/links_source-XXXXXX)"
 899                                 links_source="${dest}"
 900                         fi
 901                         if [ -n "${rootmnt}" ]
 902                         then
 903                                 cow_dir="$(echo ${dest} | sed -e "s|${rootmnt}|/cow/|")"
 904                         else
 905                                 cow_dir="/live/cow/${dest}"
 906                         fi
 907                         mkdir -p ${cow_dir}
 908                         do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
 909                 fi
 910
 911                 if [ -n "${opt_linkfiles}" ]
 912                 then
 913                         link_files "${links_source}" "${links_dest}" "${rootmnt}"
 914                 fi
 915
 916                 PERSISTENCE_IS_ON="1"
 917                 export PERSISTENCE_IS_ON
 918         done < ${custom_mounts}
 919 }