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 root_overlay_label="full-ov"
  19 old_root_overlay_label="live-rw"
  20 old_home_overlay_label="home-rw"
  21 custom_overlay_label="custom-ov"
  22 root_snapshot_label="live-sn"
  23 old_root_snapshot_label="live-sn"
  24 home_snapshot_label="home-sn"
  25 persistence_list="live.persist"
  26
  27 Arguments ()
  28 {
  29         PRESEEDS=""
  30         LOCATIONS=""
  31
  32         for ARGUMENT in $(cat /proc/cmdline)
  33         do
  34                 case "${ARGUMENT}" in
  35                         skipconfig)
  36                                 NOACCESSIBILITY="Yes"
  37                                 NOFASTBOOT="Yes"
  38                                 NOFSTAB="Yes"
  39                                 NONETWORKING="Yes"
  40
  41                                 export NOACCESSIBILITY NOFASTBOOT NOFSTAB NONETWORKING
  42                                 ;;
  43
  44                         access=*)
  45                                 ACCESS="${ARGUMENT#access=}"
  46                                 export ACCESS
  47                                 ;;
  48
  49                         console=*)
  50                                 DEFCONSOLE="${ARGUMENT#*=}"
  51                                 export DEFCONSOLE
  52                                 ;;
  53
  54                         BOOTIF=*)
  55                                 BOOTIF="${x#BOOTIF=}"
  56                                 ;;
  57
  58                         debug)
  59                                 DEBUG="Yes"
  60                                 export DEBUG
  61
  62                                 set -x
  63                                 ;;
  64
  65                         dhcp)
  66                                 # Force dhcp even while netbooting
  67                                 # Use for debugging in case somebody works on fixing dhclient
  68                                 DHCP="Force";
  69                                 export DHCP
  70                                 ;;
  71
  72                         nodhcp)
  73                                 unset DHCP
  74                                 ;;
  75
  76                         ethdevice=*)
  77                                 DEVICE="${ARGUMENT#ethdevice=}"
  78                                 ETHDEVICE="${DEVICE}"
  79                                 export DEVICE ETHDEVICE
  80                                 ;;
  81
  82                         ethdevice-timeout=*)
  83                                 ETHDEV_TIMEOUT="${ARGUMENT#ethdevice-timeout=}"
  84                                 export ETHDEV_TIMEOUT
  85                                 ;;
  86
  87                         fetch=*)
  88                                 FETCH="${ARGUMENT#fetch=}"
  89                                 export FETCH
  90                                 ;;
  91
  92                         forcepersistentfsck)
  93                                 FORCEPERSISTENTFSCK="Yes"
  94                                 export FORCEPERSISTENTFSCK
  95                                 ;;
  96
  97                         ftpfs=*)
  98                                 FTPFS="${ARGUMENT#ftpfs=}"
  99                                 export FTPFS
 100                                 ;;
 101
 102                         httpfs=*)
 103                                 HTTPFS="${ARGUMENT#httpfs=}"
 104                                 export HTTPFS
 105                                 ;;
 106
 107                         iscsi=*)
 108                                 ISCSI="${ARGUMENT#iscsi=}"
 109                                 #ip:port - separated by ;
 110                                 ISCSI_PORTAL="${ISCSI%;*}"
 111                                 if echo "${ISCSI_PORTAL}" | grep -q , ; then
 112                                         ISCSI_SERVER="${ISCSI_PORTAL%,*}"
 113                                         ISCSI_PORT="${ISCSI_PORTAL#*,}"
 114                                 fi
 115                                 #target name
 116                                 ISCSI_TARGET="${ISCSI#*;}"
 117                                 export ISCSI ISCSI_PORTAL ISCSI_TARGET ISCSI_SERVER ISCSI_PORT
 118                                 ;;
 119
 120                         isofrom=*|fromiso=*)
 121                                 FROMISO="${ARGUMENT#*=}"
 122                                 export FROMISO
 123                                 ;;
 124
 125                         ignore_uuid)
 126                                 IGNORE_UUID="Yes"
 127                                 export IGNORE_UUID
 128                                 ;;
 129
 130                         integrity-check)
 131                                 INTEGRITY_CHECK="Yes"
 132                                 export INTEGRITY_CHECK
 133                                 ;;
 134
 135                         ip=*)
 136                                 STATICIP="${ARGUMENT#ip=}"
 137
 138                                 if [ -z "${STATICIP}" ]
 139                                 then
 140                                         STATICIP="frommedia"
 141                                 fi
 142
 143                                 export STATICIP
 144                                 ;;
 145
 146                         live-getty)
 147                                 LIVE_GETTY="1"
 148                                 export LIVE_GETTY
 149                                 ;;
 150
 151                         live-media=*|bootfrom=*)
 152                                 LIVE_MEDIA="${ARGUMENT#*=}"
 153                                 export LIVE_MEDIA
 154                                 ;;
 155
 156                         live-media-encryption=*|encryption=*)
 157                                 LIVE_MEDIA_ENCRYPTION="${ARGUMENT#*=}"
 158                                 export LIVE_MEDIA_ENCRYPTION
 159                                 ;;
 160
 161                         live-media-offset=*)
 162                                 LIVE_MEDIA_OFFSET="${ARGUMENT#live-media-offset=}"
 163                                 export LIVE_MEDIA_OFFSET
 164                                 ;;
 165
 166                         live-media-path=*)
 167                                 LIVE_MEDIA_PATH="${ARGUMENT#live-media-path=}"
 168                                 export LIVE_MEDIA_PATH
 169                                 ;;
 170
 171                         live-media-timeout=*)
 172                                 LIVE_MEDIA_TIMEOUT="${ARGUMENT#live-media-timeout=}"
 173                                 export LIVE_MEDIA_TIMEOUT
 174                                 ;;
 175
 176                         module=*)
 177                                 MODULE="${ARGUMENT#module=}"
 178                                 export MODULE
 179                                 ;;
 180
 181                         netboot=*)
 182                                 NETBOOT="${ARGUMENT#netboot=}"
 183                                 export NETBOOT
 184                                 ;;
 185
 186                         nfsopts=*)
 187                                 NFSOPTS="${ARGUMENT#nfsopts=}"
 188                                 export NFSOPTS
 189                                 ;;
 190
 191                         nfscow=*)
 192                                 NFS_COW="${ARGUMENT#nfscow=}"
 193                                 export NFS_COW
 194                                 ;;
 195
 196                         noaccessibility)
 197                                 NOACCESSIBILITY="Yes"
 198                                 export NOACCESSIBILITY
 199                                 ;;
 200
 201                         nofastboot)
 202                                 NOFASTBOOT="Yes"
 203                                 export NOFASTBOOT
 204                                 ;;
 205
 206                         nofstab)
 207                                 NOFSTAB="Yes"
 208                                 export NOFSTAB
 209                                 ;;
 210
 211                         nonetworking)
 212                                 NONETWORKING="Yes"
 213                                 export NONETWORKING
 214                                 ;;
 215
 216                         ramdisk-size=*)
 217                                 ramdisk_size="${ARGUMENT#ramdisk-size=}"
 218                                 ;;
 219
 220                         swapon)
 221                                 SWAPON="Yes"
 222                                 export SWAPON
 223                                 ;;
 224
 225                         persistent)
 226                                 PERSISTENT="Yes"
 227                                 export PERSISTENT
 228                                 ;;
 229
 230                         persistent-encryption=*)
 231                                 PERSISTENT_ENCRYPTION="${ARGUMENT#*=}"
 232                                 export PERSISTENT_ENCRYPTION
 233                                 ;;
 234
 235                         persistent-media=*)
 236                                 PERSISTENT_MEDIA="${ARGUMENT#*=}"
 237                                 export PERSISTENT_MEDIA
 238                                 ;;
 239                         persistent-method=*)
 240                                 PERSISTENT_METHOD="${ARGUMENT#*=}"
 241                                 export PERSISTENT_METHOD
 242                                 ;;
 243
 244                         persistent-path=*)
 245                                 PERSISTENT_PATH="${ARGUMENT#persistent-path=}"
 246                                 export PERSISTENT_PATH
 247                                 ;;
 248                         persistent-read-only)
 249                                 PERSISTENT_READONLY="Yes"
 250                                 export PERSISTENT_READONLY
 251                                 ;;
 252
 253                         persistent-storage=*)
 254                                 PERSISTENT_STORAGE="${ARGUMENT#persistent-storage=}"
 255                                 export PERSISTENT_STORAGE
 256                                 ;;
 257
 258                         persistent-subtext=*)
 259                                 root_overlay_label="${root_overlay_label}-${ARGUMENT#persistent-subtext=}"
 260                                 old_root_overlay_label="${old_root_overlay_label}-${ARGUMENT#persistent-subtext=}"
 261                                 old_home_overlay_label="${old_home_overlay_label}-${ARGUMENT#persistent-subtext=}"
 262                                 custom_overlay_label="${custom_overlay_label}-${ARGUMENT#persistent-subtext=}"
 263                                 root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistent-subtext=}"
 264                                 old_root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistent-subtext=}"
 265                                 home_snapshot_label="${home_snapshot_label}-${ARGUMENT#persistent-subtext=}"
 266                                 ;;
 267
 268                         nopersistent)
 269                                 NOPERSISTENT="Yes"
 270                                 export NOPERSISTENT
 271                                 ;;
 272
 273                         noprompt)
 274                                 NOPROMPT="Yes"
 275                                 export NOPROMPT
 276                                 ;;
 277
 278                         noprompt=*)
 279                                 NOPROMPT="${ARGUMENT#noprompt=}"
 280                                 export NOPROMPT
 281                                 ;;
 282
 283                         quickusbmodules)
 284                                 QUICKUSBMODULES="Yes"
 285                                 export QUICKUSBMODULES
 286                                 ;;
 287
 288                         preseed/file=*|file=*)
 289                                 LOCATIONS="${ARGUMENT#*=} ${LOCATIONS}"
 290                                 export LOCATIONS
 291                                 ;;
 292
 293                         nopreseed)
 294                                 NOPRESEED="Yes"
 295                                 export NOPRESEED
 296                                 ;;
 297
 298                         */*=*)
 299                                 question="${ARGUMENT%%=*}"
 300                                 value="${ARGUMENT#*=}"
 301                                 PRESEEDS="${PRESEEDS}\"${question}=${value}\" "
 302                                 export PRESEEDS
 303                                 ;;
 304
 305                         showmounts)
 306                                 SHOWMOUNTS="Yes"
 307                                 export SHOWMOUNTS
 308                                 ;;
 309
 310                         silent)
 311                                 SILENT="Yes"
 312                                 export SILENT
 313                                 ;;
 314
 315                         todisk=*)
 316                                 TODISK="${ARGUMENT#todisk=}"
 317                                 export TODISK
 318                                 ;;
 319
 320                         toram)
 321                                 TORAM="Yes"
 322                                 export TORAM
 323                                 ;;
 324
 325                         toram=*)
 326                                 TORAM="Yes"
 327                                 MODULETORAM="${ARGUMENT#toram=}"
 328                                 export TORAM MODULETORAM
 329                                 ;;
 330
 331                         exposedroot)
 332                                 EXPOSED_ROOT="Yes"
 333                                 export EXPOSED_ROOT
 334                                 ;;
 335
 336                         plainroot)
 337                                 PLAIN_ROOT="Yes"
 338                                 export PLAIN_ROOT
 339                                 ;;
 340
 341                         skipunion)
 342                                 SKIP_UNION_MOUNTS="Yes"
 343                                 export SKIP_UNION_MOUNTS
 344                                 ;;
 345
 346                         root=*)
 347                                 ROOT="${ARGUMENT#root=}"
 348                                 export ROOT
 349                                 ;;
 350
 351                         union=*)
 352                                 UNIONTYPE="${ARGUMENT#union=}"
 353                                 export UNIONTYPE
 354                                 ;;
 355                 esac
 356         done
 357
 358         # sort of compatibility with netboot.h from linux docs
 359         if [ -z "${NETBOOT}" ]
 360         then
 361                 if [ "${ROOT}" = "/dev/nfs" ]
 362                 then
 363                         NETBOOT="nfs"
 364                         export NETBOOT
 365                 elif [ "${ROOT}" = "/dev/cifs" ]
 366                 then
 367                         NETBOOT="cifs"
 368                         export NETBOOT
 369                 fi
 370         fi
 371
 372         if [ -z "${MODULE}" ]
 373         then
 374                 MODULE="filesystem"
 375                 export MODULE
 376         fi
 377
 378         if [ -z "${UNIONTYPE}" ]
 379         then
 380                 UNIONTYPE="aufs"
 381                 export UNIONTYPE
 382         fi
 383
 384         if [ -z "${PERSISTENT_ENCRYPTION}" ]
 385         then
 386                 PERSISTENT_ENCRYPTION="none"
 387                 export PERSISTENT_ENCRYPTION
 388         elif echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>"
 389         then
 390                 if ! modprobe dm-crypt
 391                 then
 392                         log_warning_msg "Unable to load module dm-crypt"
 393                         PERSISTENT_ENCRYPTION=$(echo ${PERSISTENT_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
 394                         export PERSISTENT_ENCRYPTION
 395                 fi
 396
 397                 if [ ! -x /lib/cryptsetup/askpass ] || [ ! -x /sbin/cryptsetup ]
 398                 then
 399                         log_warning_msg "cryptsetup in unavailable"
 400                         PERSISTENT_ENCRYPTION=$(echo ${PERSISTENT_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
 401                         export PERSISTENT_ENCRYPTION
 402                 fi
 403         fi
 404
 405         if [ -z "${PERSISTENT_METHOD}" ]
 406         then
 407                 PERSISTENT_METHOD="snapshot,overlay"
 408                 export PERSISTENT_METHOD
 409         fi
 410
 411         if [ -z "${PERSISTENT_STORAGE}" ]
 412         then
 413                 PERSISTENT_STORAGE="filesystem,file"
 414                 export PERSISTENT_STORAGE
 415         fi
 416 }
 417
 418 sys2dev ()
 419 {
 420         sysdev=${1#/sys}
 421         echo "/dev/$($udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
 422 }
 423
 424 subdevices ()
 425 {
 426         sysblock=${1}
 427         r=""
 428
 429         for dev in "${sysblock}"/* "${sysblock}"
 430         do
 431                 if [ -e "${dev}/dev" ]
 432                 then
 433                         r="${r} ${dev}"
 434                 fi
 435         done
 436
 437         echo ${r}
 438 }
 439
 440 storage_devices()
 441 {
 442         black_listed_devices="${1}"
 443         white_listed_devices="${2}"
 444
 445         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "loop|ram|fd")
 446         do
 447                 fulldevname=$(sys2dev "${sysblock}")
 448
 449                 if echo "${black_listed_devices}" | grep -qe "\<${fulldevname}\>" || \
 450                         [ -n "${white_listed_devices}" ] && \
 451                         echo "${white_listed_devices}" | grep -qve "\<${fulldevname}\>"
 452                 then
 453                         # skip this device entirely
 454                         continue
 455                 fi
 456
 457                 for dev in $(subdevices "${sysblock}")
 458                 do
 459                         devname=$(sys2dev "${dev}")
 460
 461                         if echo "${black_listed_devices}" | grep -qe "\<${devname}\>"
 462                         then
 463                                 # skip this subdevice
 464                                 continue
 465                         else
 466                                 echo "${devname}"
 467                         fi
 468                 done
 469         done
 470 }
 471
 472 is_supported_fs ()
 473 {
 474         fstype="${1}"
 475
 476         # Validate input first
 477         if [ -z "${fstype}" ]
 478         then
 479                 return 1
 480         fi
 481
 482         # Try to look if it is already supported by the kernel
 483         if grep -q ${fstype} /proc/filesystems
 484         then
 485                 return 0
 486         else
 487                 # Then try to add support for it the gentle way using the initramfs capabilities
 488                 modprobe ${fstype}
 489                 if grep -q ${fstype} /proc/filesystems
 490                 then
 491                         return 0
 492                 # Then try the hard way if /root is already reachable
 493                 else
 494                         kmodule="/root/lib/modules/`uname -r`/${fstype}/${fstype}.ko"
 495                         if [ -e "${kmodule}" ]
 496                         then
 497                                 insmod "${kmodule}"
 498                                 if grep -q ${fstype} /proc/filesystems
 499                                 then
 500                                         return 0
 501                                 fi
 502                         fi
 503                 fi
 504         fi
 505
 506         return 1
 507 }
 508
 509 get_fstype ()
 510 {
 511         /sbin/blkid -s TYPE -o value $1 2>/dev/null
 512 }
 513
 514 where_is_mounted ()
 515 {
 516         device=${1}
 517
 518         if grep -q "^${device} " /proc/mounts
 519         then
 520                 # return the first found
 521                 grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
 522         fi
 523 }
 524
 525 lastline ()
 526 {
 527         while read lines
 528         do
 529                 line=${lines}
 530         done
 531
 532         echo "${line}"
 533 }
 534
 535 base_path ()
 536 {
 537         testpath="${1}"
 538         mounts="$(awk '{print $2}' /proc/mounts)"
 539         testpath="$(busybox realpath ${testpath})"
 540
 541         while true
 542         do
 543                 if echo "${mounts}" | grep -qs "^${testpath}"
 544                 then
 545                         set -- $(echo "${mounts}" | grep "^${testpath}" | lastline)
 546                         echo ${1}
 547                         break
 548                 else
 549                         testpath=$(dirname $testpath)
 550                 fi
 551         done
 552 }
 553
 554 fs_size ()
 555 {
 556         # Returns used/free fs kbytes + 5% more
 557         # You could pass a block device as ${1} or the mount point as ${2}
 558
 559         dev="${1}"
 560         mountp="${2}"
 561         used="${3}"
 562
 563         if [ -z "${mountp}" ]
 564         then
 565                 mountp="$(where_is_mounted ${dev})"
 566
 567                 if [ -z "${mountp}" ]
 568                 then
 569                         mountp="/mnt/tmp_fs_size"
 570
 571                         mkdir -p "${mountp}"
 572                         mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
 573
 574                         doumount=1
 575                 fi
 576         fi
 577
 578         if [ "${used}" = "used" ]
 579         then
 580                 size=$(du -ks ${mountp} | cut -f1)
 581                 size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
 582         else
 583                 # free space
 584                 size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
 585         fi
 586
 587         if [ -n "${doumount}" ]
 588         then
 589                 umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
 590                 rmdir "${mountp}"
 591         fi
 592
 593         echo "${size}"
 594 }
 595
 596 load_keymap ()
 597 {
 598         # Load custom keymap
 599         if [ -x /bin/loadkeys -a -r /etc/boottime.kmap.gz ]
 600         then
 601                 loadkeys /etc/boottime.kmap.gz
 602         fi
 603 }
 604
 605 setup_loop ()
 606 {
 607         local fspath=${1}
 608         local module=${2}
 609         local pattern=${3}
 610         local offset=${4}
 611         local encryption=${5}
 612         local readonly=${6}
 613
 614         # the output of setup_loop is evaluated in other functions,
 615         # modprobe leaks kernel options like "libata.dma=0"
 616         # as "options libata dma=0" on stdout, causing serious
 617         # problems therefor, so instead always avoid output to stdout
 618         modprobe -q -b "${module}" 1>/dev/null
 619
 620         udevadm settle
 621
 622         for loopdev in ${pattern}
 623         do
 624                 if [ "$(cat ${loopdev}/size)" -eq 0 ]
 625                 then
 626                         dev=$(sys2dev "${loopdev}")
 627                         options=''
 628
 629                         if [ -n "${readonly}" ]
 630                         then
 631                                 if losetup --help 2>&1 | grep -q -- "-r\b"
 632                                 then
 633                                         options="${options} -r"
 634                                 fi
 635                         fi
 636
 637                         if [ -n "${offset}" ] && [ 0 -lt "${offset}" ]
 638                         then
 639                                 options="${options} -o ${offset}"
 640                         fi
 641
 642                         if [ -z "${encryption}" ]
 643                         then
 644                                 losetup ${options} "${dev}" "${fspath}"
 645                         else
 646                                 # Loop AES encryption
 647                                 while true
 648                                 do
 649                                         load_keymap
 650
 651                                         echo -n "Enter passphrase for root filesystem: " >&6
 652                                         read -s passphrase
 653                                         echo "${passphrase}" > /tmp/passphrase
 654                                         unset passphrase
 655                                         exec 9</tmp/passphrase
 656                                         /sbin/losetup ${options} -e "${encryption}" -p 9 "${dev}" "${fspath}"
 657                                         error=${?}
 658                                         exec 9<&-
 659                                         rm -f /tmp/passphrase
 660
 661                                         if [ 0 -eq ${error} ]
 662                                         then
 663                                                 unset error
 664                                                 break
 665                                         fi
 666
 667                                         echo
 668                                         echo -n "There was an error decrypting the root filesystem ... Retry? [Y/n] " >&6
 669                                         read answer
 670
 671                                         if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
 672                                         then
 673                                                 unset answer
 674                                                 break
 675                                         fi
 676                                 done
 677                         fi
 678
 679                         echo "${dev}"
 680                         return 0
 681                 fi
 682         done
 683
 684         panic "No loop devices available"
 685 }
 686
 687 try_mount ()
 688 {
 689         dev="${1}"
 690         mountp="${2}"
 691         opts="${3}"
 692         fstype="${4}"
 693
 694         old_mountp="$(where_is_mounted ${dev})"
 695
 696         if [ -n "${old_mountp}" ]
 697         then
 698                 if [ "${opts}" != "ro" ]
 699                 then
 700                         mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
 701                 fi
 702
 703                 mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
 704         else
 705                 if [ -z "${fstype}" ]
 706                 then
 707                         fstype=$(get_fstype "${dev}")
 708                 fi
 709                 mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || \
 710                 ( echo "SKIPPING: Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}" > live-boot.log && return 0 )
 711         fi
 712 }
 713
 714 open_luks_device ()
 715 {
 716         dev="${1}"
 717         name="$(basename ${dev})"
 718         opts="--key-file=-"
 719         if [ -n "${PERSISTENT_READONLY}" ]
 720         then
 721                 opts="${opts} --readonly"
 722         fi
 723
 724         if /sbin/cryptsetup status "${name}" >/dev/null 2>&1
 725         then
 726                 re="^[[:space:]]*device:[[:space:]]*\([^[:space:]]*\)$"
 727                 opened_dev=$(cryptsetup status ${name} 2>/dev/null | grep "${re}" | sed "s|${re}|\1|")
 728                 if [ "${opened_dev}" = "${dev}" ]
 729                 then
 730                         luks_device="/dev/mapper/${name}"
 731                         echo ${luks_device}
 732                         return 0
 733                 else
 734                         log_warning_msg "Cannot open luks device ${dev} since ${opened_dev} already is opened with its name"
 735                         return 1
 736                 fi
 737         fi
 738
 739         load_keymap
 740
 741         while true
 742         do
 743                 /lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | \
 744                         /sbin/cryptsetup -T 1 luksOpen ${dev} ${name} ${opts}
 745
 746                 if [ 0 -eq ${?} ]
 747                 then
 748                         luks_device="/dev/mapper/${name}"
 749                         echo ${luks_device}
 750                         return 0
 751                 fi
 752
 753                 echo >&6
 754                 echo -n "There was an error decrypting ${dev} ... Retry? [Y/n] " >&6
 755                 read answer
 756
 757                 if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
 758                 then
 759                         return 2
 760                 fi
 761         done
 762 }
 763
 764 get_gpt_name ()
 765 {
 766     local dev="${1}"
 767     /sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
 768 }
 769
 770 is_gpt_device ()
 771 {
 772     local dev="${1}"
 773     [ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
 774 }
 775
 776 probe_for_gpt_name ()
 777 {
 778         local overlays="${1}"
 779         local snapshots="${2}"
 780         local dev="${3}"
 781
 782         if ! is_gpt_device ${dev} || \
 783            ( echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<luks\>" && \
 784              /sbin/cryptsetup isLuks ${dev} > /dev/null 2>&1 )
 785         then
 786                 return
 787         fi
 788         for label in ${overlays} ${snapshots}
 789         do
 790                 if [ "$(get_gpt_name ${dev})" = "${label}" ]
 791                 then
 792                         echo "${label}=${dev}"
 793                 fi
 794         done
 795 }
 796
 797 probe_for_fs_label ()
 798 {
 799         local overlays="${1}"
 800         local snapshots="${2}"
 801         local dev="${3}"
 802
 803         for label in ${overlays} ${snapshots}
 804         do
 805                 if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
 806                 then
 807                         echo "${label}=${dev}"
 808                 fi
 809         done
 810 }
 811
 812 probe_for_file_name ()
 813 {
 814         local overlays="${1}"
 815         local snapshots="${2}"
 816         local dev="${3}"
 817
 818         local devfstype="$(get_fstype ${dev})"
 819         local backing="${rootmnt}/live/persistent/$(basename ${dev})"
 820         local ret=""
 821         if is_supported_fs ${devfstype} && mkdir -p "${backing}" && \
 822            try_mount "${dev}" "${backing}" "rw" "${devfstype}"
 823         then
 824                 for label in ${overlays}
 825                 do
 826                         path=${backing}/${PERSISTENT_PATH}${label}
 827                         if [ -f "${path}" ]
 828                         then
 829                                 local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
 830                                 ret="${ret} ${label}=${loopdev}"
 831                         fi
 832                 done
 833                 for label in ${snapshots}
 834                 do
 835                         for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
 836                         do
 837                                 path="${PERSISTENT_PATH}${label}.${ext}"
 838                                 if [ -f "${backing}/${path}" ]
 839                                 then
 840                                         ret="${ret} ${label}=${dev}:${backing}:${path}"
 841                                 fi
 842                         done
 843                 done
 844
 845                 if [ -n "${ret}" ]
 846                 then
 847                         echo ${ret}
 848                 else
 849                         umount ${backing} > /dev/null 2>&1 || true
 850                 fi
 851         fi
 852 }
 853
 854 find_persistent_media ()
 855 {
 856         # Scans devices for overlays and snapshots, and returns a whitespace
 857         # separated list of how to use them. Only overlays with a partition
 858         # label or file name in ${overlays} are returned, and ditto for
 859         # snapshots with labels in ${snapshots}.
 860         #
 861         # When scanning a LUKS device, the user will be asked to enter the
 862         # passphrase; on failure to enter it, or if no persistent partitions
 863         # or files were found, the LUKS device is closed.
 864         #
 865         # For a snapshot file the return value is ${label}=${snapdata}", where
 866         # ${snapdata} is the parameter used for try_snap().
 867         #
 868         # For all other cases (overlay/snapshot partition and overlay file) the
 869         # return value is "${label}=${device}", where ${device} a device that
 870         # can mount the content. In the case of an overlay file, the device
 871         # containing the file will remain mounted as a side-effect.
 872         #
 873         # No devices in ${black_listed_devices} will be scanned, and if
 874         # ${white_list_devices} is non-empty, only devices in it will be
 875         # scanned.
 876
 877         local overlays="${1}"
 878         local snapshots="${2}"
 879         local white_listed_devices="${3}"
 880         local ret=""
 881
 882         for dev in $(storage_devices "" "${white_listed_devices}")
 883         do
 884                 local result=""
 885
 886                 local real_dev=""
 887                 local luks_device=""
 888                 # Check if it's a luks device; we'll have to open the device
 889                 # in order to probe any filesystem it contains, like we do
 890                 # below. do_custom_mounts() also depends on that any luks
 891                 # device already has been opened.
 892                 if echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
 893                    /sbin/cryptsetup isLuks ${dev} >/dev/null 2>&1
 894                 then
 895                         if luks_device=$(open_luks_device "${dev}")
 896                         then
 897                                 real_dev="${dev}"
 898                                 dev="${luks_device}"
 899                         else
 900                                 # skip $dev since we failed/chose not to open it
 901                                 continue
 902                         fi
 903                 elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
 904                 then
 905                         # skip $dev since we don't allow unencrypted storage
 906                         continue
 907                 fi
 908
 909                 # Probe for matching GPT partition names or filesystem labels
 910                 if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
 911                 then
 912                         local gpt_dev="${dev}"
 913                         if [ -n "${luks_device}" ]
 914                         then
 915                                 # When we probe GPT partitions we need to look
 916                                 # at the real device, not the virtual, opened
 917                                 # luks device
 918                                 gpt_dev="${real_dev}"
 919                         fi
 920                         result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${gpt_dev})
 921                         if [ -n "${result}" ]
 922                         then
 923                                 ret="${ret} ${result}"
 924                                 continue
 925                         fi
 926
 927                         result=$(probe_for_fs_label "${overlays}" "${snapshots}" ${dev})
 928                         if [ -n "${result}" ]
 929                         then
 930                                 ret="${ret} ${result}"
 931                                 continue
 932                         fi
 933                 fi
 934
 935                 # Probe for files with matching name on mounted partition
 936                 if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
 937                 then
 938                         result=$(probe_for_file_name "${overlays}" "${snapshots}" ${dev})
 939                         if [ -n "${result}" ]
 940                         then
 941                                 ret="${ret} ${result}"
 942                                 continue
 943                         fi
 944                 fi
 945
 946                 # Close luks device if it isn't used
 947                 if [ -z "${result}" ] && [ -n "${luks_device}" ] && \
 948                    /sbin/cryptsetup status "${luks_device}" 1> /dev/null 2>&1
 949                 then
 950                         /sbin/cryptsetup luksClose "${luks_device}"
 951                 fi
 952         done
 953
 954         if [ -n "${ret}" ]
 955         then
 956                 echo ${ret}
 957         fi
 958 }
 959
 960 get_mac ()
 961 {
 962         mac=""
 963
 964         for adaptor in /sys/class/net/*
 965         do
 966                 status="$(cat ${adaptor}/iflink)"
 967
 968                 if [ "${status}" -eq 2 ]
 969                 then
 970                         mac="$(cat ${adaptor}/address)"
 971                         mac="$(echo ${mac} | sed 's/:/-/g' | tr '[a-z]' '[A-Z]')"
 972                 fi
 973         done
 974
 975         echo ${mac}
 976 }
 977
 978 is_luks()
 979 {
 980     devname="${1}"
 981     if [ -x /sbin/cryptsetup ]
 982     then
 983         /sbin/cryptsetup isLuks "${devname}" 2>/dev/null || ret=${?}
 984         return ${ret}
 985     else
 986         return 1
 987     fi
 988
 989 }
 990
 991 removable_dev ()
 992 {
 993         output_format="${1}"
 994         want_usb="${2}"
 995         ret=
 996
 997         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
 998         do
 999                 dev_ok=
1000                 if [ "$(cat ${sysblock}/removable)" = "1" ]
1001                 then
1002                         if [ -z "${want_usb}" ]
1003                         then
1004                                 dev_ok="yes"
1005                         else
1006                                 if readlink ${sysblock} | grep -q usb
1007                                 then
1008                                         dev_ok="yes"
1009                                 fi
1010                         fi
1011                 fi
1012
1013                 if [ "${dev_ok}" = "yes" ]
1014                 then
1015                         case "${output_format}" in
1016                                 sys)
1017                                         ret="${ret} ${sysblock}"
1018                                         ;;
1019                                 *)
1020                                         devname=$(sys2dev "${sysblock}")
1021                                         ret="${ret} ${devname}"
1022                                         ;;
1023                         esac
1024                 fi
1025         done
1026
1027         echo "${ret}"
1028 }
1029
1030 removable_usb_dev ()
1031 {
1032         output_format="${1}"
1033
1034         removable_dev "${output_format}" "want_usb"
1035 }
1036
1037 non_removable_dev ()
1038 {
1039         output_format="${1}"
1040         ret=
1041
1042         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
1043         do
1044                 if [ "$(cat ${sysblock}/removable)" = "0" ]
1045                 then
1046                         case "${output_format}" in
1047                                 sys)
1048                                         ret="${ret} ${sysblock}"
1049                                         ;;
1050                                 *)
1051                                         devname=$(sys2dev "${sysblock}")
1052                                         ret="${ret} ${devname}"
1053                                         ;;
1054                         esac
1055                 fi
1056         done
1057
1058         echo "${ret}"
1059 }
1060
1061 link_files ()
1062 {
1063         # create source's directory structure in dest, and recursively
1064         # create symlinks in dest to to all files in source. if mask
1065         # is non-empty, remove mask from all source paths when
1066         # creating links (will be necessary if we change root, which
1067         # live-boot normally does (into $rootmnt)).
1068
1069         # remove multiple /:s and ensure ending on /
1070         local src_dir="$(echo "${1}"/ | sed -e 's|/\+|/|g')"
1071         local dest_dir="$(echo "${2}"/ | sed -e 's|/\+|/|g')"
1072         local src_mask="${3}"
1073
1074         # This check can only trigger on the inital, non-recursive call since
1075         # we create the destination before recursive calls
1076         if [ ! -d "${dest_dir}" ];
1077         then
1078                 log_warning_msg "Must link_files into a directory"
1079                 return
1080         fi
1081
1082         find "${src_dir}" -mindepth 1 -maxdepth 1 | while read x; do
1083                 local src="${x}"
1084                 local dest="${dest_dir}$(basename "${x}")"
1085                 if [ -d "${src}" ];
1086                 then
1087                         if [ -z "$(ls -A "${src}")" ];
1088                         then
1089                                 continue
1090                         fi
1091                         if [ ! -d "${dest}" ];
1092                         then
1093                                 mkdir -p "${dest}"
1094                                 prev="$(dirname "${dest}")"
1095                                 chown --reference "${prev}" "${dest}"
1096                                 chmod --reference "${prev}" "${dest}"
1097                         fi
1098                         link_files "${src}" "${dest}" "${src_mask}"
1099                 else
1100                         if [ -n "${src_mask}" ]
1101                         then
1102                                 src="$(echo ${src} | sed "s|^${src_mask}||")"
1103                         fi
1104                         rm -rf "${dest}" 2> /dev/null
1105                         ln -s "${src}" "${dest}"
1106                 fi
1107         done
1108 }
1109
1110 do_union ()
1111 {
1112         local unionmountpoint="${1}"    # directory where the union is mounted
1113         local unionrw="${2}"            # branch where the union changes are stored
1114         local unionro1="${3}"           # first underlying read-only branch (optional)
1115         local unionro2="${4}"           # second underlying read-only branch (optional)
1116
1117         if [ "${UNIONTYPE}" = "aufs" ]
1118         then
1119                 rw_opt="rw"
1120                 ro_opt="rr+wh"
1121                 noxino_opt="noxino"
1122         elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
1123         then
1124                 rw_opt="RW"
1125                 ro_opt="RO"
1126         else
1127                 rw_opt="rw"
1128                 ro_opt="ro"
1129         fi
1130
1131         case "${UNIONTYPE}" in
1132                 unionfs-fuse)
1133                         unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
1134                         unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
1135                         if [ -n "${unionro1}" ]
1136                         then
1137                                 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
1138                         fi
1139                         if [ -n "${unionro2}" ]
1140                         then
1141                                 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
1142                         fi
1143                         ( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
1144                         unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
1145                         ( mkdir -p /run/sendsigs.omit.d
1146                         pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
1147                         ;;
1148
1149                 overlayfs)
1150                         # XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
1151                         # XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
1152                         unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
1153                         mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
1154                         ;;
1155
1156                 *)
1157                         unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
1158                         if [ -n "${unionro1}" ]
1159                         then
1160                                 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
1161                         fi
1162                         if [ -n "${unionro2}" ]
1163                         then
1164                                 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
1165                         fi
1166                         mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
1167                         ;;
1168         esac
1169 }
1170
1171 get_custom_mounts ()
1172 {
1173         # Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistent
1174         # Side-effect: prints info to file $custom_mounts
1175
1176         local devices="${1}"
1177         local custom_mounts="${2}" # print result to this file
1178         local rootmnt="${3}"       # should be set empty post-live-boot
1179
1180         local bindings="/bindings.list"
1181         local links="/links.list"
1182         rm -rf ${bindings} ${links} 2> /dev/null
1183         local persistent_backing="${rootmnt}/live/persistent"
1184
1185         for device in ${devices}
1186         do
1187                 if [ ! -b "${device}" ]
1188                 then
1189                         continue
1190                 fi
1191
1192                 local device_name="$(basename ${device})"
1193                 local device_used=""
1194                 # $device may already have been mounted by
1195                 # probe_for_file_name() in find_persistent_media() ...
1196                 local backing=$(where_is_mounted ${device})
1197                 if [ -z "${backing}" ]
1198                 then
1199                         # ... otherwise we mount it now
1200                         backing="${persistent_backing}/${device_name}"
1201                         mkdir -p "${backing}"
1202                         local device_fstype="$(get_fstype ${device})"
1203                         if [ -z "${PERSISTENT_READONLY}" ]
1204                         then
1205                                 device_mount_opts="rw,noatime"
1206                         else
1207                                 device_mount_opts="ro,noatime"
1208                         fi
1209                         if ! mount -t "${device_fstype}" -o "${device_mount_opts}" "${device}" "${backing}" >/dev/null 2>&1
1210                         then
1211                                 log_warning_msg "Could not mount persistent media ${device} (${device_fstype})"
1212                         fi
1213                 fi
1214                 local include_list="${backing}/${persistence_list}"
1215                 if [ ! -r "${include_list}" ]
1216                 then
1217                         umount "${backing}" >/dev/null 2>&1
1218                         rmdir "${backing}" >/dev/null 2>&1
1219                         if /sbin/cryptsetup status ${device_name} >/dev/null 2>&1
1220                         then
1221                                 /sbin/cryptsetup luksClose "${device_name}"
1222                         fi
1223                         continue
1224                 fi
1225
1226                 [ "${DEBUG}" = "Yes" ] && cp ${include_list} ${persistent_backing}/${persistence_list}.${device_name}
1227                 while read source dest options # < ${include_list}
1228                 do
1229                         if echo ${source} | grep -qe "^[[:space:]]*\(#.*\)\?$"
1230                         then
1231                                 # skipping empty or commented lines
1232                                 continue
1233                         fi
1234
1235                         if echo ${dest} | grep -qe "^[^/]"
1236                         then
1237                                 options="${dest}"
1238                                 dest="${source}"
1239                         elif [ -z "${dest}" ]
1240                         then
1241                                 dest="${source}"
1242                         fi
1243
1244                         if echo ${dest} | grep -qe "^/\+$\|^/\+live\(/.*\)\?$"
1245                         then
1246                                 # mounting on / or /live could cause trouble
1247                                 log_warning_msg "Skipping unsafe custom mount on ${dest}"
1248                                 continue
1249                         fi
1250
1251                         for opt in $(echo ${options} | tr ',' ' ');
1252                         do
1253                                 case "${opt}" in
1254                                         linkfiles|union)
1255                                                 ;;
1256                                         *)
1257                                                 log_warning_msg "Skipping custom mount with unkown option: ${opt}"
1258                                                 continue 2
1259                                                 ;;
1260                                 esac
1261                         done
1262
1263                         # FIXME: handle case: we already have /a/b in
1264                         # $bindings added from current $device, but
1265                         # now we find /a -- /a should replace /a/b in
1266                         # $bindings.
1267
1268                         # FIXME: handle case: we have /a in $bindings
1269                         # from current $device, now we find /a/b, so
1270                         # we skip /a/b
1271
1272                         # ensure that no multiple-/ occur in paths
1273                         local full_source="$(echo ${backing}/${source}/ | sed -e 's|/\+|/|g')"
1274                         local full_dest="$(echo ${rootmnt}/${dest}/ | sed -e 's|/\+|/|g')"
1275                         device_used="yes"
1276                         if echo ${options} | grep -qe "\<linkfiles\>";
1277                         then
1278                                 echo "${full_source} ${full_dest} ${options}" >> ${links}
1279                         else
1280                                 echo "${full_source} ${full_dest} ${options}" >> ${bindings}
1281                         fi
1282                 done < ${include_list}
1283
1284                 if [ -z "${device_used}" ]
1285                 then
1286                         # this device was not used for / earlier, or
1287                         # custom mount point now, so it's useless
1288                         umount "${backing}"
1289                         rmdir "${backing}"
1290                 fi
1291         done
1292
1293         # We sort the list according to destination so we're sure that
1294         # we won't hide a previous mount. We also ignore duplicate
1295         # destinations in a more or less arbitrary way.
1296         [ -e "${bindings}" ] && sort -k2 -sbu ${bindings} >> ${custom_mounts} && rm ${bindings}
1297
1298         # After all mounts are considered we add symlinks so they
1299         # won't be hidden by some mount.
1300         [ -e "${links}" ] && sort -k2 -sbu ${links} >> ${custom_mounts} && rm ${links}
1301 }
1302
1303 do_custom_mounts ()
1304 {
1305         local custom_mounts="${1}" # the ouput from get_custom_mounts()
1306         local rootmnt="${2}"       # should be set empty post-live-boot
1307
1308         while read source dest options # < ${custom_mounts}
1309         do
1310                 local opt_linkfiles=""
1311                 local opt_union=""
1312                 for opt in $(echo ${options} | tr ',' ' ');
1313                 do
1314                          case "${opt}" in
1315                                 linkfiles)
1316                                         opt_linkfiles="yes"
1317                                         ;;
1318                                 union)
1319                                         opt_union="yes"
1320                                         ;;
1321                         esac
1322                 done
1323
1324                 if mountpoint -q "${dest}";
1325                 then
1326                         log_warning_msg "Skipping custom mount ${source} on ${dest}: destination is already a mount point"
1327                         continue
1328                 fi
1329
1330                 # FIXME: we don't handle already existing
1331                 # non-directory files in the paths of both $source and
1332                 # $dest.
1333
1334                 if [ ! -d "${dest}" ]
1335                 then
1336                         # if ${dest} is in /home/$user, try fixing
1337                         # proper ownership
1338                         # FIXME: this should really be handled by
1339                         # live-config since we don't know for sure
1340                         # which uid a certain user has until then
1341                         if echo ${dest} | grep -qe "^${rootmnt}/*home/\+[^/]\+"
1342                         then
1343                                 path="/"
1344                                 for dir in $(echo ${dest} | sed -e 's|/\+| |g')
1345                                 do
1346                                         path=${path}/${dir}
1347                                         if [ ! -e ${path} ]
1348                                         then
1349                                                 mkdir -p ${path}
1350                                                 # assume that the intended user is the first, which is usually the case
1351                                                 chown 1000:1000 ${path}
1352                                         fi
1353                                 done
1354                         else
1355                                 mkdir -p ${dest}
1356                         fi
1357                 fi
1358
1359                 # if ${source} doesn't exist on our persistent media
1360                 # we bootstrap it with $dest from the live filesystem.
1361                 # this both makes sense and is critical if we're
1362                 # dealing with /etc or other system dir.
1363                 if [ ! -d "${source}" ]
1364                 then
1365                         if [ -n "${PERSISTENT_READONLY}" ] || [ -n "${opt_linkfiles}" ]
1366                         then
1367                                 continue
1368                         elif [ -n "${opt_union}" ]
1369                         then
1370                                 # union's don't need to be bootstrapped
1371                                 mkdir "${source}"
1372                         else
1373                                 # ensure that $dest is not copied *into* $source
1374                                 mkdir -p "$(dirname ${source})"
1375                                 cp -a "${dest}" "${source}"
1376                         fi
1377                 fi
1378
1379                 rofs_dest_backing=""
1380                 for d in ${rootmnt}/live/rofs/*
1381                 do
1382                         if [ -n "${rootmnt}" ]
1383                         then
1384                                 rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
1385                         else
1386                                 rofs_dest_backing="${d}/${dest}"
1387
1388                         fi
1389                         if [ -d "${rofs_dest_backing}" ]
1390                         then
1391                                 break
1392                         else
1393                                 rofs_dest_backing=""
1394                         fi
1395                 done
1396
1397                 if [ -z "${PERSISTENT_READONLY}" ]
1398                 then
1399                         if [ -n "${opt_linkfiles}" ]
1400                         then
1401                                 links_source="${source}"
1402                                 links_dest="${dest}"
1403                         elif [ -n "${opt_union}" ]
1404                         then
1405                                 do_union ${dest} ${source} ${rofs_dest_backing}
1406                         else
1407                                 mount --bind "${source}" "${dest}"
1408                         fi
1409                 else
1410                         if [ -n "${opt_linkfiles}" ]
1411                         then
1412                                 links_dest="${dest}"
1413                                 dest="$(mktemp -d ${persistent_backing}/links_source-XXXXXX)"
1414                                 links_source="${dest}"
1415                         fi
1416                         if [ -n "${rootmnt}" ]
1417                         then
1418                                 cow_dir="$(echo ${dest} | sed -e "s|${rootmnt}|/cow/|")"
1419                         else
1420                                 cow_dir="/live/cow/${dest}"
1421                         fi
1422                         mkdir -p ${cow_dir}
1423                         do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
1424                 fi
1425
1426                 if [ -n "${opt_linkfiles}" ]
1427                 then
1428                         link_files "${links_source}" "${links_dest}" "${rootmnt}"
1429                 fi
1430
1431                 PERSISTENCE_IS_ON="1"
1432                 export PERSISTENCE_IS_ON
1433         done < ${custom_mounts}
1434 }
1435
1436 fix_home_rw_compatibility ()
1437 {
1438         local device=${1}
1439
1440         if [ -n "${PERSISTENT_READONLY}" ]
1441         then
1442                 return
1443         fi
1444
1445         local backing="$(where_is_mounted ${device})"
1446         if [ -z "${backing}" ]
1447         then
1448                 backing="${rootmnt}/live/persistent/$(basename ${device})"
1449                 mkdir -p "${backing}"
1450                 local device_fstype="$(get_fstype ${device})"
1451         local device_mount_opts="rw,noatime"
1452         if ! mount -t "${device_fstype}" -o "${device_mount_opts}" "${device}" "${backing}" >/dev/null 2>&1
1453         then
1454                 return
1455         fi
1456
1457         local include_list="${backing}/${persistence_list}"
1458         if [ ! -r "${include_list}" ]
1459         then
1460                 echo "# home-rw backwards compatibility:
1461 . /home" > "${include_list}"
1462         fi
1463 }