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         # return first found
 518         grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
 519 }
 520
 521 trim_path () {
 522     # remove all unnecessary /:s in the path, including last one (except
 523     # if path is just "/")
 524     echo ${1} | sed 's|//\+|/|g' | sed 's|^\(.*[^/]\)/$|\1|'
 525 }
 526
 527 what_is_mounted_on ()
 528 {
 529         local dir="$(trim_path ${1})"
 530         grep -m1 "^[^ ]\+ ${dir} " /proc/mounts | cut -d' ' -f1
 531 }
 532
 533 chown_ref ()
 534 {
 535         local reference="${1}"
 536         shift
 537         local targets=${@}
 538         local owner=$(stat -c %u:%g "${reference}")
 539         chown -h ${owner} ${targets}
 540 }
 541
 542 chmod_ref ()
 543 {
 544         local reference="${1}"
 545         shift
 546         local targets=${@}
 547         local rights=$(stat -c %a "${reference}")
 548         chmod ${rights} ${targets}
 549 }
 550
 551 lastline ()
 552 {
 553         while read lines
 554         do
 555                 line=${lines}
 556         done
 557
 558         echo "${line}"
 559 }
 560
 561 base_path ()
 562 {
 563         testpath="${1}"
 564         mounts="$(awk '{print $2}' /proc/mounts)"
 565         testpath="$(busybox realpath ${testpath})"
 566
 567         while true
 568         do
 569                 if echo "${mounts}" | grep -qs "^${testpath}"
 570                 then
 571                         set -- $(echo "${mounts}" | grep "^${testpath}" | lastline)
 572                         echo ${1}
 573                         break
 574                 else
 575                         testpath=$(dirname $testpath)
 576                 fi
 577         done
 578 }
 579
 580 fs_size ()
 581 {
 582         # Returns used/free fs kbytes + 5% more
 583         # You could pass a block device as ${1} or the mount point as ${2}
 584
 585         dev="${1}"
 586         mountp="${2}"
 587         used="${3}"
 588
 589         if [ -z "${mountp}" ]
 590         then
 591                 mountp="$(where_is_mounted ${dev})"
 592
 593                 if [ -z "${mountp}" ]
 594                 then
 595                         mountp="/mnt/tmp_fs_size"
 596
 597                         mkdir -p "${mountp}"
 598                         mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
 599
 600                         doumount=1
 601                 fi
 602         fi
 603
 604         if [ "${used}" = "used" ]
 605         then
 606                 size=$(du -ks ${mountp} | cut -f1)
 607                 size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
 608         else
 609                 # free space
 610                 size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
 611         fi
 612
 613         if [ -n "${doumount}" ]
 614         then
 615                 umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
 616                 rmdir "${mountp}"
 617         fi
 618
 619         echo "${size}"
 620 }
 621
 622 load_keymap ()
 623 {
 624         # Load custom keymap
 625         if [ -x /bin/loadkeys -a -r /etc/boottime.kmap.gz ]
 626         then
 627                 loadkeys /etc/boottime.kmap.gz
 628         fi
 629 }
 630
 631 setup_loop ()
 632 {
 633         local fspath=${1}
 634         local module=${2}
 635         local pattern=${3}
 636         local offset=${4}
 637         local encryption=${5}
 638         local readonly=${6}
 639
 640         # the output of setup_loop is evaluated in other functions,
 641         # modprobe leaks kernel options like "libata.dma=0"
 642         # as "options libata dma=0" on stdout, causing serious
 643         # problems therefor, so instead always avoid output to stdout
 644         modprobe -q -b "${module}" 1>/dev/null
 645
 646         udevadm settle
 647
 648         for loopdev in ${pattern}
 649         do
 650                 if [ "$(cat ${loopdev}/size)" -eq 0 ]
 651                 then
 652                         dev=$(sys2dev "${loopdev}")
 653                         options=''
 654
 655                         if [ -n "${readonly}" ]
 656                         then
 657                                 if losetup --help 2>&1 | grep -q -- "-r\b"
 658                                 then
 659                                         options="${options} -r"
 660                                 fi
 661                         fi
 662
 663                         if [ -n "${offset}" ] && [ 0 -lt "${offset}" ]
 664                         then
 665                                 options="${options} -o ${offset}"
 666                         fi
 667
 668                         if [ -z "${encryption}" ]
 669                         then
 670                                 losetup ${options} "${dev}" "${fspath}"
 671                         else
 672                                 # Loop AES encryption
 673                                 while true
 674                                 do
 675                                         load_keymap
 676
 677                                         echo -n "Enter passphrase for root filesystem: " >&6
 678                                         read -s passphrase
 679                                         echo "${passphrase}" > /tmp/passphrase
 680                                         unset passphrase
 681                                         exec 9</tmp/passphrase
 682                                         /sbin/losetup ${options} -e "${encryption}" -p 9 "${dev}" "${fspath}"
 683                                         error=${?}
 684                                         exec 9<&-
 685                                         rm -f /tmp/passphrase
 686
 687                                         if [ 0 -eq ${error} ]
 688                                         then
 689                                                 unset error
 690                                                 break
 691                                         fi
 692
 693                                         echo
 694                                         echo -n "There was an error decrypting the root filesystem ... Retry? [Y/n] " >&6
 695                                         read answer
 696
 697                                         if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
 698                                         then
 699                                                 unset answer
 700                                                 break
 701                                         fi
 702                                 done
 703                         fi
 704
 705                         echo "${dev}"
 706                         return 0
 707                 fi
 708         done
 709
 710         panic "No loop devices available"
 711 }
 712
 713 try_mount ()
 714 {
 715         dev="${1}"
 716         mountp="${2}"
 717         opts="${3}"
 718         fstype="${4}"
 719
 720         old_mountp="$(where_is_mounted ${dev})"
 721
 722         if [ -n "${old_mountp}" ]
 723         then
 724                 if [ "${opts}" != "ro" ]
 725                 then
 726                         mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
 727                 fi
 728
 729                 mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
 730         else
 731                 if [ -z "${fstype}" ]
 732                 then
 733                         fstype=$(get_fstype "${dev}")
 734                 fi
 735                 mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || \
 736                 ( echo "SKIPPING: Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}" > live-boot.log && return 0 )
 737         fi
 738 }
 739
 740 mount_persistent_media ()
 741 {
 742         local device=${1}
 743         local backing=""
 744
 745         # We can't mount into ${rootmnt}/live before ${rootmnt} has been
 746         # mounted since that would cover our mountpoint.
 747         if [ -n "${rootmnt}" ] && [ -z "$(what_is_mounted_on ${rootmnt})" ]
 748         then
 749                 backing="/$(basename ${device})-backing"
 750         else
 751                 backing="${rootmnt}/live/persistent/$(basename ${device})"
 752         fi
 753
 754         mkdir -p "${backing}"
 755         local old_backing="$(where_is_mounted ${device})"
 756         if [ -z "${old_backing}" ]
 757         then
 758                 local fstype="$(get_fstype ${device})"
 759                 local mount_opts="rw,noatime"
 760                 if [ -n "${PERSISTENT_READONLY}" ]
 761                 then
 762                         mount_opts="ro,noatime"
 763                 fi
 764                 if mount -t "${fstype}" -o "${mount_opts}" "${device}" "${backing}" >/dev/null
 765                 then
 766                         echo ${backing}
 767                         return 0
 768                 else
 769                         log_warning_msg "Failed to mount persistent media ${device}"
 770                         return 1
 771                 fi
 772         elif [ "${backing}" != "${old_backing}" ]
 773         then
 774                 if mount --move ${old_backing} ${backing} >/dev/null
 775                 then
 776                         echo ${backing}
 777                         return 0
 778                 else
 779                         log_warning_msg "Failed to move persistent media ${device}"
 780                         return 1
 781                 fi
 782         fi
 783         return 0
 784 }
 785
 786 close_persistent_media () {
 787         local device=${1}
 788         local backing="$(where_is_mounted ${device})"
 789
 790         if [ -d "${backing}" ]
 791         then
 792                 umount "${backing}" >/dev/null 2>&1
 793                 rmdir "${backing}" >/dev/null 2>&1
 794         fi
 795
 796         if is_active_luks_mapping ${device}
 797         then
 798                 /sbin/cryptsetup luksClose ${device}
 799         fi
 800 }
 801
 802 open_luks_device ()
 803 {
 804         dev="${1}"
 805         name="$(basename ${dev})"
 806         opts="--key-file=-"
 807         if [ -n "${PERSISTENT_READONLY}" ]
 808         then
 809                 opts="${opts} --readonly"
 810         fi
 811
 812         if /sbin/cryptsetup status "${name}" >/dev/null 2>&1
 813         then
 814                 re="^[[:space:]]*device:[[:space:]]*\([^[:space:]]*\)$"
 815                 opened_dev=$(cryptsetup status ${name} 2>/dev/null | grep "${re}" | sed "s|${re}|\1|")
 816                 if [ "${opened_dev}" = "${dev}" ]
 817                 then
 818                         luks_device="/dev/mapper/${name}"
 819                         echo ${luks_device}
 820                         return 0
 821                 else
 822                         log_warning_msg "Cannot open luks device ${dev} since ${opened_dev} already is opened with its name"
 823                         return 1
 824                 fi
 825         fi
 826
 827         load_keymap
 828
 829         while true
 830         do
 831                 /lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | \
 832                         /sbin/cryptsetup -T 1 luksOpen ${dev} ${name} ${opts}
 833
 834                 if [ 0 -eq ${?} ]
 835                 then
 836                         luks_device="/dev/mapper/${name}"
 837                         echo ${luks_device}
 838                         return 0
 839                 fi
 840
 841                 echo >&6
 842                 echo -n "There was an error decrypting ${dev} ... Retry? [Y/n] " >&6
 843                 read answer
 844
 845                 if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
 846                 then
 847                         return 2
 848                 fi
 849         done
 850 }
 851
 852 get_gpt_name ()
 853 {
 854     local dev="${1}"
 855     /sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
 856 }
 857
 858 is_gpt_device ()
 859 {
 860     local dev="${1}"
 861     [ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
 862 }
 863
 864 probe_for_gpt_name ()
 865 {
 866         local overlays="${1}"
 867         local snapshots="${2}"
 868         local dev="${3}"
 869
 870         local gpt_dev="${dev}"
 871         if is_active_luks_mapping ${dev}
 872         then
 873                 # if $dev is an opened luks device, we need to check
 874                 # GPT stuff on the backing device
 875                 gpt_dev=$(get_luks_backing_device "${dev}")
 876         fi
 877
 878         if ! is_gpt_device ${gpt_dev}
 879         then
 880                 return
 881         fi
 882
 883         local gpt_name=$(get_gpt_name ${gpt_dev})
 884         for label in ${overlays} ${snapshots}
 885         do
 886                 if [ "${gpt_name}" = "${label}" ]
 887                 then
 888                         echo "${label}=${dev}"
 889                 fi
 890         done
 891 }
 892
 893 probe_for_fs_label ()
 894 {
 895         local overlays="${1}"
 896         local snapshots="${2}"
 897         local dev="${3}"
 898
 899         for label in ${overlays} ${snapshots}
 900         do
 901                 if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
 902                 then
 903                         echo "${label}=${dev}"
 904                 fi
 905         done
 906 }
 907
 908 probe_for_file_name ()
 909 {
 910         local overlays="${1}"
 911         local snapshots="${2}"
 912         local dev="${3}"
 913
 914         local ret=""
 915         local backing="$(mount_persistent_media ${dev})"
 916         if [ -z "${backing}" ]
 917         then
 918             return
 919         fi
 920
 921         for label in ${overlays}
 922         do
 923                 path=${backing}/${PERSISTENT_PATH}${label}
 924                 if [ -f "${path}" ]
 925                 then
 926                         local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
 927                         ret="${ret} ${label}=${loopdev}"
 928                 fi
 929         done
 930         for label in ${snapshots}
 931         do
 932                 for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
 933                 do
 934                         path="${PERSISTENT_PATH}${label}.${ext}"
 935                         if [ -f "${backing}/${path}" ]
 936                         then
 937                                 ret="${ret} ${label}=${dev}:${backing}:${path}"
 938                         fi
 939                 done
 940         done
 941
 942         if [ -n "${ret}" ]
 943         then
 944                 echo ${ret}
 945         else
 946                 umount ${backing} > /dev/null 2>&1 || true
 947         fi
 948 }
 949
 950 find_persistent_media ()
 951 {
 952         # Scans devices for overlays and snapshots, and returns a whitespace
 953         # separated list of how to use them. Only overlays with a partition
 954         # label or file name in ${overlays} are returned, and ditto for
 955         # snapshots with labels in ${snapshots}.
 956         #
 957         # When scanning a LUKS device, the user will be asked to enter the
 958         # passphrase; on failure to enter it, or if no persistent partitions
 959         # or files were found, the LUKS device is closed.
 960         #
 961         # For a snapshot file the return value is ${label}=${snapdata}", where
 962         # ${snapdata} is the parameter used for try_snap().
 963         #
 964         # For all other cases (overlay/snapshot partition and overlay file) the
 965         # return value is "${label}=${device}", where ${device} a device that
 966         # can mount the content. In the case of an overlay file, the device
 967         # containing the file will remain mounted as a side-effect.
 968         #
 969         # No devices in ${black_listed_devices} will be scanned, and if
 970         # ${white_list_devices} is non-empty, only devices in it will be
 971         # scanned.
 972
 973         local overlays="${1}"
 974         local snapshots="${2}"
 975         local white_listed_devices="${3}"
 976         local ret=""
 977
 978         for dev in $(storage_devices "" "${white_listed_devices}")
 979         do
 980                 local result=""
 981
 982                 local luks_device=""
 983                 # Check if it's a luks device; we'll have to open the device
 984                 # in order to probe any filesystem it contains, like we do
 985                 # below. activate_custom_mounts() also depends on that any luks
 986                 # device already has been opened.
 987                 if echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
 988                    is_luks_partition ${dev}
 989                 then
 990                         if luks_device=$(open_luks_device "${dev}")
 991                         then
 992                                 dev="${luks_device}"
 993                         else
 994                                 # skip $dev since we failed/chose not to open it
 995                                 continue
 996                         fi
 997                 elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
 998                 then
 999                         # skip $dev since we don't allow unencrypted storage
1000                         continue
1001                 fi
1002
1003                 # Probe for matching GPT partition names or filesystem labels
1004                 if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
1005                 then
1006                         result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${dev})
1007                         if [ -n "${result}" ]
1008                         then
1009                                 ret="${ret} ${result}"
1010                                 continue
1011                         fi
1012
1013                         result=$(probe_for_fs_label "${overlays}" "${snapshots}" ${dev})
1014                         if [ -n "${result}" ]
1015                         then
1016                                 ret="${ret} ${result}"
1017                                 continue
1018                         fi
1019                 fi
1020
1021                 # Probe for files with matching name on mounted partition
1022                 if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
1023                 then
1024                         result=$(probe_for_file_name "${overlays}" "${snapshots}" ${dev})
1025                         if [ -n "${result}" ]
1026                         then
1027                                 ret="${ret} ${result}"
1028                                 continue
1029                         fi
1030                 fi
1031
1032                 # Close luks device if it isn't used
1033                 if [ -z "${result}" ] && [ -n "${luks_device}" ] && \
1034                    is_active_luks_mapping "${luks_device}"
1035                 then
1036                         /sbin/cryptsetup luksClose "${luks_device}"
1037                 fi
1038         done
1039
1040         if [ -n "${ret}" ]
1041         then
1042                 echo ${ret}
1043         fi
1044 }
1045
1046 get_mac ()
1047 {
1048         mac=""
1049
1050         for adaptor in /sys/class/net/*
1051         do
1052                 status="$(cat ${adaptor}/iflink)"
1053
1054                 if [ "${status}" -eq 2 ]
1055                 then
1056                         mac="$(cat ${adaptor}/address)"
1057                         mac="$(echo ${mac} | sed 's/:/-/g' | tr '[a-z]' '[A-Z]')"
1058                 fi
1059         done
1060
1061         echo ${mac}
1062 }
1063
1064 is_luks_partition ()
1065 {
1066         device="${1}"
1067         /sbin/cryptsetup isLuks "${device}" 1>/dev/null 2>&1
1068 }
1069
1070 is_active_luks_mapping ()
1071 {
1072         device="${1}"
1073         /sbin/cryptsetup status "${device}" 1>/dev/null 2>&1
1074 }
1075
1076 get_luks_backing_device () {
1077         device=${1}
1078         cryptsetup status ${device} 2> /dev/null | \
1079                 awk '{if ($1 == "device:") print $2}'
1080 }
1081
1082 removable_dev ()
1083 {
1084         output_format="${1}"
1085         want_usb="${2}"
1086         ret=
1087
1088         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
1089         do
1090                 dev_ok=
1091                 if [ "$(cat ${sysblock}/removable)" = "1" ]
1092                 then
1093                         if [ -z "${want_usb}" ]
1094                         then
1095                                 dev_ok="yes"
1096                         else
1097                                 if readlink ${sysblock} | grep -q usb
1098                                 then
1099                                         dev_ok="yes"
1100                                 fi
1101                         fi
1102                 fi
1103
1104                 if [ "${dev_ok}" = "yes" ]
1105                 then
1106                         case "${output_format}" in
1107                                 sys)
1108                                         ret="${ret} ${sysblock}"
1109                                         ;;
1110                                 *)
1111                                         devname=$(sys2dev "${sysblock}")
1112                                         ret="${ret} ${devname}"
1113                                         ;;
1114                         esac
1115                 fi
1116         done
1117
1118         echo "${ret}"
1119 }
1120
1121 removable_usb_dev ()
1122 {
1123         output_format="${1}"
1124
1125         removable_dev "${output_format}" "want_usb"
1126 }
1127
1128 non_removable_dev ()
1129 {
1130         output_format="${1}"
1131         ret=
1132
1133         for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
1134         do
1135                 if [ "$(cat ${sysblock}/removable)" = "0" ]
1136                 then
1137                         case "${output_format}" in
1138                                 sys)
1139                                         ret="${ret} ${sysblock}"
1140                                         ;;
1141                                 *)
1142                                         devname=$(sys2dev "${sysblock}")
1143                                         ret="${ret} ${devname}"
1144                                         ;;
1145                         esac
1146                 fi
1147         done
1148
1149         echo "${ret}"
1150 }
1151
1152 link_files ()
1153 {
1154         # create source's directory structure in dest, and recursively
1155         # create symlinks in dest to to all files in source. if mask
1156         # is non-empty, remove mask from all source paths when
1157         # creating links (will be necessary if we change root, which
1158         # live-boot normally does (into $rootmnt)).
1159
1160         # remove multiple /:s and ensure ending on /
1161         local src_dir="$(echo "${1}"/ | sed -e 's|/\+|/|g')"
1162         local dest_dir="$(echo "${2}"/ | sed -e 's|/\+|/|g')"
1163         local src_mask="${3}"
1164
1165         # This check can only trigger on the inital, non-recursive call since
1166         # we create the destination before recursive calls
1167         if [ ! -d "${dest_dir}" ]
1168         then
1169                 log_warning_msg "Must link_files into a directory"
1170                 return
1171         fi
1172
1173         find "${src_dir}" -mindepth 1 -maxdepth 1 | while read src; do
1174                 local dest="${dest_dir}$(basename "${src}")"
1175                 if [ -d "${src}" ]
1176                 then
1177                         if [ -z "$(ls -A "${src}")" ]
1178                         then
1179                                 continue
1180                         fi
1181                         if [ ! -d "${dest}" ]
1182                         then
1183                                 mkdir -p "${dest}"
1184                                 prev="$(dirname "${dest}")"
1185                                 chown_ref "${prev}" "${dest}"
1186                                 chmod_ref "${prev}" "${dest}"
1187                         fi
1188                         link_files "${src}" "${dest}" "${src_mask}"
1189                 else
1190                         if [ -n "${src_mask}" ]
1191                         then
1192                                 src="$(echo ${src} | sed "s|^${src_mask}||")"
1193                         fi
1194                         rm -rf "${dest}" 2> /dev/null
1195                         ln -s "${src}" "${dest}"
1196                 fi
1197         done
1198 }
1199
1200 do_union ()
1201 {
1202         local unionmountpoint="${1}"    # directory where the union is mounted
1203         local unionrw="${2}"            # branch where the union changes are stored
1204         local unionro1="${3}"           # first underlying read-only branch (optional)
1205         local unionro2="${4}"           # second underlying read-only branch (optional)
1206
1207         if [ "${UNIONTYPE}" = "aufs" ]
1208         then
1209                 rw_opt="rw"
1210                 ro_opt="rr+wh"
1211                 noxino_opt="noxino"
1212         elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
1213         then
1214                 rw_opt="RW"
1215                 ro_opt="RO"
1216         else
1217                 rw_opt="rw"
1218                 ro_opt="ro"
1219         fi
1220
1221         case "${UNIONTYPE}" in
1222                 unionfs-fuse)
1223                         unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
1224                         unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
1225                         if [ -n "${unionro1}" ]
1226                         then
1227                                 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
1228                         fi
1229                         if [ -n "${unionro2}" ]
1230                         then
1231                                 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
1232                         fi
1233                         ( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
1234                         unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
1235                         ( mkdir -p /run/sendsigs.omit.d
1236                         pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
1237                         ;;
1238
1239                 overlayfs)
1240                         # XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
1241                         # XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
1242                         unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
1243                         mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
1244                         ;;
1245
1246                 *)
1247                         unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
1248                         if [ -n "${unionro1}" ]
1249                         then
1250                                 unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
1251                         fi
1252                         if [ -n "${unionro2}" ]
1253                         then
1254                                 unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
1255                         fi
1256                         mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
1257                         ;;
1258         esac
1259 }
1260
1261 get_custom_mounts ()
1262 {
1263         # Side-effect: leaves $devices with live.persist mounted in ${rootmnt}/live/persistent
1264         # Side-effect: prints info to file $custom_mounts
1265
1266         local custom_mounts=${1}
1267         shift
1268         local devices=${@}
1269
1270         local bindings="/tmp/bindings.list"
1271         local links="/tmp/links.list"
1272         rm -rf ${bindings} ${links} 2> /dev/null
1273
1274         for device in ${devices}
1275         do
1276                 if [ ! -b "${device}" ]
1277                 then
1278                         continue
1279                 fi
1280
1281                 local device_name="$(basename ${device})"
1282                 local backing=$(mount_persistent_media ${device})
1283                 if [ -z "${backing}" ]
1284                 then
1285                         continue
1286                 fi
1287
1288                 local include_list="${backing}/${persistence_list}"
1289                 if [ ! -r "${include_list}" ]
1290                 then
1291                         continue
1292                 fi
1293
1294                 if [ -n "${DEBUG}" ] && [ -e "${include_list}" ]
1295                 then
1296                         cp ${include_list} ${rootmnt}/live/persistent/${persistence_list}.${device_name}
1297                 fi
1298
1299                 while read dir options # < ${include_list}
1300                 do
1301                         if echo ${dir} | grep -qe "^[[:space:]]*\(#.*\)\?$"
1302                         then
1303                                 # skipping empty or commented lines
1304                                 continue
1305                         fi
1306
1307                         if trim_path ${dir} | grep -q -e "^[^/]" -e "^/$" -e "^/live\(/.*\)\?$" -e "^/\(.*/\)\?\.\.\?\(/.*\)\?$"
1308                         then
1309                                 log_warning_msg "Skipping unsafe custom mount ${dir}: must be an absolute path containing neither the \".\" nor \"..\" special dirs, and cannot be \"/live\" (or any sub-directory therein) or \"/\" (for the latter, use ${root_overlay_label}-type persistence)"
1310                                 continue
1311                         fi
1312
1313                         local opt_source=""
1314                         local opt_linkfiles=""
1315                         for opt in $(echo ${options} | tr ',' ' ');
1316                         do
1317                                 case "${opt}" in
1318                                         source=*)
1319                                                 opt_source=${opt#source=}
1320                                                 ;;
1321                                         linkfiles)
1322                                                 opt_linkfiles="yes"
1323                                                 ;;
1324                                         union)
1325                                                 ;;
1326                                         *)
1327                                                 log_warning_msg "Skipping custom mount with unkown option: ${opt}"
1328                                                 continue 2
1329                                                 ;;
1330                                 esac
1331                         done
1332
1333                         local source="${dir}"
1334                         if [ -n "${opt_source}" ]
1335                         then
1336                                 if echo ${opt_source} | grep -q -e "^/" -e "^\(.*/\)\?\.\.\?\(/.*\)\?$" && [ "${source}" != "." ]
1337                                 then
1338                                         log_warning_msg "Skipping unsafe custom mount with option source=${opt_source}: must be either \".\" (the media root) or a relative path w.r.t. the media root that contains neither comas, nor the special \".\" and \"..\" path components"
1339                                         continue
1340                                 else
1341                                         source="${opt_source}"
1342                                 fi
1343                         fi
1344
1345                         local full_source="$(trim_path ${backing}/${source})"
1346                         local full_dest="$(trim_path ${rootmnt}/${dir})"
1347                         if [ -n "${opt_linkfiles}" ]
1348                         then
1349                                 echo "${device} ${full_source} ${full_dest} ${options}" >> ${links}
1350                         else
1351                                 echo "${device} ${full_source} ${full_dest} ${options}" >> ${bindings}
1352                         fi
1353                 done < ${include_list}
1354         done
1355
1356         # We sort the list according to destination so we're sure that
1357         # we won't hide a previous mount. We also ignore duplicate
1358         # destinations in a more or less arbitrary way.
1359         [ -e "${bindings}" ] && sort -k3 -sbu ${bindings} >> ${custom_mounts} && rm ${bindings}
1360
1361         # After all mounts are considered we add symlinks so they
1362         # won't be hidden by some mount.
1363         [ -e "${links}" ] && cat ${links} >> ${custom_mounts} && rm ${links}
1364
1365         # We need to make sure that no two custom mounts have the same sources
1366         # or are nested; if that is the case, too much weird stuff can happen.
1367         local prev_source="impossible source" # first iteration must not match
1368         local prev_dest=""
1369         # This sort will ensure that a source /a comes right before a source
1370         # /a/b so we only need to look at the previous source
1371         sort -k2 -b ${custom_mounts} |
1372         while read device source dest options
1373         do
1374                 if echo ${source} | grep -qe "^${prev_source}\(/.*\)\?$"
1375                 then
1376                         panic "Two persistent mounts have the same or nested sources: ${source} on ${dest}, and ${prev_source} on ${prev_dest}"
1377                 fi
1378                 prev_source=${source}
1379                 prev_dest=${dest}
1380         done
1381 }
1382
1383 activate_custom_mounts ()
1384 {
1385         local custom_mounts="${1}" # the ouput from get_custom_mounts()
1386         local used_devices=""
1387
1388         while read device source dest options # < ${custom_mounts}
1389         do
1390                 local opt_linkfiles=""
1391                 local opt_union=""
1392                 for opt in $(echo ${options} | tr ',' ' ');
1393                 do
1394                         case "${opt}" in
1395                                 linkfiles)
1396                                         opt_linkfiles="yes"
1397                                         ;;
1398                                 union)
1399                                         opt_union="yes"
1400                                         ;;
1401                         esac
1402                 done
1403
1404                 if [ -n "${opt_linkfiles}" ] && [ -n "${opt_union}" ]
1405                 then
1406                         log_warning_msg "Skipping custom mount ${dest} with options ${options}: \"linkfiles\" and \"union\" are mutually exclusive options"
1407                 fi
1408
1409                 if [ -n "$(what_is_mounted_on "${dest}")" ]
1410                 then
1411                         log_warning_msg "Skipping custom mount ${dest}: $(what_is_mounted_on "${dest}") is already mounted there"
1412                         continue
1413                 fi
1414
1415                 if [ ! -d "${dest}" ]
1416                 then
1417                         # create the destination and delete existing files in
1418                         # its path that are in the way
1419                         path="/"
1420                         for dir in $(echo ${dest} | sed -e 's|/\+| |g')
1421                         do
1422                                 path=$(trim_path ${path}/${dir})
1423                                 if [ -f ${path} ]
1424                                 then
1425                                         rm -f ${path}
1426                                 fi
1427                                 if [ ! -e ${path} ]
1428                                 then
1429                                         mkdir -p ${path}
1430                                         if echo ${path} | grep -qe "^${rootmnt}/*home/[^/]\+"
1431                                         then
1432                                                 # if ${dest} is in /home try fixing proper ownership by assuming that the intended user is the first, which is usually the case
1433                                                 # FIXME: this should really be handled by live-config since we don't know for sure which uid a certain user has until then
1434                                                 chown 1000:1000 ${path}
1435                                         fi
1436                                 fi
1437                         done
1438                 fi
1439
1440                 # if ${source} doesn't exist on our persistent media
1441                 # we bootstrap it with $dest from the live filesystem.
1442                 # this both makes sense and is critical if we're
1443                 # dealing with /etc or other system dir.
1444                 if [ ! -d "${source}" ]
1445                 then
1446                         if [ -n "${PERSISTENT_READONLY}" ]
1447                         then
1448                                 continue
1449                         elif [ -n "${opt_union}" ] || [ -n "${opt_linkfiles}" ]
1450                         then
1451                                 # unions and don't need to be bootstrapped
1452                                 # linkfiles dirs can't be bootstrapped in a sensible way
1453                                 mkdir -p "${source}"
1454                                 chown_ref "${dest}" "${source}"
1455                                 chmod_ref "${dest}" "${source}"
1456                         else
1457                                 # ensure that $dest is not copied *into* $source
1458                                 mkdir -p "$(dirname ${source})"
1459                                 cp -a "${dest}" "${source}"
1460                         fi
1461                 fi
1462
1463                 # XXX: If CONFIG_AUFS_ROBR is added to the Debian kernel we can
1464                 # ignore the loop below and set rofs_dest_backing=$dest
1465                 rofs_dest_backing=""
1466                 for d in ${rootmnt}/live/rofs/*
1467                 do
1468                         if [ -n "${rootmnt}" ]
1469                         then
1470                                 rofs_dest_backing="${d}/$(echo ${dest} | sed -e "s|${rootmnt}||")"
1471                         else
1472                                 rofs_dest_backing="${d}/${dest}"
1473                         fi
1474                         if [ -d "${rofs_dest_backing}" ]
1475                         then
1476                                 break
1477                         else
1478                                 rofs_dest_backing=""
1479                         fi
1480                 done
1481
1482                 if [ -z "${PERSISTENT_READONLY}" ]
1483                 then
1484                         if [ -n "${opt_linkfiles}" ]
1485                         then
1486                                 links_source="${source}"
1487                                 links_dest="${dest}"
1488                         elif [ -n "${opt_union}" ]
1489                         then
1490                                 do_union ${dest} ${source} ${rofs_dest_backing}
1491                         else
1492                                 mount --bind "${source}" "${dest}"
1493                         fi
1494                 else
1495                         if [ -n "${opt_linkfiles}" ]
1496                         then
1497                                 links_dest="${dest}"
1498                                 dest="$(mktemp -d ${persistent_backing}/links_source-XXXXXX)"
1499                                 links_source="${dest}"
1500                         fi
1501                         if [ -n "${rootmnt}" ]
1502                         then
1503                                 cow_dir="$(echo ${dest} | sed -e "s|${rootmnt}|/cow/|")"
1504                         else
1505                                 cow_dir="/live/cow/${dest}"
1506                         fi
1507                         if [ -e "${cow_dir}" ]
1508                         then
1509                                 # If an earlier custom mount has files here
1510                                 # it will "block" the current mount's files
1511                                 # which is undesirable
1512                                 rm -rf "${cow_dir}"
1513                         fi
1514                         mkdir -p ${cow_dir}
1515                         chown_ref "${source}" "${cow_dir}"
1516                         chmod_ref "${source}" "${cow_dir}"
1517                         do_union ${dest} ${cow_dir} ${source} ${rofs_dest_backing}
1518                 fi
1519
1520                 if [ -n "${opt_linkfiles}" ]
1521                 then
1522                         link_files "${links_source}" "${links_dest}" "${rootmnt}"
1523                 fi
1524
1525                 PERSISTENCE_IS_ON="1"
1526                 export PERSISTENCE_IS_ON
1527
1528                 if echo ${used_devices} | grep -qve "^\(.* \)\?${device}\( .*\)\?$"
1529                 then
1530                         used_devices="${used_devices} ${device}"
1531                 fi
1532         done < ${custom_mounts}
1533
1534         echo ${used_devices}
1535 }
1536
1537 fix_home_rw_compatibility ()
1538 {
1539         local device=${1}
1540
1541         if [ -n "${PERSISTENT_READONLY}" ]
1542         then
1543                 return
1544         fi
1545
1546         local backing="$(mount_persistent_media ${device})"
1547         if [ -z "${backing}" ]
1548         then
1549                 return
1550         fi
1551
1552         local include_list="${backing}/${persistence_list}"
1553         if [ ! -r "${include_list}" ]
1554         then
1555                 echo "# home-rw backwards compatibility:
1556 /home source=." > "${include_list}"
1557         fi
1558 }