iankelling.org Git - automated-distro-installer/blob - fai/config/hooks/partition.DEFAULT

   1 #!/bin/bash -x
   2 # Copyright (C) 2016 Ian Kelling
   3
   4 # This program is free software; you can redistribute it and/or
   5 # modify it under the terms of the GNU General Public License
   6 # as published by the Free Software Foundation; either version 2
   7 # of the License, or (at your option) any later version.
   8
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17
  18 PS4='+ $LINENO '
  19 set -eE -o pipefail
  20 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  21
  22 if [[ $EUID != 0 ]]; then
  23   echo "$0: error: need to run as root" >&2
  24   exit 1
  25 fi
  26
  27 # for calling outside of FAI:
  28 # fai-redep
  29 # s
  30 # source /b/fai/fai-wrapper
  31 # - set any appropriate classes with: fai-setclass OPT1... which sets CLASS_OPT1=true...
  32 #   or run eval-fai-classfile FILE
  33 # export luks_dir=/q/root/luks
  34 #
  35 # OPTIONS:
  36 #
  37 # environment variables:
  38 #
  39 # HOSTNAME: if frodo, we exclude 2 devices from the /boot array, which
  40 # the bios does not see. if demohost, we set the luks password to just
  41 # 'x'.
  42 #
  43 # SPECIAL_DISK: For use outside of fai. A base disk name like
  44 # /dev/sdk. If set, we just cryptsetup and partition this one disk then
  45 # exit. This is useful for partitioning a disk in preparation to replace
  46 # a failed or failing disk from a raid10 array.
  47 #
  48 # classes:
  49 #
  50 # REPARTITION: forces repartitioning even if we detect the proper amount
  51 # of partitions already exist.
  52 #
  53 # NOWIPE: use existing subvolumes if they exist
  54 #
  55 # ROTATIONAL: forces to install onto hdds instead of sdds. normally sdds
  56 # are chosen if they exist.
  57 #
  58 # PARTITION_PROMPT: command line prompt before partitioning
  59 #
  60 # RAID0: forces raid0 filesystem. Normally with 4+ devices, we use
  61 # raid10.
  62 # RAID1: forces raid1 filesystem.
  63
  64 if [[ $SPECIAL_DISK ]]; then
  65   export CLASS_REPARTITION=true
  66 fi
  67
  68 # # fai's setup-storage won't do btrfs on luks,
  69 # # so we do it ourself :)
  70 # inspiration taken from files in fai-setup-storage package
  71
  72 # if we are not running in fai, skiptask won't be defined, so carry on.
  73 skiptask partition || ! type skiptask
  74
  75 if ! type -p devbyid; then
  76   for d in $FAI/distro-install-common \
  77              /a/bin/fai/fai/config/distro-install-common $FAI $PWD; do
  78     [[ -d $d ]] || continue
  79     if [[ -e $d/devbyid ]]; then
  80       devbyid=$d/devbyid
  81       devbyid() { $devbyid "$@"; }
  82       break
  83     fi
  84   done
  85   if [[ ! $devbyid ]]; then
  86     echo "$0: error: failed to find devbyid script" >&2
  87     exit 1
  88   fi
  89 fi
  90
  91
  92
  93 #### begin configuration
  94
  95 rootn=1
  96 swapn=2
  97 bootn=3
  98 # ext partition so grub can write persistent variables,
  99 # so it can do a one time boot. grub can't write to
 100 # btrfs or any cow fs because it's more
 101 # more complicated to do and they don't want to.
 102 grub_extn=4
 103 # bios boot partition,
 104 # https://wiki.archlinux.org/index.php/GRUB
 105 bios_grubn=5
 106 lastn=$bios_grubn
 107
 108
 109
 110 ##### end configuration
 111
 112
 113 add-part() { # add partition suffix to $dev
 114   local d ret
 115   if [[ $# == 1 ]]; then
 116     d=$dev
 117     part=$1
 118   else
 119     d=$1
 120     part=$2
 121   fi
 122   if [[ $d == /dev/disk/by-id/* ]]; then
 123     ret=$d-part$part
 124   else
 125     ret=$d$part
 126   fi
 127   echo $ret
 128 }
 129
 130 bootdev() { add-part $@ $bootn; }
 131 rootdev() { add-part $@ $rootn; }
 132 swapdev() { add-part $@ $swapn; }
 133 grub_extdev() { add-part $@ $grub_extn; }
 134 bios_grubdev() { add-part $@ $bios_grubn; }
 135
 136 crypt-dev() { echo /dev/mapper/crypt_dev_${1##*/}; }
 137 crypt-name() { echo crypt_dev_${1##*/}; }
 138 root-cryptdev() { crypt-dev $(rootdev $@); }
 139 swap-cryptdev() { crypt-dev $(swapdev $@); }
 140 root-cryptname() { crypt-name $(rootdev $@); }
 141 swap-cryptname() { crypt-name $(swapdev $@); }
 142
 143 ##### end function defs
 144
 145 if ifclass REPARTITION; then
 146   partition=true # force a full wipe
 147 else
 148   partition=false # change to true to force a full wipe
 149 fi
 150 if ifclass NOWIPE; then
 151   wipe=false
 152 else
 153   wipe=true
 154 fi
 155
 156 if ((`nproc` > 2)); then
 157   mopts=,compress=zstd
 158 fi
 159
 160 declare -A disk_excludes
 161 if ! ifclass USE_MOUNTED; then
 162   ## ignore disks that are mounted, eg when running from fai-cd
 163   while read -r l; do
 164     eval "$l"
 165     if [[ ! $PKNAME ]]; then
 166       PKNAME="$KNAME"
 167     fi
 168     if [[ $MOUNTPOINT ]]; then
 169       disk_excludes[$PKNAME]=true
 170     fi
 171   done < <(lsblk -nP -o KNAME,MOUNTPOINT,PKNAME)
 172 fi
 173
 174 hdds=()
 175 ssds=()
 176 cd /sys/block
 177 for disk in [sv]d[a-z]; do
 178   if [[ ${disk_excludes[$disk]} ]]; then
 179     continue
 180   fi
 181   case $(cat $disk/queue/rotational) in
 182     0) ssds+=(/dev/$disk) ;;
 183     1) hdds+=(/dev/$disk) ;;
 184     *) echo "$0: error: unknown /sys/block/$disk/queue/rotational: \
 185 $(cat $disk/queue/rotational)"; exit 1 ;;
 186   esac
 187 done
 188
 189 # install all ssds, or if there are none, all hdds.
 190 # Note, usb flash disks are seen as rotational, which is
 191 # very odd, but convenient for ignoring them here.
 192 # TODO: find a reliable way to ignore them.
 193 if ! ifclass ROTATIONAL && (( ${#ssds[@]} > 0 )); then
 194   short_devs=( ${ssds[@]} )
 195 else
 196   short_devs=( ${hdds[@]} )
 197 fi
 198
 199 # check if the partitions exist have the right filesystems
 200 #blkid="$(blkid -s TYPE)"
 201 for dev in ${short_devs[@]}; do
 202   if $partition; then break; fi
 203   y=$(readlink -f $dev)
 204   arr=($y[0-9])
 205   [[ ${#arr[@]}  == "$lastn" ]] || partition=true
 206   for (( i=1; i <= lastn; i++ )); do
 207     [[ -e ${dev}$i ]] || partition=true
 208   done
 209   # On one system, blkid is missing some partitions.
 210   # maybe we need a flag, like FUZZY_BLKID or something, so we
 211   # can check that at least some exist.
 212   # for x in "`rootdev`: TYPE=\"crypto_LUKS\"" "`bootdev`: TYPE=\"btrfs\""; do
 213   #     echo "$blkid" | grep -Fx "$x" &>/dev/null || partition=true
 214   # done
 215 done
 216
 217 if $partition && ifclass PARTITION_PROMPT; then
 218   echo "Press any key except ctrl-c to continue and partition these drives:"
 219   echo "  ${short_devs[*]}"
 220   read -r
 221 fi
 222
 223 devs=()
 224 shopt -s extglob
 225 for short_dev in ${short_devs[@]}; do
 226   devs+=($(devbyid $short_dev))
 227 done
 228 if [[ ! ${devs[0]} ]]; then
 229   echo "$0: error: failed to detect devs" >&2
 230   exit 1
 231 fi
 232
 233 boot_space=0
 234 first=false
 235 boot_devs=()
 236 for dev in ${devs[@]}; do
 237   if ifclass frodo; then
 238     # I ran into a machine where the bios doesn't know about some disks,
 239     # so 1st stage of grub also doesn't know about them.
 240     # Also, grub does not support mounting degraded btrfs as far as
 241     # I can tell with some googling.
 242     # From within an arch install env, I could detect them by noting
 243     # their partitions were mixed with the next disk in /dev/disk/by-path,
 244     # and I have mixed model disks, and I could see the 8 models which showed
 245     # up in the bios, and thus see which 2 models were missing.
 246     # hdparm -I /dev/sdh will give model info in linux.
 247     # However, in fai on jessie, /dev/disk/by-path dir doesn't exist,
 248     # and I don't see another way, so I'm hardcoding them.
 249     # We still put grub on them and partition them the same, for uniformity
 250     # and in case they get moved to a system that can recognize them,
 251     # we just exclude them from the boot filesystem.
 252     cd /dev/disk/by-id/
 253     bad_disk=false
 254     for id in ata-TOSHIBA_MD04ACA500_8539K4TQFS9A \
 255                 ata-TOSHIBA_MD04ACA500_Y5IFK6IJFS9A; do
 256       if [[ $(readlink -f $id) == "$(readlink -f $dev)" ]]; then
 257         bad_disk=true
 258         break
 259       fi
 260     done
 261     $bad_disk || boot_devs+=($(bootdev))
 262   else
 263     boot_space=$(( boot_space + $(parted -m $dev unit MiB print | \
 264                                     sed -nr "s#^/dev/[^:]+:([0-9]+).*#\1#p") - 1))
 265     boot_devs+=($(bootdev))
 266   fi
 267   if [[ $boot_devs && $first ]]; then
 268     first_grub_extdev=$(grub_extdev)
 269     first=false
 270   fi
 271 done
 272
 273 if ifclass RAID0 || (( ${#boot_devs[@]} == 1 )); then
 274   raid_level=0
 275 elif ifclass RAID1 || (( ${#boot_devs[@]} <= 3 )); then
 276   raid_level=1
 277 else
 278   raid_level=10
 279 fi
 280
 281 ### Begin calculate boot partition space
 282 # due to raid duplication
 283 case $raid_level in
 284   1*) boot_space=$(( boot_space / 2 )) ;;
 285 esac
 286 if (( boot_space > 60000 )); then
 287   # this is larger than needed for several /boot subvols,
 288   # becuase I keep a minimal debian install on it for
 289   # recovery needs and for doing pxe-kexec.
 290   boot_mib=10000
 291 elif (( boot_space > 30000 )); then
 292   boot_mib=$(( 5000 + (boot_space - 30000) / 2 ))
 293 else
 294   # Small vms don't have room for /boot recovery.  With 3 kernels
 295   # installed, i'm using 132M on t8, so this seems like plenty of
 296   # room. note: rhel 8 recomments 1g for /boot.
 297   boot_mib=500
 298   #
 299 fi
 300 case $raid_level in
 301   1*) boot_mib=$(( boot_mib * 2 )) ;;
 302 esac
 303 ### end calculate boot partition space
 304
 305
 306
 307 if [[ ! $DISTRO ]]; then
 308   if ifclass VOL_BUSTER_BOOTSTRAP; then
 309     DISTRO=debianbuster_bootstrap
 310   elif ifclass VOL_STRETCH; then
 311     DISTRO=debianstretch
 312   elif ifclass VOL_BUSTER; then
 313     DISTRO=debianbuster
 314   elif ifclass VOL_BULLSEYE; then
 315     DISTRO=debianbullseye
 316   elif ifclass VOL_TESTING; then
 317     DISTRO=debiantesting
 318   elif ifclass VOL_XENIAL; then
 319     DISTRO=ubuntuxenial
 320   elif ifclass VOL_BIONIC; then
 321     DISTRO=ubuntubionic
 322   elif ifclass VOL_FOCAL; then
 323     DISTRO=ubuntufocal
 324   elif ifclass VOL_FLIDAS; then
 325     DISTRO=trisquelflidas
 326   elif ifclass VOL_ETIONA; then
 327     DISTRO=trisqueletiona
 328   elif ifclass VOL_NABIA; then
 329     DISTRO=trisquelnabia
 330   else
 331     echo "PARTITIONER ERROR: no distro class/var set" >&2
 332     exit 1
 333   fi
 334 fi
 335 first_boot_dev=${boot_devs[0]}
 336
 337
 338 bpart() { # btrfs a partition
 339   case $raid_level in
 340     0) mkfs.btrfs -f $@ ;;
 341     1) mkfs.btrfs -f -m raid1 -d raid1 $@ ;;
 342     10) mkfs.btrfs -f -m raid10 -d raid10 $@ ;;
 343   esac
 344 }
 345
 346
 347 if [[ ! $luks_dir ]]; then
 348   # see README for docs about how to create these
 349   luks_dir=$FAI/distro-install-common/luks
 350 fi
 351
 352 luks_file=$luks_dir/host-$HOSTNAME
 353 if [[ ! -e $luks_file ]]; then
 354   hostkeys=($luks_dir/host-*)
 355   # if there is only one key, we might be deploying somewhere
 356   # where dhcp doesnt give us a proper hostname, so use that.
 357   if [[ ${#hostkeys[@]} == 1 && -e ${hostkeys[0]} ]]; then
 358     luks_file=${hostkeys[0]}
 359   else
 360     echo "$0: error: no key for hostname at $luks_file" >&2
 361     exit 1
 362   fi
 363 fi
 364
 365 # # note, corresponding changes in /b/ds/keyscript-{on,off}
 366 if ifclass demohost; then
 367   lukspw=x
 368 elif [[ -e $luks_dir/$HOSTNAME ]]; then
 369   lukspw=$(cat $luks_dir/$HOSTNAME)
 370 else
 371   lukspw=$(cat $luks_dir/iank)
 372 fi
 373
 374
 375 first_root_crypt=$(root-cryptdev ${devs[0]})
 376
 377 # 1.5 x based on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-disk-partitioning-setup-x86.html#sect-custom-partitioning-x86
 378 swap_mib=$(( $(grep ^MemTotal: /proc/meminfo | \
 379                  awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1024 ))
 380
 381 mkdir -p /tmp/fai
 382 root_devs=()
 383 for dev in ${devs[@]}; do
 384   root_devs+=($(rootdev))
 385 done
 386 shopt -s nullglob
 387 if $partition; then
 388
 389   ### begin wipefs
 390   if [[ ! $SPECIAL_DISK ]]; then
 391     for dev in ${devs[@]}; do
 392       # if we repartition to the same as an old partition,
 393       # we don't want any old fses hanging around.
 394       for (( i=1; i <= lastn; i++ )); do
 395         x=$(add-part $dev $i)
 396         [[ -e $x ]] || continue
 397         count_down=10
 398         # wipefs has failed, manual run works, google suggests timing issue
 399         while ! wipefs -a $x; do
 400           sleep 2
 401           count_down=$((count_down - 1))
 402           (( count_down > 0 )) || exit 1
 403         done
 404       done
 405     done
 406   fi
 407   ### end wipefs
 408
 409   for dev in ${devs[@]}; do
 410     if [[ $SPECIAL_DISK ]]; then
 411       dev=$(devbyid $SPECIAL_DISK)
 412     fi
 413
 414     # parted will round up the disk size. Do -1 so we can have
 415     # fully 1MiB unit partitions for easy resizing of the last partition.
 416     # Otherwise we would pass in -0 for the end argument for the last partition.
 417     #
 418     # Note: parted print error output is expected. example:
 419     # Error: /dev/vda: unrecognised disk label
 420     disk_mib=$(( $(parted -m $dev unit MiB print | \
 421                      sed -nr "s#^/dev/[^:]+:([0-9]+).*#\1#p") - 1))
 422     root_end=$(( disk_mib - swap_mib - boot_mib /  ${#boot_devs[@]} ))
 423     swap_end=$(( root_end + swap_mib))
 424
 425     parted -s $dev mklabel gpt
 426     # MiB because parted complains about alignment otherwise.
 427     pcmd="parted -a optimal -s -- $dev"
 428     $pcmd mkpart primary ext3 12MiB ${root_end}MiB
 429     # without naming, systemd gives us misc errors like:
 430     # dev-disk-by\x2dpartlabel-primary.device: Dev dev-disk-by\x2dpartlabel-primary.device appeared twice
 431     $pcmd name $rootn root
 432     # normally a swap is type "linux-swap", but this is encrypted swap. using that
 433     # label will confuse systemd.
 434     $pcmd mkpart primary "" ${root_end}MiB ${swap_end}MiB
 435     $pcmd name $swapn swap
 436     $pcmd mkpart primary "" ${swap_end}MiB ${disk_mib}MiB
 437     $pcmd name $bootn boot
 438     # i only need a few k, but googling min size,
 439     # I found someone saying that gparted required
 440     # required at least 8 because of their hard drive cylinder size.
 441     # And 8 is still very tiny.
 442     $pcmd mkpart primary "ext2" 4MiB 12MiB
 443     $pcmd name $grub_extn grubext
 444     # gpt ubuntu cloud image uses ~4 mb for this partition. fai uses 1 MiB.
 445     # so, I use 3, whatever.
 446     # note: parted manual saying cheap flash media
 447     # should to start at 4.
 448     $pcmd mkpart primary "" 1MiB 4MiB
 449     $pcmd name $bios_grubn biosgrub
 450     $pcmd set $bios_grubn bios_grub on
 451     $pcmd set $bootn boot on # generally not needed on modern systems
 452     # the mkfs failed before on a vm, which prompted me to add
 453     # sleep .1
 454     # then it failed again on a physical machine
 455     # with:
 456     # Device /dev/disk/by-id/foo doesn't exist or access denied,
 457     # so I added a wait until it existed.
 458     # Then I added the mkfs.ext2, which claimed to succeed,
 459     # but then couldn't be found upon reboot. In that case we didn't
 460     # wait at all. So I've added a 3 second minimum wait.
 461     sleep 3
 462     secs=0
 463     while [[ ! -e $(rootdev) ]] && (( secs < 10 )); do
 464       sleep 1
 465       secs=$((secs +1))
 466     done
 467     # Holds just a single file, rarely written, so
 468     # use ext2, like was often used for the /boot partition.
 469     # This exists because grub can only persist data to a non-cow fs.
 470     # And we use persisting a var in grub to do a one time boot.
 471     # We could pass the data on the kernel command line and persist it
 472     # to grubenv after booting, but that relies on the boot always succeeding.
 473     # This is just a bit more robust, and it could work for booting
 474     # into ipxe which can't persist data, if we ever got that working.
 475     mkfs.ext2 $(grub_extdev)
 476     # when we move to newer than trisquel 9, we can remove
 477     # --type luks1. We can also check on cryptsetup --help | less /compil
 478     # to see about the other settings. Default in debian 9 is luks2.
 479     # You can convert from luks2 to luks 1 by adding a temporary key:
 480     # cryptsetup luksAddKey --pbkdf pbkdf2
 481     # then remove the new format keys with cryptsetup luksRemoveKey
 482     # then cryptsetup convert DEV --type luks1, then readd old keys and remove temp.
 483     yes YES | cryptsetup luksFormat $(rootdev) $luks_file \
 484                          --type luks1 -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 485     yes "$lukspw" | \
 486       cryptsetup luksAddKey --key-file $luks_file \
 487                  $(rootdev) || [[ $? == 141 ]]
 488     # background: Keyfile and password are treated just
 489     # like 2 ways to input a passphrase, so we don't actually need to have
 490     # different contents of keyfile and passphrase, but it makes some
 491     # security sense to a really big randomly generated passphrase
 492     # as much as possible, so we have both.
 493     #
 494     # This would remove the keyfile.
 495     #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 496       #                            /key/file || [[ $? == 141 ]]
 497
 498     cryptsetup luksOpen $(rootdev) $(root-cryptname) \
 499                --key-file $luks_file
 500
 501     if [[ $SPECIAL_DISK ]]; then
 502       exit 0
 503     fi
 504   done
 505   ls -la /dev/btrfs-control # this was probably for debugging...
 506   sleep 1
 507   bpart $(for dev in ${devs[@]}; do root-cryptdev; done)
 508   bpart ${boot_devs[@]}
 509 else
 510   for dev in ${devs[@]}; do
 511     if [[ -e /dev/mapper/$(root-cryptname) ]]; then
 512       continue
 513     fi
 514     cryptsetup luksOpen $(rootdev) $(root-cryptname) \
 515                --key-file $luks_file
 516   done
 517   sleep 1
 518 fi
 519
 520
 521 if $wipe && [[ $DISTRO != debianbuster_bootstrap ]]; then
 522   # bootstrap distro doesn't use separate encrypted root.
 523   mount -o subvolid=0 $first_root_crypt /mnt
 524   # systemd creates subvolumes we want to delete.
 525   s=($(btrfs subvolume list --sort=-path /mnt |
 526          sed -rn "s#^.*path\s*(root_$DISTRO/\S+)\s*\$#\1#p"))
 527   for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 528   btrfs subvolume set-default 0 /mnt
 529   [[ ! -e /mnt/root_$DISTRO ]] || btrfs subvolume delete /mnt/root_$DISTRO
 530
 531   ## create subvols ##
 532   cd /mnt
 533
 534   btrfs subvolume create root_$DISTRO
 535
 536   # could set default subvol like this, but no reason to.
 537   # btrfs subvolume set-default \
 538     #       $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
 539
 540   # no cow on the root filesystem. it's setup is fully scripted,
 541   # if it's messed up, we will just recreated it,
 542   # and we can get better perf with this.
 543   # I can't remember exactly why, but this is preferable to mounting with
 544   # -o nodatacow, I think because subvolumes inherit that.
 545   chattr -Rf +C root_$DISTRO
 546   cd /
 547   umount /mnt
 548 fi
 549
 550 mount -o subvolid=0 $first_boot_dev /mnt
 551 cd /mnt
 552 btrfs subvolume set-default 0 /mnt # already default, just ensuring it.
 553
 554 # for libreboot systems. grub2 only reads from subvolid=0
 555 mkdir -p /mnt/grub2
 556 cp $FAI/distro-install-common/libreboot_grub.cfg /mnt/grub2
 557
 558 if [[ $DISTRO == debianbuster_bootstrap ]]; then
 559   # this is just convenience for the libreboot_grub config
 560   # so we can glob the other ones easier.
 561   boot_vol=$DISTRO
 562 else
 563   boot_vol=boot_$DISTRO
 564 fi
 565 if $wipe && [[ -e /mnt/$boot_vol ]]; then
 566   btrfs subvolume delete /mnt/$boot_vol
 567 fi
 568 if [[ ! -e /mnt/$boot_vol ]]; then
 569   btrfs subvolume create $boot_vol
 570 fi
 571 cd /
 572 umount /mnt
 573 ## end create subvols ##
 574
 575 dev=${boot_devs[0]}
 576 mount $first_grub_extdev /mnt
 577 grub-editenv /mnt/grubenv set did_fai_check=true
 578 grub-editenv /mnt/grubenv set last_boot=/$boot_vol
 579 umount /mnt
 580
 581 if [[ $DISTRO == debianbuster_bootstrap ]]; then
 582   cat > /tmp/fai/fstab <<EOF
 583 $first_boot_dev  /  btrfs  noatime,subvol=$boot_vol  0 0
 584 EOF
 585   cat >/tmp/fai/disk_var.sh <<EOF
 586 BOOT_DEVICE="${short_devs[@]}"
 587 ROOT_PARTITION=$first_boot_dev
 588 EOF
 589 else
 590   # note, fai creates the mountpoints listed here
 591   cat > /tmp/fai/fstab <<EOF
 592 $first_root_crypt  /  btrfs          noatime,subvol=root_$DISTRO$mopts  0 0
 593 $first_root_crypt  /mnt/root  btrfs  nofail,noatime,subvolid=0$mopts  0 0
 594 $first_boot_dev  /boot  btrfs        nofail,noatime,subvol=$boot_vol  0 0
 595 $first_boot_dev  /mnt/boot  btrfs    nofail,noatime,subvolid=0  0 0
 596 EOF
 597   swaps=()
 598   rm -f /tmp/fai/crypttab
 599   for dev in ${devs[@]}; do
 600     swaps+=($(swap-cryptname))
 601     cat >>/tmp/fai/crypttab <<EOF
 602 $(root-cryptname) $(rootdev)  none  keyscript=/root/keyscript,discard,luks,initramfs
 603 $(swap-cryptname) $(swapdev)  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 604 EOF
 605     cat >> /tmp/fai/fstab <<EOF
 606 $(swap-cryptdev)  none  swap  nofail,sw  0 0
 607 EOF
 608   done
 609
 610   # fai would do this:
 611   #BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 612
 613   # note: swaplist seems to do nothing.
 614   cat >/tmp/fai/disk_var.sh <<EOF
 615 BOOT_DEVICE="${short_devs[@]}"
 616 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 617 # ROOT_PARTITIONS is added by me, used in arch setup.
 618 ROOT_PARTITIONS="${root_devs[@]}"
 619 ROOT_PARTITION=\${ROOT_PARTITION:-$first_root_crypt}
 620 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 621 EOF
 622 fi