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