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