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, first
  22 # - source /a/bin/fai-wrapper
  23 # - set any appropriate classes with: fai-setclass OPT1... which sets CLASS_OPT1=true...
  24 #   or run eval-fai-classfile FILE
  25 #
  26 # OPTIONS:
  27 #
  28 # environment variables:
  29 #
  30 # HOSTNAME: if frodo, we exclude 2 devices from the /boot array, which
  31 # the bios does not see. if demohost, we set the luks password to just
  32 # 'x'.
  33 #
  34 # SPECIAL_DISK: For use outside of fai. A base disk name like
  35 # /dev/sdk. If set, we just cryptsetup and partition this one disk then
  36 # exit. This is useful for partitioning a disk in preparation to replace
  37 # a failed or failing disk from a raid10 array.
  38 #
  39 # classes:
  40 #
  41 # REPARTITION: forces repartitioning even if we detect the proper amount
  42 # of partitions already exist.
  43 #
  44 # ROTATIONAL: forces to install onto hdds instead of sdds. normally sdds
  45 # are chosen if they exist.
  46 #
  47 # PARTITION_PROMPT: command line prompt before partitioning
  48 #
  49 # RAID0: forces raid0 filesystem. Normally with 4+ devices, we use
  50 # raid10.
  51
  52 if [[ $SPECIAL_DISK ]]; then
  53   export CLASS_REPARTITION=true
  54 fi
  55
  56 # # fai's setup-storage won't do btrfs on luks,
  57 # # so we do it ourself :)
  58 # inspiration taken from files in fai-setup-storage package
  59
  60 # if we are not running in fai, skiptask won't be defined, so carry on.
  61 skiptask partition || ! type skiptask
  62
  63 if ! type -p devbyid; then
  64   for d in $FAI/distro-install-common \
  65              /a/bin/fai/fai/config/distro-install-common $FAI $PWD; do
  66     [[ -d $d ]] || continue
  67     if [[ -e $d/devbyid ]]; then
  68       devbyid=$d/devbyid
  69       devbyid() { $devbyid "$@"; }
  70       break
  71     fi
  72   done
  73   if [[ ! $devbyid ]]; then
  74     echo "$0: error: failed to find devbyid script" >&2
  75     exit 1
  76   fi
  77 fi
  78
  79
  80
  81 #### begin configuration
  82
  83 rootn=1
  84 swapn=2
  85 bootn=3
  86 # ext partition so grub can write persistent variables,
  87 # so it can do a one time boot. grub can't write to
  88 # btrfs or any cow fs because it's more
  89 # more complicated to do and they don't want to.
  90 grub_extn=4
  91 # bios boot partition,
  92 # https://wiki.archlinux.org/index.php/GRUB
  93 bios_grubn=5
  94 lastn=$bios_grubn
  95 # this is larger than needed for several /boot subvols,
  96 # becuase I keep a minimal debian install on it, for
  97 # recovery needs, and for doing pxe-kexec.
  98 boot_mib=10000
  99
 100
 101 ##### end configuration
 102
 103
 104 add-part() { # add partition suffix to $dev
 105   local d ret
 106   if [[ $# == 1 ]]; then
 107     d=$dev
 108     part=$1
 109   else
 110     d=$1
 111     part=$2
 112   fi
 113   if [[ $d == /dev/disk/by-id/* ]]; then
 114     ret=$d-part$part
 115   else
 116     ret=$d$part
 117   fi
 118   echo $ret
 119 }
 120
 121 bootdev() { add-part $@ $bootn; }
 122 rootdev() { add-part $@ $rootn; }
 123 swapdev() { add-part $@ $swapn; }
 124 grub_extdev() { add-part $@ $grub_extn; }
 125 bios_grubdev() { add-part $@ $bios_grubn; }
 126
 127 crypt-dev() { echo /dev/mapper/crypt_dev_${1##*/}; }
 128 crypt-name() { echo crypt_dev_${1##*/}; }
 129 root-cryptdev() { crypt-dev $(rootdev $@); }
 130 swap-cryptdev() { crypt-dev $(swapdev $@); }
 131 root-cryptname() { crypt-name $(rootdev $@); }
 132 swap-cryptname() { crypt-name $(swapdev $@); }
 133
 134 ##### end function defs
 135
 136 if ifclass REPARTITION;then
 137   partition=true # force a full wipe
 138 else
 139   partition=false # change to true to force a full wipe
 140 fi
 141
 142
 143
 144 hdds=()
 145 ssds=()
 146 cd /sys/block
 147 for disk in [sv]d[a-z]; do
 148   case $(cat $disk/queue/rotational) in
 149     0) ssds+=(/dev/$disk) ;;
 150     1) hdds+=(/dev/$disk) ;;
 151     *) echo "$0: error: unknown /sys/block/$disk/queue/rotational: \
 152 $(cat $disk/queue/rotational)"; exit 1 ;;
 153   esac
 154 done
 155
 156 # install all ssds, or if there are none, all hdds.
 157 # Note, usb flash disks are seen as rotational, which is
 158 # very odd, but convenient for ignoring them here.
 159 # TODO: find a reliable way to ignore them.
 160 if ! ifclass ROTATIONAL && (( ${#ssds[@]} > 0 )); then
 161   short_devs=( ${ssds[@]} )
 162 else
 163   short_devs=( ${hdds[@]} )
 164 fi
 165
 166 # check if the partitions exist have the right filesystems
 167 #blkid="$(blkid -s TYPE)"
 168 for dev in ${short_devs[@]}; do
 169   if $partition; then break; fi
 170   y=$(readlink -f $dev)
 171   arr=($y[0-9])
 172   [[ ${#arr[@]}  == "${lastn}" ]] || partition=true
 173   for (( i=1; i <= lastn; i++ )); do
 174     [[ -e ${dev}$i ]] || partition=true
 175   done
 176   # On one system, blkid is missing some partitions.
 177   # maybe we need a flag, like FUZZY_BLKID or something, so we
 178   # can check that at least some exist.
 179   # for x in "`rootdev`: TYPE=\"crypto_LUKS\"" "`bootdev`: TYPE=\"btrfs\""; do
 180   #     echo "$blkid" | grep -Fx "$x" &>/dev/null || partition=true
 181   # done
 182 done
 183
 184 if $partition && ifclass PARTITION_PROMPT; then
 185   echo "Press any key except ctrl-c to continue and partition these drives:"
 186   echo "  ${short_devs[*]}"
 187   read -r
 188 fi
 189
 190 devs=()
 191 shopt -s extglob
 192 for short_dev in ${short_devs[@]}; do
 193   devs+=($(devbyid $short_dev))
 194 done
 195 if [[ ! ${devs[@]} ]]; then
 196   echo "$0: error: failed to detect devs" >&2
 197   exit 1
 198 fi
 199
 200
 201 first=false
 202 boot_devs=()
 203 for dev in ${devs[@]}; do
 204   if ifclass frodo; then
 205     # I ran into a machine where the bios doesn't know about some disks,
 206     # so 1st stage of grub also doesn't know about them.
 207     # Also, grub does not support mounting degraded btrfs as far as
 208     # I can tell with some googling.
 209     # From within an arch install env, I could detect them by noting
 210     # their partitions were mixed with the next disk in /dev/disk/by-path,
 211     # and I have mixed model disks, and I could see the 8 models which showed
 212     # up in the bios, and thus see which 2 models were missing.
 213     # hdparm -I /dev/sdh will give model info in linux.
 214     # However, in fai on jessie, /dev/disk/by-path dir doesn't exist,
 215     # and I don't see another way, so I'm hardcoding them.
 216     # We still put grub on them and partition them the same, for uniformity
 217     # and in case they get moved to a system that can recognize them,
 218     # we just exclude them from the boot filesystem.
 219     cd /dev/disk/by-id/
 220     bad_disk=false
 221     for id in ata-TOSHIBA_MD04ACA500_8539K4TQFS9A \
 222                 ata-TOSHIBA_MD04ACA500_Y5IFK6IJFS9A; do
 223       if [[ $(readlink -f $id) == "$(readlink -f $dev)" ]]; then
 224         bad_disk=true
 225         break
 226       fi
 227     done
 228     $bad_disk || boot_devs+=(`bootdev`)
 229   else
 230     boot_devs+=(`bootdev`)
 231   fi
 232   if [[ $boot_devs && $first ]]; then
 233     first_grub_extdev=`grub_extdev`
 234     first=false
 235   fi
 236 done
 237
 238 if ifclass RAID0 || (( ${#boot_devs[@]} < 4 )); then
 239   raid_level=0
 240 else
 241   raid_level=10
 242   # need double the space if we are raid 10, and then
 243   # might as well give some extra.
 244   boot_mib=$((boot_mib * 3))
 245 fi
 246
 247
 248
 249 if [[ ! $DISTRO ]]; then
 250   if ifclass VOL_STRETCH_BOOTSTRAP; then
 251     DISTRO=debianstretch_bootstrap
 252   elif ifclass VOL_STRETCH; then
 253     DISTRO=debianstretch
 254   elif ifclass VOL_TESTING; then
 255     DISTRO=debiantesting
 256   elif ifclass VOL_XENIAL; then
 257     DISTRO=ubuntuxenial
 258   elif ifclass VOL_BELENOS; then
 259     DISTRO=trisquelbelenos
 260   elif ifclass VOL_FLIDAS; then
 261     DISTRO=trisquelflidas
 262   else
 263     echo "PARTITIONER ERROR: no distro class/var set" >&2
 264     exit 1
 265   fi
 266 fi
 267 first_boot_dev=${boot_devs[0]}
 268
 269
 270 bpart() { # btrfs a partition
 271   case $raid_level in
 272     0) mkfs.btrfs -f $@ ;;
 273     10) mkfs.btrfs -f -m raid10 -d raid10 $@ ;;
 274   esac
 275 }
 276
 277
 278 # keyfiles generated like:
 279 # head -c 2048 /dev/urandom | od | s dd of=/q/root/luks/host-demohost
 280 luks_dir=${LUKS_DIR:-/var/lib/fai/config/distro-install-common/luks}
 281
 282 if [[ ! -e $luks_dir/host-$HOSTNAME ]]; then
 283   echo "$0: error: no key for hostname at $luks_dir/host-$HOSTNAME" >&2
 284   exit 1
 285 fi
 286
 287 lukspw=$(cat $luks_dir/iank)
 288 # # ian: disabled by chaning to tpnew while I use the tp host.
 289 # # note, corresponding changes in /b/ds/keyscript-{on,off}
 290 if ifclass tpnew; then
 291   lukspw=$(cat $luks_dir/traci)
 292 fi
 293 if ifclass demohost; then
 294   lukspw=x
 295 fi
 296
 297
 298 first_root_crypt=$(root-cryptdev ${devs[0]})
 299
 300 # 1.5 x based on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-disk-partitioning-setup-x86.html#sect-custom-partitioning-x86
 301 swap_mib=$(( $(grep ^MemTotal: /proc/meminfo | \
 302                  awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1024 ))
 303
 304 mkdir -p /tmp/fai
 305 root_devs=()
 306 for dev in ${devs[@]}; do
 307   root_devs+=(`rootdev`)
 308 done
 309 shopt -s nullglob
 310 if $partition; then
 311
 312   ### begin wipefs
 313   if [[ ! $SPECIAL_DISK ]]; then
 314     for dev in ${devs[@]}; do
 315       # if we repartition to the same as an old partition,
 316       # we don't want any old fses hanging around.
 317       for (( i=1; i <= lastn; i++ )); do
 318         x=$(add-part $dev $i)
 319         [[ -e $x ]] || continue
 320         count_down=10
 321         # wipefs has failed, manual run works, google suggests timing issue
 322         while ! wipefs -a $x; do
 323           sleep 2
 324           count_down=$((count_down - 1))
 325           (( count_down > 0 )) || exit 1
 326         done
 327       done
 328     done
 329   fi
 330   ### end wipefs
 331
 332   for dev in ${devs[@]}; do
 333     if [[ $SPECIAL_DISK ]]; then
 334       dev=$(devbyid $SPECIAL_DISK)
 335     fi
 336
 337     # parted will round up the disk size. Do -1 so we can have
 338     # fully 1MiB unit partitions for easy resizing of the last partition.
 339     # Otherwise we would pass in -0 for the end argument for the last partition.
 340     #
 341     # Note: parted print error output is expected. example:
 342     # Error: /dev/vda: unrecognised disk label
 343     disk_mib=$(( $(parted -m $dev unit MiB print | \
 344                      sed -nr "s#^/dev/[^:]+:([0-9]+).*#\1#p") - 1))
 345     root_end=$(( disk_mib - swap_mib - boot_mib /  ${#boot_devs[@]} ))
 346     swap_end=$(( root_end + swap_mib))
 347
 348     parted -s $dev mklabel gpt
 349     # MiB because parted complains about alignment otherwise.
 350     pcmd="parted -a optimal -s -- $dev"
 351     $pcmd mkpart primary ext3 12MiB ${root_end}MiB
 352     # without naming, systemd gives us misc errors like:
 353     # dev-disk-by\x2dpartlabel-primary.device: Dev dev-disk-by\x2dpartlabel-primary.device appeared twice
 354     $pcmd name $rootn root
 355     # normally a swap is type "linux-swap", but this is encrypted swap. using that
 356     # label will confuse systemd.
 357     $pcmd mkpart primary "" ${root_end}MiB ${swap_end}MiB
 358     $pcmd name $swapn swap
 359     $pcmd mkpart primary "" ${swap_end}MiB ${disk_mib}MiB
 360     $pcmd name $bootn boot
 361     # i only need a few k, but googling min size,
 362     # I found someone saying that gparted required
 363     # required at least 8 because of their hard drive cylinder size.
 364     # And 8 is still very tiny.
 365     $pcmd mkpart primary "ext2" 4MiB 12MiB
 366     $pcmd name $grub_extn grubext
 367     # gpt ubuntu cloud image uses ~4 mb for this partition. fai uses 1 MiB.
 368     # so, I use 3, whatever.
 369     # note: parted manual saying cheap flash media
 370     # should to start at 4.
 371     $pcmd mkpart primary "" 1MiB 4MiB
 372     $pcmd name $bios_grubn biosgrub
 373     $pcmd set $bios_grubn bios_grub on
 374     $pcmd set $bootn boot on # generally not needed on modern systems
 375     # the mkfs failed before on a vm, which prompted me to add
 376     # sleep .1
 377     # then it failed again on a physical machine
 378     # with:
 379     # Device /dev/disk/by-id/foo doesn't exist or access denied,
 380     # so I added a wait until it existed.
 381     # Then I added the mkfs.ext2, which claimed to succeed,
 382     # but then couldn't be found upon reboot. In that case we didn't
 383     # wait at all. So I've added a 3 second minimum wait.
 384     sleep 3
 385     secs=0
 386     while [[ ! -e `rootdev` ]] && (( secs < 10 )); do
 387       sleep 1
 388       secs=$((secs +1))
 389     done
 390     # Holds just a single file, rarely written, so
 391     # use ext2, like was often used for the /boot partition.
 392     # This exists because grub can only persist data to a non-cow fs.
 393     # And we use persisting a var in grub to do a one time boot.
 394     # We could pass the data on the kernel command line and persist it
 395     # to grubenv after booting, but that relies on the boot always succeeding.
 396     # This is just a bit more robust, and it could work for booting
 397     # into ipxe which can't persist data, if we ever got that working.
 398     mkfs.ext2 `grub_extdev`
 399     yes YES | cryptsetup luksFormat `rootdev` $luks_dir/host-$HOSTNAME \
 400                          -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 401     yes "$lukspw" | \
 402       cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 403                  `rootdev` || [[ $? == 141 ]]
 404     # background: Keyfile and password are treated just
 405     # like 2 ways to input a passphrase, so we don't actually need to have
 406     # different contents of keyfile and passphrase, but it makes some
 407     # security sense to a really big randomly generated passphrase
 408     # as much as possible, so we have both.
 409     #
 410     # This would remove the keyfile.
 411     #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 412       #                            /key/file || [[ $? == 141 ]]
 413
 414     cryptsetup luksOpen `rootdev` `root-cryptname` \
 415                --key-file $luks_dir/host-$HOSTNAME
 416
 417     if [[ $SPECIAL_DISK ]]; then
 418       exit 0
 419     fi
 420   done
 421   ls -la /dev/btrfs-control # this was probably for debugging...
 422   sleep 1
 423   bpart $(for dev in ${devs[@]}; do root-cryptdev; done)
 424   bpart ${boot_devs[@]}
 425 else
 426   for dev in ${devs[@]}; do
 427     mkfs.ext2 `grub_extdev`
 428     cryptsetup luksOpen `rootdev` `root-cryptname` \
 429                --key-file $luks_dir/host-$HOSTNAME
 430   done
 431   sleep 1
 432 fi
 433
 434
 435 if [[ $DISTRO != debianstretch_bootstrap ]]; then
 436   # bootstrap distro doesn't use separate encrypted root.
 437   mount -o subvolid=0 $first_root_crypt /mnt
 438   # systemd creates subvolumes we want to delete.
 439   s=($(btrfs subvolume list --sort=-path /mnt |
 440          sed -rn "s#^.*path\s*(root_$DISTRO/\S+)\s*\$#\1#p"))
 441   for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 442   btrfs subvolume set-default 0 /mnt
 443   [[ ! -e /mnt/root_$DISTRO ]] || btrfs subvolume delete /mnt/root_$DISTRO
 444
 445   ## create subvols ##
 446   cd /mnt
 447
 448   btrfs subvolume create root_$DISTRO
 449
 450   mkdir -p /mnt/root_$DISTRO/boot
 451   # could set default subvol like this, but no reason to.
 452   # btrfs subvolume set-default \
 453     #       $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
 454
 455   # no cow on the root filesystem. it's setup is fully scripted,
 456   # if it's messed up, we will just recreated it,
 457   # and we can get better perf with this.
 458   # I can't remember exactly why, but this is preferable to mounting with
 459   # -o nodatacow, I think because subvolumes inherit that.
 460   chattr -Rf +C root_$DISTRO
 461   cd /
 462   umount /mnt
 463 fi
 464
 465 mount -o subvolid=0 $first_boot_dev /mnt
 466 cd /mnt
 467 btrfs subvolume set-default 0 /mnt # already default, just ensuring it.
 468
 469 # for libreboot systems. grub2 only reads from subvolid=0
 470 mkdir -p /mnt/grub2
 471 cp $FAI/distro-install-common/libreboot_grub.cfg /mnt/grub2
 472
 473 if [[ $DISTRO == debianstretch_bootstrap ]]; then
 474   # this is just convenience for the libreboot_grub config
 475   # so we can glob the other ones easier.
 476   boot_vol=$DISTRO
 477 else
 478   boot_vol=boot_$DISTRO
 479 fi
 480 [[ ! -e /mnt/$boot_vol ]] || btrfs subvolume delete /mnt/$boot_vol
 481 btrfs subvolume create $boot_vol
 482 cd /
 483 umount /mnt
 484 ## end create subvols ##
 485
 486 dev=${boot_devs[0]}
 487 mount $first_grub_extdev /mnt
 488 grub-editenv /mnt/grubenv set did_fai_check=true
 489 grub-editenv /mnt/grubenv set last_boot=/$boot_vol
 490 umount /mnt
 491
 492 if [[ $DISTRO == debianstretch_bootstrap ]]; then
 493   cat > /tmp/fai/fstab <<EOF
 494 $first_boot_dev  /  btrfs  noatime,subvol=$boot_vol  0 0
 495 EOF
 496   cat >/tmp/fai/disk_var.sh <<EOF
 497 BOOT_DEVICE="${short_devs[@]}"
 498 ROOT_PARTITION=$first_boot_dev
 499 EOF
 500 else
 501   # note, fai creates the mountpoints listed here
 502   cat > /tmp/fai/fstab <<EOF
 503 $first_root_crypt  /  btrfs  noatime,subvol=root_$DISTRO  0 0
 504 $first_root_crypt  /mnt/root  btrfs  noatime,subvolid=0  0 0
 505 $first_boot_dev  /boot  btrfs  noatime,subvol=$boot_vol  0 0
 506 EOF
 507   swaps=()
 508   for dev in ${devs[@]}; do
 509     swaps+=(`swap-cryptname`)
 510     cat >>/tmp/fai/crypttab <<EOF
 511 `root-cryptname`  `rootdev`  none  keyscript=/root/keyscript,discard,luks
 512 `swap-cryptname` `swapdev`  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 513 EOF
 514     cat >> /tmp/fai/fstab <<EOF
 515 `swap-cryptdev`  none  swap  sw  0 0
 516 EOF
 517   done
 518
 519   # fai would do this:
 520   #BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 521
 522   # note: swaplist seems to do nothing.
 523   cat >/tmp/fai/disk_var.sh <<EOF
 524 BOOT_DEVICE="${short_devs[@]}"
 525 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 526 # ROOT_PARTITIONS is added by me, used in arch setup.
 527 ROOT_PARTITIONS="${root_devs[@]}"
 528 ROOT_PARTITION=\${ROOT_PARTITION:-$first_root_crypt}
 529 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 530 EOF
 531 fi