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