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

   1 #!/bin/bash -x
   2
   3 set -eE -o pipefail
   4 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?"' ERR
   5
   6 # # fai's setup-storage won't do btrfs on luks,
   7 # # so we do it ourself :)
   8
   9 skiptask partition || ! type skiptask # for running not in fai
  10
  11 #### begin configuration
  12
  13 bootn=3
  14 rootn=1
  15 swapn=2
  16 bios_grubn=4
  17 boot_mib=1500
  18
  19
  20 ##### end configuration
  21
  22 if ifclass REPARTITION;then
  23     partition=true # force a full wipe
  24 else
  25     partition=false # change to true to force a full wipe
  26 fi
  27
  28 lastn=$bios_grubn
  29
  30
  31 hds=()
  32 ssds=()
  33 cd /sys/block
  34 for disk in [sv]d[a-z]; do
  35     case $(cat $disk/queue/rotational) in
  36         0) ssds+=(/dev/$disk) ;;
  37         1) hds+=(/dev/$disk) ;;
  38         *) echo "$0: error: unknown /sys/block/$disk/queue/rotational: \
  39 $(cat $disk/queue/rotational)"; exit 1 ;;
  40     esac
  41 done
  42
  43 # install all ssds, or if there are none, all hdds
  44 if (( ${#ssds[@]} > 0 )); then
  45     devs=( ${ssds[@]} )
  46 else
  47     devs=( ${hds[@]} )
  48 fi
  49
  50 boot_devs=()
  51 for dev in ${devs[@]}; do
  52     if ifclass frodo; then
  53         # I ran into a machine where the bios doesn't know about some disks,
  54         # so 1st stage of grub also doesn't know about them.
  55         # Also, grub does not support mounting degraded btrfs as far as
  56         # I can tell with some googling.
  57         # From within an arch install env, I could detect them by noting
  58         # their partitions were mixed with the next disk in /dev/disk/by-path,
  59         # and I have mixed model disks, and I could see the 8 models which showed
  60         # up in the bios, and thus see which 2 models were missing.
  61         # hdparm -I /dev/sdh will give model info in linux.
  62         # However, in fai on jessie, that dir doesn't exist,
  63         # and I don't see another way, so I'm hardcoding them.
  64         # We still put grub on them and partition them the same, for uniformity
  65         # and in case they get moved to a system that can recognize them,
  66         # we just exclude them from the boot filesystem.
  67         cd /dev/disk/by-id/
  68         bad_disk=false
  69         for id in ata-TOSHIBA_MD04ACA500_8539K4TQFS9A \
  70                       ata-TOSHIBA_MD04ACA500_Y5IFK6IJFS9A; do
  71             if [[ $(readlink -f $id) == $dev ]]; then
  72                 bad_disk=true
  73                 break
  74             fi
  75         done
  76         $bad_disk || boot_devs+=($dev$bootn)
  77     else
  78         boot_devs+=($dev$bootn)
  79     fi
  80 done
  81
  82 if [[ ! $DISTRO ]]; then
  83     if ifclass STABLE; then
  84         DISTRO=debianjessie
  85     else
  86         DISTRO=debiantesting
  87     fi
  88 fi
  89
  90
  91
  92 case ${#boot_devs[@]} in
  93     # need double the space if we are raid 10, and then
  94     # might as well give some extra overhead.
  95     [4-9]*|[1-3]?*) boot_mib=$((boot_mib * 3)) ;;
  96 esac
  97
  98
  99 bpart() { # btrfs a partition
 100     dev_n=$1
 101     case ${#@} in
 102         [1-3]) mkfs.btrfs -f $@ ;;
 103         [4-9]*|[1-3]?*) mkfs.btrfs -f -m raid10 -d raid10 $@ ;;
 104     esac
 105 }
 106
 107 first_boot_dev=${devs[0]}$bootn
 108
 109 crypt_devs=()
 110 # somewhat crude detection of whether to partition
 111 for dev in ${devs[@]}; do
 112     crypt_devs+=( /dev/mapper/crypt_dev_${dev#/dev/} )
 113     x=($dev[0-9])
 114     [[ ${#x[@]}  == ${lastn} ]] || partition=true
 115     for (( i=1; i <= $lastn; i++ )); do
 116         [[ -e ${dev}$i ]] || partition=true
 117     done
 118     for part in $dev$rootn $dev$bootn; do
 119         # type tells us it's not totally blank
 120         blkid | grep "^${part}:.*TYPE=" &>/dev/null || partition=true
 121     done
 122 done
 123
 124 # keyfiles generated like:
 125 # head -c 2048 /dev/urandom | od | s dd of=/q/root/luks/host-demohost
 126 luks_dir=${LUKS_DIR:-/var/lib/fai/config/distro-install-common/luks}
 127 if ifclass tp; then
 128     lukspw=$(cat $luks_dir/traci)
 129 else
 130     lukspw=$(cat $luks_dir/ian)
 131 fi
 132 if ifclass demohost; then
 133     lukspw=x
 134 fi
 135
 136
 137 crypt=${crypt_devs[0]}$rootn
 138
 139 bios_grub_end=4
 140 # 1.5 x based on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-disk-partitioning-setup-x86.html#sect-custom-partitioning-x86
 141 swap_mib=$(( $(grep ^MemTotal: /proc/meminfo | \
 142                       awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1024 ))
 143
 144 mkdir -p /tmp/fai
 145 shopt -s nullglob
 146 if $partition; then
 147     for dev in ${devs[@]}; do
 148         for x in $dev[0-9]; do
 149             count_down=10
 150             # wipefs has failed, manual run works, google suggests timing issue
 151             while ! wipefs -a $x; do
 152                 sleep 2
 153                 count_down=$((count_down - 1))
 154                 (( count_down > 0 )) || exit 1
 155             done
 156         done
 157     done
 158     for dev in ${devs[@]}; do
 159         # parted will round up the disk size. Do -1 so we can have
 160         # fully 1MiB unit partitions for easy resizing of the last partition.
 161         # Otherwise we would pass in -0 for the end argument for the last partition.
 162         disk_mib=$(( $(parted -m $dev unit MiB print | \
 163                               sed -nr "s#^$dev:([0-9]+).*#\1#p") - 1))
 164         root_end=$(( disk_mib - swap_mib - boot_mib /  ${#boot_devs[@]} ))
 165         swap_end=$(( root_end + swap_mib))
 166
 167         parted -s $dev mklabel gpt
 168         # gpt ubuntu cloud image uses ~4. fai uses 1 MiB.
 169         # I read something in the parted manual saying cheap flash media
 170         # likes to start at 4.
 171         # MiB because parted complains about alignment otherwise.
 172         pcmd="parted -a optimal -s -- $dev"
 173         $pcmd mkpart primary "ext3" 4MiB ${root_end}MiB
 174         $pcmd mkpart primary "linux-swap" ${root_end}MiB ${swap_end}MiB
 175         $pcmd mkpart primary "" ${swap_end}MiB ${disk_mib}MiB
 176         $pcmd mkpart primary "" 1MiB 4MiB
 177         $pcmd set $bios_grubn bios_grub on
 178         $pcmd set $bootn boot on # generally not needed on modern systems
 179         # the mkfs failed randomly on a vm, so I threw a sleep in here.
 180         sleep .1
 181
 182         luks_dev=$dev$rootn
 183         yes YES | cryptsetup luksFormat $luks_dev $luks_dir/host-$HOSTNAME \
 184                              -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 185         yes "$lukspw" | \
 186             cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 187                        $luks_dev || [[ $? == 141 ]]
 188         # background: Keyfile and password are treated just
 189         # like 2 ways to input a passphrase, so we don't actually need to have
 190         # different contents of keyfile and passphrase, but it makes some
 191         # security sense to a really big randomly generated passphrase
 192         # as much as possible, so we have both.
 193         #
 194         # This would remove the keyfile.
 195         #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 196             #                            /key/file || [[ $? == 141 ]]
 197
 198         cryptsetup luksOpen $luks_dev crypt_dev_${luks_dev##/dev/} \
 199                    --key-file $luks_dir/host-$HOSTNAME
 200     done
 201     bpart ${crypt_devs[@]/%/$rootn}
 202     bpart ${boot_devs[@]}
 203 else
 204     for dev in ${devs[@]}; do
 205         cryptsetup luksOpen $dev$rootn crypt_dev_${dev##/dev/}$rootn \
 206                    --key-file $luks_dir/host-$HOSTNAME || [[ $? == 141 ]]
 207     done
 208     sleep 1
 209 fi
 210
 211 mount -o subvolid=0 $crypt /mnt
 212 # systemd creates subvolumes we want to delete.
 213 s=($(btrfs subvolume list --sort=-path /mnt |
 214             sed -rn "s#^.*path\s*(root_$DISTRO/\S+)\s*\$#\1#p"))
 215 for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 216 btrfs subvolume set-default 0 /mnt
 217 [[ ! -e /mnt/root_$DISTRO ]] || btrfs subvolume delete /mnt/root_$DISTRO
 218
 219
 220 ## create subvols ##
 221 cd /mnt
 222 for x in q home_$DISTRO root_$DISTRO; do
 223     btrfs subvolume list . | grep "$x$" >/dev/null || btrfs subvolume create $x
 224     chown root:1000 q
 225 done
 226 mkdir -p /mnt/root_$DISTRO/boot
 227 for x in root/a q/a; do
 228     mkdir -p $x
 229     chown 1000:1000 $x
 230     chmod 755 $x
 231 done
 232 # could set default like this, but no reason to.
 233 # btrfs subvolume set-default \
 234     #       $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
 235 chattr -Rf +C root_$DISTRO
 236 cd /
 237 umount /mnt
 238 mount -o subvolid=0 $first_boot_dev /mnt
 239 cd /mnt
 240 btrfs subvolume set-default 0 /mnt
 241 [[ ! -e /mnt/boot_$DISTRO ]] || btrfs subvolume delete /mnt/boot_$DISTRO
 242 btrfs subvolume create boot_$DISTRO
 243 cd /
 244 umount /mnt
 245 ## end create subvols ##
 246
 247
 248
 249 cat > /tmp/fai/fstab <<EOF
 250 $crypt  /  btrfs  noatime,subvol=root_$DISTRO  0 0
 251 $crypt  /q  btrfs  noatime,subvol=q  0 0
 252 /q/a  /a  none  bind  0 0
 253 $crypt  /home  btrfs  noatime,subvol=home_$DISTRO  0 0
 254 $first_boot_dev  /boot  btrfs  noatime,subvol=boot_$DISTRO  0 0
 255 EOF
 256
 257 swaps=()
 258 for dev in ${devs[@]}; do
 259     s=crypt_swap_${dev##/dev/}$swapn
 260     swaps+=(/dev/mapper/$s)
 261     cat >>/tmp/fai/crypttab <<EOF
 262 crypt_dev_${dev##/dev/}$rootn  $dev$rootn  none  keyscript=/root/keyscript,discard,luks
 263 $s $dev$swapn  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 264 EOF
 265     cat >> /tmp/fai/fstab <<EOF
 266 /dev/mapper/$s  none  swap  sw  0 0
 267 EOF
 268 done
 269
 270 # fai would do this:
 271 #BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 272
 273 # swaplist seems to do nothing.
 274 cat >/tmp/fai/disk_var.sh <<EOF
 275 ROOT_PARTITION=\${ROOT_PARTITION:-$crypt}
 276 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 277 BOOT_DEVICE="${devs[@]}"
 278 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 279 EOF