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
  51 if [[ ! $DISTRO ]]; then
  52     if ifclass STABLE; then
  53         DISTRO=debianjessie
  54     else
  55         DISTRO=debiantesting
  56     fi
  57 fi
  58
  59
  60
  61 bpart() { # btrfs a partition
  62     dev_n=$1
  63     case ${#@} in
  64         [1-3]) mkfs.btrfs -f $@ ;;
  65         [4-9]*|[1-3]?*) mkfs.btrfs -f -m raid10 -d raid10 $@ ;;
  66     esac
  67 }
  68
  69 first_boot_dev=${devs[0]}$bootn
  70
  71 crypt_devs=()
  72 # somewhat crude detection of whether to partition
  73 for dev in ${devs[@]}; do
  74     crypt_devs+=( /dev/mapper/crypt_dev_${dev#/dev/} )
  75     x=($dev[0-9])
  76     [[ ${#x[@]}  == ${lastn} ]] || partition=true
  77     for (( i=1; i <= $lastn; i++ )); do
  78         [[ -e ${dev}$i ]] || partition=true
  79     done
  80     for part in $dev$rootn $dev$bootn; do
  81         # type tells us it's not totally blank
  82         blkid | grep "^${part}:.*TYPE=" &>/dev/null || partition=true
  83     done
  84 done
  85
  86 # keyfiles generated like:
  87 # head -c 2048 /dev/urandom | od | s dd of=/q/root/luks/host-demohost
  88 luks_dir=${LUKS_DIR:-/var/lib/fai/config/distro-install-common/luks}
  89 if ifclass tp; then
  90     lukspw=$(cat $luks_dir/traci)
  91 else
  92     lukspw=$(cat $luks_dir/ian)
  93 fi
  94 if ifclass demohost; then
  95     lukspw=x
  96 fi
  97
  98
  99 crypt=${crypt_devs[0]}$rootn
 100
 101 bios_grub_end=4
 102 # 1.5 x based on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-disk-partitioning-setup-x86.html#sect-custom-partitioning-x86
 103 swap_mib=$(( $(grep ^MemTotal: /proc/meminfo | \
 104                       awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1024 ))
 105 # parted will round up the disk size. Do -1 so we can have
 106 # fully 1MiB unit partitions for easy resizing of the last partition.
 107 # Otherwise we would pass in -0 for the end argument for the last partition.
 108 disk_mib=$(( $(parted -m ${devs[0]} unit MiB print | \
 109                       sed -nr "s#^${devs[0]}:([0-9]+).*#\1#p") - 1))
 110 root_end=$(( disk_mib - swap_mib - boot_mib /  ${#devs[@]} ))
 111 swap_end=$(( root_end + swap_mib))
 112
 113 mkdir -p /tmp/fai
 114 shopt -s nullglob
 115 if $partition; then
 116     for dev in ${devs[@]}; do
 117         for x in $dev[0-9]; do
 118             count_down=10
 119             # wipefs has failed, manual run works, google suggests timing issue
 120             while ! wipefs -a $x; do
 121                 sleep 2
 122                 count_down=$((count_down - 1))
 123                 (( count_down > 0 )) || exit 1
 124             done
 125         done
 126     done
 127     for dev in ${devs[@]}; do
 128         parted -s $dev mklabel gpt
 129         # gpt ubuntu cloud image uses ~4. fai uses 1 MiB.
 130         # I read something in the parted manual saying cheap flash media
 131         # likes to start at 4.
 132         # MiB because parted complains about alignment otherwise.
 133         pcmd="parted -a optimal -s -- $dev"
 134         $pcmd mkpart primary "ext3" 4MiB ${root_end}MiB
 135         $pcmd mkpart primary "linux-swap" ${root_end}MiB ${swap_end}MiB
 136         $pcmd mkpart primary "" ${swap_end}MiB ${disk_mib}MiB
 137         $pcmd mkpart primary "" 1MiB 4MiB
 138         $pcmd set $bios_grubn bios_grub on
 139         $pcmd set $bootn boot on # generally not needed on modern systems
 140         # the mkfs failed randomly on a vm, so I threw a sleep in here.
 141         sleep .1
 142
 143         luks_dev=$dev$rootn
 144         yes YES | cryptsetup luksFormat $luks_dev $luks_dir/host-$HOSTNAME \
 145                              -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 146         yes "$lukspw" | \
 147             cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 148                        $luks_dev || [[ $? == 141 ]]
 149         # background: Keyfile and password are treated just
 150         # like 2 ways to input a passphrase, so we don't actually need to have
 151         # different contents of keyfile and passphrase, but it makes some
 152         # security sense to a really big randomly generated passphrase
 153         # as much as possible, so we have both.
 154         #
 155         # This would remove the keyfile.
 156         #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 157             #                            /key/file || [[ $? == 141 ]]
 158
 159         cryptsetup luksOpen $luks_dev crypt_dev_${luks_dev##/dev/} \
 160                    --key-file $luks_dir/host-$HOSTNAME
 161     done
 162     bpart ${crypt_devs[@]/%/$rootn}
 163     bpart ${devs[@]/%/$bootn}
 164 else
 165     for dev in ${devs[@]}; do
 166         cryptsetup luksOpen $dev$rootn crypt_dev_${dev##/dev/}$rootn \
 167                    --key-file $luks_dir/host-$HOSTNAME || [[ $? == 141 ]]
 168     done
 169     sleep 1
 170 fi
 171
 172 mount -o subvolid=0 $crypt /mnt
 173 # systemd creates subvolumes we want to delete.
 174 s=($(btrfs subvolume list --sort=-path /mnt |
 175             sed -rn "s#^.*path\s*(root_$DISTRO/\S+)\s*\$#\1#p"))
 176 for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 177 btrfs subvolume set-default 0 /mnt
 178 [[ ! -e /mnt/root_$DISTRO ]] || btrfs subvolume delete /mnt/root_$DISTRO
 179
 180
 181 ## create subvols ##
 182 cd /mnt
 183 for x in q home_$DISTRO root_$DISTRO; do
 184     btrfs subvolume list . | grep "$x$" >/dev/null || btrfs subvolume create $x
 185     chown root:1000 q
 186 done
 187 mkdir -p /mnt/root_$DISTRO/boot
 188 for x in root/a q/a; do
 189     mkdir -p $x
 190     chown 1000:1000 $x
 191     chmod 755 $x
 192 done
 193 # could set default like this, but no reason to.
 194 # btrfs subvolume set-default \
 195     #       $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
 196 chattr -Rf +C root_$DISTRO
 197 cd /
 198 umount /mnt
 199 mount -o subvolid=0 $first_boot_dev /mnt
 200 cd /mnt
 201 btrfs subvolume set-default 0 /mnt
 202 [[ ! -e /mnt/boot_$DISTRO ]] || btrfs subvolume delete /mnt/boot_$DISTRO
 203 btrfs subvolume create boot_$DISTRO
 204 cd /
 205 umount /mnt
 206 ## end create subvols ##
 207
 208
 209
 210 cat > /tmp/fai/fstab <<EOF
 211 $crypt  /  btrfs  noatime,subvol=root_$DISTRO  0 0
 212 $crypt  /q  btrfs  noatime,subvol=q  0 0
 213 /q/a  /a  none  bind  0 0
 214 $crypt  /home  btrfs  noatime,subvol=home_$DISTRO  0 0
 215 $first_boot_dev  /boot  btrfs  noatime,subvol=boot_$DISTRO  0 0
 216 EOF
 217
 218 swaps=()
 219 for dev in ${devs[@]}; do
 220     s=crypt_swap_${dev##/dev/}$swapn
 221     swaps+=(/dev/mapper/$s)
 222     cat >>/tmp/fai/crypttab <<EOF
 223 crypt_dev_${dev##/dev/}$rootn  $dev$rootn  none  keyscript=/root/keyscript,discard,luks
 224 $s $dev$swapn  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 225 EOF
 226     cat >> /tmp/fai/fstab <<EOF
 227 /dev/mapper/$s  none  swap  sw  0 0
 228 EOF
 229 done
 230
 231
 232 # swaplist seems to do nothing.
 233 cat >/tmp/fai/disk_var.sh <<EOF
 234 ROOT_PARTITION=\${ROOT_PARTITION:-$crypt}
 235 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 236 BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 237 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 238 EOF