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