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 $?"' ERR
   5
   6 # # fai's setup-storage won't do btrfs on luks,
   7 # # so we do it ourself :)
   8
   9 skiptask partition ||: # for running out of fai
  10
  11 #### begin configuration
  12
  13 bootn=3
  14 rootn=1
  15 swapn=2
  16 bios_grubn=4
  17 boot_mib=750
  18 lastn=$bios_grubn
  19
  20 if ifclass VM; then
  21     d=vd
  22 else
  23     d=sd
  24 fi
  25
  26 letters=()
  27 if ifclass TWO_DISK; then
  28     letters=(a b)
  29 elif ifclass ONE_DISK; then
  30     letters=(a)
  31 elif ifclass MANY_DISK; then
  32     for dev in /dev/${d}?; do letters+=(${dev#/dev/${d}}); done
  33 else
  34     exit 1
  35 fi
  36 ##### end configuration
  37
  38
  39 bpart() { # btrfs a partition
  40     dev_n=$1
  41     case ${#@} in
  42         [1-3]) mkfs.btrfs -f $@ ;;
  43         [4-9]*|[1-3]?*) mkfs.btrfs -f -m raid10 -d raid10 $@ ;;
  44     esac
  45 }
  46
  47 devs=(${letters[@]/#//dev/${d}})
  48 crypt_devs=(${letters[@]/#//dev/mapper/crypt_dev_${d}})
  49 first_boot_dev=${devs[0]}$bootn
  50
  51 partition=true # hardcoded for now
  52
  53 # somewhat crude detection of whether to partition
  54 for dev in ${devs[@]}; do
  55     x=($dev[0-9])
  56     [[ ${#x[@]}  == ${lastn} ]] || partition=true
  57     for (( i=1; i <= $lastn; i++ )); do
  58         [[ -e ${dev}$i ]] || partition=true
  59     done
  60     for part in $dev$rootn $dev$bootn; do
  61         # type tells us it's not totally blank
  62         blkid | grep "^${part}:.*TYPE=" &>/dev/null || partition=true
  63     done
  64 done
  65
  66 #partition=true # for temporarily override
  67
  68 # keyfiles generated like:
  69 # head -c 2048 /dev/urandom | od | s dd of=/q/root/luks/host-demohost
  70 luks_dir=${LUKS_DIR:-/var/lib/fai/config/distro-install-common/luks}
  71 if ifclass tp; then
  72     lukspw=$(cat $luks_dir/traci)
  73 else
  74     lukspw=$(cat $luks_dir/ian)
  75 fi
  76 if ifclass demohost; then
  77     lukspw=x
  78 fi
  79
  80
  81 crypt=/dev/mapper/crypt_dev_${d##/dev/}a$rootn
  82
  83 bios_grub_end=4
  84 # 1.5 x based on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-disk-partitioning-setup-x86.html#sect-custom-partitioning-x86
  85 swap_mib=$(( $(grep ^MemTotal: /proc/meminfo | \
  86                       awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1024 ))
  87 # parted will round up the disk size. Do -1 so we can have
  88 # fully 1MiB unit partitions for easy resizing of the last partition.
  89 # Otherwise we would pass in -0 for the end argument for the last partition.
  90 disk_mib=$(( $(parted -m ${devs[0]} unit MiB print | \
  91                       sed -nr "s#^${devs[0]}:([0-9]+).*#\1#p") - 1))
  92 root_end=$(( disk_mib - swap_mib - boot_mib ))
  93 swap_end=$(( root_end + swap_mib))
  94
  95 mkdir -p /tmp/fai
  96 shopt -s nullglob
  97 if $partition; then
  98     for dev in ${devs[@]}; do
  99         for x in $dev[0-9]; do
 100             count_down=10
 101             # wipefs has failed, manual run works, google suggests timing issue
 102             while ! wipefs -a $x; do
 103                 sleep 2
 104                 count_down=$((count_down - 1))
 105                 (( count_down > 0 )) || exit 1
 106             done
 107         done
 108     done
 109     for dev in ${devs[@]}; do
 110         parted -s $dev mklabel gpt
 111         # gpt ubuntu cloud image uses ~4. fai uses 1 MiB.
 112         # I read something in the parted manual saying cheap flash media
 113         # likes to start at 4.
 114         # MiB because parted complains about alignment otherwise.
 115         pcmd="parted -a optimal -s -- $dev"
 116         $pcmd mkpart primary "ext3" 4MiB ${root_end}MiB
 117         $pcmd mkpart primary "linux-swap" ${root_end}MiB ${swap_end}MiB
 118         $pcmd mkpart primary "" ${swap_end}MiB ${disk_mib}MiB
 119         $pcmd mkpart primary "" 1MiB 4MiB
 120         $pcmd set $bios_grubn bios_grub on
 121         $pcmd set $bootn boot on # generally not needed on modern systems
 122         # the mkfs failed randomly on a vm, so I threw a sleep in here.
 123         sleep .1
 124
 125         luks_dev=$dev$rootn
 126         yes YES | cryptsetup luksFormat $luks_dev $luks_dir/host-$HOSTNAME \
 127                              -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 128         yes "$lukspw" | \
 129             cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 130                        $luks_dev || [[ $? == 141 ]]
 131         # background: Keyfile and password are treated just
 132         # like 2 ways to input a passphrase, so we don't actually need to have
 133         # different contents of keyfile and passphrase, but it makes some
 134         # security sense to a really big randomly generated passphrase
 135         # as much as possible, so we have both.
 136         #
 137         # This would remove the keyfile.
 138         #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 139             #                            /key/file || [[ $? == 141 ]]
 140
 141         cryptsetup luksOpen $luks_dev crypt_dev_${luks_dev##/dev/} \
 142                    --key-file $luks_dir/host-$HOSTNAME
 143     done
 144     bpart ${crypt_devs[@]/%/$rootn}
 145     mount $crypt /mnt
 146 else
 147     for dev in ${devs[@]}; do
 148         cryptsetup luksOpen $dev$rootn crypt_dev_${dev##/dev/}$rootn \
 149                    --key-file $luks_dir/host-$HOSTNAME || [[ $? == 141 ]]
 150     done
 151     sleep 1
 152     mount -o subvolid=0 $crypt /mnt
 153     # systemd creates subvolumes we want to delete.
 154     s=($(btrfs subvolume list --sort=-path /mnt |
 155                 sed -rn 's#^.*path\s*(root/\S+)\s*$#\1#p'))
 156     for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 157     btrfs subvolume set-default 0 /mnt
 158     btrfs subvolume delete /mnt/root
 159 fi
 160 bpart ${devs[@]/%/$bootn}
 161
 162
 163 ## create subvols ##
 164 cd /mnt
 165 for x in q home root; do
 166     btrfs subvolume list . | grep "$x$" >/dev/null || btrfs subvolume create $x
 167 done
 168 for x in root/a q/a; do
 169     mkdir -p $x
 170     chown 1000:1000 $x
 171     chmod 755 $x
 172 done
 173 btrfs subvolume set-default \
 174       $(btrfs subvolume list . | grep 'root$' | awk '{print $2}') .
 175 chattr -Rf +C root
 176 cd /
 177 umount /mnt
 178 mount $first_boot_dev /mnt
 179 cd /mnt
 180 btrfs subvolume create boot
 181 btrfs subvolume set-default \
 182       $(btrfs subvolume list . | grep 'boot$' | awk '{print $2}') .
 183 cd /
 184 umount /mnt
 185 ## end create subvols ##
 186
 187
 188
 189 cat > /tmp/fai/fstab <<EOF
 190 $crypt  /  btrfs  noatime,subvol=/root  0 0
 191 $crypt  /q  btrfs  noatime,subvol=/q  0 0
 192 /q/a  /a  none  bind  0 0
 193 $crypt  /home  btrfs  noatime,subvol=/home  0 0
 194 $first_boot_dev  /boot  btrfs  noatime,subvol=/boot  0 0
 195 EOF
 196
 197 swaps=()
 198 for dev in ${devs[@]}; do
 199     s=crypt_swap_${dev##/dev/}$swapn
 200     swaps+=(/dev/mapper/$s)
 201     cat >>/tmp/fai/crypttab <<EOF
 202 crypt_dev_${dev##/dev/}$rootn  $dev$rootn  none  keyscript=/root/keyscript,discard,luks
 203 $s $dev$swapn  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 204 EOF
 205     cat >> /tmp/fai/fstab <<EOF
 206 /dev/mapper/$s  none  swap  sw  0 0
 207 EOF
 208 done
 209
 210
 211 # swaplist seems to do nothing.
 212 cat >/tmp/fai/disk_var.sh <<EOF
 213 ROOT_PARTITION=\${ROOT_PARTITION:-$crypt}
 214 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 215 BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 216 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 217 EOF