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 $?"' ERR
   5
   6 # # fai's setup-storage won't do btrfs on luks,
   7 # # so we do it ourself :)
   8
   9 skiptask partition ||: # for running out of fai
  10
  11 #### begin configuration
  12
  13 bootn=1
  14 swapn=2
  15 rootn=3
  16 bios_grubn=4
  17 boot_end=804
  18 lastn=$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() {
  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
  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$rootn
  82
  83
  84 if ifclass frodo; then
  85     # next upgrade is prolly 16 gigs of memory, across ~8 devices
  86     swap_end=$((3500 + boot_end))
  87 else
  88     # 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
  89     swap_end=$(( $(grep ^MemTotal: /proc/meminfo| awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1000 + boot_end ))
  90 fi
  91
  92 mkdir -p /tmp/fai
  93 shopt -s nullglob
  94 if $partition; then
  95     for dev in ${devs[@]}; do
  96         for x in $dev[0-9]; do wipefs -a $x; done
  97     done
  98     for dev in ${devs[@]}; do
  99         parted -s $dev mklabel gpt
 100         # gpt ubuntu cloud image uses ~4. fai uses 1 MiB. ehh, i'll do 4.
 101         # also, using MB instead of MiB causes complains about alignment.
 102         pcmd="parted -a optimal -s -- $dev"
 103         $pcmd mkpart primary "ext3" 4MB ${boot_end}MiB
 104         $pcmd mkpart primary "linux-swap" ${boot_end}MiB ${swap_end}MiB
 105         $pcmd mkpart primary "" ${swap_end}MiB -0
 106         $pcmd mkpart primary "" 1MiB 4MiB
 107         $pcmd set $bios_grubn bios_grub on
 108         $pcmd set $bootn boot on # generally not needed on modern systems
 109         # the mkfs failed randomly on a vm, so I threw a sleep in here.
 110         sleep .1
 111
 112
 113         luks_dev=$dev$rootn
 114         yes YES | cryptsetup luksFormat $luks_dev $luks_dir/host-$HOSTNAME \
 115                              -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 116         yes "$lukspw" | \
 117             cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 118                        $luks_dev || [[ $? == 141 ]]
 119         # background: Keyfile and password are treated just
 120         # like 2 ways to input a passphrase, so we don't actually need to have
 121         # different contents of keyfile and passphrase, but it makes some
 122         # security sense to a really big randomly generated passphrase
 123         # as much as possible, so we have both.
 124         #
 125         # This would remove the keyfile.
 126         #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 127             #                            /key/file || [[ $? == 141 ]]
 128
 129         cryptsetup luksOpen $luks_dev crypt_dev_${luks_dev##/dev/} \
 130                    --key-file $luks_dir/host-$HOSTNAME
 131     done
 132     bpart ${crypt_devs[@]/%/$rootn}
 133     mount $crypt /mnt
 134 else
 135     for dev in ${devs[@]}; do
 136         cryptsetup luksOpen $dev$rootn crypt_dev_${dev##/dev/}$rootn \
 137                    --key-file $luks_dir/host-$HOSTNAME || [[ $? == 141 ]]
 138     done
 139     sleep 1
 140     mount -o subvolid=0 $crypt /mnt
 141     # systemd creates subvolumes we want to delete.
 142     s=($(btrfs subvolume list --sort=-path /mnt |
 143                 sed -rn 's#^.*path\s*(root/\S+)\s*$#\1#p'))
 144     for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 145     btrfs subvolume set-default 0 /mnt
 146     btrfs subvolume delete /mnt/root
 147 fi
 148 bpart ${devs[@]/%/$bootn}
 149
 150
 151 ## create subvols ##
 152 cd /mnt
 153 for x in q home root; do
 154     btrfs subvolume list . | grep "$x$" >/dev/null || btrfs subvolume create $x
 155 done
 156 for x in root/a q/a; do
 157     mkdir -p $x
 158     chown 1000:1000 $x
 159     chmod 755 $x
 160 done
 161 btrfs subvolume set-default \
 162       $(btrfs subvolume list . | grep 'root$' | awk '{print $2}') .
 163 chattr -Rf +C root
 164 cd /
 165 umount /mnt
 166 mount $first_boot_dev /mnt
 167 cd /mnt
 168 btrfs subvolume create boot
 169 btrfs subvolume set-default \
 170       $(btrfs subvolume list . | grep 'boot$' | awk '{print $2}') .
 171 cd /
 172 umount /mnt
 173 ## end create subvols ##
 174
 175
 176
 177 cat > /tmp/fai/fstab <<EOF
 178 $crypt  /  btrfs  noatime,subvol=/root  0 0
 179 $crypt  /q  btrfs  noatime,subvol=/q  0 0
 180 /q/a  /a  none  bind  0 0
 181 $crypt  /home  btrfs  noatime,subvol=/home  0 0
 182 $first_boot_dev  /boot  btrfs  noatime,subvol=/boot  0 0
 183 EOF
 184
 185 swaps=()
 186 for dev in ${devs[@]}; do
 187     s=crypt_swap_${dev##/dev/}$swapn
 188     swaps+=(/dev/mapper/$s)
 189     cat >>/tmp/fai/crypttab <<EOF
 190 crypt_dev_${dev##/dev/}$rootn  $dev$rootn  none  keyscript=/root/keyscript,discard,luks
 191 $s $dev$swapn  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 192 EOF
 193     cat >> /tmp/fai/fstab <<EOF
 194 /dev/mapper/$s  none  swap  sw  0 0
 195 EOF
 196 done
 197
 198
 199 # swaplist seems to do nothing.
 200 cat >/tmp/fai/disk_var.sh <<EOF
 201 ROOT_PARTITION=\${ROOT_PARTITION:-$crypt}
 202 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 203 BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 204 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 205 EOF