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
  50 partition=true
  51
  52 # somewhat crude detection of whether to partition
  53 for dev in ${devs[@]}; do
  54     x=($dev[0-9])
  55     [[ ${#x[@]}  == ${lastn} ]] || partition=true
  56     for (( i=1; i <= $lastn; i++ )); do
  57         [[ -e ${dev}$i ]] || partition=true
  58     done
  59     for part in $dev$rootn $dev$bootn; do
  60         # type tells us it's not totally blank
  61         blkid | grep "^${part}:.*TYPE=" &>/dev/null || partition=true
  62     done
  63 done
  64
  65 #partition=true # for temporarily override
  66
  67 # keyfiles generated like:
  68 # head -c 2048 /dev/urandom | od | s dd of=/q/root/luks/host-demohost
  69 luks_dir=${LUKS_DIR:-/var/lib/fai/config/distro-install-common/luks}
  70 if ifclass tp; then
  71     lukspw=$(cat $luks_dir/traci)
  72 else
  73     lukspw=$(cat $luks_dir/ian)
  74 fi
  75 if ifclass demohost; then
  76     lukspw=x
  77 fi
  78
  79
  80 crypt=/dev/mapper/crypt_dev_${d##/dev/}a$rootn
  81
  82
  83 if ifclass frodo; then
  84     # next upgrade is prolly 16 gigs of memory, across ~8 devices
  85     swap_end=$((3500 + boot_end))
  86 else
  87     # 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
  88     swap_end=$(( $(grep ^MemTotal: /proc/meminfo| awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1000 + boot_end ))
  89 fi
  90
  91 mkdir -p /tmp/fai
  92 shopt -s nullglob
  93 if $partition; then
  94     for dev in ${devs[@]}; do
  95         for x in $dev[0-9]; do wipefs -a $x; done
  96     done
  97     for dev in ${devs[@]}; do
  98         parted -s $dev mklabel gpt
  99         # gpt ubuntu cloud image uses ~4. fai uses 1 MiB. ehh, i'll do 4.
 100         # also, using MB instead of MiB causes complains about alignment.
 101         parted -s $dev mkpart primary "ext3" 4MB ${boot_end}MiB
 102         parted -s $dev mkpart primary "linux-swap" ${boot_end}MiB ${swap_end}MiB
 103         parted -s -- $dev mkpart primary "" ${swap_end}MiB -0
 104         parted -s $dev mkpart primary "" 1MiB 4MiB
 105         parted -s $dev set $bios_grubn bios_grub on
 106         parted -s $dev set $bootn boot on # generally not needed on modern systems
 107         # the mkfs failed randomly on a vm, so I threw a sleep in here.
 108         sleep .1
 109         mkfs.ext4 -F ${dev}1
 110         # 3 is device which simply holds a key for the 4's,
 111         # so we can unlock multi-device btrfs fs with 1 manually entered passphrase.
 112         #
 113         # Background: It's of course possible modify the initramfs to
 114         # put the input from a passphrase prompt into a variable and use
 115         # it to unlock multiple devices, but that would require figuring
 116         # more things out.
 117         #
 118         for luks_dev in ${dev}3; do
 119             yes YES | cryptsetup luksFormat $luks_dev $luks_dir/host-$HOSTNAME \
 120                                  -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 121             yes "$lukspw" | \
 122                 cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 123                            $luks_dev || [[ $? == 141 ]]
 124             # background: Keyfile and password are treated just
 125             # like 2 ways to input a passphrase, so we don't actually need to have
 126             # different contents of keyfile and passphrase, but it makes some
 127             # security sense to a really big randomly generated passphrase
 128             # as much as possible, so we have both.
 129             #
 130             # This would remove the keyfile.
 131             #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 132                 #                            /key/file || [[ $? == 141 ]]
 133
 134             cryptsetup luksOpen $luks_dev crypt_dev_${luks_dev##/dev/} \
 135                        --key-file $luks_dir/host-$HOSTNAME
 136         done
 137     done
 138     #bpart ${devs[@]/%/$rootn}
 139     bpart ${crypt_devs[@]/%/3}
 140     parted ${devs[0]} set 1 boot on
 141     mount $crypt /mnt
 142 else
 143     for dev in ${devs[@]}; do
 144         mkfs.ext4 -F ${dev}1
 145         cryptsetup luksOpen ${dev}3 crypt_dev_${dev##/dev/}3 \
 146                    --key-file $luks_dir/host-$HOSTNAME || [[ $? == 141 ]]
 147     done
 148     sleep 1
 149     mount -o subvolid=0 $crypt /mnt
 150     # systemd creates subvolumes we want to delete.
 151     s=($(btrfs subvolume list --sort=-path /mnt |
 152                 sed -rn 's#^.*path\s*(root/\S+)\s*$#\1#p'))
 153     for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 154     btrfs subvolume set-default 0 /mnt
 155     btrfs subvolume delete /mnt/root
 156 fi
 157
 158 ## create subvols ##
 159 cd /mnt
 160 for x in q home root; do
 161     btrfs subvolume list . | grep "$x$" >/dev/null || btrfs subvolume create $x
 162 done
 163 for x in root/a q/a; do
 164     mkdir -p $x
 165     chown 1000:1000 $x
 166     chmod 755 $x
 167 done
 168 btrfs subvolume set-default \
 169       $(btrfs subvolume list . | grep 'root$' | awk '{print $2}') .
 170 chattr -Rf +C root
 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 ${devs[0]}1  /boot  ext4  noatime  0 2
 183 EOF
 184
 185
 186 swaps=()
 187 for dev in ${devs[@]}; do
 188     s=crypt_swap_${dev##/dev/}$swapn
 189     swaps+=(/dev/mapper/$s)
 190     cat >>/tmp/fai/crypttab <<EOF
 191 crypt_dev_${dev##/dev/}$rootn  $dev$rootn  none  keyscript=/root/keyscript,discard,luks
 192 $s $dev$swapn  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 193 EOF
 194     cat >> /tmp/fai/fstab <<EOF
 195 /dev/mapper/$s  none  swap  sw  0 0
 196 EOF
 197 done
 198
 199
 200 # swaplist seems to do nothing.
 201 cat >/tmp/fai/disk_var.sh <<EOF
 202 ROOT_PARTITION=\${ROOT_PARTITION:-$crypt}
 203 BOOT_PARTITION=\${BOOT_PARTITION:-${devs[0]}1}
 204 BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 205 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 206 EOF