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