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 $?"' ERR
   5
   6 # # fai's setup-storage won't do btrfs on luks,
   7 # # so we do it ourself :)
   8
   9 skiptask partition || ! type skiptask # for running not in fai
  10
  11 #### begin configuration
  12
  13 bootn=3
  14 rootn=1
  15 swapn=2
  16 bios_grubn=4
  17 boot_mib=750
  18 lastn=$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
  37 if [[ ! $DISTRO ]]; then
  38     if ifclass STABLE; then
  39         DISTRO=debianjessie
  40     else
  41         DISTRO=debiantesting
  42     fi
  43 fi
  44
  45 ##### end configuration
  46
  47
  48 bpart() { # btrfs a partition
  49     dev_n=$1
  50     case ${#@} in
  51         [1-3]) mkfs.btrfs -f $@ ;;
  52         [4-9]*|[1-3]?*) mkfs.btrfs -f -m raid10 -d raid10 $@ ;;
  53     esac
  54 }
  55
  56 devs=(${letters[@]/#//dev/${d}})
  57 crypt_devs=(${letters[@]/#//dev/mapper/crypt_dev_${d}})
  58 first_boot_dev=${devs[0]}$bootn
  59
  60 partition=true # hardcoded for now
  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 "^${part}:.*TYPE=" &>/dev/null || partition=true
  72     done
  73 done
  74
  75 #partition=true # for temporarily override
  76
  77 # keyfiles generated like:
  78 # head -c 2048 /dev/urandom | od | s dd of=/q/root/luks/host-demohost
  79 luks_dir=${LUKS_DIR:-/var/lib/fai/config/distro-install-common/luks}
  80 if ifclass tp; then
  81     lukspw=$(cat $luks_dir/traci)
  82 else
  83     lukspw=$(cat $luks_dir/ian)
  84 fi
  85 if ifclass demohost; then
  86     lukspw=x
  87 fi
  88
  89
  90 crypt=/dev/mapper/crypt_dev_${d##/dev/}a$rootn
  91
  92 bios_grub_end=4
  93 # 1.5 x based on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-disk-partitioning-setup-x86.html#sect-custom-partitioning-x86
  94 swap_mib=$(( $(grep ^MemTotal: /proc/meminfo | \
  95                       awk '{print $2}') * 3/(${#devs[@]} * 2 ) / 1024 ))
  96 # parted will round up the disk size. Do -1 so we can have
  97 # fully 1MiB unit partitions for easy resizing of the last partition.
  98 # Otherwise we would pass in -0 for the end argument for the last partition.
  99 disk_mib=$(( $(parted -m ${devs[0]} unit MiB print | \
 100                       sed -nr "s#^${devs[0]}:([0-9]+).*#\1#p") - 1))
 101 root_end=$(( disk_mib - swap_mib - boot_mib ))
 102 swap_end=$(( root_end + swap_mib))
 103
 104 mkdir -p /tmp/fai
 105 shopt -s nullglob
 106 if $partition; then
 107     for dev in ${devs[@]}; do
 108         for x in $dev[0-9]; do
 109             count_down=10
 110             # wipefs has failed, manual run works, google suggests timing issue
 111             while ! wipefs -a $x; do
 112                 sleep 2
 113                 count_down=$((count_down - 1))
 114                 (( count_down > 0 )) || exit 1
 115             done
 116         done
 117     done
 118     for dev in ${devs[@]}; do
 119         parted -s $dev mklabel gpt
 120         # gpt ubuntu cloud image uses ~4. fai uses 1 MiB.
 121         # I read something in the parted manual saying cheap flash media
 122         # likes to start at 4.
 123         # MiB because parted complains about alignment otherwise.
 124         pcmd="parted -a optimal -s -- $dev"
 125         $pcmd mkpart primary "ext3" 4MiB ${root_end}MiB
 126         $pcmd mkpart primary "linux-swap" ${root_end}MiB ${swap_end}MiB
 127         $pcmd mkpart primary "" ${swap_end}MiB ${disk_mib}MiB
 128         $pcmd mkpart primary "" 1MiB 4MiB
 129         $pcmd set $bios_grubn bios_grub on
 130         $pcmd set $bootn boot on # generally not needed on modern systems
 131         # the mkfs failed randomly on a vm, so I threw a sleep in here.
 132         sleep .1
 133
 134         luks_dev=$dev$rootn
 135         yes YES | cryptsetup luksFormat $luks_dev $luks_dir/host-$HOSTNAME \
 136                              -c aes-cbc-essiv:sha256 -s 256 || [[ $? == 141 ]]
 137         yes "$lukspw" | \
 138             cryptsetup luksAddKey --key-file $luks_dir/host-$HOSTNAME \
 139                        $luks_dev || [[ $? == 141 ]]
 140         # background: Keyfile and password are treated just
 141         # like 2 ways to input a passphrase, so we don't actually need to have
 142         # different contents of keyfile and passphrase, but it makes some
 143         # security sense to a really big randomly generated passphrase
 144         # as much as possible, so we have both.
 145         #
 146         # This would remove the keyfile.
 147         #    yes 'test' | cryptsetup luksRemoveKey /dev/... \
 148             #                            /key/file || [[ $? == 141 ]]
 149
 150         cryptsetup luksOpen $luks_dev crypt_dev_${luks_dev##/dev/} \
 151                    --key-file $luks_dir/host-$HOSTNAME
 152     done
 153     bpart ${crypt_devs[@]/%/$rootn}
 154     bpart ${devs[@]/%/$bootn}
 155 else
 156     for dev in ${devs[@]}; do
 157         cryptsetup luksOpen $dev$rootn crypt_dev_${dev##/dev/}$rootn \
 158                    --key-file $luks_dir/host-$HOSTNAME || [[ $? == 141 ]]
 159     done
 160     sleep 1
 161 fi
 162
 163 mount -o subvolid=0 $crypt /mnt
 164 # systemd creates subvolumes we want to delete.
 165 s=($(btrfs subvolume list --sort=-path /mnt |
 166             sed -rn "s#^.*path\s*(root_$DISTRO/\S+)\s*\$#\1#p"))
 167 for subvol in ${s[@]}; do btrfs subvolume delete /mnt/$subvol; done
 168 btrfs subvolume set-default 0 /mnt
 169 [[ ! -e /mnt/root_$DISTRO ]] || btrfs subvolume delete /mnt/root_$DISTRO
 170
 171
 172 ## create subvols ##
 173 cd /mnt
 174 for x in q home_$DISTRO root_$DISTRO; do
 175     btrfs subvolume list . | grep "$x$" >/dev/null || btrfs subvolume create $x
 176 done
 177 for x in root/a q/a; do
 178     mkdir -p $x
 179     chown 1000:1000 $x
 180     chmod 755 $x
 181 done
 182 btrfs subvolume set-default \
 183       $(btrfs subvolume list . | grep "root_$DISTRO$" | awk '{print $2}') .
 184 chattr -Rf +C root
 185 cd /
 186 umount /mnt
 187 mount $first_boot_dev /mnt
 188 cd /mnt
 189 [[ ! -e /mnt/boot_$DISTRO ]] || btrfs subvolume delete /mnt/boot_$DISTRO
 190 btrfs subvolume create boot_$DISTRO
 191 btrfs subvolume set-default \
 192       $(btrfs subvolume list . | grep "boot_$DISTRO$" | awk '{print $2}') .
 193 cd /
 194 umount /mnt
 195 ## end create subvols ##
 196
 197
 198
 199 cat > /tmp/fai/fstab <<EOF
 200 $crypt  /  btrfs  noatime,subvol=root_$DISTRO  0 0
 201 $crypt  /q  btrfs  noatime,subvol=q  0 0
 202 /q/a  /a  none  bind  0 0
 203 $crypt  /home  btrfs  noatime,subvol=home_$DISTRO  0 0
 204 $first_boot_dev  /boot  btrfs  noatime,subvol=boot_$DISTRO  0 0
 205 EOF
 206
 207 swaps=()
 208 for dev in ${devs[@]}; do
 209     s=crypt_swap_${dev##/dev/}$swapn
 210     swaps+=(/dev/mapper/$s)
 211     cat >>/tmp/fai/crypttab <<EOF
 212 crypt_dev_${dev##/dev/}$rootn  $dev$rootn  none  keyscript=/root/keyscript,discard,luks
 213 $s $dev$swapn  /dev/urandom  swap,cipher=aes-xts-plain64,size=256,hash=ripemd160
 214 EOF
 215     cat >> /tmp/fai/fstab <<EOF
 216 /dev/mapper/$s  none  swap  sw  0 0
 217 EOF
 218 done
 219
 220
 221 # swaplist seems to do nothing.
 222 cat >/tmp/fai/disk_var.sh <<EOF
 223 ROOT_PARTITION=\${ROOT_PARTITION:-$crypt}
 224 BOOT_PARTITION=\${BOOT_PARTITION:-$first_boot_dev}
 225 BOOT_DEVICE=\${BOOT_DEVICE:-"${devs[0]}"}
 226 SWAPLIST=\${SWAPLIST:-"${swaps[@]}"}
 227 EOF