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April 19, 2020 13:12
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#cat /usr/share/ubiquity/zsys-setup | |
#!/bin/sh | |
# | |
# This script creates ZFS pools and dataset compatible with zsys | |
# | |
# Layout: | |
# bpool/BOOT/ubuntu_${UUID} | |
# rpool/ROOT/ubuntu_${UUID} | |
# rpool/ROOT/ubuntu_${UUID}/var -o canmount=off | |
# rpool/ROOT/ubuntu_${UUID}/var/games | |
# rpool/ROOT/ubuntu_${UUID}/var/lib | |
# rpool/ROOT/ubuntu_${UUID}/var/lib/AccountServices | |
# rpool/ROOT/ubuntu_${UUID}/var/lib/apt | |
# rpool/ROOT/ubuntu_${UUID}/var/lib/dpkg | |
# rpool/ROOT/ubuntu_${UUID}/var/log | |
# rpool/ROOT/ubuntu_${UUID}/var/mail | |
# rpool/ROOT/ubuntu_${UUID}/var/snap | |
# rpool/ROOT/ubuntu_${UUID}/var/spool | |
# rpool/ROOT/ubuntu_${UUID}/var/www | |
# rpool/ROOT/ubuntu_${UUID}/var/lib/NetworkManager | |
# rpool/ROOT/ubuntu_${UUID}/srv | |
# rpool/ROOT/ubuntu_${UUID}/usr -o canmount=off | |
# rpool/ROOT/ubuntu_${UUID}/usr/local | |
# rpool/USERDATA/$user_$UUID2 | |
# rpool/USERDATA/root_$UUID2 | |
# | |
# Steps: | |
# - Verify that /target is mounted | |
# - Retrieve fstab | |
# - unmount /target | |
# - delete all the partitions but the ESP | |
# - Create p1 ext4 size 100MB | |
# - Create p2 zfs bpool 1GB | |
# - Create p3 zfs rbool 100% remaining | |
# - Create datasets | |
# - Create /swapfile on /target | |
# | |
# After setup is done leave it mounted to let Ubiquity proceed with installation | |
set -eu | |
REQUIREDPKGS="zfsutils-linux" | |
TARGET="/target" | |
ESP="${TARGET}/boot/efi" | |
ZSYSTMP="/tmp/$(basename $0)" | |
INIT_FLAG="${ZSYSTMP}/init.done" | |
FSTAB_PARTMAN="${ZSYSTMP}/fstab.partman" | |
PARTITION_LAYOUT="${ZSYSTMP}/layout" | |
mkdir -p "${ZSYSTMP}" | |
usage() { | |
# Display script usage | |
cat<<EOF | |
Usage: $(basename "$0") [COMMAND] [OPTIONS...] | |
Prepares a zsys compatible ZFS system. | |
Commands: | |
layout Get layout to display before formatting to ubiquity. Give the chosen disk as argument | |
init Initialize the pools and datasets | |
finalize Finalize the installation after the system has been installed | |
Options: | |
-h, --help This help | |
-d, --debug Enable debug mode | |
EOF | |
exit | |
} | |
SHORTOPTS="hd" | |
LONGOPTS="help,debug" | |
TEMP=$(getopt -o $SHORTOPTS --long $LONGOPTS -- "$@") | |
eval set -- "$TEMP" | |
while true ; do | |
case "$1" in | |
-h|--help) | |
usage;; | |
-d|--debug) | |
set -x | |
shift;; | |
--) | |
shift; | |
break;; | |
*) | |
usage;; | |
esac | |
done | |
COMMAND=$( echo $1| tr '[:upper:]' '[:lower:]' ) | |
EXTRAARG="" | |
if [ $# -gt 1 ]; then | |
EXTRAARG="${2}" | |
fi | |
check_prerequisites() { | |
# Check and set requirements to run this script | |
# | |
# Check and set the requirements to run this test. If any of the | |
# requirement is missing the programs exit with error | |
# | |
# Args: | |
# $@: List of required packages | |
# | |
# Returns | |
# Exit program is a requirement is not met | |
echo "I: Checking system requirements" | |
if [ $(id -u) -ne 0 ]; then | |
echo "E: Script must be executed as root. Exiting!" | |
exit 1 | |
fi | |
for pkg in $@; do | |
if ! dpkg-query -W -f'${Status}' "${pkg}"|grep -q "install ok installed" 2>/dev/null; then | |
echo "E: $pkg is required and not installed on this system. Exiting!" | |
exit 1 | |
fi | |
done | |
} | |
prepare_target() { | |
target="$1" | |
if ! grep -qE "\s${target}\s" /proc/mounts; then | |
echo "E: $target is not mounted. Exiting!" | |
exit 1 | |
fi | |
# Save fstab generated by partman | |
if [ -f "${target}/etc/fstab" ]; then | |
echo "I: Saving existing fstab" | |
cp "${target}/etc/fstab" "${FSTAB_PARTMAN}" | |
else | |
echo "W: ${target}/etc/fstab doesn't exist" | |
fi | |
# umount /target | |
# It may fail to umount because the swap is being created by partman and not finished when we reach this point. | |
# Give it some time and retry with a sleep between tries. | |
iter=0 | |
maxiter=10 | |
for mountpoint in "${ESP}" "${target}"; do | |
if [ ! -d "${mountpoint}" ]; then | |
continue | |
fi | |
echo "I: umounting ${mountpoint}" | |
while :; do | |
# Do not make it quiet. We want to know why it failed. | |
if ! sudo umount "${mountpoint}"; then | |
iter=$(( iter + 1 )) | |
echo "W: Try ${iter}. Failed to umount ${mountpoint}." | |
if [ ${iter} -eq ${maxiter} ]; then | |
echo "E: Failed to umount ${mountpoint}. Exiting!" | |
exit 1 | |
fi | |
sleep 3 | |
else | |
break | |
fi | |
done | |
done | |
} | |
get_layout() { | |
# Returns disk, base name of the partition and partition numbers to create | |
target="$1" | |
disk="$2" | |
if [ -z "${disk}" ]; then | |
# The entire disk has been formatted with use_device | |
# There is either one ext4 partition or one ext4 and one ESP | |
part="$(grep -E "\s${target}\s" /proc/mounts | awk '{print $1}')" | |
partbase="" | |
if [ -n "${part}" ]; then | |
disk="$(lsblk -lns -o TYPE,PATH ${part}| grep disk| awk '{print $2}')" | |
if [ -z "${disk}" ]; then | |
echo "E: Couldn't identify disk for partition ${part}. Exiting!" | |
exit 1 | |
fi | |
# Some disks have letters in the partition number like /dev/nvme0n1p1 | |
# In this case we want to retrieve 'p' so we deal only with partition number | |
# in the rest of the script and prepend the base. | |
partbase="$(echo ${part} | sed -e 's/[0-9]*$//' | sed -e "s#${disk}##")" | |
fi | |
else | |
# The only purpose of this code is to display a friendly message in ubiquity to show the user | |
# what partitioning will be performed. However, on first call, the disk is not yet partitioned | |
# and collecting the information about disk partitioning would require to query partman. But we | |
# don't want to add this extra complexity just to display a message. Instead we hardcode the | |
# extension of the partition name depending on the type of disk, basically it's 'p' for anything | |
# else than standard drives (eg nvme01pX) | |
case "${disk}" in | |
/dev/sd*|/dev/hd*|/dev/vd*) | |
partbase="" | |
;; | |
*) | |
partbase="p" | |
esac | |
fi | |
partesp=1 | |
if is_gpt "${disk}"; then | |
# No extended partition on EFI + GPT | |
# The layout is | |
# 1: ESP | |
# 2: swap | |
# 3: bpool | |
# 4: rpool | |
partswap=2 | |
partbpool=3 | |
partrpool=4 | |
else | |
# MBR pools are on extended partition | |
# The layout is: | |
# 1: ESP | |
# 2: Extended | |
# 5: swap | |
# 6: bpool | |
# 7: rpool | |
partswap=5 | |
partbpool=6 | |
partrpool=7 | |
fi | |
echo "OK|${disk}|${partbase}|${partesp}|${partswap}|${partbpool}|${partrpool}" | |
} | |
format_disk() { | |
disk="$1" | |
partbase="$2" | |
partesp="$3" | |
partbpool="$4" | |
partrpool="$5" | |
ss="$6" | |
partswap=$(( partbpool - 1 )) | |
partext=$(( partesp + 1 )) | |
partprefix="${disk}${partbase}" | |
sfdisktmp="${ZSYSTMP}/sfdisk.cfg" | |
rm -f "${sfdisktmp}" | |
echo "I: Formatting disk $disk with partitions ESP:${partesp} ext:${partext} swap:${partswap} bpool:${partbpool} rpool:${partrpool}" | |
# bpool size: 500M < 5% of ZFS allocated space < 2G | |
# partswap is partition 2 on GPT systems and first extended partition on MBR. | |
size_percent=$(expr \( $(blockdev --getsize64 ${partprefix}${partswap}) / 1024 / 1024 \) \* 5 / 100) | |
bpool_size=500 | |
[ ${size_percent} -gt ${bpool_size} ] && bpool_size=${size_percent} | |
[ ${bpool_size} -gt 2048 ] && bpool_size=2048 | |
if is_gpt "${disk}"; then | |
# Improvement: Delete all the partitions but the ESP | |
# There should be only 1 or 2 partitions but it can be made generic | |
if ! esp_exists "${disk}"; then | |
start=$(sfdisk -l "${disk}"|grep "^${partprefix}${partesp}"|awk '{print $2}') | |
cat > "${sfdisktmp}" <<EOF | |
${partprefix}${partesp} : start= ${start}, size= 512M, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, bootable | |
EOF | |
else | |
sfdisk --delete "${disk}" ${partswap} | |
fi | |
cat >> "${sfdisktmp}" <<EOF | |
${partprefix}${partswap} : size= ${ss}M, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F | |
${partprefix}${partbpool} : size= ${bpool_size}M, type=6A82CB45-1DD2-11B2-99A6-080020736631 | |
${partprefix}${partrpool} : type=6A85CF4D-1DD2-11B2-99A6-080020736631 | |
EOF | |
else | |
if ! esp_exists "${disk}"; then | |
start=$(sfdisk -l "${disk}"|grep "^${partprefix}${partesp}"|awk '{print $2}') | |
cat > "${sfdisktmp}" <<EOF | |
${partprefix}${partesp} : start= ${start}, size= 512M, type=ef, bootable | |
EOF | |
else | |
sfdisk --delete "${disk}" ${partswap} | |
fi | |
cat >> "${sfdisktmp}" <<EOF | |
${partprefix}${partswap} : size= ${ss}M, type=82 | |
${partprefix}${partbpool} : size= ${bpool_size}M, type=a5 | |
${partprefix}${partrpool} : type=a5 | |
EOF | |
fi | |
cat "${sfdisktmp}" | sfdisk --append "${disk}" | |
# Force a re-read of the partition table | |
echo "I: Re-reading partition table" | |
partx --add "${disk}" 2>/dev/null || true | |
partx --show "${disk}" | |
} | |
init_zfs() { | |
target="$1" | |
partbpool="$2" | |
partrpool="$3" | |
echo "I: Initializing ZFS" | |
# Now we can create the pools and dataset | |
UUID_ORIG=$(head -100 /dev/urandom | tr -dc 'a-z0-9' |head -c6) | |
# Pools | |
# rpool | |
zpool create -f \ | |
-o ashift=12 \ | |
-O compression=lz4 \ | |
-O acltype=posixacl \ | |
-O xattr=sa \ | |
-O relatime=on \ | |
-O normalization=formD \ | |
-O mountpoint=/ \ | |
-O canmount=off \ | |
-O dnodesize=auto \ | |
-O sync=disabled \ | |
-O mountpoint=/ -R "${target}" rpool "${partrpool}" | |
# bpool | |
# The version of bpool is set to the default version to prevent users from upgrading | |
# Then only features supported by grub are enabled. | |
zpool create -f \ | |
-o ashift=12 \ | |
-d \ | |
-o feature@async_destroy=enabled \ | |
-o feature@bookmarks=enabled \ | |
-o feature@embedded_data=enabled \ | |
-o feature@empty_bpobj=enabled \ | |
-o feature@enabled_txg=enabled \ | |
-o feature@extensible_dataset=enabled \ | |
-o feature@filesystem_limits=enabled \ | |
-o feature@hole_birth=enabled \ | |
-o feature@large_blocks=enabled \ | |
-o feature@lz4_compress=enabled \ | |
-o feature@spacemap_histogram=enabled \ | |
-O compression=lz4 \ | |
-O acltype=posixacl \ | |
-O xattr=sa \ | |
-O relatime=on \ | |
-O normalization=formD \ | |
-O canmount=off \ | |
-O devices=off \ | |
-O mountpoint=/boot -R "${target}" bpool "${partbpool}" | |
# Root and boot dataset | |
zfs create rpool/ROOT -o canmount=off -o mountpoint=none | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}" -o mountpoint=/ | |
zfs create bpool/BOOT -o canmount=off -o mountpoint=none | |
zfs create "bpool/BOOT/ubuntu_${UUID_ORIG}" -o mountpoint=/boot | |
# System dataset | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var" -o canmount=off | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/lib" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/lib/AccountServices" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/lib/apt" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/lib/dpkg" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/lib/NetworkManager" | |
# Desktop specific system dataset | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/srv" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/usr" -o canmount=off | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/usr/local" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/games" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/log" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/mail" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/snap" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/spool" | |
zfs create "rpool/ROOT/ubuntu_${UUID_ORIG}/var/www" | |
# USERDATA datasets | |
# Dataset associated to the user are created by the installer. | |
zfs create rpool/USERDATA -o canmount=off -o mountpoint=/ | |
# Set zsys properties | |
zfs set com.ubuntu.zsys:bootfs='yes' "rpool/ROOT/ubuntu_${UUID_ORIG}" | |
zfs set com.ubuntu.zsys:last-used=$(date +%s) "rpool/ROOT/ubuntu_${UUID_ORIG}" | |
zfs set com.ubuntu.zsys:bootfs='no' "rpool/ROOT/ubuntu_${UUID_ORIG}/srv" | |
zfs set com.ubuntu.zsys:bootfs='no' "rpool/ROOT/ubuntu_${UUID_ORIG}/usr" | |
zfs set com.ubuntu.zsys:bootfs='no' "rpool/ROOT/ubuntu_${UUID_ORIG}/var" | |
} | |
move_user () { | |
target="$1" | |
user="$2" | |
userhome="$3" | |
uuid="$4" | |
echo "I: Creating user $user with home $userhome" | |
mv "${target}/${userhome}" "${target}/tmp/home/${user}" | |
zfs create "rpool/USERDATA/${user}_${uuid}" -o canmount=on -o mountpoint=${userhome} | |
chown $(chroot "${target}" id -u ${user}):$(chroot ${target} id -g ${user}) "${target}/${userhome}" | |
rsync -a "${target}/tmp/home/${user}/" "${target}/${userhome}" | |
bootfsdataset=$(grep "\s${target}\s" /proc/mounts | awk '{ print $1 }') | |
zfs set com.ubuntu.zsys:bootfs-datasets="${bootfsdataset}" rpool/USERDATA/${user}_${UUID_ORIG} | |
} | |
init_system_partitions() { | |
target="$1" | |
partefi="$2" | |
partgrub="$3" | |
# ESP | |
mkdir -p "${target}/boot/efi" | |
mount -t vfat "${partefi}" "${target}/boot/efi" | |
mkdir -p "${target}/boot/efi/grub" | |
echo "I: Mount grub directory" | |
# Finalize grub directory | |
mkdir -p "${target}/boot/grub" | |
mount -o bind "${target}/boot/efi/grub" "${target}/boot/grub" | |
} | |
esp_exists() { | |
if is_gpt "${1}"; then | |
parttype="C12A7328-F81F-11D2-BA4B-00A0C93EC93B" | |
else | |
# FIXME: Currently partman-auto set the type of EFI on MBR as W95 (b) instead of EFI (ef) | |
parttype="b" | |
fi | |
sfdisk -d "${1}" | grep -q "type=${parttype}" | |
} | |
is_gpt() { | |
sfdisk -d "${1}" | awk '/^label:/ {print $2}'|grep -q gpt | |
} | |
check_prerequisites ${REQUIREDPKGS} | |
echo "I: Running $(basename "$0") ${COMMAND}" | |
if [ -z "${COMMAND}" ]; then | |
echo "E: ${COMMAND} is mandatory. Exiting!" | |
exit 1 | |
elif [ "${COMMAND}" = "layout" ]; then | |
# Just displays de layout that will be created without any change to the disk. | |
# At this stage we don't now yet the size of the partition that will be created. | |
IFS="|" read ERR DISK PARTBASE PARTESP PARTSWAP PARTBPOOL PARTRPOOL<<EOF | |
$(get_layout ${TARGET} "${EXTRAARG}") | |
EOF | |
if [ "${ERR}" != "OK" ]; then | |
echo "${ERR}" | |
exit 1 | |
fi | |
cat > "${PARTITION_LAYOUT}" <<EOF | |
disk:${DISK} | |
EOF | |
if ! esp_exists "${DISK}"; then | |
cat >> "${PARTITION_LAYOUT}" <<EOF | |
part:vfat:ESP:${DISK}${PARTBASE}${PARTESP} | |
EOF | |
fi | |
cat >> "${PARTITION_LAYOUT}" <<EOF | |
part:swap:swap:${DISK}${PARTBASE}${PARTSWAP} | |
part:zfs:bpool:${DISK}${PARTBASE}${PARTBPOOL} | |
part:zfs:rpool:${DISK}${PARTBASE}${PARTRPOOL} | |
EOF | |
elif [ "${COMMAND}" = "init" ]; then | |
rm -f "${INIT_FLAG}" | |
IFS="|" read ERR DISK PARTBASE PARTESP PARTSWAP PARTBPOOL PARTRPOOL<<EOF | |
$(get_layout ${TARGET} "") | |
EOF | |
if [ "${ERR}" != "OK" ]; then | |
echo "${ERR}" | |
exit 1 | |
fi | |
echo "I: Partition table before init of ZFS" | |
partx --show "${DISK}" | |
# Swap files are not supported on ZFS, we use a swap partition instead: | |
SWAPFILE="$(grep "^${TARGET}" /proc/swaps |awk '{print $1}')" | |
# Give us a minimum swap partition size of 4MB in case we decide on | |
# no swap, just to keep the partition layout stable: | |
SWAPSIZE=4194304 | |
# Disable swap and get the swap volume size: | |
if [ -n "${SWAPFILE}" ]; then | |
SWAPSIZE=$(stat -c%s "${SWAPFILE}") | |
echo "I: Found swapfile with size ${SWAPSIZE}. Disabling" | |
swapoff "${SWAPFILE}" | |
fi | |
# Convert to MiB to align the size on the size of a block | |
SWAPVOLSIZE=$(( SWAPSIZE / 1024 / 1024 )) | |
prepare_target "${TARGET}" | |
format_disk "${DISK}" "${PARTBASE}" "${PARTESP}" "${PARTBPOOL}" "${PARTRPOOL}" "${SWAPVOLSIZE}" | |
init_zfs "${TARGET}" "${DISK}${PARTBASE}${PARTBPOOL}" "${DISK}${PARTBASE}${PARTRPOOL}" | |
init_system_partitions "${TARGET}" "${DISK}${PARTBASE}1" "${DISK}${PARTBASE}${PARTESP}" | |
# Generate fstab | |
# $TARGET/etc has been destroyed by the creation of the zfs partitition | |
# Recreate it | |
mkdir -p "${TARGET}/etc" | |
if [ -f "${FSTAB_PARTMAN}" ]; then | |
echo "I: Creating fstab" | |
grep -Ev '\s/\s|/swapfile' "${FSTAB_PARTMAN}" > "${TARGET}/etc/fstab" | |
fi | |
if ! grep -q "boot/efi" "${TARGET}/etc/fstab"; then | |
espuuid=$(blkid -s UUID -o value "${DISK}${PARTBASE}${PARTESP}") | |
echo "UUID=${espuuid}\t/boot/efi\tvfat\tumask=0077\t0\t1" >> "${TARGET}/etc/fstab" | |
fi | |
# Bind mount grub from ESP to the expected location | |
echo "/boot/efi/grub\t/boot/grub\tnone\tdefaults,bind\t0\t0" >> "${TARGET}/etc/fstab" | |
if [ -n "${SWAPFILE}" ]; then | |
SWAPDEVICE="${DISK}${PARTBASE}${PARTSWAP}" | |
mkswap -f "${SWAPDEVICE}" | |
SWAPID=$(blkid -s UUID -o value "${SWAPDEVICE}") | |
printf "UUID=${SWAPID}\tnone\tswap\tdiscard\t0\t0\n" >> "${TARGET}/etc/fstab" | |
swapon -v "${SWAPDEVICE}" | |
fi | |
echo "I: Marking ZFS utilities to be kept in the target system" | |
apt-install zfsutils-linux 2>/dev/null | |
apt-install zfs-initramfs 2>/dev/null | |
apt-install zsys 2>/dev/null | |
touch "$INIT_FLAG" | |
elif [ "${COMMAND}" = "finalize" ]; then | |
if [ ! -f "$INIT_FLAG" ]; then | |
echo "W: zsys init didn't succeed. Not proceeding with command: ${COMMAND}. Aborting!" | |
exit 1 | |
fi | |
# Activate zfs generator. | |
# After enabling the generator we should run zfs set canmount=on DATASET | |
# in the chroot for one dataset of each pool to refresh the zfs cache. | |
echo "I: Activating zfs generator" | |
ln -s /usr/lib/zfs-linux/zed.d/history_event-zfs-list-cacher.sh "${TARGET}/etc/zfs/zed.d" | |
# Create zpool cache | |
zpool set cachefile= bpool | |
zpool set cachefile= rpool | |
cp /etc/zfs/zpool.cache "${TARGET}/etc/zfs/" | |
mkdir -p "${TARGET}/etc/zfs/zfs-list.cache" | |
touch "${TARGET}/etc/zfs/zfs-list.cache/bpool" "${TARGET}/etc/zfs/zfs-list.cache/rpool" | |
# Handle userdata | |
UUID_ORIG=$(head -100 /dev/urandom | tr -dc 'a-z0-9' |head -c6) | |
mkdir -p "${TARGET}/tmp/home" | |
for user in ${TARGET}/home/*; do | |
if [ -d "${user}" ]; then | |
user="$(basename $user)" | |
move_user "${TARGET}" "${user}" "/home/${user}" "${UUID_ORIG}" | |
fi | |
done | |
move_user "${TARGET}" root /root "${UUID_ORIG}" | |
echo "I: Changing sync mode of rpool to standard" | |
zfs set sync=standard rpool | |
echo "I: ZFS setup complete" | |
else | |
echo "E: Unknown command: $COMMAND" | |
exit 1 | |
fi |
Do you think it is not working, or do you have a use case where it does not work? Because the sed syntax you post is exactly equivalent to the one used in the script, but yours will fail if ${disk} contains any "/", which is guaranteed failure. On the other hand, the syntax used in the script will only fail if ${disk} contains a "#", which is less likely.
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Not yet in the last 20.04 update. I don't expect it to be fixed anyway as the whole zsys-setup is an ugly installation hack.