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zfs-utils/zfs-utils.initcpio.hook

236 lines
8.2 KiB

#
# WARNING: This script is parsed by ash in busybox at boot time, not bash!
# http://linux.die.net/man/1/ash
# https://wiki.ubuntu.com/DashAsBinSh
# http://www.jpsdomain.org/public/2008-JP_bash_vs_dash.pdf
#
ZPOOL_FORCE=""
ZPOOL_IMPORT_FLAGS=""
ZFS_BOOT_ONLY=""
zfs_get_bootfs () {
for zfs_dataset in $(zpool list -H -o bootfs); do
case ${zfs_dataset} in
"" | "-")
# skip this line/dataset
;;
"no pools available")
return 1
;;
*)
ZFS_DATASET=${zfs_dataset}
return 0
;;
esac
done
return 1
}
zfs_decrypt_fs() {
dataset=$1
# Make sure dataset is encrypted; get fails if ZFS does not support encryption
encryption="$(zfs get -H -o value encryption "${dataset}" 2>/dev/null)" || return 0
[ "${encryption}" != "off" ] || return 0
# Make sure the dataset is locked
keystatus="$(zfs get -H -o value keystatus "${dataset}")" || return 0
[ "${keystatus}" != "available" ] || return 0
# Make sure the encryptionroot is sensible
encryptionroot="$(zfs get -H -o value encryptionroot "${dataset}")" || return 0
[ "${encryptionroot}" != "-" ] || return 0
# Export encryption root to be used by other hooks (SSH)
echo "${encryptionroot}" > /.encryptionroot
prompt_override=""
if keylocation="$(zfs get -H -o value keylocation "${encryptionroot}")"; then
# If key location is a file, determine if it can by overridden by prompt
if [ "${keylocation}" != "prompt" ]; then
if keyformat="$(zfs get -H -o value keyformat "${encryptionroot}")"; then
[ "${keyformat}" = "passphrase" ] && prompt_override="yes"
fi
fi
# If key location is a local file, check if file exists
if [ "${keylocation%%://*}" = "file" ]; then
keyfile="${keylocation#file://}"
# If file not yet exist, wait for udev to create device nodes
if [ ! -r "${keyfile}" ]; then
udevadm settle
# Wait for udev up to 10 seconds
if [ ! -r "${keyfile}" ]; then
echo "Waiting for key ${keyfile} for ${encryptionroot}..."
for _ in $(seq 1 20); do
sleep 0.5s
[ -r "${keyfile}" ] && break
done
fi
if [ ! -r "${keyfile}" ]; then
echo "Key ${keyfile} for ${encryptionroot} hasn't appeared. Trying anyway."
fi
fi
fi
fi
# Loop until key is loaded here or by another vector (SSH, for instance)
while [ "$(zfs get -H -o value keystatus "${encryptionroot}")" != "available" ]; do
# Try the default loading mechanism
zfs load-key "${encryptionroot}" && break
# Load failed, try a prompt if the failure was not a prompt
if [ -n "${prompt_override}" ]; then
echo "Unable to load key ${keylocation}; please type the passphrase"
echo "To retry the file, interrupt now or repeatedly input a wrong passphrase"
zfs load-key -L prompt "${encryptionroot}" && break
fi
# Throttle retry attempts
sleep 2
done
if [ -f /.encryptionroot ]; then
rm /.encryptionroot
fi
}
zfs_mount_handler () {
if [ "${ZFS_DATASET}" = "bootfs" ] ; then
if ! zfs_get_bootfs ; then
# Lets import everything and try again
zpool import ${ZPOOL_IMPORT_FLAGS} -N -a ${ZPOOL_FORCE}
if ! zfs_get_bootfs ; then
err "ZFS: Cannot find bootfs."
exit 1
fi
fi
fi
local pool="${ZFS_DATASET%%/*}"
local rwopt_exp="${rwopt:-ro}"
if ! zpool list -H "${pool}" > /dev/null 2>&1; then
if [ ! "${rwopt_exp}" = "rw" ]; then
msg "ZFS: Importing pool ${pool} readonly."
ZPOOL_IMPORT_FLAGS="${ZPOOL_IMPORT_FLAGS} -o readonly=on"
else
msg "ZFS: Importing pool ${pool}."
fi
if ! zpool import ${ZPOOL_IMPORT_FLAGS} -N "${pool}" ${ZPOOL_FORCE} ; then
err "ZFS: Unable to import pool ${pool}."
exit 1
fi
fi
local node="$1"
local rootmnt=$(zfs get -H -o value mountpoint "${ZFS_DATASET}")
local tab_file="/etc/fstab"
local zfs_datasets="$(zfs list -H -o name -t filesystem -r ${ZFS_DATASET})"
# Mount the root, and any child datasets
for dataset in ${zfs_datasets}; do
mountpoint=$(zfs get -H -o value mountpoint "${dataset}")
canmount=$(zfs get -H -o value canmount "${dataset}")
# skip dataset
[ ${dataset} != "${ZFS_DATASET}" -a \( ${canmount} = "off" -o ${canmount} = "noauto" -o ${mountpoint} = "none" \) ] && continue
if [ ${mountpoint} = "legacy" ]; then
if [ -f "${tab_file}" ]; then
if findmnt -snero source -F "${tab_file}" -S "${dataset}" > /dev/null 2>&1; then
opt=$(findmnt -snero options -F "${tab_file}" -S "${dataset}")
mnt=$(findmnt -snero target -F "${tab_file}" -S "${dataset}")
zfs_decrypt_fs "${dataset}"
mount -t zfs -o "${opt}" "${dataset}" "${node}${mnt}"
fi
fi
else
zfs_decrypt_fs "${dataset}"
mount -t zfs -o "zfsutil,${rwopt_exp}" "${dataset}" "${node}/${mountpoint##${rootmnt}}"
fi
done
}
set_flags() {
# Force import the pools, useful if the pool has not properly been exported using 'zpool export <pool>'
[ ! "${zfs_force}" = "" ] && ZPOOL_FORCE="-f"
# Disable late hook, useful if we want to use zfs-import-cache.service instead
[ ! "${zfs_boot_only}" = "" ] && ZFS_BOOT_ONLY="1"
# Add import directory to import command flags
[ ! "${zfs_import_dir}" = "" ] && ZPOOL_IMPORT_FLAGS="${ZPOOL_IMPORT_FLAGS} -d ${zfs_import_dir}"
[ "${zfs_import_dir}" = "" ] && [ -f /etc/zfs/zpool.cache.org ] && ZPOOL_IMPORT_FLAGS="${ZPOOL_IMPORT_FLAGS} -c /etc/zfs/zpool.cache.org"
}
run_hook() {
set_flags
# Wait 15 seconds for ZFS devices to show up
[ "${zfs_wait}" = "" ] && ZFS_WAIT="15" || ZFS_WAIT="${zfs_wait}"
case ${root} in
# root=zfs
"zfs")
mount_handler="zfs_mount_handler"
;;
# root=ZFS=... syntax (grub)
"ZFS="*)
mount_handler="zfs_mount_handler"
ZFS_DATASET="${root#*[=]}"
;;
esac
case ${zfs} in
"")
# skip this line/dataset
;;
auto|bootfs)
ZFS_DATASET="bootfs"
mount_handler="zfs_mount_handler"
local pool="[a-zA-Z][^ ]*"
;;
*)
ZFS_DATASET="${zfs}"
mount_handler="zfs_mount_handler"
local pool="${ZFS_DATASET%%/*}"
;;
esac
# Allow at least n seconds for zfs device to show up. Especially
# when using zfs_import_dir instead of zpool.cache, the listing of
# available pools can be slow, so this loop must be top-tested to
# ensure we do one 'zpool import' pass after the timer has expired.
sleep ${ZFS_WAIT} & pid=$!
local break_after=0
while :; do
kill -0 $pid > /dev/null 2>&1 || break_after=1
if [ -c "/dev/zfs" ]; then
zpool import ${ZPOOL_IMPORT_FLAGS} | awk "
BEGIN { pool_found=0; online=0; unavail=0 }
/^ ${pool} .*/ { pool_found=1 }
/^\$/ { pool_found=0 }
/UNAVAIL/ { if (pool_found == 1) { unavail=1 } }
/ONLINE/ { if (pool_found == 1) { online=1 } }
END { if (online == 1 && unavail != 1)
{ exit 0 }
else
{ exit 1 }
}" && break
fi
[ $break_after == 1 ] && break
sleep 1
done
kill $pid > /dev/null 2>&1
}
run_latehook () {
set_flags
# only run zpool import, if flags were set (cache file found / zfs_import_dir specified) and zfs_boot_only is not set
[ ! "${ZPOOL_IMPORT_FLAGS}" = "" ] && [ "${ZFS_BOOT_ONLY}" = "" ] && zpool import ${ZPOOL_IMPORT_FLAGS} -N -a ${ZPOOL_FORCE}
}
# vim:set ts=4 sw=4 ft=sh et: