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#!/bin/sh
# shellcheck disable=SC2154
# only run this on systemd systems, we handle the decrypt in mount-zfs.sh in the mount hook otherwise
[ -e /bin/systemctl ] || [ -e /usr/bin/systemctl ] || return 0
# This script only gets executed on systemd systems, see mount-zfs.sh for non-systemd systems
# import the libs now that we know the pool imported
[ -f /lib/dracut-lib.sh ] && dracutlib=/lib/dracut-lib.sh
[ -f /usr/lib/dracut/modules.d/99base/dracut-lib.sh ] && dracutlib=/usr/lib/dracut/modules.d/99base/dracut-lib.sh
# shellcheck source=./lib-zfs.sh.in
. "$dracutlib"
# load the kernel command line vars
[ -z "$root" ] && root="$(getarg root=)"
# If root is not ZFS= or zfs: or rootfstype is not zfs then we are not supposed to handle it.
[ "${root##zfs:}" = "${root}" ] && [ "${root##ZFS=}" = "${root}" ] && [ "$rootfstype" != "zfs" ] && exit 0
# There is a race between the zpool import and the pre-mount hooks, so we wait for a pool to be imported
while [ "$(zpool list -H)" = "" ]; do
systemctl is-failed --quiet zfs-import-cache.service zfs-import-scan.service && exit 1
sleep 0.1s
done
# run this after import as zfs-import-cache/scan service is confirmed good
# we do not overwrite the ${root} variable, but create a new one, BOOTFS, to hold the dataset
if [ "${root}" = "zfs:AUTO" ] ; then
BOOTFS="$(zpool list -H -o bootfs | awk '$1 != "-" {print; exit}')"
else
BOOTFS="${root##zfs:}"
BOOTFS="${BOOTFS##ZFS=}"
fi
# if pool encryption is active and the zfs command understands '-o encryption'
if [ "$(zpool list -H -o feature@encryption "$(echo "${BOOTFS}" | awk -F/ '{print $1}')")" = 'active' ]; then
# if the root dataset has encryption enabled
ENCRYPTIONROOT="$(zfs get -H -o value encryptionroot "${BOOTFS}")"
# where the key is stored (in a file or loaded via prompt)
KEYLOCATION="$(zfs get -H -o value keylocation "${ENCRYPTIONROOT}")"
if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
KEYSTATUS="$(zfs get -H -o value keystatus "${ENCRYPTIONROOT}")"
# continue only if the key needs to be loaded
[ "$KEYSTATUS" = "unavailable" ] || exit 0
# if key is stored in a file, do not prompt
if ! [ "${KEYLOCATION}" = "prompt" ]; then
zfs load-key "${ENCRYPTIONROOT}"
else
# decrypt them
TRY_COUNT=5
while [ $TRY_COUNT -gt 0 ]; do
systemd-ask-password "Encrypted ZFS password for ${BOOTFS}" --no-tty | zfs load-key "${ENCRYPTIONROOT}" && break
TRY_COUNT=$((TRY_COUNT - 1))
done
fi
fi
fi
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