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contrib; dracut: centralise root= parsing, actually support root=s
So far, everything parsed root= manually, which meant that while zfs-parse.sh was updated, and supposedly supported + -> ' ' conversion, it meant nothing Instead, centralise parsing, and allow: root= root=zfs root=zfs: root=zfs:AUTO root=ZFS=data/set root=zfs:data/set root=zfs:ZFS=data/set (as a side-effect; allowed but undocumented) rootfstype=zfs AND root=data/set <=> root=data/set rootfstype=zfs AND root= <=> root=zfs:AUTO So rootfstype=zfs /also/ behaves as expected, and + decoding works Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #13291
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Brian Behlendorf
parent
2c74617bcf
commit
245529d85f
@ -3,34 +3,20 @@
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. /lib/dracut-zfs-lib.sh
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ZFS_DATASET=""
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ZFS_POOL=""
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case "${root}" in
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zfs:*) ;;
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*) return ;;
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esac
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decode_root_args || return 0
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GENERATOR_FILE=/run/systemd/generator/sysroot.mount
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GENERATOR_EXTENSION=/run/systemd/generator/sysroot.mount.d/zfs-enhancement.conf
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if [ -e "$GENERATOR_FILE" ] && [ -e "$GENERATOR_EXTENSION" ] ; then
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# If the ZFS sysroot.mount flag exists, the initial RAM disk configured
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# it to mount ZFS on root. In that case, we bail early. This flag
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# file gets created by the zfs-generator program upon successful run.
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info "ZFS: There is a sysroot.mount and zfs-generator has extended it."
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info "ZFS: Delegating root mount to sysroot.mount."
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# Let us tell the initrd to run on shutdown.
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# We have a shutdown hook to run
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# because we imported the pool.
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if [ -e "$GENERATOR_FILE" ] && [ -e "$GENERATOR_EXTENSION" ]; then
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# We're under systemd and dracut-zfs-generator ran to completion.
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info "ZFS: Delegating root mount to sysroot.mount at al."
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# We now prevent Dracut from running this thing again.
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for zfsmounthook in "$hookdir"/mount/*zfs* ; do
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if [ -f "$zfsmounthook" ] ; then
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rm -f "$zfsmounthook"
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fi
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done
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rm -f "$hookdir"/mount/*zfs*
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return
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fi
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info "ZFS: No sysroot.mount exists or zfs-generator did not extend it."
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info "ZFS: Mounting root with the traditional mount-zfs.sh instead."
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@ -38,6 +24,9 @@ info "ZFS: Mounting root with the traditional mount-zfs.sh instead."
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modprobe zfs 2>/dev/null
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udevadm settle
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ZFS_DATASET=
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ZFS_POOL=
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if [ "${root}" = "zfs:AUTO" ] ; then
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if ! ZFS_DATASET="$(find_bootfs)" ; then
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# shellcheck disable=SC2086
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@ -53,7 +42,7 @@ if [ "${root}" = "zfs:AUTO" ] ; then
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info "ZFS: Using ${ZFS_DATASET} as root."
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fi
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ZFS_DATASET="${ZFS_DATASET:-${root#zfs:}}"
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ZFS_DATASET="${ZFS_DATASET:-${root}}"
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ZFS_POOL="${ZFS_DATASET%%/*}"
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if import_pool "${ZFS_POOL}" ; then
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@ -1,7 +1,8 @@
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#!/bin/sh
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# shellcheck disable=SC2034,SC2154
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. /lib/dracut-lib.sh
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# shellcheck source=zfs-lib.sh.in
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. /lib/dracut-zfs-lib.sh
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# Let the command line override our host id.
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spl_hostid=$(getarg spl_hostid=)
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@ -15,46 +16,20 @@ else
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warn "ZFS: Pools may not import correctly."
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fi
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wait_for_zfs=0
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case "${root}" in
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""|zfs|zfs:)
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# We'll take root unset, root=zfs, or root=zfs:
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# No root set, so we want to read the bootfs attribute. We
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# can't do that until udev settles so we'll set dummy values
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# and hope for the best later on.
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root="zfs:AUTO"
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rootok=1
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wait_for_zfs=1
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if decode_root_args; then
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if [ "$root" = "zfs:AUTO" ]; then
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info "ZFS: Boot dataset autodetected from bootfs=."
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else
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info "ZFS: Boot dataset is ${root}."
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fi
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info "ZFS: Enabling autodetection of bootfs after udev settles."
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;;
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ZFS=*|zfs:*)
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# root is explicit ZFS root. Parse it now. We can handle
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# a root=... param in any of the following formats:
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# root=ZFS=rpool/ROOT
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# root=zfs:rpool/ROOT
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# root=ZFS=pool+with+space/ROOT+WITH+SPACE (translates to root=ZFS=pool with space/ROOT WITH SPACE)
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# Strip down to just the pool/fs
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root="${root#zfs:}"
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root="zfs:${root#ZFS=}"
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# switch + with spaces because kernel cmdline does not allow us to quote parameters
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root=$(echo "$root" | tr '+' ' ')
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rootok=1
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wait_for_zfs=1
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info "ZFS: Set ${root} as bootfs."
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;;
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*)
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info "ZFS: no ZFS-on-root"
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esac
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# Make sure Dracut is happy that we have a root and will wait for ZFS
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# modules to settle before mounting.
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if [ "${wait_for_zfs}" -eq 1 ]; then
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ln -s /dev/null /dev/root 2>/dev/null
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initqueuedir="${hookdir}/initqueue/finished"
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echo '[ -e /dev/zfs ]' > "${initqueuedir}/zfs.sh"
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rootok=1
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# Make sure Dracut is happy that we have a root and will wait for ZFS
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# modules to settle before mounting.
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if [ -n "${wait_for_zfs}" ]; then
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ln -s null /dev/root
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echo '[ -e /dev/zfs ]' > "${hookdir}/initqueue/finished/zfs.sh"
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fi
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else
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info "ZFS: no ZFS-on-root."
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fi
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@ -1,5 +1,5 @@
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#!/bin/sh
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# shellcheck disable=SC2016,SC1004
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# shellcheck disable=SC2016,SC1004,SC2154
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grep -wq debug /proc/cmdline && debug=1
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[ -n "$debug" ] && echo "zfs-generator: starting" >> /dev/kmsg
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@ -10,37 +10,17 @@ GENERATOR_DIR="$1"
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exit 1
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}
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[ -f /lib/dracut-lib.sh ] && dracutlib=/lib/dracut-lib.sh
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[ -f /usr/lib/dracut/modules.d/99base/dracut-lib.sh ] && dracutlib=/usr/lib/dracut/modules.d/99base/dracut-lib.sh
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command -v getarg >/dev/null 2>&1 || {
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[ -n "$debug" ] && echo "zfs-generator: loading Dracut library from $dracutlib" >> /dev/kmsg
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. "$dracutlib"
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}
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# shellcheck source=zfs-lib.sh.in
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. /lib/dracut-zfs-lib.sh
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decode_root_args || exit 0
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[ -z "$root" ] && root=$(getarg root=)
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[ -z "$rootfstype" ] && rootfstype=$(getarg rootfstype=)
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[ -z "$rootflags" ] && rootflags=$(getarg rootflags=)
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# If root is not ZFS= or zfs: or rootfstype is not zfs
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# then we are not supposed to handle it.
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[ "${root##zfs:}" = "${root}" ] &&
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[ "${root##ZFS=}" = "${root}" ] &&
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[ "$rootfstype" != "zfs" ] &&
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exit 0
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[ -z "${rootflags}" ] && rootflags=$(getarg rootflags=)
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case ",${rootflags}," in
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*,zfsutil,*) ;;
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,,) rootflags=zfsutil ;;
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*) rootflags="zfsutil,${rootflags}" ;;
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esac
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if [ "${root}" != "zfs:AUTO" ]; then
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root="${root##zfs:}"
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root="${root##ZFS=}"
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fi
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[ -n "$debug" ] && echo "zfs-generator: writing extension for sysroot.mount to $GENERATOR_DIR/sysroot.mount.d/zfs-enhancement.conf" >> /dev/kmsg
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@ -89,7 +69,7 @@ else
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_zfs_generator_cb() {
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dset="${1}"
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mpnt="${2}"
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unit="sysroot$(echo "$mpnt" | tr '/' '-').mount"
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unit="$(systemd-escape --suffix=mount -p "/sysroot${mpnt}")"
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{
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echo "[Unit]"
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@ -1,6 +1,6 @@
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#!/bin/sh
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command -v getarg >/dev/null || . /lib/dracut-lib.sh
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command -v getarg >/dev/null || . /lib/dracut-lib.sh || . /usr/lib/dracut/modules.d/99base/dracut-lib.sh
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command -v getargbool >/dev/null || {
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# Compatibility with older Dracut versions.
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# With apologies to the Dracut developers.
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@ -161,7 +161,9 @@ ask_for_password() {
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shift
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done
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{ flock -s 9;
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{
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flock -s 9
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# Prompt for password with plymouth, if installed and running.
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if plymouth --ping 2>/dev/null; then
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plymouth ask-for-password \
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@ -191,3 +193,58 @@ ask_for_password() {
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[ "$ret" -ne 0 ] && echo "Wrong password" >&2
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return "$ret"
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}
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# Parse root=, rootfstype=, return them decoded and normalised to zfs:AUTO for auto, plain dset for explicit
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#
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# True if ZFS-on-root, false if we shouldn't
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#
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# Supported values:
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# root=
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# root=zfs
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# root=zfs:
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# root=zfs:AUTO
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#
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# root=ZFS=data/set
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# root=zfs:data/set
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# root=zfs:ZFS=data/set (as a side-effect; allowed but undocumented)
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#
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# rootfstype=zfs AND root=data/set <=> root=data/set
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# rootfstype=zfs AND root= <=> root=zfs:AUTO
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#
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# '+'es in explicit dataset decoded to ' 's.
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decode_root_args() {
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if [ -n "$rootfstype" ]; then
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[ "$rootfstype" = zfs ]
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return
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fi
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root=$(getarg root=)
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rootfstype=$(getarg rootfstype=)
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# shellcheck disable=SC2249
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case "$root" in
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""|zfs|zfs:|zfs:AUTO)
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root=zfs:AUTO
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rootfstype=zfs
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return 0
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;;
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ZFS=*|zfs:*)
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root="${root#zfs:}"
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root="${root#ZFS=}"
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root=$(echo "$root" | tr '+' ' ')
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rootfstype=zfs
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return 0
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;;
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esac
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if [ "$rootfstype" = "zfs" ]; then
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case "$root" in
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"") root=zfs:AUTO ;;
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*) root=$(echo "$root" | tr '+' ' ') ;;
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esac
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return 0
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fi
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return 1
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}
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@ -4,32 +4,20 @@
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# only run this on systemd systems, we handle the decrypt in mount-zfs.sh in the mount hook otherwise
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[ -e /bin/systemctl ] || [ -e /usr/bin/systemctl ] || return 0
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# This script only gets executed on systemd systems, see mount-zfs.sh for non-systemd systems
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# shellcheck source=zfs-lib.sh.in
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. /lib/dracut-zfs-lib.sh
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# import the libs now that we know the pool imported
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[ -f /lib/dracut-lib.sh ] && dracutlib=/lib/dracut-lib.sh
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[ -f /usr/lib/dracut/modules.d/99base/dracut-lib.sh ] && dracutlib=/usr/lib/dracut/modules.d/99base/dracut-lib.sh
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# shellcheck source=./lib-zfs.sh.in
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. "$dracutlib"
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# load the kernel command line vars
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[ -z "$root" ] && root="$(getarg root=)"
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# If root is not ZFS= or zfs: or rootfstype is not zfs then we are not supposed to handle it.
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[ "${root##zfs:}" = "${root}" ] && [ "${root##ZFS=}" = "${root}" ] && [ "$rootfstype" != "zfs" ] && exit 0
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decode_root_args || return 0
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# There is a race between the zpool import and the pre-mount hooks, so we wait for a pool to be imported
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while [ "$(zpool list -H)" = "" ]; do
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systemctl is-failed --quiet zfs-import-cache.service zfs-import-scan.service && exit 1
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while ! systemctl is-active --quiet zfs-import.target; do
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systemctl is-failed --quiet zfs-import-cache.service zfs-import-scan.service && return 1
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sleep 0.1s
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done
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# run this after import as zfs-import-cache/scan service is confirmed good
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# we do not overwrite the ${root} variable, but create a new one, BOOTFS, to hold the dataset
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if [ "${root}" = "zfs:AUTO" ] ; then
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BOOTFS="$(zpool list -H -o bootfs | awk '$1 != "-" {print; exit}')"
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else
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BOOTFS="${root##zfs:}"
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BOOTFS="${BOOTFS##ZFS=}"
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BOOTFS="$root"
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if [ "$BOOTFS" = "zfs:AUTO" ]; then
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BOOTFS="$(zpool get -Ho value bootfs | grep -m1 -vFx -)"
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fi
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# if pool encryption is active and the zfs command understands '-o encryption'
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@ -16,18 +16,18 @@ Encrypted datasets have keys loaded automatically or prompted for.
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If the root dataset contains children with `mountpoint=`s of `/etc`, `/bin`, `/lib*`, or `/usr`, they're mounted too.
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## cmdline
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1. `root=` | Root dataset is… | Pools imported |
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-------------------|----------------------------------------------------------|----------------|
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*(empty)* | the first `bootfs=` after `zpool import -aN` | all |
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`zfs:AUTO` | *(as above, but overriding other autoselection methods)* | all |
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`ZFS=pool/dataset` | `pool/dataset` | `pool` |
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`zfs:pool/dataset` | *(as above)* | `pool` |
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1. `root=` | Root dataset is… |
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---------------------------|----------------------------------------------------------|
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*(empty)* | the first `bootfs=` after `zpool import -aN` |
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`zfs:AUTO`, `zfs:`, `zfs` | *(as above, but overriding other autoselection methods)* |
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`ZFS=pool/dataset` | `pool/dataset` |
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`zfs:pool/dataset` | *(as above)* |
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All `+`es are replaced with spaces (i.e. to boot from `root pool/data set`, pass `root=zfs:root+pool/data+set`).
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The dataset can be at any depth, including being the pool's root dataset (i.e. `root=zfs:pool`).
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`rootfstype=zfs` is mostly equivalent to `root=zfs:AUTO`.
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`rootfstype=zfs` is equivalent to `root=zfs:AUTO`, `rootfstype=zfs root=pool/dataset` is equivalent to `root=zfs:pool/dataset`.
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2. `spl_hostid`: passed to `zgenhostid -f`, useful to override the `/etc/hostid` file baked into the initrd.
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