contrib/dracut: 90: mount essential datasets under root
This partly mirrors what the i-t script does (though that mounts all children, recursively) ‒ /etc, /usr, /lib*, and /bin are all essential, if present, to successfully invoke the real init, which will then mount everything else it might need in the right order The following extreme-case set-up boots w/o issues now: / zoot zfs rw,relatime,xattr,noacl ├─/etc zoot/etc zfs rw,relatime,xattr,noacl ├─/usr zoot/usr zfs rw,relatime,xattr,noacl │ └─/usr/local zoot/usr/local zfs rw,relatime,xattr,noacl ├─/var zoot/var zfs rw,relatime,xattr,noacl │ ├─/var/lib zoot/var/lib zfs rw,relatime,xattr,noacl │ ├─/var/log zoot/var/log zfs rw,relatime,xattr,posixacl │ ├─/var/cache zoot/var/cache zfs rw,relatime,xattr,noacl │ └─/var/tmp zoot/var/tmp zfs rw,relatime,xattr,noacl ├─/home zoot/home zfs rw,relatime,xattr,noacl │ └─/home/nab zoot/home/nab zfs rw,relatime,xattr,noacl ├─/boot zoot/boot zfs rw,relatime,xattr,noacl ├─/root zoot/home/root zfs rw,relatime,xattr,noacl ├─/opt zoot/opt zfs rw,relatime,xattr,noacl └─/srv zoot/srv zfs rw,relatime,xattr,noacl Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11898
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Brian Behlendorf
parent
8d869cd840
commit
692387343f
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@ -11,12 +11,13 @@ GENERATOR_DIR="$1"
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[ -f /lib/dracut-lib.sh ] && dracutlib=/lib/dracut-lib.sh
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[ -f /usr/lib/dracut/modules.d/99base/dracut-lib.sh ] && dracutlib=/usr/lib/dracut/modules.d/99base/dracut-lib.sh
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command -v getarg >/dev/null 2>&1 || {
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[ -n "$debug" ] && echo "zfs-generator: loading Dracut library from $dracutlib" >> /dev/kmsg
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. "$dracutlib"
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}
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. /lib/dracut-zfs-lib.sh
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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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@ -28,40 +29,84 @@ command -v getarg >/dev/null 2>&1 || {
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[ "$rootfstype" != "zfs" ] &&
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exit 0
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rootfstype=zfs
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case ",${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 $GENERATOR_DIR/sysroot.mount.d/zfs-enhancement.conf" >> /dev/kmsg
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[ -d "$GENERATOR_DIR" ] || mkdir "$GENERATOR_DIR"
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[ -d "$GENERATOR_DIR"/sysroot.mount.d ] || mkdir "$GENERATOR_DIR"/sysroot.mount.d
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mkdir -p "$GENERATOR_DIR"/sysroot.mount.d "$GENERATOR_DIR"/initrd-root-fs.target.requires "$GENERATOR_DIR"/dracut-pre-mount.service.d
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{
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echo "[Unit]"
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echo "Before=initrd-root-fs.target"
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echo "After=zfs-import.target"
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echo
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echo "[Mount]"
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if [ "${root}" = "zfs:AUTO" ]; then
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echo "PassEnvironment=BOOTFS"
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echo 'What=${BOOTFS}'
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else
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root="${root##zfs:}"
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root="${root##ZFS=}"
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echo "What=${root}"
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fi
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echo "Type=${rootfstype}"
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echo "Type=zfs"
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echo "Options=${rootflags}"
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} > "$GENERATOR_DIR"/sysroot.mount.d/zfs-enhancement.conf
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[ -d "$GENERATOR_DIR"/initrd-root-fs.target.requires ] || mkdir -p "$GENERATOR_DIR"/initrd-root-fs.target.requires
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ln -s ../sysroot.mount "$GENERATOR_DIR"/initrd-root-fs.target.requires/sysroot.mount
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ln -fs ../sysroot.mount "$GENERATOR_DIR"/initrd-root-fs.target.requires/sysroot.mount
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[ -d "$GENERATOR_DIR"/dracut-pre-mount.service.d ] || mkdir "$GENERATOR_DIR"/dracut-pre-mount.service.d
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if [ "${root}" = "zfs:AUTO" ]; then
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{
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echo "[Unit]"
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echo "Before=initrd-root-fs.target"
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echo "After=sysroot.mount"
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echo "DefaultDependencies=no"
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echo
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echo "[Service]"
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echo "Type=oneshot"
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echo "PassEnvironment=BOOTFS"
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echo "ExecStart=/bin/sh -c '" ' \
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. /lib/dracut-zfs-lib.sh; \
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_zfs_nonroot_necessities_cb() { \
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zfs mount | grep -m1 -q "^$1 " && return 0; \
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echo "Mounting $1 on /sysroot$2"; \
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mount -o zfsutil -t zfs "$1" "/sysroot$2"; \
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}; \
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for_relevant_root_children "${BOOTFS}" _zfs_nonroot_necessities_cb;' \
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"'"
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} > "$GENERATOR_DIR"/zfs-nonroot-necessities.service
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ln -fs ../zfs-nonroot-necessities.service "$GENERATOR_DIR"/initrd-root-fs.target.requires/zfs-nonroot-necessities.service
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else
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# We can solve this statically at generation time, so do!
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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" | sed 's;/;-;g').mount"
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{
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echo "[Unit]"
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echo "Before=initrd-root-fs.target"
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echo "After=sysroot.mount"
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echo
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echo "[Mount]"
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echo "Where=/sysroot${mpnt}"
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echo "What=${dset}"
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echo "Type=zfs"
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echo "Options=zfsutil"
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} > "$GENERATOR_DIR/${unit}"
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ln -fs ../"${unit}" "$GENERATOR_DIR"/initrd-root-fs.target.requires/"${unit}"
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}
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for_relevant_root_children "${root}" _zfs_generator_cb
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fi
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{
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echo "[Unit]"
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@ -23,6 +23,7 @@ command -v getargbool >/dev/null || {
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OLDIFS="${IFS}"
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NEWLINE="
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"
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TAB=" "
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ZPOOL_IMPORT_OPTS=""
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if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
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@ -71,20 +72,56 @@ import_pool() {
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return 0
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}
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_mount_dataset_cb() {
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mount -o zfsutil -t zfs "${1}" "${NEWROOT}${2}"
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}
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# mount_dataset DATASET
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# mounts the given zfs dataset.
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mount_dataset() {
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dataset="${1}"
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mountpoint="$(zfs get -H -o value mountpoint "${dataset}")"
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ret=0
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# We need zfsutil for non-legacy mounts and not for legacy mounts.
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if [ "${mountpoint}" = "legacy" ] ; then
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mount -t zfs "${dataset}" "${NEWROOT}"
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mount -t zfs "${dataset}" "${NEWROOT}" || ret=$?
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else
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mount -o zfsutil -t zfs "${dataset}" "${NEWROOT}"
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mount -o zfsutil -t zfs "${dataset}" "${NEWROOT}" || ret=$?
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if [ "$ret" = "0" ]; then
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for_relevant_root_children "${dataset}" _mount_dataset_cb || ret=$?
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fi
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fi
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return $?
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return ${ret}
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}
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# for_relevant_root_children DATASET EXEC
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# Runs "EXEC dataset mountpoint" for all children of DATASET that are needed for system bringup
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# Used by zfs-generator.sh and friends, too!
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for_relevant_root_children() {
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dataset="${1}"
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exec="${2}"
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zfs list -t filesystem -Ho name,mountpoint,canmount -r "${dataset}" |
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(
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_ret=0
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while IFS="${TAB}" read -r dataset mountpoint canmount; do
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[ "$canmount" != "on" ] && continue
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case "$mountpoint" in
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/etc|/bin|/lib|/lib??|/libx32|/usr)
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# If these aren't mounted we may not be able to get to the real init at all, or pollute the dataset holding the rootfs
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"${exec}" "${dataset}" "${mountpoint}" || _ret=$?
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;;
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*)
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# Up to the real init to remount everything else it might need
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;;
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esac
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done
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exit ${_ret}
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)
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}
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# export_all OPTS
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