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zfs-mount-generator implements the "systemd generator" protocol, producing systemd.mount units from the cached outputs of zfs list, during early boot, integrating with systemd. Each pool has an indpendent cache of the command zfs list -H -oname,mountpoint,canmount -tfilesystem -r $pool which is kept synchronized by the ZEDLET history_event-zfs-list-cacher.sh Datasets not in the cache will be loaded later in the boot process by zfs-mount.service, including pools without a cache. Among other things, this allows for complex mount hierarchies. Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Antonio Russo <antonio.e.russo@gmail.com> Closes #7329
116 lines
3.4 KiB
Bash
Executable File
116 lines
3.4 KiB
Bash
Executable File
#!/bin/sh
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# zfs-mount-generator - generates systemd mount units for zfs
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# Copyright (c) 2017 Antonio Russo <antonio.e.russo@gmail.com>
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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set -ef
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FSLIST="@sysconfdir@/zfs/zfs-list.cache"
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[ -d "${FSLIST}" ] || exit 0
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do_fail() {
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printf 'zfs-mount-generator.sh: %s\n' "$*" > /dev/kmsg
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exit 1
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}
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# see systemd.generator
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if [ $# -eq 0 ] ; then
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dest_norm="/tmp"
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elif [ $# -eq 3 ] ; then
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dest_norm="${1}"
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else
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do_fail "zero or three arguments required"
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fi
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# For ZFSs marked "auto", a dependency is created for local-fs.target. To
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# avoid regressions, this dependency is reduced to "wants" rather than
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# "requires". **THIS MAY CHANGE**
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req_dir="${dest_norm}/local-fs.target.wants/"
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mkdir -p "${req_dir}"
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# All needed information about each ZFS is available from
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# zfs list -H -t filesystem -oname,mountpoint,canmount
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# cached in $FSLIST, and each line is processed by the following function:
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process_line() {
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# Check for canmount=off .
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if [ "${3}" = "off" ] ; then
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return
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elif [ "${3}" = "noauto" ] ; then
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# Don't let a noauto marked mountpoint block an "auto" market mountpoint
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return
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elif [ "${3}" = "on" ] ; then
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: # This is OK
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else
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do_fail "invalid canmount"
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fi
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# Check for legacy and blank mountpoints.
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if [ "${2}" = "legacy" ] ; then
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return
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elif [ "${2}" = "none" ] ; then
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return
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elif [ "${2%"${2#?}"}" != "/" ] ; then
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do_fail "invalid mountpoint $*"
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fi
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# Escape the mountpoint per systemd policy.
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mountfile="$(systemd-escape "${2#?}").mount"
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# If the mountpoint has already been created, give it precedence.
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if [ -e "${dest_norm}/${mountfile}" ] ; then
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printf 'zfs-mount-generator.sh: %s.mount already exists\n' "${2}" \
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>/dev/kmsg
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return
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fi
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# By ordering before zfs-mount.service, we avoid race conditions.
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cat > "${dest_norm}/${mountfile}" << EOF
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# Automatically generated by zfs-mount-generator
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[Unit]
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SourcePath=${FSLIST}/${cachefile}
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Documentation=man:zfs-mount-generator(8)
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Before=local-fs.target zfs-mount.service
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After=zfs-import.target
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Wants=zfs-import.target
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[Mount]
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Where=${2}
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What=${1}
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Type=zfs
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Options=zfsutil,auto
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EOF
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# Finally, create the appropriate dependencies based on the ZFS properties.
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[ "$3" = "on" ] & ln -s "../${mountfile}" "${req_dir}"
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}
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# Feed each line into process_line
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for cachefile in $(ls "${FSLIST}") ; do
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while read -r fs ; do
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process_line $fs
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done < "${FSLIST}/${cachefile}"
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done
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