116 lines
3.4 KiB
Plaintext
116 lines
3.4 KiB
Plaintext
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#!/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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