cmd/zed/zed.d/history_event-zfs-list-cacher.sh.in

   1 #!/bin/sh
   2 # shellcheck disable=SC2154
   3 #
   4 # Track changes to enumerated pools for use in early-boot
   5 set -ef
   6
   7 FSLIST="@sysconfdir@/zfs/zfs-list.cache/${ZEVENT_POOL}"
   8 FSLIST_TMP="@runstatedir@/zfs-list.cache@${ZEVENT_POOL}"
   9
  10 # If the pool specific cache file is not writeable, abort
  11 [ -w "${FSLIST}" ] || exit 0
  12
  13 [ -f "${ZED_ZEDLET_DIR}/zed.rc" ] && . "${ZED_ZEDLET_DIR}/zed.rc"
  14 . "${ZED_ZEDLET_DIR}/zed-functions.sh"
  15
  16 [ "$ZEVENT_SUBCLASS" != "history_event" ] && exit 0
  17 zed_check_cmd "${ZFS}" sort diff
  18
  19 # If we are acting on a snapshot, we have nothing to do
  20 [ "${ZEVENT_HISTORY_DSNAME%@*}" = "${ZEVENT_HISTORY_DSNAME}" ] || exit 0
  21
  22 # We lock the output file to avoid simultaneous writes.
  23 # If we run into trouble, log and drop the lock
  24 abort_alter() {
  25   zed_log_msg "Error updating zfs-list.cache for ${ZEVENT_POOL}!"
  26   zed_unlock "${FSLIST}"
  27 }
  28
  29 finished() {
  30   zed_unlock "${FSLIST}"
  31   trap - EXIT
  32   exit 0
  33 }
  34
  35 case "${ZEVENT_HISTORY_INTERNAL_NAME}" in
  36     create|"finish receiving"|import|destroy|rename)
  37       ;;
  38
  39     export)
  40         zed_lock "${FSLIST}"
  41         trap abort_alter EXIT
  42         echo > "${FSLIST}"
  43         finished
  44       ;;
  45
  46     set|inherit)
  47         # Only act if one of the tracked properties is altered.
  48         case "${ZEVENT_HISTORY_INTERNAL_STR%%=*}" in
  49             canmount|mountpoint|atime|relatime|devices|exec|readonly| \
  50               setuid|nbmand|encroot|keylocation|org.openzfs.systemd:requires| \
  51               org.openzfs.systemd:requires-mounts-for| \
  52               org.openzfs.systemd:before|org.openzfs.systemd:after| \
  53               org.openzfs.systemd:wanted-by|org.openzfs.systemd:required-by| \
  54               org.openzfs.systemd:nofail|org.openzfs.systemd:ignore \
  55             ) ;;
  56             *) exit 0 ;;
  57         esac
  58       ;;
  59
  60     *)
  61         # Ignore all other events.
  62         exit 0
  63       ;;
  64 esac
  65
  66 zed_lock "${FSLIST}"
  67 trap abort_alter EXIT
  68
  69 PROPS="name,mountpoint,canmount,atime,relatime,devices,exec\
  70 ,readonly,setuid,nbmand,encroot,keylocation\
  71 ,org.openzfs.systemd:requires,org.openzfs.systemd:requires-mounts-for\
  72 ,org.openzfs.systemd:before,org.openzfs.systemd:after\
  73 ,org.openzfs.systemd:wanted-by,org.openzfs.systemd:required-by\
  74 ,org.openzfs.systemd:nofail,org.openzfs.systemd:ignore"
  75
  76 "${ZFS}" list -H -t filesystem -o "${PROPS}" -r "${ZEVENT_POOL}" > "${FSLIST_TMP}"
  77
  78 # Sort the output so that it is stable
  79 sort "${FSLIST_TMP}" -o "${FSLIST_TMP}"
  80
  81 # Don't modify the file if it hasn't changed
  82 diff -q "${FSLIST_TMP}" "${FSLIST}" || cat "${FSLIST_TMP}" > "${FSLIST}"
  83 rm -f "${FSLIST_TMP}"
  84
  85 finished