contrib/dracut/90zfs/zfs-lib.sh.in

   1 #!/bin/sh
   2 # shellcheck disable=SC2034
   3
   4 command -v getarg >/dev/null || . /lib/dracut-lib.sh || . /usr/lib/dracut/modules.d/99base/dracut-lib.sh
   5
   6 TAB="   "
   7
   8 ZPOOL_IMPORT_OPTS=
   9 if getargbool 0 zfs_force -y zfs.force -y zfsforce; then
  10     warn "ZFS: Will force-import pools if necessary."
  11     ZPOOL_IMPORT_OPTS=-f
  12 fi
  13
  14 _mount_dataset_cb() {
  15     # shellcheck disable=SC2154
  16     mount -o zfsutil -t zfs "${1}" "${NEWROOT}${2}"
  17 }
  18
  19 # mount_dataset DATASET
  20 #   mounts the given zfs dataset.
  21 mount_dataset() {
  22     dataset="${1}"
  23     mountpoint="$(zfs get -H -o value mountpoint "${dataset}")"
  24     ret=0
  25
  26     # We need zfsutil for non-legacy mounts and not for legacy mounts.
  27     if [ "${mountpoint}" = "legacy" ] ; then
  28         mount -t zfs "${dataset}" "${NEWROOT}" || ret=$?
  29     else
  30         mount -o zfsutil -t zfs "${dataset}" "${NEWROOT}" || ret=$?
  31
  32         if [ "$ret" = "0" ]; then
  33             for_relevant_root_children "${dataset}" _mount_dataset_cb || ret=$?
  34         fi
  35     fi
  36
  37     return "${ret}"
  38 }
  39
  40 # for_relevant_root_children DATASET EXEC
  41 #   Runs "EXEC dataset mountpoint" for all children of DATASET that are needed for system bringup
  42 #   Used by zfs-nonroot-necessities.service and friends, too!
  43 for_relevant_root_children() {
  44     dataset="${1}"
  45     exec="${2}"
  46
  47     zfs list -t filesystem -Ho name,mountpoint,canmount -r "${dataset}" |
  48         (
  49             _ret=0
  50             while IFS="${TAB}" read -r dataset mountpoint canmount; do
  51                 [ "$canmount" != "on" ] && continue
  52
  53                 case "$mountpoint" in
  54                     /etc|/bin|/lib|/lib??|/libx32|/usr)
  55                         # If these aren't mounted we may not be able to get to the real init at all, or pollute the dataset holding the rootfs
  56                         "${exec}" "${dataset}" "${mountpoint}" || _ret=$?
  57                         ;;
  58                     *)
  59                         # Up to the real init to remount everything else it might need
  60                         ;;
  61                 esac
  62             done
  63             exit "${_ret}"
  64         )
  65 }
  66
  67 # Parse root=, rootfstype=, return them decoded and normalised to zfs:AUTO for auto, plain dset for explicit
  68 #
  69 # True if ZFS-on-root, false if we shouldn't
  70 #
  71 # Supported values:
  72 #   root=
  73 #   root=zfs
  74 #   root=zfs:
  75 #   root=zfs:AUTO
  76 #
  77 #   root=ZFS=data/set
  78 #   root=zfs:data/set
  79 #   root=zfs:ZFS=data/set (as a side-effect; allowed but undocumented)
  80 #
  81 #   rootfstype=zfs AND root=data/set <=> root=data/set
  82 #   rootfstype=zfs AND root=         <=> root=zfs:AUTO
  83 #
  84 # '+'es in explicit dataset decoded to ' 's.
  85 decode_root_args() {
  86     if [ -n "$rootfstype" ]; then
  87         [ "$rootfstype" = zfs ]
  88         return
  89     fi
  90
  91     xroot=$(getarg root=)
  92     rootfstype=$(getarg rootfstype=)
  93
  94     # shellcheck disable=SC2249
  95     case "$xroot" in
  96         ""|zfs|zfs:|zfs:AUTO)
  97             root=zfs:AUTO
  98             rootfstype=zfs
  99             return 0
 100             ;;
 101
 102         ZFS=*|zfs:*)
 103             root="${xroot#zfs:}"
 104             root="${root#ZFS=}"
 105             root=$(echo "$root" | tr '+' ' ')
 106             rootfstype=zfs
 107             return 0
 108             ;;
 109     esac
 110
 111     if [ "$rootfstype" = "zfs" ]; then
 112         case "$xroot" in
 113             "") root=zfs:AUTO ;;
 114             *)  root=$(echo "$xroot" | tr '+' ' ') ;;
 115         esac
 116         return 0
 117     fi
 118
 119     return 1
 120 }