contrib/dracut/02zfsexpandknowledge/module-setup.sh.in

   1 #!/usr/bin/env bash
   2
   3 get_devtype() {
   4   local typ
   5   typ=$(udevadm info --query=property --name="$1" | sed -n 's|^ID_FS_TYPE=||p')
   6   if [ -z "$typ" ] ; then
   7      typ=$(blkid -c /dev/null "$1" -o value -s TYPE)
   8   fi
   9   echo "$typ"
  10 }
  11
  12 get_pool_devices() {
  13   # also present in 99zfssystemd
  14   local poolconfigtemp
  15   local poolconfigoutput
  16   local pooldev
  17   local resolved
  18   poolconfigtemp="$(mktemp)"
  19   if ! @sbindir@/zpool list -v -H -P "$1" > "$poolconfigtemp" 2>&1 ; then
  20     poolconfigoutput="$(cat "$poolconfigtemp")"
  21     dinfo "zfsexpandknowledge: pool $1 cannot be listed: $poolconfigoutput"
  22   else
  23     awk -F '\t' '/\t\/dev/ { print $2 }' "$poolconfigtemp" | \
  24     while read -r pooldev ; do
  25         if [ -e "$pooldev" ] ; then
  26           resolved="$(readlink -f "$pooldev")"
  27           dinfo "zfsexpandknowledge: pool $1 has device $pooldev (which resolves to $resolved)"
  28           echo "$resolved"
  29         fi
  30     done
  31   fi
  32   rm -f "$poolconfigtemp"
  33 }
  34
  35 find_zfs_block_devices() {
  36     local dev
  37     local mp
  38     local fstype
  39     local _
  40     numfields="$(awk '{print NF; exit}' /proc/self/mountinfo)"
  41     if [ "$numfields" = "10" ] ; then
  42         fields="_ _ _ _ mp _ _ fstype dev _"
  43     else
  44         fields="_ _ _ _ mp _ _ _ fstype dev _"
  45     fi
  46     # shellcheck disable=SC2086
  47     while read -r ${fields?} ; do
  48        [ "$fstype" = "zfs" ] || continue
  49        [ "$mp" = "$1" ] && get_pool_devices "${dev%%/*}"
  50     done < /proc/self/mountinfo
  51 }
  52
  53 array_contains () {
  54   local e
  55   for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
  56   return 1
  57 }
  58
  59 check() {
  60     # https://github.com/dracutdevs/dracut/pull/1711 provides a zfs_devs
  61     # function to detect the physical devices backing zfs pools. If this
  62     # function exists in the version of dracut this module is being called
  63     # from, then it does not need to run.
  64     type zfs_devs >/dev/null 2>&1 && return 1
  65
  66     local mp
  67     local dev
  68     local blockdevs
  69     local fstype
  70     local majmin
  71     local _depdev
  72     local _depdevname
  73     local _depdevtype
  74
  75 # shellcheck disable=SC2154
  76 if [ -n "$hostonly" ]; then
  77
  78     for mp in \
  79         "/" \
  80         "/etc" \
  81         "/bin" \
  82         "/sbin" \
  83         "/lib" \
  84         "/lib64" \
  85         "/usr" \
  86         "/usr/bin" \
  87         "/usr/sbin" \
  88         "/usr/lib" \
  89         "/usr/lib64" \
  90         "/boot";
  91     do
  92         mp=$(readlink -f "$mp")
  93         mountpoint "$mp" >/dev/null 2>&1 || continue
  94         blockdevs=$(find_zfs_block_devices "$mp")
  95         if [ -z "$blockdevs" ] ; then continue ; fi
  96         dinfo "zfsexpandknowledge: block devices backing ZFS dataset $mp: ${blockdevs//$'\n'/ }"
  97         for dev in $blockdevs
  98         do
  99             array_contains "$dev" "${host_devs[@]}" || host_devs+=("$dev")
 100             fstype=$(get_devtype "$dev")
 101             host_fs_types["$dev"]="$fstype"
 102             majmin=$(get_maj_min "$dev")
 103             if [ -d "/sys/dev/block/$majmin/slaves" ] ; then
 104                 for _depdev in "/sys/dev/block/$majmin/slaves"/*; do
 105                     [ -f "$_depdev/dev" ] || continue
 106                     _depdev="/dev/${_depdev##*/}"
 107                     _depdevname=$(udevadm info --query=property --name="$_depdev" | sed -n 's|^DEVNAME=||p')
 108                     _depdevtype=$(get_devtype "$_depdevname")
 109                     dinfo "zfsexpandknowledge: underlying block device backing ZFS dataset $mp: ${_depdevname//$'\n'/ }"
 110                     array_contains "$_depdevname" "${host_devs[@]}" || host_devs+=("$_depdevname")
 111                     host_fs_types["$_depdevname"]="$_depdevtype"
 112                 done
 113             fi
 114         done
 115     done
 116     for a in "${host_devs[@]}"
 117         do
 118         dinfo "zfsexpandknowledge: host device $a"
 119     done
 120     for a in "${!host_fs_types[@]}"
 121         do
 122         dinfo "zfsexpandknowledge: device $a of type ${host_fs_types[$a]}"
 123     done
 124
 125 fi
 126
 127 return 1
 128 }