scripts/boot/3020-swapon

   1 #!/bin/sh
   2
   3 #set -e
   4
   5 Swapon ()
   6 {
   7         if [ "${LIVE_SWAPON}" != "true" ]
   8         then
   9                 return 0
  10         fi
  11
  12         LIVE_SWAPON_DEVICES="${LIVE_SWAPON_DEVICES:-/dev/sd* /dev/vd*}"
  13
  14         if [ -e /run ]
  15         then
  16                 # wheezy
  17                 _FSTAB="/root/etc/fstab.d/swap"
  18         else
  19                 # squeeze
  20                 _FSTAB="/root/etc/fstab"
  21         fi
  22
  23         for _DEVICE in $(echo ${LIVE_SWAPON_DEVICES} | sed -e 's|,| |g')
  24         do
  25                 if [ ! -b "${_DEVICE}" ]
  26                 then
  27                         continue
  28                 fi
  29
  30                 blkid -o udev -p ${_DEVICE%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue
  31
  32                 _MAGIC="$(/bin/dd if=${_DEVICE} bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null)" || continue
  33
  34                 case "${_MAGIC}" in
  35                         SWAPSPACE2|SWAP-SPACE)
  36                                 _SWAP_DEVICES="${_SWAP_DEVICES} ${_DEVICE}"
  37                                 ;;
  38                 esac
  39         done
  40
  41         # Remove all auto swap entries
  42         if grep -qs "swap swap" "${_FSTAB}"
  43         then
  44                 grep -v "swap swap" "${_FSTAB}" > "${_FSTAB}".tmp
  45                 mv "${_FSTAB}".tmp "${_FSTAB}"
  46         fi
  47
  48         # Add new swap entries
  49         for _DEVICE in ${_SWAP_DEVICES}
  50         do
  51                 echo "${_DEVICE} swap swap defaults 0 0" >> "${_FSTAB}"
  52         done
  53 }