scripts/boot/swapon.sh

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