scripts/boot/3020-swapon

   1 #!/bin/sh
   2
   3 #set -e
   4
   5 Swap ()
   6 {
   7         for _PARAMETER in ${_CMDLINE}
   8         do
   9                 case "${_PARAMETER}" in
  10                         live-boot.swap=*|swap=*)
  11                                 LIVE_SWAP="true"
  12                                 LIVE_SWAP_DEVICES="${_PARAMETER#*swap=}"
  13                                 ;;
  14
  15                         live-boot.swap|swap)
  16                                 LIVE_SWAP="true"
  17                                 ;;
  18                 esac
  19         done
  20
  21         if [ "${LIVE_SWAP}" != "true" ]
  22         then
  23                 return 0
  24         fi
  25
  26         LIVE_SWAP_DEVICES="${LIVE_SWAP_DEVICES:-/dev/sd* /dev/vd*}"
  27
  28         if [ -e /run ]
  29         then
  30                 # wheezy
  31                 _FSTAB="/root/etc/fstab.d/swap"
  32         else
  33                 # squeeze
  34                 _FSTAB="/root/etc/fstab"
  35         fi
  36
  37         for _DEVICE in $(echo ${LIVE_SWAP_DEVICES} | sed -e 's|,| |g')
  38         do
  39                 if [ ! -b "${_DEVICE}" ]
  40                 then
  41                         continue
  42                 fi
  43
  44                 blkid -o udev -p ${_DEVICE%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue
  45
  46                 _MAGIC="$(/bin/dd if=${_DEVICE} bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null)" || continue
  47
  48                 case "${_MAGIC}" in
  49                         SWAPSPACE2|SWAP-SPACE)
  50                                 _SWAP_DEVICES="${_SWAP_DEVICES} ${_DEVICE}"
  51                                 ;;
  52                 esac
  53         done
  54
  55         # Remove all auto swap entries
  56         if grep -qs "swap swap" "${_FSTAB}"
  57         then
  58                 grep -v "swap swap" "${_FSTAB}" > "${_FSTAB}".tmp
  59                 mv "${_FSTAB}".tmp "${_FSTAB}"
  60         fi
  61
  62         # Add new swap entries
  63         for _DEVICE in ${_SWAP_DEVICES}
  64         do
  65                 echo "${_DEVICE} swap swap defaults 0 0" >> "${_FSTAB}"
  66         done
  67 }