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="${_PARAMETER#*swap=}"
  13                                 ;;
  14
  15                         live-boot.swap|swap)
  16                                 LIVE_SWAP="true"
  17                                 ;;
  18                 esac
  19         done
  20
  21         case "${LIVE_SWAP}" in
  22                 true)
  23                         ;;
  24
  25                 *)
  26                         return 0
  27                         ;;
  28         esac
  29
  30         LIVE_SWAP_DEVICES="${LIVE_SWAP_DEVICES:-/dev/sd* /dev/vd*}"
  31
  32         if [ -e /root/etc/fstab.d ]
  33         then
  34                 # wheezy
  35                 _FSTAB="/root/etc/fstab.d/swap"
  36         else
  37                 # squeeze
  38                 _FSTAB="/root/etc/fstab"
  39         fi
  40
  41         for _DEVICE in $(echo ${LIVE_SWAP_DEVICES} | sed -e 's|,| |g')
  42         do
  43                 if [ ! -b "${_DEVICE}" ]
  44                 then
  45                         continue
  46                 fi
  47
  48                 blkid -o udev -p ${_DEVICE%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue
  49
  50                 _MAGIC="$(/bin/dd if=${_DEVICE} bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null)" || continue
  51
  52                 case "${_MAGIC}" in
  53                         SWAPSPACE2|SWAP-SPACE)
  54                                 _SWAP_DEVICES="${_SWAP_DEVICES} ${_DEVICE}"
  55                                 ;;
  56                 esac
  57         done
  58
  59         # Remove all auto swap entries
  60         if grep -qs "swap swap" "${_FSTAB}"
  61         then
  62                 grep -v "swap swap" "${_FSTAB}" > "${_FSTAB}".tmp
  63                 mv "${_FSTAB}".tmp "${_FSTAB}"
  64         fi
  65
  66         # Add new swap entries
  67         for _DEVICE in ${_SWAP_DEVICES}
  68         do
  69                 echo "${_DEVICE} swap swap defaults 0 0" >> "${_FSTAB}"
  70         done
  71 }