components/3020-swap

   1 #!/bin/sh
   2
   3 #set -e
   4
   5 Swap ()
   6 {
   7         for _PARAMETER in ${LIVE_BOOT_CMDLINE}
   8         do
   9                 case "${_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         for _DEVICE in $(echo ${LIVE_SWAP_DEVICES} | sed -e 's|,| |g')
  33         do
  34                 if [ ! -b "${_DEVICE}" ]
  35                 then
  36                         continue
  37                 fi
  38
  39                 blkid -o udev -p ${_DEVICE%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue
  40
  41                 _MAGIC="$(/bin/dd if=${_DEVICE} bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null)" || continue
  42
  43                 case "${_MAGIC}" in
  44                         SWAPSPACE2|SWAP-SPACE)
  45                                 _SWAP_DEVICES="${_SWAP_DEVICES} ${_DEVICE}"
  46                                 ;;
  47                 esac
  48         done
  49
  50         # Remove all auto swap entries
  51         if grep -qs "swap swap" /root/etc/fstab
  52         then
  53                 grep -v "swap swap" /root/etc/fstab > /root/etc/fstab.tmp
  54                 mv /root/etc/fstab.tmp /root/etc/fstab
  55         fi
  56
  57         # Add new swap entries
  58         for _DEVICE in ${_SWAP_DEVICES}
  59         do
  60                 echo "${_DEVICE} swap swap defaults 0 0" >> /root/etc/fstab
  61         done
  62 }