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Text File  |  2012-06-28  |  2.3 KB  |  101 lines
  1. #!/bin/sh
  2.  
  3. # File: live-swapfile - create and use a swap file
  4. # Copyright: (C) 2009 Daniel Baumann <daniel@debian.org>
  5. # License: GPL-3+
  6.  
  7. set -e
  8.  
  9. # Options
  10. _SWAP_DIRECTORY="${_SWAP_DIRECTORY:-/live/swap}"
  11. _SWAP_FILE="${_SWAP_FILE:-swapfile.img}"
  12.  
  13. _SWAP_SIZE="${_SWAP_SIZE:-auto}"
  14. _SWAP_FACTOR="${_SWAP_FACTOR:-2}"
  15.  
  16. _SWAP_PURGE="${_SWAP_PURGE:-true}"
  17. _FORCE="${_FORCE:-true}"
  18.  
  19. case "${1}" in
  20.     add)
  21.         # Reading size of physical memory
  22.         _MEM_TOTAL_KB="$(awk '/^MemTotal: / { print $2 }' /proc/meminfo)"
  23.         _MEM_TOTAL_MB="$(expr ${_MEM_TOTAL_KB} / 1024)"
  24.  
  25.         echo "Found ${_MEM_TOTAL_MB} MB physical memory."
  26.  
  27.         # Setting size of new swapfile
  28.         if [ -z "${_SWAP_SIZE}" ] || [ "${_SWAP_SIZE}" = "auto" ]
  29.         then
  30.             _SWAP_SIZE_KB="$(expr ${_MEM_TOTAL_KB} '*' ${_SWAP_FACTOR})"
  31.             _SWAP_SIZE_MB="$(expr ${_SWAP_SIZE_KB} / 1024)"
  32.         else
  33.             _SWAP_SIZE_MB="${_SWAP_SIZE}"
  34.         fi
  35.  
  36.         echo "Requesting ${_SWAP_SIZE_MB} MB swapfile."
  37.  
  38.         # Reading size of old swapfile
  39.         if [ -e "${_SWAP_DIRECTORY}/${_SWAP_FILE}" ]
  40.         then
  41.             _SWAP_FILESIZE="$(ls -hl ${_SWAP_DIRECTORY}/${_SWAP_FILE} | awk '{ print $5 }')"
  42.  
  43.             echo "Found ${_SWAP_FILESIZE} MB swapfile."
  44.         fi
  45.  
  46.         # Creating new swap file
  47.         if [ "${_SWAP_FILESIZE}" != "${_SWAP_SIZE_MB}M" ]
  48.         then
  49.             if [ "${_FORCE}" = "true" ]
  50.             then
  51.                 # Removing old swapfile
  52.                 rm -f "${_SWAP_DIRECTORY}/${_SWAP_FILE}"
  53.  
  54.                 echo "Creating ${_SWAP_SIZE_MB} MB swapfile."
  55.  
  56.                 mkdir -p "${_SWAP_DIRECTORY}"
  57.  
  58.                 # Unfortunately, swapon does not support files
  59.                 # with holes, therefore we cannot preallocate.
  60.                 dd if=/dev/zero of="${_SWAP_DIRECTORY}/${_SWAP_FILE}"  bs=1024k count="${_SWAP_SIZE_MB}"
  61.             else
  62.                 echo "Exit."
  63.                 return 1
  64.             fi
  65.         fi
  66.  
  67.         echo "Enabling ${_SWAP_DIRECTORY}/${_SWAP_FILE}."
  68.  
  69.         mkswap "${_SWAP_DIRECTORY}/${_SWAP_FILE}"
  70.         swapon "${_SWAP_DIRECTORY}/${_SWAP_FILE}"
  71.         ;;
  72.  
  73.     rm|remove)
  74.         if grep -qs "${_SWAP_DIRECTORY}/${_SWAP_FILE}" /proc/swaps
  75.         then
  76.             echo "Disabling ${_SWAP_DIRECTORY}/${_SWAP_FILE}."
  77.  
  78.             swapoff "${_SWAP_DIRECTORY}/${_SWAP_FILE}"
  79.         fi
  80.  
  81.         if [ "${_SWAP_PURGE}" = "true" ]
  82.         then
  83.             echo "Removing ${_SWAP_DIRECTORY}/${_SWAP_FILE}."
  84.  
  85.             rm -f "${_SWAP_DIRECTORY}/${_SWAP_FILE}"
  86.  
  87.             __DIRECTORY="${_SWAP_DIRECTORY}"
  88.             while [ "${__DIRECTORY}" != "/" ]
  89.             do
  90.                 rmdir --ignore-fail-on-non-empty "${__DIRECTORY}"
  91.                 __DIRECTORY="$(dirname ${__DIRECTORY})"
  92.             done
  93.         fi
  94.         ;;
  95.  
  96.     *)
  97.         echo "Usage: ${0} {add|remove}"
  98.         exit 1
  99.         ;;
  100. esac
  101.