hibernate-script/hibernate.rc

   1 #!/bin/sh
   2
   3 . /etc/rc.conf
   4 . /etc/rc.d/functions
   5
   6 # This script invalidates any stale swsusp and Software Suspend 2 images. It
   7 # searches all swap partitions on your machine, as well as Suspend2's
   8 # filewriter files (by way of the hibernate script telling it where to find
   9 # it).
  10 #
  11 # It should be called on boot, after mounting filesystems, but before enabling
  12 # swap or clearing out /var/run. Copy this into /etc/init.d/ (or the appropriate
  13 # place on your system), then add a symlink at the appropriate point on boot.
  14 # On a Debian system, you would do this:
  15 #   update-rc.d hibernate-cleanup.sh start 31 S .
  16 #
  17 # On other SysV-based systems, you would do something like:
  18 #   ln -s ../init.d/hibernate-cleanup.sh /etc/rcS.d/S31hibernate-cleanup.sh
  19
  20 HIBERNATE_FILEWRITER_TRAIL="/var/run/suspend2_filewriter_image_exists"
  21
  22 clear_swap() {
  23         local where wason
  24         where=$1
  25         wason=
  26         swapoff $where 2>/dev/null && wason=yes
  27         mkswap $where > /dev/null || stat_append " (failed: $?)"
  28         [ -n "$wason" ] && swapon $where
  29 }
  30
  31 check_swap_sig() {
  32         local where what type rest p c
  33         while read  where what type rest ; do
  34                 test "$type" = "swap" || continue
  35                 case "$(dd if=$where bs=1 count=6 skip=4086 2>/dev/null)" in
  36                         S1SUSP|S2SUSP|ULSUSP|pmdisk|[zZ]*)
  37                                 stat_append "$where"
  38                                 clear_swap $where
  39                                 stat_append ", "
  40                 esac
  41         done < /etc/fstab
  42 }
  43
  44 check_filewriter_sig() {
  45         local target
  46         [ -f "$HIBERNATE_FILEWRITER_TRAIL" ] || return 0
  47         read target < $HIBERNATE_FILEWRITER_TRAIL
  48         [ -f "$target" ] || return
  49         case "`dd \"if=$target\" bs=8 count=1 2>/dev/null`" in
  50                 HaveImag)
  51                         /bin/echo -ne "Suspend2\n\0\0" | dd "of=$target" bs=11 count=1 conv=notrunc 2>/dev/null
  52                         stat_append -n "$target, "
  53                         rm -f $HIBERNATE_FILEWRITER_TRAIL
  54         esac
  55 }
  56
  57 case "$1" in
  58 start)
  59         stat_busy "Invalidating stale software suspend images... "
  60         check_swap_sig
  61         check_filewriter_sig
  62         stat_done
  63         ;;
  64 stop)
  65         ;;
  66 *)
  67         echo "Usage: $0 {start|stop}"
  68 esac