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|
#!/bin/sh
# This script invalidates any stale swsusp and Software Suspend 2 images. It
# searches all swap partitions on your machine, as well as Suspend2's
# filewriter files (by way of the hibernate script telling it where to find
# it).
#
# It should be called on boot, after mounting filesystems, but before enabling
# swap or clearing out /var/run. Copy this into /etc/init.d/ (or the appropriate
# place on your system), then add a symlink at the appropriate point on boot.
# On a Debian system, you would do this:
# update-rc.d hibernate-cleanup.sh start 31 S .
#
# On other SysV-based systems, you would do something like:
# ln -s ../init.d/hibernate-cleanup.sh /etc/rcS.d/S31hibernate-cleanup.sh
#
### BEGIN INIT INFO
# Provides: hibernate-cleanup
# Default-Start: S
# Default-Stop:
# Required-Start:
# Required-Stop:
# Short-Description: invalidates stale swsusp and Software Suspend 2 image
# Description: This script invalidates any stale swsusp and Software Suspend 2 images. It
# searches all swap partitions on your machine, as well as
# Suspend2's filewriter files (by way of the hibernate
# script telling it where to find it).
### END INIT INFO
HIBERNATE_FILEWRITER_TRAIL="/var/run/suspend2_filewriter_image_exists"
clear_swap() {
local where wason
where=$1
wason=
swapoff $where 2>/dev/null && wason=yes
mkswap $where > /dev/null || msg_status " (failed: $?)"
[ -n "$wason" ] && swapon $where
}
check_swap_sig() {
local where what type rest p c
while read where what type rest ; do
test "$type" = "swap" || continue
case "$(dd if=$where bs=1 count=6 skip=4086 2>/dev/null)" in
S1SUSP|S2SUSP|ULSUSP|pmdisk|[zZ]*)
msg_status "$where"
clear_swap $where
msg_status ", "
esac
done < /etc/fstab
}
check_filewriter_sig() {
local target
[ -f "$HIBERNATE_FILEWRITER_TRAIL" ] || return 0
read target < $HIBERNATE_FILEWRITER_TRAIL
[ -f "$target" ] || return
case "`dd \"if=$target\" bs=8 count=1 2>/dev/null`" in
HaveImag)
/bin/echo -ne "Suspend2\n\0\0" | dd "of=$target" bs=11 count=1 conv=notrunc 2>/dev/null
msg_status -n "$target, "
rm -f $HIBERNATE_FILEWRITER_TRAIL
esac
}
do_start() {
check_swap_sig
check_filewriter_sig
}
do_stop() {
:
}
do_reload() {
:
}
msg_status() {
echo -n "$1"
}
msg() {
echo "$1"
}
case "$1" in
start)
msg_status "Invalidating stale software suspend images... "
do_start
msg "done."
;;
stop)
do_stop
;;
restart|force-reload)
do_reload
;;
*)
msg "Usage: /etc/init.d/hibernate {start|stop|restart|force-reload}"
esac
exit 0
|
