#!/bin/sh
# vim: noexpandtab
# Simple suspend script
#
# Copyright 2006 Red Hat, Inc.
#
# Based on work from:
#    Bill Nottingham <notting@redhat.com>
#    Peter Jones <pjones@redhat.com>
#    David Zeuthen <davidz@redhat.com>
#    Richard Hughes <richard@hughsie.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# The rule here? Simplicity.
export STASHNAME=pm-suspend
export METHOD="$(echo ${0##*pm-} |tr - _)"
. "@PM-UTILS-LIBDIR@/pm-functions"

# return code tracking for when suspend fails
r=0

help()
{
	echo "${0##*/} [options]"
	echo
	echo "Options can change how suspend or hibernate is done."
	run_hooks sleep help
	sleep_module_help
	exit 0
}

if [ "$(id -u)" != "0" ]; then
	echo This utility may only be run by the root user. 1>&2
	exit 1
fi

remove_suspend_lock()
{
	release_lock "${STASHNAME}.lock"
}

try_lock "${STASHNAME}.lock" || exit 1

# make sure we release the lock no matter how we exit
trap remove_suspend_lock 0

# clean up from the last run
rm -rf "${STORAGEDIR}"
mkdir -p "${STORAGEDIR}"
# save our parameter list.
[ -f "$PARAMETERS" ] || echo '' >"$PARAMETERS"
add_parameters $PM_CMDLINE
update_parameters

while [ $# -gt 0 ]
do
	[ "$1" = "--help" ] && help
	shift
done


command_exists "check_$METHOD" && command_exists "do_$METHOD" || {
	log "pm-utils does not know how to $METHOD on this system."
	exit 1
}

"check_$METHOD" || {
	log "This system does not support $METHOD as a sleep method."
	exit 1
}

case "$METHOD" in
	suspend*) 	ACTION=suspend;   REVERSE=resume ;;
	hibernate) 	ACTION=hibernate; REVERSE=thaw ;;
	*)		echo "Cannot happen.  Please file a bug against pm-utils."
			exit 1 ;;
esac

init_logfile "${PM_LOGFILE}"
log "Initial commandline parameters: $PM_CMDLINE"
load_hook_blacklist
load_hook_parameters

# run the sleep hooks
log "$(date): Running hooks for $ACTION."
if run_hooks sleep "$ACTION $METHOD"; then
        # Sleep only if we know how and if a hook did not inhibit us.
	log "$(date): performing $METHOD"
	sync
	"do_$METHOD" || r=128
	log "$(date): Awake."
else
	log "$(date): Inhibit found, will not perform $METHOD"
fi
log "$(date): Running hooks for $REVERSE"
# run the sleep hooks in reverse with the wakeup action
if run_hooks sleep "$REVERSE $METHOD" reverse; then
        log "$(date): Finished."
else 
        exit $((r+1))
fi
exit $r
