#!/bin/sh

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
	prereqs
	exit 0
	;;
esac

if [ -z "${resume?}" ] || [ ! -e /sys/power/resume ]; then
	exit 0
fi

. /scripts/functions
. /scripts/local

PAGE_SIZE=4096
if [ -x /bin/getconf ]; then
	PAGE_SIZE=$(getconf PAGESIZE)
fi
export PAGE_SIZE

if ! local_device_setup "${resume}" "suspend/resume device" false; then
	exit 0
fi

DEV=$(readlink -f "$resume")
DEV=/sys/class/block/${DEV##*/}/dev
if [ -r "$DEV" ]; then
        read -r MAJMIN < "$DEV"
fi
if [ -z "$MAJMIN" ]; then
        exit 1
fi

if [ "${resume_offset?}" -ge 0 ] 2>/dev/null; then
	offset_option=$((${resume_offset?} * PAGE_SIZE))
	SWAPTYPE=$(blkid -p -O ${offset_option} "${resume}" -s TYPE -o value)
	MAJMIN="${MAJMIN}:${resume_offset?}"
else
	SWAPTYPE=$(blkid -p -o value -s TYPE "$resume")
fi

use_plymouth=false
if command -v plymouth >/dev/null && plymouth --ping; then
	use_plymouth=true
fi

case "${SWAPTYPE}" in
    swsuspend|s1suspend|s2suspend|ulsuspend|tuxonice)
	if "$use_plymouth"; then
		plymouth message --text="Resuming from $resume"

		# The above command does not wait for a framebuffer update to
		# complete, so the kernel can freeze the framebuffer before
		# the message is even visible.  Wait just a moment to make
		# that less likely.
		sleep 0.1
	fi
	;;
    swap)
	# Valid swap partition, but no resume image.
	;;
    *)
	# Not a valid swap partition. Ignoring it.
	exit 0
	;;
esac

echo "${MAJMIN}" > /sys/power/resume

if "$use_plymouth"; then
	# plymouth hide-message does not work yet
	plymouth display-message --text=""
fi